Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/binfmt_aout.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds | |
5 | */ | |
6 | ||
7 | #include <linux/module.h> | |
8 | ||
9 | #include <linux/time.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/mman.h> | |
13 | #include <linux/a.out.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/signal.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/file.h> | |
19 | #include <linux/stat.h> | |
20 | #include <linux/fcntl.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/user.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/binfmts.h> | |
25 | #include <linux/personality.h> | |
26 | #include <linux/init.h> | |
27 | ||
28 | #include <asm/system.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/cacheflush.h> | |
7fa30315 | 31 | #include <asm/a.out-core.h> |
1da177e4 LT |
32 | |
33 | static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs); | |
34 | static int load_aout_library(struct file*); | |
7dc0b22e | 35 | static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit); |
1da177e4 | 36 | |
1da177e4 LT |
37 | static struct linux_binfmt aout_format = { |
38 | .module = THIS_MODULE, | |
39 | .load_binary = load_aout_binary, | |
40 | .load_shlib = load_aout_library, | |
41 | .core_dump = aout_core_dump, | |
42 | .min_coredump = PAGE_SIZE | |
43 | }; | |
44 | ||
45 | #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) | |
46 | ||
47 | static int set_brk(unsigned long start, unsigned long end) | |
48 | { | |
49 | start = PAGE_ALIGN(start); | |
50 | end = PAGE_ALIGN(end); | |
51 | if (end > start) { | |
52 | unsigned long addr; | |
53 | down_write(¤t->mm->mmap_sem); | |
54 | addr = do_brk(start, end - start); | |
55 | up_write(¤t->mm->mmap_sem); | |
56 | if (BAD_ADDR(addr)) | |
57 | return addr; | |
58 | } | |
59 | return 0; | |
60 | } | |
61 | ||
62 | /* | |
63 | * These are the only things you should do on a core-file: use only these | |
64 | * macros to write out all the necessary info. | |
65 | */ | |
66 | ||
67 | static int dump_write(struct file *file, const void *addr, int nr) | |
68 | { | |
69 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; | |
70 | } | |
71 | ||
72 | #define DUMP_WRITE(addr, nr) \ | |
73 | if (!dump_write(file, (void *)(addr), (nr))) \ | |
74 | goto end_coredump; | |
75 | ||
76 | #define DUMP_SEEK(offset) \ | |
77 | if (file->f_op->llseek) { \ | |
78 | if (file->f_op->llseek(file,(offset),0) != (offset)) \ | |
79 | goto end_coredump; \ | |
80 | } else file->f_pos = (offset) | |
81 | ||
82 | /* | |
83 | * Routine writes a core dump image in the current directory. | |
84 | * Currently only a stub-function. | |
85 | * | |
86 | * Note that setuid/setgid files won't make a core-dump if the uid/gid | |
87 | * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable" | |
88 | * field, which also makes sure the core-dumps won't be recursive if the | |
89 | * dumping of the process results in another error.. | |
90 | */ | |
91 | ||
7dc0b22e | 92 | static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit) |
1da177e4 LT |
93 | { |
94 | mm_segment_t fs; | |
95 | int has_dumped = 0; | |
96 | unsigned long dump_start, dump_size; | |
97 | struct user dump; | |
98 | #if defined(__alpha__) | |
99 | # define START_DATA(u) (u.start_data) | |
100 | #elif defined(__arm__) | |
