| 1 | /* |
| 2 | * sysctl.c: General linux system control interface |
| 3 | * |
| 4 | * Begun 24 March 1995, Stephen Tweedie |
| 5 | * Added /proc support, Dec 1995 |
| 6 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. |
| 7 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. |
| 8 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. |
| 9 | * Dynamic registration fixes, Stephen Tweedie. |
| 10 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. |
| 11 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris |
| 12 | * Horn. |
| 13 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. |
| 14 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. |
| 15 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill |
| 16 | * Wendling. |
| 17 | * The list_for_each() macro wasn't appropriate for the sysctl loop. |
| 18 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling |
| 19 | */ |
| 20 | |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/swap.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/sysctl.h> |
| 26 | #include <linux/proc_fs.h> |
| 27 | #include <linux/security.h> |
| 28 | #include <linux/ctype.h> |
| 29 | #include <linux/utsname.h> |
| 30 | #include <linux/smp_lock.h> |
| 31 | #include <linux/fs.h> |
| 32 | #include <linux/init.h> |
| 33 | #include <linux/kernel.h> |
| 34 | #include <linux/kobject.h> |
| 35 | #include <linux/net.h> |
| 36 | #include <linux/sysrq.h> |
| 37 | #include <linux/highuid.h> |
| 38 | #include <linux/writeback.h> |
| 39 | #include <linux/hugetlb.h> |
| 40 | #include <linux/initrd.h> |
| 41 | #include <linux/key.h> |
| 42 | #include <linux/times.h> |
| 43 | #include <linux/limits.h> |
| 44 | #include <linux/dcache.h> |
| 45 | #include <linux/syscalls.h> |
| 46 | #include <linux/vmstat.h> |
| 47 | #include <linux/nfs_fs.h> |
| 48 | #include <linux/acpi.h> |
| 49 | #include <linux/reboot.h> |
| 50 | #include <linux/ftrace.h> |
| 51 | |
| 52 | #include <asm/uaccess.h> |
| 53 | #include <asm/processor.h> |
| 54 | |
| 55 | #ifdef CONFIG_X86 |
| 56 | #include <asm/nmi.h> |
| 57 | #include <asm/stacktrace.h> |
| 58 | #include <asm/io.h> |
| 59 | #endif |
| 60 | |
| 61 | static int deprecated_sysctl_warning(struct __sysctl_args *args); |
| 62 | |
| 63 | #if defined(CONFIG_SYSCTL) |
| 64 | |
| 65 | /* External variables not in a header file. */ |
| 66 | extern int C_A_D; |
| 67 | extern int print_fatal_signals; |
| 68 | extern int sysctl_overcommit_memory; |
| 69 | extern int sysctl_overcommit_ratio; |
| 70 | extern int sysctl_panic_on_oom; |
| 71 | extern int sysctl_oom_kill_allocating_task; |
| 72 | extern int sysctl_oom_dump_tasks; |
| 73 | extern int max_threads; |
| 74 | extern int core_uses_pid; |
| 75 | extern int suid_dumpable; |
| 76 | extern char core_pattern[]; |
| 77 | extern int pid_max; |
| 78 | extern int min_free_kbytes; |
| 79 | extern int pid_max_min, pid_max_max; |
| 80 | extern int sysctl_drop_caches; |
| 81 | extern int percpu_pagelist_fraction; |
| 82 | extern int compat_log; |
| 83 | extern int latencytop_enabled; |
| 84 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
| 85 | #ifdef CONFIG_RCU_TORTURE_TEST |
| 86 | extern int rcutorture_runnable; |
| 87 | #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ |
| 88 | |
| 89 | /* Constants used for minimum and maximum */ |
| 90 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP) |
| 91 | static int one = 1; |
| 92 | #endif |
| 93 | |
| 94 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
| 95 | static int sixty = 60; |
| 96 | static int neg_one = -1; |
| 97 | #endif |
| 98 | |
| 99 | #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING) |
| 100 | static int two = 2; |
| 101 | #endif |
| 102 | |
| 103 | static int zero; |
| 104 | static int one_hundred = 100; |
| 105 | |
| 106 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
| 107 | static int maxolduid = 65535; |
| 108 | static int minolduid; |
| 109 | static int min_percpu_pagelist_fract = 8; |
| 110 | |
| 111 | static int ngroups_max = NGROUPS_MAX; |
| 112 | |
| 113 | #ifdef CONFIG_MODULES |
| 114 | extern char modprobe_path[]; |
| 115 | #endif |
| 116 | #ifdef CONFIG_CHR_DEV_SG |
| 117 | extern int sg_big_buff; |
| 118 | #endif |
| 119 | |
| 120 | #ifdef CONFIG_SPARC |
| 121 | #include <asm/system.h> |
| 122 | #endif |
| 123 | |
| 124 | #ifdef __hppa__ |
| 125 | extern int pwrsw_enabled; |
| 126 | extern int unaligned_enabled; |
| 127 | #endif |
| 128 | |
| 129 | #ifdef CONFIG_S390 |
| 130 | #ifdef CONFIG_MATHEMU |
| 131 | extern int sysctl_ieee_emulation_warnings; |
| 132 | #endif |
| 133 | extern int sysctl_userprocess_debug; |
| 134 | extern int spin_retry; |
| 135 | #endif |
| 136 | |
| 137 | #ifdef CONFIG_BSD_PROCESS_ACCT |
| 138 | extern int acct_parm[]; |
| 139 | #endif |
| 140 | |
| 141 | #ifdef CONFIG_IA64 |
| 142 | extern int no_unaligned_warning; |
| 143 | #endif |
| 144 | |
| 145 | #ifdef CONFIG_RT_MUTEXES |
| 146 | extern int max_lock_depth; |
| 147 | #endif |
| 148 | |
| 149 | #ifdef CONFIG_PROC_SYSCTL |
| 150 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
| 151 | void __user *buffer, size_t *lenp, loff_t *ppos); |
| 152 | static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, |
| 153 | void __user *buffer, size_t *lenp, loff_t *ppos); |
| 154 | #endif |
| 155 | |
| 156 | static struct ctl_table root_table[]; |
| 157 | static struct ctl_table_root sysctl_table_root; |
| 158 | static struct ctl_table_header root_table_header = { |
| 159 | .count = 1, |
| 160 | .ctl_table = root_table, |
| 161 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), |
| 162 | .root = &sysctl_table_root, |
| 163 | .set = &sysctl_table_root.default_set, |
| 164 | }; |
| 165 | static struct ctl_table_root sysctl_table_root = { |
| 166 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), |
| 167 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
| 168 | }; |
| 169 | |
| 170 | static struct ctl_table kern_table[]; |
| 171 | static struct ctl_table vm_table[]; |
| 172 | static struct ctl_table fs_table[]; |
| 173 | static struct ctl_table debug_table[]; |
| 174 | static struct ctl_table dev_table[]; |
| 175 | extern struct ctl_table random_table[]; |
| 176 | #ifdef CONFIG_INOTIFY_USER |
| 177 | extern struct ctl_table inotify_table[]; |
| 178 | #endif |
| 179 | |
| 180 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
| 181 | int sysctl_legacy_va_layout; |
| 182 | #endif |
| 183 | |
| 184 | extern int prove_locking; |
| 185 | extern int lock_stat; |
| 186 | |
| 187 | /* The default sysctl tables: */ |
| 188 | |
| 189 | static struct ctl_table root_table[] = { |
| 190 | { |
| 191 | .ctl_name = CTL_KERN, |
| 192 | .procname = "kernel", |
| 193 | .mode = 0555, |
| 194 | .child = kern_table, |
| 195 | }, |
| 196 | { |
| 197 | .ctl_name = CTL_VM, |
| 198 | .procname = "vm", |
| 199 | .mode = 0555, |
| 200 | .child = vm_table, |
| 201 | }, |
| 202 | { |
| 203 | .ctl_name = CTL_FS, |
| 204 | .procname = "fs", |
| 205 | .mode = 0555, |
| 206 | .child = fs_table, |
| 207 | }, |
| 208 | { |
| 209 | .ctl_name = CTL_DEBUG, |
| 210 | .procname = "debug", |
| 211 | .mode = 0555, |
| 212 | .child = debug_table, |
| 213 | }, |
| 214 | { |
| 215 | .ctl_name = CTL_DEV, |
| 216 | .procname = "dev", |
| 217 | .mode = 0555, |
| 218 | .child = dev_table, |
| 219 | }, |
| 220 | /* |
| 221 | * NOTE: do not add new entries to this table unless you have read |
| 222 | * Documentation/sysctl/ctl_unnumbered.txt |
| 223 | */ |
| 224 | { .ctl_name = 0 } |
| 225 | }; |
| 226 | |
| 227 | #ifdef CONFIG_SCHED_DEBUG |
| 228 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
| 229 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ |
| 230 | static int min_wakeup_granularity_ns; /* 0 usecs */ |
| 231 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ |
| 232 | #endif |
| 233 | |
| 234 | static struct ctl_table kern_table[] = { |
| 235 | #ifdef CONFIG_SCHED_DEBUG |
| 236 | { |
| 237 | .ctl_name = CTL_UNNUMBERED, |
| 238 | .procname = "sched_min_granularity_ns", |
| 239 | .data = &sysctl_sched_min_granularity, |
| 240 | .maxlen = sizeof(unsigned int), |
| 241 | .mode = 0644, |
| 242 | .proc_handler = &sched_nr_latency_handler, |
| 243 | .strategy = &sysctl_intvec, |
| 244 | .extra1 = &min_sched_granularity_ns, |
| 245 | .extra2 = &max_sched_granularity_ns, |
| 246 | }, |
| 247 | { |
| 248 | .ctl_name = CTL_UNNUMBERED, |
| 249 | .procname = "sched_latency_ns", |
| 250 | .data = &sysctl_sched_latency, |
| 251 | .maxlen = sizeof(unsigned int), |
| 252 | .mode = 0644, |
| 253 | .proc_handler = &sched_nr_latency_handler, |
| 254 | .strategy = &sysctl_intvec, |
| 255 | .extra1 = &min_sched_granularity_ns, |
| 256 | .extra2 = &max_sched_granularity_ns, |
| 257 | }, |
| 258 | { |
| 259 | .ctl_name = CTL_UNNUMBERED, |
| 260 | .procname = "sched_wakeup_granularity_ns", |
| 261 | .data = &sysctl_sched_wakeup_granularity, |
| 262 | .maxlen = sizeof(unsigned int), |
| 263 | .mode = 0644, |
| 264 | .proc_handler = &proc_dointvec_minmax, |
| 265 | .strategy = &sysctl_intvec, |
| 266 | .extra1 = &min_wakeup_granularity_ns, |
| 267 | .extra2 = &max_wakeup_granularity_ns, |
| 268 | }, |
| 269 | { |
| 270 | .ctl_name = CTL_UNNUMBERED, |
| 271 | .procname = "sched_shares_ratelimit", |
| 272 | .data = &sysctl_sched_shares_ratelimit, |
| 273 | .maxlen = sizeof(unsigned int), |
| 274 | .mode = 0644, |
| 275 | .proc_handler = &proc_dointvec, |
| 276 | }, |
| 277 | { |
| 278 | .ctl_name = CTL_UNNUMBERED, |
| 279 | .procname = "sched_child_runs_first", |
| 280 | .data = &sysctl_sched_child_runs_first, |
| 281 | .maxlen = sizeof(unsigned int), |
| 282 | .mode = 0644, |
| 283 | .proc_handler = &proc_dointvec, |
| 284 | }, |
| 285 | { |
| 286 | .ctl_name = CTL_UNNUMBERED, |
| 287 | .procname = "sched_features", |
| 288 | .data = &sysctl_sched_features, |
| 289 | .maxlen = sizeof(unsigned int), |
| 290 | .mode = 0644, |
| 291 | .proc_handler = &proc_dointvec, |
| 292 | }, |
| 293 | { |
| 294 | .ctl_name = CTL_UNNUMBERED, |
| 295 | .procname = "sched_migration_cost", |
| 296 | .data = &sysctl_sched_migration_cost, |
| 297 | .maxlen = sizeof(unsigned int), |
| 298 | .mode = 0644, |
| 299 | .proc_handler = &proc_dointvec, |
| 300 | }, |
| 301 | { |
| 302 | .ctl_name = CTL_UNNUMBERED, |
| 303 | .procname = "sched_nr_migrate", |
| 304 | .data = &sysctl_sched_nr_migrate, |
| 305 | .maxlen = sizeof(unsigned int), |
| 306 | .mode = 0644, |
| 307 | .proc_handler = &proc_dointvec, |
| 308 | }, |
| 309 | #endif |
| 310 | { |
| 311 | .ctl_name = CTL_UNNUMBERED, |
| 312 | .procname = "sched_rt_period_us", |
| 313 | .data = &sysctl_sched_rt_period, |
| 314 | .maxlen = sizeof(unsigned int), |
| 315 | .mode = 0644, |
| 316 | .proc_handler = &sched_rt_handler, |
| 317 | }, |
| 318 | { |
| 319 | .ctl_name = CTL_UNNUMBERED, |
| 320 | .procname = "sched_rt_runtime_us", |
| 321 | .data = &sysctl_sched_rt_runtime, |
| 322 | .maxlen = sizeof(int), |
| 323 | .mode = 0644, |
| 324 | .proc_handler = &sched_rt_handler, |
| 325 | }, |
| 326 | { |
| 327 | .ctl_name = CTL_UNNUMBERED, |
| 328 | .procname = "sched_compat_yield", |
| 329 | .data = &sysctl_sched_compat_yield, |
| 330 | .maxlen = sizeof(unsigned int), |
| 331 | .mode = 0644, |
| 332 | .proc_handler = &proc_dointvec, |
| 333 | }, |
| 334 | #ifdef CONFIG_PROVE_LOCKING |
| 335 | { |
| 336 | .ctl_name = CTL_UNNUMBERED, |
| 337 | .procname = "prove_locking", |
| 338 | .data = &prove_locking, |
| 339 | .maxlen = sizeof(int), |
| 340 | .mode = 0644, |
| 341 | .proc_handler = &proc_dointvec, |
| 342 | }, |
| 343 | #endif |
| 344 | #ifdef CONFIG_LOCK_STAT |
| 345 | { |
| 346 | .ctl_name = CTL_UNNUMBERED, |
| 347 | .procname = "lock_stat", |
| 348 | .data = &lock_stat, |
| 349 | .maxlen = sizeof(int), |
| 350 | .mode = 0644, |
| 351 | .proc_handler = &proc_dointvec, |
| 352 | }, |
| 353 | #endif |
| 354 | { |
| 355 | .ctl_name = KERN_PANIC, |
| 356 | .procname = "panic", |
| 357 | .data = &panic_timeout, |
| 358 | .maxlen = sizeof(int), |
| 359 | .mode = 0644, |
| 360 | .proc_handler = &proc_dointvec, |
| 361 | }, |
| 362 | { |
| 363 | .ctl_name = KERN_CORE_USES_PID, |
| 364 | .procname = "core_uses_pid", |
| 365 | .data = &core_uses_pid, |
| 366 | .maxlen = sizeof(int), |
