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/kmemcheck.h> 30 #include <linux/fs.h> 31 #include <linux/init.h> 32 #include <linux/kernel.h> 33 #include <linux/kobject.h> 34 #include <linux/net.h> 35 #include <linux/sysrq.h> 36 #include <linux/highuid.h> 37 #include <linux/writeback.h> 38 #include <linux/ratelimit.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 #include <linux/slow-work.h> 52 #include <linux/perf_event.h> 53 #include <linux/kprobes.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 65 #if defined(CONFIG_SYSCTL) 66 67 /* External variables not in a header file. */ 68 extern int C_A_D; 69 extern int print_fatal_signals; 70 extern int sysctl_overcommit_memory; 71 extern int sysctl_overcommit_ratio; 72 extern int sysctl_panic_on_oom; 73 extern int sysctl_oom_kill_allocating_task; 74 extern int sysctl_oom_dump_tasks; 75 extern int max_threads; 76 extern int core_uses_pid; 77 extern int suid_dumpable; 78 extern char core_pattern[]; 79 extern unsigned int core_pipe_limit; 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 #ifdef CONFIG_BLOCK 95 extern int blk_iopoll_enabled; 96 #endif 97 98 /* Constants used for minimum and maximum */ 99 #ifdef CONFIG_DETECT_SOFTLOCKUP 100 static int sixty = 60; 101 static int neg_one = -1; 102 #endif 103 104 static int zero; 105 static int __maybe_unused one = 1; 106 static int __maybe_unused two = 2; 107 static unsigned long one_ul = 1; 108 static int one_hundred = 100; 109 #ifdef CONFIG_PRINTK 110 static int ten_thousand = 10000; 111 #endif 112 113 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 114 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 115 116 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 117 static int maxolduid = 65535; 118 static int minolduid; 119 static int min_percpu_pagelist_fract = 8; 120 121 static int ngroups_max = NGROUPS_MAX; 122 123 #ifdef CONFIG_MODULES 124 extern char modprobe_path[]; 125 extern int modules_disabled; 126 #endif 127 #ifdef CONFIG_CHR_DEV_SG 128 extern int sg_big_buff; 129 #endif 130 131 #ifdef CONFIG_SPARC 132 #include <asm/system.h> 133 #endif 134 135 #ifdef CONFIG_SPARC64 136 extern int sysctl_tsb_ratio; 137 #endif 138 139 #ifdef __hppa__ 140 extern int pwrsw_enabled; 141 extern int unaligned_enabled; 142 #endif 143 144 #ifdef CONFIG_S390 145 #ifdef CONFIG_MATHEMU 146 extern int sysctl_ieee_emulation_warnings; 147 #endif 148 extern int sysctl_userprocess_debug; 149 extern int spin_retry; 150 #endif 151 152 #ifdef CONFIG_BSD_PROCESS_ACCT 153 extern int acct_parm[]; 154 #endif 155 156 #ifdef CONFIG_IA64 157 extern int no_unaligned_warning; 158 extern int unaligned_dump_stack; 159 #endif 160 161 extern struct ratelimit_state printk_ratelimit_state; 162 163 #ifdef CONFIG_RT_MUTEXES 164 extern int max_lock_depth; 165 #endif 166 167 #ifdef CONFIG_PROC_SYSCTL 168 static int proc_do_cad_pid(struct ctl_table *table, int write, 169 void __user *buffer, size_t *lenp, loff_t *ppos); 170 static int proc_taint(struct ctl_table *table, int write, 171 void __user *buffer, size_t *lenp, loff_t *ppos); 172 #endif 173 174 static struct ctl_table root_table[]; 175 static struct ctl_table_root sysctl_table_root; 176 static struct ctl_table_header root_table_header = { 177 .count = 1, 178 .ctl_table = root_table, 179 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 180 .root = &sysctl_table_root, 181 .set = &sysctl_table_root.default_set, 182 }; 183 static struct ctl_table_root sysctl_table_root = { 184 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 185 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 186 }; 187 188 static struct ctl_table kern_table[]; 189 static struct ctl_table vm_table[]; 190 static struct ctl_table fs_table[]; 191 static struct ctl_table debug_table[]; 192 static struct ctl_table dev_table[]; 193 extern struct ctl_table random_table[]; 194 #ifdef CONFIG_INOTIFY_USER 195 extern struct ctl_table inotify_table[]; 196 #endif 197 #ifdef CONFIG_EPOLL 198 extern struct ctl_table epoll_table[]; 199 #endif 200 201 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 202 int sysctl_legacy_va_layout; 203 #endif 204 205 extern int prove_locking; 206 extern int lock_stat; 207 208 /* The default sysctl tables: */ 209 210 static struct ctl_table root_table[] = { 211 { 212 .procname = "kernel", 213 .mode = 0555, 214 .child = kern_table, 215 }, 216 { 217 .procname = "vm", 218 .mode = 0555, 219 .child = vm_table, 220 }, 221 { 222 .procname = "fs", 223 .mode = 0555, 224 .child = fs_table, 225 }, 226 { 227 .procname = "debug", 228 .mode = 0555, 229 .child = debug_table, 230 }, 231 { 232 .procname = "dev", 233 .mode = 0555, 234 .child = dev_table, 235 }, 236 /* 237 * NOTE: do not add new entries to this table unless you have read 238 * Documentation/sysctl/ctl_unnumbered.txt 239 */ 240 { } 241 }; 242 243 #ifdef CONFIG_SCHED_DEBUG 244 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 245 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 246 static int min_wakeup_granularity_ns; /* 0 usecs */ 247 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 248 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 249 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 250 static int min_sched_shares_ratelimit = 100000; /* 100 usec */ 251 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */ 252 #endif 253 254 static struct ctl_table kern_table[] = { 255 { 256 .procname = "sched_child_runs_first", 257 .data = &sysctl_sched_child_runs_first, 258 .maxlen = sizeof(unsigned int), 259 .mode = 0644, 260 .proc_handler = proc_dointvec, 261 }, 262 #ifdef CONFIG_SCHED_DEBUG 263 { 264 .procname = "sched_min_granularity_ns", 265 .data = &sysctl_sched_min_granularity, 266 .maxlen = sizeof(unsigned int), 267 .mode = 0644, 268 .proc_handler = sched_proc_update_handler, 269 .extra1 = &min_sched_granularity_ns, 270 .extra2 = &max_sched_granularity_ns, 271 }, 272 { 273 .procname = "sched_latency_ns", 274 .data = &sysctl_sched_latency, 275 .maxlen = sizeof(unsigned int), 276 .mode = 0644, 277 .proc_handler = sched_proc_update_handler, 278 .extra1 = &min_sched_granularity_ns, 279 .extra2 = &max_sched_granularity_ns, 280 }, 281 { 282 .procname = "sched_wakeup_granularity_ns", 283 .data = &sysctl_sched_wakeup_granularity, 284 .maxlen = sizeof(unsigned int), 285 .mode = 0644, 286 .proc_handler = sched_proc_update_handler, 287 .extra1 = &min_wakeup_granularity_ns, 288 .extra2 = &max_wakeup_granularity_ns, 289 }, 290 { 291 .procname = "sched_shares_ratelimit", 292 .data = &sysctl_sched_shares_ratelimit, 293 .maxlen = sizeof(unsigned int), 294 .mode = 0644, 295 .proc_handler = sched_proc_update_handler, 296 .extra1 = &min_sched_shares_ratelimit, 297 .extra2 = &max_sched_shares_ratelimit, 298 }, 299 { 300 .procname = "sched_tunable_scaling", 301 .data = &sysctl_sched_tunable_scaling, 302 .maxlen = sizeof(enum sched_tunable_scaling), 303 .mode = 0644, 304 .proc_handler = sched_proc_update_handler, 305 .extra1 = &min_sched_tunable_scaling, 306 .extra2 = &max_sched_tunable_scaling, 307 }, 308 { 309 .procname = "sched_shares_thresh", 310 .data = &sysctl_sched_shares_thresh, 311 .maxlen = sizeof(unsigned int), 312 .mode = 0644, 313 .proc_handler = proc_dointvec_minmax, 314 .extra1 = &zero, 315 }, 316 { 317 .procname = "sched_migration_cost", 318 .data = &sysctl_sched_migration_cost, 319 .maxlen = sizeof(unsigned int), 320 .mode = 0644, 321 .proc_handler = proc_dointvec, 322 }, 323 { 324 .procname = "sched_nr_migrate", 325 .data = &sysctl_sched_nr_migrate, 326 .maxlen = sizeof(unsigned int), 327 .mode = 0644, 328 .proc_handler = proc_dointvec, 329 }, 330 { 331 .procname = "sched_time_avg", 332 .data = &sysctl_sched_time_avg, 333 .maxlen = sizeof(unsigned int), 334 .mode = 0644, 335 .proc_handler = proc_dointvec, 336 }, 337 { 338 .procname = "timer_migration", 339 .data = &sysctl_timer_migration, 340 .maxlen = sizeof(unsigned int), 341 .mode = 0644, 342 .proc_handler = proc_dointvec_minmax, 343 .extra1 = &zero, 344 .extra2 = &one, 345 }, 346 #endif 347 { 348 .procname = "sched_rt_period_us", 349 .data = &sysctl_sched_rt_period, 350 .maxlen = sizeof(unsigned int), 351 .mode = 0644, 352 .proc_handler = sched_rt_handler, 353 }, 354 { 355 .procname = "sched_rt_runtime_us", 356 .data = &sysctl_sched_rt_runtime, 357 .maxlen = sizeof(int), 358 .mode = 0644, 359 .proc_handler = sched_rt_handler, 360 }, 361 { 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 .procname = "prove_locking", 371 .data = &prove_locking, 372 .maxlen = sizeof(int), 373 .mode = 0644, 374 .proc_handler = proc_dointvec, 375 }, 376 #endif 377 #ifdef CONFIG_LOCK_STAT 378 { 379 .procname = "lock_stat", 380 .data = &lock_stat, 381 .maxlen = sizeof(int), 382 .mode = 0644, 383 .proc_handler = proc_dointvec, 384 }, 385 #endif 386 { 387 .procname = "panic", 388 .data = &panic_timeout, 389 .maxlen = sizeof(int), 390 .mode = 0644, 391 .proc_handler = proc_dointvec, 392 }, 393 { 394 .procname = "core_uses_pid", 395 .data = &core_uses_pid, 396 .maxlen = sizeof(int), 397 .mode = 0644, 398 .proc_handler = proc_dointvec, 399 }, 400 { 401 .procname = "core_pattern", 402 .data = core_pattern, 403 .maxlen = CORENAME_MAX_SIZE, 404 .mode = 0644, 405 .proc_handler = proc_dostring, 406 }, 407 { 408 .procname = "core_pipe_limit", 409 .data = &core_pipe_limit, 410 .maxlen = sizeof(unsigned int), 411 .mode = 0644, 412 .proc_handler = proc_dointvec, 413 }, 414 #ifdef CONFIG_PROC_SYSCTL 415 { 416 .procname = "tainted", 417 .maxlen = sizeof(long), 418 .mode = 0644, 419 .proc_handler = proc_taint, 420 }, 421 #endif 422 #ifdef CONFIG_LATENCYTOP 423 { 424 .procname = "latencytop", 425 .data = &latencytop_enabled, 426 .maxlen = sizeof(int), 427 .mode = 0644, 428 .proc_handler = proc_dointvec, 429 }, 430 #endif 431 #ifdef CONFIG_BLK_DEV_INITRD 432 { 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 .procname = "print-fatal-signals", 442 .data = &print_fatal_signals, 443 .maxlen = sizeof(int), 444 .mode = 0644, 445 .proc_handler = proc_dointvec, 446 }, 447 #ifdef CONFIG_SPARC 448 { 449 .procname = "reboot-cmd", 450 .data = reboot_command, 451 .maxlen = 256, 452 .mode = 0644, 453 .proc_handler = proc_dostring, 454 }, 455 { 456 .procname = "stop-a", 457 .data = &stop_a_enabled, 458 .maxlen = sizeof (int), 459 .mode = 0644, 460 .proc_handler = proc_dointvec, 461 }, 462 { 463 .procname = "scons-poweroff", 464 .data = &scons_pwroff, 465 .maxlen = sizeof (int), 466 .mode = 0644, 467 .proc_handler = proc_dointvec, 468 }, 469 #endif 470 #ifdef CONFIG_SPARC64 471 { 472 .procname = "tsb-ratio", 473 .data = &sysctl_tsb_ratio, 474 .maxlen = sizeof (int), 475 .mode = 0644, 476 .proc_handler = proc_dointvec, 477 }, 478 #endif 479 #ifdef __hppa__ 480 { 481 .procname = "soft-power", 482 .data = &pwrsw_enabled, 483 .maxlen = sizeof (int), 484 .mode = 0644, 485 .proc_handler = proc_dointvec, 486 }, 487 { 488 .procname = "unaligned-trap", 489 .data = &unaligned_enabled, 490 .maxlen = sizeof (int), 491 .mode = 0644, 492 .proc_handler = proc_dointvec, 493 }, 494 #endif 495 { 496 .procname = "ctrl-alt-del", 497 .data = &C_A_D, 498 .maxlen = sizeof(int), 499 .mode = 0644, 500 .proc_handler = proc_dointvec, 501 }, 502 #ifdef CONFIG_FUNCTION_TRACER 503 { 504 .procname = "ftrace_enabled", 505 .data = &ftrace_enabled, 506 .maxlen = sizeof(int), 507 .mode = 0644, 508 .proc_handler = ftrace_enable_sysctl, 509 }, 510 #endif 511 #ifdef CONFIG_STACK_TRACER 512 { 513 .procname = "stack_tracer_enabled", 514 .data = &stack_tracer_enabled, 515 .maxlen = sizeof(int), 516 .mode = 0644, 517 .proc_handler = stack_trace_sysctl, 518 }, 519 #endif 520 #ifdef CONFIG_TRACING 521 { 522 .procname = "ftrace_dump_on_oops", 523 .data = &ftrace_dump_on_oops, 524 .maxlen = sizeof(int), 525 .mode = 0644, 526 .proc_handler = proc_dointvec, 527 }, 528 #endif 529 #ifdef CONFIG_MODULES 530 { 531 .procname = "modprobe", 532 .data = &modprobe_path, 533 .maxlen = KMOD_PATH_LEN, 534 .mode = 0644, 535 .proc_handler = proc_dostring, 536 }, 537 { 538 .procname = "modules_disabled", 539 .data = &modules_disabled, 540 .maxlen = sizeof(int), 541 .mode = 0644, 542 /* only handle a transition from default "0" to "1" */ 543 .proc_handler = proc_dointvec_minmax, 544 .extra1 = &one, 545 .extra2 = &one, 546 }, 547 #endif 548 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) 549 { 550 .procname = "hotplug", 551 .data = &uevent_helper, 552 .maxlen = UEVENT_HELPER_PATH_LEN, 553 .mode = 0644, 554 .proc_handler = proc_dostring, 555 }, 556 #endif 557 #ifdef CONFIG_CHR_DEV_SG 558 { 559 .procname = "sg-big-buff", 560 .data = &sg_big_buff, 561 .maxlen = sizeof (int), 562 .mode = 0444, 563 .proc_handler = proc_dointvec, 564 }, 565 #endif 566 #ifdef CONFIG_BSD_PROCESS_ACCT 567 { 568 .procname = "acct", 569 .data = &acct_parm, 570 .maxlen = 3*sizeof(int), 571 .mode = 0644, 572 .proc_handler = proc_dointvec, 573 }, 574 #endif 575 #ifdef CONFIG_MAGIC_SYSRQ 576 { 577 .procname = "sysrq", 578 .data = &__sysrq_enabled, 579 .maxlen = sizeof (int), 580 .mode = 0644, 581 .proc_handler = proc_dointvec, 582 }, 583 #endif 584 #ifdef CONFIG_PROC_SYSCTL 585 { 586 .procname = "cad_pid", 587 .data = NULL, 588 .maxlen = sizeof (int), 589 .mode = 0600, 590 .proc_handler = proc_do_cad_pid, 591 }, 592 #endif 593 { 594 .procname = "threads-max", 595 .data = &max_threads, 596 .maxlen = sizeof(int), 597 .mode = 0644, 598 .proc_handler = proc_dointvec, 599 }, 600 { 601 .procname = "random", 602 .mode = 0555, 603 .child = random_table, 604 }, 605 { 606 .procname = "overflowuid", 607 .data = &overflowuid, 608 .maxlen = sizeof(int), 609 .mode = 0644, 610 .proc_handler = proc_dointvec_minmax, 611 .extra1 = &minolduid, 612 .extra2 = &maxolduid, 613 }, 614 { 615 .procname = "overflowgid", 616 .data = &overflowgid, 617 .maxlen = sizeof(int), 618 .mode = 0644, 619 .proc_handler = proc_dointvec_minmax, 620 .extra1 = &minolduid, 621 .extra2 = &maxolduid, 622 }, 623 #ifdef CONFIG_S390 624 #ifdef CONFIG_MATHEMU 625 { 626 .procname = "ieee_emulation_warnings", 627 .data = &sysctl_ieee_emulation_warnings, 628 .maxlen = sizeof(int), 629 .mode = 0644, 630 .proc_handler = proc_dointvec, 631 }, 632 #endif 633 { 634 .procname = "userprocess_debug", 635 .data = &sysctl_userprocess_debug, 636 .maxlen = sizeof(int), 637 .mode = 0644, 638 .proc_handler = proc_dointvec, 639 }, 640 #endif 641 { 642 .procname = "pid_max", 643 .data = &pid_max, 644 .maxlen = sizeof (int), 645 .mode = 0644, 646 .proc_handler = proc_dointvec_minmax, 647 .extra1 = &pid_max_min, 648 .extra2 = &pid_max_max, 649 }, 650 { 651 .procname = "panic_on_oops", 652 .data = &panic_on_oops, 653 .maxlen = sizeof(int), 654 .mode = 0644, 655 .proc_handler = proc_dointvec, 656 }, 657 #if defined CONFIG_PRINTK 658 { 659 .procname = "printk", 660 .data = &console_loglevel, 661 .maxlen = 4*sizeof(int), 662 .mode = 0644, 663 .proc_handler = proc_dointvec, 664 }, 665 { 666 .procname = "printk_ratelimit", 667 .data = &printk_ratelimit_state.interval, 668 .maxlen = sizeof(int), 669 .mode = 0644, 670 .proc_handler = proc_dointvec_jiffies, 671 }, 672 { 673 .procname = "printk_ratelimit_burst", 674 .data = &printk_ratelimit_state.burst, 675 .maxlen = sizeof(int), 676 .mode = 0644, 677 .proc_handler = proc_dointvec, 678 }, 679 { 680 .procname = "printk_delay", 681 .data = &printk_delay_msec, 682 .maxlen = sizeof(int), 683 .mode = 0644, 684 .proc_handler = proc_dointvec_minmax, 685 .extra1 = &zero, 686 .extra2 = &ten_thousand, 687 }, 688 #endif 689 { 690 .procname = "ngroups_max", 691 .data = &ngroups_max, 692 .maxlen = sizeof (int), 693 .mode = 0444, 694 .proc_handler = proc_dointvec, 695 }, 696 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 697 { 698 .procname = "unknown_nmi_panic", 699 .data = &unknown_nmi_panic, 700 .maxlen = sizeof (int), 701 .mode = 0644, 702 .proc_handler = proc_dointvec, 703 }, 704 { 705 .procname = "nmi_watchdog", 706 .data = &nmi_watchdog_enabled, 707 .maxlen = sizeof (int), 708 .mode = 0644, 709 .proc_handler = proc_nmi_enabled, 710 }, 711 #endif 712 #if defined(CONFIG_X86) 713 { 714 .procname = "panic_on_unrecovered_nmi", 715 .data = &panic_on_unrecovered_nmi, 716 .maxlen = sizeof(int), 717 .mode = 0644, 718 .proc_handler = proc_dointvec, 719 }, 720 { 721 .procname = "panic_on_io_nmi", 722 .data = &panic_on_io_nmi, 723 .maxlen = sizeof(int), 724 .mode = 0644, 725 .proc_handler = proc_dointvec, 726 }, 727 { 728 .procname = "bootloader_type", 729 .data = &bootloader_type, 730 .maxlen = sizeof (int), 731 .mode = 0444, 732 .proc_handler = proc_dointvec, 733 }, 734 { 735 .procname = "bootloader_version", 736 .data = &bootloader_version, 737 .maxlen = sizeof (int), 738 .mode = 0444, 739 .proc_handler = proc_dointvec, 740 }, 741 { 742 .procname = "kstack_depth_to_print", 743 .data = &kstack_depth_to_print, 744 .maxlen = sizeof(int), 745 .mode = 0644, 746 .proc_handler = proc_dointvec, 747 }, 748 { 749 .procname = "io_delay_type", 750 .data = &io_delay_type, 751 .maxlen = sizeof(int), 752 .mode = 