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/printk.h> 28 #include <linux/proc_fs.h> 29 #include <linux/security.h> 30 #include <linux/ctype.h> 31 #include <linux/kmemcheck.h> 32 #include <linux/fs.h> 33 #include <linux/init.h> 34 #include <linux/kernel.h> 35 #include <linux/kobject.h> 36 #include <linux/net.h> 37 #include <linux/sysrq.h> 38 #include <linux/highuid.h> 39 #include <linux/writeback.h> 40 #include <linux/ratelimit.h> 41 #include <linux/compaction.h> 42 #include <linux/hugetlb.h> 43 #include <linux/initrd.h> 44 #include <linux/key.h> 45 #include <linux/times.h> 46 #include <linux/limits.h> 47 #include <linux/dcache.h> 48 #include <linux/dnotify.h> 49 #include <linux/syscalls.h> 50 #include <linux/vmstat.h> 51 #include <linux/nfs_fs.h> 52 #include <linux/acpi.h> 53 #include <linux/reboot.h> 54 #include <linux/ftrace.h> 55 #include <linux/perf_event.h> 56 #include <linux/kprobes.h> 57 #include <linux/pipe_fs_i.h> 58 #include <linux/oom.h> 59 60 #include <asm/uaccess.h> 61 #include <asm/processor.h> 62 63 #ifdef CONFIG_X86 64 #include <asm/nmi.h> 65 #include <asm/stacktrace.h> 66 #include <asm/io.h> 67 #endif 68 #ifdef CONFIG_BSD_PROCESS_ACCT 69 #include <linux/acct.h> 70 #endif 71 #ifdef CONFIG_RT_MUTEXES 72 #include <linux/rtmutex.h> 73 #endif 74 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 75 #include <linux/lockdep.h> 76 #endif 77 #ifdef CONFIG_CHR_DEV_SG 78 #include <scsi/sg.h> 79 #endif 80 81 #ifdef CONFIG_LOCKUP_DETECTOR 82 #include <linux/nmi.h> 83 #endif 84 85 86 #if defined(CONFIG_SYSCTL) 87 88 /* External variables not in a header file. */ 89 extern int sysctl_overcommit_memory; 90 extern int sysctl_overcommit_ratio; 91 extern int max_threads; 92 extern int core_uses_pid; 93 extern int suid_dumpable; 94 extern char core_pattern[]; 95 extern unsigned int core_pipe_limit; 96 extern int pid_max; 97 extern int min_free_kbytes; 98 extern int pid_max_min, pid_max_max; 99 extern int sysctl_drop_caches; 100 extern int percpu_pagelist_fraction; 101 extern int compat_log; 102 extern int latencytop_enabled; 103 extern int sysctl_nr_open_min, sysctl_nr_open_max; 104 #ifndef CONFIG_MMU 105 extern int sysctl_nr_trim_pages; 106 #endif 107 #ifdef CONFIG_BLOCK 108 extern int blk_iopoll_enabled; 109 #endif 110 111 /* Constants used for minimum and maximum */ 112 #ifdef CONFIG_LOCKUP_DETECTOR 113 static int sixty = 60; 114 static int neg_one = -1; 115 #endif 116 117 static int zero; 118 static int __maybe_unused one = 1; 119 static int __maybe_unused two = 2; 120 static unsigned long one_ul = 1; 121 static int one_hundred = 100; 122 #ifdef CONFIG_PRINTK 123 static int ten_thousand = 10000; 124 #endif 125 126 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 127 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 128 129 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 130 static int maxolduid = 65535; 131 static int minolduid; 132 static int min_percpu_pagelist_fract = 8; 133 134 static int ngroups_max = NGROUPS_MAX; 