| 367 | .mode = 0644, |
| 368 | .proc_handler = &proc_dointvec, |
| 369 | }, |
| 370 | { |
| 371 | .ctl_name = KERN_CORE_PATTERN, |
| 372 | .procname = "core_pattern", |
| 373 | .data = core_pattern, |
| 374 | .maxlen = CORENAME_MAX_SIZE, |
| 375 | .mode = 0644, |
| 376 | .proc_handler = &proc_dostring, |
| 377 | .strategy = &sysctl_string, |
| 378 | }, |
| 379 | #ifdef CONFIG_PROC_SYSCTL |
| 380 | { |
| 381 | .procname = "tainted", |
| 382 | .data = &tainted, |
| 383 | .maxlen = sizeof(int), |
| 384 | .mode = 0644, |
| 385 | .proc_handler = &proc_dointvec_taint, |
| 386 | }, |
| 387 | #endif |
| 388 | #ifdef CONFIG_LATENCYTOP |
| 389 | { |
| 390 | .procname = "latencytop", |
| 391 | .data = &latencytop_enabled, |
| 392 | .maxlen = sizeof(int), |
| 393 | .mode = 0644, |
| 394 | .proc_handler = &proc_dointvec, |
| 395 | }, |
| 396 | #endif |
| 397 | #ifdef CONFIG_BLK_DEV_INITRD |
| 398 | { |
| 399 | .ctl_name = KERN_REALROOTDEV, |
| 400 | .procname = "real-root-dev", |
| 401 | .data = &real_root_dev, |
| 402 | .maxlen = sizeof(int), |
| 403 | .mode = 0644, |
| 404 | .proc_handler = &proc_dointvec, |
| 405 | }, |
| 406 | #endif |
| 407 | { |
| 408 | .ctl_name = CTL_UNNUMBERED, |
| 409 | .procname = "print-fatal-signals", |
| 410 | .data = &print_fatal_signals, |
| 411 | .maxlen = sizeof(int), |
| 412 | .mode = 0644, |
| 413 | .proc_handler = &proc_dointvec, |
| 414 | }, |
| 415 | #ifdef CONFIG_SPARC |
| 416 | { |
| 417 | .ctl_name = KERN_SPARC_REBOOT, |
| 418 | .procname = "reboot-cmd", |
| 419 | .data = reboot_command, |
| 420 | .maxlen = 256, |
| 421 | .mode = 0644, |
| 422 | .proc_handler = &proc_dostring, |
| 423 | .strategy = &sysctl_string, |
| 424 | }, |
| 425 | { |
| 426 | .ctl_name = KERN_SPARC_STOP_A, |
| 427 | .procname = "stop-a", |
| 428 | .data = &stop_a_enabled, |
| 429 | .maxlen = sizeof (int), |
| 430 | .mode = 0644, |
| 431 | .proc_handler = &proc_dointvec, |
| 432 | }, |
| 433 | { |
| 434 | .ctl_name = KERN_SPARC_SCONS_PWROFF, |
| 435 | .procname = "scons-poweroff", |
| 436 | .data = &scons_pwroff, |
| 437 | .maxlen = sizeof (int), |
| 438 | .mode = 0644, |
| 439 | .proc_handler = &proc_dointvec, |
| 440 | }, |
| 441 | #endif |
| 442 | #ifdef __hppa__ |
| 443 | { |
| 444 | .ctl_name = KERN_HPPA_PWRSW, |
| 445 | .procname = "soft-power", |
| 446 | .data = &pwrsw_enabled, |
| 447 | .maxlen = sizeof (int), |
| 448 | .mode = 0644, |
| 449 | .proc_handler = &proc_dointvec, |
| 450 | }, |
| 451 | { |
| 452 | .ctl_name = KERN_HPPA_UNALIGNED, |
| 453 | .procname = "unaligned-trap", |
| 454 | .data = &unaligned_enabled, |
| 455 | .maxlen = sizeof (int), |
| 456 | .mode = 0644, |
| 457 | .proc_handler = &proc_dointvec, |
| 458 | }, |
| 459 | #endif |
| 460 | { |
| 461 | .ctl_name = KERN_CTLALTDEL, |
| 462 | .procname = "ctrl-alt-del", |
| 463 | .data = &C_A_D, |
| 464 | .maxlen = sizeof(int), |
| 465 | .mode = 0644, |
| 466 | .proc_handler = &proc_dointvec, |
| 467 | }, |
| 468 | #ifdef CONFIG_FTRACE |
| 469 | { |
| 470 | .ctl_name = CTL_UNNUMBERED, |
| 471 | .procname = "ftrace_enabled", |
| 472 | .data = &ftrace_enabled, |
| 473 | .maxlen = sizeof(int), |
| 474 | .mode = 0644, |
| 475 | .proc_handler = &ftrace_enable_sysctl, |
| 476 | }, |
| 477 | #endif |
| 478 | #ifdef CONFIG_MODULES |
| 479 | { |
| 480 | .ctl_name = KERN_MODPROBE, |
| 481 | .procname = "modprobe", |
| 482 | .data = &modprobe_path, |
| 483 | .maxlen = KMOD_PATH_LEN, |
| 484 | .mode = 0644, |
| 485 | .proc_handler = &proc_dostring, |
| 486 | .strategy = &sysctl_string, |
| 487 | }, |
| 488 | #endif |
| 489 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
| 490 | { |
| 491 | .ctl_name = KERN_HOTPLUG, |
| 492 | .procname = "hotplug", |
| 493 | .data = &uevent_helper, |
| 494 | .maxlen = UEVENT_HELPER_PATH_LEN, |
| 495 | .mode = 0644, |
| 496 | .proc_handler = &proc_dostring, |
| 497 | .strategy = &sysctl_string, |
| 498 | }, |
| 499 | #endif |
| 500 | #ifdef CONFIG_CHR_DEV_SG |
| 501 | { |
| 502 | .ctl_name = KERN_SG_BIG_BUFF, |
| 503 | .procname = "sg-big-buff", |
| 504 | .data = &sg_big_buff, |
| 505 | .maxlen = sizeof (int), |
| 506 | .mode = 0444, |
| 507 | .proc_handler = &proc_dointvec, |
| 508 | }, |
| 509 | #endif |
| 510 | #ifdef CONFIG_BSD_PROCESS_ACCT |
| 511 | { |
| 512 | .ctl_name = KERN_ACCT, |
| 513 | .procname = "acct", |
| 514 | .data = &acct_parm, |
| 515 | .maxlen = 3*sizeof(int), |
| 516 | .mode = 0644, |
| 517 | .proc_handler = &proc_dointvec, |
| 518 | }, |
| 519 | #endif |
| 520 | #ifdef CONFIG_MAGIC_SYSRQ |
| 521 | { |
| 522 | .ctl_name = KERN_SYSRQ, |
| 523 | .procname = "sysrq", |
| 524 | .data = &__sysrq_enabled, |
| 525 | .maxlen = sizeof (int), |
| 526 | .mode = 0644, |
| 527 | .proc_handler = &proc_dointvec, |
| 528 | }, |
| 529 | #endif |
| 530 | #ifdef CONFIG_PROC_SYSCTL |
| 531 | { |
| 532 | .procname = "cad_pid", |
| 533 | .data = NULL, |
| 534 | .maxlen = sizeof (int), |
| 535 | .mode = 0600, |
| 536 | .proc_handler = &proc_do_cad_pid, |
| 537 | }, |
| 538 | #endif |
| 539 | { |
| 540 | .ctl_name = KERN_MAX_THREADS, |
| 541 | .procname = "threads-max", |
| 542 | .data = &max_threads, |
| 543 | .maxlen = sizeof(int), |
| 544 | .mode = 0644, |
| 545 | .proc_handler = &proc_dointvec, |
| 546 | }, |
| 547 | { |
| 548 | .ctl_name = KERN_RANDOM, |
| 549 | .procname = "random", |
| 550 | .mode = 0555, |
| 551 | .child = random_table, |
| 552 | }, |
| 553 | { |
| 554 | .ctl_name = KERN_OVERFLOWUID, |
| 555 | .procname = "overflowuid", |
| 556 | .data = &overflowuid, |
| 557 | .maxlen = sizeof(int), |
| 558 | .mode = 0644, |
| 559 | .proc_handler = &proc_dointvec_minmax, |
| 560 | .strategy = &sysctl_intvec, |
| 561 | .extra1 = &minolduid, |
| 562 | .extra2 = &maxolduid, |
| 563 | }, |
| 564 | { |
| 565 | .ctl_name = KERN_OVERFLOWGID, |
| 566 | .procname = "overflowgid", |
| 567 | .data = &overflowgid, |
| 568 | .maxlen = sizeof(int), |
| 569 | .mode = 0644, |
| 570 | .proc_handler = &proc_dointvec_minmax, |
| 571 | .strategy = &sysctl_intvec, |
| 572 | .extra1 = &minolduid, |
| 573 | .extra2 = &maxolduid, |
| 574 | }, |
| 575 | #ifdef CONFIG_S390 |
| 576 | #ifdef CONFIG_MATHEMU |
| 577 | { |
| 578 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, |
| 579 | .procname = "ieee_emulation_warnings", |
| 580 | .data = &sysctl_ieee_emulation_warnings, |
| 581 | .maxlen = sizeof(int), |
| 582 | .mode = 0644, |
| 583 | .proc_handler = &proc_dointvec, |
| 584 | }, |
| 585 | #endif |
| 586 | { |
| 587 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, |
| 588 | .procname = "userprocess_debug", |
| 589 | .data = &sysctl_userprocess_debug, |
| 590 | .maxlen = sizeof(int), |
| 591 | .mode = 0644, |
| 592 | .proc_handler = &proc_dointvec, |
| 593 | }, |
| 594 | #endif |
| 595 | { |
| 596 | .ctl_name = KERN_PIDMAX, |
| 597 | .procname = "pid_max", |
| 598 | .data = &pid_max, |
| 599 | .maxlen = sizeof (int), |
| 600 | .mode = 0644, |
| 601 | .proc_handler = &proc_dointvec_minmax, |
| 602 | .strategy = sysctl_intvec, |
| 603 | .extra1 = &pid_max_min, |
| 604 | .extra2 = &pid_max_max, |
| 605 | }, |
| 606 | { |
| 607 | .ctl_name = KERN_PANIC_ON_OOPS, |
| 608 | .procname = "panic_on_oops", |
| 609 | .data = &panic_on_oops, |
| 610 | .maxlen = sizeof(int), |
| 611 | .mode = 0644, |
| 612 | .proc_handler = &proc_dointvec, |
| 613 | }, |
| 614 | #if defined CONFIG_PRINTK |
| 615 | { |
| 616 | .ctl_name = KERN_PRINTK, |
| 617 | .procname = "printk", |
| 618 | .data = &console_loglevel, |
| 619 | .maxlen = 4*sizeof(int), |
| 620 | .mode = 0644, |
| 621 | .proc_handler = &proc_dointvec, |
| 622 | }, |
| 623 | { |
| 624 | .ctl_name = KERN_PRINTK_RATELIMIT, |
| 625 | .procname = "printk_ratelimit", |
| 626 | .data = &printk_ratelimit_state.interval, |
| 627 | .maxlen = sizeof(int), |
| 628 | .mode = 0644, |
| 629 | .proc_handler = &proc_dointvec_jiffies, |
| 630 | .strategy = &sysctl_jiffies, |
| 631 | }, |
| 632 | { |
| 633 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, |
| 634 | .procname = "printk_ratelimit_burst", |
| 635 | .data = &printk_ratelimit_state.burst, |
| 636 | .maxlen = sizeof(int), |
| 637 | .mode = 0644, |
| 638 | .proc_handler = &proc_dointvec, |
| 639 | }, |
| 640 | #endif |
| 641 | { |
| 642 | .ctl_name = KERN_NGROUPS_MAX, |
| 643 | .procname = "ngroups_max", |
| 644 | .data = &ngroups_max, |
| 645 | .maxlen = sizeof (int), |
| 646 | .mode = 0444, |
| 647 | .proc_handler = &proc_dointvec, |
| 648 | }, |
| 649 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
| 650 | { |
| 651 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, |
| 652 | .procname = "unknown_nmi_panic", |
| 653 | .data = &unknown_nmi_panic, |
| 654 | .maxlen = sizeof (int), |
| 655 | .mode = 0644, |
| 656 | .proc_handler = &proc_dointvec, |
| 657 | }, |
| 658 | { |
| 659 | .procname = "nmi_watchdog", |
| 660 | .data = &nmi_watchdog_enabled, |
| 661 | .maxlen = sizeof (int), |
| 662 | .mode = 0644, |
| 663 | .proc_handler = &proc_nmi_enabled, |
| 664 | }, |
| 665 | #endif |
| 666 | #if defined(CONFIG_X86) |
| 667 | { |
| 668 | .ctl_name = KERN_PANIC_ON_NMI, |
| 669 | .procname = "panic_on_unrecovered_nmi", |
| 670 | .data = &panic_on_unrecovered_nmi, |
| 671 | .maxlen = sizeof(int), |
| 672 | .mode = 0644, |
| 673 | .proc_handler = &proc_dointvec, |
| 674 | }, |
| 675 | { |
| 676 | .ctl_name = KERN_BOOTLOADER_TYPE, |
| 677 | .procname = "bootloader_type", |
| 678 | .data = &bootloader_type, |
| 679 | .maxlen = sizeof (int), |
| 680 | .mode = 0444, |
| 681 | .proc_handler = &proc_dointvec, |
| 682 | }, |
| 683 | { |
| 684 | .ctl_name = CTL_UNNUMBERED, |
| 685 | .procname = "kstack_depth_to_print", |
| 686 | .data = &kstack_depth_to_print, |
| 687 | .maxlen = sizeof(int), |
| 688 | .mode = 0644, |
| 689 | .proc_handler = &proc_dointvec, |
| 690 | }, |
| 691 | { |
| 692 | .ctl_name = CTL_UNNUMBERED, |
| 693 | .procname = "io_delay_type", |
| 694 | .data = &io_delay_type, |
| 695 | .maxlen = sizeof(int), |
| 696 | .mode = 0644, |
| 697 | .proc_handler = &proc_dointvec, |
| 698 | }, |
| 699 | #endif |
| 700 | #if defined(CONFIG_MMU) |
| 701 | { |
| 702 | .ctl_name = KERN_RANDOMIZE, |
| 703 | .procname = "randomize_va_space", |
| 704 | .data = &randomize_va_space, |
| 705 | .maxlen = sizeof(int), |
| 706 | .mode = 0644, |
| 707 | .proc_handler = &proc_dointvec, |
| 708 | }, |
| 709 | #endif |
| 710 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
| 711 | { |
| 712 | .ctl_name = KERN_SPIN_RETRY, |
| 713 | .procname = "spin_retry", |
| 714 | .data = &spin_retry, |
| 715 | .maxlen = sizeof (int), |
| 716 | .mode = 0644, |
| 717 | .proc_handler = &proc_dointvec, |
| 718 | }, |
| 719 | #endif |
| 720 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
| 721 | { |
| 722 | .procname = "acpi_video_flags", |
| 723 | .data = &acpi_realmode_flags, |
| 724 | .maxlen = sizeof (unsigned long), |
| 725 | .mode = 0644, |
| 726 | .proc_handler = &proc_doulongvec_minmax, |
| 727 | }, |
| 728 | #endif |
| 729 | #ifdef CONFIG_IA64 |
| 730 | { |
| 731 | .ctl_name = KERN_IA64_UNALIGNED, |
| 732 | .procname = "ignore-unaligned-usertrap", |
| 733 | .data = &no_unaligned_warning, |
| 734 | .maxlen = sizeof (int), |
| 735 | .mode = 0644, |
| 736 | .proc_handler = &proc_dointvec, |
| 737 | }, |
| 738 | #endif |
| 739 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
| 740 | { |
| 741 | .ctl_name = CTL_UNNUMBERED, |
| 742 | .procname = "softlockup_panic", |
| 743 | .data = &softlockup_panic, |
| 744 | .maxlen = sizeof(int), |
| 745 | .mode = 0644, |
| 746 | .proc_handler = &proc_dointvec_minmax, |
| 747 | .strategy = &sysctl_intvec, |
| 748 | .extra1 = &zero, |
| 749 | .extra2 = &one, |
| 750 | }, |
| 751 | { |
| 752 | .ctl_name = CTL_UNNUMBERED, |
| 753 | .procname = "softlockup_thresh", |
| 754 | .data = &softlockup_thresh, |
| 755 | .maxlen = sizeof(int), |
| 756 | .mode = 0644, |
| 757 | .proc_handler = &proc_dointvec_minmax, |
| 758 | .strategy = &sysctl_intvec, |
| 759 | .extra1 = &neg_one, |
| 760 | .extra2 = &sixty, |
| 761 | }, |
| 762 | { |
| 763 | .ctl_name = CTL_UNNUMBERED, |
| 764 | .procname = "hung_task_check_count", |
| 765 | .data = &sysctl_hung_task_check_count, |
| 766 | .maxlen = sizeof(unsigned long), |
| 767 | .mode = 0644, |