0644, 753 .proc_handler = proc_dointvec, 754 }, 755 #endif 756 #if defined(CONFIG_MMU) 757 { 758 .procname = "randomize_va_space", 759 .data = &randomize_va_space, 760 .maxlen = sizeof(int), 761 .mode = 0644, 762 .proc_handler = proc_dointvec, 763 }, 764 #endif 765 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 766 { 767 .procname = "spin_retry", 768 .data = &spin_retry, 769 .maxlen = sizeof (int), 770 .mode = 0644, 771 .proc_handler = proc_dointvec, 772 }, 773 #endif 774 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 775 { 776 .procname = "acpi_video_flags", 777 .data = &acpi_realmode_flags, 778 .maxlen = sizeof (unsigned long), 779 .mode = 0644, 780 .proc_handler = proc_doulongvec_minmax, 781 }, 782 #endif 783 #ifdef CONFIG_IA64 784 { 785 .procname = "ignore-unaligned-usertrap", 786 .data = &no_unaligned_warning, 787 .maxlen = sizeof (int), 788 .mode = 0644, 789 .proc_handler = proc_dointvec, 790 }, 791 { 792 .procname = "unaligned-dump-stack", 793 .data = &unaligned_dump_stack, 794 .maxlen = sizeof (int), 795 .mode = 0644, 796 .proc_handler = proc_dointvec, 797 }, 798 #endif 799 #ifdef CONFIG_DETECT_SOFTLOCKUP 800 { 801 .procname = "softlockup_panic", 802 .data = &softlockup_panic, 803 .maxlen = sizeof(int), 804 .mode = 0644, 805 .proc_handler = proc_dointvec_minmax, 806 .extra1 = &zero, 807 .extra2 = &one, 808 }, 809 { 810 .procname = "softlockup_thresh", 811 .data = &softlockup_thresh, 812 .maxlen = sizeof(int), 813 .mode = 0644, 814 .proc_handler = proc_dosoftlockup_thresh, 815 .extra1 = &neg_one, 816 .extra2 = &sixty, 817 }, 818 #endif 819 #ifdef CONFIG_DETECT_HUNG_TASK 820 { 821 .procname = "hung_task_panic", 822 .data = &sysctl_hung_task_panic, 823 .maxlen = sizeof(int), 824 .mode = 0644, 825 .proc_handler = proc_dointvec_minmax, 826 .extra1 = &zero, 827 .extra2 = &one, 828 }, 829 { 830 .procname = "hung_task_check_count", 831 .data = &sysctl_hung_task_check_count, 832 .maxlen = sizeof(unsigned long), 833 .mode = 0644, 834 .proc_handler = proc_doulongvec_minmax, 835 }, 836 { 837 .procname = "hung_task_timeout_secs", 838 .data = &sysctl_hung_task_timeout_secs, 839 .maxlen = sizeof(unsigned long), 840 .mode = 0644, 841 .proc_handler = proc_dohung_task_timeout_secs, 842 }, 843 { 844 .procname = "hung_task_warnings", 845 .data = &sysctl_hung_task_warnings, 846 .maxlen = sizeof(unsigned long), 847 .mode = 0644, 848 .proc_handler = proc_doulongvec_minmax, 849 }, 850 #endif 851 #ifdef CONFIG_COMPAT 852 { 853 .procname = "compat-log", 854 .data = &compat_log, 855 .maxlen = sizeof (int), 856 .mode = 0644, 857 .proc_handler = proc_dointvec, 858 }, 859 #endif 860 #ifdef CONFIG_RT_MUTEXES 861 { 862 .procname = "max_lock_depth", 863 .data = &max_lock_depth, 864 .maxlen = sizeof(int), 865 .mode = 0644, 866 .proc_handler = proc_dointvec, 867 }, 868 #endif 869 { 870 .procname = "poweroff_cmd", 871 .data = &poweroff_cmd, 872 .maxlen = POWEROFF_CMD_PATH_LEN, 873 .mode = 0644, 874 .proc_handler = proc_dostring, 875 }, 876 #ifdef CONFIG_KEYS 877 { 878 .procname = "keys", 879 .mode = 0555, 880 .child = key_sysctls, 881 }, 882 #endif 883 #ifdef CONFIG_RCU_TORTURE_TEST 884 { 885 .procname = "rcutorture_runnable", 886 .data = &rcutorture_runnable, 887 .maxlen = sizeof(int), 888 .mode = 0644, 889 .proc_handler = proc_dointvec, 890 }, 891 #endif 892 #ifdef CONFIG_SLOW_WORK 893 { 894 .procname = "slow-work", 895 .mode = 0555, 896 .child = slow_work_sysctls, 897 }, 898 #endif 899 #ifdef CONFIG_PERF_EVENTS 900 { 901 .procname = "perf_event_paranoid", 902 .data = &sysctl_perf_event_paranoid, 903 .maxlen = sizeof(sysctl_perf_event_paranoid), 904 .mode = 0644, 905 .proc_handler = proc_dointvec, 906 }, 907 { 908 .procname = "perf_event_mlock_kb", 909 .data = &sysctl_perf_event_mlock, 910 .maxlen = sizeof(sysctl_perf_event_mlock), 911 .mode = 0644, 912 .proc_handler = proc_dointvec, 913 }, 914 { 915 .procname = "perf_event_max_sample_rate", 916 .data = &sysctl_perf_event_sample_rate, 917 .maxlen = sizeof(sysctl_perf_event_sample_rate), 918 .mode = 0644, 919 .proc_handler = proc_dointvec, 920 }, 921 #endif 922 #ifdef CONFIG_KMEMCHECK 923 { 924 .procname = "kmemcheck", 925 .data = &kmemcheck_enabled, 926 .maxlen = sizeof(int), 927 .mode = 0644, 928 .proc_handler = proc_dointvec, 929 }, 930 #endif 931 #ifdef CONFIG_BLOCK 932 { 933 .procname = "blk_iopoll", 934 .data = &blk_iopoll_enabled, 935 .maxlen = sizeof(int), 936 .mode = 0644, 937 .proc_handler = proc_dointvec, 938 }, 939 #endif 940 /* 941 * NOTE: do not add new entries to this table unless you have read 942 * Documentation/sysctl/ctl_unnumbered.txt 943 */ 944 { } 945 }; 946 947 static struct ctl_table vm_table[] = { 948 { 949 .procname = "overcommit_memory", 950 .data = &sysctl_overcommit_memory, 951 .maxlen = sizeof(sysctl_overcommit_memory), 952 .mode = 0644, 953 .proc_handler = proc_dointvec, 954 }, 955 { 956 .procname = "panic_on_oom", 957 .data = &sysctl_panic_on_oom, 958 .maxlen = sizeof(sysctl_panic_on_oom), 959 .mode = 0644, 960 .proc_handler = proc_dointvec, 961 }, 962 { 963 .procname = "oom_kill_allocating_task", 964 .data = &sysctl_oom_kill_allocating_task, 965 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 966 .mode = 0644, 967 .proc_handler = proc_dointvec, 968 }, 969 { 970 .procname = "oom_dump_tasks", 971 .data = &sysctl_oom_dump_tasks, 972 .maxlen = sizeof(sysctl_oom_dump_tasks), 973 .mode = 0644, 974 .proc_handler = proc_dointvec, 975 }, 976 { 977 .procname = "overcommit_ratio", 978 .data = &sysctl_overcommit_ratio, 979 .maxlen = sizeof(sysctl_overcommit_ratio), 980 .mode = 0644, 981 .proc_handler = proc_dointvec, 982 }, 983 { 984 .procname = "page-cluster", 985 .data = &page_cluster, 986 .maxlen = sizeof(int), 987 .mode = 0644, 988 .proc_handler = proc_dointvec, 989 }, 990 { 991 .procname = "dirty_background_ratio", 992 .data = &dirty_background_ratio, 993 .maxlen = sizeof(dirty_background_ratio), 994 .mode = 0644, 995 .proc_handler = dirty_background_ratio_handler, 996 .extra1 = &zero, 997 .extra2 = &one_hundred, 998 }, 999 { 1000 .procname = "dirty_background_bytes", 1001 .data = &dirty_background_bytes, 1002 .maxlen = sizeof(dirty_background_bytes), 1003 .mode = 0644, 1004 .proc_handler = dirty_background_bytes_handler, 1005 .extra1 = &one_ul, 1006 }, 1007 { 1008 .procname = "dirty_ratio", 1009 .data = &vm_dirty_ratio, 1010 .maxlen = sizeof(vm_dirty_ratio), 1011 .mode = 0644, 1012 .proc_handler = dirty_ratio_handler, 1013 .extra1 = &zero, 1014 .extra2 = &one_hundred, 1015 }, 1016 { 1017 .procname = "dirty_bytes", 1018 .data = &vm_dirty_bytes, 1019 .maxlen = sizeof(vm_dirty_bytes), 1020 .mode = 0644, 1021 .proc_handler = dirty_bytes_handler, 1022 .extra1 = &dirty_bytes_min, 1023 }, 1024 { 1025 .procname = "dirty_writeback_centisecs", 1026 .data = &dirty_writeback_interval, 1027 .maxlen = sizeof(dirty_writeback_interval), 1028 .mode = 0644, 1029 .proc_handler = dirty_writeback_centisecs_handler, 1030 }, 1031 { 1032 .procname = "dirty_expire_centisecs", 1033 .data = &dirty_expire_interval, 1034 .maxlen = sizeof(dirty_expire_interval), 1035 .mode = 0644, 1036 .proc_handler = proc_dointvec, 1037 }, 1038 { 1039 .procname = "nr_pdflush_threads", 1040 .data = &nr_pdflush_threads, 1041 .maxlen = sizeof nr_pdflush_threads, 1042 .mode = 0444 /* read-only*/, 1043 .proc_handler = proc_dointvec, 1044 }, 1045 { 1046 .procname = "swappiness", 1047 .data = &vm_swappiness, 1048 .maxlen = sizeof(vm_swappiness), 1049 .mode = 0644, 1050 .proc_handler = proc_dointvec_minmax, 1051 .extra1 = &zero, 1052 .extra2 = &one_hundred, 1053 }, 1054 #ifdef CONFIG_HUGETLB_PAGE 1055 { 1056 .procname = "nr_hugepages", 1057 .data = NULL, 1058 .maxlen = sizeof(unsigned long), 1059 .mode = 0644, 1060 .proc_handler = hugetlb_sysctl_handler, 1061 .extra1 = (void *)&hugetlb_zero, 1062 .extra2 = (void *)&hugetlb_infinity, 1063 }, 1064 #ifdef CONFIG_NUMA 1065 { 1066 .procname = "nr_hugepages_mempolicy", 1067 .data = NULL, 1068 .maxlen = sizeof(unsigned long), 1069 .mode = 0644, 1070 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1071 .extra1 = (void *)&hugetlb_zero, 1072 .extra2 = (void *)&hugetlb_infinity, 1073 }, 1074 #endif 1075 { 1076 .procname = "hugetlb_shm_group", 1077 .data = &sysctl_hugetlb_shm_group, 1078 .maxlen = sizeof(gid_t), 1079 .mode = 0644, 1080 .proc_handler = proc_dointvec, 1081 }, 1082 { 1083 .procname = "hugepages_treat_as_movable", 1084 .data = &hugepages_treat_as_movable, 1085 .maxlen = sizeof(int), 1086 .mode = 0644, 1087 .proc_handler = hugetlb_treat_movable_handler, 1088 }, 1089 { 1090 .procname = "nr_overcommit_hugepages", 1091 .data = NULL, 1092 .maxlen = sizeof(unsigned long), 1093 .mode = 0644, 1094 .proc_handler = hugetlb_overcommit_handler, 1095 .extra1 = (void *)&hugetlb_zero, 1096 .extra2 = (void *)&hugetlb_infinity, 1097 }, 1098 #endif 1099 { 1100 .procname = "lowmem_reserve_ratio", 1101 .data = &sysctl_lowmem_reserve_ratio, 1102 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1103 .mode = 0644, 1104 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1105 }, 1106 { 1107 .procname = "drop_caches", 1108 .data = &sysctl_drop_caches, 1109 .maxlen = sizeof(int), 1110 .mode = 0644, 1111 .proc_handler = drop_caches_sysctl_handler, 1112 }, 1113 { 1114 .procname = "min_free_kbytes", 1115 .data = &min_free_kbytes, 1116 .maxlen = sizeof(min_free_kbytes), 1117 .mode = 0644, 1118 .proc_handler = min_free_kbytes_sysctl_handler, 1119 .extra1 = &zero, 1120 }, 1121 { 1122 .procname = "percpu_pagelist_fraction", 1123 .data = &percpu_pagelist_fraction, 1124 .maxlen = sizeof(percpu_pagelist_fraction), 1125 .mode = 0644, 1126 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1127 .extra1 = &min_percpu_pagelist_fract, 1128 }, 1129 #ifdef CONFIG_MMU 1130 { 1131 .procname = "max_map_count", 1132 .data = &sysctl_max_map_count, 1133 .maxlen = sizeof(sysctl_max_map_count), 1134 .mode = 0644, 1135 .proc_handler = proc_dointvec_minmax, 1136 .extra1 = &zero, 1137 }, 1138 #else 1139 { 1140 .procname = "nr_trim_pages", 1141 .data = &sysctl_nr_trim_pages, 1142 .maxlen = sizeof(sysctl_nr_trim_pages), 1143 .mode = 0644, 1144 .proc_handler = proc_dointvec_minmax, 1145 .extra1 = &zero, 1146 }, 1147 #endif 1148 { 1149 .procname = "laptop_mode", 1150 .data = &laptop_mode, 1151 .maxlen = sizeof(laptop_mode), 1152 .mode = 0644, 1153 .proc_handler = proc_dointvec_jiffies, 1154 }, 1155 { 1156 .procname = "block_dump", 1157 .data = &block_dump, 1158 .maxlen = sizeof(block_dump), 1159 .mode = 0644, 1160 .proc_handler = proc_dointvec, 1161 .extra1 = &zero, 1162 }, 1163 { 1164 .procname = "vfs_cache_pressure", 1165 .data = &sysctl_vfs_cache_pressure, 1166 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1167 .mode = 0644, 1168 .proc_handler = proc_dointvec, 1169 .extra1 = &zero, 1170 }, 1171 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1172 { 1173 .procname = "legacy_va_layout", 1174 .data = &sysctl_legacy_va_layout, 1175 .maxlen = sizeof(sysctl_legacy_va_layout), 1176 .mode = 0644, 1177 .proc_handler = proc_dointvec, 1178 .extra1 = &zero, 1179 }, 1180 #endif 1181 #ifdef CONFIG_NUMA 1182 { 1183 .procname = "zone_reclaim_mode", 1184 .data = &zone_reclaim_mode, 1185 .maxlen = sizeof(zone_reclaim_mode), 1186 .mode = 0644, 1187 .proc_handler = proc_dointvec, 1188 .extra1 = &zero, 1189 }, 1190 { 1191 .procname = "min_unmapped_ratio", 1192 .data = &sysctl_min_unmapped_ratio, 1193 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1194 .mode = 0644, 1195 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1196 .extra1 = &zero, 1197 .extra2 = &one_hundred, 1198 }, 1199 { 1200 .procname = "min_slab_ratio", 1201 .data = &sysctl_min_slab_ratio, 1202 .maxlen = sizeof(sysctl_min_slab_ratio), 1203 .mode = 0644, 1204 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1205 .extra1 = &zero, 1206 .extra2 = &one_hundred, 1207 }, 1208 #endif 1209 #ifdef CONFIG_SMP 1210 { 1211 .procname = "stat_interval", 1212 .data = &sysctl_stat_interval, 1213 .maxlen = sizeof(sysctl_stat_interval), 1214 .mode = 0644, 1215 .proc_handler = proc_dointvec_jiffies, 1216 }, 1217 #endif 1218 #ifdef CONFIG_MMU 1219 { 1220 .procname = "mmap_min_addr", 1221 .data = &dac_mmap_min_addr, 1222 .maxlen = sizeof(unsigned long), 1223 .mode = 0644, 1224 .proc_handler = mmap_min_addr_handler, 1225 }, 1226 #endif 1227 #ifdef CONFIG_NUMA 1228 { 1229 .procname = "numa_zonelist_order", 1230 .data = &numa_zonelist_order, 1231 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1232 .mode = 0644, 1233 .proc_handler = numa_zonelist_order_handler, 1234 }, 1235 #endif 1236 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1237 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1238 { 1239 .procname = "vdso_enabled", 1240 .data = &vdso_enabled, 1241 .maxlen = sizeof(vdso_enabled), 1242 .mode = 0644, 1243 .proc_handler = proc_dointvec, 1244 .extra1 = &zero, 1245 }, 1246 #endif 1247 #ifdef CONFIG_HIGHMEM 1248 { 1249 .procname = "highmem_is_dirtyable", 1250 .data = &vm_highmem_is_dirtyable, 1251 .maxlen = sizeof(vm_highmem_is_dirtyable), 1252 .mode = 0644, 1253 .proc_handler = proc_dointvec_minmax, 1254 .extra1 = &zero, 1255 .extra2 = &one, 1256 }, 1257 #endif 1258 { 1259 .procname = "scan_unevictable_pages", 1260 .data = &scan_unevictable_pages, 1261 .maxlen = sizeof(scan_unevictable_pages), 1262 .mode = 0644, 1263 .proc_handler = scan_unevictable_handler, 1264 }, 1265 #ifdef CONFIG_MEMORY_FAILURE 1266 { 1267 .procname = "memory_failure_early_kill", 1268 .data = &sysctl_memory_failure_early_kill, 1269 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1270 .mode = 0644, 1271 .proc_handler = proc_dointvec_minmax, 1272 .extra1 = &zero, 1273 .extra2 = &one, 1274 }, 1275 { 1276 .procname = "memory_failure_recovery", 1277 .data = &sysctl_memory_failure_recovery, 1278 .maxlen = sizeof(sysctl_memory_failure_recovery), 1279 .mode = 0644, 1280 .proc_handler = proc_dointvec_minmax, 1281 .extra1 = &zero, 1282 .extra2 = &one, 1283 }, 1284 #endif 1285 1286 /* 1287 * NOTE: do not add new entries to this table unless you have read 1288 * Documentation/sysctl/ctl_unnumbered.txt 1289 */ 1290 { } 1291 }; 1292 1293 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1294 static struct ctl_table binfmt_misc_table[] = { 1295 { } 1296 }; 1297 #endif 1298 1299 static struct ctl_table fs_table[] = { 1300 { 1301 .procname = "inode-nr", 1302 .data = &inodes_stat, 1303 .maxlen = 2*sizeof(int), 1304 .mode = 0444, 1305 .proc_handler = proc_dointvec, 1306 }, 1307 { 1308 .procname = "inode-state", 1309 .data = &inodes_stat, 1310 .maxlen = 7*sizeof(int), 1311 .mode = 0444, 1312 .proc_handler = proc_dointvec, 1313 }, 1314 { 1315 .procname = "file-nr", 1316 .data = &files_stat, 1317 .maxlen = 3*sizeof(int), 1318 .mode = 0444, 1319 .proc_handler = proc_nr_files, 1320 }, 1321 { 1322 .procname = "file-max", 1323 .data = &files_stat.max_files, 1324 .maxlen = sizeof(int), 1325 .mode = 0644, 1326 .proc_handler = proc_dointvec, 1327 }, 1328 { 1329 .procname = "nr_open", 1330 .data = &sysctl_nr_open, 1331 .maxlen = sizeof(int), 1332 .mode = 0644, 1333 .proc_handler = proc_dointvec_minmax, 1334 .extra1 = &sysctl_nr_open_min, 1335 .extra2 = &sysctl_nr_open_max, 1336 }, 1337 { 1338 .procname = "dentry-state", 1339 .data = &dentry_stat, 1340 .maxlen = 6*sizeof(int), 1341 .mode = 0444, 1342 .proc_handler = proc_dointvec, 1343 }, 1344 { 1345 .procname = "overflowuid", 1346 .data = &fs_overflowuid, 1347 .maxlen = sizeof(int), 1348 .mode = 0644, 1349 .proc_handler = proc_dointvec_minmax, 1350 .extra1 = &minolduid, 1351 .extra2 = &maxolduid, 1352 }, 1353 { 1354 .procname = "overflowgid", 1355 .data = &fs_overflowgid, 1356 .maxlen = sizeof(int), 1357 .mode = 0644, 1358 .proc_handler = proc_dointvec_minmax, 1359 .extra1 = &minolduid, 1360 .extra2 = &maxolduid, 1361 }, 1362 #ifdef CONFIG_FILE_LOCKING 1363 { 1364 .procname = "leases-enable", 1365 .data = &leases_enable, 1366 .maxlen = sizeof(int), 1367 .mode = 0644, 1368 .proc_handler = proc_dointvec, 1369 }, 1370 #endif 1371 #ifdef CONFIG_DNOTIFY 1372 { 1373 .procname = "dir-notify-enable", 1374 .data = &dir_notify_enable, 1375 .maxlen = sizeof(int), 1376 .mode = 0644, 1377 .proc_handler = proc_dointvec, 1378 }, 1379 #endif 1380 #ifdef CONFIG_MMU 1381 #ifdef CONFIG_FILE_LOCKING 1382 { 1383 .procname = "lease-break-time", 1384 .data = &lease_break_time, 1385 .maxlen = sizeof(int), 1386 .mode = 0644, 1387 .proc_handler = proc_dointvec, 1388 }, 1389 #endif 1390 #ifdef CONFIG_AIO 1391 { 1392 .procname = "aio-nr", 1393 .data = &aio_nr, 1394 .maxlen = sizeof(aio_nr), 1395 .mode = 0444, 1396 .proc_handler = proc_doulongvec_minmax, 1397 }, 1398 { 1399 .procname = "aio-max-nr", 1400 .data = &aio_max_nr, 1401 .maxlen = sizeof(aio_max_nr), 1402 .mode = 0644, 1403 .proc_handler = proc_doulongvec_minmax, 1404 }, 1405 #endif /* CONFIG_AIO */ 1406 #ifdef CONFIG_INOTIFY_USER 1407 { 1408 .procname = "inotify", 1409 .mode = 0555, 1410 .child = inotify_table, 1411 }, 1412 #endif 1413 #ifdef CONFIG_EPOLL 1414 { 