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/kmemcheck.h> 31 #include <linux/smp_lock.h> 32 #include <linux/fs.h> 33 #include <linux/init.h> 34 #include <linux/kernel.h> 35 #include <linux/kobject.h> 36 #include <linux/net.h> 37 #include <linux/sysrq.h> 38 #include <linux/highuid.h> 39 #include <linux/writeback.h> 40 #include <linux/hugetlb.h> 41 #include <linux/initrd.h> 42 #include <linux/key.h> 43 #include <linux/times.h> 44 #include <linux/limits.h> 45 #include <linux/dcache.h> 46 #include <linux/syscalls.h> 47 #include <linux/vmstat.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/acpi.h> 50 #include <linux/reboot.h> 51 #include <linux/ftrace.h> 52 #include <linux/slow-work.h> 53 #include <linux/perf_counter.h> 54 55 #include <asm/uaccess.h> 56 #include <asm/processor.h> 57 58 #ifdef CONFIG_X86 59 #include <asm/nmi.h> 60 #include <asm/stacktrace.h> 61 #include <asm/io.h> 62 #endif 63 64 static int deprecated_sysctl_warning(struct __sysctl_args *args); 65 66 #if defined(CONFIG_SYSCTL) 67 68 /* External variables not in a header file. */ 69 extern int C_A_D; 70 extern int print_fatal_signals; 71 extern int sysctl_overcommit_memory; 72 extern int sysctl_overcommit_ratio; 73 extern int sysctl_panic_on_oom; 74 extern int sysctl_oom_kill_allocating_task; 75 extern int sysctl_oom_dump_tasks; 76 extern int max_threads; 77 extern int core_uses_pid; 78 extern int suid_dumpable; 79 extern char core_pattern[]; 80 extern int pid_max; 81 extern int min_free_kbytes; 82 extern int pid_max_min, pid_max_max; 83 extern int sysctl_drop_caches; 84 extern int percpu_pagelist_fraction; 85 extern int compat_log; 86 extern int latencytop_enabled; 87 extern int sysctl_nr_open_min, sysctl_nr_open_max; 88 #ifndef CONFIG_MMU 89 extern int sysctl_nr_trim_pages; 90 #endif 91 #ifdef CONFIG_RCU_TORTURE_TEST 92 extern int rcutorture_runnable; 93 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ 94 95 /* Constants used for minimum and maximum */ 96 #ifdef CONFIG_DETECT_SOFTLOCKUP 97 static int sixty = 60; 98 static int neg_one = -1; 99 #endif 100 101 static int zero; 102 static int __maybe_unused one = 1; 103 static int __maybe_unused two = 2; 104 static unsigned long one_ul = 1; 105 static int one_hundred = 100; 106 107 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 108 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 109 110 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 111 static int maxolduid = 65535; 112 static int minolduid; 113 static int min_percpu_pagelist_fract = 8; 114 115 static int ngroups_max = NGROUPS_MAX; 116 117 #ifdef CONFIG_MODULES 118 extern char modprobe_path[]; 119 extern int modules_disabled; 120 #endif 121 #ifdef CONFIG_CHR_DEV_SG 122 extern int sg_big_buff; 123 #endif 124 125 #ifdef CONFIG_SPARC 126 #include <asm/system.h> 127 #endif 128 129 #ifdef CONFIG_SPARC64 130 extern int sysctl_tsb_ratio; 131 #endif 132 133 #ifdef __hppa__ 134 extern int pwrsw_enabled; 135 extern int unaligned_enabled; 136 #endif 137 138 #ifdef CONFIG_S390 139 #ifdef CONFIG_MATHEMU 140 extern int sysctl_ieee_emulation_warnings; 141 #endif 142 extern int sysctl_userprocess_debug; 143 extern int spin_retry; 144 #endif 145 146 #ifdef CONFIG_BSD_PROCESS_ACCT 147 extern int acct_parm[]; 148 #endif 149 150 #ifdef CONFIG_IA64 151 extern int no_unaligned_warning; 152 extern int unaligned_dump_stack; 153 #endif 154 155 #ifdef CONFIG_RT_MUTEXES 156 extern int max_lock_depth; 157 #endif 158 159 #ifdef CONFIG_PROC_SYSCTL 160 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 161 void __user *buffer, size_t *lenp, loff_t *ppos); 162 static int proc_taint(struct ctl_table *table, int write, struct file *filp, 163 void __user *buffer, size_t *lenp, loff_t *ppos); 164 #endif 165 166 static struct ctl_table root_table[]; 167 static struct ctl_table_root sysctl_table_root; 168 static struct ctl_table_header root_table_header = { 169 .count = 1, 170 .ctl_table = root_table, 171 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 172 .root = &sysctl_table_root, 173 .set = &sysctl_table_root.default_set, 174 }; 175 static struct ctl_table_root sysctl_table_root = { 176 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 177 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 178 }; 179 180 static struct ctl_table kern_table[]; 181 static struct ctl_table vm_table[]; 182 static struct ctl_table fs_table[]; 183 static struct ctl_table debug_table[]; 184 static struct ctl_table dev_table[]; 185 extern struct ctl_table random_table[]; 186 #ifdef CONFIG_INOTIFY_USER 187 extern struct ctl_table inotify_table[]; 188 #endif 189 #ifdef CONFIG_EPOLL 190 extern struct ctl_table epoll_table[]; 191 #endif 192 193 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 194 int sysctl_legacy_va_layout; 195 #endif 196 197 extern int prove_locking; 198 extern int lock_stat; 199 200 /* The default sysctl tables: */ 201 202 static struct ctl_table root_table[] = { 203 { 204 .ctl_name = CTL_KERN, 205 .procname = "kernel", 206 .mode = 0555, 207 .child = kern_table, 208 }, 209 { 210 .ctl_name = CTL_VM, 211 .procname = "vm", 212 .mode = 0555, 213 .child = vm_table, 214 }, 215 { 216 .ctl_name = CTL_FS, 217 .procname = "fs", 218 .mode = 0555, 219 .child = fs_table, 220 }, 221 { 222 .ctl_name = CTL_DEBUG, 223 .procname = "debug", 224 .mode = 0555, 225 .child = debug_table, 226 }, 227 { 228 .ctl_name = CTL_DEV, 229 .procname = "dev", 230 .mode = 0555, 231 .child = dev_table, 232 }, 233 /* 234 * NOTE: do not add new entries to this table unless you have read 235 * Documentation/sysctl/ctl_unnumbered.txt 236 */ 237 { .ctl_name = 0 } 238 }; 239 240 #ifdef CONFIG_SCHED_DEBUG 241 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 242 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 243 static int min_wakeup_granularity_ns; /* 0 usecs */ 244 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 245 #endif 246 247 static struct ctl_table kern_table[] = { 248 #ifdef CONFIG_SCHED_DEBUG 249 { 250 .ctl_name = CTL_UNNUMBERED, 251 .procname = "sched_min_granularity_ns", 252 .data = &sysctl_sched_min_granularity, 253 .maxlen = sizeof(unsigned int), 254 .mode = 0644, 255 .proc_handler = &sched_nr_latency_handler, 256 .strategy = &sysctl_intvec, 257 .extra1 = &min_sched_granularity_ns, 258 .extra2 = &max_sched_granularity_ns, 259 }, 260 { 261 .ctl_name = CTL_UNNUMBERED, 262 .procname = "sched_latency_ns", 263 .data = &sysctl_sched_latency, 264 .maxlen = sizeof(unsigned int), 265 .mode = 0644, 266 .proc_handler = &sched_nr_latency_handler, 267 .strategy = &sysctl_intvec, 268 .extra1 = &min_sched_granularity_ns, 269 .extra2 = &max_sched_granularity_ns, 270 }, 271 { 272 .ctl_name = CTL_UNNUMBERED, 273 .procname = "sched_wakeup_granularity_ns", 274 .data = &sysctl_sched_wakeup_granularity, 275 .maxlen = sizeof(unsigned int), 276 .mode = 0644, 277 .proc_handler = &proc_dointvec_minmax, 278 .strategy = &sysctl_intvec, 279 .extra1 = &min_wakeup_granularity_ns, 280 .extra2 = &max_wakeup_granularity_ns, 281 }, 282 { 283 .ctl_name = CTL_UNNUMBERED, 284 .procname = "sched_shares_ratelimit", 285 .data = &sysctl_sched_shares_ratelimit, 286 .maxlen = sizeof(unsigned int), 287 .mode = 0644, 288 .proc_handler = &proc_dointvec, 289 }, 290 { 291 .ctl_name = CTL_UNNUMBERED, 292 .procname = "sched_shares_thresh", 293 .data = &sysctl_sched_shares_thresh, 294 .maxlen = sizeof(unsigned int), 295 .mode = 0644, 296 .proc_handler = &proc_dointvec_minmax, 297 .strategy = &sysctl_intvec, 298 .extra1 = &zero, 299 }, 300 { 301 .ctl_name = CTL_UNNUMBERED, 302 .procname = "sched_child_runs_first", 303 .data = &sysctl_sched_child_runs_first, 304 .maxlen = sizeof(unsigned int), 305 .mode = 0644, 306 .proc_handler = &proc_dointvec, 307 }, 308 { 309 .ctl_name = CTL_UNNUMBERED, 310 .procname = "sched_features", 311 .data = &sysctl_sched_features, 312 .maxlen = sizeof(unsigned int), 313 .mode = 0644, 314 .proc_handler = &proc_dointvec, 315 }, 316 { 317 .ctl_name = CTL_UNNUMBERED, 318 .procname = "sched_migration_cost", 319 .data = &sysctl_sched_migration_cost, 320 .maxlen = sizeof(unsigned int), 321 .mode = 0644, 322 .proc_handler = &proc_dointvec, 323 }, 324 { 325 .ctl_name = CTL_UNNUMBERED, 326 .procname = "sched_nr_migrate", 327 .data = &sysctl_sched_nr_migrate, 328 .maxlen = sizeof(unsigned int), 329 .mode = 0644, 330 .proc_handler = &proc_dointvec, 331 }, 332 { 333 .ctl_name = CTL_UNNUMBERED, 334 .procname = "timer_migration", 335 .data = &sysctl_timer_migration, 336 .maxlen = sizeof(unsigned int), 337 .mode = 0644, 338 .proc_handler = &proc_dointvec_minmax, 339 .strategy = &sysctl_intvec, 340 .extra1 = &zero, 341 .extra2 = &one, 342 }, 343 #endif 344 { 345 .ctl_name = CTL_UNNUMBERED, 346 .procname = "sched_rt_period_us", 347 .data = &sysctl_sched_rt_period, 348 .maxlen = sizeof(unsigned int), 349 .mode = 0644, 350 .proc_handler = &sched_rt_handler, 351 }, 352 { 353 .ctl_name = CTL_UNNUMBERED, 354 .procname = "sched_rt_runtime_us", 355 .data = &sysctl_sched_rt_runtime, 356 .maxlen = sizeof(int), 357 .mode = 0644, 358 .proc_handler = &sched_rt_handler, 359 }, 360 { 361 .ctl_name = CTL_UNNUMBERED, 362 .procname = "sched_compat_yield", 363 .data = &sysctl_sched_compat_yield, 364 .maxlen = sizeof(unsigned int), 365 .mode = 0644, 366 .proc_handler = &proc_dointvec, 367 }, 368 #ifdef CONFIG_PROVE_LOCKING 369 { 370 .ctl_name = CTL_UNNUMBERED, 371 .procname = "prove_locking", 372 .data = &prove_locking, 373 .maxlen = sizeof(int), 374 .mode = 0644, 375 .proc_handler = &proc_dointvec, 376 }, 377 #endif 378 #ifdef CONFIG_LOCK_STAT 379 { 380 .ctl_name = CTL_UNNUMBERED, 381 .procname = "lock_stat", 382 .data = &lock_stat, 383 .maxlen = sizeof(int), 384 .mode = 0644, 385 .proc_handler = &proc_dointvec, 386 }, 387 #endif 388 { 389 .ctl_name = KERN_PANIC, 390 .procname = "panic", 391 .data = &panic_timeout, 392 .maxlen = sizeof(int), 393 .mode = 0644, 394 .proc_handler = &proc_dointvec, 395 }, 396 { 397 .ctl_name = KERN_CORE_USES_PID, 398 .procname = "core_uses_pid", 399 .data = &core_uses_pid, 400 .maxlen = sizeof(int), 401 .mode = 0644, 402 .proc_handler = &proc_dointvec, 403 }, 404 { 405 .ctl_name = KERN_CORE_PATTERN, 406 .procname = "core_pattern", 407 .data = core_pattern, 408 .maxlen = CORENAME_MAX_SIZE, 409 .mode = 0644, 410 .proc_handler = &proc_dostring, 411 .strategy = &sysctl_string, 412 }, 413 #ifdef CONFIG_PROC_SYSCTL 414 { 415 .procname = "tainted", 416 .maxlen = sizeof(long), 417 .mode = 0644, 418 .proc_handler = &proc_taint, 419 }, 420 #endif 421 #ifdef CONFIG_LATENCYTOP 422 { 423 .procname = "latencytop", 424 .data = &latencytop_enabled, 425 .maxlen = sizeof(int), 426 .mode = 0644, 427 .proc_handler = &proc_dointvec, 428 }, 429 #endif 430 #ifdef CONFIG_BLK_DEV_INITRD 431 { 432 .ctl_name = KERN_REALROOTDEV, 433 .procname = "real-root-dev", 434 .data = &real_root_dev, 435 .maxlen = sizeof(int), 436 .mode = 0644, 437 .proc_handler = &proc_dointvec, 438 }, 439 #endif 440 { 441 .ctl_name = CTL_UNNUMBERED, 442 .procname = "print-fatal-signals", 443 .data = &print_fatal_signals, 444 .maxlen = sizeof(int), 445 .mode = 0644, 446 .proc_handler = &proc_dointvec, 447 }, 448 #ifdef CONFIG_SPARC 449 { 450 .ctl_name = KERN_SPARC_REBOOT, 451 .procname = "reboot-cmd", 452 .data = reboot_command, 453 .maxlen = 256, 454 .mode = 0644, 455 .proc_handler = &proc_dostring, 456 .strategy = &sysctl_string, 457 }, 458 { 459 .ctl_name = KERN_SPARC_STOP_A, 460 .procname = "stop-a", 461 .data = &stop_a_enabled, 462 .maxlen = sizeof (int), 463 .mode = 0644, 464 .proc_handler = &proc_dointvec, 465 }, 466 { 467 .ctl_name = KERN_SPARC_SCONS_PWROFF, 468 .procname = "scons-poweroff", 469 .data = &scons_pwroff, 470 .maxlen = sizeof (int), 471 .mode = 0644, 472 .proc_handler = &proc_dointvec, 473 }, 474 #endif 475 #ifdef CONFIG_SPARC64 476 { 477 .ctl_name = CTL_UNNUMBERED, 478 .procname = "tsb-ratio", 479 .data = &sysctl_tsb_ratio, 480 .maxlen = sizeof (int), 481 .mode = 0644, 482 .proc_handler = &proc_dointvec, 483 }, 484 #endif 485 #ifdef __hppa__ 486 { 487 .ctl_name = KERN_HPPA_PWRSW, 488 .procname = "soft-power", 489 .data = &pwrsw_enabled, 490 .maxlen = sizeof (int), 491 .mode = 0644, 492 .proc_handler = &proc_dointvec, 493 }, 494 { 495 .ctl_name = KERN_HPPA_UNALIGNED, 496 .procname = "unaligned-trap", 497 .data = &unaligned_enabled, 498 .maxlen = sizeof (int), 499 .mode = 0644, 500 .proc_handler = &proc_dointvec, 501 }, 502 #endif 503 { 504 .ctl_name = KERN_CTLALTDEL, 505 .procname = "ctrl-alt-del", 506 .data = &C_A_D, 507 .maxlen = sizeof(int), 508 .mode = 0644, 509 .proc_handler = &proc_dointvec, 510 }, 511 #ifdef CONFIG_FUNCTION_TRACER 512 { 513 .ctl_name = CTL_UNNUMBERED, 514 .procname = "ftrace_enabled", 515 .data = &ftrace_enabled, 516 .maxlen = sizeof(int), 517 .mode = 0644, 518 .proc_handler = &ftrace_enable_sysctl, 519 }, 520 #endif 521 #ifdef CONFIG_STACK_TRACER 522 { 523 .ctl_name = CTL_UNNUMBERED, 524 .procname = "stack_tracer_enabled", 525 .data = &stack_tracer_enabled, 526 .maxlen = sizeof(int), 527 .mode = 0644, 528 .proc_handler = &stack_trace_sysctl, 529 }, 530 #endif 531 #ifdef CONFIG_TRACING 532 { 533 .ctl_name = CTL_UNNUMBERED, 534 .procname = "ftrace_dump_on_oops", 535 .data = &ftrace_dump_on_oops, 536 .maxlen = sizeof(int), 537 .mode = 0644, 538 .proc_handler = &proc_dointvec, 539 }, 540 #endif 541 #ifdef CONFIG_MODULES 542 { 543 .ctl_name = KERN_MODPROBE, 544 .procname = "modprobe", 545 .data = &modprobe_path, 546 .maxlen = KMOD_PATH_LEN, 547 .mode = 0644, 548 .proc_handler = &proc_dostring, 549 .strategy = &sysctl_string, 550 }, 551 { 552 .ctl_name = CTL_UNNUMBERED, 553 .procname = "modules_disabled", 554 .data = &modules_disabled, 555 .maxlen = sizeof(int), 556 .mode = 0644, 557 /* only handle a transition from default "0" to "1" */ 558 .proc_handler = &proc_dointvec_minmax, 559 .extra1 = &one, 560 .extra2 = &one, 561 }, 562 #endif 563 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) 564 { 565 .ctl_name = KERN_HOTPLUG, 566 .procname = "hotplug", 567 .data = &uevent_helper, 568 .maxlen = UEVENT_HELPER_PATH_LEN, 569 .mode = 0644, 570 .proc_handler = &proc_dostring, 571 .strategy = &sysctl_string, 572 }, 573 #endif 574 #ifdef CONFIG_CHR_DEV_SG 575 { 576 .ctl_name = KERN_SG_BIG_BUFF, 577 .procname = "sg-big-buff", 578 .data = &sg_big_buff, 579 .maxlen = sizeof (int), 580 .mode = 0444, 581 .proc_handler = &proc_dointvec, 582 }, 583 #endif 584 #ifdef CONFIG_BSD_PROCESS_ACCT 585 { 586 .ctl_name = KERN_ACCT, 587 .procname = "acct", 588 .data = &acct_parm, 589 .maxlen = 3*sizeof(int), 590 .mode = 0644, 591 .proc_handler = &proc_dointvec, 592 }, 593 #endif 594 #ifdef CONFIG_MAGIC_SYSRQ 595 { 596 .ctl_name = KERN_SYSRQ, 597 .procname = "sysrq", 598 .data = &__sysrq_enabled, 599 .maxlen = sizeof (int), 600 .mode = 0644, 601 .proc_handler = &proc_dointvec, 602 }, 603 #endif 604 #ifdef CONFIG_PROC_SYSCTL 605 { 606 .procname = "cad_pid", 607 .data = NULL, 608 .maxlen = sizeof (int), 609 .mode = 0600, 610 .proc_handler = &proc_do_cad_pid, 611 }, 612 #endif 613 { 614 .ctl_name = KERN_MAX_THREADS, 615 .procname = "threads-max", 616 .data = &max_threads, 617 .maxlen = sizeof(int), 618 .mode = 0644, 619 .proc_handler = &proc_dointvec, 620 }, 621 { 622 .ctl_name = KERN_RANDOM, 623 .procname = "random", 624 .mode = 0555, 625 .child = random_table, 626 }, 627 { 628 .ctl_name = KERN_OVERFLOWUID, 629 .procname = "overflowuid", 630 .data = &overflowuid, 631 .maxlen = sizeof(int), 632 .mode = 0644, 633 .proc_handler = &proc_dointvec_minmax, 634 .strategy = &sysctl_intvec, 635 .extra1 = &minolduid, 636 .extra2 = &maxolduid, 637 }, 638 { 639 .ctl_name = KERN_OVERFLOWGID, 640 .procname = "overflowgid", 641 .data = &overflowgid, 642 .maxlen = sizeof(int), 643 .mode = 0644, 644 .proc_handler = &proc_dointvec_minmax, 645 .strategy = &sysctl_intvec, 646 .extra1 = &minolduid, 647 .extra2 = &maxolduid, 648 }, 649 #ifdef CONFIG_S390 650 #ifdef CONFIG_MATHEMU 651 { 652 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 653 .procname = "ieee_emulation_warnings", 654 .data = &sysctl_ieee_emulation_warnings, 655 .maxlen = sizeof(int), 656 .mode = 0644, 657 .proc_handler = &proc_dointvec, 658 }, 659 #endif 660 { 661 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 662 .procname = "userprocess_debug", 663 .data = &sysctl_userprocess_debug, 664 .maxlen = sizeof(int), 665 .mode = 0644, 666 .proc_handler = &proc_dointvec, 667 }, 668 #endif 669 { 670 .ctl_name = KERN_PIDMAX, 671 .procname = "pid_max", 672 .data = &pid_max, 673 .maxlen = sizeof (int), 674 .mode = 0644, 675 .proc_handler = &proc_dointvec_minmax, 676 .strategy = sysctl_intvec, 677 .extra1 = &pid_max_min, 678 .extra2 = &pid_max_max, 679 }, 680 { 681 .ctl_name = KERN_PANIC_ON_OOPS, 682 .procname = "panic_on_oops", 683 .data = &panic_on_oops, 684 .maxlen = sizeof(int), 685 .mode = 0644, 686 .proc_handler = &proc_dointvec, 687 }, 688 #if defined CONFIG_PRINTK 689 { 690 .ctl_name = KERN_PRINTK, 691 .procname = "printk", 692 .data = &console_loglevel, 693 .maxlen = 4*sizeof(int), 694 .mode = 0644, 695 .proc_handler = &proc_dointvec, 696 }, 697 { 698 .ctl_name = KERN_PRINTK_RATELIMIT, 699 .procname = "printk_ratelimit", 700 .data = &printk_ratelimit_state.interval, 701 .maxlen = sizeof(int), 702 .mode = 0644, 703 .proc_handler = &proc_dointvec_jiffies, 704 .strategy = &sysctl_jiffies, 705 }, 706 { 707 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 708 .procname = "printk_ratelimit_burst", 709 .data = &printk_ratelimit_state.burst, 710 .maxlen = sizeof(int), 711 .mode = 0644, 712 .proc_handler = &proc_dointvec, 713 }, 714 #endif 715 { 716 .ctl_name = KERN_NGROUPS_MAX, 717 .procname = "ngroups_max", 718 .data = &ngroups_max, 719 .maxlen = sizeof (int), 720 .mode = 0444, 721 .proc_handler = &proc_dointvec, 722 }, 723 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 724 { 725 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 726 .procname = "unknown_nmi_panic", 727 .data = &unknown_nmi_panic, 728 .maxlen = sizeof (int), 729 .mode = 0644, 730 .proc_handler = &proc_dointvec, 731 }, 732 { 733 .procname = "nmi_watchdog", 734 .data = &nmi_watchdog_enabled, 735 .maxlen = sizeof (int), 736 .mode = 0644, 737 .proc_handler = &proc_nmi_enabled, 738 }, 739 #endif 740 #if defined(CONFIG_X86) 741 { 742 .ctl_name = KERN_PANIC_ON_NMI, 743 .procname = "panic_on_unrecovered_nmi", 744 .data = &panic_on_unrecovered_nmi, 745 .maxlen = sizeof(int), 746 .mode = 0644, 747 .proc_handler = &proc_dointvec, 748 }, 749 { 750 .ctl_name = CTL_UNNUMBERED, 751 .procname = "panic_on_io_nmi", 752 .data = &panic_on_io_nmi, 753 .maxlen = sizeof(int), 754 .mode = 0644, 755 .proc_handler = &proc_dointvec, 756 }, 757 { 758 .ctl_name = KERN_BOOTLOADER_TYPE, 759 .procname = "bootloader_type", 760 .data = &bootloader_type, 761 .maxlen = sizeof (int), 762 .mode = 0444, 763 .proc_handler = &proc_dointvec, 764 }, 765 { 766 .ctl_name = CTL_UNNUMBERED, 767 .procname = "bootloader_version", 768 .data = &bootloader_version, 769 .maxlen = sizeof (int), 770 .mode = 0444, 771 .proc_handler = &proc_dointvec, 772 }, 773 { 774 .ctl_name = CTL_UNNUMBERED, 775 .procname = "kstack_depth_to_print", 776 .data = &kstack_depth_to_print, 777 .maxlen = sizeof(int), 778 .mode = 0644, 779 .proc_handler = &proc_dointvec, 780 }, 781 { 782 .ctl_name = CTL_UNNUMBERED, 783 .procname = "io_delay_type", 784 .data = &io_delay_type, 785 .maxlen = sizeof(int), 786 .mode = 0644, 787 .proc_handler = &proc_dointvec, 788 }, 789 #endif 790 #if defined(CONFIG_MMU) 791 { 792 .ctl_name = KERN_RANDOMIZE, 793 .procname = "randomize_va_space", 794 .data = &randomize_va_space, 795 .maxlen = sizeof(int), 796 .mode = 0644, 797 .proc_handler = &proc_dointvec, 798 }, 799 #endif 800 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 801 { 802 .ctl_name = KERN_SPIN_RETRY, 803 .procname = "spin_retry", 804 .data = &spin_retry, 805 .maxlen = sizeof (int), 806 .mode = 0644, 807 .proc_handler = &proc_dointvec, 808 }, 809 #endif 810 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 811 { 812 .procname = "acpi_video_flags", 813 .data = &acpi_realmode_flags, 814 .maxlen = sizeof (unsigned long), 815 .mode = 0644, 816 .proc_handler = &proc_doulongvec_minmax, 817 }, 818 #endif 819 #ifdef CONFIG_IA64 820 { 821 .ctl_name = KERN_IA64_UNALIGNED, 822 .procname = "ignore-unaligned-usertrap", 823 .data = &no_unaligned_warning, 824 .maxlen = sizeof (int), 825 .mode = 0644, 826 .proc_handler = &proc_dointvec, 827 }, 828 { 829 .ctl_name = CTL_UNNUMBERED, 830 .procname = "unaligned-dump-stack", 831 .data = &unaligned_dump_stack, 832 .maxlen = sizeof (int), 833 .mode = 0644, 834 .proc_handler = &proc_dointvec, 835 }, 836 #endif 837 #ifdef CONFIG_DETECT_SOFTLOCKUP 838 { 839 .ctl_name = CTL_UNNUMBERED, 840 .procname = "softlockup_panic", 841 .data = &softlockup_panic, 842 .maxlen = sizeof(int), 843 .mode = 0644, 844 .proc_handler = &proc_dointvec_minmax, 845 .strategy = &sysctl_intvec, 846 .extra1 = &zero, 847 .extra2 = &one, 