101 | # define START_DATA(u) ((u.u_tsize << PAGE_SHIFT) + u.start_code) | |
102 | #elif defined(__sparc__) | |
103 | # define START_DATA(u) (u.u_tsize) | |
104 | #elif defined(__i386__) || defined(__mc68000__) || defined(__arch_um__) | |
105 | # define START_DATA(u) (u.u_tsize << PAGE_SHIFT) | |
106 | #endif | |
107 | #ifdef __sparc__ | |
108 | # define START_STACK(u) ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1)) | |
109 | #else | |
110 | # define START_STACK(u) (u.start_stack) | |
111 | #endif | |
112 | ||
113 | fs = get_fs(); | |
114 | set_fs(KERNEL_DS); | |
115 | has_dumped = 1; | |
116 | current->flags |= PF_DUMPCORE; | |
117 | strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm)); | |
118 | #ifndef __sparc__ | |
6e16d89b | 119 | dump.u_ar0 = offsetof(struct user, regs); |
1da177e4 LT |
120 | #endif |
121 | dump.signal = signr; | |
7fa30315 | 122 | aout_dump_thread(regs, &dump); |
1da177e4 LT |
123 | |
124 | /* If the size of the dump file exceeds the rlimit, then see what would happen | |
125 | if we wrote the stack, but not the data area. */ | |
126 | #ifdef __sparc__ | |
7dc0b22e | 127 | if ((dump.u_dsize + dump.u_ssize) > limit) |
1da177e4 LT |
128 | dump.u_dsize = 0; |
129 | #else | |
7dc0b22e | 130 | if ((dump.u_dsize + dump.u_ssize+1) * PAGE_SIZE > limit) |
1da177e4 LT |
131 | dump.u_dsize = 0; |
132 | #endif | |
133 | ||
134 | /* Make sure we have enough room to write the stack and data areas. */ | |
135 | #ifdef __sparc__ | |
7dc0b22e | 136 | if (dump.u_ssize > limit) |
1da177e4 LT |
137 | dump.u_ssize = 0; |
138 | #else | |
7dc0b22e | 139 | if ((dump.u_ssize + 1) * PAGE_SIZE > limit) |
1da177e4 LT |
140 | dump.u_ssize = 0; |
141 | #endif | |
142 | ||
143 | /* make sure we actually have a data and stack area to dump */ | |
144 | set_fs(USER_DS); | |
145 | #ifdef __sparc__ | |
146 | if (!access_ok(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize)) | |
147 | dump.u_dsize = 0; | |
148 | if (!access_ok(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize)) | |
149 | dump.u_ssize = 0; | |
150 | #else | |
151 | if (!access_ok(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize << PAGE_SHIFT)) | |
152 | dump.u_dsize = 0; | |
153 | if (!access_ok(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize << PAGE_SHIFT)) | |
154 | dump.u_ssize = 0; | |
155 | #endif | |
156 | ||
157 | set_fs(KERNEL_DS); | |
158 | /* struct user */ | |
159 | DUMP_WRITE(&dump,sizeof(dump)); | |
160 | /* Now dump all of the user data. Include malloced stuff as well */ | |
161 | #ifndef __sparc__ | |
162 | DUMP_SEEK(PAGE_SIZE); | |
163 | #endif | |
164 | /* now we start writing out the user space info */ | |
165 | set_fs(USER_DS); | |
166 | /* Dump the data area */ | |
167 | if (dump.u_dsize != 0) { | |
168 | dump_start = START_DATA(dump); | |
169 | #ifdef __sparc__ | |
170 | dump_size = dump.u_dsize; | |
171 | #else | |
172 | dump_size = dump.u_dsize << PAGE_SHIFT; | |
173 | #endif | |
174 | DUMP_WRITE(dump_start,dump_size); | |
175 | } | |
176 | /* Now prepare to dump the stack area */ | |
177 | if (dump.u_ssize != 0) { | |
178 | dump_start = START_STACK(dump); | |
179 | #ifdef __sparc__ | |
180 | dump_size = dump.u_ssize; | |
181 | #else | |
182 | dump_size = dump.u_ssize << PAGE_SHIFT; | |
183 | #endif | |
184 | DUMP_WRITE(dump_start,dump_size); | |
