Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
5995477a | 56 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 57 | #include <linux/init.h> |
16f7e0fe | 58 | #include <linux/capability.h> |
1da177e4 | 59 | #include <linux/file.h> |
9f3acc31 | 60 | #include <linux/fdtable.h> |
1da177e4 LT |
61 | #include <linux/string.h> |
62 | #include <linux/seq_file.h> | |
63 | #include <linux/namei.h> | |
6b3286ed | 64 | #include <linux/mnt_namespace.h> |
1da177e4 | 65 | #include <linux/mm.h> |
a63d83f4 | 66 | #include <linux/swap.h> |
b835996f | 67 | #include <linux/rcupdate.h> |
1da177e4 | 68 | #include <linux/kallsyms.h> |
2ec220e2 | 69 | #include <linux/stacktrace.h> |
d85f50d5 | 70 | #include <linux/resource.h> |
5096add8 | 71 | #include <linux/module.h> |
1da177e4 LT |
72 | #include <linux/mount.h> |
73 | #include <linux/security.h> | |
74 | #include <linux/ptrace.h> | |
0d094efe | 75 | #include <linux/tracehook.h> |
87ebdc00 | 76 | #include <linux/printk.h> |
a424316c | 77 | #include <linux/cgroup.h> |
1da177e4 LT |
78 | #include <linux/cpuset.h> |
79 | #include <linux/audit.h> | |
5addc5dd | 80 | #include <linux/poll.h> |
1651e14e | 81 | #include <linux/nsproxy.h> |
8ac773b4 | 82 | #include <linux/oom.h> |
3cb4a0bb | 83 | #include <linux/elf.h> |
60347f67 | 84 | #include <linux/pid_namespace.h> |
22d917d8 | 85 | #include <linux/user_namespace.h> |
5ad4e53b | 86 | #include <linux/fs_struct.h> |
5a0e3ad6 | 87 | #include <linux/slab.h> |
640708a2 | 88 | #include <linux/flex_array.h> |
48f6a7a5 | 89 | #include <linux/posix-timers.h> |
f133ecca CM |
90 | #ifdef CONFIG_HARDWALL |
91 | #include <asm/hardwall.h> | |
92 | #endif | |
43d2b113 | 93 | #include <trace/events/oom.h> |
1da177e4 | 94 | #include "internal.h" |
faf60af1 | 95 | #include "fd.h" |
1da177e4 | 96 | |
0f2fe20f EB |
97 | /* NOTE: |
98 | * Implementing inode permission operations in /proc is almost | |
99 | * certainly an error. Permission checks need to happen during | |
100 | * each system call not at open time. The reason is that most of | |
101 | * what we wish to check for permissions in /proc varies at runtime. | |
102 | * | |
103 | * The classic example of a problem is opening file descriptors | |
104 | * in /proc for a task before it execs a suid executable. | |
105 | */ | |
106 | ||
1da177e4 | 107 | struct pid_entry { |
cedbccab | 108 | const char *name; |
c5141e6d | 109 | int len; |
d161a13f | 110 | umode_t mode; |
c5ef1c42 | 111 | const struct inode_operations *iop; |
00977a59 | 112 | const struct file_operations *fop; |
20cdc894 | 113 | union proc_op op; |
1da177e4 LT |
114 | }; |
115 | ||
61a28784 | 116 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 117 | .name = (NAME), \ |
c5141e6d | 118 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
119 | .mode = MODE, \ |
120 | .iop = IOP, \ | |
121 | .fop = FOP, \ | |
122 | .op = OP, \ | |
123 | } | |
124 | ||
631f9c18 AD |
125 | #define DIR(NAME, MODE, iops, fops) \ |
126 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
127 | #define LNK(NAME, get_link) \ | |
61a28784 | 128 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 129 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
130 | { .proc_get_link = get_link } ) |
131 | #define REG(NAME, MODE, fops) \ | |
132 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
631f9c18 | 133 | #define ONE(NAME, MODE, show) \ |
be614086 EB |
134 | NOD(NAME, (S_IFREG|(MODE)), \ |
135 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 136 | { .proc_show = show } ) |
1da177e4 | 137 | |
aed54175 VN |
138 | /* |
139 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
140 | * and .. links. | |
141 | */ | |
142 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, | |
143 | unsigned int n) | |
144 | { | |
145 | unsigned int i; | |
146 | unsigned int count; | |
147 | ||
148 | count = 0; | |
149 | for (i = 0; i < n; ++i) { | |
150 | if (S_ISDIR(entries[i].mode)) | |
151 | ++count; | |
152 | } | |
153 | ||
154 | return count; | |
155 | } | |
156 | ||
f7ad3c6b | 157 | static int get_task_root(struct task_struct *task, struct path *root) |
1da177e4 | 158 | { |
7c2c7d99 HD |
159 | int result = -ENOENT; |
160 | ||
0494f6ec | 161 | task_lock(task); |
f7ad3c6b MS |
162 | if (task->fs) { |
163 | get_fs_root(task->fs, root); | |
7c2c7d99 HD |
164 | result = 0; |
165 | } | |
0494f6ec | 166 | task_unlock(task); |
7c2c7d99 | 167 | return result; |
0494f6ec MS |
168 | } |
169 | ||
7773fbc5 | 170 | static int proc_cwd_link(struct dentry *dentry, struct path *path) |
0494f6ec | 171 | { |
7773fbc5 | 172 | struct task_struct *task = get_proc_task(dentry->d_inode); |
0494f6ec | 173 | int result = -ENOENT; |
99f89551 EB |
174 | |
175 | if (task) { | |
f7ad3c6b MS |
176 | task_lock(task); |
177 | if (task->fs) { | |
178 | get_fs_pwd(task->fs, path); | |
179 | result = 0; | |
180 | } | |
181 | task_unlock(task); | |
99f89551 EB |
182 | put_task_struct(task); |
183 | } | |
1da177e4 LT |
184 | return result; |
185 | } | |
186 | ||
7773fbc5 | 187 | static int proc_root_link(struct dentry *dentry, struct path *path) |
1da177e4 | 188 | { |
7773fbc5 | 189 | struct task_struct *task = get_proc_task(dentry->d_inode); |
1da177e4 | 190 | int result = -ENOENT; |
99f89551 EB |
191 | |
192 | if (task) { | |
f7ad3c6b | 193 | result = get_task_root(task, path); |
99f89551 EB |
194 | put_task_struct(task); |
195 | } | |
1da177e4 LT |
196 | return result; |
197 | } | |
198 | ||
2ca66ff7 AD |
199 | static int proc_pid_cmdline(struct seq_file *m, struct pid_namespace *ns, |
200 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 201 | { |
2ca66ff7 AD |
202 | /* |
203 | * Rely on struct seq_operations::show() being called once | |
204 | * per internal buffer allocation. See single_open(), traverse(). | |
205 | */ | |
206 | BUG_ON(m->size < PAGE_SIZE); | |
207 | m->count += get_cmdline(task, m->buf, PAGE_SIZE); | |
208 | return 0; | |
1da177e4 LT |
209 | } |
210 | ||
f9ea536e AD |
211 | static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns, |
212 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 213 | { |
e7dcd999 | 214 | struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ); |
2fadaef4 | 215 | if (mm && !IS_ERR(mm)) { |
1da177e4 | 216 | unsigned int nwords = 0; |
dfe6b7d9 | 217 | do { |
1da177e4 | 218 | nwords += 2; |
dfe6b7d9 | 219 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
f9ea536e | 220 | seq_write(m, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0])); |
1da177e4 | 221 | mmput(mm); |
f9ea536e AD |
222 | return 0; |
223 | } else | |
224 | return PTR_ERR(mm); | |
1da177e4 LT |
225 | } |
226 | ||
227 | ||
228 | #ifdef CONFIG_KALLSYMS | |
229 | /* | |
230 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
231 | * Returns the resolved symbol. If that fails, simply return the address. | |
232 | */ | |
edfcd606 AD |
233 | static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns, |
234 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 235 | { |
ffb45122 | 236 | unsigned long wchan; |
9281acea | 237 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
238 | |
239 | wchan = get_wchan(task); | |
240 | ||
9d65cb4a | 241 | if (lookup_symbol_name(wchan, symname) < 0) |
f83ce3e6 JE |
242 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
243 | return 0; | |
244 | else | |
edfcd606 | 245 | return seq_printf(m, "%lu", wchan); |
9d65cb4a | 246 | else |
edfcd606 | 247 | return seq_printf(m, "%s", symname); |
1da177e4 LT |
248 | } |
249 | #endif /* CONFIG_KALLSYMS */ | |
250 | ||
a9712bc1 AV |
251 | static int lock_trace(struct task_struct *task) |
252 | { | |
253 | int err = mutex_lock_killable(&task->signal->cred_guard_mutex); | |
254 | if (err) | |
255 | return err; | |
256 | if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) { | |
257 | mutex_unlock(&task->signal->cred_guard_mutex); | |
258 | return -EPERM; | |
259 | } | |
260 | return 0; | |
261 | } | |
262 | ||
263 | static void unlock_trace(struct task_struct *task) | |
264 | { | |
265 | mutex_unlock(&task->signal->cred_guard_mutex); | |
266 | } | |
267 | ||
2ec220e2 KC |
268 | #ifdef CONFIG_STACKTRACE |
269 | ||
270 | #define MAX_STACK_TRACE_DEPTH 64 | |
271 | ||
272 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
273 | struct pid *pid, struct task_struct *task) | |
274 | { | |
275 | struct stack_trace trace; | |
276 | unsigned long *entries; | |
a9712bc1 | 277 | int err; |
2ec220e2 KC |
278 | int i; |
279 | ||
280 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
281 | if (!entries) | |
282 | return -ENOMEM; | |
283 | ||
284 | trace.nr_entries = 0; | |
285 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
286 | trace.entries = entries; | |
287 | trace.skip = 0; | |
2ec220e2 | 288 | |
a9712bc1 AV |
289 | err = lock_trace(task); |
290 | if (!err) { | |
291 | save_stack_trace_tsk(task, &trace); | |
292 | ||
293 | for (i = 0; i < trace.nr_entries; i++) { | |
b81a618d | 294 | seq_printf(m, "[<%pK>] %pS\n", |
a9712bc1 AV |
295 | (void *)entries[i], (void *)entries[i]); |
296 | } | |
297 | unlock_trace(task); | |
2ec220e2 KC |
298 | } |
299 | kfree(entries); | |
300 | ||
a9712bc1 | 301 | return err; |
2ec220e2 KC |
302 | } |
303 | #endif | |
304 | ||
1da177e4 LT |
305 | #ifdef CONFIG_SCHEDSTATS |
306 | /* | |
307 | * Provides /proc/PID/schedstat | |
308 | */ | |
f6e826ca AD |
309 | static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns, |
310 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 311 | { |
f6e826ca | 312 | return seq_printf(m, "%llu %llu %lu\n", |
826e08b0 IM |
313 | (unsigned long long)task->se.sum_exec_runtime, |
314 | (unsigned long long)task->sched_info.run_delay, | |
2d72376b | 315 | task->sched_info.pcount); |
1da177e4 LT |
316 | } |
317 | #endif | |
318 | ||
9745512c AV |
319 | #ifdef CONFIG_LATENCYTOP |
320 | static int lstats_show_proc(struct seq_file *m, void *v) | |
321 | { | |
322 | int i; | |
13d77c37 HS |
323 | struct inode *inode = m->private; |
324 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 325 | |
13d77c37 HS |
326 | if (!task) |
327 | return -ESRCH; | |
328 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c | 329 | for (i = 0; i < 32; i++) { |
34e49d4f JP |
330 | struct latency_record *lr = &task->latency_record[i]; |
331 | if (lr->backtrace[0]) { | |
9745512c | 332 | int q; |
34e49d4f JP |
333 | seq_printf(m, "%i %li %li", |
334 | lr->count, lr->time, lr->max); | |
9745512c | 335 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
34e49d4f JP |
336 | unsigned long bt = lr->backtrace[q]; |
337 | if (!bt) | |
9745512c | 338 | break; |
34e49d4f | 339 | if (bt == ULONG_MAX) |
9745512c | 340 | break; |
34e49d4f | 341 | seq_printf(m, " %ps", (void *)bt); |
9745512c | 342 | } |
9d6de12f | 343 | seq_putc(m, '\n'); |
9745512c AV |
344 | } |
345 | ||
346 | } | |
13d77c37 | 347 | put_task_struct(task); |
9745512c AV |
348 | return 0; |
349 | } | |
350 | ||
351 | static int lstats_open(struct inode *inode, struct file *file) | |
352 | { | |
13d77c37 | 353 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
354 | } |
355 | ||
9745512c AV |
356 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
357 | size_t count, loff_t *offs) | |
358 | { | |
496ad9aa | 359 | struct task_struct *task = get_proc_task(file_inode(file)); |
9745512c | 360 | |
13d77c37 HS |
361 | if (!task) |
362 | return -ESRCH; | |
9745512c | 363 | clear_all_latency_tracing(task); |
13d77c37 | 364 | put_task_struct(task); |
9745512c AV |
365 | |
366 | return count; | |
367 | } | |
368 | ||
369 | static const struct file_operations proc_lstats_operations = { | |
370 | .open = lstats_open, | |
371 | .read = seq_read, | |
372 | .write = lstats_write, | |
373 | .llseek = seq_lseek, | |
13d77c37 | 374 | .release = single_release, |
9745512c AV |
375 | }; |
376 | ||
377 | #endif | |
378 | ||
6ba51e37 AD |
379 | static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, |
380 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 381 | { |
a7f638f9 | 382 | unsigned long totalpages = totalram_pages + total_swap_pages; |
b95c35e7 | 383 | unsigned long points = 0; |
1da177e4 | 384 | |
19c5d45a | 385 | read_lock(&tasklist_lock); |
b95c35e7 | 386 | if (pid_alive(task)) |
a7f638f9 DR |
387 | points = oom_badness(task, NULL, NULL, totalpages) * |
388 | 1000 / totalpages; | |
19c5d45a | 389 | read_unlock(&tasklist_lock); |
6ba51e37 | 390 | return seq_printf(m, "%lu\n", points); |
1da177e4 LT |
391 | } |
392 | ||
d85f50d5 | 393 | struct limit_names { |
cedbccab AD |
394 | const char *name; |
395 | const char *unit; | |
d85f50d5 NH |
396 | }; |
397 | ||
398 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 399 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
400 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
401 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
402 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
403 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
404 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
405 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
406 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
407 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
408 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
409 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
410 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
411 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
412 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
413 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 414 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
415 | }; |
416 | ||
417 | /* Display limits for a process */ | |
1c963eb1 AD |
418 | static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns, |
419 | struct pid *pid, struct task_struct *task) | |
d85f50d5 NH |
420 | { |
421 | unsigned int i; | |
d85f50d5 | 422 | unsigned long flags; |
d85f50d5 NH |
423 | |
424 | struct rlimit rlim[RLIM_NLIMITS]; | |
425 | ||
a6bebbc8 | 426 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 427 | return 0; |
d85f50d5 NH |
428 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
429 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
430 | |
431 | /* | |
432 | * print the file header | |
433 | */ | |