| 768 | .proc_handler = &proc_doulongvec_minmax, |
| 769 | .strategy = &sysctl_intvec, |
| 770 | }, |
| 771 | { |
| 772 | .ctl_name = CTL_UNNUMBERED, |
| 773 | .procname = "hung_task_timeout_secs", |
| 774 | .data = &sysctl_hung_task_timeout_secs, |
| 775 | .maxlen = sizeof(unsigned long), |
| 776 | .mode = 0644, |
| 777 | .proc_handler = &proc_doulongvec_minmax, |
| 778 | .strategy = &sysctl_intvec, |
| 779 | }, |
| 780 | { |
| 781 | .ctl_name = CTL_UNNUMBERED, |
| 782 | .procname = "hung_task_warnings", |
| 783 | .data = &sysctl_hung_task_warnings, |
| 784 | .maxlen = sizeof(unsigned long), |
| 785 | .mode = 0644, |
| 786 | .proc_handler = &proc_doulongvec_minmax, |
| 787 | .strategy = &sysctl_intvec, |
| 788 | }, |
| 789 | #endif |
| 790 | #ifdef CONFIG_COMPAT |
| 791 | { |
| 792 | .ctl_name = KERN_COMPAT_LOG, |
| 793 | .procname = "compat-log", |
| 794 | .data = &compat_log, |
| 795 | .maxlen = sizeof (int), |
| 796 | .mode = 0644, |
| 797 | .proc_handler = &proc_dointvec, |
| 798 | }, |
| 799 | #endif |
| 800 | #ifdef CONFIG_RT_MUTEXES |
| 801 | { |
| 802 | .ctl_name = KERN_MAX_LOCK_DEPTH, |
| 803 | .procname = "max_lock_depth", |
| 804 | .data = &max_lock_depth, |
| 805 | .maxlen = sizeof(int), |
| 806 | .mode = 0644, |
| 807 | .proc_handler = &proc_dointvec, |
| 808 | }, |
| 809 | #endif |
| 810 | { |
| 811 | .ctl_name = CTL_UNNUMBERED, |
| 812 | .procname = "poweroff_cmd", |
| 813 | .data = &poweroff_cmd, |
| 814 | .maxlen = POWEROFF_CMD_PATH_LEN, |
| 815 | .mode = 0644, |
| 816 | .proc_handler = &proc_dostring, |
| 817 | .strategy = &sysctl_string, |
| 818 | }, |
| 819 | #ifdef CONFIG_KEYS |
| 820 | { |
| 821 | .ctl_name = CTL_UNNUMBERED, |
| 822 | .procname = "keys", |
| 823 | .mode = 0555, |
| 824 | .child = key_sysctls, |
| 825 | }, |
| 826 | #endif |
| 827 | #ifdef CONFIG_RCU_TORTURE_TEST |
| 828 | { |
| 829 | .ctl_name = CTL_UNNUMBERED, |
| 830 | .procname = "rcutorture_runnable", |
| 831 | .data = &rcutorture_runnable, |
| 832 | .maxlen = sizeof(int), |
| 833 | .mode = 0644, |
| 834 | .proc_handler = &proc_dointvec, |
| 835 | }, |
| 836 | #endif |
| 837 | /* |
| 838 | * NOTE: do not add new entries to this table unless you have read |
| 839 | * Documentation/sysctl/ctl_unnumbered.txt |
| 840 | */ |
| 841 | { .ctl_name = 0 } |
| 842 | }; |
| 843 | |
| 844 | static struct ctl_table vm_table[] = { |
| 845 | { |
| 846 | .ctl_name = VM_OVERCOMMIT_MEMORY, |
| 847 | .procname = "overcommit_memory", |
| 848 | .data = &sysctl_overcommit_memory, |
| 849 | .maxlen = sizeof(sysctl_overcommit_memory), |
| 850 | .mode = 0644, |
| 851 | .proc_handler = &proc_dointvec, |
| 852 | }, |
| 853 | { |
| 854 | .ctl_name = VM_PANIC_ON_OOM, |
| 855 | .procname = "panic_on_oom", |
| 856 | .data = &sysctl_panic_on_oom, |
| 857 | .maxlen = sizeof(sysctl_panic_on_oom), |
| 858 | .mode = 0644, |
| 859 | .proc_handler = &proc_dointvec, |
| 860 | }, |
| 861 | { |
| 862 | .ctl_name = CTL_UNNUMBERED, |
| 863 | .procname = "oom_kill_allocating_task", |
| 864 | .data = &sysctl_oom_kill_allocating_task, |
| 865 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), |
| 866 | .mode = 0644, |
| 867 | .proc_handler = &proc_dointvec, |
| 868 | }, |
| 869 | { |
| 870 | .ctl_name = CTL_UNNUMBERED, |
| 871 | .procname = "oom_dump_tasks", |
| 872 | .data = &sysctl_oom_dump_tasks, |
| 873 | .maxlen = sizeof(sysctl_oom_dump_tasks), |
| 874 | .mode = 0644, |
| 875 | .proc_handler = &proc_dointvec, |
| 876 | }, |
| 877 | { |
| 878 | .ctl_name = VM_OVERCOMMIT_RATIO, |
| 879 | .procname = "overcommit_ratio", |
| 880 | .data = &sysctl_overcommit_ratio, |
| 881 | .maxlen = sizeof(sysctl_overcommit_ratio), |
| 882 | .mode = 0644, |
| 883 | .proc_handler = &proc_dointvec, |
| 884 | }, |
| 885 | { |
| 886 | .ctl_name = VM_PAGE_CLUSTER, |
| 887 | .procname = "page-cluster", |
| 888 | .data = &page_cluster, |
| 889 | .maxlen = sizeof(int), |
| 890 | .mode = 0644, |
| 891 | .proc_handler = &proc_dointvec, |
| 892 | }, |
| 893 | { |
| 894 | .ctl_name = VM_DIRTY_BACKGROUND, |
| 895 | .procname = "dirty_background_ratio", |
| 896 | .data = &dirty_background_ratio, |
| 897 | .maxlen = sizeof(dirty_background_ratio), |
| 898 | .mode = 0644, |
| 899 | .proc_handler = &proc_dointvec_minmax, |
| 900 | .strategy = &sysctl_intvec, |
| 901 | .extra1 = &zero, |
| 902 | .extra2 = &one_hundred, |
| 903 | }, |
| 904 | { |
| 905 | .ctl_name = VM_DIRTY_RATIO, |
| 906 | .procname = "dirty_ratio", |
| 907 | .data = &vm_dirty_ratio, |
| 908 | .maxlen = sizeof(vm_dirty_ratio), |
| 909 | .mode = 0644, |
| 910 | .proc_handler = &dirty_ratio_handler, |
| 911 | .strategy = &sysctl_intvec, |
| 912 | .extra1 = &zero, |
| 913 | .extra2 = &one_hundred, |
| 914 | }, |
| 915 | { |
| 916 | .procname = "dirty_writeback_centisecs", |
| 917 | .data = &dirty_writeback_interval, |
| 918 | .maxlen = sizeof(dirty_writeback_interval), |
| 919 | .mode = 0644, |
| 920 | .proc_handler = &dirty_writeback_centisecs_handler, |
| 921 | }, |
| 922 | { |
| 923 | .procname = "dirty_expire_centisecs", |
| 924 | .data = &dirty_expire_interval, |
| 925 | .maxlen = sizeof(dirty_expire_interval), |
| 926 | .mode = 0644, |
| 927 | .proc_handler = &proc_dointvec_userhz_jiffies, |
| 928 | }, |
| 929 | { |
| 930 | .ctl_name = VM_NR_PDFLUSH_THREADS, |
| 931 | .procname = "nr_pdflush_threads", |
| 932 | .data = &nr_pdflush_threads, |
| 933 | .maxlen = sizeof nr_pdflush_threads, |
| 934 | .mode = 0444 /* read-only*/, |
| 935 | .proc_handler = &proc_dointvec, |
| 936 | }, |
| 937 | { |
| 938 | .ctl_name = VM_SWAPPINESS, |
| 939 | .procname = "swappiness", |
| 940 | .data = &vm_swappiness, |
| 941 | .maxlen = sizeof(vm_swappiness), |
| 942 | .mode = 0644, |
| 943 | .proc_handler = &proc_dointvec_minmax, |
| 944 | .strategy = &sysctl_intvec, |
| 945 | .extra1 = &zero, |
| 946 | .extra2 = &one_hundred, |
| 947 | }, |
| 948 | #ifdef CONFIG_HUGETLB_PAGE |
| 949 | { |
| 950 | .procname = "nr_hugepages", |
| 951 | .data = NULL, |
| 952 | .maxlen = sizeof(unsigned long), |
| 953 | .mode = 0644, |
| 954 | .proc_handler = &hugetlb_sysctl_handler, |
| 955 | .extra1 = (void *)&hugetlb_zero, |
| 956 | .extra2 = (void *)&hugetlb_infinity, |
| 957 | }, |
| 958 | { |
| 959 | .ctl_name = VM_HUGETLB_GROUP, |
| 960 | .procname = "hugetlb_shm_group", |
| 961 | .data = &sysctl_hugetlb_shm_group, |
| 962 | .maxlen = sizeof(gid_t), |
| 963 | .mode = 0644, |
| 964 | .proc_handler = &proc_dointvec, |
| 965 | }, |
| 966 | { |
| 967 | .ctl_name = CTL_UNNUMBERED, |
| 968 | .procname = "hugepages_treat_as_movable", |
| 969 | .data = &hugepages_treat_as_movable, |
| 970 | .maxlen = sizeof(int), |
| 971 | .mode = 0644, |
| 972 | .proc_handler = &hugetlb_treat_movable_handler, |
| 973 | }, |
| 974 | { |
| 975 | .ctl_name = CTL_UNNUMBERED, |
| 976 | .procname = "nr_overcommit_hugepages", |
| 977 | .data = NULL, |
| 978 | .maxlen = sizeof(unsigned long), |
| 979 | .mode = 0644, |
| 980 | .proc_handler = &hugetlb_overcommit_handler, |
| 981 | .extra1 = (void *)&hugetlb_zero, |
| 982 | .extra2 = (void *)&hugetlb_infinity, |
| 983 | }, |
| 984 | #endif |
| 985 | { |
| 986 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, |
| 987 | .procname = "lowmem_reserve_ratio", |
| 988 | .data = &sysctl_lowmem_reserve_ratio, |
| 989 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), |
| 990 | .mode = 0644, |
| 991 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, |
| 992 | .strategy = &sysctl_intvec, |
| 993 | }, |
| 994 | { |
| 995 | .ctl_name = VM_DROP_PAGECACHE, |
| 996 | .procname = "drop_caches", |
| 997 | .data = &sysctl_drop_caches, |
| 998 | .maxlen = sizeof(int), |
| 999 | .mode = 0644, |
| 1000 | .proc_handler = drop_caches_sysctl_handler, |
| 1001 | .strategy = &sysctl_intvec, |
| 1002 | }, |
| 1003 | { |
| 1004 | .ctl_name = VM_MIN_FREE_KBYTES, |
| 1005 | .procname = "min_free_kbytes", |
| 1006 | .data = &min_free_kbytes, |
| 1007 | .maxlen = sizeof(min_free_kbytes), |
| 1008 | .mode = 0644, |
| 1009 | .proc_handler = &min_free_kbytes_sysctl_handler, |
| 1010 | .strategy = &sysctl_intvec, |
| 1011 | .extra1 = &zero, |
| 1012 | }, |
| 1013 | { |
| 1014 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, |
| 1015 | .procname = "percpu_pagelist_fraction", |
| 1016 | .data = &percpu_pagelist_fraction, |
| 1017 | .maxlen = sizeof(percpu_pagelist_fraction), |
| 1018 | .mode = 0644, |
| 1019 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, |
| 1020 | .strategy = &sysctl_intvec, |
| 1021 | .extra1 = &min_percpu_pagelist_fract, |
| 1022 | }, |
| 1023 | #ifdef CONFIG_MMU |
| 1024 | { |
| 1025 | .ctl_name = VM_MAX_MAP_COUNT, |
| 1026 | .procname = "max_map_count", |
| 1027 | .data = &sysctl_max_map_count, |
| 1028 | .maxlen = sizeof(sysctl_max_map_count), |
| 1029 | .mode = 0644, |
| 1030 | .proc_handler = &proc_dointvec |
| 1031 | }, |
| 1032 | #endif |
| 1033 | { |
| 1034 | .ctl_name = VM_LAPTOP_MODE, |
| 1035 | .procname = "laptop_mode", |
| 1036 | .data = &laptop_mode, |
| 1037 | .maxlen = sizeof(laptop_mode), |
| 1038 | .mode = 0644, |
| 1039 | .proc_handler = &proc_dointvec_jiffies, |
| 1040 | .strategy = &sysctl_jiffies, |
| 1041 | }, |
| 1042 | { |
| 1043 | .ctl_name = VM_BLOCK_DUMP, |
| 1044 | .procname = "block_dump", |
| 1045 | .data = &block_dump, |
| 1046 | .maxlen = sizeof(block_dump), |
| 1047 | .mode = 0644, |
| 1048 | .proc_handler = &proc_dointvec, |
| 1049 | .strategy = &sysctl_intvec, |
| 1050 | .extra1 = &zero, |
| 1051 | }, |
| 1052 | { |
| 1053 | .ctl_name = VM_VFS_CACHE_PRESSURE, |
| 1054 | .procname = "vfs_cache_pressure", |
| 1055 | .data = &sysctl_vfs_cache_pressure, |
| 1056 | .maxlen = sizeof(sysctl_vfs_cache_pressure), |
| 1057 | .mode = 0644, |
| 1058 | .proc_handler = &proc_dointvec, |
| 1059 | .strategy = &sysctl_intvec, |
| 1060 | .extra1 = &zero, |
| 1061 | }, |
| 1062 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
| 1063 | { |
| 1064 | .ctl_name = VM_LEGACY_VA_LAYOUT, |
| 1065 | .procname = "legacy_va_layout", |
| 1066 | .data = &sysctl_legacy_va_layout, |
| 1067 | .maxlen = sizeof(sysctl_legacy_va_layout), |
| 1068 | .mode = 0644, |
| 1069 | .proc_handler = &proc_dointvec, |
| 1070 | .strategy = &sysctl_intvec, |
| 1071 | .extra1 = &zero, |
| 1072 | }, |
| 1073 | #endif |
| 1074 | #ifdef CONFIG_NUMA |
| 1075 | { |
| 1076 | .ctl_name = VM_ZONE_RECLAIM_MODE, |
| 1077 | .procname = "zone_reclaim_mode", |
| 1078 | .data = &zone_reclaim_mode, |
| 1079 | .maxlen = sizeof(zone_reclaim_mode), |
| 1080 | .mode = 0644, |
| 1081 | .proc_handler = &proc_dointvec, |
| 1082 | .strategy = &sysctl_intvec, |
| 1083 | .extra1 = &zero, |
| 1084 | }, |
| 1085 | { |
| 1086 | .ctl_name = VM_MIN_UNMAPPED, |
| 1087 | .procname = "min_unmapped_ratio", |
| 1088 | .data = &sysctl_min_unmapped_ratio, |
| 1089 | .maxlen = sizeof(sysctl_min_unmapped_ratio), |
| 1090 | .mode = 0644, |
| 1091 | .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, |
| 1092 | .strategy = &sysctl_intvec, |
| 1093 | .extra1 = &zero, |
| 1094 | .extra2 = &one_hundred, |
| 1095 | }, |
| 1096 | { |
| 1097 | .ctl_name = VM_MIN_SLAB, |
| 1098 | .procname = "min_slab_ratio", |
| 1099 | .data = &sysctl_min_slab_ratio, |
| 1100 | .maxlen = sizeof(sysctl_min_slab_ratio), |
| 1101 | .mode = 0644, |
| 1102 | .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, |
| 1103 | .strategy = &sysctl_intvec, |
| 1104 | .extra1 = &zero, |
| 1105 | .extra2 = &one_hundred, |
| 1106 | }, |
| 1107 | #endif |
| 1108 | #ifdef CONFIG_SMP |
| 1109 | { |
| 1110 | .ctl_name = CTL_UNNUMBERED, |
| 1111 | .procname = "stat_interval", |
| 1112 | .data = &sysctl_stat_interval, |
| 1113 | .maxlen = sizeof(sysctl_stat_interval), |
| 1114 | .mode = 0644, |
| 1115 | .proc_handler = &proc_dointvec_jiffies, |
| 1116 | .strategy = &sysctl_jiffies, |
| 1117 | }, |
| 1118 | #endif |
| 1119 | #ifdef CONFIG_SECURITY |
| 1120 | { |
| 1121 | .ctl_name = CTL_UNNUMBERED, |
| 1122 | .procname = "mmap_min_addr", |
| 1123 | .data = &mmap_min_addr, |
| 1124 | .maxlen = sizeof(unsigned long), |
| 1125 | .mode = 0644, |
| 1126 | .proc_handler = &proc_doulongvec_minmax, |
| 1127 | }, |
| 1128 | #endif |
| 1129 | #ifdef CONFIG_NUMA |
| 1130 | { |
| 1131 | .ctl_name = CTL_UNNUMBERED, |
| 1132 | .procname = "numa_zonelist_order", |