135 136 #ifdef CONFIG_INOTIFY_USER 137 #include <linux/inotify.h> 138 #endif 139 #ifdef CONFIG_SPARC 140 #include <asm/system.h> 141 #endif 142 143 #ifdef CONFIG_SPARC64 144 extern int sysctl_tsb_ratio; 145 #endif 146 147 #ifdef __hppa__ 148 extern int pwrsw_enabled; 149 extern int unaligned_enabled; 150 #endif 151 152 #ifdef CONFIG_S390 153 #ifdef CONFIG_MATHEMU 154 extern int sysctl_ieee_emulation_warnings; 155 #endif 156 extern int sysctl_userprocess_debug; 157 extern int spin_retry; 158 #endif 159 160 #ifdef CONFIG_IA64 161 extern int no_unaligned_warning; 162 extern int unaligned_dump_stack; 163 #endif 164 165 #ifdef CONFIG_PROC_SYSCTL 166 static int proc_do_cad_pid(struct ctl_table *table, int write, 167 void __user *buffer, size_t *lenp, loff_t *ppos); 168 static int proc_taint(struct ctl_table *table, int write, 169 void __user *buffer, size_t *lenp, loff_t *ppos); 170 #endif 171 172 #ifdef CONFIG_MAGIC_SYSRQ 173 static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */ 174 175 static int sysrq_sysctl_handler(ctl_table *table, int write, 176 void __user *buffer, size_t *lenp, 177 loff_t *ppos) 178 { 179 int error; 180 181 error = proc_dointvec(table, write, buffer, lenp, ppos); 182 if (error) 183 return error; 184 185 if (write) 186 sysrq_toggle_support(__sysrq_enabled); 187 188 return 0; 189 } 190 191 #endif 192 193 static struct ctl_table root_table[]; 194 static struct ctl_table_root sysctl_table_root; 195 static struct ctl_table_header root_table_header = { 196 .count = 1, 197 .ctl_table = root_table, 198 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 199 .root = &sysctl_table_root, 200 .set = &sysctl_table_root.default_set, 201 }; 202 static struct ctl_table_root sysctl_table_root = { 203 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 204 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 205 }; 206 207 static struct ctl_table kern_table[]; 208 static struct ctl_table vm_table[]; 209 static struct ctl_table fs_table[]; 210 static struct ctl_table debug_table[]; 211 static struct ctl_table dev_table[]; 212 extern struct ctl_table random_table[]; 213 #ifdef CONFIG_EPOLL 214 extern struct ctl_table epoll_table[]; 215 #endif 216 217 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 218 int sysctl_legacy_va_layout; 219 #endif 220 221 /* The default sysctl tables: */ 222 223 static struct ctl_table root_table[] = { 224 { 225 .procname = "kernel", 226 .mode = 0555, 227 .child = kern_table, 228 }, 229 { 230 .procname = "vm", 231 .mode = 0555, 232 .child = vm_table, 233 }, 234 { 235 .procname = "fs", 236 .mode = 0555, 237 .child = fs_table, 238 }, 239 { 240 .procname = "debug", 241 .mode = 0555, 242 .child = debug_table, 243 }, 244 { 245 .procname = "dev", 246 .mode = 0555, 247 .child = dev_table, 248 }, 249 /* 250 * NOTE: do not add new entries to this table unless you have read 251 * Documentation/sysctl/ctl_unnumbered.txt 252 */ 253 { } 254 }; 255 256 #ifdef CONFIG_SCHED_DEBUG 257 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 