1c963eb1 | 434 | seq_printf(m, "%-25s %-20s %-20s %-10s\n", |
d85f50d5 NH |
435 | "Limit", "Soft Limit", "Hard Limit", "Units"); |
436 | ||
437 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
438 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
1c963eb1 | 439 | seq_printf(m, "%-25s %-20s ", |
d85f50d5 NH |
440 | lnames[i].name, "unlimited"); |
441 | else | |
1c963eb1 | 442 | seq_printf(m, "%-25s %-20lu ", |
d85f50d5 NH |
443 | lnames[i].name, rlim[i].rlim_cur); |
444 | ||
445 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
1c963eb1 | 446 | seq_printf(m, "%-20s ", "unlimited"); |
d85f50d5 | 447 | else |
1c963eb1 | 448 | seq_printf(m, "%-20lu ", rlim[i].rlim_max); |
d85f50d5 NH |
449 | |
450 | if (lnames[i].unit) | |
1c963eb1 | 451 | seq_printf(m, "%-10s\n", lnames[i].unit); |
d85f50d5 | 452 | else |
1c963eb1 | 453 | seq_putc(m, '\n'); |
d85f50d5 NH |
454 | } |
455 | ||
1c963eb1 | 456 | return 0; |
d85f50d5 NH |
457 | } |
458 | ||
ebcb6734 | 459 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 AD |
460 | static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns, |
461 | struct pid *pid, struct task_struct *task) | |
ebcb6734 RM |
462 | { |
463 | long nr; | |
464 | unsigned long args[6], sp, pc; | |
a9712bc1 AV |
465 | int res = lock_trace(task); |
466 | if (res) | |
467 | return res; | |
ebcb6734 RM |
468 | |
469 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
09d93bd6 | 470 | seq_puts(m, "running\n"); |
a9712bc1 | 471 | else if (nr < 0) |
09d93bd6 | 472 | seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
a9712bc1 | 473 | else |
09d93bd6 | 474 | seq_printf(m, |
ebcb6734 RM |
475 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
476 | nr, | |
477 | args[0], args[1], args[2], args[3], args[4], args[5], | |
478 | sp, pc); | |
a9712bc1 AV |
479 | unlock_trace(task); |
480 | return res; | |
ebcb6734 RM |
481 | } |
482 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
483 | ||
1da177e4 LT |
484 | /************************************************************************/ |
485 | /* Here the fs part begins */ | |
486 | /************************************************************************/ | |
487 | ||
488 | /* permission checks */ | |
778c1144 | 489 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 490 | { |
778c1144 EB |
491 | struct task_struct *task; |
492 | int allowed = 0; | |
df26c40e EB |
493 | /* Allow access to a task's file descriptors if it is us or we |
494 | * may use ptrace attach to the process and find out that | |
495 | * information. | |
778c1144 EB |
496 | */ |
497 | task = get_proc_task(inode); | |
df26c40e | 498 | if (task) { |
006ebb40 | 499 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
778c1144 | 500 | put_task_struct(task); |
df26c40e | 501 | } |
778c1144 | 502 | return allowed; |
1da177e4 LT |
503 | } |
504 | ||
6b4e306a | 505 | int proc_setattr(struct dentry *dentry, struct iattr *attr) |
6d76fa58 LT |
506 | { |
507 | int error; | |
508 | struct inode *inode = dentry->d_inode; | |
509 | ||
510 | if (attr->ia_valid & ATTR_MODE) | |
511 | return -EPERM; | |
512 | ||
513 | error = inode_change_ok(inode, attr); | |
1025774c CH |
514 | if (error) |
515 | return error; | |
516 | ||
1025774c CH |
517 | setattr_copy(inode, attr); |
518 | mark_inode_dirty(inode); | |
519 | return 0; | |
6d76fa58 LT |
520 | } |
521 | ||
0499680a VK |
522 | /* |
523 | * May current process learn task's sched/cmdline info (for hide_pid_min=1) | |
524 | * or euid/egid (for hide_pid_min=2)? | |
525 | */ | |
526 | static bool has_pid_permissions(struct pid_namespace *pid, | |
527 | struct task_struct *task, | |
528 | int hide_pid_min) | |
529 | { | |
530 | if (pid->hide_pid < hide_pid_min) | |
531 | return true; | |
532 | if (in_group_p(pid->pid_gid)) | |
533 | return true; | |
534 | return ptrace_may_access(task, PTRACE_MODE_READ); | |
535 | } | |
536 | ||
537 | ||
538 | static int proc_pid_permission(struct inode *inode, int mask) | |
539 | { | |
540 | struct pid_namespace *pid = inode->i_sb->s_fs_info; | |
541 | struct task_struct *task; | |
542 | bool has_perms; | |
543 | ||
544 | task = get_proc_task(inode); | |
a2ef990a XF |
545 | if (!task) |
546 | return -ESRCH; | |
0499680a VK |
547 | has_perms = has_pid_permissions(pid, task, 1); |
548 | put_task_struct(task); | |
549 | ||
550 | if (!has_perms) { | |
551 | if (pid->hide_pid == 2) { | |
552 | /* | |
553 | * Let's make getdents(), stat(), and open() | |
554 | * consistent with each other. If a process | |
555 | * may not stat() a file, it shouldn't be seen | |
556 | * in procfs at all. | |
557 | */ | |
558 | return -ENOENT; | |
559 | } | |
560 | ||
561 | return -EPERM; | |
562 | } | |
563 | return generic_permission(inode, mask); | |
564 | } | |
565 | ||
566 | ||
567 | ||
c5ef1c42 | 568 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
569 | .setattr = proc_setattr, |
570 | }; | |
571 | ||
be614086 EB |
572 | static int proc_single_show(struct seq_file *m, void *v) |
573 | { | |
574 | struct inode *inode = m->private; | |
575 | struct pid_namespace *ns; | |
576 | struct pid *pid; | |
577 | struct task_struct *task; | |
578 | int ret; | |
579 | ||
580 | ns = inode->i_sb->s_fs_info; | |
581 | pid = proc_pid(inode); | |
582 | task = get_pid_task(pid, PIDTYPE_PID); | |
583 | if (!task) | |
584 | return -ESRCH; | |
585 | ||
586 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
587 | ||
588 | put_task_struct(task); | |
589 | return ret; | |
590 | } | |
591 | ||
592 | static int proc_single_open(struct inode *inode, struct file *filp) | |
593 | { | |
c6a34058 | 594 | return single_open(filp, proc_single_show, inode); |
be614086 EB |
595 | } |
596 | ||
597 | static const struct file_operations proc_single_file_operations = { | |
598 | .open = proc_single_open, | |
599 | .read = seq_read, | |
600 | .llseek = seq_lseek, | |
601 | .release = single_release, | |
602 | }; | |
603 | ||
5381e169 ON |
604 | |
605 | struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode) | |
1da177e4 | 606 | { |
5381e169 ON |
607 | struct task_struct *task = get_proc_task(inode); |
608 | struct mm_struct *mm = ERR_PTR(-ESRCH); | |
e268337d | 609 | |
5381e169 ON |
610 | if (task) { |
611 | mm = mm_access(task, mode); | |
612 | put_task_struct(task); | |
e268337d | 613 | |
5381e169 ON |
614 | if (!IS_ERR_OR_NULL(mm)) { |
615 | /* ensure this mm_struct can't be freed */ | |
616 | atomic_inc(&mm->mm_count); | |
617 | /* but do not pin its memory */ | |
618 | mmput(mm); | |
619 | } | |
620 | } | |
621 | ||
622 | return mm; | |
623 | } | |
624 | ||
625 | static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) | |
626 | { | |
627 | struct mm_struct *mm = proc_mem_open(inode, mode); | |
e268337d LT |
628 | |
629 | if (IS_ERR(mm)) | |
630 | return PTR_ERR(mm); | |
631 | ||
e268337d | 632 | file->private_data = mm; |
1da177e4 LT |
633 | return 0; |
634 | } | |
635 | ||
b409e578 CW |
636 | static int mem_open(struct inode *inode, struct file *file) |
637 | { | |
bc452b4b DH |
638 | int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); |
639 | ||
640 | /* OK to pass negative loff_t, we can catch out-of-range */ | |
641 | file->f_mode |= FMODE_UNSIGNED_OFFSET; | |
642 | ||
643 | return ret; | |
b409e578 CW |
644 | } |
645 | ||
572d34b9 ON |
646 | static ssize_t mem_rw(struct file *file, char __user *buf, |
647 | size_t count, loff_t *ppos, int write) | |
1da177e4 | 648 | { |
e268337d | 649 | struct mm_struct *mm = file->private_data; |
572d34b9 ON |
650 | unsigned long addr = *ppos; |
651 | ssize_t copied; | |
1da177e4 | 652 | char *page; |
1da177e4 | 653 | |
e268337d LT |
654 | if (!mm) |
655 | return 0; | |
99f89551 | 656 | |
30cd8903 KM |
657 | page = (char *)__get_free_page(GFP_TEMPORARY); |
658 | if (!page) | |
e268337d | 659 | return -ENOMEM; |
1da177e4 | 660 | |
f7ca54f4 | 661 | copied = 0; |
6d08f2c7 ON |
662 | if (!atomic_inc_not_zero(&mm->mm_users)) |
663 | goto free; | |
664 | ||
1da177e4 | 665 | while (count > 0) { |
572d34b9 | 666 | int this_len = min_t(int, count, PAGE_SIZE); |
1da177e4 | 667 | |
572d34b9 | 668 | if (write && copy_from_user(page, buf, this_len)) { |
1da177e4 LT |
669 | copied = -EFAULT; |
670 | break; | |
671 | } | |
572d34b9 ON |
672 | |
673 | this_len = access_remote_vm(mm, addr, page, this_len, write); | |
674 | if (!this_len) { | |
1da177e4 LT |
675 | if (!copied) |
676 | copied = -EIO; | |
677 | break; | |
678 | } | |
572d34b9 ON |
679 | |
680 | if (!write && copy_to_user(buf, page, this_len)) { | |
681 | copied = -EFAULT; | |
682 | break; | |
683 | } | |
684 | ||
685 | buf += this_len; | |
686 | addr += this_len; | |
687 | copied += this_len; | |
688 | count -= this_len; | |
1da177e4 | 689 | } |
572d34b9 | 690 | *ppos = addr; |
30cd8903 | 691 | |
6d08f2c7 ON |
692 | mmput(mm); |
693 | free: | |
30cd8903 | 694 | free_page((unsigned long) page); |
1da177e4 LT |
695 | return copied; |
696 | } | |
1da177e4 | 697 | |
572d34b9 ON |
698 | static ssize_t mem_read(struct file *file, char __user *buf, |
699 | size_t count, loff_t *ppos) | |
700 | { | |
701 | return mem_rw(file, buf, count, ppos, 0); | |
702 | } | |
703 | ||
704 | static ssize_t mem_write(struct file *file, const char __user *buf, | |
705 | size_t count, loff_t *ppos) | |
706 | { | |
707 | return mem_rw(file, (char __user*)buf, count, ppos, 1); | |
708 | } | |
709 | ||
85863e47 | 710 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
711 | { |
712 | switch (orig) { | |
713 | case 0: | |
714 | file->f_pos = offset; | |
715 | break; | |
716 | case 1: | |
717 | file->f_pos += offset; | |
718 | break; | |
719 | default: | |
720 | return -EINVAL; | |
721 | } | |
722 | force_successful_syscall_return(); | |
723 | return file->f_pos; | |
724 | } | |
725 | ||
e268337d LT |
726 | static int mem_release(struct inode *inode, struct file *file) |
727 | { | |
728 | struct mm_struct *mm = file->private_data; | |
71879d3c | 729 | if (mm) |
6d08f2c7 | 730 | mmdrop(mm); |
e268337d LT |
731 | return 0; |
732 | } | |
733 | ||
00977a59 | 734 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
735 | .llseek = mem_lseek, |
736 | .read = mem_read, | |
737 | .write = mem_write, | |
738 | .open = mem_open, | |
e268337d | 739 | .release = mem_release, |
1da177e4 LT |
740 | }; |
741 | ||
b409e578 CW |
742 | static int environ_open(struct inode *inode, struct file *file) |
743 | { | |
744 | return __mem_open(inode, file, PTRACE_MODE_READ); | |
745 | } | |
746 | ||
315e28c8 JP |
747 | static ssize_t environ_read(struct file *file, char __user *buf, |
748 | size_t count, loff_t *ppos) | |
749 | { | |
315e28c8 JP |
750 | char *page; |
751 | unsigned long src = *ppos; | |
b409e578 CW |
752 | int ret = 0; |
753 | struct mm_struct *mm = file->private_data; | |
315e28c8 | 754 | |
b409e578 CW |
755 | if (!mm) |
756 | return 0; | |
315e28c8 | 757 | |
315e28c8 JP |
758 | page = (char *)__get_free_page(GFP_TEMPORARY); |
759 | if (!page) | |
b409e578 | 760 | return -ENOMEM; |
315e28c8 | 761 | |
d6f64b89 | 762 | ret = 0; |
b409e578 CW |
763 | if (!atomic_inc_not_zero(&mm->mm_users)) |
764 | goto free; | |
315e28c8 | 765 | while (count > 0) { |
e8905ec2 DH |
766 | size_t this_len, max_len; |
767 | int retval; | |
315e28c8 | 768 | |
e8905ec2 | 769 | if (src >= (mm->env_end - mm->env_start)) |
315e28c8 JP |
770 | break; |
771 | ||
e8905ec2 DH |
772 | this_len = mm->env_end - (mm->env_start + src); |
773 | ||
774 | max_len = min_t(size_t, PAGE_SIZE, count); | |
775 | this_len = min(max_len, this_len); | |
315e28c8 | 776 | |
b409e578 | 777 | retval = access_remote_vm(mm, (mm->env_start + src), |
315e28c8 JP |
778 | page, this_len, 0); |
779 | ||
780 | if (retval <= 0) { | |
781 | ret = retval; | |
782 | break; | |
783 | } | |
784 | ||
785 | if (copy_to_user(buf, page, retval)) { | |
786 | ret = -EFAULT; | |
787 | break; | |
788 | } | |
789 | ||
790 | ret += retval; | |
791 | src += retval; | |
792 | buf += retval; | |
793 | count -= retval; | |
794 | } | |
795 | *ppos = src; | |
315e28c8 | 796 | mmput(mm); |
b409e578 CW |
797 | |
798 | free: | |
315e28c8 | 799 | free_page((unsigned long) page); |
315e28c8 JP |
800 | return ret; |
801 | } | |
802 | ||
803 | static const struct file_operations proc_environ_operations = { | |
b409e578 | 804 | .open = environ_open, |
315e28c8 | 805 | .read = environ_read, |
87df8424 | 806 | .llseek = generic_file_llseek, |
b409e578 | 807 | .release = mem_release, |
315e28c8 JP |
808 | }; |
809 | ||
fa0cbbf1 DR |
810 | static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, |
811 | loff_t *ppos) | |
812 | { | |
496ad9aa | 813 | struct task_struct *task = get_proc_task(file_inode(file)); |
fa0cbbf1 DR |
814 | char buffer[PROC_NUMBUF]; |
815 | int oom_adj = OOM_ADJUST_MIN; | |
816 | size_t len; | |
817 | unsigned long flags; | |
818 | ||
819 | if (!task) | |
820 | return -ESRCH; | |
821 | if (lock_task_sighand(task, &flags)) { | |
822 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) | |
823 | oom_adj = OOM_ADJUST_MAX; | |
824 | else | |
825 | oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / | |
826 | OOM_SCORE_ADJ_MAX; | |
827 | unlock_task_sighand(task, &flags); | |
828 | } | |
829 | put_task_struct(task); | |
830 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); | |
831 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
832 | } | |
833 | ||
834 | static ssize_t oom_adj_write(struct file *file, const char __user *buf, | |
835 | size_t count, loff_t *ppos) | |
836 | { | |
837 | struct task_struct *task; | |
838 | char buffer[PROC_NUMBUF]; | |
839 | int oom_adj; | |
840 | unsigned long flags; | |
841 | int err; | |
842 | ||
843 | memset(buffer, 0, sizeof(buffer)); | |
844 | if (count > sizeof(buffer) - 1) | |
845 | count = sizeof(buffer) - 1; | |
846 | if (copy_from_user(buffer, buf, count)) { | |
847 | err = -EFAULT; | |
848 | goto out; | |
849 | } | |
850 | ||
851 | err = kstrtoint(strstrip(buffer), 0, &oom_adj); | |
852 | if (err) | |
853 | goto out; | |
854 | if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && | |
855 | oom_adj != OOM_DISABLE) { | |
856 | err = -EINVAL; | |
857 | goto out; | |
858 | } | |
859 | ||
496ad9aa | 860 | task = get_proc_task(file_inode(file)); |
fa0cbbf1 DR |
861 | if (!task) { |