| 1133 | .data = &numa_zonelist_order, |
| 1134 | .maxlen = NUMA_ZONELIST_ORDER_LEN, |
| 1135 | .mode = 0644, |
| 1136 | .proc_handler = &numa_zonelist_order_handler, |
| 1137 | .strategy = &sysctl_string, |
| 1138 | }, |
| 1139 | #endif |
| 1140 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
| 1141 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
| 1142 | { |
| 1143 | .ctl_name = VM_VDSO_ENABLED, |
| 1144 | .procname = "vdso_enabled", |
| 1145 | .data = &vdso_enabled, |
| 1146 | .maxlen = sizeof(vdso_enabled), |
| 1147 | .mode = 0644, |
| 1148 | .proc_handler = &proc_dointvec, |
| 1149 | .strategy = &sysctl_intvec, |
| 1150 | .extra1 = &zero, |
| 1151 | }, |
| 1152 | #endif |
| 1153 | #ifdef CONFIG_HIGHMEM |
| 1154 | { |
| 1155 | .ctl_name = CTL_UNNUMBERED, |
| 1156 | .procname = "highmem_is_dirtyable", |
| 1157 | .data = &vm_highmem_is_dirtyable, |
| 1158 | .maxlen = sizeof(vm_highmem_is_dirtyable), |
| 1159 | .mode = 0644, |
| 1160 | .proc_handler = &proc_dointvec_minmax, |
| 1161 | .strategy = &sysctl_intvec, |
| 1162 | .extra1 = &zero, |
| 1163 | .extra2 = &one, |
| 1164 | }, |
| 1165 | #endif |
| 1166 | /* |
| 1167 | * NOTE: do not add new entries to this table unless you have read |
| 1168 | * Documentation/sysctl/ctl_unnumbered.txt |
| 1169 | */ |
| 1170 | { .ctl_name = 0 } |
| 1171 | }; |
| 1172 | |
| 1173 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
| 1174 | static struct ctl_table binfmt_misc_table[] = { |
| 1175 | { .ctl_name = 0 } |
| 1176 | }; |
| 1177 | #endif |
| 1178 | |
| 1179 | static struct ctl_table fs_table[] = { |
| 1180 | { |
| 1181 | .ctl_name = FS_NRINODE, |
| 1182 | .procname = "inode-nr", |
| 1183 | .data = &inodes_stat, |
| 1184 | .maxlen = 2*sizeof(int), |
| 1185 | .mode = 0444, |
| 1186 | .proc_handler = &proc_dointvec, |
| 1187 | }, |
| 1188 | { |
| 1189 | .ctl_name = FS_STATINODE, |
| 1190 | .procname = "inode-state", |
| 1191 | .data = &inodes_stat, |
| 1192 | .maxlen = 7*sizeof(int), |
| 1193 | .mode = 0444, |
| 1194 | .proc_handler = &proc_dointvec, |
| 1195 | }, |
| 1196 | { |
| 1197 | .procname = "file-nr", |
| 1198 | .data = &files_stat, |
| 1199 | .maxlen = 3*sizeof(int), |
| 1200 | .mode = 0444, |
| 1201 | .proc_handler = &proc_nr_files, |
| 1202 | }, |
| 1203 | { |
| 1204 | .ctl_name = FS_MAXFILE, |
| 1205 | .procname = "file-max", |
| 1206 | .data = &files_stat.max_files, |
| 1207 | .maxlen = sizeof(int), |
| 1208 | .mode = 0644, |
| 1209 | .proc_handler = &proc_dointvec, |
| 1210 | }, |
| 1211 | { |
| 1212 | .ctl_name = CTL_UNNUMBERED, |
| 1213 | .procname = "nr_open", |
| 1214 | .data = &sysctl_nr_open, |
| 1215 | .maxlen = sizeof(int), |
| 1216 | .mode = 0644, |
| 1217 | .proc_handler = &proc_dointvec_minmax, |
| 1218 | .extra1 = &sysctl_nr_open_min, |
| 1219 | .extra2 = &sysctl_nr_open_max, |
| 1220 | }, |
| 1221 | { |
| 1222 | .ctl_name = FS_DENTRY, |
| 1223 | .procname = "dentry-state", |
| 1224 | .data = &dentry_stat, |
| 1225 | .maxlen = 6*sizeof(int), |
| 1226 | .mode = 0444, |
| 1227 | .proc_handler = &proc_dointvec, |
| 1228 | }, |
| 1229 | { |
| 1230 | .ctl_name = FS_OVERFLOWUID, |
| 1231 | .procname = "overflowuid", |
| 1232 | .data = &fs_overflowuid, |
| 1233 | .maxlen = sizeof(int), |
| 1234 | .mode = 0644, |
| 1235 | .proc_handler = &proc_dointvec_minmax, |
| 1236 | .strategy = &sysctl_intvec, |
| 1237 | .extra1 = &minolduid, |
| 1238 | .extra2 = &maxolduid, |
| 1239 | }, |
| 1240 | { |
| 1241 | .ctl_name = FS_OVERFLOWGID, |
| 1242 | .procname = "overflowgid", |
| 1243 | .data = &fs_overflowgid, |
| 1244 | .maxlen = sizeof(int), |
| 1245 | .mode = 0644, |
| 1246 | .proc_handler = &proc_dointvec_minmax, |
| 1247 | .strategy = &sysctl_intvec, |
| 1248 | .extra1 = &minolduid, |
| 1249 | .extra2 = &maxolduid, |
| 1250 | }, |
| 1251 | #ifdef CONFIG_FILE_LOCKING |
| 1252 | { |
| 1253 | .ctl_name = FS_LEASES, |
| 1254 | .procname = "leases-enable", |
| 1255 | .data = &leases_enable, |
| 1256 | .maxlen = sizeof(int), |
| 1257 | .mode = 0644, |
| 1258 | .proc_handler = &proc_dointvec, |
| 1259 | }, |
| 1260 | #endif |
| 1261 | #ifdef CONFIG_DNOTIFY |
| 1262 | { |
| 1263 | .ctl_name = FS_DIR_NOTIFY, |
| 1264 | .procname = "dir-notify-enable", |
| 1265 | .data = &dir_notify_enable, |
| 1266 | .maxlen = sizeof(int), |
| 1267 | .mode = 0644, |
| 1268 | .proc_handler = &proc_dointvec, |
| 1269 | }, |
| 1270 | #endif |
| 1271 | #ifdef CONFIG_MMU |
| 1272 | #ifdef CONFIG_FILE_LOCKING |
| 1273 | { |
| 1274 | .ctl_name = FS_LEASE_TIME, |
| 1275 | .procname = "lease-break-time", |
| 1276 | .data = &lease_break_time, |
| 1277 | .maxlen = sizeof(int), |
| 1278 | .mode = 0644, |
| 1279 | .proc_handler = &proc_dointvec_minmax, |
| 1280 | .strategy = &sysctl_intvec, |
| 1281 | .extra1 = &zero, |
| 1282 | .extra2 = &two, |
| 1283 | }, |
| 1284 | #endif |
| 1285 | { |
| 1286 | .procname = "aio-nr", |
| 1287 | .data = &aio_nr, |
| 1288 | .maxlen = sizeof(aio_nr), |
| 1289 | .mode = 0444, |
| 1290 | .proc_handler = &proc_doulongvec_minmax, |
| 1291 | }, |
| 1292 | { |
| 1293 | .procname = "aio-max-nr", |
| 1294 | .data = &aio_max_nr, |
| 1295 | .maxlen = sizeof(aio_max_nr), |
| 1296 | .mode = 0644, |
| 1297 | .proc_handler = &proc_doulongvec_minmax, |
| 1298 | }, |
| 1299 | #ifdef CONFIG_INOTIFY_USER |
| 1300 | { |
| 1301 | .ctl_name = FS_INOTIFY, |
| 1302 | .procname = "inotify", |
| 1303 | .mode = 0555, |
| 1304 | .child = inotify_table, |
| 1305 | }, |
| 1306 | #endif |
| 1307 | #endif |
| 1308 | { |
| 1309 | .ctl_name = KERN_SETUID_DUMPABLE, |
| 1310 | .procname = "suid_dumpable", |
| 1311 | .data = &suid_dumpable, |
| 1312 | .maxlen = sizeof(int), |
| 1313 | .mode = 0644, |
| 1314 | .proc_handler = &proc_dointvec, |
| 1315 | }, |
| 1316 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
| 1317 | { |
| 1318 | .ctl_name = CTL_UNNUMBERED, |
| 1319 | .procname = "binfmt_misc", |
| 1320 | .mode = 0555, |
| 1321 | .child = binfmt_misc_table, |
| 1322 | }, |
| 1323 | #endif |
| 1324 | /* |
| 1325 | * NOTE: do not add new entries to this table unless you have read |
| 1326 | * Documentation/sysctl/ctl_unnumbered.txt |
| 1327 | */ |
| 1328 | { .ctl_name = 0 } |
| 1329 | }; |
| 1330 | |
| 1331 | static struct ctl_table debug_table[] = { |
| 1332 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) |
| 1333 | { |
| 1334 | .ctl_name = CTL_UNNUMBERED, |
| 1335 | .procname = "exception-trace", |
| 1336 | .data = &show_unhandled_signals, |
| 1337 | .maxlen = sizeof(int), |
| 1338 | .mode = 0644, |
| 1339 | .proc_handler = proc_dointvec |
| 1340 | }, |
| 1341 | #endif |
| 1342 | { .ctl_name = 0 } |
| 1343 | }; |
| 1344 | |
| 1345 | static struct ctl_table dev_table[] = { |
| 1346 | { .ctl_name = 0 } |
| 1347 | }; |
| 1348 | |
| 1349 | static DEFINE_SPINLOCK(sysctl_lock); |
| 1350 | |
| 1351 | /* called under sysctl_lock */ |
| 1352 | static int use_table(struct ctl_table_header *p) |
| 1353 | { |
| 1354 | if (unlikely(p->unregistering)) |
| 1355 | return 0; |
| 1356 | p->used++; |
| 1357 | return 1; |
| 1358 | } |
| 1359 | |
| 1360 | /* called under sysctl_lock */ |
| 1361 | static void unuse_table(struct ctl_table_header *p) |
| 1362 | { |
| 1363 | if (!--p->used) |
| 1364 | if (unlikely(p->unregistering)) |
| 1365 | complete(p->unregistering); |
| 1366 | } |
| 1367 | |
| 1368 | /* called under sysctl_lock, will reacquire if has to wait */ |
| 1369 | static void start_unregistering(struct ctl_table_header *p) |
| 1370 | { |
| 1371 | /* |
| 1372 | * if p->used is 0, nobody will ever touch that entry again; |
| 1373 | * we'll eliminate all paths to it before dropping sysctl_lock |
| 1374 | */ |
| 1375 | if (unlikely(p->used)) { |
| 1376 | struct completion wait; |
| 1377 | init_completion(&wait); |
| 1378 | p->unregistering = &wait; |
| 1379 | spin_unlock(&sysctl_lock); |
| 1380 | wait_for_completion(&wait); |
| 1381 | spin_lock(&sysctl_lock); |
| 1382 | } else { |
| 1383 | /* anything non-NULL; we'll never dereference it */ |
| 1384 | p->unregistering = ERR_PTR(-EINVAL); |
| 1385 | } |
| 1386 | /* |
| 1387 | * do not remove from the list until nobody holds it; walking the |
| 1388 | * list in do_sysctl() relies on that. |
| 1389 | */ |
| 1390 | list_del_init(&p->ctl_entry); |
| 1391 | } |
| 1392 | |
| 1393 | void sysctl_head_get(struct ctl_table_header *head) |
| 1394 | { |
| 1395 | spin_lock(&sysctl_lock); |
| 1396 | head->count++; |
| 1397 | spin_unlock(&sysctl_lock); |
| 1398 | } |
| 1399 | |
| 1400 | void sysctl_head_put(struct ctl_table_header *head) |
| 1401 | { |
| 1402 | spin_lock(&sysctl_lock); |
| 1403 | if (!--head->count) |
| 1404 | kfree(head); |
| 1405 | spin_unlock(&sysctl_lock); |
| 1406 | } |
| 1407 | |
| 1408 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) |
| 1409 | { |
| 1410 | if (!head) |
| 1411 | BUG(); |
| 1412 | spin_lock(&sysctl_lock); |
| 1413 | if (!use_table(head)) |
| 1414 | head = ERR_PTR(-ENOENT); |
| 1415 | spin_unlock(&sysctl_lock); |
| 1416 | return head; |
| 1417 | } |
| 1418 | |
| 1419 | void sysctl_head_finish(struct ctl_table_header *head) |
| 1420 | { |
| 1421 | if (!head) |
| 1422 | return; |
| 1423 | spin_lock(&sysctl_lock); |
| 1424 | unuse_table(head); |
| 1425 | spin_unlock(&sysctl_lock); |
| 1426 | } |
| 1427 | |
| 1428 | static struct ctl_table_set * |
| 1429 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) |
| 1430 | { |
| 1431 | struct ctl_table_set *set = &root->default_set; |
| 1432 | if (root->lookup) |
| 1433 | set = root->lookup(root, namespaces); |
| 1434 | return set; |
| 1435 | } |
| 1436 | |
| 1437 | static struct list_head * |
| 1438 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) |
| 1439 | { |
| 1440 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
| 1441 | return &set->list; |
| 1442 | } |
| 1443 | |
| 1444 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, |
| 1445 | struct ctl_table_header *prev) |
| 1446 | { |
| 1447 | struct ctl_table_root *root; |
| 1448 | struct list_head *header_list; |
| 1449 | struct ctl_table_header *head; |
| 1450 | struct list_head *tmp; |
| 1451 | |
| 1452 | spin_lock(&sysctl_lock); |
| 1453 | if (prev) { |
| 1454 | head = prev; |
| 1455 | tmp = &prev->ctl_entry; |
| 1456 | unuse_table(prev); |
| 1457 | goto next; |
| 1458 | } |
| 1459 | tmp = &root_table_header.ctl_entry; |
| 1460 | for (;;) { |
| 1461 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); |
| 1462 | |
| 1463 | if (!use_table(head)) |
| 1464 | goto next; |
| 1465 | spin_unlock(&sysctl_lock); |
| 1466 | return head; |
| 1467 | next: |
| 1468 | root = head->root; |
| 1469 | tmp = tmp->next; |
| 1470 | header_list = lookup_header_list(root, namespaces); |
| 1471 | if (tmp != header_list) |
| 1472 | continue; |
| 1473 | |
| 1474 | do { |
| 1475 | root = list_entry(root->root_list.next, |
| 1476 | struct ctl_table_root, root_list); |
| 1477 | if (root == &sysctl_table_root) |
| 1478 | goto out; |
| 1479 | header_list = lookup_header_list(root, namespaces); |
| 1480 | } while (list_empty(header_list)); |
| 1481 | tmp = header_list->next; |
| 1482 | } |
| 1483 | out: |
| 1484 | spin_unlock(&sysctl_lock); |
| 1485 | return NULL; |
| 1486 | } |
| 1487 | |
| 1488 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
| 1489 | { |
| 1490 | return __sysctl_head_next(current->nsproxy, prev); |
| 1491 | } |
| 1492 | |
| 1493 | void register_sysctl_root(struct ctl_table_root *root) |
| 1494 | { |
| 1495 | spin_lock(&sysctl_lock); |
| 1496 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); |
| 1497 | spin_unlock(&sysctl_lock); |
| 1498 | } |
| 1499 | |
| 1500 | #ifdef CONFIG_SYSCTL_SYSCALL |
| 1501 | /* Perform the actual read/write of a sysctl table entry. */ |
| 1502 | static int do_sysctl_strategy(struct ctl_table_root *root, |
| 1503 | struct ctl_table *table, |
| 1504 | int __user *name, int nlen, |
| 1505 | void __user *oldval, size_t __user *oldlenp, |
| 1506 | void __user *newval, size_t newlen) |
| 1507 | { |
| 1508 | int op = 0, rc; |
| 1509 | |
| 1510 | if (oldval) |
| 1511 | op |= MAY_READ; |
| 1512 | if (newval) |
| 1513 | op |= MAY_WRITE; |
| 1514 | if (sysctl_perm(root, table, op)) |
| 1515 | return -EPERM; |
| 1516 | |
| 1517 | if (table->strategy) { |
| 1518 | rc = table->strategy(table, name, nlen, oldval, oldlenp, |