185 | } | |
186 | /* Finally dump the task struct. Not be used by gdb, but could be useful */ | |
187 | set_fs(KERNEL_DS); | |
188 | DUMP_WRITE(current,sizeof(*current)); | |
189 | end_coredump: | |
190 | set_fs(fs); | |
191 | return has_dumped; | |
192 | } | |
193 | ||
194 | /* | |
195 | * create_aout_tables() parses the env- and arg-strings in new user | |
196 | * memory and creates the pointer tables from them, and puts their | |
197 | * addresses on the "stack", returning the new stack pointer value. | |
198 | */ | |
199 | static unsigned long __user *create_aout_tables(char __user *p, struct linux_binprm * bprm) | |
200 | { | |
201 | char __user * __user *argv; | |
202 | char __user * __user *envp; | |
203 | unsigned long __user *sp; | |
204 | int argc = bprm->argc; | |
205 | int envc = bprm->envc; | |
206 | ||
207 | sp = (void __user *)((-(unsigned long)sizeof(char *)) & (unsigned long) p); | |
208 | #ifdef __sparc__ | |
209 | /* This imposes the proper stack alignment for a new process. */ | |
210 | sp = (void __user *) (((unsigned long) sp) & ~7); | |
211 | if ((envc+argc+3)&1) --sp; | |
212 | #endif | |
213 | #ifdef __alpha__ | |
214 | /* whee.. test-programs are so much fun. */ | |
215 | put_user(0, --sp); | |
216 | put_user(0, --sp); | |
217 | if (bprm->loader) { | |
218 | put_user(0, --sp); | |
219 | put_user(0x3eb, --sp); | |
220 | put_user(bprm->loader, --sp); | |
221 | put_user(0x3ea, --sp); | |
222 | } | |
223 | put_user(bprm->exec, --sp); | |
224 | put_user(0x3e9, --sp); | |
225 | #endif | |
226 | sp -= envc+1; | |
227 | envp = (char __user * __user *) sp; | |
228 | sp -= argc+1; | |
229 | argv = (char __user * __user *) sp; | |
230 | #if defined(__i386__) || defined(__mc68000__) || defined(__arm__) || defined(__arch_um__) | |
231 | put_user((unsigned long) envp,--sp); | |
232 | put_user((unsigned long) argv,--sp); | |
233 | #endif | |
234 | put_user(argc,--sp); | |
235 | current->mm->arg_start = (unsigned long) p; | |
236 | while (argc-->0) { | |
237 | char c; | |
238 | put_user(p,argv++); | |
239 | do { | |
240 | get_user(c,p++); | |
241 | } while (c); | |
242 | } | |
243 | put_user(NULL,argv); | |
244 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; | |
245 | while (envc-->0) { | |
246 | char c; | |
247 | put_user(p,envp++); | |
248 | do { | |
249 | get_user(c,p++); | |
250 | } while (c); | |
251 | } | |
252 | put_user(NULL,envp); | |
253 | current->mm->env_end = (unsigned long) p; | |
254 | return sp; | |
255 | } | |
256 | ||
257 | /* | |
258 | * These are the functions used to load a.out style executables and shared | |
259 | * libraries. There is no binary dependent code anywhere else. | |
260 | */ | |
261 | ||
262 | static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs) | |
263 | { | |
264 | struct exec ex; | |
265 | unsigned long error; | |
266 | unsigned long fd_offset; | |
267 | unsigned long rlim; | |
268 | int retval; | |
269 | ||
270 | ex = *((struct exec *) bprm->buf); /* exec-header */ | |
271 | if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC && | |
272 | N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) || | |
273 | N_TRSIZE(ex) || N_DRSIZE(ex) || | |
0f7fc9e4 | 274 | i_size_read(bprm->file->f_path.dentry->d_inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { |
1da177e4 LT |