862 | err = -ESRCH; | |
863 | goto out; | |
864 | } | |
865 | ||
866 | task_lock(task); | |
867 | if (!task->mm) { | |
868 | err = -EINVAL; | |
869 | goto err_task_lock; | |
870 | } | |
871 | ||
872 | if (!lock_task_sighand(task, &flags)) { | |
873 | err = -ESRCH; | |
874 | goto err_task_lock; | |
875 | } | |
876 | ||
877 | /* | |
878 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
879 | * value is always attainable. | |
880 | */ | |
881 | if (oom_adj == OOM_ADJUST_MAX) | |
882 | oom_adj = OOM_SCORE_ADJ_MAX; | |
883 | else | |
884 | oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; | |
885 | ||
886 | if (oom_adj < task->signal->oom_score_adj && | |
887 | !capable(CAP_SYS_RESOURCE)) { | |
888 | err = -EACCES; | |
889 | goto err_sighand; | |
890 | } | |
891 | ||
892 | /* | |
893 | * /proc/pid/oom_adj is provided for legacy purposes, ask users to use | |
894 | * /proc/pid/oom_score_adj instead. | |
895 | */ | |
87ebdc00 | 896 | pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", |
fa0cbbf1 DR |
897 | current->comm, task_pid_nr(current), task_pid_nr(task), |
898 | task_pid_nr(task)); | |
899 | ||
900 | task->signal->oom_score_adj = oom_adj; | |
901 | trace_oom_score_adj_update(task); | |
902 | err_sighand: | |
903 | unlock_task_sighand(task, &flags); | |
904 | err_task_lock: | |
905 | task_unlock(task); | |
906 | put_task_struct(task); | |
907 | out: | |
908 | return err < 0 ? err : count; | |
909 | } | |
910 | ||
911 | static const struct file_operations proc_oom_adj_operations = { | |
912 | .read = oom_adj_read, | |
913 | .write = oom_adj_write, | |
914 | .llseek = generic_file_llseek, | |
915 | }; | |
916 | ||
a63d83f4 DR |
917 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
918 | size_t count, loff_t *ppos) | |
919 | { | |
496ad9aa | 920 | struct task_struct *task = get_proc_task(file_inode(file)); |
a63d83f4 | 921 | char buffer[PROC_NUMBUF]; |
a9c58b90 | 922 | short oom_score_adj = OOM_SCORE_ADJ_MIN; |
a63d83f4 DR |
923 | unsigned long flags; |
924 | size_t len; | |
925 | ||
926 | if (!task) | |
927 | return -ESRCH; | |
928 | if (lock_task_sighand(task, &flags)) { | |
929 | oom_score_adj = task->signal->oom_score_adj; | |
930 | unlock_task_sighand(task, &flags); | |
931 | } | |
932 | put_task_struct(task); | |
a9c58b90 | 933 | len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); |
a63d83f4 DR |
934 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
935 | } | |
936 | ||
937 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
938 | size_t count, loff_t *ppos) | |
939 | { | |
940 | struct task_struct *task; | |
941 | char buffer[PROC_NUMBUF]; | |
942 | unsigned long flags; | |
0a8cb8e3 | 943 | int oom_score_adj; |
a63d83f4 DR |
944 | int err; |
945 | ||
946 | memset(buffer, 0, sizeof(buffer)); | |
947 | if (count > sizeof(buffer) - 1) | |
948 | count = sizeof(buffer) - 1; | |
723548bf DR |
949 | if (copy_from_user(buffer, buf, count)) { |
950 | err = -EFAULT; | |
951 | goto out; | |
952 | } | |
a63d83f4 | 953 | |
0a8cb8e3 | 954 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
a63d83f4 | 955 | if (err) |
723548bf | 956 | goto out; |
a63d83f4 | 957 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
723548bf DR |
958 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
959 | err = -EINVAL; | |
960 | goto out; | |
961 | } | |
a63d83f4 | 962 | |
496ad9aa | 963 | task = get_proc_task(file_inode(file)); |
723548bf DR |
964 | if (!task) { |
965 | err = -ESRCH; | |
966 | goto out; | |
967 | } | |
d19d5476 DR |
968 | |
969 | task_lock(task); | |
970 | if (!task->mm) { | |
971 | err = -EINVAL; | |
972 | goto err_task_lock; | |
973 | } | |
974 | ||
a63d83f4 | 975 | if (!lock_task_sighand(task, &flags)) { |
723548bf | 976 | err = -ESRCH; |
d19d5476 | 977 | goto err_task_lock; |
a63d83f4 | 978 | } |
d19d5476 | 979 | |
a9c58b90 | 980 | if ((short)oom_score_adj < task->signal->oom_score_adj_min && |
a63d83f4 | 981 | !capable(CAP_SYS_RESOURCE)) { |
723548bf DR |
982 | err = -EACCES; |
983 | goto err_sighand; | |
a63d83f4 DR |
984 | } |
985 | ||
a9c58b90 | 986 | task->signal->oom_score_adj = (short)oom_score_adj; |
dabb16f6 | 987 | if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) |
a9c58b90 | 988 | task->signal->oom_score_adj_min = (short)oom_score_adj; |
43d2b113 | 989 | trace_oom_score_adj_update(task); |
01dc52eb | 990 | |
723548bf | 991 | err_sighand: |
a63d83f4 | 992 | unlock_task_sighand(task, &flags); |
d19d5476 DR |
993 | err_task_lock: |
994 | task_unlock(task); | |
a63d83f4 | 995 | put_task_struct(task); |
723548bf DR |
996 | out: |
997 | return err < 0 ? err : count; | |
a63d83f4 DR |
998 | } |
999 | ||
1000 | static const struct file_operations proc_oom_score_adj_operations = { | |
1001 | .read = oom_score_adj_read, | |
1002 | .write = oom_score_adj_write, | |
6038f373 | 1003 | .llseek = default_llseek, |
a63d83f4 DR |
1004 | }; |
1005 | ||
1da177e4 LT |
1006 | #ifdef CONFIG_AUDITSYSCALL |
1007 | #define TMPBUFLEN 21 | |
1008 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1009 | size_t count, loff_t *ppos) | |
1010 | { | |
496ad9aa | 1011 | struct inode * inode = file_inode(file); |
99f89551 | 1012 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1013 | ssize_t length; |
1014 | char tmpbuf[TMPBUFLEN]; | |
1015 | ||
99f89551 EB |
1016 | if (!task) |
1017 | return -ESRCH; | |
1da177e4 | 1018 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
e1760bd5 EB |
1019 | from_kuid(file->f_cred->user_ns, |
1020 | audit_get_loginuid(task))); | |
99f89551 | 1021 | put_task_struct(task); |
1da177e4 LT |
1022 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1023 | } | |
1024 | ||
1025 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1026 | size_t count, loff_t *ppos) | |
1027 | { | |
496ad9aa | 1028 | struct inode * inode = file_inode(file); |
1da177e4 LT |
1029 | char *page, *tmp; |
1030 | ssize_t length; | |
1da177e4 | 1031 | uid_t loginuid; |
e1760bd5 | 1032 | kuid_t kloginuid; |
1da177e4 | 1033 | |
7dc52157 PM |
1034 | rcu_read_lock(); |
1035 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1036 | rcu_read_unlock(); | |
1da177e4 | 1037 | return -EPERM; |
7dc52157 PM |
1038 | } |
1039 | rcu_read_unlock(); | |
1da177e4 | 1040 | |
e0182909 AV |
1041 | if (count >= PAGE_SIZE) |
1042 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1043 | |
1044 | if (*ppos != 0) { | |
1045 | /* No partial writes. */ | |
1046 | return -EINVAL; | |
1047 | } | |
e12ba74d | 1048 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1049 | if (!page) |
1050 | return -ENOMEM; | |
1051 | length = -EFAULT; | |
1052 | if (copy_from_user(page, buf, count)) | |
1053 | goto out_free_page; | |
1054 | ||
e0182909 | 1055 | page[count] = '\0'; |
1da177e4 LT |
1056 | loginuid = simple_strtoul(page, &tmp, 10); |
1057 | if (tmp == page) { | |
1058 | length = -EINVAL; | |
1059 | goto out_free_page; | |
1060 | ||
1061 | } | |
81407c84 EP |
1062 | |
1063 | /* is userspace tring to explicitly UNSET the loginuid? */ | |
1064 | if (loginuid == AUDIT_UID_UNSET) { | |
1065 | kloginuid = INVALID_UID; | |
1066 | } else { | |
1067 | kloginuid = make_kuid(file->f_cred->user_ns, loginuid); | |
1068 | if (!uid_valid(kloginuid)) { | |
1069 | length = -EINVAL; | |
1070 | goto out_free_page; | |
1071 | } | |
e1760bd5 EB |
1072 | } |
1073 | ||
1074 | length = audit_set_loginuid(kloginuid); | |
1da177e4 LT |
1075 | if (likely(length == 0)) |
1076 | length = count; | |
1077 | ||
1078 | out_free_page: | |
1079 | free_page((unsigned long) page); | |
1080 | return length; | |
1081 | } | |
1082 | ||
00977a59 | 1083 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1084 | .read = proc_loginuid_read, |
1085 | .write = proc_loginuid_write, | |
87df8424 | 1086 | .llseek = generic_file_llseek, |
1da177e4 | 1087 | }; |
1e0bd755 EP |
1088 | |
1089 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1090 | size_t count, loff_t *ppos) | |
1091 | { | |
496ad9aa | 1092 | struct inode * inode = file_inode(file); |
1e0bd755 EP |
1093 | struct task_struct *task = get_proc_task(inode); |
1094 | ssize_t length; | |
1095 | char tmpbuf[TMPBUFLEN]; | |
1096 | ||
1097 | if (!task) | |
1098 | return -ESRCH; | |
1099 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1100 | audit_get_sessionid(task)); | |
1101 | put_task_struct(task); | |
1102 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1103 | } | |
1104 | ||
1105 | static const struct file_operations proc_sessionid_operations = { | |
1106 | .read = proc_sessionid_read, | |
87df8424 | 1107 | .llseek = generic_file_llseek, |
1e0bd755 | 1108 | }; |
1da177e4 LT |
1109 | #endif |
1110 | ||
f4f154fd AM |
1111 | #ifdef CONFIG_FAULT_INJECTION |
1112 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1113 | size_t count, loff_t *ppos) | |
1114 | { | |
496ad9aa | 1115 | struct task_struct *task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1116 | char buffer[PROC_NUMBUF]; |
1117 | size_t len; | |
1118 | int make_it_fail; | |
f4f154fd AM |
1119 | |
1120 | if (!task) | |
1121 | return -ESRCH; | |
1122 | make_it_fail = task->make_it_fail; | |
1123 | put_task_struct(task); | |
1124 | ||
1125 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1126 | |
1127 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1128 | } |
1129 | ||
1130 | static ssize_t proc_fault_inject_write(struct file * file, | |
1131 | const char __user * buf, size_t count, loff_t *ppos) | |
1132 | { | |
1133 | struct task_struct *task; | |
1134 | char buffer[PROC_NUMBUF], *end; | |
1135 | int make_it_fail; | |
1136 | ||
1137 | if (!capable(CAP_SYS_RESOURCE)) | |
1138 | return -EPERM; | |
1139 | memset(buffer, 0, sizeof(buffer)); | |
1140 | if (count > sizeof(buffer) - 1) | |
1141 | count = sizeof(buffer) - 1; | |
1142 | if (copy_from_user(buffer, buf, count)) | |
1143 | return -EFAULT; | |
cba8aafe VL |
1144 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
1145 | if (*end) | |
1146 | return -EINVAL; | |
16caed31 DJ |
1147 | if (make_it_fail < 0 || make_it_fail > 1) |
1148 | return -EINVAL; | |
1149 | ||
496ad9aa | 1150 | task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1151 | if (!task) |
1152 | return -ESRCH; | |
1153 | task->make_it_fail = make_it_fail; | |
1154 | put_task_struct(task); | |
cba8aafe VL |
1155 | |
1156 | return count; | |
f4f154fd AM |
1157 | } |
1158 | ||
00977a59 | 1159 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1160 | .read = proc_fault_inject_read, |
1161 | .write = proc_fault_inject_write, | |
87df8424 | 1162 | .llseek = generic_file_llseek, |
f4f154fd AM |
1163 | }; |
1164 | #endif | |
1165 | ||
9745512c | 1166 | |
43ae34cb IM |
1167 | #ifdef CONFIG_SCHED_DEBUG |
1168 | /* | |
1169 | * Print out various scheduling related per-task fields: | |
1170 | */ | |
1171 | static int sched_show(struct seq_file *m, void *v) | |
1172 | { | |
1173 | struct inode *inode = m->private; | |
1174 | struct task_struct *p; | |
1175 | ||
43ae34cb IM |
1176 | p = get_proc_task(inode); |
1177 | if (!p) | |
1178 | return -ESRCH; | |
1179 | proc_sched_show_task(p, m); | |
1180 | ||
1181 | put_task_struct(p); | |
1182 | ||
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | static ssize_t | |
1187 | sched_write(struct file *file, const char __user *buf, | |
1188 | size_t count, loff_t *offset) | |
1189 | { | |
496ad9aa | 1190 | struct inode *inode = file_inode(file); |
43ae34cb IM |
1191 | struct task_struct *p; |
1192 | ||
43ae34cb IM |
1193 | p = get_proc_task(inode); |
1194 | if (!p) | |
1195 | return -ESRCH; | |
1196 | proc_sched_set_task(p); | |
1197 | ||
1198 | put_task_struct(p); | |
1199 | ||
1200 | return count; | |
1201 | } | |
1202 | ||
1203 | static int sched_open(struct inode *inode, struct file *filp) | |
1204 | { | |
c6a34058 | 1205 | return single_open(filp, sched_show, inode); |
43ae34cb IM |
1206 | } |
1207 | ||
1208 | static const struct file_operations proc_pid_sched_operations = { | |
1209 | .open = sched_open, | |
1210 | .read = seq_read, | |
1211 | .write = sched_write, | |
1212 | .llseek = seq_lseek, | |
5ea473a1 | 1213 | .release = single_release, |
43ae34cb IM |
1214 | }; |
1215 | ||
1216 | #endif | |
1217 | ||
5091faa4 MG |
1218 | #ifdef CONFIG_SCHED_AUTOGROUP |
1219 | /* | |
1220 | * Print out autogroup related information: | |
1221 | */ | |
1222 | static int sched_autogroup_show(struct seq_file *m, void *v) | |
1223 | { | |
1224 | struct inode *inode = m->private; | |
1225 | struct task_struct *p; | |
1226 | ||
1227 | p = get_proc_task(inode); | |
1228 | if (!p) | |
1229 | return -ESRCH; | |
1230 | proc_sched_autogroup_show_task(p, m); | |
1231 | ||
1232 | put_task_struct(p); | |
1233 | ||
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | static ssize_t | |
1238 | sched_autogroup_write(struct file *file, const char __user *buf, | |
1239 | size_t count, loff_t *offset) | |
1240 | { | |
496ad9aa | 1241 | struct inode *inode = file_inode(file); |
5091faa4 MG |
1242 | struct task_struct *p; |
1243 | char buffer[PROC_NUMBUF]; | |
0a8cb8e3 | 1244 | int nice; |
5091faa4 MG |
1245 | int err; |
1246 | ||
1247 | memset(buffer, 0, sizeof(buffer)); | |
1248 | if (count > sizeof(buffer) - 1) | |
1249 | count = sizeof(buffer) - 1; | |
1250 | if (copy_from_user(buffer, buf, count)) | |
1251 | return -EFAULT; | |
1252 | ||
0a8cb8e3 AD |
1253 | err = kstrtoint(strstrip(buffer), 0, &nice); |
1254 | if (err < 0) | |
1255 | return err; | |
5091faa4 MG |
1256 | |
1257 | p = get_proc_task(inode); | |
1258 | if (!p) | |
1259 | return -ESRCH; | |
1260 | ||
2e5b5b3a | 1261 | err = proc_sched_autogroup_set_nice(p, nice); |
5091faa4 MG |
1262 | if (err) |
1263 | count = err; | |
1264 | ||
1265 | put_task_struct(p); | |
1266 | ||
1267 | return count; | |
1268 | } | |
1269 | ||
1270 | static int sched_autogroup_open(struct inode *inode, struct file *filp) | |
1271 | { | |
1272 | int ret; | |
1273 | ||
1274 | ret = single_open(filp, sched_autogroup_show, NULL); | |
1275 | if (!ret) { | |
1276 | struct seq_file *m = filp->private_data; | |
1277 | ||
1278 | m->private = inode; | |
1279 | } | |
1280 | return ret; | |
1281 | } | |
1282 | ||
1283 | static const struct file_operations proc_pid_sched_autogroup_operations = { | |
1284 | .open = sched_autogroup_open, | |