| 1519 | newval, newlen); |
| 1520 | if (rc < 0) |
| 1521 | return rc; |
| 1522 | if (rc > 0) |
| 1523 | return 0; |
| 1524 | } |
| 1525 | |
| 1526 | /* If there is no strategy routine, or if the strategy returns |
| 1527 | * zero, proceed with automatic r/w */ |
| 1528 | if (table->data && table->maxlen) { |
| 1529 | rc = sysctl_data(table, name, nlen, oldval, oldlenp, |
| 1530 | newval, newlen); |
| 1531 | if (rc < 0) |
| 1532 | return rc; |
| 1533 | } |
| 1534 | return 0; |
| 1535 | } |
| 1536 | |
| 1537 | static int parse_table(int __user *name, int nlen, |
| 1538 | void __user *oldval, size_t __user *oldlenp, |
| 1539 | void __user *newval, size_t newlen, |
| 1540 | struct ctl_table_root *root, |
| 1541 | struct ctl_table *table) |
| 1542 | { |
| 1543 | int n; |
| 1544 | repeat: |
| 1545 | if (!nlen) |
| 1546 | return -ENOTDIR; |
| 1547 | if (get_user(n, name)) |
| 1548 | return -EFAULT; |
| 1549 | for ( ; table->ctl_name || table->procname; table++) { |
| 1550 | if (!table->ctl_name) |
| 1551 | continue; |
| 1552 | if (n == table->ctl_name) { |
| 1553 | int error; |
| 1554 | if (table->child) { |
| 1555 | if (sysctl_perm(root, table, MAY_EXEC)) |
| 1556 | return -EPERM; |
| 1557 | name++; |
| 1558 | nlen--; |
| 1559 | table = table->child; |
| 1560 | goto repeat; |
| 1561 | } |
| 1562 | error = do_sysctl_strategy(root, table, name, nlen, |
| 1563 | oldval, oldlenp, |
| 1564 | newval, newlen); |
| 1565 | return error; |
| 1566 | } |
| 1567 | } |
| 1568 | return -ENOTDIR; |
| 1569 | } |
| 1570 | |
| 1571 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, |
| 1572 | void __user *newval, size_t newlen) |
| 1573 | { |
| 1574 | struct ctl_table_header *head; |
| 1575 | int error = -ENOTDIR; |
| 1576 | |
| 1577 | if (nlen <= 0 || nlen >= CTL_MAXNAME) |
| 1578 | return -ENOTDIR; |
| 1579 | if (oldval) { |
| 1580 | int old_len; |
| 1581 | if (!oldlenp || get_user(old_len, oldlenp)) |
| 1582 | return -EFAULT; |
| 1583 | } |
| 1584 | |
| 1585 | for (head = sysctl_head_next(NULL); head; |
| 1586 | head = sysctl_head_next(head)) { |
| 1587 | error = parse_table(name, nlen, oldval, oldlenp, |
| 1588 | newval, newlen, |
| 1589 | head->root, head->ctl_table); |
| 1590 | if (error != -ENOTDIR) { |
| 1591 | sysctl_head_finish(head); |
| 1592 | break; |
| 1593 | } |
| 1594 | } |
| 1595 | return error; |
| 1596 | } |
| 1597 | |
| 1598 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) |
| 1599 | { |
| 1600 | struct __sysctl_args tmp; |
| 1601 | int error; |
| 1602 | |
| 1603 | if (copy_from_user(&tmp, args, sizeof(tmp))) |
| 1604 | return -EFAULT; |
| 1605 | |
| 1606 | error = deprecated_sysctl_warning(&tmp); |
| 1607 | if (error) |
| 1608 | goto out; |
| 1609 | |
| 1610 | lock_kernel(); |
| 1611 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, |
| 1612 | tmp.newval, tmp.newlen); |
| 1613 | unlock_kernel(); |
| 1614 | out: |
| 1615 | return error; |
| 1616 | } |
| 1617 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
| 1618 | |
| 1619 | /* |
| 1620 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
| 1621 | * some sysctl variables are readonly even to root. |
| 1622 | */ |
| 1623 | |
| 1624 | static int test_perm(int mode, int op) |
| 1625 | { |
| 1626 | if (!current->euid) |
| 1627 | mode >>= 6; |
| 1628 | else if (in_egroup_p(0)) |
| 1629 | mode >>= 3; |
| 1630 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
| 1631 | return 0; |
| 1632 | return -EACCES; |
| 1633 | } |
| 1634 | |
| 1635 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
| 1636 | { |
| 1637 | int error; |
| 1638 | int mode; |
| 1639 | |
| 1640 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
| 1641 | if (error) |
| 1642 | return error; |
| 1643 | |
| 1644 | if (root->permissions) |
| 1645 | mode = root->permissions(root, current->nsproxy, table); |
| 1646 | else |
| 1647 | mode = table->mode; |
| 1648 | |
| 1649 | return test_perm(mode, op); |
| 1650 | } |
| 1651 | |
| 1652 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
| 1653 | { |
| 1654 | for (; table->ctl_name || table->procname; table++) { |
| 1655 | table->parent = parent; |
| 1656 | if (table->child) |
| 1657 | sysctl_set_parent(table, table->child); |
| 1658 | } |
| 1659 | } |
| 1660 | |
| 1661 | static __init int sysctl_init(void) |
| 1662 | { |
| 1663 | sysctl_set_parent(NULL, root_table); |
| 1664 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
| 1665 | { |
| 1666 | int err; |
| 1667 | err = sysctl_check_table(current->nsproxy, root_table); |
| 1668 | } |
| 1669 | #endif |
| 1670 | return 0; |
| 1671 | } |
| 1672 | |
| 1673 | core_initcall(sysctl_init); |
| 1674 | |
| 1675 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
| 1676 | struct ctl_table *table) |
| 1677 | { |
| 1678 | struct ctl_table *p; |
| 1679 | const char *s = branch->procname; |
| 1680 | |
| 1681 | /* branch should have named subdirectory as its first element */ |
| 1682 | if (!s || !branch->child) |
| 1683 | return NULL; |
| 1684 | |
| 1685 | /* ... and nothing else */ |
| 1686 | if (branch[1].procname || branch[1].ctl_name) |
| 1687 | return NULL; |
| 1688 | |
| 1689 | /* table should contain subdirectory with the same name */ |
| 1690 | for (p = table; p->procname || p->ctl_name; p++) { |
| 1691 | if (!p->child) |
| 1692 | continue; |
| 1693 | if (p->procname && strcmp(p->procname, s) == 0) |
| 1694 | return p; |
| 1695 | } |
| 1696 | return NULL; |
| 1697 | } |
| 1698 | |
| 1699 | /* see if attaching q to p would be an improvement */ |
| 1700 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) |
| 1701 | { |
| 1702 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; |
| 1703 | struct ctl_table *next; |
| 1704 | int is_better = 0; |
| 1705 | int not_in_parent = !p->attached_by; |
| 1706 | |
| 1707 | while ((next = is_branch_in(by, to)) != NULL) { |
| 1708 | if (by == q->attached_by) |
| 1709 | is_better = 1; |
| 1710 | if (to == p->attached_by) |
| 1711 | not_in_parent = 1; |
| 1712 | by = by->child; |
| 1713 | to = next->child; |
| 1714 | } |
| 1715 | |
| 1716 | if (is_better && not_in_parent) { |
| 1717 | q->attached_by = by; |
| 1718 | q->attached_to = to; |
| 1719 | q->parent = p; |
| 1720 | } |
| 1721 | } |
| 1722 | |
| 1723 | /** |
| 1724 | * __register_sysctl_paths - register a sysctl hierarchy |
| 1725 | * @root: List of sysctl headers to register on |
| 1726 | * @namespaces: Data to compute which lists of sysctl entries are visible |
| 1727 | * @path: The path to the directory the sysctl table is in. |
| 1728 | * @table: the top-level table structure |
| 1729 | * |
| 1730 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
| 1731 | * array. A completely 0 filled entry terminates the table. |
| 1732 | * |
| 1733 | * The members of the &struct ctl_table structure are used as follows: |
| 1734 | * |
| 1735 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number |
| 1736 | * must be unique within that level of sysctl |
| 1737 | * |
| 1738 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
| 1739 | * enter a sysctl file |
| 1740 | * |
| 1741 | * data - a pointer to data for use by proc_handler |
| 1742 | * |
| 1743 | * maxlen - the maximum size in bytes of the data |
| 1744 | * |
| 1745 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) |
| 1746 | * |
| 1747 | * child - a pointer to the child sysctl table if this entry is a directory, or |
| 1748 | * %NULL. |
| 1749 | * |
| 1750 | * proc_handler - the text handler routine (described below) |
| 1751 | * |
| 1752 | * strategy - the strategy routine (described below) |
| 1753 | * |
| 1754 | * de - for internal use by the sysctl routines |
| 1755 | * |
| 1756 | * extra1, extra2 - extra pointers usable by the proc handler routines |
| 1757 | * |
| 1758 | * Leaf nodes in the sysctl tree will be represented by a single file |
| 1759 | * under /proc; non-leaf nodes will be represented by directories. |
| 1760 | * |
| 1761 | * sysctl(2) can automatically manage read and write requests through |
| 1762 | * the sysctl table. The data and maxlen fields of the ctl_table |
| 1763 | * struct enable minimal validation of the values being written to be |
| 1764 | * performed, and the mode field allows minimal authentication. |
| 1765 | * |
| 1766 | * More sophisticated management can be enabled by the provision of a |
| 1767 | * strategy routine with the table entry. This will be called before |
| 1768 | * any automatic read or write of the data is performed. |
| 1769 | * |
| 1770 | * The strategy routine may return |
| 1771 | * |
| 1772 | * < 0 - Error occurred (error is passed to user process) |
| 1773 | * |
| 1774 | * 0 - OK - proceed with automatic read or write. |
| 1775 | * |
| 1776 | * > 0 - OK - read or write has been done by the strategy routine, so |
| 1777 | * return immediately. |
| 1778 | * |
| 1779 | * There must be a proc_handler routine for any terminal nodes |
| 1780 | * mirrored under /proc/sys (non-terminals are handled by a built-in |
| 1781 | * directory handler). Several default handlers are available to |
| 1782 | * cover common cases - |
| 1783 | * |
| 1784 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), |
| 1785 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), |
| 1786 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() |
| 1787 | * |
| 1788 | * It is the handler's job to read the input buffer from user memory |
| 1789 | * and process it. The handler should return 0 on success. |
| 1790 | * |
| 1791 | * This routine returns %NULL on a failure to register, and a pointer |
| 1792 | * to the table header on success. |
| 1793 | */ |
| 1794 | struct ctl_table_header *__register_sysctl_paths( |
| 1795 | struct ctl_table_root *root, |
| 1796 | struct nsproxy *namespaces, |
| 1797 | const struct ctl_path *path, struct ctl_table *table) |
| 1798 | { |
| 1799 | struct ctl_table_header *header; |
| 1800 | struct ctl_table *new, **prevp; |
| 1801 | unsigned int n, npath; |
| 1802 | struct ctl_table_set *set; |
| 1803 | |
| 1804 | /* Count the path components */ |
| 1805 | for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) |
| 1806 | ; |
| 1807 | |
| 1808 | /* |
| 1809 | * For each path component, allocate a 2-element ctl_table array. |
| 1810 | * The first array element will be filled with the sysctl entry |
| 1811 | * for this, the second will be the sentinel (ctl_name == 0). |
| 1812 | * |
| 1813 | * We allocate everything in one go so that we don't have to |
| 1814 | * worry about freeing additional memory in unregister_sysctl_table. |
| 1815 | */ |
| 1816 | header = kzalloc(sizeof(struct ctl_table_header) + |
| 1817 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); |
| 1818 | if (!header) |
| 1819 | return NULL; |
| 1820 | |
| 1821 | new = (struct ctl_table *) (header + 1); |
| 1822 | |
| 1823 | /* Now connect the dots */ |
| 1824 | prevp = &header->ctl_table; |
| 1825 | for (n = 0; n < npath; ++n, ++path) { |
| 1826 | /* Copy the procname */ |
| 1827 | new->procname = path->procname; |
| 1828 | new->ctl_name = path->ctl_name; |
| 1829 | new->mode = 0555; |
| 1830 | |
| 1831 | *prevp = new; |
| 1832 | prevp = &new->child; |
| 1833 | |
| 1834 | new += 2; |
| 1835 | } |
| 1836 | *prevp = table; |
| 1837 | header->ctl_table_arg = table; |
| 1838 | |
| 1839 | INIT_LIST_HEAD(&header->ctl_entry); |
| 1840 | header->used = 0; |
| 1841 | header->unregistering = NULL; |
| 1842 | header->root = root; |
| 1843 | sysctl_set_parent(NULL, header->ctl_table); |
| 1844 | header->count = 1; |
| 1845 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
| 1846 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
| 1847 | kfree(header); |
| 1848 | return NULL; |
| 1849 | } |
| 1850 | #endif |
| 1851 | spin_lock(&sysctl_lock); |
| 1852 | header->set = lookup_header_set(root, namespaces); |
| 1853 | header->attached_by = header->ctl_table; |
| 1854 | header->attached_to = root_table; |
| 1855 | header->parent = &root_table_header; |
| 1856 | for (set = header->set; set; set = set->parent) { |
| 1857 | struct ctl_table_header *p; |
| 1858 | list_for_each_entry(p, &set->list, ctl_entry) { |
| 1859 | if (p->unregistering) |
| 1860 | continue; |
| 1861 | try_attach(p, header); |
| 1862 | } |
| 1863 | } |