275 | return -ENOEXEC; |
276 | } | |
277 | ||
8454aeef ET |
278 | /* |
279 | * Requires a mmap handler. This prevents people from using a.out | |
280 | * as part of an exploit attack against /proc-related vulnerabilities. | |
281 | */ | |
282 | if (!bprm->file->f_op || !bprm->file->f_op->mmap) | |
283 | return -ENOEXEC; | |
284 | ||
1da177e4 LT |
285 | fd_offset = N_TXTOFF(ex); |
286 | ||
287 | /* Check initial limits. This avoids letting people circumvent | |
288 | * size limits imposed on them by creating programs with large | |
289 | * arrays in the data or bss. | |
290 | */ | |
291 | rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; | |
292 | if (rlim >= RLIM_INFINITY) | |
293 | rlim = ~0; | |
294 | if (ex.a_data + ex.a_bss > rlim) | |
295 | return -ENOMEM; | |
296 | ||
297 | /* Flush all traces of the currently running executable */ | |
298 | retval = flush_old_exec(bprm); | |
299 | if (retval) | |
300 | return retval; | |
301 | ||
302 | /* OK, This is the point of no return */ | |
303 | #if defined(__alpha__) | |
304 | SET_AOUT_PERSONALITY(bprm, ex); | |
305 | #elif defined(__sparc__) | |
306 | set_personality(PER_SUNOS); | |
307 | #if !defined(__sparc_v9__) | |
308 | memcpy(¤t->thread.core_exec, &ex, sizeof(struct exec)); | |
309 | #endif | |
310 | #else | |
311 | set_personality(PER_LINUX); | |
312 | #endif | |
313 | ||
314 | current->mm->end_code = ex.a_text + | |
315 | (current->mm->start_code = N_TXTADDR(ex)); | |
316 | current->mm->end_data = ex.a_data + | |
317 | (current->mm->start_data = N_DATADDR(ex)); | |
318 | current->mm->brk = ex.a_bss + | |
319 | (current->mm->start_brk = N_BSSADDR(ex)); | |
320 | current->mm->free_area_cache = current->mm->mmap_base; | |
1363c3cd | 321 | current->mm->cached_hole_size = 0; |
1da177e4 | 322 | |
1da177e4 LT |
323 | compute_creds(bprm); |
324 | current->flags &= ~PF_FORKNOEXEC; | |
325 | #ifdef __sparc__ | |
326 | if (N_MAGIC(ex) == NMAGIC) { | |
327 | loff_t pos = fd_offset; | |
328 | /* Fuck me plenty... */ | |
329 | /* <AOL></AOL> */ | |
330 | down_write(¤t->mm->mmap_sem); | |
331 | error = do_brk(N_TXTADDR(ex), ex.a_text); | |
332 | up_write(¤t->mm->mmap_sem); | |
333 | bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex), | |
334 | ex.a_text, &pos); | |
335 | down_write(¤t->mm->mmap_sem); | |
336 | error = do_brk(N_DATADDR(ex), ex.a_data); | |
337 | up_write(¤t->mm->mmap_sem); | |
338 | bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex), | |
339 | ex.a_data, &pos); | |
340 | goto beyond_if; | |
341 | } | |
342 | #endif | |
343 | ||
344 | if (N_MAGIC(ex) == OMAGIC) { | |
345 | unsigned long text_addr, map_size; | |
346 | loff_t pos; | |
347 | ||
348 | text_addr = N_TXTADDR(ex); | |
349 | ||
350 | #if defined(__alpha__) || defined(__sparc__) | |
351 | pos = fd_offset; | |
352 | map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1; | |
353 | #else | |
354 | pos = 32; | |
355 | map_size = ex.a_text+ex.a_data; | |
356 | #endif | |
357 | down_write(¤t->mm->mmap_sem); | |
358 | error = do_brk(text_addr & PAGE_MASK, map_size); | |
359 | up_write(¤t->mm->mmap_sem); | |
360 | if (error != (text_addr & PAGE_MASK)) { | |
361 | send_sig(SIGKILL, current, 0); | |
362 | return error; | |
363 | } | |
364 | ||
365 | error = bprm->file->f_op->read(bprm->file, | |
366 | (char __user *)text_addr, | |
