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/signal.h> 27 #include <linux/proc_fs.h> 28 #include <linux/security.h> 29 #include <linux/ctype.h> 30 #include <linux/kmemcheck.h> 31 #include <linux/fs.h> 32 #include <linux/init.h> 33 #include <linux/kernel.h> 34 #include <linux/kobject.h> 35 #include <linux/net.h> 36 #include <linux/sysrq.h> 37 #include <linux/highuid.h> 38 #include <linux/writeback.h> 39 #include <linux/ratelimit.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_event.h> 54 #include <linux/kprobes.h> 55 #include <linux/pipe_fs_i.h> 56 57 #include <asm/uaccess.h> 58 #include <asm/processor.h> 59 60 #ifdef CONFIG_X86 61 #include <asm/nmi.h> 62 #include <asm/stacktrace.h> 63 #include <asm/io.h> 64 #endif 65 #ifdef CONFIG_BSD_PROCESS_ACCT 66 #include <linux/acct.h> 67 #endif 68 #ifdef CONFIG_RT_MUTEXES 69 #include <linux/rtmutex.h> 70 #endif 71 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 72 #include <linux/lockdep.h> 73 #endif 74 #ifdef CONFIG_CHR_DEV_SG 75 #include <scsi/sg.h> 76 #endif 77 78 79 #if defined(CONFIG_SYSCTL) 80 81 /* External variables not in a header file. */ 82 extern int sysctl_overcommit_memory; 83 extern int sysctl_overcommit_ratio; 84 extern int sysctl_panic_on_oom; 85 extern int sysctl_oom_kill_allocating_task; 86 extern int sysctl_oom_dump_tasks; 87 extern int max_threads; 88 extern int core_uses_pid; 89 extern int suid_dumpable; 90 extern char core_pattern[]; 91 extern unsigned int core_pipe_limit; 92 extern int pid_max; 93 extern int min_free_kbytes; 94 extern int pid_max_min, pid_max_max; 95 extern int sysctl_drop_caches; 96 extern int percpu_pagelist_fraction; 97 extern int compat_log; 98 extern int latencytop_enabled; 99 extern int sysctl_nr_open_min, sysctl_nr_open_max; 100 #ifndef CONFIG_MMU 101 extern int sysctl_nr_trim_pages; 102 #endif 103 #ifdef CONFIG_BLOCK 104 extern int blk_iopoll_enabled; 105 #endif 106 107 /* Constants used for minimum and maximum */ 108 #ifdef CONFIG_DETECT_SOFTLOCKUP 109 static int sixty = 60; 110 static int neg_one = -1; 111 #endif 112 113 static int zero; 114 static int __maybe_unused one = 1; 115 static int __maybe_unused two = 2; 116 static unsigned long one_ul = 1; 117 static int one_hundred = 100; 118 #ifdef CONFIG_PRINTK 119 static int ten_thousand = 10000; 120 #endif 121 122 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 123 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 124 125 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 126 static int maxolduid = 65535; 127 static int minolduid; 128 static int min_percpu_pagelist_fract = 8; 129 130 static int ngroups_max = NGROUPS_MAX; 131 132 #ifdef CONFIG_SPARC 133 #include <asm/system.h> 134 #endif 135 136 #ifdef CONFIG_SPARC64 137 extern int sysctl_tsb_ratio; 138 #endif 139 140 #ifdef __hppa__ 141 extern int pwrsw_enabled; 142 extern int unaligned_enabled; 143 #endif 144 145 #ifdef CONFIG_S390 146 #ifdef CONFIG_MATHEMU 147 extern int sysctl_ieee_emulation_warnings; 148 #endif 149 extern int sysctl_userprocess_debug; 150 extern int spin_retry; 151 #endif 152 153 #ifdef CONFIG_IA64 154 extern int no_unaligned_warning; 155 extern int unaligned_dump_stack; 156 #endif 157 158 extern struct ratelimit_state printk_ratelimit_state; 159 160 #ifdef CONFIG_PROC_SYSCTL 161 static int proc_do_cad_pid(struct ctl_table *table, int write, 162 void __user *buffer, size_t *lenp, loff_t *ppos); 163 static int proc_taint(struct ctl_table *table, int write, 164 void __user *buffer, size_t *lenp, loff_t *ppos); 165 #endif 166 167 #ifdef CONFIG_MAGIC_SYSRQ 168 static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */ 169 170 static int sysrq_sysctl_handler(ctl_table *table, int write, 171 void __user *buffer, size_t *lenp, 172 loff_t *ppos) 173 { 174 int error; 175 176 error = proc_dointvec(table, write, buffer, lenp, ppos); 177 if (error) 178 return error; 179 180 if (write) 181 sysrq_toggle_support(__sysrq_enabled); 182 183 return 0; 184 } 185 186 #endif 187 188 static struct ctl_table root_table[]; 189 static struct ctl_table_root sysctl_table_root; 190 static struct ctl_table_header root_table_header = { 191 .count = 1, 192 .ctl_table = root_table, 193 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 194 .root = &sysctl_table_root, 195 .set = &sysctl_table_root.default_set, 196 }; 197 static struct ctl_table_root sysctl_table_root = { 198 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 199 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 200 }; 201 202 static struct ctl_table kern_table[]; 203 static struct ctl_table vm_table[]; 204 static struct ctl_table fs_table[]; 205 static struct ctl_table debug_table[]; 206 static struct ctl_table dev_table[]; 207 extern struct ctl_table random_table[]; 208 #ifdef CONFIG_INOTIFY_USER 209 extern struct ctl_table inotify_table[]; 210 #endif 211 #ifdef CONFIG_EPOLL 212 extern struct ctl_table epoll_table[]; 213 #endif 214 215 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 216 int sysctl_legacy_va_layout; 217 #endif 218 219 /* The default sysctl tables: */ 220 221 static struct ctl_table root_table[] = { 222 { 223 .procname = "kernel", 224 .mode = 0555, 225 .child = kern_table, 226 }, 227 { 228 .procname = "vm", 229 .mode = 0555, 230 .child = vm_table, 231 }, 232 { 233 .procname = "fs", 234 .mode = 0555, 235 .child = fs_table, 236 }, 237 { 238 .procname = "debug", 239 .mode = 0555, 240 .child = debug_table, 241 }, 242 { 243 .procname = "dev", 244 .mode = 0555, 245 .child = dev_table, 246 }, 247 /* 248 * NOTE: do not add new entries to this table unless you have read 249 * Documentation/sysctl/ctl_unnumbered.txt 250 */ 251 { } 252 }; 253 254 #ifdef CONFIG_SCHED_DEBUG 255 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 256 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 257 static int min_wakeup_granularity_ns; /* 0 usecs */ 258 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 259 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 260 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 261 static int min_sched_shares_ratelimit = 100000; /* 100 usec */ 262 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */ 263 #endif 264 265 static struct ctl_table kern_table[] = { 266 { 267 .procname = "sched_child_runs_first", 268 .data = &sysctl_sched_child_runs_first, 269 .maxlen = sizeof(unsigned int), 270 .mode = 0644, 271 .proc_handler = proc_dointvec, 272 }, 273 #ifdef CONFIG_SCHED_DEBUG 274 { 275 .procname = "sched_min_granularity_ns", 276 .data = &sysctl_sched_min_granularity, 277 .maxlen = sizeof(unsigned int), 278 .mode = 0644, 279 .proc_handler = sched_proc_update_handler, 280 .extra1 = &min_sched_granularity_ns, 281 .extra2 = &max_sched_granularity_ns, 282 }, 283 { 284 .procname = "sched_latency_ns", 285 .data = &sysctl_sched_latency, 286 .maxlen = sizeof(unsigned int), 287 .mode = 0644, 288 .proc_handler = sched_proc_update_handler, 289 .extra1 = &min_sched_granularity_ns, 290 .extra2 = &max_sched_granularity_ns, 291 }, 292 { 293 .procname = "sched_wakeup_granularity_ns", 294 .data = &sysctl_sched_wakeup_granularity, 295 .maxlen = sizeof(unsigned int), 296 .mode = 0644, 297 .proc_handler = sched_proc_update_handler, 298 .extra1 = &min_wakeup_granularity_ns, 299 .extra2 = &max_wakeup_granularity_ns, 300 }, 301 { 302 .procname = "sched_shares_ratelimit", 303 .data = &sysctl_sched_shares_ratelimit, 304 .maxlen = sizeof(unsigned int), 305 .mode = 0644, 306 .proc_handler = sched_proc_update_handler, 307 .extra1 = &min_sched_shares_ratelimit, 308 .extra2 = &max_sched_shares_ratelimit, 309 }, 310 { 311 .procname = "sched_tunable_scaling", 312 .data = &sysctl_sched_tunable_scaling, 313 .maxlen = sizeof(enum sched_tunable_scaling), 314 .mode = 0644, 315 .proc_handler = sched_proc_update_handler, 316 .extra1 = &min_sched_tunable_scaling, 317 .extra2 = &max_sched_tunable_scaling, 318 }, 319 { 320 .procname = "sched_shares_thresh", 321 .data = &sysctl_sched_shares_thresh, 322 .maxlen = sizeof(unsigned int), 323 .mode = 0644, 324 .proc_handler = proc_dointvec_minmax, 325 .extra1 = &zero, 326 }, 327 { 328 .procname = "sched_migration_cost", 329 .data = &sysctl_sched_migration_cost, 330 .maxlen = sizeof(unsigned int), 331 .mode = 0644, 332 .proc_handler = proc_dointvec, 333 }, 334 { 335 .procname = "sched_nr_migrate", 336 .data = &sysctl_sched_nr_migrate, 337 .maxlen = sizeof(unsigned int), 338 .mode = 0644, 339 .proc_handler = proc_dointvec, 340 }, 341 { 342 .procname = "sched_time_avg", 343 .data = &sysctl_sched_time_avg, 344 .maxlen = sizeof(unsigned int), 345 .mode = 0644, 346 .proc_handler = proc_dointvec, 347 }, 348 { 349 .procname = "timer_migration", 350 .data = &sysctl_timer_migration, 351 .maxlen = sizeof(unsigned int), 352 .mode = 0644, 353 .proc_handler = proc_dointvec_minmax, 354 .extra1 = &zero, 355 .extra2 = &one, 356 }, 357 #endif 358 { 359 .procname = "sched_rt_period_us", 360 .data = &sysctl_sched_rt_period, 361 .maxlen = sizeof(unsigned int), 362 .mode = 0644, 363 .proc_handler = sched_rt_handler, 364 }, 365 { 366 .procname = "sched_rt_runtime_us", 367 .data = &sysctl_sched_rt_runtime, 368 .maxlen = sizeof(int), 369 .mode = 0644, 370 .proc_handler = sched_rt_handler, 371 }, 372 { 373 .procname = "sched_compat_yield", 374 .data = &sysctl_sched_compat_yield, 375 .maxlen = sizeof(unsigned int), 376 .mode = 0644, 377 .proc_handler = proc_dointvec, 378 }, 379 #ifdef CONFIG_PROVE_LOCKING 