1285 | .read = seq_read, | |
1286 | .write = sched_autogroup_write, | |
1287 | .llseek = seq_lseek, | |
1288 | .release = single_release, | |
1289 | }; | |
1290 | ||
1291 | #endif /* CONFIG_SCHED_AUTOGROUP */ | |
1292 | ||
4614a696 | 1293 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1294 | size_t count, loff_t *offset) | |
1295 | { | |
496ad9aa | 1296 | struct inode *inode = file_inode(file); |
4614a696 | 1297 | struct task_struct *p; |
1298 | char buffer[TASK_COMM_LEN]; | |
830e0fc9 | 1299 | const size_t maxlen = sizeof(buffer) - 1; |
4614a696 | 1300 | |
1301 | memset(buffer, 0, sizeof(buffer)); | |
830e0fc9 | 1302 | if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) |
4614a696 | 1303 | return -EFAULT; |
1304 | ||
1305 | p = get_proc_task(inode); | |
1306 | if (!p) | |
1307 | return -ESRCH; | |
1308 | ||
1309 | if (same_thread_group(current, p)) | |
1310 | set_task_comm(p, buffer); | |
1311 | else | |
1312 | count = -EINVAL; | |
1313 | ||
1314 | put_task_struct(p); | |
1315 | ||
1316 | return count; | |
1317 | } | |
1318 | ||
1319 | static int comm_show(struct seq_file *m, void *v) | |
1320 | { | |
1321 | struct inode *inode = m->private; | |
1322 | struct task_struct *p; | |
1323 | ||
1324 | p = get_proc_task(inode); | |
1325 | if (!p) | |
1326 | return -ESRCH; | |
1327 | ||
1328 | task_lock(p); | |
1329 | seq_printf(m, "%s\n", p->comm); | |
1330 | task_unlock(p); | |
1331 | ||
1332 | put_task_struct(p); | |
1333 | ||
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | static int comm_open(struct inode *inode, struct file *filp) | |
1338 | { | |
c6a34058 | 1339 | return single_open(filp, comm_show, inode); |
4614a696 | 1340 | } |
1341 | ||
1342 | static const struct file_operations proc_pid_set_comm_operations = { | |
1343 | .open = comm_open, | |
1344 | .read = seq_read, | |
1345 | .write = comm_write, | |
1346 | .llseek = seq_lseek, | |
1347 | .release = single_release, | |
1348 | }; | |
1349 | ||
7773fbc5 | 1350 | static int proc_exe_link(struct dentry *dentry, struct path *exe_path) |
925d1c40 MH |
1351 | { |
1352 | struct task_struct *task; | |
1353 | struct mm_struct *mm; | |
1354 | struct file *exe_file; | |
1355 | ||
7773fbc5 | 1356 | task = get_proc_task(dentry->d_inode); |
925d1c40 MH |
1357 | if (!task) |
1358 | return -ENOENT; | |
1359 | mm = get_task_mm(task); | |
1360 | put_task_struct(task); | |
1361 | if (!mm) | |
1362 | return -ENOENT; | |
1363 | exe_file = get_mm_exe_file(mm); | |
1364 | mmput(mm); | |
1365 | if (exe_file) { | |
1366 | *exe_path = exe_file->f_path; | |
1367 | path_get(&exe_file->f_path); | |
1368 | fput(exe_file); | |
1369 | return 0; | |
1370 | } else | |
1371 | return -ENOENT; | |
1372 | } | |
1373 | ||
008b150a | 1374 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1375 | { |
1376 | struct inode *inode = dentry->d_inode; | |
408ef013 | 1377 | struct path path; |
1da177e4 LT |
1378 | int error = -EACCES; |
1379 | ||
778c1144 EB |
1380 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1381 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1382 | goto out; |
1da177e4 | 1383 | |
408ef013 CH |
1384 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1385 | if (error) | |
1386 | goto out; | |
1387 | ||
b5fb63c1 | 1388 | nd_jump_link(nd, &path); |
408ef013 | 1389 | return NULL; |
1da177e4 | 1390 | out: |
008b150a | 1391 | return ERR_PTR(error); |
1da177e4 LT |
1392 | } |
1393 | ||
3dcd25f3 | 1394 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1395 | { |
e12ba74d | 1396 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1397 | char *pathname; |
1da177e4 LT |
1398 | int len; |
1399 | ||
1400 | if (!tmp) | |
1401 | return -ENOMEM; | |
0c28f287 | 1402 | |
7b2a69ba | 1403 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1404 | len = PTR_ERR(pathname); |
1405 | if (IS_ERR(pathname)) | |
1da177e4 | 1406 | goto out; |
3dcd25f3 | 1407 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1408 | |
1409 | if (len > buflen) | |
1410 | len = buflen; | |
3dcd25f3 | 1411 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1412 | len = -EFAULT; |
1413 | out: | |
1414 | free_page((unsigned long)tmp); | |
1415 | return len; | |
1416 | } | |
1417 | ||
1418 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1419 | { | |
1420 | int error = -EACCES; | |
1421 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1422 | struct path path; |
1da177e4 | 1423 | |
778c1144 EB |
1424 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1425 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1426 | goto out; |
1da177e4 | 1427 | |
7773fbc5 | 1428 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1da177e4 LT |
1429 | if (error) |
1430 | goto out; | |
1431 | ||
3dcd25f3 JB |
1432 | error = do_proc_readlink(&path, buffer, buflen); |
1433 | path_put(&path); | |
1da177e4 | 1434 | out: |
1da177e4 LT |
1435 | return error; |
1436 | } | |
1437 | ||
faf60af1 | 1438 | const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1439 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1440 | .follow_link = proc_pid_follow_link, |
1441 | .setattr = proc_setattr, | |
1da177e4 LT |
1442 | }; |
1443 | ||
28a6d671 EB |
1444 | |
1445 | /* building an inode */ | |
1446 | ||
6b4e306a | 1447 | struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1448 | { |
1449 | struct inode * inode; | |
1450 | struct proc_inode *ei; | |
c69e8d9c | 1451 | const struct cred *cred; |
1da177e4 | 1452 | |
28a6d671 | 1453 | /* We need a new inode */ |
1da177e4 | 1454 | |
28a6d671 EB |
1455 | inode = new_inode(sb); |
1456 | if (!inode) | |
1457 | goto out; | |
1458 | ||
1459 | /* Common stuff */ | |
1460 | ei = PROC_I(inode); | |
85fe4025 | 1461 | inode->i_ino = get_next_ino(); |
28a6d671 | 1462 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
28a6d671 EB |
1463 | inode->i_op = &proc_def_inode_operations; |
1464 | ||
1465 | /* | |
1466 | * grab the reference to task. | |
1467 | */ | |
1a657f78 | 1468 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1469 | if (!ei->pid) |
1470 | goto out_unlock; | |
1471 | ||
28a6d671 | 1472 | if (task_dumpable(task)) { |
c69e8d9c DH |
1473 | rcu_read_lock(); |
1474 | cred = __task_cred(task); | |
1475 | inode->i_uid = cred->euid; | |
1476 | inode->i_gid = cred->egid; | |
1477 | rcu_read_unlock(); | |
1da177e4 | 1478 | } |
28a6d671 EB |
1479 | security_task_to_inode(task, inode); |
1480 | ||
1da177e4 | 1481 | out: |
28a6d671 EB |
1482 | return inode; |
1483 | ||
1484 | out_unlock: | |
1485 | iput(inode); | |
1486 | return NULL; | |
1da177e4 LT |
1487 | } |
1488 | ||
6b4e306a | 1489 | int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1490 | { |
1da177e4 | 1491 | struct inode *inode = dentry->d_inode; |
28a6d671 | 1492 | struct task_struct *task; |
c69e8d9c | 1493 | const struct cred *cred; |
0499680a | 1494 | struct pid_namespace *pid = dentry->d_sb->s_fs_info; |
c69e8d9c | 1495 | |
28a6d671 | 1496 | generic_fillattr(inode, stat); |
1da177e4 | 1497 | |
28a6d671 | 1498 | rcu_read_lock(); |
dcb0f222 EB |
1499 | stat->uid = GLOBAL_ROOT_UID; |
1500 | stat->gid = GLOBAL_ROOT_GID; | |
28a6d671 EB |
1501 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
1502 | if (task) { | |
0499680a VK |
1503 | if (!has_pid_permissions(pid, task, 2)) { |
1504 | rcu_read_unlock(); | |
1505 | /* | |
1506 | * This doesn't prevent learning whether PID exists, | |
1507 | * it only makes getattr() consistent with readdir(). | |
1508 | */ | |
1509 | return -ENOENT; | |
1510 | } | |
28a6d671 EB |
1511 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
1512 | task_dumpable(task)) { | |
c69e8d9c DH |
1513 | cred = __task_cred(task); |
1514 | stat->uid = cred->euid; | |
1515 | stat->gid = cred->egid; | |
1da177e4 LT |
1516 | } |
1517 | } | |
28a6d671 | 1518 | rcu_read_unlock(); |
d6e71144 | 1519 | return 0; |
1da177e4 LT |
1520 | } |
1521 | ||
1da177e4 LT |
1522 | /* dentry stuff */ |
1523 | ||
1524 | /* | |
1525 | * Exceptional case: normally we are not allowed to unhash a busy | |
1526 | * directory. In this case, however, we can do it - no aliasing problems | |
1527 | * due to the way we treat inodes. | |
1528 | * | |
1529 | * Rewrite the inode's ownerships here because the owning task may have | |
1530 | * performed a setuid(), etc. | |
99f89551 EB |
1531 | * |
1532 | * Before the /proc/pid/status file was created the only way to read | |
1533 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1534 | * /proc/pid/status is slow enough that procps and other packages | |
1535 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1536 | * made this apply to all per process world readable and executable | |
1537 | * directories. | |
1da177e4 | 1538 | */ |
0b728e19 | 1539 | int pid_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1540 | { |
34286d66 NP |
1541 | struct inode *inode; |
1542 | struct task_struct *task; | |
c69e8d9c DH |
1543 | const struct cred *cred; |
1544 | ||
0b728e19 | 1545 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1546 | return -ECHILD; |
1547 | ||
1548 | inode = dentry->d_inode; | |
1549 | task = get_proc_task(inode); | |
1550 | ||
99f89551 EB |
1551 | if (task) { |
1552 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1553 | task_dumpable(task)) { | |
c69e8d9c DH |
1554 | rcu_read_lock(); |
1555 | cred = __task_cred(task); | |
1556 | inode->i_uid = cred->euid; | |
1557 | inode->i_gid = cred->egid; | |
1558 | rcu_read_unlock(); | |
1da177e4 | 1559 | } else { |
dcb0f222 EB |
1560 | inode->i_uid = GLOBAL_ROOT_UID; |
1561 | inode->i_gid = GLOBAL_ROOT_GID; | |
1da177e4 | 1562 | } |
9ee8ab9f | 1563 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1564 | security_task_to_inode(task, inode); |
99f89551 | 1565 | put_task_struct(task); |
1da177e4 LT |
1566 | return 1; |
1567 | } | |
1da177e4 LT |
1568 | return 0; |
1569 | } | |
1570 | ||
d855a4b7 ON |
1571 | static inline bool proc_inode_is_dead(struct inode *inode) |
1572 | { | |
1573 | return !proc_pid(inode)->tasks[PIDTYPE_PID].first; | |
1574 | } | |
1575 | ||
1dd704b6 DH |
1576 | int pid_delete_dentry(const struct dentry *dentry) |
1577 | { | |
1578 | /* Is the task we represent dead? | |
1579 | * If so, then don't put the dentry on the lru list, | |
1580 | * kill it immediately. | |
1581 | */ | |
d855a4b7 | 1582 | return proc_inode_is_dead(dentry->d_inode); |
1dd704b6 DH |
1583 | } |
1584 | ||
6b4e306a | 1585 | const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1586 | { |
1587 | .d_revalidate = pid_revalidate, | |
1588 | .d_delete = pid_delete_dentry, | |
1589 | }; | |
1590 | ||
1591 | /* Lookups */ | |
1592 | ||
1c0d04c9 EB |
1593 | /* |
1594 | * Fill a directory entry. | |
1595 | * | |
1596 | * If possible create the dcache entry and derive our inode number and | |
1597 | * file type from dcache entry. | |
1598 | * | |
1599 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1600 | * numbers do not exist until the inode is cache. This means creating the | |
1601 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1602 | * reported by readdir in sync with the inode numbers reported | |
1603 | * by stat. | |
1604 | */ | |
f0c3b509 | 1605 | bool proc_fill_cache(struct file *file, struct dir_context *ctx, |
6b4e306a | 1606 | const char *name, int len, |
c5141e6d | 1607 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1608 | { |
f0c3b509 | 1609 | struct dentry *child, *dir = file->f_path.dentry; |
1df98b8b | 1610 | struct qstr qname = QSTR_INIT(name, len); |
61a28784 | 1611 | struct inode *inode; |
1df98b8b AV |
1612 | unsigned type; |
1613 | ino_t ino; | |
61a28784 | 1614 | |
1df98b8b | 1615 | child = d_hash_and_lookup(dir, &qname); |
61a28784 | 1616 | if (!child) { |
1df98b8b AV |
1617 | child = d_alloc(dir, &qname); |
1618 | if (!child) | |
1619 | goto end_instantiate; | |
1620 | if (instantiate(dir->d_inode, child, task, ptr) < 0) { | |
1621 | dput(child); | |
1622 | goto end_instantiate; | |
61a28784 EB |
1623 | } |
1624 | } | |
61a28784 | 1625 | inode = child->d_inode; |
147ce699 AV |
1626 | ino = inode->i_ino; |
1627 | type = inode->i_mode >> 12; | |
61a28784 | 1628 | dput(child); |
f0c3b509 | 1629 | return dir_emit(ctx, name, len, ino, type); |
1df98b8b AV |
1630 | |
1631 | end_instantiate: | |
1632 | return dir_emit(ctx, name, len, 1, DT_UNKNOWN); | |
61a28784 EB |
1633 | } |
1634 | ||
640708a2 PE |
1635 | #ifdef CONFIG_CHECKPOINT_RESTORE |
1636 | ||
1637 | /* | |
1638 | * dname_to_vma_addr - maps a dentry name into two unsigned longs | |
1639 | * which represent vma start and end addresses. | |
1640 | */ | |
1641 | static int dname_to_vma_addr(struct dentry *dentry, | |
1642 | unsigned long *start, unsigned long *end) | |
1643 | { | |
1644 | if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2) | |
1645 | return -EINVAL; | |
1646 | ||
1647 | return 0; | |
1648 | } | |
1649 | ||
0b728e19 | 1650 | static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) |
640708a2 PE |
1651 | { |
1652 | unsigned long vm_start, vm_end; | |
1653 | bool exact_vma_exists = false; | |
1654 | struct mm_struct *mm = NULL; | |
1655 | struct task_struct *task; | |
1656 | const struct cred *cred; | |
1657 | struct inode *inode; | |
1658 | int status = 0; | |
1659 | ||
0b728e19 | 1660 | if (flags & LOOKUP_RCU) |
640708a2 PE |
1661 | return -ECHILD; |
1662 | ||
1663 | if (!capable(CAP_SYS_ADMIN)) { | |
41735818 | 1664 | status = -EPERM; |
640708a2 PE |
1665 | goto out_notask; |
1666 | } | |
1667 | ||
1668 | inode = dentry->d_inode; | |
1669 | task = get_proc_task(inode); | |
1670 | if (!task) | |
1671 | goto out_notask; | |
1672 | ||
2344bec7 CW |
1673 | mm = mm_access(task, PTRACE_MODE_READ); |
1674 | if (IS_ERR_OR_NULL(mm)) | |
640708a2 PE |
1675 | goto out; |
1676 | ||
1677 | if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { | |
1678 | down_read(&mm->mmap_sem); | |
1679 | exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); | |
1680 | up_read(&mm->mmap_sem); | |
1681 | } | |
1682 | ||
1683 | mmput(mm); | |
1684 | ||
1685 | if (exact_vma_exists) { | |
1686 | if (task_dumpable(task)) { | |
1687 | rcu_read_lock(); | |
1688 | cred = __task_cred(task); | |
1689 | inode->i_uid = cred->euid; | |
1690 | inode->i_gid = cred->egid; | |
1691 | rcu_read_unlock(); | |