1415 .procname = "epoll", 1416 .mode = 0555, 1417 .child = epoll_table, 1418 }, 1419 #endif 1420 #endif 1421 { 1422 .procname = "suid_dumpable", 1423 .data = &suid_dumpable, 1424 .maxlen = sizeof(int), 1425 .mode = 0644, 1426 .proc_handler = proc_dointvec_minmax, 1427 .extra1 = &zero, 1428 .extra2 = &two, 1429 }, 1430 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1431 { 1432 .procname = "binfmt_misc", 1433 .mode = 0555, 1434 .child = binfmt_misc_table, 1435 }, 1436 #endif 1437 /* 1438 * NOTE: do not add new entries to this table unless you have read 1439 * Documentation/sysctl/ctl_unnumbered.txt 1440 */ 1441 { } 1442 }; 1443 1444 static struct ctl_table debug_table[] = { 1445 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) 1446 { 1447 .procname = "exception-trace", 1448 .data = &show_unhandled_signals, 1449 .maxlen = sizeof(int), 1450 .mode = 0644, 1451 .proc_handler = proc_dointvec 1452 }, 1453 #endif 1454 #if defined(CONFIG_OPTPROBES) 1455 { 1456 .procname = "kprobes-optimization", 1457 .data = &sysctl_kprobes_optimization, 1458 .maxlen = sizeof(int), 1459 .mode = 0644, 1460 .proc_handler = proc_kprobes_optimization_handler, 1461 .extra1 = &zero, 1462 .extra2 = &one, 1463 }, 1464 #endif 1465 { } 1466 }; 1467 1468 static struct ctl_table dev_table[] = { 1469 { } 1470 }; 1471 1472 static DEFINE_SPINLOCK(sysctl_lock); 1473 1474 /* called under sysctl_lock */ 1475 static int use_table(struct ctl_table_header *p) 1476 { 1477 if (unlikely(p->unregistering)) 1478 return 0; 1479 p->used++; 1480 return 1; 1481 } 1482 1483 /* called under sysctl_lock */ 1484 static void unuse_table(struct ctl_table_header *p) 1485 { 1486 if (!--p->used) 1487 if (unlikely(p->unregistering)) 1488 complete(p->unregistering); 1489 } 1490 1491 /* called under sysctl_lock, will reacquire if has to wait */ 1492 static void start_unregistering(struct ctl_table_header *p) 1493 { 1494 /* 1495 * if p->used is 0, nobody will ever touch that entry again; 1496 * we'll eliminate all paths to it before dropping sysctl_lock 1497 */ 1498 if (unlikely(p->used)) { 1499 struct completion wait; 1500 init_completion(&wait); 1501 p->unregistering = &wait; 1502 spin_unlock(&sysctl_lock); 1503 wait_for_completion(&wait); 1504 spin_lock(&sysctl_lock); 1505 } else { 1506 /* anything non-NULL; we'll never dereference it */ 1507 p->unregistering = ERR_PTR(-EINVAL); 1508 } 1509 /* 1510 * do not remove from the list until nobody holds it; walking the 1511 * list in do_sysctl() relies on that. 1512 */ 1513 list_del_init(&p->ctl_entry); 1514 } 1515 1516 void sysctl_head_get(struct ctl_table_header *head) 1517 { 1518 spin_lock(&sysctl_lock); 1519 head->count++; 1520 spin_unlock(&sysctl_lock); 1521 } 1522 1523 void sysctl_head_put(struct ctl_table_header *head) 1524 { 1525 spin_lock(&sysctl_lock); 1526 if (!--head->count) 1527 kfree(head); 1528 spin_unlock(&sysctl_lock); 1529 } 1530 1531 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1532 { 1533 if (!head) 1534 BUG(); 1535 spin_lock(&sysctl_lock); 1536 if (!use_table(head)) 1537 head = ERR_PTR(-ENOENT); 1538 spin_unlock(&sysctl_lock); 1539 return head; 1540 } 1541 1542 void sysctl_head_finish(struct ctl_table_header *head) 1543 { 1544 if (!head) 1545 return; 1546 spin_lock(&sysctl_lock); 1547 unuse_table(head); 1548 spin_unlock(&sysctl_lock); 1549 } 1550 1551 static struct ctl_table_set * 1552 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1553 { 1554 struct ctl_table_set *set = &root->default_set; 1555 if (root->lookup) 1556 set = root->lookup(root, namespaces); 1557 return set; 1558 } 1559 1560 static struct list_head * 1561 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1562 { 1563 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1564 return &set->list; 1565 } 1566 1567 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1568 struct ctl_table_header *prev) 1569 { 1570 struct ctl_table_root *root; 1571 struct list_head *header_list; 1572 struct ctl_table_header *head; 1573 struct list_head *tmp; 1574 1575 spin_lock(&sysctl_lock); 1576 if (prev) { 1577 head = prev; 1578 tmp = &prev->ctl_entry; 1579 unuse_table(prev); 1580 goto next; 1581 } 1582 tmp = &root_table_header.ctl_entry; 1583 for (;;) { 1584 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1585 1586 if (!use_table(head)) 1587 goto next; 1588 spin_unlock(&sysctl_lock); 1589 return head; 1590 next: 1591 root = head->root; 1592 tmp = tmp->next; 1593 header_list = lookup_header_list(root, namespaces); 1594 if (tmp != header_list) 1595 continue; 1596 1597 do { 1598 root = list_entry(root->root_list.next, 1599 struct ctl_table_root, root_list); 1600 if (root == &sysctl_table_root) 1601 goto out; 1602 header_list = lookup_header_list(root, namespaces); 1603 } while (list_empty(header_list)); 1604 tmp = header_list->next; 1605 } 1606 out: 1607 spin_unlock(&sysctl_lock); 1608 return NULL; 1609 } 1610 1611 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1612 { 1613 return __sysctl_head_next(current->nsproxy, prev); 1614 } 1615 1616 void register_sysctl_root(struct ctl_table_root *root) 1617 { 1618 spin_lock(&sysctl_lock); 1619 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1620 spin_unlock(&sysctl_lock); 1621 } 1622 1623 /* 1624 * sysctl_perm does NOT grant the superuser all rights automatically, because 1625 * some sysctl variables are readonly even to root. 1626 */ 1627 1628 static int test_perm(int mode, int op) 1629 { 1630 if (!current_euid()) 1631 mode >>= 6; 1632 else if (in_egroup_p(0)) 1633 mode >>= 3; 1634 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1635 return 0; 1636 return -EACCES; 1637 } 1638 1639 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1640 { 1641 int error; 1642 int mode; 1643 1644 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1645 if (error) 1646 return error; 1647 1648 if (root->permissions) 1649 mode = root->permissions(root, current->nsproxy, table); 1650 else 1651 mode = table->mode; 1652 1653 return test_perm(mode, op); 1654 } 1655 1656 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1657 { 1658 for (; table->procname; table++) { 1659 table->parent = parent; 1660 if (table->child) 1661 sysctl_set_parent(table, table->child); 1662 } 1663 } 1664 1665 static __init int sysctl_init(void) 1666 { 1667 sysctl_set_parent(NULL, root_table); 1668 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1669 { 1670 int err; 1671 err = sysctl_check_table(current->nsproxy, root_table); 1672 } 1673 #endif 1674 return 0; 1675 } 1676 1677 core_initcall(sysctl_init); 1678 1679 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1680 struct ctl_table *table) 1681 { 1682 struct ctl_table *p; 1683 const char *s = branch->procname; 1684 1685 /* branch should have named subdirectory as its first element */ 1686 if (!s || !branch->child) 1687 return NULL; 1688 1689 /* ... and nothing else */ 1690 if (branch[1].procname) 1691 return NULL; 1692 1693 /* table should contain subdirectory with the same name */ 1694 for (p = table; p->procname; p++) { 1695 if (!p->child) 1696 continue; 1697 if (p->procname && strcmp(p->procname, s) == 0) 1698 return p; 1699 } 1700 return NULL; 1701 } 1702 1703 /* see if attaching q to p would be an improvement */ 1704 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1705 { 1706 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1707 struct ctl_table *next; 1708 int is_better = 0; 1709 int not_in_parent = !p->attached_by; 1710 1711 while ((next = is_branch_in(by, to)) != NULL) { 1712 if (by == q->attached_by) 1713 is_better = 1; 1714 if (to == p->attached_by) 1715 not_in_parent = 1; 1716 by = by->child; 1717 to = next->child; 1718 } 1719 1720 if (is_better && not_in_parent) { 1721 q->attached_by = by; 1722 q->attached_to = to; 1723 q->parent = p; 1724 } 1725 } 1726 1727 /** 1728 * __register_sysctl_paths - register a sysctl hierarchy 1729 * @root: List of sysctl headers to register on 1730 * @namespaces: Data to compute which lists of sysctl entries are visible 1731 * @path: The path to the directory the sysctl table is in. 1732 * @table: the top-level table structure 1733 * 1734 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1735 * array. A completely 0 filled entry terminates the table. 