380 { 381 .procname = "prove_locking", 382 .data = &prove_locking, 383 .maxlen = sizeof(int), 384 .mode = 0644, 385 .proc_handler = proc_dointvec, 386 }, 387 #endif 388 #ifdef CONFIG_LOCK_STAT 389 { 390 .procname = "lock_stat", 391 .data = &lock_stat, 392 .maxlen = sizeof(int), 393 .mode = 0644, 394 .proc_handler = proc_dointvec, 395 }, 396 #endif 397 { 398 .procname = "panic", 399 .data = &panic_timeout, 400 .maxlen = sizeof(int), 401 .mode = 0644, 402 .proc_handler = proc_dointvec, 403 }, 404 { 405 .procname = "core_uses_pid", 406 .data = &core_uses_pid, 407 .maxlen = sizeof(int), 408 .mode = 0644, 409 .proc_handler = proc_dointvec, 410 }, 411 { 412 .procname = "core_pattern", 413 .data = core_pattern, 414 .maxlen = CORENAME_MAX_SIZE, 415 .mode = 0644, 416 .proc_handler = proc_dostring, 417 }, 418 { 419 .procname = "core_pipe_limit", 420 .data = &core_pipe_limit, 421 .maxlen = sizeof(unsigned int), 422 .mode = 0644, 423 .proc_handler = proc_dointvec, 424 }, 425 #ifdef CONFIG_PROC_SYSCTL 426 { 427 .procname = "tainted", 428 .maxlen = sizeof(long), 429 .mode = 0644, 430 .proc_handler = proc_taint, 431 }, 432 #endif 433 #ifdef CONFIG_LATENCYTOP 434 { 435 .procname = "latencytop", 436 .data = &latencytop_enabled, 437 .maxlen = sizeof(int), 438 .mode = 0644, 439 .proc_handler = proc_dointvec, 440 }, 441 #endif 442 #ifdef CONFIG_BLK_DEV_INITRD 443 { 444 .procname = "real-root-dev", 445 .data = &real_root_dev, 446 .maxlen = sizeof(int), 447 .mode = 0644, 448 .proc_handler = proc_dointvec, 449 }, 450 #endif 451 { 452 .procname = "print-fatal-signals", 453 .data = &print_fatal_signals, 454 .maxlen = sizeof(int), 455 .mode = 0644, 456 .proc_handler = proc_dointvec, 457 }, 458 #ifdef CONFIG_SPARC 459 { 460 .procname = "reboot-cmd", 461 .data = reboot_command, 462 .maxlen = 256, 463 .mode = 0644, 464 .proc_handler = proc_dostring, 465 }, 466 { 467 .procname = "stop-a", 468 .data = &stop_a_enabled, 469 .maxlen = sizeof (int), 470 .mode = 0644, 471 .proc_handler = proc_dointvec, 472 }, 473 { 474 .procname = "scons-poweroff", 475 .data = &scons_pwroff, 476 .maxlen = sizeof (int), 477 .mode = 0644, 478 .proc_handler = proc_dointvec, 479 }, 480 #endif 481 #ifdef CONFIG_SPARC64 482 { 483 .procname = "tsb-ratio", 484 .data = &sysctl_tsb_ratio, 485 .maxlen = sizeof (int), 486 .mode = 0644, 487 .proc_handler = proc_dointvec, 488 }, 489 #endif 490 #ifdef __hppa__ 491 { 492 .procname = "soft-power", 493 .data = &pwrsw_enabled, 494 .maxlen = sizeof (int), 495 .mode = 0644, 496 .proc_handler = proc_dointvec, 497 }, 498 { 499 .procname = "unaligned-trap", 500 .data = &unaligned_enabled, 501 .maxlen = sizeof (int), 502 .mode = 0644, 503 .proc_handler = proc_dointvec, 504 }, 505 #endif 506 { 507 .procname = "ctrl-alt-del", 508 .data = &C_A_D, 509 .maxlen = sizeof(int), 510 .mode = 0644, 511 .proc_handler = proc_dointvec, 512 }, 513 #ifdef CONFIG_FUNCTION_TRACER 514 { 515 .procname = "ftrace_enabled", 516 .data = &ftrace_enabled, 517 .maxlen = sizeof(int), 518 .mode = 0644, 519 .proc_handler = ftrace_enable_sysctl, 520 }, 521 #endif 522 #ifdef CONFIG_STACK_TRACER 523 { 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 .procname = "ftrace_dump_on_oops", 534 .data = &ftrace_dump_on_oops, 535 .maxlen = sizeof(int), 536 .mode = 0644, 537 .proc_handler = proc_dointvec, 538 }, 539 #endif 540 #ifdef CONFIG_MODULES 541 { 542 .procname = "modprobe", 543 .data = &modprobe_path, 544 .maxlen = KMOD_PATH_LEN, 545 .mode = 0644, 546 .proc_handler = proc_dostring, 547 }, 548 { 549 .procname = "modules_disabled", 550 .data = &modules_disabled, 551 .maxlen = sizeof(int), 552 .mode = 0644, 553 /* only handle a transition from default "0" to "1" */ 554 .proc_handler = proc_dointvec_minmax, 555 .extra1 = &one, 556 .extra2 = &one, 557 }, 558 #endif 559 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) 560 { 561 .procname = "hotplug", 562 .data = &uevent_helper, 563 .maxlen = UEVENT_HELPER_PATH_LEN, 564 .mode = 0644, 565 .proc_handler = proc_dostring, 566 }, 567 #endif 568 #ifdef CONFIG_CHR_DEV_SG 569 { 570 .procname = "sg-big-buff", 571 .data = &sg_big_buff, 572 .maxlen = sizeof (int), 573 .mode = 0444, 574 .proc_handler = proc_dointvec, 575 }, 576 #endif 577 #ifdef CONFIG_BSD_PROCESS_ACCT 578 { 579 .procname = "acct", 580 .data = &acct_parm, 581 .maxlen = 3*sizeof(int), 582 .mode = 0644, 583 .proc_handler = proc_dointvec, 584 }, 585 #endif 586 #ifdef CONFIG_MAGIC_SYSRQ 587 { 588 .procname = "sysrq", 589 .data = &__sysrq_enabled, 590 .maxlen = sizeof (int), 591 .mode = 0644, 592 .proc_handler = sysrq_sysctl_handler, 593 }, 594 #endif 595 #ifdef CONFIG_PROC_SYSCTL 596 { 597 .procname = "cad_pid", 598 .data = NULL, 599 .maxlen = sizeof (int), 600 .mode = 0600, 601 .proc_handler = proc_do_cad_pid, 602 }, 603 #endif 604 { 605 .procname = "threads-max", 606 .data = &max_threads, 607 .maxlen = sizeof(int), 608 .mode = 0644, 609 .proc_handler = proc_dointvec, 610 }, 611 { 612 .procname = "random", 613 .mode = 0555, 614 .child = random_table, 615 }, 616 { 617 .procname = "overflowuid", 618 .data = &overflowuid, 619 .maxlen = sizeof(int), 620 .mode = 0644, 621 .proc_handler = proc_dointvec_minmax, 622 .extra1 = &minolduid, 623 .extra2 = &maxolduid, 624 }, 625 { 626 .procname = "overflowgid", 627 .data = &overflowgid, 628 .maxlen = sizeof(int), 629 .mode = 0644, 630 .proc_handler = proc_dointvec_minmax, 631 .extra1 = &minolduid, 632 .extra2 = &maxolduid, 633 }, 634 #ifdef CONFIG_S390 635 #ifdef CONFIG_MATHEMU 636 { 637 .procname = "ieee_emulation_warnings", 638 .data = &sysctl_ieee_emulation_warnings, 639 .maxlen = sizeof(int), 640 .mode = 0644, 641 .proc_handler = proc_dointvec, 642 }, 643 #endif 644 { 645 .procname = "userprocess_debug", 646 .data = &show_unhandled_signals, 647 .maxlen = sizeof(int), 648 .mode = 0644, 649 .proc_handler = proc_dointvec, 650 }, 651 #endif 652 { 653 .procname = "pid_max", 654 .data = &pid_max, 655 .maxlen = sizeof (int), 656 .mode = 0644, 657 .proc_handler = proc_dointvec_minmax, 658 .extra1 = &pid_max_min, 659 .extra2 = &pid_max_max, 660 }, 661 { 662 .procname = "panic_on_oops", 663 .data = &panic_on_oops, 664 .maxlen = sizeof(int), 665 .mode = 0644, 666 .proc_handler = proc_dointvec, 667 }, 668 #if defined CONFIG_PRINTK 669 { 670 .procname = "printk", 671 .data = &console_loglevel, 672 .maxlen = 4*sizeof(int), 673 .mode = 0644, 674 .proc_handler = proc_dointvec, 675 }, 676 { 677 .procname = "printk_ratelimit", 678 .data = &printk_ratelimit_state.interval, 679 .maxlen = sizeof(int), 680 .mode = 0644, 681 .proc_handler = proc_dointvec_jiffies, 682 }, 683 { 684 .procname = "printk_ratelimit_burst", 685 .data = &printk_ratelimit_state.burst, 686 .maxlen = sizeof(int), 687 .mode = 0644, 688 .proc_handler = proc_dointvec, 689 }, 690 { 691 .procname = "printk_delay", 692 .data = &printk_delay_msec, 693 .maxlen = sizeof(int), 694 .mode = 0644, 695 .proc_handler = proc_dointvec_minmax, 696 .extra1 = &zero, 697 .extra2 = &ten_thousand, 698 }, 699 #endif 700 { 701 .procname = "ngroups_max", 702 .data = &ngroups_max, 703 .maxlen = sizeof (int), 704 .mode = 0444, 705 .proc_handler = proc_dointvec, 706 }, 707 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 708 { 709 .procname = "unknown_nmi_panic", 710 .data = &unknown_nmi_panic, 711 .maxlen = sizeof (int), 712 .mode = 0644, 713 .proc_handler = proc_dointvec, 714 }, 715 { 716 .procname = "nmi_watchdog", 717 .data = &nmi_watchdog_enabled, 718 .maxlen = sizeof (int), 719 .mode = 0644, 720 .proc_handler = proc_nmi_enabled, 721 }, 722 #endif 723 #if defined(CONFIG_X86) 724 { 725 .procname = "panic_on_unrecovered_nmi", 726 .data = &panic_on_unrecovered_nmi, 727 .maxlen = sizeof(int), 728 .mode = 0644, 729 .proc_handler = proc_dointvec, 730 }, 731 { 732 .procname = "panic_on_io_nmi", 733 .data = &panic_on_io_nmi, 734 .maxlen = sizeof(int), 735 .mode = 0644, 736 .proc_handler = proc_dointvec, 737 }, 738 { 739 .procname = "bootloader_type", 740 .data = &bootloader_type, 741 .maxlen = sizeof (int), 742 .mode = 0444, 743 .proc_handler = proc_dointvec, 744 }, 745 { 746 .procname = "bootloader_version", 747 .data = &bootloader_version, 748 .maxlen = sizeof (int), 749 .mode = 0444, 750 .proc_handler = proc_dointvec, 751 }, 752 { 753 .procname = "kstack_depth_to_print", 754 .data = &kstack_depth_to_print, 755 .maxlen = sizeof(int), 756 .mode = 0644, 757 .proc_handler = proc_dointvec, 758 }, 759 { 760 .procname = "io_delay_type", 761 .data = &io_delay_type, 762 .maxlen = sizeof(int), 763 .mode = 0644, 764 .proc_handler = proc_dointvec, 765 }, 766 #endif 767 #if defined(CONFIG_MMU) 768 { 769 .procname = "randomize_va_space", 770 .data = &randomize_va_space, 771 .maxlen = sizeof(int), 772 .mode = 0644, 773 .proc_handler = proc_dointvec, 774 }, 775 #endif 776 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 777 { 778 .procname = "spin_retry", 779 .data = &spin_retry, 780 .maxlen = sizeof (int), 781 .mode = 0644, 782 .proc_handler = proc_dointvec, 783 }, 784 #endif 785 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 786 { 787 .procname = "acpi_video_flags", 788 .data = &acpi_realmode_flags, 789 .maxlen = sizeof (unsigned long), 790 .mode = 0644, 791 .proc_handler = proc_doulongvec_minmax, 792 }, 793 #endif 794 #ifdef CONFIG_IA64 795 { 796 .procname = "ignore-unaligned-usertrap", 797 .data = &no_unaligned_warning, 798 .maxlen = sizeof (int), 799 .mode = 0644, 800 .proc_handler = proc_dointvec, 