848 }, 849 { 850 .ctl_name = CTL_UNNUMBERED, 851 .procname = "softlockup_thresh", 852 .data = &softlockup_thresh, 853 .maxlen = sizeof(int), 854 .mode = 0644, 855 .proc_handler = &proc_dosoftlockup_thresh, 856 .strategy = &sysctl_intvec, 857 .extra1 = &neg_one, 858 .extra2 = &sixty, 859 }, 860 #endif 861 #ifdef CONFIG_DETECT_HUNG_TASK 862 { 863 .ctl_name = CTL_UNNUMBERED, 864 .procname = "hung_task_panic", 865 .data = &sysctl_hung_task_panic, 866 .maxlen = sizeof(int), 867 .mode = 0644, 868 .proc_handler = &proc_dointvec_minmax, 869 .strategy = &sysctl_intvec, 870 .extra1 = &zero, 871 .extra2 = &one, 872 }, 873 { 874 .ctl_name = CTL_UNNUMBERED, 875 .procname = "hung_task_check_count", 876 .data = &sysctl_hung_task_check_count, 877 .maxlen = sizeof(unsigned long), 878 .mode = 0644, 879 .proc_handler = &proc_doulongvec_minmax, 880 .strategy = &sysctl_intvec, 881 }, 882 { 883 .ctl_name = CTL_UNNUMBERED, 884 .procname = "hung_task_timeout_secs", 885 .data = &sysctl_hung_task_timeout_secs, 886 .maxlen = sizeof(unsigned long), 887 .mode = 0644, 888 .proc_handler = &proc_dohung_task_timeout_secs, 889 .strategy = &sysctl_intvec, 890 }, 891 { 892 .ctl_name = CTL_UNNUMBERED, 893 .procname = "hung_task_warnings", 894 .data = &sysctl_hung_task_warnings, 895 .maxlen = sizeof(unsigned long), 896 .mode = 0644, 897 .proc_handler = &proc_doulongvec_minmax, 898 .strategy = &sysctl_intvec, 899 }, 900 #endif 901 #ifdef CONFIG_COMPAT 902 { 903 .ctl_name = KERN_COMPAT_LOG, 904 .procname = "compat-log", 905 .data = &compat_log, 906 .maxlen = sizeof (int), 907 .mode = 0644, 908 .proc_handler = &proc_dointvec, 909 }, 910 #endif 911 #ifdef CONFIG_RT_MUTEXES 912 { 913 .ctl_name = KERN_MAX_LOCK_DEPTH, 914 .procname = "max_lock_depth", 915 .data = &max_lock_depth, 916 .maxlen = sizeof(int), 917 .mode = 0644, 918 .proc_handler = &proc_dointvec, 919 }, 920 #endif 921 { 922 .ctl_name = CTL_UNNUMBERED, 923 .procname = "poweroff_cmd", 924 .data = &poweroff_cmd, 925 .maxlen = POWEROFF_CMD_PATH_LEN, 926 .mode = 0644, 927 .proc_handler = &proc_dostring, 928 .strategy = &sysctl_string, 929 }, 930 #ifdef CONFIG_KEYS 931 { 932 .ctl_name = CTL_UNNUMBERED, 933 .procname = "keys", 934 .mode = 0555, 935 .child = key_sysctls, 936 }, 937 #endif 938 #ifdef CONFIG_RCU_TORTURE_TEST 939 { 940 .ctl_name = CTL_UNNUMBERED, 941 .procname = "rcutorture_runnable", 942 .data = &rcutorture_runnable, 943 .maxlen = sizeof(int), 944 .mode = 0644, 945 .proc_handler = &proc_dointvec, 946 }, 947 #endif 948 #ifdef CONFIG_SLOW_WORK 949 { 950 .ctl_name = CTL_UNNUMBERED, 951 .procname = "slow-work", 952 .mode = 0555, 953 .child = slow_work_sysctls, 954 }, 955 #endif 956 #ifdef CONFIG_PERF_COUNTERS 957 { 958 .ctl_name = CTL_UNNUMBERED, 959 .procname = "perf_counter_paranoid", 960 .data = &sysctl_perf_counter_paranoid, 961 .maxlen = sizeof(sysctl_perf_counter_paranoid), 962 .mode = 0644, 963 .proc_handler = &proc_dointvec, 964 }, 965 { 966 .ctl_name = CTL_UNNUMBERED, 967 .procname = "perf_counter_mlock_kb", 968 .data = &sysctl_perf_counter_mlock, 969 .maxlen = sizeof(sysctl_perf_counter_mlock), 970 .mode = 0644, 971 .proc_handler = &proc_dointvec, 972 }, 973 { 974 .ctl_name = CTL_UNNUMBERED, 975 .procname = "perf_counter_max_sample_rate", 976 .data = &sysctl_perf_counter_sample_rate, 977 .maxlen = sizeof(sysctl_perf_counter_sample_rate), 978 .mode = 0644, 979 .proc_handler = &proc_dointvec, 980 }, 981 #endif 982 #ifdef CONFIG_KMEMCHECK 983 { 984 .ctl_name = CTL_UNNUMBERED, 985 .procname = "kmemcheck", 986 .data = &kmemcheck_enabled, 987 .maxlen = sizeof(int), 988 .mode = 0644, 989 .proc_handler = &proc_dointvec, 990 }, 991 #endif 992 993 /* 994 * NOTE: do not add new entries to this table unless you have read 995 * Documentation/sysctl/ctl_unnumbered.txt 996 */ 997 { .ctl_name = 0 } 998 }; 999 1000 static struct ctl_table vm_table[] = { 1001 { 1002 .ctl_name = VM_OVERCOMMIT_MEMORY, 1003 .procname = "overcommit_memory", 1004 .data = &sysctl_overcommit_memory, 1005 .maxlen = sizeof(sysctl_overcommit_memory), 1006 .mode = 0644, 1007 .proc_handler = &proc_dointvec, 1008 }, 1009 { 1010 .ctl_name = VM_PANIC_ON_OOM, 1011 .procname = "panic_on_oom", 1012 .data = &sysctl_panic_on_oom, 1013 .maxlen = sizeof(sysctl_panic_on_oom), 1014 .mode = 0644, 1015 .proc_handler = &proc_dointvec, 1016 }, 1017 { 1018 .ctl_name = CTL_UNNUMBERED, 1019 .procname = "oom_kill_allocating_task", 1020 .data = &sysctl_oom_kill_allocating_task, 1021 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1022 .mode = 0644, 1023 .proc_handler = &proc_dointvec, 1024 }, 1025 { 1026 .ctl_name = CTL_UNNUMBERED, 1027 .procname = "oom_dump_tasks", 1028 .data = &sysctl_oom_dump_tasks, 1029 .maxlen = sizeof(sysctl_oom_dump_tasks), 1030 .mode = 0644, 1031 .proc_handler = &proc_dointvec, 1032 }, 1033 { 1034 .ctl_name = VM_OVERCOMMIT_RATIO, 1035 .procname = "overcommit_ratio", 1036 .data = &sysctl_overcommit_ratio, 1037 .maxlen = sizeof(sysctl_overcommit_ratio), 1038 .mode = 0644, 1039 .proc_handler = &proc_dointvec, 1040 }, 1041 { 1042 .ctl_name = VM_PAGE_CLUSTER, 1043 .procname = "page-cluster", 1044 .data = &page_cluster, 1045 .maxlen = sizeof(int), 1046 .mode = 0644, 1047 .proc_handler = &proc_dointvec, 1048 }, 1049 { 1050 .ctl_name = VM_DIRTY_BACKGROUND, 1051 .procname = "dirty_background_ratio", 1052 .data = &dirty_background_ratio, 1053 .maxlen = sizeof(dirty_background_ratio), 1054 .mode = 0644, 1055 .proc_handler = &dirty_background_ratio_handler, 1056 .strategy = &sysctl_intvec, 1057 .extra1 = &zero, 1058 .extra2 = &one_hundred, 1059 }, 1060 { 1061 .ctl_name = CTL_UNNUMBERED, 1062 .procname = "dirty_background_bytes", 1063 .data = &dirty_background_bytes, 1064 .maxlen = sizeof(dirty_background_bytes), 1065 .mode = 0644, 1066 .proc_handler = &dirty_background_bytes_handler, 1067 .strategy = &sysctl_intvec, 1068 .extra1 = &one_ul, 1069 }, 1070 { 1071 .ctl_name = VM_DIRTY_RATIO, 1072 .procname = "dirty_ratio", 1073 .data = &vm_dirty_ratio, 1074 .maxlen = sizeof(vm_dirty_ratio), 1075 .mode = 0644, 1076 .proc_handler = &dirty_ratio_handler, 1077 .strategy = &sysctl_intvec, 1078 .extra1 = &zero, 1079 .extra2 = &one_hundred, 1080 }, 1081 { 1082 .ctl_name = CTL_UNNUMBERED, 1083 .procname = "dirty_bytes", 1084 .data = &vm_dirty_bytes, 1085 .maxlen = sizeof(vm_dirty_bytes), 1086 .mode = 0644, 1087 .proc_handler = &dirty_bytes_handler, 1088 .strategy = &sysctl_intvec, 1089 .extra1 = &dirty_bytes_min, 1090 }, 1091 { 1092 .procname = "dirty_writeback_centisecs", 1093 .data = &dirty_writeback_interval, 1094 .maxlen = sizeof(dirty_writeback_interval), 1095 .mode = 0644, 1096 .proc_handler = &dirty_writeback_centisecs_handler, 1097 }, 1098 { 1099 .procname = "dirty_expire_centisecs", 1100 .data = &dirty_expire_interval, 1101 .maxlen = sizeof(dirty_expire_interval), 1102 .mode = 0644, 1103 .proc_handler = &proc_dointvec, 1104 }, 1105 { 1106 .ctl_name = VM_NR_PDFLUSH_THREADS, 1107 .procname = "nr_pdflush_threads", 1108 .data = &nr_pdflush_threads, 1109 .maxlen = sizeof nr_pdflush_threads, 1110 .mode = 0444 /* read-only*/, 1111 .proc_handler = &proc_dointvec, 1112 }, 1113 { 1114 .ctl_name = VM_SWAPPINESS, 1115 .procname = "swappiness", 1116 .data = &vm_swappiness, 1117 .maxlen = sizeof(vm_swappiness), 1118 .mode = 0644, 1119 .proc_handler = &proc_dointvec_minmax, 1120 .strategy = &sysctl_intvec, 1121 .extra1 = &zero, 1122 .extra2 = &one_hundred, 1123 }, 1124 #ifdef CONFIG_HUGETLB_PAGE 1125 { 1126 .procname = "nr_hugepages", 1127 .data = NULL, 1128 .maxlen = sizeof(unsigned long), 1129 .mode = 0644, 1130 .proc_handler = &hugetlb_sysctl_handler, 1131 .extra1 = (void *)&hugetlb_zero, 1132 .extra2 = (void *)&hugetlb_infinity, 1133 }, 1134 { 1135 .ctl_name = VM_HUGETLB_GROUP, 1136 .procname = "hugetlb_shm_group", 1137 .data = &sysctl_hugetlb_shm_group, 1138 .maxlen = sizeof(gid_t), 1139 .mode = 0644, 1140 .proc_handler = &proc_dointvec, 1141 }, 1142 { 1143 .ctl_name = CTL_UNNUMBERED, 1144 .procname = "hugepages_treat_as_movable", 1145 .data = &hugepages_treat_as_movable, 1146 .maxlen = sizeof(int), 1147 .mode = 0644, 1148 .proc_handler = &hugetlb_treat_movable_handler, 1149 }, 1150 { 1151 .ctl_name = CTL_UNNUMBERED, 1152 .procname = "nr_overcommit_hugepages", 1153 .data = NULL, 1154 .maxlen = sizeof(unsigned long), 1155 .mode = 0644, 1156 .proc_handler = &hugetlb_overcommit_handler, 1157 .extra1 = (void *)&hugetlb_zero, 1158 .extra2 = (void *)&hugetlb_infinity, 1159 }, 1160 #endif 1161 { 1162 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 1163 .procname = "lowmem_reserve_ratio", 1164 .data = &sysctl_lowmem_reserve_ratio, 1165 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1166 .mode = 0644, 1167 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 1168 .strategy = &sysctl_intvec, 1169 }, 1170 { 1171 .ctl_name = VM_DROP_PAGECACHE, 1172 .procname = "drop_caches", 1173 .data = &sysctl_drop_caches, 1174 .maxlen = sizeof(int), 1175 .mode = 0644, 1176 .proc_handler = drop_caches_sysctl_handler, 1177 .strategy = &sysctl_intvec, 1178 }, 1179 { 1180 .ctl_name = VM_MIN_FREE_KBYTES, 1181 .procname = "min_free_kbytes", 1182 .data = &min_free_kbytes, 1183 .maxlen = sizeof(min_free_kbytes), 1184 .mode = 0644, 1185 .proc_handler = &min_free_kbytes_sysctl_handler, 1186 .strategy = &sysctl_intvec, 1187 .extra1 = &zero, 1188 }, 1189 { 1190 .ctl_name = VM_PERCPU_PAGELIST_FRACTION, 1191 .procname = "percpu_pagelist_fraction", 1192 .data = &percpu_pagelist_fraction, 1193 .maxlen = sizeof(percpu_pagelist_fraction), 1194 .mode = 0644, 1195 .proc_handler = &percpu_pagelist_fraction_sysctl_handler, 1196 .strategy = &sysctl_intvec, 1197 .extra1 = &min_percpu_pagelist_fract, 1198 }, 1199 #ifdef CONFIG_MMU 1200 { 1201 .ctl_name = VM_MAX_MAP_COUNT, 1202 .procname = "max_map_count", 1203 .data = &sysctl_max_map_count, 1204 .maxlen = sizeof(sysctl_max_map_count), 1205 .mode = 0644, 1206 .proc_handler = &proc_dointvec 1207 }, 1208 #else 1209 { 1210 .ctl_name = CTL_UNNUMBERED, 1211 .procname = "nr_trim_pages", 1212 .data = &sysctl_nr_trim_pages, 1213 .maxlen = sizeof(sysctl_nr_trim_pages), 1214 .mode = 0644, 1215 .proc_handler = &proc_dointvec_minmax, 1216 .strategy = &sysctl_intvec, 1217 .extra1 = &zero, 1218 }, 1219 #endif 1220 { 1221 .ctl_name = VM_LAPTOP_MODE, 1222 .procname = "laptop_mode", 1223 .data = &laptop_mode, 1224 .maxlen = sizeof(laptop_mode), 1225 .mode = 0644, 1226 .proc_handler = &proc_dointvec_jiffies, 1227 .strategy = &sysctl_jiffies, 1228 }, 1229 { 1230 .ctl_name = VM_BLOCK_DUMP, 1231 .procname = "block_dump", 1232 .data = &block_dump, 1233 .maxlen = sizeof(block_dump), 1234 .mode = 0644, 1235 .proc_handler = &proc_dointvec, 1236 .strategy = &sysctl_intvec, 1237 .extra1 = &zero, 1238 }, 1239 { 1240 .ctl_name = VM_VFS_CACHE_PRESSURE, 1241 .procname = "vfs_cache_pressure", 1242 .data = &sysctl_vfs_cache_pressure, 1243 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1244 .mode = 0644, 1245 .proc_handler = &proc_dointvec, 1246 .strategy = &sysctl_intvec, 1247 .extra1 = &zero, 1248 }, 1249 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1250 { 1251 .ctl_name = VM_LEGACY_VA_LAYOUT, 1252 .procname = "legacy_va_layout", 1253 .data = &sysctl_legacy_va_layout, 1254 .maxlen = sizeof(sysctl_legacy_va_layout), 1255 .mode = 0644, 1256 .proc_handler = &proc_dointvec, 1257 .strategy = &sysctl_intvec, 1258 .extra1 = &zero, 1259 }, 1260 #endif 1261 #ifdef CONFIG_NUMA 1262 { 1263 .ctl_name = VM_ZONE_RECLAIM_MODE, 1264 .procname = "zone_reclaim_mode", 1265 .data = &zone_reclaim_mode, 1266 .maxlen = sizeof(zone_reclaim_mode), 1267 .mode = 0644, 1268 .proc_handler = &proc_dointvec, 1269 .strategy = &sysctl_intvec, 1270 .extra1 = &zero, 1271 }, 1272 { 1273 .ctl_name = VM_MIN_UNMAPPED, 1274 .procname = "min_unmapped_ratio", 1275 .data = &sysctl_min_unmapped_ratio, 1276 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1277 .mode = 0644, 1278 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, 1279 .strategy = &sysctl_intvec, 1280 .extra1 = &zero, 1281 .extra2 = &one_hundred, 1282 }, 1283 { 1284 .ctl_name = VM_MIN_SLAB, 1285 .procname = "min_slab_ratio", 1286 .data = &sysctl_min_slab_ratio, 1287 .maxlen = sizeof(sysctl_min_slab_ratio), 1288 .mode = 0644, 1289 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, 1290 .strategy = &sysctl_intvec, 1291 .extra1 = &zero, 1292 .extra2 = &one_hundred, 1293 }, 1294 #endif 1295 #ifdef CONFIG_SMP 1296 { 1297 .ctl_name = CTL_UNNUMBERED, 1298 .procname = "stat_interval", 1299 .data = &sysctl_stat_interval, 1300 .maxlen = sizeof(sysctl_stat_interval), 1301 .mode = 0644, 1302 .proc_handler = &proc_dointvec_jiffies, 1303 .strategy = &sysctl_jiffies, 1304 }, 1305 #endif 1306 { 1307 .ctl_name = CTL_UNNUMBERED, 1308 .procname = "mmap_min_addr", 1309 .data = &mmap_min_addr, 1310 .maxlen = sizeof(unsigned long), 1311 .mode = 0644, 1312 .proc_handler = &proc_doulongvec_minmax, 1313 }, 1314 #ifdef CONFIG_NUMA 1315 { 1316 .ctl_name = CTL_UNNUMBERED, 1317 .procname = "numa_zonelist_order", 1318 .data = &numa_zonelist_order, 1319 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1320 .mode = 0644, 1321 .proc_handler = &numa_zonelist_order_handler, 1322 .strategy = &sysctl_string, 1323 }, 1324 #endif 1325 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1326 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1327 { 1328 .ctl_name = VM_VDSO_ENABLED, 1329 .procname = "vdso_enabled", 1330 .data = &vdso_enabled, 1331 .maxlen = sizeof(vdso_enabled), 1332 .mode = 0644, 1333 .proc_handler = &proc_dointvec, 1334 .strategy = &sysctl_intvec, 1335 .extra1 = &zero, 1336 }, 1337 #endif 1338 #ifdef CONFIG_HIGHMEM 1339 { 1340 .ctl_name = CTL_UNNUMBERED, 1341 .procname = "highmem_is_dirtyable", 1342 .data = &vm_highmem_is_dirtyable, 1343 .maxlen = sizeof(vm_highmem_is_dirtyable), 1344 .mode = 0644, 1345 .proc_handler = &proc_dointvec_minmax, 1346 .strategy = &sysctl_intvec, 1347 .extra1 = &zero, 1348 .extra2 = &one, 1349 }, 1350 #endif 1351 { 1352 .ctl_name = CTL_UNNUMBERED, 1353 .procname = "scan_unevictable_pages", 1354 .data = &scan_unevictable_pages, 1355 .maxlen = sizeof(scan_unevictable_pages), 1356 .mode = 0644, 1357 .proc_handler = &scan_unevictable_handler, 1358 }, 1359 /* 1360 * NOTE: do not add new entries to this table unless you have read 1361 * Documentation/sysctl/ctl_unnumbered.txt 1362 */ 1363 { .ctl_name = 0 } 1364 }; 1365 1366 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1367 static struct ctl_table binfmt_misc_table[] = { 1368 { .ctl_name = 0 } 1369 }; 1370 #endif 1371 1372 static struct ctl_table fs_table[] = { 1373 { 1374 .ctl_name = FS_NRINODE, 1375 .procname = "inode-nr", 1376 .data = &inodes_stat, 1377 .maxlen = 2*sizeof(int), 1378 .mode = 0444, 1379 .proc_handler = &proc_dointvec, 1380 }, 1381 { 1382 .ctl_name = FS_STATINODE, 1383 .procname = "inode-state", 1384 .data = &inodes_stat, 1385 .maxlen = 7*sizeof(int), 1386 .mode = 0444, 1387 .proc_handler = &proc_dointvec, 1388 }, 1389 { 1390 .procname = "file-nr", 1391 .data = &files_stat, 1392 .maxlen = 3*sizeof(int), 1393 .mode = 0444, 1394 .proc_handler = &proc_nr_files, 1395 }, 1396 { 1397 .ctl_name = FS_MAXFILE, 1398 .procname = "file-max", 1399 .data = &files_stat.max_files, 1400 .maxlen = sizeof(int), 1401 .mode = 0644, 1402 .proc_handler = &proc_dointvec, 1403 }, 1404 { 1405 .ctl_name = CTL_UNNUMBERED, 1406 .procname = "nr_open", 1407 .data = &sysctl_nr_open, 1408 .maxlen = sizeof(int), 1409 .mode = 0644, 1410 .proc_handler = &proc_dointvec_minmax, 1411 .extra1 = &sysctl_nr_open_min, 1412 .extra2 = &sysctl_nr_open_max, 1413 }, 1414 { 1415 .ctl_name = FS_DENTRY, 1416 .procname = "dentry-state", 1417 .data = &dentry_stat, 1418 .maxlen = 6*sizeof(int), 1419 .mode = 0444, 1420 .proc_handler = &proc_dointvec, 1421 }, 1422 { 1423 .ctl_name = FS_OVERFLOWUID, 1424 .procname = "overflowuid", 1425 .data = &fs_overflowuid, 1426 .maxlen = sizeof(int), 1427 .mode = 0644, 1428 .proc_handler = &proc_dointvec_minmax, 1429 .strategy = &sysctl_intvec, 1430 .extra1 = &minolduid, 1431 .extra2 = &maxolduid, 1432 }, 1433 { 1434 .ctl_name = FS_OVERFLOWGID, 1435 .procname = "overflowgid", 1436 .data = &fs_overflowgid, 1437 .maxlen = sizeof(int), 1438 .mode = 0644, 1439 .proc_handler = &proc_dointvec_minmax, 1440 .strategy = &sysctl_intvec, 1441 .extra1 = &minolduid, 1442 .extra2 = &maxolduid, 1443 }, 1444 #ifdef CONFIG_FILE_LOCKING 1445 { 1446 .ctl_name = FS_LEASES, 1447 .procname = "leases-enable", 1448 .data = &leases_enable, 1449 .maxlen = sizeof(int), 1450 .mode = 0644, 1451 .proc_handler = &proc_dointvec, 1452 }, 1453 #endif 1454 #ifdef CONFIG_DNOTIFY 1455 { 1456 .ctl_name = FS_DIR_NOTIFY, 1457 .procname = "dir-notify-enable", 1458 .data = &dir_notify_enable, 1459 .maxlen = sizeof(int), 1460 .mode = 0644, 1461 .proc_handler = &proc_dointvec, 1462 }, 1463 #endif 1464 #ifdef CONFIG_MMU 1465 #ifdef CONFIG_FILE_LOCKING 1466 { 1467 .ctl_name = FS_LEASE_TIME, 1468 .procname = "lease-break-time", 1469 .data = &lease_break_time, 1470 .maxlen = sizeof(int), 1471 .mode = 0644, 1472 .proc_handler = &proc_dointvec, 1473 }, 1474 #endif 1475 #ifdef CONFIG_AIO 1476 { 1477 .procname = "aio-nr", 1478 .data = &aio_nr, 1479 .maxlen = sizeof(aio_nr), 1480 .mode = 0444, 1481 .proc_handler = &proc_doulongvec_minmax, 1482 }, 1483 { 1484 .procname = "aio-max-nr", 1485 .data = &aio_max_nr, 1486 .maxlen = sizeof(aio_max_nr), 1487 .mode = 0644, 1488 .proc_handler = &proc_doulongvec_minmax, 1489 }, 1490 #endif /* CONFIG_AIO */ 1491 #ifdef CONFIG_INOTIFY_USER 1492 { 1493 .ctl_name = FS_INOTIFY, 1494 .procname = "inotify", 1495 .mode = 0555, 1496 .child = inotify_table, 1497 }, 1498 #endif 1499 #ifdef CONFIG_EPOLL 1500 { 1501 .procname = "epoll", 1502 .mode = 0555, 1503 .child = epoll_table, 1504 }, 1505 #endif 1506 #endif 1507 { 1508 .ctl_name = KERN_SETUID_DUMPABLE, 1509 .procname = "suid_dumpable", 1510 .data = &suid_dumpable, 1511 .maxlen = sizeof(int), 1512 .mode = 0644, 1513 .proc_handler = &proc_dointvec_minmax, 1514 .strategy = &sysctl_intvec, 1515 .extra1 = &zero, 1516 .extra2 = &two, 1517 }, 1518 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1519 { 1520 .ctl_name = CTL_UNNUMBERED, 1521 .procname = "binfmt_misc", 1522 .mode = 0555, 1523 .child = binfmt_misc_table, 1524 }, 1525 #endif 1526 /* 1527 * NOTE: do not add new entries to this table unless you have read 1528 * Documentation/sysctl/ctl_unnumbered.txt 1529 */ 1530 { .ctl_name = 0 } 1531 }; 1532 1533 static struct ctl_table debug_table[] = { 1534 #if defined(CONFIG_X86) || defined(CONFIG_PPC) 1535 { 1536 .ctl_name = CTL_UNNUMBERED, 1537 .procname = "exception-trace", 1538 .data = &show_unhandled_signals, 1539 .maxlen = sizeof(int), 1540 .mode = 0644, 1541 .proc_handler = proc_dointvec 1542 }, 1543 #endif 1544 { .ctl_name = 0 } 1545 }; 1546 1547 static struct ctl_table dev_table[] = { 1548 { .ctl_name = 0 } 1549 }; 1550 1551 static DEFINE_SPINLOCK(sysctl_lock); 1552 1553 /* called under sysctl_lock */ 1554 static int use_table(struct ctl_table_header *p) 1555 { 1556 if (unlikely(p->unregistering)) 1557 return 0; 1558 p->used++; 1559 return 1; 1560 } 1561 1562 /* called under sysctl_lock */ 1563 static void unuse_table(struct ctl_table_header *p) 1564 { 1565 if (!--p->used) 1566 if (unlikely(p->unregistering)) 1567 complete(p->unregistering); 1568 } 1569 1570 /* called under sysctl_lock, will reacquire if has to wait */ 1571 static void start_unregistering(struct ctl_table_header *p) 1572 { 1573 /* 1574 * if p->used is 0, nobody will ever touch that entry again; 1575 * we'll eliminate all paths to it before dropping sysctl_lock 1576 */ 1577 if (unlikely(p->used)) { 1578 struct completion wait; 1579 init_completion(&wait); 1580 p->unregistering = &wait; 1581 spin_unlock(&sysctl_lock); 1582 wait_for_completion(&wait); 1583 spin_lock(&sysctl_lock); 1584 } else { 1585 /* anything non-NULL; we'll never dereference it */ 1586 p->unregistering = ERR_PTR(-EINVAL); 1587 } 1588 /* 1589 * do not remove from the list until nobody holds it; walking the 1590 * list in do_sysctl() relies on that. 1591 */ 1592 list_del_init(&p->ctl_entry); 1593 } 1594 1595 void sysctl_head_get(struct ctl_table_header *head) 1596 { 1597 spin_lock(&sysctl_lock); 1598 head->count++; 1599 spin_unlock(&sysctl_lock); 1600 } 1601 1602 void sysctl_head_put(struct ctl_table_header *head) 1603 { 1604 spin_lock(&sysctl_lock); 1605 if (!