1692 | } else { | |
dcb0f222 EB |
1693 | inode->i_uid = GLOBAL_ROOT_UID; |
1694 | inode->i_gid = GLOBAL_ROOT_GID; | |
640708a2 PE |
1695 | } |
1696 | security_task_to_inode(task, inode); | |
1697 | status = 1; | |
1698 | } | |
1699 | ||
1700 | out: | |
1701 | put_task_struct(task); | |
1702 | ||
1703 | out_notask: | |
640708a2 PE |
1704 | return status; |
1705 | } | |
1706 | ||
1707 | static const struct dentry_operations tid_map_files_dentry_operations = { | |
1708 | .d_revalidate = map_files_d_revalidate, | |
1709 | .d_delete = pid_delete_dentry, | |
1710 | }; | |
1711 | ||
1712 | static int proc_map_files_get_link(struct dentry *dentry, struct path *path) | |
1713 | { | |
1714 | unsigned long vm_start, vm_end; | |
1715 | struct vm_area_struct *vma; | |
1716 | struct task_struct *task; | |
1717 | struct mm_struct *mm; | |
1718 | int rc; | |
1719 | ||
1720 | rc = -ENOENT; | |
1721 | task = get_proc_task(dentry->d_inode); | |
1722 | if (!task) | |
1723 | goto out; | |
1724 | ||
1725 | mm = get_task_mm(task); | |
1726 | put_task_struct(task); | |
1727 | if (!mm) | |
1728 | goto out; | |
1729 | ||
1730 | rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); | |
1731 | if (rc) | |
1732 | goto out_mmput; | |
1733 | ||
70335abb | 1734 | rc = -ENOENT; |
640708a2 PE |
1735 | down_read(&mm->mmap_sem); |
1736 | vma = find_exact_vma(mm, vm_start, vm_end); | |
1737 | if (vma && vma->vm_file) { | |
1738 | *path = vma->vm_file->f_path; | |
1739 | path_get(path); | |
1740 | rc = 0; | |
1741 | } | |
1742 | up_read(&mm->mmap_sem); | |
1743 | ||
1744 | out_mmput: | |
1745 | mmput(mm); | |
1746 | out: | |
1747 | return rc; | |
1748 | } | |
1749 | ||
1750 | struct map_files_info { | |
7b540d06 | 1751 | fmode_t mode; |
640708a2 PE |
1752 | unsigned long len; |
1753 | unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ | |
1754 | }; | |
1755 | ||
c52a47ac | 1756 | static int |
640708a2 PE |
1757 | proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, |
1758 | struct task_struct *task, const void *ptr) | |
1759 | { | |
7b540d06 | 1760 | fmode_t mode = (fmode_t)(unsigned long)ptr; |
640708a2 PE |
1761 | struct proc_inode *ei; |
1762 | struct inode *inode; | |
1763 | ||
640708a2 PE |
1764 | inode = proc_pid_make_inode(dir->i_sb, task); |
1765 | if (!inode) | |
c52a47ac | 1766 | return -ENOENT; |
640708a2 PE |
1767 | |
1768 | ei = PROC_I(inode); | |
1769 | ei->op.proc_get_link = proc_map_files_get_link; | |
1770 | ||
1771 | inode->i_op = &proc_pid_link_inode_operations; | |
1772 | inode->i_size = 64; | |
1773 | inode->i_mode = S_IFLNK; | |
1774 | ||
7b540d06 | 1775 | if (mode & FMODE_READ) |
640708a2 | 1776 | inode->i_mode |= S_IRUSR; |
7b540d06 | 1777 | if (mode & FMODE_WRITE) |
640708a2 PE |
1778 | inode->i_mode |= S_IWUSR; |
1779 | ||
1780 | d_set_d_op(dentry, &tid_map_files_dentry_operations); | |
1781 | d_add(dentry, inode); | |
1782 | ||
c52a47ac | 1783 | return 0; |
640708a2 PE |
1784 | } |
1785 | ||
1786 | static struct dentry *proc_map_files_lookup(struct inode *dir, | |
00cd8dd3 | 1787 | struct dentry *dentry, unsigned int flags) |
640708a2 PE |
1788 | { |
1789 | unsigned long vm_start, vm_end; | |
1790 | struct vm_area_struct *vma; | |
1791 | struct task_struct *task; | |
c52a47ac | 1792 | int result; |
640708a2 PE |
1793 | struct mm_struct *mm; |
1794 | ||
c52a47ac | 1795 | result = -EPERM; |
640708a2 PE |
1796 | if (!capable(CAP_SYS_ADMIN)) |
1797 | goto out; | |
1798 | ||
c52a47ac | 1799 | result = -ENOENT; |
640708a2 PE |
1800 | task = get_proc_task(dir); |
1801 | if (!task) | |
1802 | goto out; | |
1803 | ||
c52a47ac | 1804 | result = -EACCES; |
eb94cd96 | 1805 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
640708a2 PE |
1806 | goto out_put_task; |
1807 | ||
c52a47ac | 1808 | result = -ENOENT; |
640708a2 | 1809 | if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) |
eb94cd96 | 1810 | goto out_put_task; |
640708a2 PE |
1811 | |
1812 | mm = get_task_mm(task); | |
1813 | if (!mm) | |
eb94cd96 | 1814 | goto out_put_task; |
640708a2 PE |
1815 | |
1816 | down_read(&mm->mmap_sem); | |
1817 | vma = find_exact_vma(mm, vm_start, vm_end); | |
1818 | if (!vma) | |
1819 | goto out_no_vma; | |
1820 | ||
05f56484 SK |
1821 | if (vma->vm_file) |
1822 | result = proc_map_files_instantiate(dir, dentry, task, | |
1823 | (void *)(unsigned long)vma->vm_file->f_mode); | |
640708a2 PE |
1824 | |
1825 | out_no_vma: | |
1826 | up_read(&mm->mmap_sem); | |
1827 | mmput(mm); | |
640708a2 PE |
1828 | out_put_task: |
1829 | put_task_struct(task); | |
1830 | out: | |
c52a47ac | 1831 | return ERR_PTR(result); |
640708a2 PE |
1832 | } |
1833 | ||
1834 | static const struct inode_operations proc_map_files_inode_operations = { | |
1835 | .lookup = proc_map_files_lookup, | |
1836 | .permission = proc_fd_permission, | |
1837 | .setattr = proc_setattr, | |
1838 | }; | |
1839 | ||
1840 | static int | |
f0c3b509 | 1841 | proc_map_files_readdir(struct file *file, struct dir_context *ctx) |
640708a2 | 1842 | { |
640708a2 PE |
1843 | struct vm_area_struct *vma; |
1844 | struct task_struct *task; | |
1845 | struct mm_struct *mm; | |
f0c3b509 AV |
1846 | unsigned long nr_files, pos, i; |
1847 | struct flex_array *fa = NULL; | |
1848 | struct map_files_info info; | |
1849 | struct map_files_info *p; | |
640708a2 PE |
1850 | int ret; |
1851 | ||
41735818 | 1852 | ret = -EPERM; |
640708a2 PE |
1853 | if (!capable(CAP_SYS_ADMIN)) |
1854 | goto out; | |
1855 | ||
1856 | ret = -ENOENT; | |
f0c3b509 | 1857 | task = get_proc_task(file_inode(file)); |
640708a2 PE |
1858 | if (!task) |
1859 | goto out; | |
1860 | ||
1861 | ret = -EACCES; | |
eb94cd96 | 1862 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
640708a2 PE |
1863 | goto out_put_task; |
1864 | ||
1865 | ret = 0; | |
f0c3b509 AV |
1866 | if (!dir_emit_dots(file, ctx)) |
1867 | goto out_put_task; | |
640708a2 | 1868 | |
f0c3b509 AV |
1869 | mm = get_task_mm(task); |
1870 | if (!mm) | |
1871 | goto out_put_task; | |
1872 | down_read(&mm->mmap_sem); | |
640708a2 | 1873 | |
f0c3b509 | 1874 | nr_files = 0; |
640708a2 | 1875 | |
f0c3b509 AV |
1876 | /* |
1877 | * We need two passes here: | |
1878 | * | |
1879 | * 1) Collect vmas of mapped files with mmap_sem taken | |
1880 | * 2) Release mmap_sem and instantiate entries | |
1881 | * | |
1882 | * otherwise we get lockdep complained, since filldir() | |
1883 | * routine might require mmap_sem taken in might_fault(). | |
1884 | */ | |
640708a2 | 1885 | |
f0c3b509 AV |
1886 | for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { |
1887 | if (vma->vm_file && ++pos > ctx->pos) | |
1888 | nr_files++; | |
1889 | } | |
1890 | ||
1891 | if (nr_files) { | |
1892 | fa = flex_array_alloc(sizeof(info), nr_files, | |
1893 | GFP_KERNEL); | |
1894 | if (!fa || flex_array_prealloc(fa, 0, nr_files, | |
1895 | GFP_KERNEL)) { | |
1896 | ret = -ENOMEM; | |
1897 | if (fa) | |
1898 | flex_array_free(fa); | |
1899 | up_read(&mm->mmap_sem); | |
1900 | mmput(mm); | |
1901 | goto out_put_task; | |
640708a2 | 1902 | } |
f0c3b509 AV |
1903 | for (i = 0, vma = mm->mmap, pos = 2; vma; |
1904 | vma = vma->vm_next) { | |
1905 | if (!vma->vm_file) | |
1906 | continue; | |
1907 | if (++pos <= ctx->pos) | |
1908 | continue; | |
1909 | ||
1910 | info.mode = vma->vm_file->f_mode; | |
1911 | info.len = snprintf(info.name, | |
1912 | sizeof(info.name), "%lx-%lx", | |
1913 | vma->vm_start, vma->vm_end); | |
1914 | if (flex_array_put(fa, i++, &info, GFP_KERNEL)) | |
1915 | BUG(); | |
640708a2 | 1916 | } |
640708a2 | 1917 | } |
f0c3b509 AV |
1918 | up_read(&mm->mmap_sem); |
1919 | ||
1920 | for (i = 0; i < nr_files; i++) { | |
1921 | p = flex_array_get(fa, i); | |
1922 | if (!proc_fill_cache(file, ctx, | |
1923 | p->name, p->len, | |
1924 | proc_map_files_instantiate, | |
1925 | task, | |
1926 | (void *)(unsigned long)p->mode)) | |
1927 | break; | |
1928 | ctx->pos++; | |
640708a2 | 1929 | } |
f0c3b509 AV |
1930 | if (fa) |
1931 | flex_array_free(fa); | |
1932 | mmput(mm); | |
640708a2 | 1933 | |
640708a2 PE |
1934 | out_put_task: |
1935 | put_task_struct(task); | |
1936 | out: | |
1937 | return ret; | |
1938 | } | |
1939 | ||
1940 | static const struct file_operations proc_map_files_operations = { | |
1941 | .read = generic_read_dir, | |
f0c3b509 | 1942 | .iterate = proc_map_files_readdir, |
640708a2 PE |
1943 | .llseek = default_llseek, |
1944 | }; | |
1945 | ||
48f6a7a5 PE |
1946 | struct timers_private { |
1947 | struct pid *pid; | |
1948 | struct task_struct *task; | |
1949 | struct sighand_struct *sighand; | |
57b8015e | 1950 | struct pid_namespace *ns; |
48f6a7a5 PE |
1951 | unsigned long flags; |
1952 | }; | |
1953 | ||
1954 | static void *timers_start(struct seq_file *m, loff_t *pos) | |
1955 | { | |
1956 | struct timers_private *tp = m->private; | |
1957 | ||
1958 | tp->task = get_pid_task(tp->pid, PIDTYPE_PID); | |
1959 | if (!tp->task) | |
1960 | return ERR_PTR(-ESRCH); | |
1961 | ||
1962 | tp->sighand = lock_task_sighand(tp->task, &tp->flags); | |
1963 | if (!tp->sighand) | |
1964 | return ERR_PTR(-ESRCH); | |
1965 | ||
1966 | return seq_list_start(&tp->task->signal->posix_timers, *pos); | |
1967 | } | |
1968 | ||
1969 | static void *timers_next(struct seq_file *m, void *v, loff_t *pos) | |
1970 | { | |
1971 | struct timers_private *tp = m->private; | |
1972 | return seq_list_next(v, &tp->task->signal->posix_timers, pos); | |
1973 | } | |
1974 | ||
1975 | static void timers_stop(struct seq_file *m, void *v) | |
1976 | { | |
1977 | struct timers_private *tp = m->private; | |
1978 | ||
1979 | if (tp->sighand) { | |
1980 | unlock_task_sighand(tp->task, &tp->flags); | |
1981 | tp->sighand = NULL; | |
1982 | } | |
1983 | ||
1984 | if (tp->task) { | |
1985 | put_task_struct(tp->task); | |
1986 | tp->task = NULL; | |
1987 | } | |
1988 | } | |
1989 | ||
1990 | static int show_timer(struct seq_file *m, void *v) | |
1991 | { | |
1992 | struct k_itimer *timer; | |
57b8015e PE |
1993 | struct timers_private *tp = m->private; |
1994 | int notify; | |
cedbccab | 1995 | static const char * const nstr[] = { |
57b8015e PE |
1996 | [SIGEV_SIGNAL] = "signal", |
1997 | [SIGEV_NONE] = "none", | |
1998 | [SIGEV_THREAD] = "thread", | |
1999 | }; | |
48f6a7a5 PE |
2000 | |
2001 | timer = list_entry((struct list_head *)v, struct k_itimer, list); | |
57b8015e PE |
2002 | notify = timer->it_sigev_notify; |
2003 | ||
48f6a7a5 | 2004 | seq_printf(m, "ID: %d\n", timer->it_id); |
57b8015e PE |
2005 | seq_printf(m, "signal: %d/%p\n", timer->sigq->info.si_signo, |
2006 | timer->sigq->info.si_value.sival_ptr); | |
2007 | seq_printf(m, "notify: %s/%s.%d\n", | |
2008 | nstr[notify & ~SIGEV_THREAD_ID], | |
2009 | (notify & SIGEV_THREAD_ID) ? "tid" : "pid", | |
2010 | pid_nr_ns(timer->it_pid, tp->ns)); | |
15ef0298 | 2011 | seq_printf(m, "ClockID: %d\n", timer->it_clock); |
48f6a7a5 PE |
2012 | |
2013 | return 0; | |
2014 | } | |
2015 | ||
2016 | static const struct seq_operations proc_timers_seq_ops = { | |
2017 | .start = timers_start, | |
2018 | .next = timers_next, | |
2019 | .stop = timers_stop, | |
2020 | .show = show_timer, | |
2021 | }; | |
2022 | ||
2023 | static int proc_timers_open(struct inode *inode, struct file *file) | |
2024 | { | |
2025 | struct timers_private *tp; | |
2026 | ||
2027 | tp = __seq_open_private(file, &proc_timers_seq_ops, | |
2028 | sizeof(struct timers_private)); | |
2029 | if (!tp) | |
2030 | return -ENOMEM; | |
2031 | ||
2032 | tp->pid = proc_pid(inode); | |
57b8015e | 2033 | tp->ns = inode->i_sb->s_fs_info; |
48f6a7a5 PE |
2034 | return 0; |
2035 | } | |
2036 | ||
2037 | static const struct file_operations proc_timers_operations = { | |
2038 | .open = proc_timers_open, | |
2039 | .read = seq_read, | |
2040 | .llseek = seq_lseek, | |
2041 | .release = seq_release_private, | |
2042 | }; | |
640708a2 PE |
2043 | #endif /* CONFIG_CHECKPOINT_RESTORE */ |
2044 | ||
c52a47ac | 2045 | static int proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2046 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2047 | { |
c5141e6d | 2048 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2049 | struct inode *inode; |
2050 | struct proc_inode *ei; | |
444ceed8 | 2051 | |
61a28784 | 2052 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2053 | if (!inode) |
2054 | goto out; | |
2055 | ||
2056 | ei = PROC_I(inode); | |
2057 | inode->i_mode = p->mode; | |
2058 | if (S_ISDIR(inode->i_mode)) | |
bfe86848 | 2059 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
444ceed8 EB |
2060 | if (p->iop) |
2061 | inode->i_op = p->iop; | |
2062 | if (p->fop) | |
2063 | inode->i_fop = p->fop; | |
2064 | ei->op = p->op; | |
fb045adb | 2065 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2066 | d_add(dentry, inode); |
2067 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2068 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 2069 | return 0; |
444ceed8 | 2070 | out: |
c52a47ac | 2071 | return -ENOENT; |
444ceed8 EB |
2072 | } |
2073 | ||
1da177e4 LT |
2074 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2075 | struct dentry *dentry, | |
c5141e6d | 2076 | const struct pid_entry *ents, |
7bcd6b0e | 2077 | unsigned int nents) |
1da177e4 | 2078 | { |
c52a47ac | 2079 | int error; |
99f89551 | 2080 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2081 | const struct pid_entry *p, *last; |
1da177e4 | 2082 | |
c52a47ac | 2083 | error = -ENOENT; |
1da177e4 | 2084 | |
99f89551 EB |
2085 | if (!task) |
2086 | goto out_no_task; | |
1da177e4 | 2087 | |
20cdc894 EB |
2088 | /* |
2089 | * Yes, it does not scale. And it should not. Don't add | |
2090 | * new entries into /proc/<tgid>/ without very good reasons. | |
2091 | */ | |
7bcd6b0e EB |
2092 | last = &ents[nents - 1]; |
2093 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2094 | if (p->len != dentry->d_name.len) |
2095 | continue; | |
2096 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2097 | break; | |
2098 | } | |
7bcd6b0e | 2099 | if (p > last) |
1da177e4 LT |
2100 | goto out; |
2101 | ||
444ceed8 | 2102 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2103 | out: |
99f89551 EB |
2104 | put_task_struct(task); |
2105 | out_no_task: | |
c52a47ac | 2106 | return ERR_PTR(error); |
1da177e4 LT |
2107 | } |