801 }, 802 { 803 .procname = "unaligned-dump-stack", 804 .data = &unaligned_dump_stack, 805 .maxlen = sizeof (int), 806 .mode = 0644, 807 .proc_handler = proc_dointvec, 808 }, 809 #endif 810 #ifdef CONFIG_DETECT_SOFTLOCKUP 811 { 812 .procname = "softlockup_panic", 813 .data = &softlockup_panic, 814 .maxlen = sizeof(int), 815 .mode = 0644, 816 .proc_handler = proc_dointvec_minmax, 817 .extra1 = &zero, 818 .extra2 = &one, 819 }, 820 { 821 .procname = "softlockup_thresh", 822 .data = &softlockup_thresh, 823 .maxlen = sizeof(int), 824 .mode = 0644, 825 .proc_handler = proc_dosoftlockup_thresh, 826 .extra1 = &neg_one, 827 .extra2 = &sixty, 828 }, 829 #endif 830 #ifdef CONFIG_DETECT_HUNG_TASK 831 { 832 .procname = "hung_task_panic", 833 .data = &sysctl_hung_task_panic, 834 .maxlen = sizeof(int), 835 .mode = 0644, 836 .proc_handler = proc_dointvec_minmax, 837 .extra1 = &zero, 838 .extra2 = &one, 839 }, 840 { 841 .procname = "hung_task_check_count", 842 .data = &sysctl_hung_task_check_count, 843 .maxlen = sizeof(unsigned long), 844 .mode = 0644, 845 .proc_handler = proc_doulongvec_minmax, 846 }, 847 { 848 .procname = "hung_task_timeout_secs", 849 .data = &sysctl_hung_task_timeout_secs, 850 .maxlen = sizeof(unsigned long), 851 .mode = 0644, 852 .proc_handler = proc_dohung_task_timeout_secs, 853 }, 854 { 855 .procname = "hung_task_warnings", 856 .data = &sysctl_hung_task_warnings, 857 .maxlen = sizeof(unsigned long), 858 .mode = 0644, 859 .proc_handler = proc_doulongvec_minmax, 860 }, 861 #endif 862 #ifdef CONFIG_COMPAT 863 { 864 .procname = "compat-log", 865 .data = &compat_log, 866 .maxlen = sizeof (int), 867 .mode = 0644, 868 .proc_handler = proc_dointvec, 869 }, 870 #endif 871 #ifdef CONFIG_RT_MUTEXES 872 { 873 .procname = "max_lock_depth", 874 .data = &max_lock_depth, 875 .maxlen = sizeof(int), 876 .mode = 0644, 877 .proc_handler = proc_dointvec, 878 }, 879 #endif 880 { 881 .procname = "poweroff_cmd", 882 .data = &poweroff_cmd, 883 .maxlen = POWEROFF_CMD_PATH_LEN, 884 .mode = 0644, 885 .proc_handler = proc_dostring, 886 }, 887 #ifdef CONFIG_KEYS 888 { 889 .procname = "keys", 890 .mode = 0555, 891 .child = key_sysctls, 892 }, 893 #endif 894 #ifdef CONFIG_RCU_TORTURE_TEST 895 { 896 .procname = "rcutorture_runnable", 897 .data = &rcutorture_runnable, 898 .maxlen = sizeof(int), 899 .mode = 0644, 900 .proc_handler = proc_dointvec, 901 }, 902 #endif 903 #ifdef CONFIG_SLOW_WORK 904 { 905 .procname = "slow-work", 906 .mode = 0555, 907 .child = slow_work_sysctls, 908 }, 909 #endif 910 #ifdef CONFIG_PERF_EVENTS 911 { 912 .procname = "perf_event_paranoid", 913 .data = &sysctl_perf_event_paranoid, 914 .maxlen = sizeof(sysctl_perf_event_paranoid), 915 .mode = 0644, 916 .proc_handler = proc_dointvec, 917 }, 918 { 919 .procname = "perf_event_mlock_kb", 920 .data = &sysctl_perf_event_mlock, 921 .maxlen = sizeof(sysctl_perf_event_mlock), 922 .mode = 0644, 923 .proc_handler = proc_dointvec, 924 }, 925 { 926 .procname = "perf_event_max_sample_rate", 927 .data = &sysctl_perf_event_sample_rate, 928 .maxlen = sizeof(sysctl_perf_event_sample_rate), 929 .mode = 0644, 930 .proc_handler = proc_dointvec, 931 }, 932 #endif 933 #ifdef CONFIG_KMEMCHECK 934 { 935 .procname = "kmemcheck", 936 .data = &kmemcheck_enabled, 937 .maxlen = sizeof(int), 938 .mode = 0644, 939 .proc_handler = proc_dointvec, 940 }, 941 #endif 942 #ifdef CONFIG_BLOCK 943 { 944 .procname = "blk_iopoll", 945 .data = &blk_iopoll_enabled, 946 .maxlen = sizeof(int), 947 .mode = 0644, 948 .proc_handler = proc_dointvec, 949 }, 950 #endif 951 /* 952 * NOTE: do not add new entries to this table unless you have read 953 * Documentation/sysctl/ctl_unnumbered.txt 954 */ 955 { } 956 }; 957 958 static struct ctl_table vm_table[] = { 959 { 960 .procname = "overcommit_memory", 961 .data = &sysctl_overcommit_memory, 962 .maxlen = sizeof(sysctl_overcommit_memory), 963 .mode = 0644, 964 .proc_handler = proc_dointvec, 965 }, 966 { 967 .procname = "panic_on_oom", 968 .data = &sysctl_panic_on_oom, 969 .maxlen = sizeof(sysctl_panic_on_oom), 970 .mode = 0644, 971 .proc_handler = proc_dointvec, 972 }, 973 { 974 .procname = "oom_kill_allocating_task", 975 .data = &sysctl_oom_kill_allocating_task, 976 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 977 .mode = 0644, 978 .proc_handler = proc_dointvec, 979 }, 980 { 981 .procname = "oom_dump_tasks", 982 .data = &sysctl_oom_dump_tasks, 983 .maxlen = sizeof(sysctl_oom_dump_tasks), 984 .mode = 0644, 985 .proc_handler = proc_dointvec, 986 }, 987 { 988 .procname = "overcommit_ratio", 989 .data = &sysctl_overcommit_ratio, 990 .maxlen = sizeof(sysctl_overcommit_ratio), 991 .mode = 0644, 992 .proc_handler = proc_dointvec, 993 }, 994 { 995 .procname = "page-cluster", 996 .data = &page_cluster, 997 .maxlen = sizeof(int), 998 .mode = 0644, 999 .proc_handler = proc_dointvec, 1000 }, 1001 { 1002 .procname = "dirty_background_ratio", 1003 .data = &dirty_background_ratio, 1004 .maxlen = sizeof(dirty_background_ratio), 1005 .mode = 0644, 1006 .proc_handler = dirty_background_ratio_handler, 1007 .extra1 = &zero, 1008 .extra2 = &one_hundred, 1009 }, 1010 { 1011 .procname = "dirty_background_bytes", 1012 .data = &dirty_background_bytes, 1013 .maxlen = sizeof(dirty_background_bytes), 1014 .mode = 0644, 1015 .proc_handler = dirty_background_bytes_handler, 1016 .extra1 = &one_ul, 1017 }, 1018 { 1019 .procname = "dirty_ratio", 1020 .data = &vm_dirty_ratio, 1021 .maxlen = sizeof(vm_dirty_ratio), 1022 .mode = 0644, 1023 .proc_handler = dirty_ratio_handler, 1024 .extra1 = &zero, 1025 .extra2 = &one_hundred, 1026 }, 1027 { 1028 .procname = "dirty_bytes", 1029 .data = &vm_dirty_bytes, 1030 .maxlen = sizeof(vm_dirty_bytes), 1031 .mode = 0644, 1032 .proc_handler = dirty_bytes_handler, 1033 .extra1 = &dirty_bytes_min, 1034 }, 1035 { 1036 .procname = "dirty_writeback_centisecs", 1037 .data = &dirty_writeback_interval, 1038 .maxlen = sizeof(dirty_writeback_interval), 1039 .mode = 0644, 1040 .proc_handler = dirty_writeback_centisecs_handler, 1041 }, 1042 { 1043 .procname = "dirty_expire_centisecs", 1044 .data = &dirty_expire_interval, 1045 .maxlen = sizeof(dirty_expire_interval), 1046 .mode = 0644, 1047 .proc_handler = proc_dointvec, 1048 }, 1049 { 1050 .procname = "nr_pdflush_threads", 1051 .data = &nr_pdflush_threads, 1052 .maxlen = sizeof nr_pdflush_threads, 1053 .mode = 0444 /* read-only*/, 1054 .proc_handler = proc_dointvec, 1055 }, 1056 { 1057 .procname = "swappiness", 1058 .data = &vm_swappiness, 1059 .maxlen = sizeof(vm_swappiness), 1060 .mode = 0644, 1061 .proc_handler = proc_dointvec_minmax, 1062 .extra1 = &zero, 1063 .extra2 = &one_hundred, 1064 }, 1065 #ifdef CONFIG_HUGETLB_PAGE 1066 { 1067 .procname = "nr_hugepages", 1068 .data = NULL, 1069 .maxlen = sizeof(unsigned long), 1070 .mode = 0644, 1071 .proc_handler = hugetlb_sysctl_handler, 1072 .extra1 = (void *)&hugetlb_zero, 1073 .extra2 = (void *)&hugetlb_infinity, 1074 }, 1075 #ifdef CONFIG_NUMA 1076 { 1077 .procname = "nr_hugepages_mempolicy", 1078 .data = NULL, 1079 .maxlen = sizeof(unsigned long), 1080 .mode = 0644, 1081 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1082 .extra1 = (void *)&hugetlb_zero, 1083 .extra2 = (void *)&hugetlb_infinity, 1084 }, 1085 #endif 1086 { 1087 .procname = "hugetlb_shm_group", 1088 .data = &sysctl_hugetlb_shm_group, 1089 .maxlen = sizeof(gid_t), 1090 .mode = 0644, 1091 .proc_handler = proc_dointvec, 1092 }, 1093 { 1094 .procname = "hugepages_treat_as_movable", 1095 .data = &hugepages_treat_as_movable, 1096 .maxlen = sizeof(int), 1097 .mode = 0644, 1098 .proc_handler = hugetlb_treat_movable_handler, 1099 }, 1100 { 1101 .procname = "nr_overcommit_hugepages", 1102 .data = NULL, 1103 .maxlen = sizeof(unsigned long), 1104 .mode = 0644, 1105 .proc_handler = hugetlb_overcommit_handler, 1106 .extra1 = (void *)&hugetlb_zero, 1107 .extra2 = (void *)&hugetlb_infinity, 1108 }, 1109 #endif 1110 { 1111 .procname = "lowmem_reserve_ratio", 1112 .data = &sysctl_lowmem_reserve_ratio, 1113 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1114 .mode = 0644, 1115 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1116 }, 1117 { 1118 .procname = "drop_caches", 1119 .data = &sysctl_drop_caches, 1120 .maxlen = sizeof(int), 1121 .mode = 0644, 1122 .proc_handler = drop_caches_sysctl_handler, 1123 }, 1124 { 1125 .procname = "min_free_kbytes", 1126 .data = &min_free_kbytes, 1127 .maxlen = sizeof(min_free_kbytes), 1128 .mode = 0644, 1129 .proc_handler = min_free_kbytes_sysctl_handler, 1130 .extra1 = &zero, 1131 }, 1132 { 1133 .procname = "percpu_pagelist_fraction", 1134 .data = &percpu_pagelist_fraction, 1135 .maxlen = sizeof(percpu_pagelist_fraction), 1136 .mode = 0644, 1137 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1138 .extra1 = &min_percpu_pagelist_fract, 1139 }, 1140 #ifdef CONFIG_MMU 1141 { 1142 .procname = "max_map_count", 1143 .data = &sysctl_max_map_count, 1144 .maxlen = sizeof(sysctl_max_map_count), 1145 .mode = 0644, 1146 .proc_handler = proc_dointvec_minmax, 1147 .extra1 = &zero, 1148 }, 1149 #else 1150 { 1151 .procname = "nr_trim_pages", 1152 .data = &sysctl_nr_trim_pages, 1153 .maxlen = sizeof(sysctl_nr_trim_pages), 1154 .mode = 0644, 1155 .proc_handler = proc_dointvec_minmax, 1156 .extra1 = &zero, 1157 }, 1158 #endif 1159 { 1160 .procname = "laptop_mode", 1161 .data = &laptop_mode, 1162 .maxlen = sizeof(laptop_mode), 1163 .mode = 0644, 1164 .proc_handler = proc_dointvec_jiffies, 1165 }, 1166 { 1167 .procname = "block_dump", 1168 .data = &block_dump, 1169 .maxlen = sizeof(block_dump), 1170 .mode = 0644, 1171 .proc_handler = proc_dointvec, 1172 .extra1 = &zero, 1173 }, 1174 { 1175 .procname = "vfs_cache_pressure", 1176 .data = &sysctl_vfs_cache_pressure, 1177 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1178 .mode = 0644, 1179 .proc_handler = proc_dointvec, 1180 .extra1 = &zero, 1181 }, 1182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1183 { 1184 .procname = "legacy_va_layout", 1185 .data = &sysctl_legacy_va_layout, 1186 .maxlen = sizeof(sysctl_legacy_va_layout), 1187 .mode = 0644, 1188 .proc_handler = proc_dointvec, 1189 .extra1 = &zero, 1190 }, 1191 #endif 1192 #ifdef CONFIG_NUMA 1193 { 1194 .procname = "zone_reclaim_mode", 1195 .data = &zone_reclaim_mode, 1196 .maxlen = sizeof(zone_reclaim_mode), 1197 .mode = 0644, 1198 .proc_handler = proc_dointvec, 1199 .extra1 = &zero, 1200 }, 1201 { 1202 .procname = "min_unmapped_ratio", 1203 .data = &sysctl_min_unmapped_ratio, 1204 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1205 .mode = 0644, 1206 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1207 .extra1 = &zero, 1208 .extra2 = &one_hundred, 1209 }, 1210 { 1211 .procname = "min_slab_ratio", 1212 .data = &sysctl_min_slab_ratio, 1213 .maxlen = sizeof(sysctl_min_slab_ratio), 1214 .mode = 0644, 1215 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1216 .extra1 = &zero, 1217 .extra2 = &one_hundred, 1218 }, 1219 #endif 1220 #ifdef CONFIG_SMP 1221 { 1222 .procname = "stat_interval", 1223 .data = &sysctl_stat_interval, 1224 .maxlen = sizeof(sysctl_stat_interval), 1225 .mode = 0644, 1226 .proc_handler = proc_dointvec_jiffies, 1227 }, 1228 #endif 1229 #ifdef CONFIG_MMU 1230 { 1231 .procname = "mmap_min_addr", 1232 .data = &dac_mmap_min_addr, 1233 .maxlen = sizeof(unsigned long), 1234 .mode = 0644, 1235 .proc_handler = mmap_min_addr_handler, 1236 }, 1237 #endif 1238 #ifdef CONFIG_NUMA 1239 { 1240 .procname = "numa_zonelist_order", 1241 .data = &numa_zonelist_order, 1242 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1243 .mode = 0644, 1244 .proc_handler = numa_zonelist_order_handler, 1245 }, 1246 #endif 1247 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1248 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1249 { 1250 .procname = "vdso_enabled", 1251 .data = &vdso_enabled, 1252 .maxlen = sizeof(vdso_enabled), 1253 .mode = 0644, 1254 .proc_handler = proc_dointvec, 1255 .extra1 = &zero, 1256 }, 1257 #endif 1258 #ifdef CONFIG_HIGHMEM 1259 { 1260 .procname = "highmem_is_dirtyable", 1261 .data = &vm_highmem_is_dirtyable, 1262 .maxlen = sizeof(vm_highmem_is_dirtyable), 1263 .mode = 0644, 1264 .proc_handler = proc_dointvec_minmax, 1265 .extra1 = &zero, 1266 .extra2 = &one, 1267 }, 1268 #endif 1269 { 1270 .procname = "scan_unevictable_pages", 1271 .data = &scan_unevictable_pages, 1272 .maxlen = sizeof(scan_unevictable_pages), 1273 .mode = 0644, 1274 .proc_handler = scan_unevictable_handler, 1275 }, 1276 #ifdef CONFIG_MEMORY_FAILURE 1277 { 1278 .procname = "memory_failure_early_kill", 1279 .data = &sysctl_memory_failure_early_kill, 1280 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1281 .mode = 0644, 1282 .proc_handler = proc_dointvec_minmax, 1283 .extra1 = &zero, 1284 .extra2 = &one, 1285 }, 1286 { 1287 .procname = "memory_failure_recovery", 1288 .data = &sysctl_memory_failure_recovery, 1289 .maxlen = sizeof(sysctl_memory_failure_recovery), 1290 .mode = 0644, 1291 .proc_handler = proc_dointvec_minmax, 1292 .extra1 = &zero, 1293 .extra2 = &one, 1294 }, 1295 #endif 1296 1297 /* 1298 * NOTE: do not add new entries to this table unless you have read 1299 * Documentation/sysctl/ctl_unnumbered.txt 1300 */ 1301 { } 1302 }; 1303 1304 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1305 static struct ctl_table binfmt_misc_table[] = { 1306 { } 1307 }; 1308 #endif 1309 1310 static struct ctl_table fs_table[] = { 1311 { 1312 .procname = "inode-nr", 1313 .data = &inodes_stat, 1314 .maxlen = 2*sizeof(int), 1315 .mode = 0444, 1316 .proc_handler = proc_dointvec, 1317 }, 1318 { 1319 .procname = "inode-state", 1320 .data = &inodes_stat, 1321 .maxlen = 7*sizeof(int), 1322 .mode = 0444, 1323 .proc_handler = proc_dointvec, 1324 }, 1325 { 1326 .procname = "file-nr", 1327 .data = &files_stat, 1328 .maxlen = 3*sizeof(int), 1329 .mode = 0444, 1330 .proc_handler = proc_nr_files, 1331 }, 1332 { 1333 .procname = "file-max", 1334 .data = &files_stat.max_files, 1335 .maxlen = sizeof(int), 1336 .mode = 0644, 1337 .proc_handler = proc_dointvec, 1338 }, 1339 { 1340 .procname = "nr_open", 1341 .data = &sysctl_nr_open, 1342 .maxlen = sizeof(int), 1343 .mode = 0644, 1344 .proc_handler = proc_dointvec_minmax, 1345 .extra1 = &sysctl_nr_open_min, 1346 .extra2 = &sysctl_nr_open_max, 1347 }, 1348 { 1349 .procname = "dentry-state", 1350 .data = &dentry_stat, 1351 .maxlen = 6*sizeof(int), 1352 .mode = 0444, 1353 .proc_handler = proc_dointvec, 1354 }, 1355 { 1356 .procname = "overflowuid", 1357 .data = &fs_overflowuid, 1358 .maxlen = sizeof(int), 1359 .mode = 0644, 1360 .proc_handler = proc_dointvec_minmax, 1361 .extra1 = &minolduid, 1362 .extra2 = &maxolduid, 1363 }, 1364 { 1365 .procname = "overflowgid", 1366 .data = &fs_overflowgid, 1367 .maxlen = sizeof(int), 1368 .mode = 0644, 1369 .proc_handler = proc_dointvec_minmax, 1370 .extra1 = &minolduid, 1371 .extra2 = &maxolduid, 1372 }, 1373 #ifdef CONFIG_FILE_LOCKING 1374 { 1375 .procname = "leases-enable", 1376 .data = &leases_enable, 1377 .maxlen = sizeof(int), 1378 .mode = 0644, 1379 .proc_handler = proc_dointvec, 1380 }, 1381 #endif 1382 #ifdef CONFIG_DNOTIFY 1383 { 1384 .procname = "dir-notify-enable", 1385 .data = &dir_notify_enable, 1386 .maxlen = sizeof(int), 1387 .mode = 0644, 1388 .proc_handler = proc_dointvec, 1389 }, 1390 #endif 1391 #ifdef CONFIG_MMU 1392 #ifdef CONFIG_FILE_LOCKING 1393 { 1394 .procname = "lease-break-time", 1395 .data = &lease_break_time, 1396 .maxlen = sizeof(int), 1397 .mode = 0644, 1398 .proc_handler = proc_dointvec, 1399 }, 1400 #endif 1401 #ifdef CONFIG_AIO 1402 { 1403 .procname = "aio-nr", 1404 .data = &aio_nr, 1405 .maxlen = sizeof(aio_nr), 1406 .mode = 0444, 1407 .proc_handler = proc_doulongvec_minmax, 1408 }, 1409 { 1410 .procname = "aio-max-nr", 1411 .data = &aio_max_nr, 1412 .maxlen = sizeof(aio_max_nr), 1413 .mode = 0644, 1414 .proc_handler = proc_doulongvec_minmax, 1415 }, 1416 #endif /* CONFIG_AIO */ 1417 #ifdef CONFIG_INOTIFY_USER 1418 { 1419 .procname = "inotify", 1420 .mode = 0555, 1421 .child = inotify_table, 1422 }, 1423 #endif 1424 #ifdef CONFIG_EPOLL 1425 { 1426 .procname = "epoll", 1427 .mode = 0555, 1428 .child = epoll_table, 1429 }, 1430 #endif 1431 #endif 1432 { 1433 .procname = "suid_dumpable", 1434 .data = &suid_dumpable, 1435 .maxlen = sizeof(int), 1436 .mode = 0644, 1437 .proc_handler = proc_dointvec_minmax, 1438 .extra1 = &zero, 1439 .extra2 = &two, 1440 }, 1441 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1442 { 1443 .procname = "binfmt_misc", 1444 .mode = 0555, 1445 .child = binfmt_misc_table, 1446 }, 1447 #endif 1448 { 1449 .procname = "pipe-max-pages", 1450 .data = &pipe_max_pages, 1451 .maxlen = sizeof(int), 1452 .mode = 0644, 1453 .proc_handler = &proc_dointvec_minmax, 1454 .extra1 = &two, 1455 }, 1456 /* 1457 * NOTE: do not add new entries to this table unless you have read 1458 * Documentation/sysctl/ctl_unnumbered.txt 1459 */ 1460 { } 1461 }; 1462 1463 static struct ctl_table debug_table[] = { 1464 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1465 defined(CONFIG_S390) 1466 { 1467 .procname = "exception-trace", 1468 .data = &show_unhandled_signals, 1469 .maxlen = sizeof(int), 1470 .mode = 0644, 1471 .proc_handler = proc_dointvec 1472 }, 1473 #endif 1474 #if defined(CONFIG_OPTPROBES) 1475 { 1476 .procname = "kprobes-optimization", 1477 .data = &sysctl_kprobes_optimization, 1478 .maxlen = sizeof(int), 1479 .mode = 0644, 1480 .proc_handler = proc_kprobes_optimization_handler, 1481 .extra1 = &zero, 1482 .extra2 = &one, 1483 }, 1484 #endif 1485 { } 1486 }; 1487 1488 static struct ctl_table dev_table[] = { 1489 { } 1490 }; 1491 1492 static DEFINE_SPINLOCK(sysctl_lock); 1493 1494 /* called under sysctl_lock */ 1495 static int use_table(struct ctl_table_header *p) 1496 { 1497 if (unlikely(p->unregistering)) 1498 return 0; 1499 p->used++; 1500 return 1; 1501 } 1502 1503 /* called under sysctl_lock */ 1504 static void unuse_table(struct ctl_table_header *p) 1505 { 1506 if (!--p->used) 1507 if (unlikely(p->unregistering)) 1508 complete(p->unregistering); 1509 } 1510 1511 /* called under sysctl_lock, will reacquire if has to wait */ 1512 static void start_unregistering(struct ctl_table_header *p) 1513 { 1514 /* 1515 * if p->used is 0, nobody will ever touch that entry again; 1516 * we'll eliminate all paths to it before dropping sysctl_lock 1517 */ 1518 if (unlikely(p->used)) { 1519 struct completion wait; 1520 init_completion(&wait); 1521 p->unregistering = &wait; 1522 spin_unlock(&sysctl_lock); 1523 wait_for_completion(&wait); 1524 spin_lock(&sysctl_lock); 1525 } else { 1526 /* anything non-NULL; we'll never dereference it */ 1527 p->unregistering = ERR_PTR(-EINVAL); 1528 } 1529 /* 1530 * do not remove from the list until nobody holds it; walking the 1531 * list in do_sysctl() relies on that. 1532 */ 1533 list_del_init(&p->ctl_entry); 1534 } 1535 1536 void sysctl_head_get(struct ctl_table_header *head) 1537 { 1538 spin_lock(&sysctl_lock); 1539 head->count++; 1540 spin_unlock(&sysctl_lock); 1541 } 1542 1543 void sysctl_head_put(struct ctl_table_header *head) 1544 { 1545 spin_lock(&sysctl_lock); 1546 if (!