--head->count) 1606 kfree(head); 1607 spin_unlock(&sysctl_lock); 1608 } 1609 1610 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1611 { 1612 if (!head) 1613 BUG(); 1614 spin_lock(&sysctl_lock); 1615 if (!use_table(head)) 1616 head = ERR_PTR(-ENOENT); 1617 spin_unlock(&sysctl_lock); 1618 return head; 1619 } 1620 1621 void sysctl_head_finish(struct ctl_table_header *head) 1622 { 1623 if (!head) 1624 return; 1625 spin_lock(&sysctl_lock); 1626 unuse_table(head); 1627 spin_unlock(&sysctl_lock); 1628 } 1629 1630 static struct ctl_table_set * 1631 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1632 { 1633 struct ctl_table_set *set = &root->default_set; 1634 if (root->lookup) 1635 set = root->lookup(root, namespaces); 1636 return set; 1637 } 1638 1639 static struct list_head * 1640 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1641 { 1642 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1643 return &set->list; 1644 } 1645 1646 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1647 struct ctl_table_header *prev) 1648 { 1649 struct ctl_table_root *root; 1650 struct list_head *header_list; 1651 struct ctl_table_header *head; 1652 struct list_head *tmp; 1653 1654 spin_lock(&sysctl_lock); 1655 if (prev) { 1656 head = prev; 1657 tmp = &prev->ctl_entry; 1658 unuse_table(prev); 1659 goto next; 1660 } 1661 tmp = &root_table_header.ctl_entry; 1662 for (;;) { 1663 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1664 1665 if (!use_table(head)) 1666 goto next; 1667 spin_unlock(&sysctl_lock); 1668 return head; 1669 next: 1670 root = head->root; 1671 tmp = tmp->next; 1672 header_list = lookup_header_list(root, namespaces); 1673 if (tmp != header_list) 1674 continue; 1675 1676 do { 1677 root = list_entry(root->root_list.next, 1678 struct ctl_table_root, root_list); 1679 if (root == &sysctl_table_root) 1680 goto out; 1681 header_list = lookup_header_list(root, namespaces); 1682 } while (list_empty(header_list)); 1683 tmp = header_list->next; 1684 } 1685 out: 1686 spin_unlock(&sysctl_lock); 1687 return NULL; 1688 } 1689 1690 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1691 { 1692 return __sysctl_head_next(current->nsproxy, prev); 1693 } 1694 1695 void register_sysctl_root(struct ctl_table_root *root) 1696 { 1697 spin_lock(&sysctl_lock); 1698 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1699 spin_unlock(&sysctl_lock); 1700 } 1701 1702 #ifdef CONFIG_SYSCTL_SYSCALL 1703 /* Perform the actual read/write of a sysctl table entry. */ 1704 static int do_sysctl_strategy(struct ctl_table_root *root, 1705 struct ctl_table *table, 1706 void __user *oldval, size_t __user *oldlenp, 1707 void __user *newval, size_t newlen) 1708 { 1709 int op = 0, rc; 1710 1711 if (oldval) 1712 op |= MAY_READ; 1713 if (newval) 1714 op |= MAY_WRITE; 1715 if (sysctl_perm(root, table, op)) 1716 return -EPERM; 1717 1718 if (table->strategy) { 1719 rc = table->strategy(table, oldval, oldlenp, newval, newlen); 1720 if (rc < 0) 1721 return rc; 1722 if (rc > 0) 1723 return 0; 1724 } 1725 1726 /* If there is no strategy routine, or if the strategy returns 1727 * zero, proceed with automatic r/w */ 1728 if (table->data && table->maxlen) { 1729 rc = sysctl_data(table, oldval, oldlenp, newval, newlen); 1730 if (rc < 0) 1731 return rc; 1732 } 1733 return 0; 1734 } 1735 1736 static int parse_table(int __user *name, int nlen, 1737 void __user *oldval, size_t __user *oldlenp, 1738 void __user *newval, size_t newlen, 1739 struct ctl_table_root *root, 1740 struct ctl_table *table) 1741 { 1742 int n; 1743 repeat: 1744 if (!nlen) 1745 return -ENOTDIR; 1746 if (get_user(n, name)) 1747 return -EFAULT; 1748 for ( ; table->ctl_name || table->procname; table++) { 1749 if (!table->ctl_name) 1750 continue; 1751 if (n == table->ctl_name) { 1752 int error; 1753 if (table->child) { 1754 if (sysctl_perm(root, table, MAY_EXEC)) 1755 return -EPERM; 1756 name++; 1757 nlen--; 1758 table = table->child; 1759 goto repeat; 1760 } 1761 error = do_sysctl_strategy(root, table, 1762 oldval, oldlenp, 1763 newval, newlen); 1764 return error; 1765 } 1766 } 1767 return -ENOTDIR; 1768 } 1769 1770 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1771 void __user *newval, size_t newlen) 1772 { 1773 struct ctl_table_header *head; 1774 int error = -ENOTDIR; 1775 1776 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1777 return -ENOTDIR; 1778 if (oldval) { 1779 int old_len; 1780 if (!oldlenp || get_user(old_len, oldlenp)) 1781 return -EFAULT; 1782 } 1783 1784 for (head = sysctl_head_next(NULL); head; 1785 head = sysctl_head_next(head)) { 1786 error = parse_table(name, nlen, oldval, oldlenp, 1787 newval, newlen, 1788 head->root, head->ctl_table); 1789 if (error != -ENOTDIR) { 1790 sysctl_head_finish(head); 1791 break; 1792 } 1793 } 1794 return error; 1795 } 1796 1797 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args) 1798 { 1799 struct __sysctl_args tmp; 1800 int error; 1801 1802 if (copy_from_user(&tmp, args, sizeof(tmp))) 1803 return -EFAULT; 1804 1805 error = deprecated_sysctl_warning(&tmp); 1806 if (error) 1807 goto out; 1808 1809 lock_kernel(); 1810 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1811 tmp.newval, tmp.newlen); 1812 unlock_kernel(); 1813 out: 1814 return error; 1815 } 1816 #endif /* CONFIG_SYSCTL_SYSCALL */ 1817 1818 /* 1819 * sysctl_perm does NOT grant the superuser all rights automatically, because 1820 * some sysctl variables are readonly even to root. 1821 */ 1822 1823 static int test_perm(int mode, int op) 1824 { 1825 if (!current_euid()) 1826 mode >>= 6; 1827 else if (in_egroup_p(0)) 1828 mode >>= 3; 1829 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1830 return 0; 1831 return -EACCES; 1832 } 1833 1834 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1835 { 1836 int error; 1837 int mode; 1838 1839 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1840 if (error) 1841 return error; 1842 1843 if (root->permissions) 1844 mode = root->permissions(root, current->nsproxy, table); 1845 else 1846 mode = table->mode; 1847 1848 return test_perm(mode, op); 1849 } 1850 1851 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1852 { 1853 for (; table->ctl_name || table->procname; table++) { 1854 table->parent = parent; 1855 if (table->child) 1856 sysctl_set_parent(table, table->child); 1857 } 1858 } 1859 1860 static __init int sysctl_init(void) 1861 { 1862 sysctl_set_parent(NULL, root_table); 1863 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1864 { 1865 int err; 1866 err = sysctl_check_table(current->nsproxy, root_table); 1867 } 1868 #endif 1869 return 0; 1870 } 1871 1872 core_initcall(sysctl_init); 1873 1874 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1875 struct ctl_table *table) 1876 { 1877 struct ctl_table *p; 1878 const char *s = branch->procname; 1879 1880 /* branch should have named subdirectory as its first element */ 1881 if (!s || !branch->child) 1882 return NULL; 1883 1884 /* ... and nothing else */ 1885 if (branch[1].procname || branch[1].ctl_name) 1886 return NULL; 1887 1888 /* table should contain subdirectory with the same name */ 1889 for (p = table; p->procname || p->ctl_name; p++) { 1890 if (!p->child) 1891 continue; 1892 if (p->procname && strcmp(p->procname, s) == 0) 1893 return p; 1894 } 1895 return NULL; 1896 } 1897 1898 /* see if attaching q to p would be an improvement */ 1899 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1900 { 1901 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1902 struct ctl_table *next; 1903 int is_better = 0; 1904 int not_in_parent = !p->attached_by; 1905 1906 while ((next = is_branch_in(by, to)) != NULL) { 1907 if (by == q->attached_by) 1908 is_better = 1; 1909 if (to == p->attached_by) 1910 not_in_parent = 1; 1911 by = by->child; 1912 to = next->child; 1913 } 1914 1915 if (is_better && not_in_parent) { 1916 q->attached_by = by; 1917 q->attached_to = to; 1918 q->parent = p; 1919 } 1920 } 1921 1922 /** 1923 * __register_sysctl_paths - register a sysctl hierarchy 1924 * @root: List of sysctl headers to register on 1925 * @namespaces: Data to compute which lists of sysctl entries are visible 1926 * @path: The path to the directory the sysctl table is in. 1927 * @table: the top-level table structure 1928 * 1929 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1930 * array. A completely 0 filled entry terminates the table. 1931 * 1932 * The members of the &struct ctl_table structure are used as follows: 1933 * 1934 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1935 * must be unique within that level of sysctl 1936 * 1937 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1938 * enter a sysctl file 1939 * 1940 * data - a pointer to data for use by proc_handler 1941 * 1942 * maxlen - the maximum size in bytes of the data 1943 * 1944 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1945 * 1946 * child - a pointer to the child sysctl table if this entry is a directory, or 1947 * %NULL. 1948 * 1949 * proc_handler - the text handler routine (described below) 1950 * 1951 * strategy - the strategy routine (described below) 1952 * 1953 * de - for internal use by the sysctl routines 1954 * 1955 * extra1, extra2 - extra pointers usable by the proc handler routines 1956 * 1957 * Leaf nodes in the sysctl tree will be represented by a single file 1958 * under /proc; non-leaf nodes will be represented by directories. 1959 * 1960 * sysctl(2) can automatically manage read and write requests through 1961 * the sysctl table. The data and maxlen fields of the ctl_table 1962 * struct enable minimal validation of the values being written to be 1963 * performed, and the mode field allows minimal authentication. 1964 * 1965 * More sophisticated management can be enabled by the provision of a 1966 * strategy routine with the table entry. This will be called before 1967 * any automatic read or write of the data is performed. 1968 * 1969 * The strategy routine may return 1970 * 1971 * < 0 - Error occurred (error is passed to user process) 1972 * 1973 * 0 - OK - proceed with automatic read or write. 1974 * 1975 * > 0 - OK - read or write has been done by the strategy routine, so 1976 * return immediately. 1977 * 1978 * There must be a proc_handler routine for any terminal nodes 1979 * mirrored under /proc/sys (non-terminals are handled by a built-in 1980 * directory handler). Several default handlers are available to 1981 * cover common cases - 1982 * 1983 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1984 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1985 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1986 * 1987 * It is the handler's job to read the input buffer from user memory 1988 * and process it. The handler should return 0 on success. 1989 * 1990 * This routine returns %NULL on a failure to register, and a pointer 1991 * to the table header on success. 