| 1864 | header->parent->count++; |
| 1865 | list_add_tail(&header->ctl_entry, &header->set->list); |
| 1866 | spin_unlock(&sysctl_lock); |
| 1867 | |
| 1868 | return header; |
| 1869 | } |
| 1870 | |
| 1871 | /** |
| 1872 | * register_sysctl_table_path - register a sysctl table hierarchy |
| 1873 | * @path: The path to the directory the sysctl table is in. |
| 1874 | * @table: the top-level table structure |
| 1875 | * |
| 1876 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
| 1877 | * array. A completely 0 filled entry terminates the table. |
| 1878 | * |
| 1879 | * See __register_sysctl_paths for more details. |
| 1880 | */ |
| 1881 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
| 1882 | struct ctl_table *table) |
| 1883 | { |
| 1884 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, |
| 1885 | path, table); |
| 1886 | } |
| 1887 | |
| 1888 | /** |
| 1889 | * register_sysctl_table - register a sysctl table hierarchy |
| 1890 | * @table: the top-level table structure |
| 1891 | * |
| 1892 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
| 1893 | * array. A completely 0 filled entry terminates the table. |
| 1894 | * |
| 1895 | * See register_sysctl_paths for more details. |
| 1896 | */ |
| 1897 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) |
| 1898 | { |
| 1899 | static const struct ctl_path null_path[] = { {} }; |
| 1900 | |
| 1901 | return register_sysctl_paths(null_path, table); |
| 1902 | } |
| 1903 | |
| 1904 | /** |
| 1905 | * unregister_sysctl_table - unregister a sysctl table hierarchy |
| 1906 | * @header: the header returned from register_sysctl_table |
| 1907 | * |
| 1908 | * Unregisters the sysctl table and all children. proc entries may not |
| 1909 | * actually be removed until they are no longer used by anyone. |
| 1910 | */ |
| 1911 | void unregister_sysctl_table(struct ctl_table_header * header) |
| 1912 | { |
| 1913 | might_sleep(); |
| 1914 | |
| 1915 | if (header == NULL) |
| 1916 | return; |
| 1917 | |
| 1918 | spin_lock(&sysctl_lock); |
| 1919 | start_unregistering(header); |
| 1920 | if (!--header->parent->count) { |
| 1921 | WARN_ON(1); |
| 1922 | kfree(header->parent); |
| 1923 | } |
| 1924 | if (!--header->count) |
| 1925 | kfree(header); |
| 1926 | spin_unlock(&sysctl_lock); |
| 1927 | } |
| 1928 | |
| 1929 | int sysctl_is_seen(struct ctl_table_header *p) |
| 1930 | { |
| 1931 | struct ctl_table_set *set = p->set; |
| 1932 | int res; |
| 1933 | spin_lock(&sysctl_lock); |
| 1934 | if (p->unregistering) |
| 1935 | res = 0; |
| 1936 | else if (!set->is_seen) |
| 1937 | res = 1; |
| 1938 | else |
| 1939 | res = set->is_seen(set); |
| 1940 | spin_unlock(&sysctl_lock); |
| 1941 | return res; |
| 1942 | } |
| 1943 | |
| 1944 | void setup_sysctl_set(struct ctl_table_set *p, |
| 1945 | struct ctl_table_set *parent, |
| 1946 | int (*is_seen)(struct ctl_table_set *)) |
| 1947 | { |
| 1948 | INIT_LIST_HEAD(&p->list); |
| 1949 | p->parent = parent ? parent : &sysctl_table_root.default_set; |
| 1950 | p->is_seen = is_seen; |
| 1951 | } |
| 1952 | |
| 1953 | #else /* !CONFIG_SYSCTL */ |
| 1954 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
| 1955 | { |
| 1956 | return NULL; |
| 1957 | } |
| 1958 | |
| 1959 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
| 1960 | struct ctl_table *table) |
| 1961 | { |
| 1962 | return NULL; |
| 1963 | } |
| 1964 | |
| 1965 | void unregister_sysctl_table(struct ctl_table_header * table) |
| 1966 | { |
| 1967 | } |
| 1968 | |
| 1969 | void setup_sysctl_set(struct ctl_table_set *p, |
| 1970 | struct ctl_table_set *parent, |
| 1971 | int (*is_seen)(struct ctl_table_set *)) |
| 1972 | { |
| 1973 | } |
| 1974 | |
| 1975 | void sysctl_head_put(struct ctl_table_header *head) |
| 1976 | { |
| 1977 | } |
| 1978 | |
| 1979 | #endif /* CONFIG_SYSCTL */ |
| 1980 | |
| 1981 | /* |
| 1982 | * /proc/sys support |
| 1983 | */ |
| 1984 | |
| 1985 | #ifdef CONFIG_PROC_SYSCTL |
| 1986 | |
| 1987 | static int _proc_do_string(void* data, int maxlen, int write, |
| 1988 | struct file *filp, void __user *buffer, |
| 1989 | size_t *lenp, loff_t *ppos) |
| 1990 | { |
| 1991 | size_t len; |
| 1992 | char __user *p; |
| 1993 | char c; |
| 1994 | |
| 1995 | if (!data || !maxlen || !*lenp) { |
| 1996 | *lenp = 0; |
| 1997 | return 0; |
| 1998 | } |
| 1999 | |
| 2000 | if (write) { |
| 2001 | len = 0; |
| 2002 | p = buffer; |
| 2003 | while (len < *lenp) { |
| 2004 | if (get_user(c, p++)) |
| 2005 | return -EFAULT; |
| 2006 | if (c == 0 || c == '\n') |
| 2007 | break; |
| 2008 | len++; |
| 2009 | } |
| 2010 | if (len >= maxlen) |
| 2011 | len = maxlen-1; |
| 2012 | if(copy_from_user(data, buffer, len)) |
| 2013 | return -EFAULT; |
| 2014 | ((char *) data)[len] = 0; |
| 2015 | *ppos += *lenp; |
| 2016 | } else { |
| 2017 | len = strlen(data); |
| 2018 | if (len > maxlen) |
| 2019 | len = maxlen; |
| 2020 | |
| 2021 | if (*ppos > len) { |
| 2022 | *lenp = 0; |
| 2023 | return 0; |
| 2024 | } |
| 2025 | |
| 2026 | data += *ppos; |
| 2027 | len -= *ppos; |
| 2028 | |
| 2029 | if (len > *lenp) |
| 2030 | len = *lenp; |
| 2031 | if (len) |
| 2032 | if(copy_to_user(buffer, data, len)) |
| 2033 | return -EFAULT; |
| 2034 | if (len < *lenp) { |
| 2035 | if(put_user('\n', ((char __user *) buffer) + len)) |
| 2036 | return -EFAULT; |
| 2037 | len++; |
| 2038 | } |
| 2039 | *lenp = len; |
| 2040 | *ppos += len; |
| 2041 | } |
| 2042 | return 0; |
| 2043 | } |
| 2044 | |
| 2045 | /** |
| 2046 | * proc_dostring - read a string sysctl |
| 2047 | * @table: the sysctl table |
| 2048 | * @write: %TRUE if this is a write to the sysctl file |
| 2049 | * @filp: the file structure |
| 2050 | * @buffer: the user buffer |
| 2051 | * @lenp: the size of the user buffer |
| 2052 | * @ppos: file position |
| 2053 | * |
| 2054 | * Reads/writes a string from/to the user buffer. If the kernel |
| 2055 | * buffer provided is not large enough to hold the string, the |
| 2056 | * string is truncated. The copied string is %NULL-terminated. |
| 2057 | * If the string is being read by the user process, it is copied |
| 2058 | * and a newline '\n' is added. It is truncated if the buffer is |
| 2059 | * not large enough. |
| 2060 | * |
| 2061 | * Returns 0 on success. |
| 2062 | */ |
| 2063 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, |
| 2064 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2065 | { |
| 2066 | return _proc_do_string(table->data, table->maxlen, write, filp, |
| 2067 | buffer, lenp, ppos); |
| 2068 | } |
| 2069 | |
| 2070 | |
| 2071 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, |
| 2072 | int *valp, |
| 2073 | int write, void *data) |
| 2074 | { |
| 2075 | if (write) { |
| 2076 | *valp = *negp ? -*lvalp : *lvalp; |
| 2077 | } else { |
| 2078 | int val = *valp; |
| 2079 | if (val < 0) { |
| 2080 | *negp = -1; |
| 2081 | *lvalp = (unsigned long)-val; |
| 2082 | } else { |
| 2083 | *negp = 0; |
| 2084 | *lvalp = (unsigned long)val; |
| 2085 | } |
| 2086 | } |
| 2087 | return 0; |
| 2088 | } |
| 2089 | |
| 2090 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
| 2091 | int write, struct file *filp, void __user *buffer, |
| 2092 | size_t *lenp, loff_t *ppos, |
| 2093 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
| 2094 | int write, void *data), |
| 2095 | void *data) |
| 2096 | { |
| 2097 | #define TMPBUFLEN 21 |
| 2098 | int *i, vleft, first=1, neg, val; |
| 2099 | unsigned long lval; |
| 2100 | size_t left, len; |
| 2101 | |
| 2102 | char buf[TMPBUFLEN], *p; |
| 2103 | char __user *s = buffer; |
| 2104 | |
| 2105 | if (!tbl_data || !table->maxlen || !*lenp || |
| 2106 | (*ppos && !write)) { |
| 2107 | *lenp = 0; |
| 2108 | return 0; |
| 2109 | } |
| 2110 | |
| 2111 | i = (int *) tbl_data; |
| 2112 | vleft = table->maxlen / sizeof(*i); |
| 2113 | left = *lenp; |
| 2114 | |
| 2115 | if (!conv) |
| 2116 | conv = do_proc_dointvec_conv; |
| 2117 | |
| 2118 | for (; left && vleft--; i++, first=0) { |
| 2119 | if (write) { |
| 2120 | while (left) { |
| 2121 | char c; |
| 2122 | if (get_user(c, s)) |
| 2123 | return -EFAULT; |
| 2124 | if (!isspace(c)) |
| 2125 | break; |
| 2126 | left--; |
| 2127 | s++; |
| 2128 | } |
| 2129 | if (!left) |
| 2130 | break; |
| 2131 | neg = 0; |
| 2132 | len = left; |
| 2133 | if (len > sizeof(buf) - 1) |
| 2134 | len = sizeof(buf) - 1; |
| 2135 | if (copy_from_user(buf, s, len)) |
| 2136 | return -EFAULT; |
| 2137 | buf[len] = 0; |
| 2138 | p = buf; |
| 2139 | if (*p == '-' && left > 1) { |
| 2140 | neg = 1; |
| 2141 | p++; |
| 2142 | } |
| 2143 | if (*p < '0' || *p > '9') |
| 2144 | break; |
| 2145 | |
| 2146 | lval = simple_strtoul(p, &p, 0); |
| 2147 | |
| 2148 | len = p-buf; |
| 2149 | if ((len < left) && *p && !isspace(*p)) |
| 2150 | break; |
| 2151 | if (neg) |
| 2152 | val = -val; |
| 2153 | s += len; |
| 2154 | left -= len; |
| 2155 | |
| 2156 | if (conv(&neg, &lval, i, 1, data)) |
| 2157 | break; |
| 2158 | } else { |
| 2159 | p = buf; |
| 2160 | if (!first) |
| 2161 | *p++ = '\t'; |
| 2162 | |
| 2163 | if (conv(&neg, &lval, i, 0, data)) |
| 2164 | break; |
| 2165 | |
| 2166 | sprintf(p, "%s%lu", neg ? "-" : "", lval); |
| 2167 | len = strlen(buf); |
| 2168 | if (len > left) |
| 2169 | len = left; |
| 2170 | if(copy_to_user(s, buf, len)) |
| 2171 | return -EFAULT; |
| 2172 | left -= len; |
| 2173 | s += len; |
| 2174 | } |
| 2175 | } |
| 2176 | |
| 2177 | if (!write && !first && left) { |
| 2178 | if(put_user('\n', s)) |
| 2179 | return -EFAULT; |
| 2180 | left--, s++; |
| 2181 | } |
| 2182 | if (write) { |
| 2183 | while (left) { |
| 2184 | char c; |
| 2185 | if (get_user(c, s++)) |
| 2186 | return -EFAULT; |
| 2187 | if (!isspace(c)) |
| 2188 | break; |
| 2189 | left--; |
| 2190 | } |
| 2191 | } |
| 2192 | if (write && first) |
| 2193 | return -EINVAL; |
| 2194 | *lenp -= left; |
| 2195 | *ppos += *lenp; |
| 2196 | return 0; |
| 2197 | #undef TMPBUFLEN |
| 2198 | } |
| 2199 | |
| 2200 | static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
| 2201 | void __user *buffer, size_t *lenp, loff_t *ppos, |
| 2202 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
| 2203 | int write, void *data), |
| 2204 | void *data) |
| 2205 | { |
| 2206 | return __do_proc_dointvec(table->data, table, write, filp, |
| 2207 | buffer, lenp, ppos, conv, data); |
| 2208 | } |
| 2209 | |
| 2210 | /** |
| 2211 | * proc_dointvec - read a vector of integers |
| 2212 | * @table: the sysctl table |
| 2213 | * @write: %TRUE if this is a write to the sysctl file |
| 2214 | * @filp: the file structure |
| 2215 | * @buffer: the user buffer |
| 2216 | * @lenp: the size of the user buffer |
| 2217 | * @ppos: file position |
| 2218 | * |
| 2219 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| 2220 | * values from/to the user buffer, treated as an ASCII string. |
| 2221 | * |
| 2222 | * Returns 0 on success. |
| 2223 | */ |
| 2224 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
| 2225 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2226 | { |
| 2227 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
| 2228 | NULL,NULL); |
| 2229 | } |
| 2230 | |
| 2231 | #define OP_SET 0 |
| 2232 | #define OP_AND 1 |
| 2233 | #define OP_OR 2 |
| 2234 | |
| 2235 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, |
| 2236 | int *valp, |
| 2237 | int write, void *data) |
| 2238 | { |
| 2239 | int op = *(int *)data; |
| 2240 | if (write) { |
| 2241 | int val = *negp ? -*lvalp : *lvalp; |
| 2242 | switch(op) { |
| 2243 | case OP_SET: *valp = val; break; |
| 2244 | case OP_AND: *valp &= val; break; |
| 2245 | case OP_OR: *valp |= val; break; |
| 2246 | } |
| 2247 | } else { |
| 2248 | int val = *valp; |
| 2249 | if (val < 0) { |
| 2250 | *negp = -1; |
| 2251 | *lvalp = (unsigned long)-val; |
| 2252 | } else { |
| 2253 | *negp = 0; |
| 2254 | *lvalp = (unsigned long)val; |
| 2255 | } |
| 2256 | } |
| 2257 | return 0; |
| 2258 | } |
| 2259 | |
| 2260 | /* |
| 2261 | * Taint values can only be increased |
| 2262 | */ |
| 2263 | static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, |
| 2264 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2265 | { |
| 2266 | int op; |
| 2267 | |
| 2268 | if (write && !capable(CAP_SYS_ADMIN)) |
| 2269 | return -EPERM; |
| 2270 | |