--head->count) 1547 kfree(head); 1548 spin_unlock(&sysctl_lock); 1549 } 1550 1551 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1552 { 1553 if (!head) 1554 BUG(); 1555 spin_lock(&sysctl_lock); 1556 if (!use_table(head)) 1557 head = ERR_PTR(-ENOENT); 1558 spin_unlock(&sysctl_lock); 1559 return head; 1560 } 1561 1562 void sysctl_head_finish(struct ctl_table_header *head) 1563 { 1564 if (!head) 1565 return; 1566 spin_lock(&sysctl_lock); 1567 unuse_table(head); 1568 spin_unlock(&sysctl_lock); 1569 } 1570 1571 static struct ctl_table_set * 1572 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1573 { 1574 struct ctl_table_set *set = &root->default_set; 1575 if (root->lookup) 1576 set = root->lookup(root, namespaces); 1577 return set; 1578 } 1579 1580 static struct list_head * 1581 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1582 { 1583 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1584 return &set->list; 1585 } 1586 1587 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1588 struct ctl_table_header *prev) 1589 { 1590 struct ctl_table_root *root; 1591 struct list_head *header_list; 1592 struct ctl_table_header *head; 1593 struct list_head *tmp; 1594 1595 spin_lock(&sysctl_lock); 1596 if (prev) { 1597 head = prev; 1598 tmp = &prev->ctl_entry; 1599 unuse_table(prev); 1600 goto next; 1601 } 1602 tmp = &root_table_header.ctl_entry; 1603 for (;;) { 1604 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1605 1606 if (!use_table(head)) 1607 goto next; 1608 spin_unlock(&sysctl_lock); 1609 return head; 1610 next: 1611 root = head->root; 1612 tmp = tmp->next; 1613 header_list = lookup_header_list(root, namespaces); 1614 if (tmp != header_list) 1615 continue; 1616 1617 do { 1618 root = list_entry(root->root_list.next, 1619 struct ctl_table_root, root_list); 1620 if (root == &sysctl_table_root) 1621 goto out; 1622 header_list = lookup_header_list(root, namespaces); 1623 } while (list_empty(header_list)); 1624 tmp = header_list->next; 1625 } 1626 out: 1627 spin_unlock(&sysctl_lock); 1628 return NULL; 1629 } 1630 1631 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1632 { 1633 return __sysctl_head_next(current->nsproxy, prev); 1634 } 1635 1636 void register_sysctl_root(struct ctl_table_root *root) 1637 { 1638 spin_lock(&sysctl_lock); 1639 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1640 spin_unlock(&sysctl_lock); 1641 } 1642 1643 /* 1644 * sysctl_perm does NOT grant the superuser all rights automatically, because 1645 * some sysctl variables are readonly even to root. 1646 */ 1647 1648 static int test_perm(int mode, int op) 1649 { 1650 if (!current_euid()) 1651 mode >>= 6; 1652 else if (in_egroup_p(0)) 1653 mode >>= 3; 1654 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1655 return 0; 1656 return -EACCES; 1657 } 1658 1659 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1660 { 1661 int error; 1662 int mode; 1663 1664 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1665 if (error) 1666 return error; 1667 1668 if (root->permissions) 1669 mode = root->permissions(root, current->nsproxy, table); 1670 else 1671 mode = table->mode; 1672 1673 return test_perm(mode, op); 1674 } 1675 1676 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1677 { 1678 for (; table->procname; table++) { 1679 table->parent = parent; 1680 if (table->child) 1681 sysctl_set_parent(table, table->child); 1682 } 1683 } 1684 1685 static __init int sysctl_init(void) 1686 { 1687 sysctl_set_parent(NULL, root_table); 1688 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1689 { 1690 int err; 1691 err = sysctl_check_table(current->nsproxy, root_table); 1692 } 1693 #endif 1694 return 0; 1695 } 1696 1697 core_initcall(sysctl_init); 1698 1699 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1700 struct ctl_table *table) 1701 { 1702 struct ctl_table *p; 1703 const char *s = branch->procname; 1704 1705 /* branch should have named subdirectory as its first element */ 1706 if (!s || !branch->child) 1707 return NULL; 1708 1709 /* ... and nothing else */ 1710 if (branch[1].procname) 1711 return NULL; 1712 1713 /* table should contain subdirectory with the same name */ 1714 for (p = table; p->procname; p++) { 1715 if (!p->child) 1716 continue; 1717 if (p->procname && strcmp(p->procname, s) == 0) 1718 return p; 1719 } 1720 return NULL; 1721 } 1722 1723 /* see if attaching q to p would be an improvement */ 1724 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1725 { 1726 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1727 struct ctl_table *next; 1728 int is_better = 0; 1729 int not_in_parent = !p->attached_by; 1730 1731 while ((next = is_branch_in(by, to)) != NULL) { 1732 if (by == q->attached_by) 1733 is_better = 1; 1734 if (to == p->attached_by) 1735 not_in_parent = 1; 1736 by = by->child; 1737 to = next->child; 1738 } 1739 1740 if (is_better && not_in_parent) { 1741 q->attached_by = by; 1742 q->attached_to = to; 1743 q->parent = p; 1744 } 1745 } 1746 1747 /** 1748 * __register_sysctl_paths - register a sysctl hierarchy 1749 * @root: List of sysctl headers to register on 1750 * @namespaces: Data to compute which lists of sysctl entries are visible 1751 * @path: The path to the directory the sysctl table is in. 1752 * @table: the top-level table structure 1753 * 1754 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1755 * array. A completely 0 filled entry terminates the table. 1756 * 1757 * The members of the &struct ctl_table structure are used as follows: 1758 * 1759 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1760 * enter a sysctl file 1761 * 1762 * data - a pointer to data for use by proc_handler 1763 * 1764 * maxlen - the maximum size in bytes of the data 1765 * 1766 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1767 * 1768 * child - a pointer to the child sysctl table if this entry is a directory, or 1769 * %NULL. 1770 * 1771 * proc_handler - the text handler routine (described below) 1772 * 1773 * de - for internal use by the sysctl routines 1774 * 1775 * extra1, extra2 - extra pointers usable by the proc handler routines 1776 * 1777 * Leaf nodes in the sysctl tree will be represented by a single file 1778 * under /proc; non-leaf nodes will be represented by directories. 1779 * 1780 * sysctl(2) can automatically manage read and write requests through 1781 * the sysctl table. The data and maxlen fields of the ctl_table 1782 * struct enable minimal validation of the values being written to be 1783 * performed, and the mode field allows minimal authentication. 1784 * 1785 * There must be a proc_handler routine for any terminal nodes 1786 * mirrored under /proc/sys (non-terminals are handled by a built-in 1787 * directory handler). Several default handlers are available to 1788 * cover common cases - 1789 * 1790 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1791 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1792 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1793 * 1794 * It is the handler's job to read the input buffer from user memory 1795 * and process it. The handler should return 0 on success. 1796 * 1797 * This routine returns %NULL on a failure to register, and a pointer 1798 * to the table header on success. 1799 */ 1800 struct ctl_table_header *__register_sysctl_paths( 1801 struct ctl_table_root *root, 1802 struct nsproxy *namespaces, 1803 const struct ctl_path *path, struct ctl_table *table) 1804 { 1805 struct ctl_table_header *header; 1806 struct ctl_table *new, **prevp; 1807 unsigned int n, npath; 1808 struct ctl_table_set *set; 1809 1810 /* Count the path components */ 1811 for (npath = 0; path[npath].procname; ++npath) 1812 ; 1813 1814 /* 1815 * For each path component, allocate a 2-element ctl_table array. 1816 * The first array element will be filled with the sysctl entry 1817 * for this, the second will be the sentinel (procname == 0). 1818 * 1819 * We allocate everything in one go so that we don't have to 1820 * worry about freeing additional memory in unregister_sysctl_table. 1821 */ 1822 header = kzalloc(sizeof(struct ctl_table_header) + 1823 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1824 if (!header) 1825 return NULL; 1826 1827 new = (struct ctl_table *) (header + 1); 1828 1829 /* Now connect the dots */ 1830 prevp = &header->ctl_table; 1831 for (n = 0; n < npath; ++n, ++path) { 1832 /* Copy the procname */ 1833 new->procname = path->procname; 1834 new->mode = 0555; 1835 1836 *prevp = new; 1837 prevp = &new->child; 1838 1839 new += 2; 1840 } 1841 *prevp = table; 1842 header->ctl_table_arg = table; 1843 1844 INIT_LIST_HEAD(&header->ctl_entry); 1845 header->used = 0; 1846 header->unregistering = NULL; 1847 header->root = root; 1848 sysctl_set_parent(NULL, header->ctl_table); 1849 header->count = 1; 1850 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1851 if (sysctl_check_table(namespaces, header->ctl_table)) { 1852 kfree(header); 1853 return NULL; 1854 } 1855 #endif 1856 spin_lock(&sysctl_lock); 1857 header->set = lookup_header_set(root, namespaces); 1858 header->attached_by = header->ctl_table; 1859 header->attached_to = root_table; 1860 header->parent = &root_table_header; 1861 for (set = header->set; set; set = set->parent) { 1862 struct ctl_table_header *p; 1863 list_for_each_entry(p, &set->list, ctl_entry) { 1864 if (p->unregistering) 1865 continue; 1866 try_attach(p, header); 1867 } 1868 } 1869 header->parent->count++; 1870 list_add_tail(&header->ctl_entry, &header->set->list); 1871 spin_unlock(&sysctl_lock); 1872 1873 return header; 1874 } 1875 1876 /** 1877 * register_sysctl_table_path - register a sysctl table hierarchy 1878 * @path: The path to the directory the sysctl table is in. 1879 * @table: the top-level table structure 1880 * 1881 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1882 * array. A completely 0 filled entry terminates the table. 