1736 * 1737 * The members of the &struct ctl_table structure are used as follows: 1738 * 1739 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1740 * enter a sysctl file 1741 * 1742 * data - a pointer to data for use by proc_handler 1743 * 1744 * maxlen - the maximum size in bytes of the data 1745 * 1746 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1747 * 1748 * child - a pointer to the child sysctl table if this entry is a directory, or 1749 * %NULL. 1750 * 1751 * proc_handler - the text handler routine (described below) 1752 * 1753 * de - for internal use by the sysctl routines 1754 * 1755 * extra1, extra2 - extra pointers usable by the proc handler routines 1756 * 1757 * Leaf nodes in the sysctl tree will be represented by a single file 1758 * under /proc; non-leaf nodes will be represented by directories. 1759 * 1760 * sysctl(2) can automatically manage read and write requests through 1761 * the sysctl table. The data and maxlen fields of the ctl_table 1762 * struct enable minimal validation of the values being written to be 1763 * performed, and the mode field allows minimal authentication. 1764 * 1765 * There must be a proc_handler routine for any terminal nodes 1766 * mirrored under /proc/sys (non-terminals are handled by a built-in 1767 * directory handler). Several default handlers are available to 1768 * cover common cases - 1769 * 1770 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1771 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1772 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1773 * 1774 * It is the handler's job to read the input buffer from user memory 1775 * and process it. The handler should return 0 on success. 1776 * 1777 * This routine returns %NULL on a failure to register, and a pointer 1778 * to the table header on success. 1779 */ 1780 struct ctl_table_header *__register_sysctl_paths( 1781 struct ctl_table_root *root, 1782 struct nsproxy *namespaces, 1783 const struct ctl_path *path, struct ctl_table *table) 1784 { 1785 struct ctl_table_header *header; 1786 struct ctl_table *new, **prevp; 1787 unsigned int n, npath; 1788 struct ctl_table_set *set; 1789 1790 /* Count the path components */ 1791 for (npath = 0; path[npath].procname; ++npath) 1792 ; 1793 1794 /* 1795 * For each path component, allocate a 2-element ctl_table array. 1796 * The first array element will be filled with the sysctl entry 1797 * for this, the second will be the sentinel (procname == 0). 1798 * 1799 * We allocate everything in one go so that we don't have to 1800 * worry about freeing additional memory in unregister_sysctl_table. 1801 */ 1802 header = kzalloc(sizeof(struct ctl_table_header) + 1803 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1804 if (!header) 1805 return NULL; 1806 1807 new = (struct ctl_table *) (header + 1); 1808 1809 /* Now connect the dots */ 1810 prevp = &header->ctl_table; 1811 for (n = 0; n < npath; ++n, ++path) { 1812 /* Copy the procname */ 1813 new->procname = path->procname; 1814 new->mode = 0555; 1815 1816 *prevp = new; 1817 prevp = &new->child; 1818 1819 new += 2; 1820 } 1821 *prevp = table; 1822 header->ctl_table_arg = table; 1823 1824 INIT_LIST_HEAD(&header->ctl_entry); 1825 header->used = 0; 1826 header->unregistering = NULL; 1827 header->root = root; 1828 sysctl_set_parent(NULL, header->ctl_table); 1829 header->count = 1; 1830 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1831 if (sysctl_check_table(namespaces, header->ctl_table)) { 1832 kfree(header); 1833 return NULL; 1834 } 1835 #endif 1836 spin_lock(&sysctl_lock); 1837 header->set = lookup_header_set(root, namespaces); 1838 header->attached_by = header->ctl_table; 1839 header->attached_to = root_table; 1840 header->parent = &root_table_header; 1841 for (set = header->set; set; set = set->parent) { 1842 struct ctl_table_header *p; 1843 list_for_each_entry(p, &set->list, ctl_entry) { 1844 if (p->unregistering) 1845 continue; 1846 try_attach(p, header); 1847 } 1848 } 1849 header->parent->count++; 1850 list_add_tail(&header->ctl_entry, &header->set->list); 1851 spin_unlock(&sysctl_lock); 1852 1853 return header; 1854 } 1855 1856 /** 1857 * register_sysctl_table_path - register a sysctl table hierarchy 1858 * @path: The path to the directory the sysctl table is in. 1859 * @table: the top-level table structure 1860 * 1861 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1862 * array. A completely 0 filled entry terminates the table. 1863 * 1864 * See __register_sysctl_paths for more details. 1865 */ 1866 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1867 struct ctl_table *table) 1868 { 1869 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1870 path, table); 1871 } 1872 1873 /** 1874 * register_sysctl_table - register a sysctl table hierarchy 1875 * @table: the top-level table structure 1876 * 1877 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1878 * array. A completely 0 filled entry terminates the table. 1879 * 1880 * See register_sysctl_paths for more details. 1881 */ 1882 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1883 { 1884 static const struct ctl_path null_path[] = { {} }; 1885 1886 return register_sysctl_paths(null_path, table); 1887 } 1888 1889 /** 1890 * unregister_sysctl_table - unregister a sysctl table hierarchy 1891 * @header: the header returned from register_sysctl_table 1892 * 1893 * Unregisters the sysctl table and all children. proc entries may not 1894 * actually be removed until they are no longer used by anyone. 1895 */ 1896 void unregister_sysctl_table(struct ctl_table_header * header) 1897 { 1898 might_sleep(); 1899 1900 if (header == NULL) 1901 return; 1902 1903 spin_lock(&sysctl_lock); 1904 start_unregistering(header); 1905 if (!--header->parent->count) { 1906 WARN_ON(1); 1907 kfree(header->parent); 1908 } 1909 if (!--header->count) 1910 kfree(header); 1911 spin_unlock(&sysctl_lock); 1912 } 1913 1914 int sysctl_is_seen(struct ctl_table_header *p) 1915 { 1916 struct ctl_table_set *set = p->set; 1917 int res; 1918 spin_lock(&sysctl_lock); 1919 if (p->unregistering) 1920 res = 0; 1921 else if (!set->is_seen) 1922 res = 1; 1923 else 1924 res = set->is_seen(set); 1925 spin_unlock(&sysctl_lock); 1926 return res; 1927 } 1928 1929 void setup_sysctl_set(struct ctl_table_set *p, 1930 struct ctl_table_set *parent, 1931 int (*is_seen)(struct ctl_table_set *)) 1932 { 1933 INIT_LIST_HEAD(&p->list); 1934 p->parent = parent ? parent : &sysctl_table_root.default_set; 1935 p->is_seen = is_seen; 1936 } 1937 1938 #else /* !CONFIG_SYSCTL */ 1939 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1940 { 1941 return NULL; 1942 } 1943 1944 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1945 struct ctl_table *table) 1946 { 1947 return NULL; 1948 } 1949 1950 void unregister_sysctl_table(struct ctl_table_header * table) 1951 { 1952 } 1953 1954 void setup_sysctl_set(struct ctl_table_set *p, 1955 struct ctl_table_set *parent, 1956 int (*is_seen)(struct ctl_table_set *)) 1957 { 1958 } 1959 1960 void sysctl_head_put(struct ctl_table_header *head) 1961 { 1962 } 1963 1964 #endif /* CONFIG_SYSCTL */ 1965 1966 /* 1967 * /proc/sys support 1968 */ 1969 1970 #ifdef CONFIG_PROC_SYSCTL 1971 1972 static int _proc_do_string(void* data, int maxlen, int write, 1973 void __user *buffer, 1974 size_t *lenp, loff_t *ppos) 1975 { 1976 size_t len; 1977 char __user *p; 1978 char c; 1979 1980 if (!data || !maxlen || !*lenp) { 1981 *lenp = 0; 1982 return 0; 1983 } 1984 1985 if (write) { 1986 len = 0; 1987 p = buffer; 1988 while (len < *lenp) { 1989 if (get_user(c, p++)) 1990 return -EFAULT; 1991 if (c == 0 || c == '\n') 1992 break; 1993 len++; 1994 } 1995 if (len >= maxlen) 1996 len = maxlen-1; 1997 if(copy_from_user(data, buffer, len)) 1998 return -EFAULT; 1999 ((char *) data)[len] = 0; 2000 *ppos += *lenp; 2001 } else { 2002 len = strlen(data); 2003 if (len > maxlen) 2004 len = maxlen; 2005 2006 if (*ppos > len) { 2007 *lenp = 0; 2008 return 0; 2009 } 2010 2011 data += *ppos; 2012 len -= *ppos; 2013 2014 if (len > *lenp) 2015 len = *lenp; 2016 if (len) 2017 if(copy_to_user(buffer, data, len)) 2018 return -EFAULT; 2019 if (len < *lenp) { 2020 if(put_user('\n', ((char __user *) buffer) + len)) 2021 return -EFAULT; 2022 len++; 2023 } 2024 *lenp = len; 2025 *ppos += len; 2026 } 2027 return 0; 2028 } 2029 2030 /** 2031 * proc_dostring - read a string sysctl 2032 * @table: the sysctl table 2033 * @write: %TRUE if this is a write to the sysctl file 2034 * @buffer: the user buffer 2035 * @lenp: the size of the user buffer 2036 * @ppos: file position 2037 * 2038 * Reads/writes a string from/to the user buffer. If the kernel 2039 * buffer provided is not large enough to hold the string, the 2040 * string is truncated. The copied string is %NULL-terminated. 