367 | ex.a_text+ex.a_data, &pos); | |
368 | if ((signed long)error < 0) { | |
369 | send_sig(SIGKILL, current, 0); | |
370 | return error; | |
371 | } | |
372 | ||
373 | flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data); | |
374 | } else { | |
1da177e4 | 375 | if ((ex.a_text & 0xfff || ex.a_data & 0xfff) && |
2e50b6cc | 376 | (N_MAGIC(ex) != NMAGIC) && printk_ratelimit()) |
1da177e4 LT |
377 | { |
378 | printk(KERN_NOTICE "executable not page aligned\n"); | |
1da177e4 LT |
379 | } |
380 | ||
2e50b6cc | 381 | if ((fd_offset & ~PAGE_MASK) != 0 && printk_ratelimit()) |
1da177e4 LT |
382 | { |
383 | printk(KERN_WARNING | |
384 | "fd_offset is not page aligned. Please convert program: %s\n", | |
0f7fc9e4 | 385 | bprm->file->f_path.dentry->d_name.name); |
1da177e4 LT |
386 | } |
387 | ||
388 | if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) { | |
389 | loff_t pos = fd_offset; | |
390 | down_write(¤t->mm->mmap_sem); | |
391 | do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data); | |
392 | up_write(¤t->mm->mmap_sem); | |
393 | bprm->file->f_op->read(bprm->file, | |
394 | (char __user *)N_TXTADDR(ex), | |
395 | ex.a_text+ex.a_data, &pos); | |
396 | flush_icache_range((unsigned long) N_TXTADDR(ex), | |
397 | (unsigned long) N_TXTADDR(ex) + | |
398 | ex.a_text+ex.a_data); | |
399 | goto beyond_if; | |
400 | } | |
401 | ||
402 | down_write(¤t->mm->mmap_sem); | |
403 | error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text, | |
404 | PROT_READ | PROT_EXEC, | |
405 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE, | |
406 | fd_offset); | |
407 | up_write(¤t->mm->mmap_sem); | |
408 | ||
409 | if (error != N_TXTADDR(ex)) { | |
410 | send_sig(SIGKILL, current, 0); | |
411 | return error; | |
412 | } | |
413 | ||
414 | down_write(¤t->mm->mmap_sem); | |
415 | error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data, | |
416 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
417 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE, | |
418 | fd_offset + ex.a_text); | |
419 | up_write(¤t->mm->mmap_sem); | |
420 | if (error != N_DATADDR(ex)) { | |
421 | send_sig(SIGKILL, current, 0); | |
422 | return error; | |
423 | } | |
424 | } | |
425 | beyond_if: | |
426 | set_binfmt(&aout_format); | |
427 | ||
428 | retval = set_brk(current->mm->start_brk, current->mm->brk); | |
429 | if (retval < 0) { | |
430 | send_sig(SIGKILL, current, 0); | |
431 | return retval; | |
432 | } | |
433 | ||
434 | retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); | |
435 | if (retval < 0) { | |
436 | /* Someone check-me: is this error path enough? */ | |
437 | send_sig(SIGKILL, current, 0); | |
438 | return retval; | |
439 | } | |
440 | ||
441 | current->mm->start_stack = | |
442 | (unsigned long) create_aout_tables((char __user *) bprm->p, bprm); | |
443 | #ifdef __alpha__ | |
444 | regs->gp = ex.a_gpvalue; | |
445 | #endif | |
446 | start_thread(regs, ex.a_entry, current->mm->start_stack); | |
447 | if (unlikely(current->ptrace & PT_PTRACED)) { | |
448 | if (current->ptrace & PT_TRACE_EXEC) | |
449 | ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP); | |
450 | else | |
451 | send_sig(SIGTRAP, current, 0); | |
452 | } | |
453 | return 0; | |
454 | } | |
455 | ||
456 | static int load_aout_library(struct file *file) | |
457 | { | |
458 | struct inode * inode; | |