1883 * 1884 * See __register_sysctl_paths for more details. 1885 */ 1886 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1887 struct ctl_table *table) 1888 { 1889 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1890 path, table); 1891 } 1892 1893 /** 1894 * register_sysctl_table - register a sysctl table hierarchy 1895 * @table: the top-level table structure 1896 * 1897 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1898 * array. A completely 0 filled entry terminates the table. 1899 * 1900 * See register_sysctl_paths for more details. 1901 */ 1902 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1903 { 1904 static const struct ctl_path null_path[] = { {} }; 1905 1906 return register_sysctl_paths(null_path, table); 1907 } 1908 1909 /** 1910 * unregister_sysctl_table - unregister a sysctl table hierarchy 1911 * @header: the header returned from register_sysctl_table 1912 * 1913 * Unregisters the sysctl table and all children. proc entries may not 1914 * actually be removed until they are no longer used by anyone. 1915 */ 1916 void unregister_sysctl_table(struct ctl_table_header * header) 1917 { 1918 might_sleep(); 1919 1920 if (header == NULL) 1921 return; 1922 1923 spin_lock(&sysctl_lock); 1924 start_unregistering(header); 1925 if (!--header->parent->count) { 1926 WARN_ON(1); 1927 kfree(header->parent); 1928 } 1929 if (!--header->count) 1930 kfree(header); 1931 spin_unlock(&sysctl_lock); 1932 } 1933 1934 int sysctl_is_seen(struct ctl_table_header *p) 1935 { 1936 struct ctl_table_set *set = p->set; 1937 int res; 1938 spin_lock(&sysctl_lock); 1939 if (p->unregistering) 1940 res = 0; 1941 else if (!set->is_seen) 1942 res = 1; 1943 else 1944 res = set->is_seen(set); 1945 spin_unlock(&sysctl_lock); 1946 return res; 1947 } 1948 1949 void setup_sysctl_set(struct ctl_table_set *p, 1950 struct ctl_table_set *parent, 1951 int (*is_seen)(struct ctl_table_set *)) 1952 { 1953 INIT_LIST_HEAD(&p->list); 1954 p->parent = parent ? parent : &sysctl_table_root.default_set; 1955 p->is_seen = is_seen; 1956 } 1957 1958 #else /* !CONFIG_SYSCTL */ 1959 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1960 { 1961 return NULL; 1962 } 1963 1964 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1965 struct ctl_table *table) 1966 { 1967 return NULL; 1968 } 1969 1970 void unregister_sysctl_table(struct ctl_table_header * table) 1971 { 1972 } 1973 1974 void setup_sysctl_set(struct ctl_table_set *p, 1975 struct ctl_table_set *parent, 1976 int (*is_seen)(struct ctl_table_set *)) 1977 { 1978 } 1979 1980 void sysctl_head_put(struct ctl_table_header *head) 1981 { 1982 } 1983 1984 #endif /* CONFIG_SYSCTL */ 1985 1986 /* 1987 * /proc/sys support 1988 */ 1989 1990 #ifdef CONFIG_PROC_SYSCTL 1991 1992 static int _proc_do_string(void* data, int maxlen, int write, 1993 void __user *buffer, 1994 size_t *lenp, loff_t *ppos) 1995 { 1996 size_t len; 1997 char __user *p; 1998 char c; 1999 2000 if (!data || !maxlen || !*lenp) { 2001 *lenp = 0; 2002 return 0; 2003 } 2004 2005 if (write) { 2006 len = 0; 2007 p = buffer; 2008 while (len < *lenp) { 2009 if (get_user(c, p++)) 2010 return -EFAULT; 2011 if (c == 0 || c == '\n') 2012 break; 2013 len++; 2014 } 2015 if (len >= maxlen) 2016 len = maxlen-1; 2017 if(copy_from_user(data, buffer, len)) 2018 return -EFAULT; 2019 ((char *) data)[len] = 0; 2020 *ppos += *lenp; 2021 } else { 2022 len = strlen(data); 2023 if (len > maxlen) 2024 len = maxlen; 2025 2026 if (*ppos > len) { 2027 *lenp = 0; 2028 return 0; 2029 } 2030 2031 data += *ppos; 2032 len -= *ppos; 2033 2034 if (len > *lenp) 2035 len = *lenp; 2036 if (len) 2037 if(copy_to_user(buffer, data, len)) 2038 return -EFAULT; 2039 if (len < *lenp) { 2040 if(put_user('\n', ((char __user *) buffer) + len)) 2041 return -EFAULT; 2042 len++; 2043 } 2044 *lenp = len; 2045 *ppos += len; 2046 } 2047 return 0; 2048 } 2049 2050 /** 2051 * proc_dostring - read a string sysctl 2052 * @table: the sysctl table 2053 * @write: %TRUE if this is a write to the sysctl file 2054 * @buffer: the user buffer 2055 * @lenp: the size of the user buffer 2056 * @ppos: file position 2057 * 2058 * Reads/writes a string from/to the user buffer. If the kernel 2059 * buffer provided is not large enough to hold the string, the 2060 * string is truncated. The copied string is %NULL-terminated. 2061 * If the string is being read by the user process, it is copied 2062 * and a newline '\n' is added. It is truncated if the buffer is 2063 * not large enough. 2064 * 2065 * Returns 0 on success. 2066 */ 2067 int proc_dostring(struct ctl_table *table, int write, 2068 void __user *buffer, size_t *lenp, loff_t *ppos) 2069 { 2070 return _proc_do_string(table->data, table->maxlen, write, 2071 buffer, lenp, ppos); 2072 } 2073 2074 static size_t proc_skip_spaces(char **buf) 2075 { 2076 size_t ret; 2077 char *tmp = skip_spaces(*buf); 2078 ret = tmp - *buf; 2079 *buf = tmp; 2080 return ret; 2081 } 2082 2083 static void proc_skip_char(char **buf, size_t *size, const char v) 2084 { 2085 while (*size) { 2086 if (**buf != v) 2087 break; 2088 (*size)--; 2089 (*buf)++; 2090 } 2091 } 2092 2093 #define TMPBUFLEN 22 2094 /** 2095 * proc_get_long - reads an ASCII formatted integer from a user buffer 2096 * 2097 * @buf: a kernel buffer 2098 * @size: size of the kernel buffer 2099 * @val: this is where the number will be stored 2100 * @neg: set to %TRUE if number is negative 2101 * @perm_tr: a vector which contains the allowed trailers 2102 * @perm_tr_len: size of the perm_tr vector 2103 * @tr: pointer to store the trailer character 2104 * 2105 * In case of success %0 is returned and @buf and @size are updated with 2106 * the amount of bytes read. If @tr is non-NULL and a trailing 2107 * character exists (size is non-zero after returning from this 2108 * function), @tr is updated with the trailing character. 2109 */ 2110 static int proc_get_long(char **buf, size_t *size, 2111 unsigned long *val, bool *neg, 2112 const char *perm_tr, unsigned perm_tr_len, char *tr) 2113 { 2114 int len; 2115 char *p, tmp[TMPBUFLEN]; 2116 2117 if (!*size) 2118 return -EINVAL; 2119 2120 len = *size; 2121 if (len > TMPBUFLEN - 1) 2122 len = TMPBUFLEN - 1; 2123 2124 memcpy(tmp, *buf, len); 2125 2126 tmp[len] = 0; 2127 p = tmp; 2128 if (*p == '-' && *size > 1) { 2129 *neg = true; 2130 p++; 2131 } else 2132 *neg = false; 2133 if (!isdigit(*p)) 2134 return -EINVAL; 2135 2136 *val = simple_strtoul(p, &p, 0); 2137 2138 len = p - tmp; 2139 2140 /* We don't know if the next char is whitespace thus we may accept 2141 * invalid integers (e.g. 1234...a) or two integers instead of one 2142 * (e.g. 123...1). So lets not allow such large numbers. */ 2143 if (len == TMPBUFLEN - 1) 2144 return -EINVAL; 2145 2146 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2147 return -EINVAL; 2148 2149 if (tr && (len < *size)) 2150 *tr = *p; 2151 2152 *buf += len; 2153 *size -= len; 2154 2155 return 0; 2156 } 2157 2158 /** 2159 * proc_put_long - converts an integer to a decimal ASCII formatted string 2160 * 2161 * @buf: the user buffer 2162 * @size: the size of the user buffer 2163 * @val: the integer to be converted 2164 * @neg: sign of the number, %TRUE for negative 2165 * 2166 * In case of success %0 is returned and @buf and @size are updated with 2167 * the amount of bytes written. 