2041 * If the string is being read by the user process, it is copied 2042 * and a newline '\n' is added. It is truncated if the buffer is 2043 * not large enough. 2044 * 2045 * Returns 0 on success. 2046 */ 2047 int proc_dostring(struct ctl_table *table, int write, 2048 void __user *buffer, size_t *lenp, loff_t *ppos) 2049 { 2050 return _proc_do_string(table->data, table->maxlen, write, 2051 buffer, lenp, ppos); 2052 } 2053 2054 2055 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 2056 int *valp, 2057 int write, void *data) 2058 { 2059 if (write) { 2060 *valp = *negp ? -*lvalp : *lvalp; 2061 } else { 2062 int val = *valp; 2063 if (val < 0) { 2064 *negp = -1; 2065 *lvalp = (unsigned long)-val; 2066 } else { 2067 *negp = 0; 2068 *lvalp = (unsigned long)val; 2069 } 2070 } 2071 return 0; 2072 } 2073 2074 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2075 int write, void __user *buffer, 2076 size_t *lenp, loff_t *ppos, 2077 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2078 int write, void *data), 2079 void *data) 2080 { 2081 #define TMPBUFLEN 21 2082 int *i, vleft, first = 1, neg; 2083 unsigned long lval; 2084 size_t left, len; 2085 2086 char buf[TMPBUFLEN], *p; 2087 char __user *s = buffer; 2088 2089 if (!tbl_data || !table->maxlen || !*lenp || 2090 (*ppos && !write)) { 2091 *lenp = 0; 2092 return 0; 2093 } 2094 2095 i = (int *) tbl_data; 2096 vleft = table->maxlen / sizeof(*i); 2097 left = *lenp; 2098 2099 if (!conv) 2100 conv = do_proc_dointvec_conv; 2101 2102 for (; left && vleft--; i++, first=0) { 2103 if (write) { 2104 while (left) { 2105 char c; 2106 if (get_user(c, s)) 2107 return -EFAULT; 2108 if (!isspace(c)) 2109 break; 2110 left--; 2111 s++; 2112 } 2113 if (!left) 2114 break; 2115 neg = 0; 2116 len = left; 2117 if (len > sizeof(buf) - 1) 2118 len = sizeof(buf) - 1; 2119 if (copy_from_user(buf, s, len)) 2120 return -EFAULT; 2121 buf[len] = 0; 2122 p = buf; 2123 if (*p == '-' && left > 1) { 2124 neg = 1; 2125 p++; 2126 } 2127 if (*p < '0' || *p > '9') 2128 break; 2129 2130 lval = simple_strtoul(p, &p, 0); 2131 2132 len = p-buf; 2133 if ((len < left) && *p && !isspace(*p)) 2134 break; 2135 s += len; 2136 left -= len; 2137 2138 if (conv(&neg, &lval, i, 1, data)) 2139 break; 2140 } else { 2141 p = buf; 2142 if (!first) 2143 *p++ = '\t'; 2144 2145 if (conv(&neg, &lval, i, 0, data)) 2146 break; 2147 2148 sprintf(p, "%s%lu", neg ? "-" : "", lval); 2149 len = strlen(buf); 2150 if (len > left) 2151 len = left; 2152 if(copy_to_user(s, buf, len)) 2153 return -EFAULT; 2154 left -= len; 2155 s += len; 2156 } 2157 } 2158 2159 if (!write && !first && left) { 2160 if(put_user('\n', s)) 2161 return -EFAULT; 2162 left--, s++; 2163 } 2164 if (write) { 2165 while (left) { 2166 char c; 2167 if (get_user(c, s++)) 2168 return -EFAULT; 2169 if (!isspace(c)) 2170 break; 2171 left--; 2172 } 2173 } 2174 if (write && first) 2175 return -EINVAL; 2176 *lenp -= left; 2177 *ppos += *lenp; 2178 return 0; 2179 #undef TMPBUFLEN 2180 } 2181 2182 static int do_proc_dointvec(struct ctl_table *table, int write, 2183 void __user *buffer, size_t *lenp, loff_t *ppos, 2184 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2185 int write, void *data), 2186 void *data) 2187 { 2188 return __do_proc_dointvec(table->data, table, write, 2189 buffer, lenp, ppos, conv, data); 2190 } 2191 2192 /** 2193 * proc_dointvec - read a vector of integers 2194 * @table: the sysctl table 2195 * @write: %TRUE if this is a write to the sysctl file 2196 * @buffer: the user buffer 2197 * @lenp: the size of the user buffer 2198 * @ppos: file position 2199 * 2200 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2201 * values from/to the user buffer, treated as an ASCII string. 2202 * 2203 * Returns 0 on success. 2204 */ 2205 int proc_dointvec(struct ctl_table *table, int write, 2206 void __user *buffer, size_t *lenp, loff_t *ppos) 2207 { 2208 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2209 NULL,NULL); 2210 } 2211 2212 /* 2213 * Taint values can only be increased 2214 * This means we can safely use a temporary. 2215 */ 2216 static int proc_taint(struct ctl_table *table, int write, 2217 void __user *buffer, size_t *lenp, loff_t *ppos) 2218 { 2219 struct ctl_table t; 2220 unsigned long tmptaint = get_taint(); 2221 int err; 2222 2223 if (write && !capable(CAP_SYS_ADMIN)) 2224 return -EPERM; 2225 2226 t = *table; 2227 t.data = &tmptaint; 2228 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2229 if (err < 0) 2230 return err; 2231 2232 if (write) { 2233 /* 2234 * Poor man's atomic or. Not worth adding a primitive 2235 * to everyone's atomic.h for this 2236 */ 2237 int i; 2238 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2239 if ((tmptaint >> i) & 1) 2240 add_taint(i); 2241 } 2242 } 2243 2244 return err; 2245 } 2246 2247 struct do_proc_dointvec_minmax_conv_param { 2248 int *min; 2249 int *max; 2250 }; 2251 2252 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 2253 int *valp, 2254 int write, void *data) 2255 { 2256 struct do_proc_dointvec_minmax_conv_param *param = data; 2257 if (write) { 2258 int val = *negp ? -*lvalp : *lvalp; 2259 if ((param->min && *param->min > val) || 2260 (param->max && *param->max < val)) 2261 return -EINVAL; 2262 *valp = val; 2263 } else { 2264 int val = *valp; 2265 if (val < 0) { 2266 *negp = -1; 2267 *lvalp = (unsigned long)-val; 2268 } else { 2269 *negp = 0; 2270 *lvalp = (unsigned long)val; 2271 } 2272 } 2273 return 0; 2274 } 2275 2276 /** 2277 * proc_dointvec_minmax - read a vector of integers with min/max values 2278 * @table: the sysctl table 2279 * @write: %TRUE if this is a write to the sysctl file 2280 * @buffer: the user buffer 2281 * @lenp: the size of the user buffer 2282 * @ppos: file position 2283 * 2284 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2285 * values from/to the user buffer, treated as an ASCII string. 2286 * 2287 * This routine will ensure the values are within the range specified by 2288 * table->extra1 (min) and table->extra2 (max). 2289 * 2290 * Returns 0 on success. 2291 */ 2292 int proc_dointvec_minmax(struct ctl_table *table, int write, 2293 void __user *buffer, size_t *lenp, loff_t *ppos) 2294 { 2295 struct do_proc_dointvec_minmax_conv_param param = { 2296 .min = (int *) table->extra1, 2297 .max = (int *) table->extra2, 2298 }; 2299 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2300 do_proc_dointvec_minmax_conv, ¶m); 2301 } 2302 2303 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2304 void __user *buffer, 2305 size_t *lenp, loff_t *ppos, 2306 unsigned long convmul, 2307 unsigned long convdiv) 2308 { 2309 #define TMPBUFLEN 21 2310 unsigned long *i, *min, *max, val; 2311 int vleft, first=1, neg; 2312 size_t len, left; 2313 char buf[TMPBUFLEN], *p; 2314 char __user *s = buffer; 2315 2316 if (!data || !table->maxlen || !*lenp || 2317 (*ppos && !write)) { 2318 *lenp = 0; 2319 return 0; 2320 } 2321 2322 i = (unsigned long *) data; 2323 min = (unsigned long *) table->extra1; 2324 max = (unsigned long *) table->extra2; 2325 vleft = table->maxlen / sizeof(unsigned long); 2326 left = *lenp; 2327 2328 for (; left && vleft--; i++, min++, max++, first=0) { 2329 if (write) { 2330 while (left) { 2331 char c; 2332 if (get_user(c, s)) 2333 return -EFAULT; 2334 if (!isspace(c)) 2335 break; 2336 left--; 2337 s++; 2338 } 2339 if (!left) 2340 break; 2341 neg = 0; 2342 len = left; 2343 if (len > TMPBUFLEN-1) 2344 len = TMPBUFLEN-1; 2345 if (copy_from_user(buf, s, len)) 2346 return -EFAULT; 2347 buf[len] = 0; 2348 p = buf; 2349 if (*p == '-' && left > 1) { 2350 neg = 1; 2351 p++; 2352 } 2353 if (*p < '0' || *p > '9') 2354 break; 2355 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 2356 len = p-buf; 2357 if ((len < left) && *p && !isspace(*p)) 2358 break; 2359 if (neg) 2360 val = -val; 2361 s += len; 2362 left -= len; 2363 2364 if(neg) 2365 continue; 2366 if ((min && val < *min) || (max && val > *max)) 2367 continue; 2368 *i = val; 2369 } else { 2370 p = buf; 2371 if (!first) 2372 *p++ = '\t'; 2373 sprintf(p, "%lu", convdiv * (*i) / convmul); 2374 len = strlen(buf); 2375 if (len > left) 2376 len = left; 2377 if(copy_to_user(s, buf, len)) 2378 return -EFAULT; 2379 left -= len; 2380 s += len; 2381 } 2382 } 2383 2384 if (!write && !first && left) { 2385 if(put_user('\n', s)) 2386 return -EFAULT; 2387 left--, s++; 2388 } 2389 if (write) { 2390 while (left) { 2391 char c; 2392 if (get_user(c, s++)) 2393 return -EFAULT; 2394 if (!isspace(c)) 2395 break; 2396 left--; 2397 } 2398 } 2399 if (write && first) 2400 return -EINVAL; 2401 *lenp -= left; 2402 *ppos += *lenp; 2403 return 0; 2404 #undef TMPBUFLEN 2405 } 2406 2407 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2408 void __user *buffer, 2409 size_t *lenp, loff_t *ppos, 2410 unsigned long convmul, 2411 unsigned long convdiv) 2412 { 2413 return __do_proc_doulongvec_minmax(table->data, table, write, 2414 buffer, lenp, ppos, convmul, convdiv); 2415 } 2416 2417 /** 2418 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2419 * @table: the sysctl table 2420 * @write: %TRUE if this is a write to the sysctl file 2421 * @buffer: the user buffer 2422 * @lenp: the size of the user buffer 2423 * @ppos: file position 2424 * 2425 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2426 * values from/to the user buffer, treated as an ASCII string. 