2108 | ||
f0c3b509 | 2109 | static int proc_pident_readdir(struct file *file, struct dir_context *ctx, |
c5141e6d | 2110 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 | 2111 | { |
f0c3b509 AV |
2112 | struct task_struct *task = get_proc_task(file_inode(file)); |
2113 | const struct pid_entry *p; | |
28a6d671 | 2114 | |
28a6d671 | 2115 | if (!task) |
f0c3b509 | 2116 | return -ENOENT; |
28a6d671 | 2117 | |
f0c3b509 AV |
2118 | if (!dir_emit_dots(file, ctx)) |
2119 | goto out; | |
2120 | ||
2121 | if (ctx->pos >= nents + 2) | |
2122 | goto out; | |
28a6d671 | 2123 | |
f0c3b509 AV |
2124 | for (p = ents + (ctx->pos - 2); p <= ents + nents - 1; p++) { |
2125 | if (!proc_fill_cache(file, ctx, p->name, p->len, | |
2126 | proc_pident_instantiate, task, p)) | |
2127 | break; | |
2128 | ctx->pos++; | |
2129 | } | |
28a6d671 | 2130 | out: |
61a28784 | 2131 | put_task_struct(task); |
f0c3b509 | 2132 | return 0; |
1da177e4 LT |
2133 | } |
2134 | ||
28a6d671 EB |
2135 | #ifdef CONFIG_SECURITY |
2136 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2137 | size_t count, loff_t *ppos) | |
2138 | { | |
496ad9aa | 2139 | struct inode * inode = file_inode(file); |
04ff9708 | 2140 | char *p = NULL; |
28a6d671 EB |
2141 | ssize_t length; |
2142 | struct task_struct *task = get_proc_task(inode); | |
2143 | ||
28a6d671 | 2144 | if (!task) |
04ff9708 | 2145 | return -ESRCH; |
28a6d671 EB |
2146 | |
2147 | length = security_getprocattr(task, | |
2fddfeef | 2148 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2149 | &p); |
28a6d671 | 2150 | put_task_struct(task); |
04ff9708 AV |
2151 | if (length > 0) |
2152 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2153 | kfree(p); | |
28a6d671 | 2154 | return length; |
1da177e4 LT |
2155 | } |
2156 | ||
28a6d671 EB |
2157 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2158 | size_t count, loff_t *ppos) | |
2159 | { | |
496ad9aa | 2160 | struct inode * inode = file_inode(file); |
28a6d671 EB |
2161 | char *page; |
2162 | ssize_t length; | |
2163 | struct task_struct *task = get_proc_task(inode); | |
2164 | ||
2165 | length = -ESRCH; | |
2166 | if (!task) | |
2167 | goto out_no_task; | |
2168 | if (count > PAGE_SIZE) | |
2169 | count = PAGE_SIZE; | |
2170 | ||
2171 | /* No partial writes. */ | |
2172 | length = -EINVAL; | |
2173 | if (*ppos != 0) | |
2174 | goto out; | |
2175 | ||
2176 | length = -ENOMEM; | |
e12ba74d | 2177 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2178 | if (!page) |
2179 | goto out; | |
2180 | ||
2181 | length = -EFAULT; | |
2182 | if (copy_from_user(page, buf, count)) | |
2183 | goto out_free; | |
2184 | ||
107db7c7 | 2185 | /* Guard against adverse ptrace interaction */ |
9b1bf12d | 2186 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
107db7c7 DH |
2187 | if (length < 0) |
2188 | goto out_free; | |
2189 | ||
28a6d671 | 2190 | length = security_setprocattr(task, |
2fddfeef | 2191 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 | 2192 | (void*)page, count); |
9b1bf12d | 2193 | mutex_unlock(&task->signal->cred_guard_mutex); |
28a6d671 EB |
2194 | out_free: |
2195 | free_page((unsigned long) page); | |
2196 | out: | |
2197 | put_task_struct(task); | |
2198 | out_no_task: | |
2199 | return length; | |
2200 | } | |
2201 | ||
00977a59 | 2202 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2203 | .read = proc_pid_attr_read, |
2204 | .write = proc_pid_attr_write, | |
87df8424 | 2205 | .llseek = generic_file_llseek, |
28a6d671 EB |
2206 | }; |
2207 | ||
c5141e6d | 2208 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2209 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2210 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2211 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2212 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2213 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2214 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2215 | }; |
2216 | ||
f0c3b509 | 2217 | static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 2218 | { |
f0c3b509 AV |
2219 | return proc_pident_readdir(file, ctx, |
2220 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2221 | } |
2222 | ||
00977a59 | 2223 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2224 | .read = generic_read_dir, |
f0c3b509 | 2225 | .iterate = proc_attr_dir_readdir, |
6038f373 | 2226 | .llseek = default_llseek, |
1da177e4 LT |
2227 | }; |
2228 | ||
72d9dcfc | 2229 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
00cd8dd3 | 2230 | struct dentry *dentry, unsigned int flags) |
28a6d671 | 2231 | { |
7bcd6b0e EB |
2232 | return proc_pident_lookup(dir, dentry, |
2233 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2234 | } |
2235 | ||
c5ef1c42 | 2236 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2237 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2238 | .getattr = pid_getattr, |
6d76fa58 | 2239 | .setattr = proc_setattr, |
1da177e4 LT |
2240 | }; |
2241 | ||
28a6d671 EB |
2242 | #endif |
2243 | ||
698ba7b5 | 2244 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2245 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2246 | size_t count, loff_t *ppos) | |
2247 | { | |
496ad9aa | 2248 | struct task_struct *task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2249 | struct mm_struct *mm; |
2250 | char buffer[PROC_NUMBUF]; | |
2251 | size_t len; | |
2252 | int ret; | |
2253 | ||
2254 | if (!task) | |
2255 | return -ESRCH; | |
2256 | ||
2257 | ret = 0; | |
2258 | mm = get_task_mm(task); | |
2259 | if (mm) { | |
2260 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2261 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2262 | MMF_DUMP_FILTER_SHIFT)); | |
2263 | mmput(mm); | |
2264 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2265 | } | |
2266 | ||
2267 | put_task_struct(task); | |
2268 | ||
2269 | return ret; | |
2270 | } | |
2271 | ||
2272 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2273 | const char __user *buf, | |
2274 | size_t count, | |
2275 | loff_t *ppos) | |
2276 | { | |
2277 | struct task_struct *task; | |
2278 | struct mm_struct *mm; | |
2279 | char buffer[PROC_NUMBUF], *end; | |
2280 | unsigned int val; | |
2281 | int ret; | |
2282 | int i; | |
2283 | unsigned long mask; | |
2284 | ||
2285 | ret = -EFAULT; | |
2286 | memset(buffer, 0, sizeof(buffer)); | |
2287 | if (count > sizeof(buffer) - 1) | |
2288 | count = sizeof(buffer) - 1; | |
2289 | if (copy_from_user(buffer, buf, count)) | |
2290 | goto out_no_task; | |
2291 | ||
2292 | ret = -EINVAL; | |
2293 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2294 | if (*end == '\n') | |
2295 | end++; | |
2296 | if (end - buffer == 0) | |
2297 | goto out_no_task; | |
2298 | ||
2299 | ret = -ESRCH; | |
496ad9aa | 2300 | task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2301 | if (!task) |
2302 | goto out_no_task; | |
2303 | ||
2304 | ret = end - buffer; | |
2305 | mm = get_task_mm(task); | |
2306 | if (!mm) | |
2307 | goto out_no_mm; | |
2308 | ||
2309 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2310 | if (val & mask) | |
2311 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2312 | else | |
2313 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2314 | } | |
2315 | ||
2316 | mmput(mm); | |
2317 | out_no_mm: | |
2318 | put_task_struct(task); | |
2319 | out_no_task: | |
2320 | return ret; | |
2321 | } | |
2322 | ||
2323 | static const struct file_operations proc_coredump_filter_operations = { | |
2324 | .read = proc_coredump_filter_read, | |
2325 | .write = proc_coredump_filter_write, | |
87df8424 | 2326 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2327 | }; |
2328 | #endif | |
2329 | ||
aba76fdb | 2330 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2331 | static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole) |
297c5d92 | 2332 | { |
940389b8 | 2333 | struct task_io_accounting acct = task->ioac; |
5995477a | 2334 | unsigned long flags; |
293eb1e7 | 2335 | int result; |
5995477a | 2336 | |
293eb1e7 VK |
2337 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
2338 | if (result) | |
2339 | return result; | |
2340 | ||
2341 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) { | |
2342 | result = -EACCES; | |
2343 | goto out_unlock; | |
2344 | } | |
1d1221f3 | 2345 | |
5995477a AR |
2346 | if (whole && lock_task_sighand(task, &flags)) { |
2347 | struct task_struct *t = task; | |
2348 | ||
2349 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2350 | while_each_thread(task, t) | |
2351 | task_io_accounting_add(&acct, &t->ioac); | |
2352 | ||
2353 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2354 | } |
19aadc98 | 2355 | result = seq_printf(m, |
aba76fdb AM |
2356 | "rchar: %llu\n" |
2357 | "wchar: %llu\n" | |
2358 | "syscr: %llu\n" | |
2359 | "syscw: %llu\n" | |
2360 | "read_bytes: %llu\n" | |
2361 | "write_bytes: %llu\n" | |
2362 | "cancelled_write_bytes: %llu\n", | |
7c44319d AB |
2363 | (unsigned long long)acct.rchar, |
2364 | (unsigned long long)acct.wchar, | |
2365 | (unsigned long long)acct.syscr, | |
2366 | (unsigned long long)acct.syscw, | |
2367 | (unsigned long long)acct.read_bytes, | |
2368 | (unsigned long long)acct.write_bytes, | |
2369 | (unsigned long long)acct.cancelled_write_bytes); | |
293eb1e7 VK |
2370 | out_unlock: |
2371 | mutex_unlock(&task->signal->cred_guard_mutex); | |
2372 | return result; | |
297c5d92 AR |
2373 | } |
2374 | ||
19aadc98 AD |
2375 | static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2376 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2377 | { |
19aadc98 | 2378 | return do_io_accounting(task, m, 0); |
aba76fdb | 2379 | } |
297c5d92 | 2380 | |
19aadc98 AD |
2381 | static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2382 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2383 | { |
19aadc98 | 2384 | return do_io_accounting(task, m, 1); |
297c5d92 AR |
2385 | } |
2386 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2387 | |
22d917d8 EB |
2388 | #ifdef CONFIG_USER_NS |
2389 | static int proc_id_map_open(struct inode *inode, struct file *file, | |
ccf94f1b | 2390 | const struct seq_operations *seq_ops) |
22d917d8 EB |
2391 | { |
2392 | struct user_namespace *ns = NULL; | |
2393 | struct task_struct *task; | |
2394 | struct seq_file *seq; | |
2395 | int ret = -EINVAL; | |
2396 | ||
2397 | task = get_proc_task(inode); | |
2398 | if (task) { | |
2399 | rcu_read_lock(); | |
2400 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2401 | rcu_read_unlock(); | |
2402 | put_task_struct(task); | |
2403 | } | |
2404 | if (!ns) | |
2405 | goto err; | |
2406 | ||
2407 | ret = seq_open(file, seq_ops); | |
2408 | if (ret) | |
2409 | goto err_put_ns; | |
2410 | ||
2411 | seq = file->private_data; | |
2412 | seq->private = ns; | |
2413 | ||
2414 | return 0; | |
2415 | err_put_ns: | |
2416 | put_user_ns(ns); | |
2417 | err: | |
2418 | return ret; | |
2419 | } | |
2420 | ||
2421 | static int proc_id_map_release(struct inode *inode, struct file *file) | |
2422 | { | |
2423 | struct seq_file *seq = file->private_data; | |
2424 | struct user_namespace *ns = seq->private; | |
2425 | put_user_ns(ns); | |
2426 | return seq_release(inode, file); | |
2427 | } | |
2428 | ||
2429 | static int proc_uid_map_open(struct inode *inode, struct file *file) | |
2430 | { | |
2431 | return proc_id_map_open(inode, file, &proc_uid_seq_operations); | |
2432 | } | |
2433 | ||
2434 | static int proc_gid_map_open(struct inode *inode, struct file *file) | |
2435 | { | |
2436 | return proc_id_map_open(inode, file, &proc_gid_seq_operations); | |
2437 | } | |
2438 | ||
f76d207a EB |
2439 | static int proc_projid_map_open(struct inode *inode, struct file *file) |
2440 | { | |
2441 | return proc_id_map_open(inode, file, &proc_projid_seq_operations); | |
2442 | } | |
2443 | ||
22d917d8 EB |
2444 | static const struct file_operations proc_uid_map_operations = { |
2445 | .open = proc_uid_map_open, | |
2446 | .write = proc_uid_map_write, | |
2447 | .read = seq_read, | |
2448 | .llseek = seq_lseek, | |
2449 | .release = proc_id_map_release, | |
2450 | }; | |
2451 | ||
2452 | static const struct file_operations proc_gid_map_operations = { | |
2453 | .open = proc_gid_map_open, | |
2454 | .write = proc_gid_map_write, | |
2455 | .read = seq_read, | |
2456 | .llseek = seq_lseek, | |
2457 | .release = proc_id_map_release, | |
2458 | }; | |
f76d207a EB |
2459 | |
2460 | static const struct file_operations proc_projid_map_operations = { | |
2461 | .open = proc_projid_map_open, | |
2462 | .write = proc_projid_map_write, | |
2463 | .read = seq_read, | |
2464 | .llseek = seq_lseek, | |
2465 | .release = proc_id_map_release, | |
2466 | }; | |
9cc46516 EB |
2467 | |
2468 | static int proc_setgroups_open(struct inode *inode, struct file *file) | |
2469 | { | |
2470 | struct user_namespace *ns = NULL; | |
2471 | struct task_struct *task; | |
2472 | int ret; | |
2473 | ||
2474 | ret = -ESRCH; | |
2475 | task = get_proc_task(inode); | |
2476 | if (task) { | |
2477 | rcu_read_lock(); | |
2478 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2479 | rcu_read_unlock(); | |
2480 | put_task_struct(task); | |
2481 | } | |
2482 | if (!ns) | |
2483 | goto err; | |
2484 | ||
2485 | if (file->f_mode & FMODE_WRITE) { | |
2486 | ret = -EACCES; | |
2487 | if (!ns_capable(ns, CAP_SYS_ADMIN)) | |
2488 | goto err_put_ns; | |
2489 | } | |
2490 | ||
2491 | ret = single_open(file, &proc_setgroups_show, ns); | |
2492 | if (ret) | |
2493 | goto err_put_ns; | |
2494 | ||
2495 | return 0; | |
2496 | err_put_ns: | |
2497 | put_user_ns(ns); | |
2498 | err: | |
2499 | return ret; | |
2500 | } | |
2501 | ||
2502 | static int proc_setgroups_release(struct inode *inode, struct file *file) | |
2503 | { | |
2504 | struct seq_file *seq = file->private_data; | |
2505 | struct user_namespace *ns = seq->private; | |
2506 | int ret = single_release(inode, file); | |
2507 | put_user_ns(ns); | |
2508 | return ret; | |
2509 | } | |
2510 | ||
2511 | static const struct file_operations proc_setgroups_operations = { | |
2512 | .open = proc_setgroups_open, | |
2513 | .write = proc_setgroups_write, | |
2514 | .read = seq_read, | |
2515 | .llseek = seq_lseek, | |
2516 | .release = proc_setgroups_release, | |
2517 | }; | |