2168 */ 2169 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2170 bool neg) 2171 { 2172 int len; 2173 char tmp[TMPBUFLEN], *p = tmp; 2174 2175 sprintf(p, "%s%lu", neg ? "-" : "", val); 2176 len = strlen(tmp); 2177 if (len > *size) 2178 len = *size; 2179 if (copy_to_user(*buf, tmp, len)) 2180 return -EFAULT; 2181 *size -= len; 2182 *buf += len; 2183 return 0; 2184 } 2185 #undef TMPBUFLEN 2186 2187 static int proc_put_char(void __user **buf, size_t *size, char c) 2188 { 2189 if (*size) { 2190 char __user **buffer = (char __user **)buf; 2191 if (put_user(c, *buffer)) 2192 return -EFAULT; 2193 (*size)--, (*buffer)++; 2194 *buf = *buffer; 2195 } 2196 return 0; 2197 } 2198 2199 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2200 int *valp, 2201 int write, void *data) 2202 { 2203 if (write) { 2204 *valp = *negp ? -*lvalp : *lvalp; 2205 } else { 2206 int val = *valp; 2207 if (val < 0) { 2208 *negp = true; 2209 *lvalp = (unsigned long)-val; 2210 } else { 2211 *negp = false; 2212 *lvalp = (unsigned long)val; 2213 } 2214 } 2215 return 0; 2216 } 2217 2218 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2219 2220 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2221 int write, void __user *buffer, 2222 size_t *lenp, loff_t *ppos, 2223 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2224 int write, void *data), 2225 void *data) 2226 { 2227 int *i, vleft, first = 1, err = 0; 2228 unsigned long page = 0; 2229 size_t left; 2230 char *kbuf; 2231 2232 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2233 *lenp = 0; 2234 return 0; 2235 } 2236 2237 i = (int *) tbl_data; 2238 vleft = table->maxlen / sizeof(*i); 2239 left = *lenp; 2240 2241 if (!conv) 2242 conv = do_proc_dointvec_conv; 2243 2244 if (write) { 2245 if (left > PAGE_SIZE - 1) 2246 left = PAGE_SIZE - 1; 2247 page = __get_free_page(GFP_TEMPORARY); 2248 kbuf = (char *) page; 2249 if (!kbuf) 2250 return -ENOMEM; 2251 if (copy_from_user(kbuf, buffer, left)) { 2252 err = -EFAULT; 2253 goto free; 2254 } 2255 kbuf[left] = 0; 2256 } 2257 2258 for (; left && vleft--; i++, first=0) { 2259 unsigned long lval; 2260 bool neg; 2261 2262 if (write) { 2263 left -= proc_skip_spaces(&kbuf); 2264 2265 err = proc_get_long(&kbuf, &left, &lval, &neg, 2266 proc_wspace_sep, 2267 sizeof(proc_wspace_sep), NULL); 2268 if (err) 2269 break; 2270 if (conv(&neg, &lval, i, 1, data)) { 2271 err = -EINVAL; 2272 break; 2273 } 2274 } else { 2275 if (conv(&neg, &lval, i, 0, data)) { 2276 err = -EINVAL; 2277 break; 2278 } 2279 if (!first) 2280 err = proc_put_char(&buffer, &left, '\t'); 2281 if (err) 2282 break; 2283 err = proc_put_long(&buffer, &left, lval, neg); 2284 if (err) 2285 break; 2286 } 2287 } 2288 2289 if (!write && !first && left && !err) 2290 err = proc_put_char(&buffer, &left, '\n'); 2291 if (write && !err) 2292 left -= proc_skip_spaces(&kbuf); 2293 free: 2294 if (write) { 2295 free_page(page); 2296 if (first) 2297 return err ? : -EINVAL; 2298 } 2299 *lenp -= left; 2300 *ppos += *lenp; 2301 return err; 2302 } 2303 2304 static int do_proc_dointvec(struct ctl_table *table, int write, 2305 void __user *buffer, size_t *lenp, loff_t *ppos, 2306 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2307 int write, void *data), 2308 void *data) 2309 { 2310 return __do_proc_dointvec(table->data, table, write, 2311 buffer, lenp, ppos, conv, data); 2312 } 2313 2314 /** 2315 * proc_dointvec - read a vector of integers 2316 * @table: the sysctl table 2317 * @write: %TRUE if this is a write to the sysctl file 2318 * @buffer: the user buffer 2319 * @lenp: the size of the user buffer 2320 * @ppos: file position 2321 * 2322 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2323 * values from/to the user buffer, treated as an ASCII string. 2324 * 2325 * Returns 0 on success. 2326 */ 2327 int proc_dointvec(struct ctl_table *table, int write, 2328 void __user *buffer, size_t *lenp, loff_t *ppos) 2329 { 2330 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2331 NULL,NULL); 2332 } 2333 2334 /* 2335 * Taint values can only be increased 2336 * This means we can safely use a temporary. 2337 */ 2338 static int proc_taint(struct ctl_table *table, int write, 2339 void __user *buffer, size_t *lenp, loff_t *ppos) 2340 { 2341 struct ctl_table t; 2342 unsigned long tmptaint = get_taint(); 2343 int err; 2344 2345 if (write && !capable(CAP_SYS_ADMIN)) 2346 return -EPERM; 2347 2348 t = *table; 2349 t.data = &tmptaint; 2350 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2351 if (err < 0) 2352 return err; 2353 2354 if (write) { 2355 /* 2356 * Poor man's atomic or. Not worth adding a primitive 2357 * to everyone's atomic.h for this 2358 */ 2359 int i; 2360 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2361 if ((tmptaint >> i) & 1) 2362 add_taint(i); 2363 } 2364 } 2365 2366 return err; 2367 } 2368 2369 struct do_proc_dointvec_minmax_conv_param { 2370 int *min; 2371 int *max; 2372 }; 2373 2374 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2375 int *valp, 2376 int write, void *data) 2377 { 2378 struct do_proc_dointvec_minmax_conv_param *param = data; 2379 if (write) { 2380 int val = *negp ? -*lvalp : *lvalp; 2381 if ((param->min && *param->min > val) || 2382 (param->max && *param->max < val)) 2383 return -EINVAL; 2384 *valp = val; 2385 } else { 2386 int val = *valp; 2387 if (val < 0) { 2388 *negp = true; 2389 *lvalp = (unsigned long)-val; 2390 } else { 2391 *negp = false; 2392 *lvalp = (unsigned long)val; 2393 } 2394 } 2395 return 0; 2396 } 2397 2398 /** 2399 * proc_dointvec_minmax - read a vector of integers with min/max values 2400 * @table: the sysctl table 2401 * @write: %TRUE if this is a write to the sysctl file 2402 * @buffer: the user buffer 2403 * @lenp: the size of the user buffer 2404 * @ppos: file position 2405 * 2406 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2407 * values from/to the user buffer, treated as an ASCII string. 2408 * 2409 * This routine will ensure the values are within the range specified by 2410 * table->extra1 (min) and table->extra2 (max). 2411 * 2412 * Returns 0 on success. 2413 */ 2414 int proc_dointvec_minmax(struct ctl_table *table, int write, 2415 void __user *buffer, size_t *lenp, loff_t *ppos) 2416 { 2417 struct do_proc_dointvec_minmax_conv_param param = { 2418 .min = (int *) table->extra1, 2419 .max = (int *) table->extra2, 2420 }; 2421 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2422 do_proc_dointvec_minmax_conv, ¶m); 2423 } 2424 2425 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2426 void __user *buffer, 2427 size_t *lenp, loff_t *ppos, 2428 unsigned long convmul, 2429 unsigned long convdiv) 2430 { 2431 unsigned long *i, *min, *max; 2432 int vleft, first = 1, err = 0; 2433 unsigned long page = 0; 2434 size_t left; 2435 char *kbuf; 2436 2437 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2438 *lenp = 0; 2439 return 0; 2440 } 2441 2442 i = (unsigned long *) data; 2443 min = (unsigned long *) table->extra1; 2444 max = (unsigned long *) table->extra2; 2445 vleft = table->maxlen / sizeof(unsigned long); 2446 left = *lenp; 2447 2448 if (write) { 2449 if (left > PAGE_SIZE - 1) 2450 left = PAGE_SIZE - 1; 2451 page = __get_free_page(GFP_TEMPORARY); 2452 kbuf = (char *) page; 2453 if (!kbuf) 2454 return -ENOMEM; 2455 if (copy_from_user(kbuf, buffer, left)) { 2456 err = -EFAULT; 2457 goto free; 2458 } 2459 kbuf[left] = 0; 2460 } 2461 2462 for (; left && vleft--; i++, min++, max++, first=0) { 2463 unsigned long val; 2464 2465 if (write) { 2466 bool neg; 2467 2468 left -= proc_skip_spaces(&kbuf); 2469 2470 err = proc_get_long(&kbuf, &left, &val, &neg, 2471 proc_wspace_sep, 2472 sizeof(proc_wspace_sep), NULL); 2473 if (err) 2474 break; 2475 if (neg) 2476 continue; 2477 if ((min && val < *min) || (max && val > *max)) 2478 continue; 2479 *i = val; 2480 } else { 2481 val = convdiv * (*i) / convmul; 2482 if (!first) 2483 err = proc_put_char(&buffer, &left, '\t'); 2484 err = proc_put_long(&buffer, &left, val, false); 2485 if (err) 2486 break; 2487 } 2488 } 2489 2490 if (!write && !first && left && !err) 2491 err = proc_put_char(&buffer, &left, '\n'); 2492 if (write && !err) 2493 left -= proc_skip_spaces(&kbuf); 2494 free: 2495 if (write) { 2496 free_page(page); 2497 if (first) 2498 return err ? : -EINVAL; 2499 } 2500 *lenp -= left; 2501 *ppos += *lenp; 2502 return err; 2503 } 2504 2505 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2506 void __user *buffer, 2507 size_t *lenp, loff_t *ppos, 2508 unsigned long convmul, 2509 unsigned long convdiv) 2510 { 2511 return __do_proc_doulongvec_minmax(table->data, table, write, 2512 buffer, lenp, ppos, convmul, convdiv); 2513 } 2514 2515 /** 2516 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2517 * @table: the sysctl table 2518 * @write: %TRUE if this is a write to the sysctl file 2519 * @buffer: the user buffer 2520 * @lenp: the size of the user buffer 2521 * @ppos: file position 2522 * 2523 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2524 * values from/to the user buffer, treated as an ASCII string. 2525 * 2526 * This routine will ensure the values are within the range specified by 2527 * table->extra1 (min) and table->extra2 (max). 2528 * 2529 * Returns 0 on success. 2530 */ 2531 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2532 void __user *buffer, size_t *lenp, loff_t *ppos) 2533 { 2534 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2535 } 2536 2537 /** 2538 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2539 * @table: the sysctl table 2540 * @write: %TRUE if this is a write to the sysctl file 2541 * @buffer: the user buffer 2542 * @lenp: the size of the user buffer 2543 * @ppos: file position 2544 * 2545 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2546 * values from/to the user buffer, treated as an ASCII string. The values 2547 * are treated as milliseconds, and converted to jiffies when they are stored. 2548 * 2549 * This routine will ensure the values are within the range specified by 2550 * table->extra1 (min) and table->extra2 (max). 2551 * 2552 * Returns 0 on success. 