| 2271 | op = OP_OR; |
| 2272 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
| 2273 | do_proc_dointvec_bset_conv,&op); |
| 2274 | } |
| 2275 | |
| 2276 | struct do_proc_dointvec_minmax_conv_param { |
| 2277 | int *min; |
| 2278 | int *max; |
| 2279 | }; |
| 2280 | |
| 2281 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, |
| 2282 | int *valp, |
| 2283 | int write, void *data) |
| 2284 | { |
| 2285 | struct do_proc_dointvec_minmax_conv_param *param = data; |
| 2286 | if (write) { |
| 2287 | int val = *negp ? -*lvalp : *lvalp; |
| 2288 | if ((param->min && *param->min > val) || |
| 2289 | (param->max && *param->max < val)) |
| 2290 | return -EINVAL; |
| 2291 | *valp = val; |
| 2292 | } else { |
| 2293 | int val = *valp; |
| 2294 | if (val < 0) { |
| 2295 | *negp = -1; |
| 2296 | *lvalp = (unsigned long)-val; |
| 2297 | } else { |
| 2298 | *negp = 0; |
| 2299 | *lvalp = (unsigned long)val; |
| 2300 | } |
| 2301 | } |
| 2302 | return 0; |
| 2303 | } |
| 2304 | |
| 2305 | /** |
| 2306 | * proc_dointvec_minmax - read a vector of integers with min/max values |
| 2307 | * @table: the sysctl table |
| 2308 | * @write: %TRUE if this is a write to the sysctl file |
| 2309 | * @filp: the file structure |
| 2310 | * @buffer: the user buffer |
| 2311 | * @lenp: the size of the user buffer |
| 2312 | * @ppos: file position |
| 2313 | * |
| 2314 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| 2315 | * values from/to the user buffer, treated as an ASCII string. |
| 2316 | * |
| 2317 | * This routine will ensure the values are within the range specified by |
| 2318 | * table->extra1 (min) and table->extra2 (max). |
| 2319 | * |
| 2320 | * Returns 0 on success. |
| 2321 | */ |
| 2322 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, |
| 2323 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2324 | { |
| 2325 | struct do_proc_dointvec_minmax_conv_param param = { |
| 2326 | .min = (int *) table->extra1, |
| 2327 | .max = (int *) table->extra2, |
| 2328 | }; |
| 2329 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, |
| 2330 | do_proc_dointvec_minmax_conv, ¶m); |
| 2331 | } |
| 2332 | |
| 2333 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
| 2334 | struct file *filp, |
| 2335 | void __user *buffer, |
| 2336 | size_t *lenp, loff_t *ppos, |
| 2337 | unsigned long convmul, |
| 2338 | unsigned long convdiv) |
| 2339 | { |
| 2340 | #define TMPBUFLEN 21 |
| 2341 | unsigned long *i, *min, *max, val; |
| 2342 | int vleft, first=1, neg; |
| 2343 | size_t len, left; |
| 2344 | char buf[TMPBUFLEN], *p; |
| 2345 | char __user *s = buffer; |
| 2346 | |
| 2347 | if (!data || !table->maxlen || !*lenp || |
| 2348 | (*ppos && !write)) { |
| 2349 | *lenp = 0; |
| 2350 | return 0; |
| 2351 | } |
| 2352 | |
| 2353 | i = (unsigned long *) data; |
| 2354 | min = (unsigned long *) table->extra1; |
| 2355 | max = (unsigned long *) table->extra2; |
| 2356 | vleft = table->maxlen / sizeof(unsigned long); |
| 2357 | left = *lenp; |
| 2358 | |
| 2359 | for (; left && vleft--; i++, min++, max++, first=0) { |
| 2360 | if (write) { |
| 2361 | while (left) { |
| 2362 | char c; |
| 2363 | if (get_user(c, s)) |
| 2364 | return -EFAULT; |
| 2365 | if (!isspace(c)) |
| 2366 | break; |
| 2367 | left--; |
| 2368 | s++; |
| 2369 | } |
| 2370 | if (!left) |
| 2371 | break; |
| 2372 | neg = 0; |
| 2373 | len = left; |
| 2374 | if (len > TMPBUFLEN-1) |
| 2375 | len = TMPBUFLEN-1; |
| 2376 | if (copy_from_user(buf, s, len)) |
| 2377 | return -EFAULT; |
| 2378 | buf[len] = 0; |
| 2379 | p = buf; |
| 2380 | if (*p == '-' && left > 1) { |
| 2381 | neg = 1; |
| 2382 | p++; |
| 2383 | } |
| 2384 | if (*p < '0' || *p > '9') |
| 2385 | break; |
| 2386 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; |
| 2387 | len = p-buf; |
| 2388 | if ((len < left) && *p && !isspace(*p)) |
| 2389 | break; |
| 2390 | if (neg) |
| 2391 | val = -val; |
| 2392 | s += len; |
| 2393 | left -= len; |
| 2394 | |
| 2395 | if(neg) |
| 2396 | continue; |
| 2397 | if ((min && val < *min) || (max && val > *max)) |
| 2398 | continue; |
| 2399 | *i = val; |
| 2400 | } else { |
| 2401 | p = buf; |
| 2402 | if (!first) |
| 2403 | *p++ = '\t'; |
| 2404 | sprintf(p, "%lu", convdiv * (*i) / convmul); |
| 2405 | len = strlen(buf); |
| 2406 | if (len > left) |
| 2407 | len = left; |
| 2408 | if(copy_to_user(s, buf, len)) |
| 2409 | return -EFAULT; |
| 2410 | left -= len; |
| 2411 | s += len; |
| 2412 | } |
| 2413 | } |
| 2414 | |
| 2415 | if (!write && !first && left) { |
| 2416 | if(put_user('\n', s)) |
| 2417 | return -EFAULT; |
| 2418 | left--, s++; |
| 2419 | } |
| 2420 | if (write) { |
| 2421 | while (left) { |
| 2422 | char c; |
| 2423 | if (get_user(c, s++)) |
| 2424 | return -EFAULT; |
| 2425 | if (!isspace(c)) |
| 2426 | break; |
| 2427 | left--; |
| 2428 | } |
| 2429 | } |
| 2430 | if (write && first) |
| 2431 | return -EINVAL; |
| 2432 | *lenp -= left; |
| 2433 | *ppos += *lenp; |
| 2434 | return 0; |
| 2435 | #undef TMPBUFLEN |
| 2436 | } |
| 2437 | |
| 2438 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
| 2439 | struct file *filp, |
| 2440 | void __user *buffer, |
| 2441 | size_t *lenp, loff_t *ppos, |
| 2442 | unsigned long convmul, |
| 2443 | unsigned long convdiv) |
| 2444 | { |
| 2445 | return __do_proc_doulongvec_minmax(table->data, table, write, |
| 2446 | filp, buffer, lenp, ppos, convmul, convdiv); |
| 2447 | } |
| 2448 | |
| 2449 | /** |
| 2450 | * proc_doulongvec_minmax - read a vector of long integers with min/max values |
| 2451 | * @table: the sysctl table |
| 2452 | * @write: %TRUE if this is a write to the sysctl file |
| 2453 | * @filp: the file structure |
| 2454 | * @buffer: the user buffer |
| 2455 | * @lenp: the size of the user buffer |
| 2456 | * @ppos: file position |
| 2457 | * |
| 2458 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
| 2459 | * values from/to the user buffer, treated as an ASCII string. |
| 2460 | * |
| 2461 | * This routine will ensure the values are within the range specified by |
| 2462 | * table->extra1 (min) and table->extra2 (max). |
| 2463 | * |
| 2464 | * Returns 0 on success. |
| 2465 | */ |
| 2466 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, |
| 2467 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2468 | { |
| 2469 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); |
| 2470 | } |
| 2471 | |
| 2472 | /** |
| 2473 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values |
| 2474 | * @table: the sysctl table |
| 2475 | * @write: %TRUE if this is a write to the sysctl file |
| 2476 | * @filp: the file structure |
| 2477 | * @buffer: the user buffer |
| 2478 | * @lenp: the size of the user buffer |
| 2479 | * @ppos: file position |
| 2480 | * |
| 2481 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
| 2482 | * values from/to the user buffer, treated as an ASCII string. The values |
| 2483 | * are treated as milliseconds, and converted to jiffies when they are stored. |
| 2484 | * |
| 2485 | * This routine will ensure the values are within the range specified by |
| 2486 | * table->extra1 (min) and table->extra2 (max). |
| 2487 | * |
| 2488 | * Returns 0 on success. |
| 2489 | */ |
| 2490 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
| 2491 | struct file *filp, |
| 2492 | void __user *buffer, |
| 2493 | size_t *lenp, loff_t *ppos) |
| 2494 | { |
| 2495 | return do_proc_doulongvec_minmax(table, write, filp, buffer, |
| 2496 | lenp, ppos, HZ, 1000l); |
| 2497 | } |
| 2498 | |
| 2499 | |
| 2500 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, |
| 2501 | int *valp, |
| 2502 | int write, void *data) |
| 2503 | { |
| 2504 | if (write) { |
| 2505 | if (*lvalp > LONG_MAX / HZ) |
| 2506 | return 1; |
| 2507 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
| 2508 | } else { |
| 2509 | int val = *valp; |
| 2510 | unsigned long lval; |
| 2511 | if (val < 0) { |
| 2512 | *negp = -1; |
| 2513 | lval = (unsigned long)-val; |
| 2514 | } else { |
| 2515 | *negp = 0; |
| 2516 | lval = (unsigned long)val; |
| 2517 | } |
| 2518 | *lvalp = lval / HZ; |
| 2519 | } |
| 2520 | return 0; |
| 2521 | } |
| 2522 | |
| 2523 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, |
| 2524 | int *valp, |
| 2525 | int write, void *data) |
| 2526 | { |
| 2527 | if (write) { |
| 2528 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
| 2529 | return 1; |
| 2530 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
| 2531 | } else { |
| 2532 | int val = *valp; |
| 2533 | unsigned long lval; |
| 2534 | if (val < 0) { |
| 2535 | *negp = -1; |
| 2536 | lval = (unsigned long)-val; |
| 2537 | } else { |
| 2538 | *negp = 0; |
| 2539 | lval = (unsigned long)val; |
| 2540 | } |
| 2541 | *lvalp = jiffies_to_clock_t(lval); |
| 2542 | } |
| 2543 | return 0; |
| 2544 | } |
| 2545 | |
| 2546 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, |
| 2547 | int *valp, |
| 2548 | int write, void *data) |
| 2549 | { |
| 2550 | if (write) { |
| 2551 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
| 2552 | } else { |
| 2553 | int val = *valp; |
| 2554 | unsigned long lval; |
| 2555 | if (val < 0) { |
| 2556 | *negp = -1; |
| 2557 | lval = (unsigned long)-val; |
| 2558 | } else { |
| 2559 | *negp = 0; |
| 2560 | lval = (unsigned long)val; |
| 2561 | } |
| 2562 | *lvalp = jiffies_to_msecs(lval); |
| 2563 | } |
| 2564 | return 0; |
| 2565 | } |
| 2566 | |
| 2567 | /** |
| 2568 | * proc_dointvec_jiffies - read a vector of integers as seconds |
| 2569 | * @table: the sysctl table |
| 2570 | * @write: %TRUE if this is a write to the sysctl file |
| 2571 | * @filp: the file structure |
| 2572 | * @buffer: the user buffer |
| 2573 | * @lenp: the size of the user buffer |
| 2574 | * @ppos: file position |
| 2575 | * |
| 2576 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| 2577 | * values from/to the user buffer, treated as an ASCII string. |
| 2578 | * The values read are assumed to be in seconds, and are converted into |
| 2579 | * jiffies. |
| 2580 | * |
| 2581 | * Returns 0 on success. |
| 2582 | */ |
| 2583 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, |
| 2584 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2585 | { |
| 2586 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
| 2587 | do_proc_dointvec_jiffies_conv,NULL); |
| 2588 | } |
| 2589 | |
| 2590 | /** |
| 2591 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds |
| 2592 | * @table: the sysctl table |
| 2593 | * @write: %TRUE if this is a write to the sysctl file |
| 2594 | * @filp: the file structure |
| 2595 | * @buffer: the user buffer |
| 2596 | * @lenp: the size of the user buffer |
| 2597 | * @ppos: pointer to the file position |
| 2598 | * |
| 2599 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| 2600 | * values from/to the user buffer, treated as an ASCII string. |
| 2601 | * The values read are assumed to be in 1/USER_HZ seconds, and |
| 2602 | * are converted into jiffies. |
| 2603 | * |
| 2604 | * Returns 0 on success. |
| 2605 | */ |
| 2606 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, |
| 2607 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2608 | { |
| 2609 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
| 2610 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
| 2611 | } |
| 2612 | |
| 2613 | /** |
| 2614 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds |
| 2615 | * @table: the sysctl table |
| 2616 | * @write: %TRUE if this is a write to the sysctl file |
| 2617 | * @filp: the file structure |
| 2618 | * @buffer: the user buffer |
| 2619 | * @lenp: the size of the user buffer |
| 2620 | * @ppos: file position |
| 2621 | * @ppos: the current position in the file |
| 2622 | * |
| 2623 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| 2624 | * values from/to the user buffer, treated as an ASCII string. |
| 2625 | * The values read are assumed to be in 1/1000 seconds, and |
| 2626 | * are converted into jiffies. |
| 2627 | * |
| 2628 | * Returns 0 on success. |
| 2629 | */ |
| 2630 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, |
| 2631 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2632 | { |
| 2633 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, |
| 2634 | do_proc_dointvec_ms_jiffies_conv, NULL); |