258 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 259 static int min_wakeup_granularity_ns; /* 0 usecs */ 260 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 261 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 262 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 263 #endif 264 265 #ifdef CONFIG_COMPACTION 266 static int min_extfrag_threshold; 267 static int max_extfrag_threshold = 1000; 268 #endif 269 270 static struct ctl_table kern_table[] = { 271 { 272 .procname = "sched_child_runs_first", 273 .data = &sysctl_sched_child_runs_first, 274 .maxlen = sizeof(unsigned int), 275 .mode = 0644, 276 .proc_handler = proc_dointvec, 277 }, 278 #ifdef CONFIG_SCHED_DEBUG 279 { 280 .procname = "sched_min_granularity_ns", 281 .data = &sysctl_sched_min_granularity, 282 .maxlen = sizeof(unsigned int), 283 .mode = 0644, 284 .proc_handler = sched_proc_update_handler, 285 .extra1 = &min_sched_granularity_ns, 286 .extra2 = &max_sched_granularity_ns, 287 }, 288 { 289 .procname = "sched_latency_ns", 290 .data = &sysctl_sched_latency, 291 .maxlen = sizeof(unsigned int), 292 .mode = 0644, 293 .proc_handler = sched_proc_update_handler, 294 .extra1 = &min_sched_granularity_ns, 295 .extra2 = &max_sched_granularity_ns, 296 }, 297 { 298 .procname = "sched_wakeup_granularity_ns", 299 .data = &sysctl_sched_wakeup_granularity, 300 .maxlen = sizeof(unsigned int), 301 .mode = 0644, 302 .proc_handler = sched_proc_update_handler, 303 .extra1 = &min_wakeup_granularity_ns, 304 .extra2 = &max_wakeup_granularity_ns, 305 }, 306 { 307 .procname = "sched_tunable_scaling", 308 .data = &sysctl_sched_tunable_scaling, 309 .maxlen = sizeof(enum sched_tunable_scaling), 310 .mode = 0644, 311 .proc_handler = sched_proc_update_handler, 312 .extra1 = &min_sched_tunable_scaling, 313 .extra2 = &max_sched_tunable_scaling, 314 }, 315 { 316 .procname = "sched_migration_cost", 317 .data = &sysctl_sched_migration_cost, 318 .maxlen = sizeof(unsigned int), 319 .mode = 0644, 320 .proc_handler = proc_dointvec, 321 }, 322 { 323 .procname = "sched_nr_migrate", 324 .data = &sysctl_sched_nr_migrate, 325 .maxlen = sizeof(unsigned int), 326 .mode = 0644, 327 .proc_handler = proc_dointvec, 328 }, 329 { 330 .procname = "sched_time_avg", 331 .data = &sysctl_sched_time_avg, 332 .maxlen = sizeof(unsigned int), 333 .mode = 0644, 334 .proc_handler = proc_dointvec, 335 }, 336 { 337 .procname = "sched_shares_window", 338 .data = &sysctl_sched_shares_window, 339 .maxlen = sizeof(unsigned int), 340 .mode = 0644, 341 .proc_handler = proc_dointvec, 342 }, 343 { 344 .procname = "timer_migration", 345 .data = &sysctl_timer_migration, 346 .maxlen = sizeof(unsigned int), 347 .mode = 0644, 348 .proc_handler = proc_dointvec_minmax, 349 .extra1 = &zero, 350 .extra2 = &one, 351 }, 352 #endif 353 { 354 .procname = "sched_rt_period_us", 355 .data = &sysctl_sched_rt_period, 356 .maxlen = sizeof(unsigned int), 357 .mode = 0644, 358 .proc_handler = sched_rt_handler, 359 }, 360 { 361 .procname = "sched_rt_runtime_us", 362 .data = &sysctl_sched_rt_runtime, 363 .maxlen = sizeof(int), 364 .mode = 0644, 365 .proc_handler = sched_rt_handler, 366 }, 367 { 368 .procname = "sched_compat_yield", 369 .data = &sysctl_sched_compat_yield, 370 .maxlen = sizeof(unsigned int), 371 .mode = 0644, 372 .proc_handler = proc_dointvec, 373 }, 374 #ifdef CONFIG_SCHED_AUTOGROUP 375 { 376 .procname = "sched_autogroup_enabled", 377 .data = &sysctl_sched_autogroup_enabled, 378 .maxlen = sizeof(unsigned int), 379 .mode = 0644, 380 .proc_handler = proc_dointvec, 381 .extra1 = &zero, 382 .extra2 = &one, 383 }, 384 #endif 385 #ifdef CONFIG_PROVE_LOCKING 386 { 387 .procname = "prove_locking", 388 .data = &prove_locking, 389 .maxlen = sizeof(int), 390 .mode = 0644, 391 .proc_handler = proc_dointvec, 392 }, 393 #endif 394 #ifdef CONFIG_LOCK_STAT 395 { 396 .procname = "lock_stat", 397 .data = &lock_stat, 398 .maxlen = sizeof(int), 399 .mode = 0644, 400 .proc_handler = proc_dointvec, 401 }, 402 #endif 403 { 404 .procname = "panic", 405 .data = &panic_timeout, 406 .maxlen = sizeof(int), 407 .mode = 0644, 408 .proc_handler = proc_dointvec, 409 }, 410 { 411 .procname = "core_uses_pid", 412 .data = &core_uses_pid, 413 .maxlen = sizeof(int), 414 .mode = 0644, 415 .proc_handler = proc_dointvec, 416 }, 417 { 418 .procname = "core_pattern", 419 .data = core_pattern, 420 .maxlen = CORENAME_MAX_SIZE, 421 .mode = 0644, 422 .proc_handler = proc_dostring, 423 }, 424 { 425 .procname = "core_pipe_limit", 426 .data = &core_pipe_limit, 427 .maxlen = sizeof(unsigned int), 428 .mode = 0644, 429 .proc_handler = proc_dointvec, 430 }, 431 #ifdef CONFIG_PROC_SYSCTL 432 { 433 .procname = "tainted", 434 .maxlen = sizeof(long), 435 .mode = 0644, 436 .proc_handler = proc_taint, 437 }, 438 #endif 439 #ifdef CONFIG_LATENCYTOP 440 { 441 .procname = "latencytop", 442 .data = &latencytop_enabled, 443 .maxlen = sizeof(int), 444 .mode = 0644, 445 .proc_handler = proc_dointvec, 446 }, 447 #endif 448 #ifdef CONFIG_BLK_DEV_INITRD 449 { 450 .procname = "real-root-dev", 451 .data = &real_root_dev, 452 .maxlen = sizeof(int), 453 .mode = 0644, 454 .proc_handler = proc_dointvec, 455 }, 456 #endif 457 { 458 .procname = "print-fatal-signals", 459 .data = &print_fatal_signals, 460 .maxlen = sizeof(int), 461 .mode = 0644, 462 .proc_handler = proc_dointvec, 463 }, 464 #ifdef CONFIG_SPARC 465 { 466 .procname = "reboot-cmd", 467 .data = reboot_command, 468 .maxlen = 256, 469 .mode = 0644, 470 .proc_handler = proc_dostring, 471 }, 472 { 473 .procname = "stop-a", 474 .data = &stop_a_enabled, 475 .maxlen = sizeof (int), 476 .mode = 0644, 477 .proc_handler = proc_dointvec, 478 }, 479 { 480 .procname = "scons-poweroff", 481 .data = &scons_pwroff, 482 .maxlen = sizeof (int), 483 .mode = 0644, 484 .proc_handler = proc_dointvec, 485 }, 486 #endif 487 #ifdef CONFIG_SPARC64 488 { 489 .procname = "tsb-ratio", 490 .data = &sysctl_tsb_ratio, 491 .maxlen = sizeof (int), 492 .mode = 0644, 493 .proc_handler = proc_dointvec, 494 }, 495 #endif 