459 | unsigned long bss, start_addr, len; | |
460 | unsigned long error; | |
461 | int retval; | |
462 | struct exec ex; | |
463 | ||
0f7fc9e4 | 464 | inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
465 | |
466 | retval = -ENOEXEC; | |
467 | error = kernel_read(file, 0, (char *) &ex, sizeof(ex)); | |
468 | if (error != sizeof(ex)) | |
469 | goto out; | |
470 | ||
471 | /* We come in here for the regular a.out style of shared libraries */ | |
472 | if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) || | |
473 | N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) || | |
474 | i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { | |
475 | goto out; | |
476 | } | |
477 | ||
8454aeef ET |
478 | /* |
479 | * Requires a mmap handler. This prevents people from using a.out | |
480 | * as part of an exploit attack against /proc-related vulnerabilities. | |
481 | */ | |
482 | if (!file->f_op || !file->f_op->mmap) | |
483 | goto out; | |
484 | ||
1da177e4 LT |
485 | if (N_FLAGS(ex)) |
486 | goto out; | |
487 | ||
488 | /* For QMAGIC, the starting address is 0x20 into the page. We mask | |
489 | this off to get the starting address for the page */ | |
490 | ||
491 | start_addr = ex.a_entry & 0xfffff000; | |
492 | ||
493 | if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) { | |
1da177e4 LT |
494 | loff_t pos = N_TXTOFF(ex); |
495 | ||
2e50b6cc | 496 | if (printk_ratelimit()) |
1da177e4 LT |
497 | { |
498 | printk(KERN_WARNING | |
499 | "N_TXTOFF is not page aligned. Please convert library: %s\n", | |
0f7fc9e4 | 500 | file->f_path.dentry->d_name.name); |
1da177e4 LT |
501 | } |
502 | down_write(¤t->mm->mmap_sem); | |
503 | do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss); | |
504 | up_write(¤t->mm->mmap_sem); | |
505 | ||
506 | file->f_op->read(file, (char __user *)start_addr, | |
507 | ex.a_text + ex.a_data, &pos); | |
508 | flush_icache_range((unsigned long) start_addr, | |
509 | (unsigned long) start_addr + ex.a_text + ex.a_data); | |
510 | ||
511 | retval = 0; | |
512 | goto out; | |
513 | } | |
514 | /* Now use mmap to map the library into memory. */ | |
515 | down_write(¤t->mm->mmap_sem); | |
516 | error = do_mmap(file, start_addr, ex.a_text + ex.a_data, | |
517 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
518 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, | |
519 | N_TXTOFF(ex)); | |
520 | up_write(¤t->mm->mmap_sem); | |
521 | retval = error; | |
522 | if (error != start_addr) | |
523 | goto out; | |
524 | ||
525 | len = PAGE_ALIGN(ex.a_text + ex.a_data); | |
526 | bss = ex.a_text + ex.a_data + ex.a_bss; | |
527 | if (bss > len) { | |
528 | down_write(¤t->mm->mmap_sem); | |
529 | error = do_brk(start_addr + len, bss - len); | |
530 | up_write(¤t->mm->mmap_sem); | |
531 | retval = error; | |
532 | if (error != start_addr + len) | |
533 | goto out; | |
534 | } | |
535 | retval = 0; | |
536 | out: | |
537 | return retval; | |
538 | } | |
539 | ||
540 | static int __init init_aout_binfmt(void) | |
541 | { | |
542 | return register_binfmt(&aout_format); | |
543 | } | |
544 | ||
545 | static void __exit exit_aout_binfmt(void) | |
546 | { | |
547 | unregister_binfmt(&aout_format); | |
548 | } | |
549 | ||
550 | core_initcall(init_aout_binfmt); | |
551 | module_exit(exit_aout_binfmt); | |
552 | MODULE_LICENSE("GPL"); |