| 2635 | } |
| 2636 | |
| 2637 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
| 2638 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2639 | { |
| 2640 | struct pid *new_pid; |
| 2641 | pid_t tmp; |
| 2642 | int r; |
| 2643 | |
| 2644 | tmp = pid_vnr(cad_pid); |
| 2645 | |
| 2646 | r = __do_proc_dointvec(&tmp, table, write, filp, buffer, |
| 2647 | lenp, ppos, NULL, NULL); |
| 2648 | if (r || !write) |
| 2649 | return r; |
| 2650 | |
| 2651 | new_pid = find_get_pid(tmp); |
| 2652 | if (!new_pid) |
| 2653 | return -ESRCH; |
| 2654 | |
| 2655 | put_pid(xchg(&cad_pid, new_pid)); |
| 2656 | return 0; |
| 2657 | } |
| 2658 | |
| 2659 | #else /* CONFIG_PROC_FS */ |
| 2660 | |
| 2661 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, |
| 2662 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2663 | { |
| 2664 | return -ENOSYS; |
| 2665 | } |
| 2666 | |
| 2667 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
| 2668 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2669 | { |
| 2670 | return -ENOSYS; |
| 2671 | } |
| 2672 | |
| 2673 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, |
| 2674 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2675 | { |
| 2676 | return -ENOSYS; |
| 2677 | } |
| 2678 | |
| 2679 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, |
| 2680 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2681 | { |
| 2682 | return -ENOSYS; |
| 2683 | } |
| 2684 | |
| 2685 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, |
| 2686 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2687 | { |
| 2688 | return -ENOSYS; |
| 2689 | } |
| 2690 | |
| 2691 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, |
| 2692 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2693 | { |
| 2694 | return -ENOSYS; |
| 2695 | } |
| 2696 | |
| 2697 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, |
| 2698 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2699 | { |
| 2700 | return -ENOSYS; |
| 2701 | } |
| 2702 | |
| 2703 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
| 2704 | struct file *filp, |
| 2705 | void __user *buffer, |
| 2706 | size_t *lenp, loff_t *ppos) |
| 2707 | { |
| 2708 | return -ENOSYS; |
| 2709 | } |
| 2710 | |
| 2711 | |
| 2712 | #endif /* CONFIG_PROC_FS */ |
| 2713 | |
| 2714 | |
| 2715 | #ifdef CONFIG_SYSCTL_SYSCALL |
| 2716 | /* |
| 2717 | * General sysctl support routines |
| 2718 | */ |
| 2719 | |
| 2720 | /* The generic sysctl data routine (used if no strategy routine supplied) */ |
| 2721 | int sysctl_data(struct ctl_table *table, int __user *name, int nlen, |
| 2722 | void __user *oldval, size_t __user *oldlenp, |
| 2723 | void __user *newval, size_t newlen) |
| 2724 | { |
| 2725 | size_t len; |
| 2726 | |
| 2727 | /* Get out of I don't have a variable */ |
| 2728 | if (!table->data || !table->maxlen) |
| 2729 | return -ENOTDIR; |
| 2730 | |
| 2731 | if (oldval && oldlenp) { |
| 2732 | if (get_user(len, oldlenp)) |
| 2733 | return -EFAULT; |
| 2734 | if (len) { |
| 2735 | if (len > table->maxlen) |
| 2736 | len = table->maxlen; |
| 2737 | if (copy_to_user(oldval, table->data, len)) |
| 2738 | return -EFAULT; |
| 2739 | if (put_user(len, oldlenp)) |
| 2740 | return -EFAULT; |
| 2741 | } |
| 2742 | } |
| 2743 | |
| 2744 | if (newval && newlen) { |
| 2745 | if (newlen > table->maxlen) |
| 2746 | newlen = table->maxlen; |
| 2747 | |
| 2748 | if (copy_from_user(table->data, newval, newlen)) |
| 2749 | return -EFAULT; |
| 2750 | } |
| 2751 | return 1; |
| 2752 | } |
| 2753 | |
| 2754 | /* The generic string strategy routine: */ |
| 2755 | int sysctl_string(struct ctl_table *table, int __user *name, int nlen, |
| 2756 | void __user *oldval, size_t __user *oldlenp, |
| 2757 | void __user *newval, size_t newlen) |
| 2758 | { |
| 2759 | if (!table->data || !table->maxlen) |
| 2760 | return -ENOTDIR; |
| 2761 | |
| 2762 | if (oldval && oldlenp) { |
| 2763 | size_t bufsize; |
| 2764 | if (get_user(bufsize, oldlenp)) |
| 2765 | return -EFAULT; |
| 2766 | if (bufsize) { |
| 2767 | size_t len = strlen(table->data), copied; |
| 2768 | |
| 2769 | /* This shouldn't trigger for a well-formed sysctl */ |
| 2770 | if (len > table->maxlen) |
| 2771 | len = table->maxlen; |
| 2772 | |
| 2773 | /* Copy up to a max of bufsize-1 bytes of the string */ |
| 2774 | copied = (len >= bufsize) ? bufsize - 1 : len; |
| 2775 | |
| 2776 | if (copy_to_user(oldval, table->data, copied) || |
| 2777 | put_user(0, (char __user *)(oldval + copied))) |
| 2778 | return -EFAULT; |
| 2779 | if (put_user(len, oldlenp)) |
| 2780 | return -EFAULT; |
| 2781 | } |
| 2782 | } |
| 2783 | if (newval && newlen) { |
| 2784 | size_t len = newlen; |
| 2785 | if (len > table->maxlen) |
| 2786 | len = table->maxlen; |
| 2787 | if(copy_from_user(table->data, newval, len)) |
| 2788 | return -EFAULT; |
| 2789 | if (len == table->maxlen) |
| 2790 | len--; |
| 2791 | ((char *) table->data)[len] = 0; |
| 2792 | } |
| 2793 | return 1; |
| 2794 | } |
| 2795 | |
| 2796 | /* |
| 2797 | * This function makes sure that all of the integers in the vector |
| 2798 | * are between the minimum and maximum values given in the arrays |
| 2799 | * table->extra1 and table->extra2, respectively. |
| 2800 | */ |
| 2801 | int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, |
| 2802 | void __user *oldval, size_t __user *oldlenp, |
| 2803 | void __user *newval, size_t newlen) |
| 2804 | { |
| 2805 | |
| 2806 | if (newval && newlen) { |
| 2807 | int __user *vec = (int __user *) newval; |
| 2808 | int *min = (int *) table->extra1; |
| 2809 | int *max = (int *) table->extra2; |
| 2810 | size_t length; |
| 2811 | int i; |
| 2812 | |
| 2813 | if (newlen % sizeof(int) != 0) |
| 2814 | return -EINVAL; |
| 2815 | |
| 2816 | if (!table->extra1 && !table->extra2) |
| 2817 | return 0; |
| 2818 | |
| 2819 | if (newlen > table->maxlen) |
| 2820 | newlen = table->maxlen; |
| 2821 | length = newlen / sizeof(int); |
| 2822 | |
| 2823 | for (i = 0; i < length; i++) { |
| 2824 | int value; |
| 2825 | if (get_user(value, vec + i)) |
| 2826 | return -EFAULT; |
| 2827 | if (min && value < min[i]) |
| 2828 | return -EINVAL; |
| 2829 | if (max && value > max[i]) |
| 2830 | return -EINVAL; |
| 2831 | } |
| 2832 | } |
| 2833 | return 0; |
| 2834 | } |
| 2835 | |
| 2836 | /* Strategy function to convert jiffies to seconds */ |
| 2837 | int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, |
| 2838 | void __user *oldval, size_t __user *oldlenp, |
| 2839 | void __user *newval, size_t newlen) |
| 2840 | { |
| 2841 | if (oldval && oldlenp) { |
| 2842 | size_t olen; |
| 2843 | |
| 2844 | if (get_user(olen, oldlenp)) |
| 2845 | return -EFAULT; |
| 2846 | if (olen) { |
| 2847 | int val; |
| 2848 | |
| 2849 | if (olen < sizeof(int)) |
| 2850 | return -EINVAL; |
| 2851 | |
| 2852 | val = *(int *)(table->data) / HZ; |
| 2853 | if (put_user(val, (int __user *)oldval)) |
| 2854 | return -EFAULT; |
| 2855 | if (put_user(sizeof(int), oldlenp)) |
| 2856 | return -EFAULT; |
| 2857 | } |
| 2858 | } |
| 2859 | if (newval && newlen) { |
| 2860 | int new; |
| 2861 | if (newlen != sizeof(int)) |
| 2862 | return -EINVAL; |
| 2863 | if (get_user(new, (int __user *)newval)) |
| 2864 | return -EFAULT; |
| 2865 | *(int *)(table->data) = new*HZ; |
| 2866 | } |
| 2867 | return 1; |
| 2868 | } |
| 2869 | |
| 2870 | /* Strategy function to convert jiffies to seconds */ |
| 2871 | int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, |
| 2872 | void __user *oldval, size_t __user *oldlenp, |
| 2873 | void __user *newval, size_t newlen) |
| 2874 | { |
| 2875 | if (oldval && oldlenp) { |
| 2876 | size_t olen; |
| 2877 | |
| 2878 | if (get_user(olen, oldlenp)) |
| 2879 | return -EFAULT; |
| 2880 | if (olen) { |
| 2881 | int val; |
| 2882 | |
| 2883 | if (olen < sizeof(int)) |
| 2884 | return -EINVAL; |
| 2885 | |
| 2886 | val = jiffies_to_msecs(*(int *)(table->data)); |
| 2887 | if (put_user(val, (int __user *)oldval)) |
| 2888 | return -EFAULT; |
| 2889 | if (put_user(sizeof(int), oldlenp)) |
| 2890 | return -EFAULT; |
| 2891 | } |
| 2892 | } |
| 2893 | if (newval && newlen) { |
| 2894 | int new; |
| 2895 | if (newlen != sizeof(int)) |
| 2896 | return -EINVAL; |
| 2897 | if (get_user(new, (int __user *)newval)) |
| 2898 | return -EFAULT; |
| 2899 | *(int *)(table->data) = msecs_to_jiffies(new); |
| 2900 | } |
| 2901 | return 1; |
| 2902 | } |
| 2903 | |
| 2904 | |
| 2905 | |
| 2906 | #else /* CONFIG_SYSCTL_SYSCALL */ |
| 2907 | |
| 2908 | |
| 2909 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) |
| 2910 | { |
| 2911 | struct __sysctl_args tmp; |
| 2912 | int error; |
| 2913 | |
| 2914 | if (copy_from_user(&tmp, args, sizeof(tmp))) |
| 2915 | return -EFAULT; |
| 2916 | |
| 2917 | error = deprecated_sysctl_warning(&tmp); |
| 2918 | |
| 2919 | /* If no error reading the parameters then just -ENOSYS ... */ |
| 2920 | if (!error) |
| 2921 | error = -ENOSYS; |
| 2922 | |
| 2923 | return error; |
| 2924 | } |
| 2925 | |
| 2926 | int sysctl_data(struct ctl_table *table, int __user *name, int nlen, |
| 2927 | void __user *oldval, size_t __user *oldlenp, |
| 2928 | void __user *newval, size_t newlen) |
| 2929 | { |
| 2930 | return -ENOSYS; |
| 2931 | } |
| 2932 | |
| 2933 | int sysctl_string(struct ctl_table *table, int __user *name, int nlen, |
| 2934 | void __user *oldval, size_t __user *oldlenp, |
| 2935 | void __user *newval, size_t newlen) |
| 2936 | { |
| 2937 | return -ENOSYS; |
| 2938 | } |
| 2939 | |
| 2940 | int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, |
| 2941 | void __user *oldval, size_t __user *oldlenp, |
| 2942 | void __user *newval, size_t newlen) |
| 2943 | { |
| 2944 | return -ENOSYS; |
| 2945 | } |
| 2946 | |
| 2947 | int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, |
| 2948 | void __user *oldval, size_t __user *oldlenp, |
| 2949 | void __user *newval, size_t newlen) |
| 2950 | { |
| 2951 | return -ENOSYS; |
| 2952 | } |
| 2953 | |
| 2954 | int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, |
| 2955 | void __user *oldval, size_t __user *oldlenp, |
| 2956 | void __user *newval, size_t newlen) |
| 2957 | { |
| 2958 | return -ENOSYS; |
| 2959 | } |
| 2960 | |
| 2961 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
| 2962 | |
| 2963 | static int deprecated_sysctl_warning(struct __sysctl_args *args) |
| 2964 | { |
| 2965 | static int msg_count; |
| 2966 | int name[CTL_MAXNAME]; |
| 2967 | int i; |
| 2968 | |
| 2969 | /* Check args->nlen. */ |
| 2970 | if (args->nlen < 0 || args->nlen > CTL_MAXNAME) |
| 2971 | return -ENOTDIR; |
| 2972 | |
| 2973 | /* Read in the sysctl name for better debug message logging */ |
| 2974 | for (i = 0; i < args->nlen; i++) |
| 2975 | if (get_user(name[i], args->name + i)) |
| 2976 | return -EFAULT; |
| 2977 | |
| 2978 | /* Ignore accesses to kernel.version */ |
| 2979 | if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) |
| 2980 | return 0; |
| 2981 | |
| 2982 | if (msg_count < 5) { |
| 2983 | msg_count++; |
| 2984 | printk(KERN_INFO |
| 2985 | "warning: process `%s' used the deprecated sysctl " |
| 2986 | "system call with ", current->comm); |
| 2987 | for (i = 0; i < args->nlen; i++) |
| 2988 | printk("%d.", name[i]); |
| 2989 | printk("\n"); |
| 2990 | } |
| 2991 | return 0; |
| 2992 | } |
| 2993 | |
| 2994 | /* |
| 2995 | * No sense putting this after each symbol definition, twice, |
| 2996 | * exception granted :-) |
| 2997 | */ |
| 2998 | EXPORT_SYMBOL(proc_dointvec); |
| 2999 | EXPORT_SYMBOL(proc_dointvec_jiffies); |
| 3000 | EXPORT_SYMBOL(proc_dointvec_minmax); |
| 3001 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); |
| 3002 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); |
| 3003 | EXPORT_SYMBOL(proc_dostring); |
| 3004 | EXPORT_SYMBOL(proc_doulongvec_minmax); |
| 3005 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); |
| 3006 | EXPORT_SYMBOL(register_sysctl_table); |
| 3007 | EXPORT_SYMBOL(register_sysctl_paths); |
| 3008 | EXPORT_SYMBOL(sysctl_intvec); |
| 3009 | EXPORT_SYMBOL(sysctl_jiffies); |
| 3010 | EXPORT_SYMBOL(sysctl_ms_jiffies); |
| 3011 | EXPORT_SYMBOL(sysctl_string); |
| 3012 | EXPORT_SYMBOL(sysctl_data); |
| 3013 | EXPORT_SYMBOL(unregister_sysctl_table); |