22d917d8 EB |
2518 | #endif /* CONFIG_USER_NS */ |
2519 | ||
47830723 KC |
2520 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2521 | struct pid *pid, struct task_struct *task) | |
2522 | { | |
a9712bc1 AV |
2523 | int err = lock_trace(task); |
2524 | if (!err) { | |
2525 | seq_printf(m, "%08x\n", task->personality); | |
2526 | unlock_trace(task); | |
2527 | } | |
2528 | return err; | |
47830723 KC |
2529 | } |
2530 | ||
28a6d671 EB |
2531 | /* |
2532 | * Thread groups | |
2533 | */ | |
00977a59 | 2534 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2535 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2536 | |
c5141e6d | 2537 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2538 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2539 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
640708a2 PE |
2540 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2541 | DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), | |
2542 | #endif | |
631f9c18 | 2543 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 2544 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
b2211a36 | 2545 | #ifdef CONFIG_NET |
631f9c18 | 2546 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2547 | #endif |
631f9c18 | 2548 | REG("environ", S_IRUSR, proc_environ_operations), |
f9ea536e | 2549 | ONE("auxv", S_IRUSR, proc_pid_auxv), |
631f9c18 | 2550 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 2551 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 2552 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2553 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2554 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
5091faa4 MG |
2555 | #endif |
2556 | #ifdef CONFIG_SCHED_AUTOGROUP | |
2557 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), | |
ebcb6734 | 2558 | #endif |
4614a696 | 2559 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2560 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 2561 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2562 | #endif |
2ca66ff7 | 2563 | ONE("cmdline", S_IRUGO, proc_pid_cmdline), |
631f9c18 AD |
2564 | ONE("stat", S_IRUGO, proc_tgid_stat), |
2565 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 2566 | REG("maps", S_IRUGO, proc_pid_maps_operations), |
28a6d671 | 2567 | #ifdef CONFIG_NUMA |
b7643757 | 2568 | REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), |
28a6d671 | 2569 | #endif |
631f9c18 AD |
2570 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2571 | LNK("cwd", proc_cwd_link), | |
2572 | LNK("root", proc_root_link), | |
2573 | LNK("exe", proc_exe_link), | |
2574 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2575 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2576 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2577 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 2578 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 2579 | REG("smaps", S_IRUGO, proc_pid_smaps_operations), |
32ed74a4 | 2580 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
2581 | #endif |
2582 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2583 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2584 | #endif |
2585 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 2586 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2587 | #endif |
2ec220e2 | 2588 | #ifdef CONFIG_STACKTRACE |
35a35046 | 2589 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 EB |
2590 | #endif |
2591 | #ifdef CONFIG_SCHEDSTATS | |
f6e826ca | 2592 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2593 | #endif |
9745512c | 2594 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2595 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2596 | #endif |
8793d854 | 2597 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 2598 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
2599 | #endif |
2600 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 2601 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 2602 | #endif |
6ba51e37 | 2603 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 2604 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 2605 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2606 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2607 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2608 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2609 | #endif |
f4f154fd | 2610 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2611 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2612 | #endif |
698ba7b5 | 2613 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 2614 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2615 | #endif |
aba76fdb | 2616 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2617 | ONE("io", S_IRUSR, proc_tgid_io_accounting), |
aba76fdb | 2618 | #endif |
f133ecca | 2619 | #ifdef CONFIG_HARDWALL |
d962c144 | 2620 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 2621 | #endif |
22d917d8 EB |
2622 | #ifdef CONFIG_USER_NS |
2623 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
2624 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 2625 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 2626 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 2627 | #endif |
48f6a7a5 PE |
2628 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2629 | REG("timers", S_IRUGO, proc_timers_operations), | |
2630 | #endif | |
28a6d671 | 2631 | }; |
1da177e4 | 2632 | |
f0c3b509 | 2633 | static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 2634 | { |
f0c3b509 AV |
2635 | return proc_pident_readdir(file, ctx, |
2636 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2637 | } |
2638 | ||
00977a59 | 2639 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2640 | .read = generic_read_dir, |
f0c3b509 | 2641 | .iterate = proc_tgid_base_readdir, |
6038f373 | 2642 | .llseek = default_llseek, |
1da177e4 LT |
2643 | }; |
2644 | ||
00cd8dd3 AV |
2645 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
2646 | { | |
7bcd6b0e EB |
2647 | return proc_pident_lookup(dir, dentry, |
2648 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2649 | } |
2650 | ||
c5ef1c42 | 2651 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2652 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2653 | .getattr = pid_getattr, |
6d76fa58 | 2654 | .setattr = proc_setattr, |
0499680a | 2655 | .permission = proc_pid_permission, |
1da177e4 | 2656 | }; |
1da177e4 | 2657 | |
60347f67 | 2658 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2659 | { |
48e6484d | 2660 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2661 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2662 | struct qstr name; |
2663 | ||
2664 | name.name = buf; | |
60347f67 | 2665 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
4f522a24 | 2666 | /* no ->d_hash() rejects on procfs */ |
60347f67 | 2667 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
48e6484d | 2668 | if (dentry) { |
bbd51924 | 2669 | d_invalidate(dentry); |
48e6484d EB |
2670 | dput(dentry); |
2671 | } | |
1da177e4 | 2672 | |
c35a7f18 ON |
2673 | if (pid == tgid) |
2674 | return; | |
2675 | ||
48e6484d | 2676 | name.name = buf; |
60347f67 PE |
2677 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2678 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2679 | if (!leader) |
2680 | goto out; | |
1da177e4 | 2681 | |
48e6484d EB |
2682 | name.name = "task"; |
2683 | name.len = strlen(name.name); | |
2684 | dir = d_hash_and_lookup(leader, &name); | |
2685 | if (!dir) | |
2686 | goto out_put_leader; | |
2687 | ||
2688 | name.name = buf; | |
60347f67 | 2689 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2690 | dentry = d_hash_and_lookup(dir, &name); |
2691 | if (dentry) { | |
bbd51924 | 2692 | d_invalidate(dentry); |
48e6484d | 2693 | dput(dentry); |
1da177e4 | 2694 | } |
48e6484d EB |
2695 | |
2696 | dput(dir); | |
2697 | out_put_leader: | |
2698 | dput(leader); | |
2699 | out: | |
2700 | return; | |
1da177e4 LT |
2701 | } |
2702 | ||
0895e91d RD |
2703 | /** |
2704 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2705 | * @task: task that should be flushed. | |
2706 | * | |
2707 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2708 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2709 | * in. This call is supposed to do all of this job. |
2710 | * | |
2711 | * Looks in the dcache for | |
2712 | * /proc/@pid | |
2713 | * /proc/@tgid/task/@pid | |
2714 | * if either directory is present flushes it and all of it'ts children | |
2715 | * from the dcache. | |
2716 | * | |
2717 | * It is safe and reasonable to cache /proc entries for a task until | |
2718 | * that task exits. After that they just clog up the dcache with | |
2719 | * useless entries, possibly causing useful dcache entries to be | |
2720 | * flushed instead. This routine is proved to flush those useless | |
2721 | * dcache entries at process exit time. | |
2722 | * | |
2723 | * NOTE: This routine is just an optimization so it does not guarantee | |
2724 | * that no dcache entries will exist at process exit time it | |
2725 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2726 | */ |
2727 | ||
2728 | void proc_flush_task(struct task_struct *task) | |
2729 | { | |
9fcc2d15 | 2730 | int i; |
9b4d1cbe | 2731 | struct pid *pid, *tgid; |
130f77ec PE |
2732 | struct upid *upid; |
2733 | ||
130f77ec | 2734 | pid = task_pid(task); |
9b4d1cbe | 2735 | tgid = task_tgid(task); |
130f77ec | 2736 | |
9fcc2d15 | 2737 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2738 | upid = &pid->numbers[i]; |
2739 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 2740 | tgid->numbers[i].nr); |
130f77ec | 2741 | } |
60347f67 PE |
2742 | } |
2743 | ||
c52a47ac AV |
2744 | static int proc_pid_instantiate(struct inode *dir, |
2745 | struct dentry * dentry, | |
2746 | struct task_struct *task, const void *ptr) | |
444ceed8 | 2747 | { |
444ceed8 EB |
2748 | struct inode *inode; |
2749 | ||
61a28784 | 2750 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2751 | if (!inode) |
2752 | goto out; | |
2753 | ||
2754 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2755 | inode->i_op = &proc_tgid_base_inode_operations; | |
2756 | inode->i_fop = &proc_tgid_base_operations; | |
2757 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 2758 | |
bfe86848 MS |
2759 | set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, |
2760 | ARRAY_SIZE(tgid_base_stuff))); | |
444ceed8 | 2761 | |
fb045adb | 2762 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2763 | |
2764 | d_add(dentry, inode); | |
2765 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2766 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 2767 | return 0; |
444ceed8 | 2768 | out: |
c52a47ac | 2769 | return -ENOENT; |
444ceed8 EB |
2770 | } |
2771 | ||
00cd8dd3 | 2772 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 | 2773 | { |
335eb531 | 2774 | int result = -ENOENT; |
1da177e4 | 2775 | struct task_struct *task; |
1da177e4 | 2776 | unsigned tgid; |
b488893a | 2777 | struct pid_namespace *ns; |
1da177e4 | 2778 | |
dbcdb504 | 2779 | tgid = name_to_int(&dentry->d_name); |
1da177e4 LT |
2780 | if (tgid == ~0U) |
2781 | goto out; | |
2782 | ||
b488893a | 2783 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2784 | rcu_read_lock(); |
b488893a | 2785 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2786 | if (task) |
2787 | get_task_struct(task); | |
de758734 | 2788 | rcu_read_unlock(); |
1da177e4 LT |
2789 | if (!task) |
2790 | goto out; | |
2791 | ||
444ceed8 | 2792 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2793 | put_task_struct(task); |
1da177e4 | 2794 | out: |
c52a47ac | 2795 | return ERR_PTR(result); |
1da177e4 LT |
2796 | } |
2797 | ||
1da177e4 | 2798 | /* |
0804ef4b | 2799 | * Find the first task with tgid >= tgid |
0bc58a91 | 2800 | * |
1da177e4 | 2801 | */ |
19fd4bb2 EB |
2802 | struct tgid_iter { |
2803 | unsigned int tgid; | |
0804ef4b | 2804 | struct task_struct *task; |
19fd4bb2 EB |
2805 | }; |
2806 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2807 | { | |
0804ef4b | 2808 | struct pid *pid; |
1da177e4 | 2809 | |
19fd4bb2 EB |
2810 | if (iter.task) |
2811 | put_task_struct(iter.task); | |
454cc105 | 2812 | rcu_read_lock(); |
0804ef4b | 2813 | retry: |
19fd4bb2 EB |
2814 | iter.task = NULL; |
2815 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2816 | if (pid) { |
19fd4bb2 EB |
2817 | iter.tgid = pid_nr_ns(pid, ns); |
2818 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2819 | /* What we to know is if the pid we have find is the |
2820 | * pid of a thread_group_leader. Testing for task | |
2821 | * being a thread_group_leader is the obvious thing | |
2822 | * todo but there is a window when it fails, due to | |
2823 | * the pid transfer logic in de_thread. | |
2824 | * | |
2825 | * So we perform the straight forward test of seeing | |
2826 | * if the pid we have found is the pid of a thread | |
2827 | * group leader, and don't worry if the task we have | |
2828 | * found doesn't happen to be a thread group leader. | |
2829 | * As we don't care in the case of readdir. | |
2830 | */ | |
19fd4bb2 EB |
2831 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2832 | iter.tgid += 1; | |
0804ef4b | 2833 | goto retry; |
19fd4bb2 EB |
2834 | } |
2835 | get_task_struct(iter.task); | |
0bc58a91 | 2836 | } |
454cc105 | 2837 | rcu_read_unlock(); |
19fd4bb2 | 2838 | return iter; |
1da177e4 LT |
2839 | } |
2840 | ||
0097875b | 2841 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2) |
0804ef4b | 2842 | |
1da177e4 | 2843 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
f0c3b509 | 2844 | int proc_pid_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 2845 | { |
19fd4bb2 | 2846 | struct tgid_iter iter; |
3aa3377f | 2847 | struct pid_namespace *ns = file_inode(file)->i_sb->s_fs_info; |
f0c3b509 | 2848 | loff_t pos = ctx->pos; |
1da177e4 | 2849 | |
021ada7d | 2850 | if (pos >= PID_MAX_LIMIT + TGID_OFFSET) |
f0c3b509 | 2851 | return 0; |
1da177e4 | 2852 | |
0097875b | 2853 | if (pos == TGID_OFFSET - 2) { |
db963164 AV |
2854 | struct inode *inode = ns->proc_self->d_inode; |
2855 | if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) | |
f0c3b509 | 2856 | return 0; |