1992 */ 1993 struct ctl_table_header *__register_sysctl_paths( 1994 struct ctl_table_root *root, 1995 struct nsproxy *namespaces, 1996 const struct ctl_path *path, struct ctl_table *table) 1997 { 1998 struct ctl_table_header *header; 1999 struct ctl_table *new, **prevp; 2000 unsigned int n, npath; 2001 struct ctl_table_set *set; 2002 2003 /* Count the path components */ 2004 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) 2005 ; 2006 2007 /* 2008 * For each path component, allocate a 2-element ctl_table array. 2009 * The first array element will be filled with the sysctl entry 2010 * for this, the second will be the sentinel (ctl_name == 0). 2011 * 2012 * We allocate everything in one go so that we don't have to 2013 * worry about freeing additional memory in unregister_sysctl_table. 2014 */ 2015 header = kzalloc(sizeof(struct ctl_table_header) + 2016 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 2017 if (!header) 2018 return NULL; 2019 2020 new = (struct ctl_table *) (header + 1); 2021 2022 /* Now connect the dots */ 2023 prevp = &header->ctl_table; 2024 for (n = 0; n < npath; ++n, ++path) { 2025 /* Copy the procname */ 2026 new->procname = path->procname; 2027 new->ctl_name = path->ctl_name; 2028 new->mode = 0555; 2029 2030 *prevp = new; 2031 prevp = &new->child; 2032 2033 new += 2; 2034 } 2035 *prevp = table; 2036 header->ctl_table_arg = table; 2037 2038 INIT_LIST_HEAD(&header->ctl_entry); 2039 header->used = 0; 2040 header->unregistering = NULL; 2041 header->root = root; 2042 sysctl_set_parent(NULL, header->ctl_table); 2043 header->count = 1; 2044 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 2045 if (sysctl_check_table(namespaces, header->ctl_table)) { 2046 kfree(header); 2047 return NULL; 2048 } 2049 #endif 2050 spin_lock(&sysctl_lock); 2051 header->set = lookup_header_set(root, namespaces); 2052 header->attached_by = header->ctl_table; 2053 header->attached_to = root_table; 2054 header->parent = &root_table_header; 2055 for (set = header->set; set; set = set->parent) { 2056 struct ctl_table_header *p; 2057 list_for_each_entry(p, &set->list, ctl_entry) { 2058 if (p->unregistering) 2059 continue; 2060 try_attach(p, header); 2061 } 2062 } 2063 header->parent->count++; 2064 list_add_tail(&header->ctl_entry, &header->set->list); 2065 spin_unlock(&sysctl_lock); 2066 2067 return header; 2068 } 2069 2070 /** 2071 * register_sysctl_table_path - register a sysctl table hierarchy 2072 * @path: The path to the directory the sysctl table is in. 2073 * @table: the top-level table structure 2074 * 2075 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 2076 * array. A completely 0 filled entry terminates the table. 2077 * 2078 * See __register_sysctl_paths for more details. 2079 */ 2080 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2081 struct ctl_table *table) 2082 { 2083 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 2084 path, table); 2085 } 2086 2087 /** 2088 * register_sysctl_table - register a sysctl table hierarchy 2089 * @table: the top-level table structure 2090 * 2091 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 2092 * array. A completely 0 filled entry terminates the table. 2093 * 2094 * See register_sysctl_paths for more details. 2095 */ 2096 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 2097 { 2098 static const struct ctl_path null_path[] = { {} }; 2099 2100 return register_sysctl_paths(null_path, table); 2101 } 2102 2103 /** 2104 * unregister_sysctl_table - unregister a sysctl table hierarchy 2105 * @header: the header returned from register_sysctl_table 2106 * 2107 * Unregisters the sysctl table and all children. proc entries may not 2108 * actually be removed until they are no longer used by anyone. 2109 */ 2110 void unregister_sysctl_table(struct ctl_table_header * header) 2111 { 2112 might_sleep(); 2113 2114 if (header == NULL) 2115 return; 2116 2117 spin_lock(&sysctl_lock); 2118 start_unregistering(header); 2119 if (!--header->parent->count) { 2120 WARN_ON(1); 2121 kfree(header->parent); 2122 } 2123 if (!--header->count) 2124 kfree(header); 2125 spin_unlock(&sysctl_lock); 2126 } 2127 2128 int sysctl_is_seen(struct ctl_table_header *p) 2129 { 2130 struct ctl_table_set *set = p->set; 2131 int res; 2132 spin_lock(&sysctl_lock); 2133 if (p->unregistering) 2134 res = 0; 2135 else if (!set->is_seen) 2136 res = 1; 2137 else 2138 res = set->is_seen(set); 2139 spin_unlock(&sysctl_lock); 2140 return res; 2141 } 2142 2143 void setup_sysctl_set(struct ctl_table_set *p, 2144 struct ctl_table_set *parent, 2145 int (*is_seen)(struct ctl_table_set *)) 2146 { 2147 INIT_LIST_HEAD(&p->list); 2148 p->parent = parent ? parent : &sysctl_table_root.default_set; 2149 p->is_seen = is_seen; 2150 } 2151 2152 #else /* !CONFIG_SYSCTL */ 2153 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2154 { 2155 return NULL; 2156 } 2157 2158 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2159 struct ctl_table *table) 2160 { 2161 return NULL; 2162 } 2163 2164 void unregister_sysctl_table(struct ctl_table_header * table) 2165 { 2166 } 2167 2168 void setup_sysctl_set(struct ctl_table_set *p, 2169 struct ctl_table_set *parent, 2170 int (*is_seen)(struct ctl_table_set *)) 2171 { 2172 } 2173 2174 void sysctl_head_put(struct ctl_table_header *head) 2175 { 2176 } 2177 2178 #endif /* CONFIG_SYSCTL */ 2179 2180 /* 2181 * /proc/sys support 2182 */ 2183 2184 #ifdef CONFIG_PROC_SYSCTL 2185 2186 static int _proc_do_string(void* data, int maxlen, int write, 2187 struct file *filp, void __user *buffer, 2188 size_t *lenp, loff_t *ppos) 2189 { 2190 size_t len; 2191 char __user *p; 2192 char c; 2193 2194 if (!data || !maxlen || !*lenp) { 2195 *lenp = 0; 2196 return 0; 2197 } 2198 2199 if (write) { 2200 len = 0; 2201 p = buffer; 2202 while (len < *lenp) { 2203 if (get_user(c, p++)) 2204 return -EFAULT; 2205 if (c == 0 || c == '\n') 2206 break; 2207 len++; 2208 } 2209 if (len >= maxlen) 2210 len = maxlen-1; 2211 if(copy_from_user(data, buffer, len)) 2212 return -EFAULT; 2213 ((char *) data)[len] = 0; 2214 *ppos += *lenp; 2215 } else { 2216 len = strlen(data); 2217 if (len > maxlen) 2218 len = maxlen; 2219 2220 if (*ppos > len) { 2221 *lenp = 0; 2222 return 0; 2223 } 2224 2225 data += *ppos; 2226 len -= *ppos; 2227 2228 if (len > *lenp) 2229 len = *lenp; 2230 if (len) 2231 if(copy_to_user(buffer, data, len)) 2232 return -EFAULT; 2233 if (len < *lenp) { 2234 if(put_user('\n', ((char __user *) buffer) + len)) 2235 return -EFAULT; 2236 len++; 2237 } 2238 *lenp = len; 2239 *ppos += len; 2240 } 2241 return 0; 2242 } 2243 2244 /** 2245 * proc_dostring - read a string sysctl 2246 * @table: the sysctl table 2247 * @write: %TRUE if this is a write to the sysctl file 2248 * @filp: the file structure 2249 * @buffer: the user buffer 2250 * @lenp: the size of the user buffer 2251 * @ppos: file position 2252 * 2253 * Reads/writes a string from/to the user buffer. If the kernel 2254 * buffer provided is not large enough to hold the string, the 2255 * string is truncated. The copied string is %NULL-terminated. 2256 * If the string is being read by the user process, it is copied 2257 * and a newline '\n' is added. It is truncated if the buffer is 2258 * not large enough. 2259 * 2260 * Returns 0 on success. 2261 */ 2262 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2263 void __user *buffer, size_t *lenp, loff_t *ppos) 2264 { 2265 return _proc_do_string(table->data, table->maxlen, write, filp, 2266 buffer, lenp, ppos); 2267 } 2268 2269 2270 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 2271 int *valp, 2272 int write, void *data) 2273 { 2274 if (write) { 2275 *valp = *negp ? -*lvalp : *lvalp; 2276 } else { 2277 int val = *valp; 2278 if (val < 0) { 2279 *negp = -1; 2280 *lvalp = (unsigned long)-val; 2281 } else { 2282 *negp = 0; 2283 *lvalp = (unsigned long)val; 2284 } 2285 } 2286 return 0; 2287 } 2288 2289 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2290 int write, struct file *filp, void __user *buffer, 2291 size_t *lenp, loff_t *ppos, 2292 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2293 int write, void *data), 2294 void *data) 2295 { 2296 #define TMPBUFLEN 21 2297 int *i, vleft, first = 1, neg; 2298 unsigned long lval; 2299 size_t left, len; 2300 2301 char buf[TMPBUFLEN], *p; 2302 char __user *s = buffer; 2303 2304 if (!tbl_data || !table->maxlen || !*lenp || 2305 (*ppos && !write)) { 2306 *lenp = 0; 2307 return 0; 2308 } 2309 2310 i = (int *) tbl_data; 2311 vleft = table->maxlen / sizeof(*i); 2312 left = *lenp; 2313 2314 if (!conv) 2315 conv = do_proc_dointvec_conv; 2316 2317 for (; left && vleft--; i++, first=0) { 2318 if (write) { 2319 while (left) { 2320 char c; 2321 if (get_user(c, s)) 2322 return -EFAULT; 2323 if (!isspace(c)) 2324 break; 2325 left--; 2326 s++; 2327 } 2328 if (!left) 2329 break; 2330 neg = 0; 2331 len = left; 2332 if (len > sizeof(buf) - 1) 2333 len = sizeof(buf) - 1; 2334 if (copy_from_user(buf, s, len)) 2335 return -EFAULT; 2336 buf[len] = 0; 2337 p = buf; 2338 if (*p == '-' && left > 1) { 2339 neg = 1; 2340 p++; 2341 } 2342 if (*p < '0' || *p > '9') 2343 break; 2344 2345 lval = simple_strtoul(p, &p, 0); 2346 2347 len = p-buf; 2348 if ((len < left) && *p && !isspace(*p)) 2349 break; 2350 s += len; 2351 left -= len; 2352 2353 if (conv(&neg, &lval, i, 1, data)) 2354 break; 2355 } else { 2356 p = buf; 2357 if (!first) 2358 *p++ = '\t'; 2359 2360 if (conv(&neg, &lval, i, 0, data)) 2361 break; 2362 2363 sprintf(p, "%s%lu", neg ? "-" : "", lval); 2364 len = strlen(buf); 2365 if (len > left) 2366 len = left; 2367 if(copy_to_user(s, buf, len)) 2368 return -EFAULT; 2369 left -= len; 2370 s += len; 2371 } 2372 } 2373 2374 if (!write && !first && left) { 2375 if(put_user('\n', s)) 2376 return -EFAULT; 2377 left--, s++; 2378 } 2379 if (write) { 2380 while (left) { 2381 char c; 2382 if (get_user(c, s++)) 2383 return -EFAULT; 2384 if (!isspace(c)) 2385 break; 2386 left--; 2387 } 2388 } 2389 if (write && first) 2390 return -EINVAL; 2391 *lenp -= left; 2392 *ppos += *lenp; 2393 return 0; 2394 #undef TMPBUFLEN 2395 } 2396 2397 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2398 void __user *buffer, size_t *lenp, loff_t *ppos, 2399 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2400 int write, void *data), 2401 void *data) 2402 { 2403 return __do_proc_dointvec(table->data, table, write, filp, 2404 buffer, lenp, ppos, conv, data); 2405 } 2406 2407 /** 2408 * proc_dointvec - read a vector of integers 2409 * @table: the sysctl table 2410 * @write: %TRUE if this is a write to the sysctl file 2411 * @filp: the file structure 2412 * @buffer: the user buffer 2413 * @lenp: the size of the user buffer 2414 * @ppos: file position 2415 * 2416 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2417 * values from/to the user buffer, treated as an ASCII string. 