2553 */ 2554 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2555 void __user *buffer, 2556 size_t *lenp, loff_t *ppos) 2557 { 2558 return do_proc_doulongvec_minmax(table, write, buffer, 2559 lenp, ppos, HZ, 1000l); 2560 } 2561 2562 2563 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2564 int *valp, 2565 int write, void *data) 2566 { 2567 if (write) { 2568 if (*lvalp > LONG_MAX / HZ) 2569 return 1; 2570 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2571 } else { 2572 int val = *valp; 2573 unsigned long lval; 2574 if (val < 0) { 2575 *negp = true; 2576 lval = (unsigned long)-val; 2577 } else { 2578 *negp = false; 2579 lval = (unsigned long)val; 2580 } 2581 *lvalp = lval / HZ; 2582 } 2583 return 0; 2584 } 2585 2586 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2587 int *valp, 2588 int write, void *data) 2589 { 2590 if (write) { 2591 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2592 return 1; 2593 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2594 } else { 2595 int val = *valp; 2596 unsigned long lval; 2597 if (val < 0) { 2598 *negp = true; 2599 lval = (unsigned long)-val; 2600 } else { 2601 *negp = false; 2602 lval = (unsigned long)val; 2603 } 2604 *lvalp = jiffies_to_clock_t(lval); 2605 } 2606 return 0; 2607 } 2608 2609 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2610 int *valp, 2611 int write, void *data) 2612 { 2613 if (write) { 2614 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2615 } else { 2616 int val = *valp; 2617 unsigned long lval; 2618 if (val < 0) { 2619 *negp = true; 2620 lval = (unsigned long)-val; 2621 } else { 2622 *negp = false; 2623 lval = (unsigned long)val; 2624 } 2625 *lvalp = jiffies_to_msecs(lval); 2626 } 2627 return 0; 2628 } 2629 2630 /** 2631 * proc_dointvec_jiffies - read a vector of integers as seconds 2632 * @table: the sysctl table 2633 * @write: %TRUE if this is a write to the sysctl file 2634 * @buffer: the user buffer 2635 * @lenp: the size of the user buffer 2636 * @ppos: file position 2637 * 2638 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2639 * values from/to the user buffer, treated as an ASCII string. 2640 * The values read are assumed to be in seconds, and are converted into 2641 * jiffies. 2642 * 2643 * Returns 0 on success. 2644 */ 2645 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2646 void __user *buffer, size_t *lenp, loff_t *ppos) 2647 { 2648 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2649 do_proc_dointvec_jiffies_conv,NULL); 2650 } 2651 2652 /** 2653 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2654 * @table: the sysctl table 2655 * @write: %TRUE if this is a write to the sysctl file 2656 * @buffer: the user buffer 2657 * @lenp: the size of the user buffer 2658 * @ppos: pointer to the file position 2659 * 2660 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2661 * values from/to the user buffer, treated as an ASCII string. 2662 * The values read are assumed to be in 1/USER_HZ seconds, and 2663 * are converted into jiffies. 2664 * 2665 * Returns 0 on success. 2666 */ 2667 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2668 void __user *buffer, size_t *lenp, loff_t *ppos) 2669 { 2670 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2671 do_proc_dointvec_userhz_jiffies_conv,NULL); 2672 } 2673 2674 /** 2675 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2676 * @table: the sysctl table 2677 * @write: %TRUE if this is a write to the sysctl file 2678 * @buffer: the user buffer 2679 * @lenp: the size of the user buffer 2680 * @ppos: file position 2681 * @ppos: the current position in the file 2682 * 2683 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2684 * values from/to the user buffer, treated as an ASCII string. 2685 * The values read are assumed to be in 1/1000 seconds, and 2686 * are converted into jiffies. 2687 * 2688 * Returns 0 on success. 2689 */ 2690 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2691 void __user *buffer, size_t *lenp, loff_t *ppos) 2692 { 2693 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2694 do_proc_dointvec_ms_jiffies_conv, NULL); 2695 } 2696 2697 static int proc_do_cad_pid(struct ctl_table *table, int write, 2698 void __user *buffer, size_t *lenp, loff_t *ppos) 2699 { 2700 struct pid *new_pid; 2701 pid_t tmp; 2702 int r; 2703 2704 tmp = pid_vnr(cad_pid); 2705 2706 r = __do_proc_dointvec(&tmp, table, write, buffer, 2707 lenp, ppos, NULL, NULL); 2708 if (r || !write) 2709 return r; 2710 2711 new_pid = find_get_pid(tmp); 2712 if (!new_pid) 2713 return -ESRCH; 2714 2715 put_pid(xchg(&cad_pid, new_pid)); 2716 return 0; 2717 } 2718 2719 /** 2720 * proc_do_large_bitmap - read/write from/to a large bitmap 2721 * @table: the sysctl table 2722 * @write: %TRUE if this is a write to the sysctl file 2723 * @buffer: the user buffer 2724 * @lenp: the size of the user buffer 2725 * @ppos: file position 2726 * 2727 * The bitmap is stored at table->data and the bitmap length (in bits) 2728 * in table->maxlen. 2729 * 2730 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2731 * large bitmaps may be represented in a compact manner. Writing into 2732 * the file will clear the bitmap then update it with the given input. 2733 * 2734 * Returns 0 on success. 2735 */ 2736 int proc_do_large_bitmap(struct ctl_table *table, int write, 2737 void __user *buffer, size_t *lenp, loff_t *ppos) 2738 { 2739 int err = 0; 2740 bool first = 1; 2741 size_t left = *lenp; 2742 unsigned long bitmap_len = table->maxlen; 2743 unsigned long *bitmap = (unsigned long *) table->data; 2744 unsigned long *tmp_bitmap = NULL; 2745 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2746 2747 if (!bitmap_len || !left || (*ppos && !write)) { 2748 *lenp = 0; 2749 return 0; 2750 } 2751 2752 if (write) { 2753 unsigned long page = 0; 2754 char *kbuf; 2755 2756 if (left > PAGE_SIZE - 1) 2757 left = PAGE_SIZE - 1; 2758 2759 page = __get_free_page(GFP_TEMPORARY); 2760 kbuf = (char *) page; 2761 if (!kbuf) 2762 return -ENOMEM; 2763 if (copy_from_user(kbuf, buffer, left)) { 2764 free_page(page); 2765 return -EFAULT; 2766 } 2767 kbuf[left] = 0; 2768 2769 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2770 GFP_KERNEL); 2771 if (!tmp_bitmap) { 2772 free_page(page); 2773 return -ENOMEM; 2774 } 2775 proc_skip_char(&kbuf, &left, '\n'); 2776 while (!err && left) { 2777 unsigned long val_a, val_b; 2778 bool neg; 2779 2780 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2781 sizeof(tr_a), &c); 2782 if (err) 2783 break; 2784 if (val_a >= bitmap_len || neg) { 2785 err = -EINVAL; 2786 break; 2787 } 2788 2789 val_b = val_a; 2790 if (left) { 2791 kbuf++; 2792 left--; 2793 } 2794 2795 if (c == '-') { 2796 err = proc_get_long(&kbuf, &left, &val_b, 2797 &neg, tr_b, sizeof(tr_b), 2798 &c); 2799 if (err) 2800 break; 2801 if (val_b >= bitmap_len || neg || 2802 val_a > val_b) { 2803 err = -EINVAL; 2804 break; 2805 } 2806 if (left) { 2807 kbuf++; 2808 left--; 2809 } 2810 } 2811 2812 while (val_a <= val_b) 2813 set_bit(val_a++, tmp_bitmap); 2814 2815 first = 0; 2816 proc_skip_char(&kbuf, &left, '\n'); 2817 } 2818 free_page(page); 2819 } else { 2820 unsigned long bit_a, bit_b = 0; 2821 2822 while (left) { 2823 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2824 if (bit_a >= bitmap_len) 2825 break; 2826 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2827 bit_a + 1) - 1; 2828 2829 if (!first) { 2830 err = proc_put_char(&buffer, &left, ','); 2831 if (err) 2832 break; 2833 } 2834 err = proc_put_long(&buffer, &left, bit_a, false); 2835 if (err) 2836 break; 2837 if (bit_a != bit_b) { 2838 err = proc_put_char(&buffer, &left, '-'); 2839 if (err) 2840 break; 2841 err = proc_put_long(&buffer, &left, bit_b, false); 2842 if (err) 2843 break; 2844 } 2845 2846 first = 0; bit_b++; 2847 } 2848 if (!err) 2849 err = proc_put_char(&buffer, &left, '\n'); 2850 } 2851 2852 if (!err) { 2853 if (write) { 2854 if (*ppos) 2855 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2856 else 2857 memcpy(bitmap, tmp_bitmap, 2858 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2859 } 2860 kfree(tmp_bitmap); 2861 *lenp -= left; 2862 *ppos += *lenp; 2863 return 0; 2864 } else { 2865 kfree(tmp_bitmap); 2866 return err; 2867 } 2868 } 2869 2870 #else /* CONFIG_PROC_FS */ 2871 2872 int proc_dostring(struct ctl_table *table, int write, 2873 void __user *buffer, size_t *lenp, loff_t *ppos) 2874 { 2875 return -ENOSYS; 2876 } 2877 2878 int proc_dointvec(struct ctl_table *table, int write, 2879 void __user *buffer, size_t *lenp, loff_t *ppos) 2880 { 2881 return -ENOSYS; 2882 } 2883 2884 int proc_dointvec_minmax(struct ctl_table *table, int write, 2885 void __user *buffer, size_t *lenp, loff_t *ppos) 2886 { 2887 return -ENOSYS; 2888 } 2889 2890 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2891 void __user *buffer, size_t *lenp, loff_t *ppos) 2892 { 2893 return -ENOSYS; 2894 } 2895 2896 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2897 void __user *buffer, size_t *lenp, loff_t *ppos) 2898 { 2899 return -ENOSYS; 2900 } 2901 2902 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2903 void __user *buffer, size_t *lenp, loff_t *ppos) 2904 { 2905 return -ENOSYS; 2906 } 2907 2908 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2909 void __user *buffer, size_t *lenp, loff_t *ppos) 2910 { 2911 return -ENOSYS; 2912 } 2913 2914 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2915 void __user *buffer, 2916 size_t *lenp, loff_t *ppos) 2917 { 2918 return -ENOSYS; 2919 } 2920 2921 2922 #endif /* CONFIG_PROC_FS */ 2923 2924 /* 2925 * No sense putting this after each symbol definition, twice, 2926 * exception granted :-) 2927 */ 2928 EXPORT_SYMBOL(proc_dointvec); 2929 EXPORT_SYMBOL(proc_dointvec_jiffies); 2930 EXPORT_SYMBOL(proc_dointvec_minmax); 2931 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2932 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2933 EXPORT_SYMBOL(proc_dostring); 2934 EXPORT_SYMBOL(proc_doulongvec_minmax); 2935 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2936 EXPORT_SYMBOL(register_sysctl_table); 2937 EXPORT_SYMBOL(register_sysctl_paths); 2938 EXPORT_SYMBOL(unregister_sysctl_table); 2939