0097875b EB |
2857 | ctx->pos = pos = pos + 1; |
2858 | } | |
2859 | if (pos == TGID_OFFSET - 1) { | |
2860 | struct inode *inode = ns->proc_thread_self->d_inode; | |
2861 | if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK)) | |
2862 | return 0; | |
2863 | ctx->pos = pos = pos + 1; | |
021ada7d | 2864 | } |
0097875b | 2865 | iter.tgid = pos - TGID_OFFSET; |
19fd4bb2 | 2866 | iter.task = NULL; |
19fd4bb2 EB |
2867 | for (iter = next_tgid(ns, iter); |
2868 | iter.task; | |
2869 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
f0c3b509 AV |
2870 | char name[PROC_NUMBUF]; |
2871 | int len; | |
2872 | if (!has_pid_permissions(ns, iter.task, 2)) | |
2873 | continue; | |
0499680a | 2874 | |
f0c3b509 AV |
2875 | len = snprintf(name, sizeof(name), "%d", iter.tgid); |
2876 | ctx->pos = iter.tgid + TGID_OFFSET; | |
2877 | if (!proc_fill_cache(file, ctx, name, len, | |
2878 | proc_pid_instantiate, iter.task, NULL)) { | |
19fd4bb2 | 2879 | put_task_struct(iter.task); |
f0c3b509 | 2880 | return 0; |
1da177e4 | 2881 | } |
0bc58a91 | 2882 | } |
f0c3b509 | 2883 | ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; |
0bc58a91 EB |
2884 | return 0; |
2885 | } | |
1da177e4 | 2886 | |
28a6d671 EB |
2887 | /* |
2888 | * Tasks | |
2889 | */ | |
c5141e6d | 2890 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 2891 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 2892 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 2893 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
6ba8ed79 EB |
2894 | #ifdef CONFIG_NET |
2895 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), | |
2896 | #endif | |
631f9c18 | 2897 | REG("environ", S_IRUSR, proc_environ_operations), |
f9ea536e | 2898 | ONE("auxv", S_IRUSR, proc_pid_auxv), |
631f9c18 | 2899 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 2900 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 2901 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2902 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2903 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 2904 | #endif |
4614a696 | 2905 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2906 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 2907 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2908 | #endif |
2ca66ff7 | 2909 | ONE("cmdline", S_IRUGO, proc_pid_cmdline), |
631f9c18 AD |
2910 | ONE("stat", S_IRUGO, proc_tid_stat), |
2911 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 2912 | REG("maps", S_IRUGO, proc_tid_maps_operations), |
81841161 CG |
2913 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2914 | REG("children", S_IRUGO, proc_tid_children_operations), | |
2915 | #endif | |
28a6d671 | 2916 | #ifdef CONFIG_NUMA |
b7643757 | 2917 | REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), |
28a6d671 | 2918 | #endif |
631f9c18 AD |
2919 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2920 | LNK("cwd", proc_cwd_link), | |
2921 | LNK("root", proc_root_link), | |
2922 | LNK("exe", proc_exe_link), | |
2923 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2924 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 2925 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 2926 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 2927 | REG("smaps", S_IRUGO, proc_tid_smaps_operations), |
32ed74a4 | 2928 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
2929 | #endif |
2930 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2931 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2932 | #endif |
2933 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 2934 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2935 | #endif |
2ec220e2 | 2936 | #ifdef CONFIG_STACKTRACE |
35a35046 | 2937 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 EB |
2938 | #endif |
2939 | #ifdef CONFIG_SCHEDSTATS | |
f6e826ca | 2940 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2941 | #endif |
9745512c | 2942 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2943 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2944 | #endif |
8793d854 | 2945 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 2946 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
2947 | #endif |
2948 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 2949 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 2950 | #endif |
6ba51e37 | 2951 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 2952 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 2953 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2954 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 | 2955 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
26ec3c64 | 2956 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
28a6d671 | 2957 | #endif |
f4f154fd | 2958 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2959 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2960 | #endif |
297c5d92 | 2961 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2962 | ONE("io", S_IRUSR, proc_tid_io_accounting), |
297c5d92 | 2963 | #endif |
f133ecca | 2964 | #ifdef CONFIG_HARDWALL |
d962c144 | 2965 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 2966 | #endif |
22d917d8 EB |
2967 | #ifdef CONFIG_USER_NS |
2968 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
2969 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 2970 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 2971 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 2972 | #endif |
28a6d671 EB |
2973 | }; |
2974 | ||
f0c3b509 | 2975 | static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 2976 | { |
f0c3b509 AV |
2977 | return proc_pident_readdir(file, ctx, |
2978 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2979 | } |
2980 | ||
00cd8dd3 AV |
2981 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
2982 | { | |
7bcd6b0e EB |
2983 | return proc_pident_lookup(dir, dentry, |
2984 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2985 | } |
2986 | ||
00977a59 | 2987 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 | 2988 | .read = generic_read_dir, |
f0c3b509 | 2989 | .iterate = proc_tid_base_readdir, |
6038f373 | 2990 | .llseek = default_llseek, |
28a6d671 EB |
2991 | }; |
2992 | ||
c5ef1c42 | 2993 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2994 | .lookup = proc_tid_base_lookup, |
2995 | .getattr = pid_getattr, | |
2996 | .setattr = proc_setattr, | |
2997 | }; | |
2998 | ||
c52a47ac | 2999 | static int proc_task_instantiate(struct inode *dir, |
c5141e6d | 3000 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 3001 | { |
444ceed8 | 3002 | struct inode *inode; |
61a28784 | 3003 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3004 | |
3005 | if (!inode) | |
3006 | goto out; | |
3007 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3008 | inode->i_op = &proc_tid_base_inode_operations; | |
3009 | inode->i_fop = &proc_tid_base_operations; | |
3010 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3011 | |
bfe86848 MS |
3012 | set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, |
3013 | ARRAY_SIZE(tid_base_stuff))); | |
444ceed8 | 3014 | |
fb045adb | 3015 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3016 | |
3017 | d_add(dentry, inode); | |
3018 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3019 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3020 | return 0; |
444ceed8 | 3021 | out: |
c52a47ac | 3022 | return -ENOENT; |
444ceed8 EB |
3023 | } |
3024 | ||
00cd8dd3 | 3025 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
28a6d671 | 3026 | { |
c52a47ac | 3027 | int result = -ENOENT; |
28a6d671 EB |
3028 | struct task_struct *task; |
3029 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3030 | unsigned tid; |
b488893a | 3031 | struct pid_namespace *ns; |
28a6d671 EB |
3032 | |
3033 | if (!leader) | |
3034 | goto out_no_task; | |
3035 | ||
dbcdb504 | 3036 | tid = name_to_int(&dentry->d_name); |
28a6d671 EB |
3037 | if (tid == ~0U) |
3038 | goto out; | |
3039 | ||
b488893a | 3040 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3041 | rcu_read_lock(); |
b488893a | 3042 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3043 | if (task) |
3044 | get_task_struct(task); | |
3045 | rcu_read_unlock(); | |
3046 | if (!task) | |
3047 | goto out; | |
bac0abd6 | 3048 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3049 | goto out_drop_task; |
3050 | ||
444ceed8 | 3051 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3052 | out_drop_task: |
3053 | put_task_struct(task); | |
3054 | out: | |
3055 | put_task_struct(leader); | |
3056 | out_no_task: | |
c52a47ac | 3057 | return ERR_PTR(result); |
28a6d671 EB |
3058 | } |
3059 | ||
0bc58a91 EB |
3060 | /* |
3061 | * Find the first tid of a thread group to return to user space. | |
3062 | * | |
3063 | * Usually this is just the thread group leader, but if the users | |
3064 | * buffer was too small or there was a seek into the middle of the | |
3065 | * directory we have more work todo. | |
3066 | * | |
3067 | * In the case of a short read we start with find_task_by_pid. | |
3068 | * | |
3069 | * In the case of a seek we start with the leader and walk nr | |
3070 | * threads past it. | |
3071 | */ | |
9f6e963f ON |
3072 | static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, |
3073 | struct pid_namespace *ns) | |
0bc58a91 | 3074 | { |
d855a4b7 | 3075 | struct task_struct *pos, *task; |
9f6e963f ON |
3076 | unsigned long nr = f_pos; |
3077 | ||
3078 | if (nr != f_pos) /* 32bit overflow? */ | |
3079 | return NULL; | |
1da177e4 | 3080 | |
cc288738 | 3081 | rcu_read_lock(); |
d855a4b7 ON |
3082 | task = pid_task(pid, PIDTYPE_PID); |
3083 | if (!task) | |
3084 | goto fail; | |
3085 | ||
3086 | /* Attempt to start with the tid of a thread */ | |
9f6e963f | 3087 | if (tid && nr) { |
b488893a | 3088 | pos = find_task_by_pid_ns(tid, ns); |
d855a4b7 | 3089 | if (pos && same_thread_group(pos, task)) |
a872ff0c | 3090 | goto found; |
0bc58a91 | 3091 | } |
1da177e4 | 3092 | |
0bc58a91 | 3093 | /* If nr exceeds the number of threads there is nothing todo */ |
9f6e963f | 3094 | if (nr >= get_nr_threads(task)) |
c986c14a | 3095 | goto fail; |
1da177e4 | 3096 | |
a872ff0c ON |
3097 | /* If we haven't found our starting place yet start |
3098 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3099 | */ |
d855a4b7 | 3100 | pos = task = task->group_leader; |
c986c14a | 3101 | do { |
9f6e963f | 3102 | if (!nr--) |
c986c14a | 3103 | goto found; |
d855a4b7 | 3104 | } while_each_thread(task, pos); |
c986c14a ON |
3105 | fail: |
3106 | pos = NULL; | |
3107 | goto out; | |
a872ff0c ON |
3108 | found: |
3109 | get_task_struct(pos); | |
3110 | out: | |
cc288738 | 3111 | rcu_read_unlock(); |
0bc58a91 EB |
3112 | return pos; |
3113 | } | |
3114 | ||
3115 | /* | |
3116 | * Find the next thread in the thread list. | |
3117 | * Return NULL if there is an error or no next thread. | |
3118 | * | |
3119 | * The reference to the input task_struct is released. | |
3120 | */ | |
3121 | static struct task_struct *next_tid(struct task_struct *start) | |
3122 | { | |
c1df7fb8 | 3123 | struct task_struct *pos = NULL; |
cc288738 | 3124 | rcu_read_lock(); |
c1df7fb8 | 3125 | if (pid_alive(start)) { |
0bc58a91 | 3126 | pos = next_thread(start); |
c1df7fb8 ON |
3127 | if (thread_group_leader(pos)) |
3128 | pos = NULL; | |
3129 | else | |
3130 | get_task_struct(pos); | |
3131 | } | |
cc288738 | 3132 | rcu_read_unlock(); |
0bc58a91 EB |
3133 | put_task_struct(start); |
3134 | return pos; | |
1da177e4 LT |
3135 | } |
3136 | ||
3137 | /* for the /proc/TGID/task/ directories */ | |
f0c3b509 | 3138 | static int proc_task_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3139 | { |
d855a4b7 ON |
3140 | struct inode *inode = file_inode(file); |
3141 | struct task_struct *task; | |
b488893a | 3142 | struct pid_namespace *ns; |
f0c3b509 | 3143 | int tid; |
1da177e4 | 3144 | |
d855a4b7 | 3145 | if (proc_inode_is_dead(inode)) |
f0c3b509 | 3146 | return -ENOENT; |
1da177e4 | 3147 | |
f0c3b509 | 3148 | if (!dir_emit_dots(file, ctx)) |
d855a4b7 | 3149 | return 0; |
1da177e4 | 3150 | |
0bc58a91 EB |
3151 | /* f_version caches the tgid value that the last readdir call couldn't |
3152 | * return. lseek aka telldir automagically resets f_version to 0. | |
3153 | */ | |
3aa3377f | 3154 | ns = inode->i_sb->s_fs_info; |
f0c3b509 AV |
3155 | tid = (int)file->f_version; |
3156 | file->f_version = 0; | |
d855a4b7 | 3157 | for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); |
0bc58a91 | 3158 | task; |
f0c3b509 AV |
3159 | task = next_tid(task), ctx->pos++) { |
3160 | char name[PROC_NUMBUF]; | |
3161 | int len; | |
b488893a | 3162 | tid = task_pid_nr_ns(task, ns); |
f0c3b509 AV |
3163 | len = snprintf(name, sizeof(name), "%d", tid); |
3164 | if (!proc_fill_cache(file, ctx, name, len, | |
3165 | proc_task_instantiate, task, NULL)) { | |
0bc58a91 EB |
3166 | /* returning this tgid failed, save it as the first |
3167 | * pid for the next readir call */ | |
f0c3b509 | 3168 | file->f_version = (u64)tid; |
0bc58a91 | 3169 | put_task_struct(task); |
1da177e4 | 3170 | break; |
0bc58a91 | 3171 | } |
1da177e4 | 3172 | } |
d855a4b7 | 3173 | |
f0c3b509 | 3174 | return 0; |
1da177e4 | 3175 | } |
6e66b52b EB |
3176 | |
3177 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3178 | { | |
3179 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3180 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3181 | generic_fillattr(inode, stat); |
3182 | ||
99f89551 | 3183 | if (p) { |
99f89551 | 3184 | stat->nlink += get_nr_threads(p); |
99f89551 | 3185 | put_task_struct(p); |
6e66b52b EB |
3186 | } |
3187 | ||
3188 | return 0; | |
3189 | } | |
28a6d671 | 3190 | |
c5ef1c42 | 3191 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3192 | .lookup = proc_task_lookup, |
3193 | .getattr = proc_task_getattr, | |
3194 | .setattr = proc_setattr, | |
0499680a | 3195 | .permission = proc_pid_permission, |
28a6d671 EB |
3196 | }; |
3197 | ||
00977a59 | 3198 | static const struct file_operations proc_task_operations = { |
28a6d671 | 3199 | .read = generic_read_dir, |
f0c3b509 | 3200 | .iterate = proc_task_readdir, |
6038f373 | 3201 | .llseek = default_llseek, |
28a6d671 | 3202 | }; |