2427 * 2428 * This routine will ensure the values are within the range specified by 2429 * table->extra1 (min) and table->extra2 (max). 2430 * 2431 * Returns 0 on success. 2432 */ 2433 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2434 void __user *buffer, size_t *lenp, loff_t *ppos) 2435 { 2436 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2437 } 2438 2439 /** 2440 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2441 * @table: the sysctl table 2442 * @write: %TRUE if this is a write to the sysctl file 2443 * @buffer: the user buffer 2444 * @lenp: the size of the user buffer 2445 * @ppos: file position 2446 * 2447 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2448 * values from/to the user buffer, treated as an ASCII string. The values 2449 * are treated as milliseconds, and converted to jiffies when they are stored. 2450 * 2451 * This routine will ensure the values are within the range specified by 2452 * table->extra1 (min) and table->extra2 (max). 2453 * 2454 * Returns 0 on success. 2455 */ 2456 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2457 void __user *buffer, 2458 size_t *lenp, loff_t *ppos) 2459 { 2460 return do_proc_doulongvec_minmax(table, write, buffer, 2461 lenp, ppos, HZ, 1000l); 2462 } 2463 2464 2465 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2466 int *valp, 2467 int write, void *data) 2468 { 2469 if (write) { 2470 if (*lvalp > LONG_MAX / HZ) 2471 return 1; 2472 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2473 } else { 2474 int val = *valp; 2475 unsigned long lval; 2476 if (val < 0) { 2477 *negp = -1; 2478 lval = (unsigned long)-val; 2479 } else { 2480 *negp = 0; 2481 lval = (unsigned long)val; 2482 } 2483 *lvalp = lval / HZ; 2484 } 2485 return 0; 2486 } 2487 2488 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2489 int *valp, 2490 int write, void *data) 2491 { 2492 if (write) { 2493 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2494 return 1; 2495 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2496 } else { 2497 int val = *valp; 2498 unsigned long lval; 2499 if (val < 0) { 2500 *negp = -1; 2501 lval = (unsigned long)-val; 2502 } else { 2503 *negp = 0; 2504 lval = (unsigned long)val; 2505 } 2506 *lvalp = jiffies_to_clock_t(lval); 2507 } 2508 return 0; 2509 } 2510 2511 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2512 int *valp, 2513 int write, void *data) 2514 { 2515 if (write) { 2516 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2517 } else { 2518 int val = *valp; 2519 unsigned long lval; 2520 if (val < 0) { 2521 *negp = -1; 2522 lval = (unsigned long)-val; 2523 } else { 2524 *negp = 0; 2525 lval = (unsigned long)val; 2526 } 2527 *lvalp = jiffies_to_msecs(lval); 2528 } 2529 return 0; 2530 } 2531 2532 /** 2533 * proc_dointvec_jiffies - read a vector of integers as seconds 2534 * @table: the sysctl table 2535 * @write: %TRUE if this is a write to the sysctl file 2536 * @buffer: the user buffer 2537 * @lenp: the size of the user buffer 2538 * @ppos: file position 2539 * 2540 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2541 * values from/to the user buffer, treated as an ASCII string. 2542 * The values read are assumed to be in seconds, and are converted into 2543 * jiffies. 2544 * 2545 * Returns 0 on success. 2546 */ 2547 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2548 void __user *buffer, size_t *lenp, loff_t *ppos) 2549 { 2550 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2551 do_proc_dointvec_jiffies_conv,NULL); 2552 } 2553 2554 /** 2555 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2556 * @table: the sysctl table 2557 * @write: %TRUE if this is a write to the sysctl file 2558 * @buffer: the user buffer 2559 * @lenp: the size of the user buffer 2560 * @ppos: pointer to the file position 2561 * 2562 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2563 * values from/to the user buffer, treated as an ASCII string. 2564 * The values read are assumed to be in 1/USER_HZ seconds, and 2565 * are converted into jiffies. 2566 * 2567 * Returns 0 on success. 2568 */ 2569 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2570 void __user *buffer, size_t *lenp, loff_t *ppos) 2571 { 2572 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2573 do_proc_dointvec_userhz_jiffies_conv,NULL); 2574 } 2575 2576 /** 2577 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2578 * @table: the sysctl table 2579 * @write: %TRUE if this is a write to the sysctl file 2580 * @buffer: the user buffer 2581 * @lenp: the size of the user buffer 2582 * @ppos: file position 2583 * @ppos: the current position in the file 2584 * 2585 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2586 * values from/to the user buffer, treated as an ASCII string. 2587 * The values read are assumed to be in 1/1000 seconds, and 2588 * are converted into jiffies. 2589 * 2590 * Returns 0 on success. 2591 */ 2592 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2593 void __user *buffer, size_t *lenp, loff_t *ppos) 2594 { 2595 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2596 do_proc_dointvec_ms_jiffies_conv, NULL); 2597 } 2598 2599 static int proc_do_cad_pid(struct ctl_table *table, int write, 2600 void __user *buffer, size_t *lenp, loff_t *ppos) 2601 { 2602 struct pid *new_pid; 2603 pid_t tmp; 2604 int r; 2605 2606 tmp = pid_vnr(cad_pid); 2607 2608 r = __do_proc_dointvec(&tmp, table, write, buffer, 2609 lenp, ppos, NULL, NULL); 2610 if (r || !write) 2611 return r; 2612 2613 new_pid = find_get_pid(tmp); 2614 if (!new_pid) 2615 return -ESRCH; 2616 2617 put_pid(xchg(&cad_pid, new_pid)); 2618 return 0; 2619 } 2620 2621 #else /* CONFIG_PROC_FS */ 2622 2623 int proc_dostring(struct ctl_table *table, int write, 2624 void __user *buffer, size_t *lenp, loff_t *ppos) 2625 { 2626 return -ENOSYS; 2627 } 2628 2629 int proc_dointvec(struct ctl_table *table, int write, 2630 void __user *buffer, size_t *lenp, loff_t *ppos) 2631 { 2632 return -ENOSYS; 2633 } 2634 2635 int proc_dointvec_minmax(struct ctl_table *table, int write, 2636 void __user *buffer, size_t *lenp, loff_t *ppos) 2637 { 2638 return -ENOSYS; 2639 } 2640 2641 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2642 void __user *buffer, size_t *lenp, loff_t *ppos) 2643 { 2644 return -ENOSYS; 2645 } 2646 2647 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2648 void __user *buffer, size_t *lenp, loff_t *ppos) 2649 { 2650 return -ENOSYS; 2651 } 2652 2653 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2654 void __user *buffer, size_t *lenp, loff_t *ppos) 2655 { 2656 return -ENOSYS; 2657 } 2658 2659 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2660 void __user *buffer, size_t *lenp, loff_t *ppos) 2661 { 2662 return -ENOSYS; 2663 } 2664 2665 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2666 void __user *buffer, 2667 size_t *lenp, loff_t *ppos) 2668 { 2669 return -ENOSYS; 2670 } 2671 2672 2673 #endif /* CONFIG_PROC_FS */ 2674 2675 /* 2676 * No sense putting this after each symbol definition, twice, 2677 * exception granted :-) 2678 */ 2679 EXPORT_SYMBOL(proc_dointvec); 2680 EXPORT_SYMBOL(proc_dointvec_jiffies); 2681 EXPORT_SYMBOL(proc_dointvec_minmax); 2682 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2683 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2684 EXPORT_SYMBOL(proc_dostring); 2685 EXPORT_SYMBOL(proc_doulongvec_minmax); 2686 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2687 EXPORT_SYMBOL(register_sysctl_table); 2688 EXPORT_SYMBOL(register_sysctl_paths); 2689 EXPORT_SYMBOL(unregister_sysctl_table); 2690