2418 * 2419 * Returns 0 on success. 2420 */ 2421 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2422 void __user *buffer, size_t *lenp, loff_t *ppos) 2423 { 2424 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2425 NULL,NULL); 2426 } 2427 2428 /* 2429 * Taint values can only be increased 2430 * This means we can safely use a temporary. 2431 */ 2432 static int proc_taint(struct ctl_table *table, int write, struct file *filp, 2433 void __user *buffer, size_t *lenp, loff_t *ppos) 2434 { 2435 struct ctl_table t; 2436 unsigned long tmptaint = get_taint(); 2437 int err; 2438 2439 if (write && !capable(CAP_SYS_ADMIN)) 2440 return -EPERM; 2441 2442 t = *table; 2443 t.data = &tmptaint; 2444 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos); 2445 if (err < 0) 2446 return err; 2447 2448 if (write) { 2449 /* 2450 * Poor man's atomic or. Not worth adding a primitive 2451 * to everyone's atomic.h for this 2452 */ 2453 int i; 2454 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2455 if ((tmptaint >> i) & 1) 2456 add_taint(i); 2457 } 2458 } 2459 2460 return err; 2461 } 2462 2463 struct do_proc_dointvec_minmax_conv_param { 2464 int *min; 2465 int *max; 2466 }; 2467 2468 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 2469 int *valp, 2470 int write, void *data) 2471 { 2472 struct do_proc_dointvec_minmax_conv_param *param = data; 2473 if (write) { 2474 int val = *negp ? -*lvalp : *lvalp; 2475 if ((param->min && *param->min > val) || 2476 (param->max && *param->max < val)) 2477 return -EINVAL; 2478 *valp = val; 2479 } else { 2480 int val = *valp; 2481 if (val < 0) { 2482 *negp = -1; 2483 *lvalp = (unsigned long)-val; 2484 } else { 2485 *negp = 0; 2486 *lvalp = (unsigned long)val; 2487 } 2488 } 2489 return 0; 2490 } 2491 2492 /** 2493 * proc_dointvec_minmax - read a vector of integers with min/max values 2494 * @table: the sysctl table 2495 * @write: %TRUE if this is a write to the sysctl file 2496 * @filp: the file structure 2497 * @buffer: the user buffer 2498 * @lenp: the size of the user buffer 2499 * @ppos: file position 2500 * 2501 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2502 * values from/to the user buffer, treated as an ASCII string. 2503 * 2504 * This routine will ensure the values are within the range specified by 2505 * table->extra1 (min) and table->extra2 (max). 2506 * 2507 * Returns 0 on success. 2508 */ 2509 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2510 void __user *buffer, size_t *lenp, loff_t *ppos) 2511 { 2512 struct do_proc_dointvec_minmax_conv_param param = { 2513 .min = (int *) table->extra1, 2514 .max = (int *) table->extra2, 2515 }; 2516 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2517 do_proc_dointvec_minmax_conv, ¶m); 2518 } 2519 2520 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2521 struct file *filp, 2522 void __user *buffer, 2523 size_t *lenp, loff_t *ppos, 2524 unsigned long convmul, 2525 unsigned long convdiv) 2526 { 2527 #define TMPBUFLEN 21 2528 unsigned long *i, *min, *max, val; 2529 int vleft, first=1, neg; 2530 size_t len, left; 2531 char buf[TMPBUFLEN], *p; 2532 char __user *s = buffer; 2533 2534 if (!data || !table->maxlen || !*lenp || 2535 (*ppos && !write)) { 2536 *lenp = 0; 2537 return 0; 2538 } 2539 2540 i = (unsigned long *) data; 2541 min = (unsigned long *) table->extra1; 2542 max = (unsigned long *) table->extra2; 2543 vleft = table->maxlen / sizeof(unsigned long); 2544 left = *lenp; 2545 2546 for (; left && vleft--; i++, min++, max++, first=0) { 2547 if (write) { 2548 while (left) { 2549 char c; 2550 if (get_user(c, s)) 2551 return -EFAULT; 2552 if (!isspace(c)) 2553 break; 2554 left--; 2555 s++; 2556 } 2557 if (!left) 2558 break; 2559 neg = 0; 2560 len = left; 2561 if (len > TMPBUFLEN-1) 2562 len = TMPBUFLEN-1; 2563 if (copy_from_user(buf, s, len)) 2564 return -EFAULT; 2565 buf[len] = 0; 2566 p = buf; 2567 if (*p == '-' && left > 1) { 2568 neg = 1; 2569 p++; 2570 } 2571 if (*p < '0' || *p > '9') 2572 break; 2573 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 2574 len = p-buf; 2575 if ((len < left) && *p && !isspace(*p)) 2576 break; 2577 if (neg) 2578 val = -val; 2579 s += len; 2580 left -= len; 2581 2582 if(neg) 2583 continue; 2584 if ((min && val < *min) || (max && val > *max)) 2585 continue; 2586 *i = val; 2587 } else { 2588 p = buf; 2589 if (!first) 2590 *p++ = '\t'; 2591 sprintf(p, "%lu", convdiv * (*i) / convmul); 2592 len = strlen(buf); 2593 if (len > left) 2594 len = left; 2595 if(copy_to_user(s, buf, len)) 2596 return -EFAULT; 2597 left -= len; 2598 s += len; 2599 } 2600 } 2601 2602 if (!write && !first && left) { 2603 if(put_user('\n', s)) 2604 return -EFAULT; 2605 left--, s++; 2606 } 2607 if (write) { 2608 while (left) { 2609 char c; 2610 if (get_user(c, s++)) 2611 return -EFAULT; 2612 if (!isspace(c)) 2613 break; 2614 left--; 2615 } 2616 } 2617 if (write && first) 2618 return -EINVAL; 2619 *lenp -= left; 2620 *ppos += *lenp; 2621 return 0; 2622 #undef TMPBUFLEN 2623 } 2624 2625 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2626 struct file *filp, 2627 void __user *buffer, 2628 size_t *lenp, loff_t *ppos, 2629 unsigned long convmul, 2630 unsigned long convdiv) 2631 { 2632 return __do_proc_doulongvec_minmax(table->data, table, write, 2633 filp, buffer, lenp, ppos, convmul, convdiv); 2634 } 2635 2636 /** 2637 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2638 * @table: the sysctl table 2639 * @write: %TRUE if this is a write to the sysctl file 2640 * @filp: the file structure 2641 * @buffer: the user buffer 2642 * @lenp: the size of the user buffer 2643 * @ppos: file position 2644 * 2645 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2646 * values from/to the user buffer, treated as an ASCII string. 2647 * 2648 * This routine will ensure the values are within the range specified by 2649 * table->extra1 (min) and table->extra2 (max). 2650 * 2651 * Returns 0 on success. 2652 */ 2653 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2654 void __user *buffer, size_t *lenp, loff_t *ppos) 2655 { 2656 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 2657 } 2658 2659 /** 2660 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2661 * @table: the sysctl table 2662 * @write: %TRUE if this is a write to the sysctl file 2663 * @filp: the file structure 2664 * @buffer: the user buffer 2665 * @lenp: the size of the user buffer 2666 * @ppos: file position 2667 * 2668 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2669 * values from/to the user buffer, treated as an ASCII string. The values 2670 * are treated as milliseconds, and converted to jiffies when they are stored. 2671 * 2672 * This routine will ensure the values are within the range specified by 2673 * table->extra1 (min) and table->extra2 (max). 2674 * 2675 * Returns 0 on success. 2676 */ 2677 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2678 struct file *filp, 2679 void __user *buffer, 2680 size_t *lenp, loff_t *ppos) 2681 { 2682 return do_proc_doulongvec_minmax(table, write, filp, buffer, 2683 lenp, ppos, HZ, 1000l); 2684 } 2685 2686 2687 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2688 int *valp, 2689 int write, void *data) 2690 { 2691 if (write) { 2692 if (*lvalp > LONG_MAX / HZ) 2693 return 1; 2694 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2695 } else { 2696 int val = *valp; 2697 unsigned long lval; 2698 if (val < 0) { 2699 *negp = -1; 2700 lval = (unsigned long)-val; 2701 } else { 2702 *negp = 0; 2703 lval = (unsigned long)val; 2704 } 2705 *lvalp = lval / HZ; 2706 } 2707 return 0; 2708 } 2709 2710 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2711 int *valp, 2712 int write, void *data) 2713 { 2714 if (write) { 2715 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2716 return 1; 2717 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2718 } else { 2719 int val = *valp; 2720 unsigned long lval; 2721 if (val < 0) { 2722 *negp = -1; 2723 lval = (unsigned long)-val; 2724 } else { 2725 *negp = 0; 2726 lval = (unsigned long)val; 2727 } 2728 *lvalp = jiffies_to_clock_t(lval); 2729 } 2730 return 0; 2731 } 2732 2733 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2734 int *valp, 2735 int write, void *data) 2736 { 2737 if (write) { 2738 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2739 } else { 2740 int val = *valp; 2741 unsigned long lval; 2742 if (val < 0) { 2743 *negp = -1; 2744 lval = (unsigned long)-val; 2745 } else { 2746 *negp = 0; 2747 lval = (unsigned long)val; 2748 } 2749 *lvalp = jiffies_to_msecs(lval); 2750 } 2751 return 0; 2752 } 2753 2754 /** 2755 * proc_dointvec_jiffies - read a vector of integers as seconds 2756 * @table: the sysctl table 2757 * @write: %TRUE if this is a write to the sysctl file 2758 * @filp: the file structure 2759 * @buffer: the user buffer 2760 * @lenp: the size of the user buffer 2761 * @ppos: file position 2762 * 2763 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2764 * values from/to the user buffer, treated as an ASCII string. 2765 * The values read are assumed to be in seconds, and are converted into 2766 * jiffies. 2767 * 2768 * Returns 0 on success. 2769 */ 2770 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2771 void __user *buffer, size_t *lenp, loff_t *ppos) 2772 { 2773 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2774 do_proc_dointvec_jiffies_conv,NULL); 2775 } 2776 2777 /** 2778 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2779 * @table: the sysctl table 2780 * @write: %TRUE if this is a write to the sysctl file 2781 * @filp: the file structure 2782 * @buffer: the user buffer 2783 * @lenp: the size of the user buffer 2784 * @ppos: pointer to the file position 2785 * 2786 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2787 * values from/to the user buffer, treated as an ASCII string. 2788 * The values read are assumed to be in 1/USER_HZ seconds, and 2789 * are converted into jiffies. 2790 * 2791 * Returns 0 on success. 2792 */ 2793 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2794 void __user *buffer, size_t *lenp, loff_t *ppos) 2795 { 2796 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2797 do_proc_dointvec_userhz_jiffies_conv,NULL); 2798 } 2799 2800 /** 2801 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2802 * @table: the sysctl table 2803 * @write: %TRUE if this is a write to the sysctl file 2804 * @filp: the file structure 2805 * @buffer: the user buffer 2806 * @lenp: the size of the user buffer 2807 * @ppos: file position 2808 * @ppos: the current position in the file 2809 * 2810 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2811 * values from/to the user buffer, treated as an ASCII string. 2812 * The values read are assumed to be in 1/1000 seconds, and 2813 * are converted into jiffies. 2814 * 2815 * Returns 0 on success. 2816 */ 2817 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2818 void __user *buffer, size_t *lenp, loff_t *ppos) 2819 { 2820 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2821 do_proc_dointvec_ms_jiffies_conv, NULL); 2822 } 2823 2824 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 2825 void __user *buffer, size_t *lenp, loff_t *ppos) 2826 { 2827 struct pid *new_pid; 2828 pid_t tmp; 2829 int r; 2830 2831 tmp = pid_vnr(cad_pid); 2832 2833 r = __do_proc_dointvec(&tmp, table, write, filp, buffer, 2834 lenp, ppos, NULL, NULL); 2835 if (r || !write) 2836 return r; 2837 2838 new_pid = find_get_pid(tmp); 2839 if (!new_pid) 2840 return -ESRCH; 2841 2842 put_pid(xchg(&cad_pid, new_pid)); 2843 return 0; 2844 } 2845 2846 #else /* CONFIG_PROC_FS */ 2847 2848 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2849 void __user *buffer, size_t *lenp, loff_t *ppos) 2850 { 2851 return -ENOSYS; 2852 } 2853 2854 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2855 void __user *buffer, size_t *lenp, loff_t *ppos) 2856 { 2857 return -ENOSYS; 2858 } 2859 2860 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2861 void __user *buffer, size_t *lenp, loff_t *ppos) 2862 { 2863 return -ENOSYS; 2864 } 2865 2866 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2867 void __user *buffer, size_t *lenp, loff_t *ppos) 2868 { 2869 return -ENOSYS; 2870 } 2871 2872 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2873 void __user *buffer, size_t *lenp, loff_t *ppos) 2874 { 2875 return -ENOSYS; 2876 } 2877 2878 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2879 void __user *buffer, size_t *lenp, loff_t *ppos) 2880 { 2881 return -ENOSYS; 2882 } 2883 2884 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2885 void __user *buffer, size_t *lenp, loff_t *ppos) 2886 { 2887 return -ENOSYS; 2888 } 2889 2890 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2891 struct file *filp, 2892 void __user *buffer, 2893 size_t *lenp, loff_t *ppos) 2894 { 2895 return -ENOSYS; 2896 } 2897 2898 2899 #endif /* CONFIG_PROC_FS */ 2900 2901 2902 #ifdef CONFIG_SYSCTL_SYSCALL 2903 /* 2904 * General sysctl support routines 2905 */ 2906 2907 /* The generic sysctl data routine (used if no strategy routine supplied) */ 2908 int sysctl_data(struct ctl_table *table, 2909 void __user *oldval, size_t __user *oldlenp, 2910 void __user *newval, size_t newlen) 2911 { 2912 size_t len; 2913 2914 /* Get out of I don't have a variable */ 2915 if (!table->data || !table->maxlen) 2916 return -ENOTDIR; 2917 2918 if (oldval && oldlenp) { 2919 if (get_user(len, oldlenp)) 2920 return -EFAULT; 2921 if (len) { 2922 if (len > table->maxlen) 2923 len = table->maxlen; 2924 if (copy_to_user(oldval, table->data, len)) 2925 return -EFAULT; 2926 if (put_user(len, oldlenp)) 2927 return -EFAULT; 2928 } 2929 } 2930 2931 if (newval && newlen) { 2932 if (newlen > table->maxlen) 2933 newlen = table->maxlen; 2934 2935 if (copy_from_user(table->data, newval, newlen)) 2936 return -EFAULT; 2937 } 2938 return 1; 2939 } 2940 2941 /* The generic string strategy routine: */ 2942 int sysctl_string(struct ctl_table *table, 2943 void __user *oldval, size_t __user *oldlenp, 2944 void __user *newval, size_t newlen) 2945 { 2946 if (!table->data || !table->maxlen) 2947 return -ENOTDIR; 2948 2949 if (oldval && oldlenp) { 2950 size_t bufsize; 2951 if (get_user(bufsize, oldlenp)) 2952 return -EFAULT; 2953 if (bufsize) { 2954 size_t len = strlen(table->data), copied; 2955 2956 /* This shouldn't trigger for a well-formed sysctl */ 2957 if (len > table->maxlen) 2958 len = table->maxlen; 2959 2960 /* Copy up to a max of bufsize-1 bytes of the string */ 2961 copied = (len >= bufsize) ? bufsize - 1 : len; 2962 2963 if (copy_to_user(oldval, table->data, copied) || 2964 put_user(0, (char __user *)(oldval + copied))) 2965 return -EFAULT; 2966 if (put_user(len, oldlenp)) 2967 return -EFAULT; 2968 } 2969 } 2970 if (newval && newlen) { 2971 size_t len = newlen; 2972 if (len > table->maxlen) 2973 len = table->maxlen; 2974 if(copy_from_user(table->data, newval, len)) 2975 return -EFAULT; 2976 if (len == table->maxlen) 2977 len--; 2978 ((char *) table->data)[len] = 0; 2979 } 2980 return 1; 2981 } 2982 2983 /* 2984 * This function makes sure that all of the integers in the vector 2985 * are between the minimum and maximum values given in the arrays 2986 * table->extra1 and table->extra2, respectively. 2987 */ 2988 int sysctl_intvec(struct ctl_table *table, 2989 void __user *oldval, size_t __user *oldlenp, 2990 void __user *newval, size_t newlen) 2991 { 2992 2993 if (newval && newlen) { 2994 int __user *vec = (int __user *) newval; 2995 int *min = (int *) table->extra1; 2996 int *max = (int *) table->extra2; 2997 size_t length; 2998 int i; 2999 3000 if (newlen % sizeof(int) != 0) 3001 return -EINVAL; 3002 3003 if (!table->extra1 && !table->extra2) 3004 return 0; 3005 3006 if (newlen > table->maxlen) 3007 newlen = table->maxlen; 3008 length = newlen / sizeof(int); 3009 3010 for (i = 0; i < length; i++) { 3011 int value; 3012 if (get_user(value, vec + i)) 3013 return -EFAULT; 3014 if (min && value < min[i]) 3015 return -EINVAL; 3016 if (max && value > max[i]) 3017 return -EINVAL; 3018 } 3019 } 3020 return 0; 3021 } 3022 3023 /* Strategy function to convert jiffies to seconds */ 3024 int sysctl_jiffies(struct ctl_table *table, 3025 void __user *oldval, size_t __user *oldlenp, 3026 void __user *newval, size_t newlen) 3027 { 3028 if (oldval && oldlenp) { 3029 size_t olen; 3030 3031 if (get_user(olen, oldlenp)) 3032 return -EFAULT; 3033 if (olen) { 3034 int val; 3035 3036 if (olen < sizeof(int)) 3037 return -EINVAL; 3038 3039 val = *(int *)(table->data) / HZ; 3040 if (put_user(val, (int __user *)oldval)) 3041 return -EFAULT; 3042 if (put_user(sizeof(int), oldlenp)) 3043 return -EFAULT; 3044 } 3045 } 3046 if (newval && newlen) { 3047 int new; 3048 if (newlen != sizeof(int)) 3049 return -EINVAL; 3050 if (get_user(new, (int __user *)newval)) 3051 return -EFAULT; 3052 *(int *)(table->data) = new*HZ; 3053 } 3054 return 1; 3055 } 3056 3057 /* Strategy function to convert jiffies to seconds */ 3058 int sysctl_ms_jiffies(struct ctl_table *table, 3059 void __user *oldval, size_t __user *oldlenp, 3060 void __user *newval, size_t newlen) 3061 { 3062 if (oldval && oldlenp) { 3063 size_t olen; 3064 3065 if (get_user(olen, oldlenp)) 3066 return -EFAULT; 3067 if (olen) { 3068 int val; 3069 3070 if (olen < sizeof(int)) 3071 return -EINVAL; 3072 3073 val = jiffies_to_msecs(*(int *)(table->data)); 3074 if (put_user(val, (int __user *)oldval)) 3075 return -EFAULT; 3076 if (put_user(sizeof(int), oldlenp)) 3077 return -EFAULT; 3078 } 3079 } 3080 if (newval && newlen) { 3081 int new; 3082 if (newlen != sizeof(int)) 3083 return -EINVAL; 3084 if (get_user(new, (int __user *)newval)) 3085 return -EFAULT; 3086 *(int *)(table->data) = msecs_to_jiffies(new); 3087 } 3088 return 1; 3089 } 3090 3091 3092 3093 #else /* CONFIG_SYSCTL_SYSCALL */ 3094 3095 3096 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args) 3097 { 3098 struct __sysctl_args tmp; 3099 int error; 3100 3101 if (copy_from_user(&tmp, args, sizeof(tmp))) 3102 return -EFAULT; 3103 3104 error = deprecated_sysctl_warning(&tmp); 3105 3106 /* If no error reading the parameters then just -ENOSYS ... */ 3107 if (!error) 3108 error = -ENOSYS; 3109 3110 return error; 3111 } 3112 3113 int sysctl_data(struct ctl_table *table, 3114 void __user *oldval, size_t __user *oldlenp, 3115 void __user *newval, size_t newlen) 3116 { 3117 return -ENOSYS; 3118 } 3119 3120 int sysctl_string(struct ctl_table *table, 3121 void __user *oldval, size_t __user *oldlenp, 3122 void __user *newval, size_t newlen) 3123 { 3124 return -ENOSYS; 3125 } 3126 3127 int sysctl_intvec(struct ctl_table *table, 3128 void __user *oldval, size_t __user *oldlenp, 3129 void __user *newval, size_t newlen) 3130 { 3131 return -ENOSYS; 3132 } 3133 3134 int sysctl_jiffies(struct ctl_table *table, 3135 void __user *oldval, size_t __user *oldlenp, 3136 void __user *newval, size_t newlen) 3137 { 3138 return -ENOSYS; 3139 } 3140 3141 int sysctl_ms_jiffies(struct ctl_table *table, 3142 void __user *oldval, size_t __user *oldlenp, 3143 void __user *newval, size_t newlen) 3144 { 3145 return -ENOSYS; 3146 } 3147 3148 #endif /* CONFIG_SYSCTL_SYSCALL */ 3149 3150 static int deprecated_sysctl_warning(struct __sysctl_args *args) 3151 { 3152 static int msg_count; 3153 int name[CTL_MAXNAME]; 3154 int i; 3155 3156 /* Check args->nlen. */ 3157 if (args->nlen < 0 || args->nlen > CTL_MAXNAME) 3158 return -ENOTDIR; 3159 3160 /* Read in the sysctl name for better debug message logging */ 3161 for (i = 0; i < args->nlen; i++) 3162 if (get_user(name[i], args->name + i)) 3163 return -EFAULT; 3164 3165 /* Ignore accesses to kernel.version */ 3166 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) 3167 return 0; 3168 3169 if (msg_count < 5) { 3170 msg_count++; 3171 printk(KERN_INFO 3172 "warning: process `%s' used the deprecated sysctl " 3173 "system call with ", current->comm); 3174 for (i = 0; i < args->nlen; i++) 3175 printk("%d.", name[i]); 3176 printk("\n"); 3177 } 3178 return 0; 3179 } 3180 3181 /* 3182 * No sense putting this after each symbol definition, twice, 3183 * exception granted :-) 3184 */ 3185 EXPORT_SYMBOL(proc_dointvec); 3186 EXPORT_SYMBOL(proc_dointvec_jiffies); 3187 EXPORT_SYMBOL(proc_dointvec_minmax); 3188 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3189 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3190 EXPORT_SYMBOL(proc_dostring); 3191 EXPORT_SYMBOL(proc_doulongvec_minmax); 3192 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3193 EXPORT_SYMBOL(register_sysctl_table); 3194 EXPORT_SYMBOL(register_sysctl_paths); 3195 EXPORT_SYMBOL(sysctl_intvec); 3196 EXPORT_SYMBOL(sysctl_jiffies); 3197 EXPORT_SYMBOL(sysctl_ms_jiffies); 3198 EXPORT_SYMBOL(sysctl_string); 3199 EXPORT_SYMBOL(sysctl_data); 3200 EXPORT_SYMBOL(unregister_sysctl_table); 3201