496 #ifdef __hppa__ 497 { 498 .procname = "soft-power", 499 .data = &pwrsw_enabled, 500 .maxlen = sizeof (int), 501 .mode = 0644, 502 .proc_handler = proc_dointvec, 503 }, 504 { 505 .procname = "unaligned-trap", 506 .data = &unaligned_enabled, 507 .maxlen = sizeof (int), 508 .mode = 0644, 509 .proc_handler = proc_dointvec, 510 }, 511 #endif 512 { 513 .procname = "ctrl-alt-del", 514 .data = &C_A_D, 515 .maxlen = sizeof(int), 516 .mode = 0644, 517 .proc_handler = proc_dointvec, 518 }, 519 #ifdef CONFIG_FUNCTION_TRACER 520 { 521 .procname = "ftrace_enabled", 522 .data = &ftrace_enabled, 523 .maxlen = sizeof(int), 524 .mode = 0644, 525 .proc_handler = ftrace_enable_sysctl, 526 }, 527 #endif 528 #ifdef CONFIG_STACK_TRACER 529 { 530 .procname = "stack_tracer_enabled", 531 .data = &stack_tracer_enabled, 532 .maxlen = sizeof(int), 533 .mode = 0644, 534 .proc_handler = stack_trace_sysctl, 535 }, 536 #endif 537 #ifdef CONFIG_TRACING 538 { 539 .procname = "ftrace_dump_on_oops", 540 .data = &ftrace_dump_on_oops, 541 .maxlen = sizeof(int), 542 .mode = 0644, 543 .proc_handler = proc_dointvec, 544 }, 545 #endif 546 #ifdef CONFIG_MODULES 547 { 548 .procname = "modprobe", 549 .data = &modprobe_path, 550 .maxlen = KMOD_PATH_LEN, 551 .mode = 0644, 552 .proc_handler = proc_dostring, 553 }, 554 { 555 .procname = "modules_disabled", 556 .data = &modules_disabled, 557 .maxlen = sizeof(int), 558 .mode = 0644, 559 /* only handle a transition from default "0" to "1" */ 560 .proc_handler = proc_dointvec_minmax, 561 .extra1 = &one, 562 .extra2 = &one, 563 }, 564 #endif 565 #ifdef CONFIG_HOTPLUG 566 { 567 .procname = "hotplug", 568 .data = &uevent_helper, 569 .maxlen = UEVENT_HELPER_PATH_LEN, 570 .mode = 0644, 571 .proc_handler = proc_dostring, 572 }, 573 #endif 574 #ifdef CONFIG_CHR_DEV_SG 575 { 576 .procname = "sg-big-buff", 577 .data = &sg_big_buff, 578 .maxlen = sizeof (int), 579 .mode = 0444, 580 .proc_handler = proc_dointvec, 581 }, 582 #endif 583 #ifdef CONFIG_BSD_PROCESS_ACCT 584 { 585 .procname = "acct", 586 .data = &acct_parm, 587 .maxlen = 3*sizeof(int), 588 .mode = 0644, 589 .proc_handler = proc_dointvec, 590 }, 591 #endif 592 #ifdef CONFIG_MAGIC_SYSRQ 593 { 594 .procname = "sysrq", 595 .data = &__sysrq_enabled, 596 .maxlen = sizeof (int), 597 .mode = 0644, 598 .proc_handler = sysrq_sysctl_handler, 599 }, 600 #endif 601 #ifdef CONFIG_PROC_SYSCTL 602 { 603 .procname = "cad_pid", 604 .data = NULL, 605 .maxlen = sizeof (int), 606 .mode = 0600, 607 .proc_handler = proc_do_cad_pid, 608 }, 609 #endif 610 { 611 .procname = "threads-max", 612 .data = &max_threads, 613 .maxlen = sizeof(int), 614 .mode = 0644, 615 .proc_handler = proc_dointvec, 616 }, 617 { 618 .procname = "random", 619 .mode = 0555, 620 .child = random_table, 621 }, 622 { 623 .procname = "overflowuid", 624 .data = &overflowuid, 625 .maxlen = sizeof(int), 626 .mode = 0644, 627 .proc_handler = proc_dointvec_minmax, 628 .extra1 = &minolduid, 629 .extra2 = &maxolduid, 630 }, 631 { 632 .procname = "overflowgid", 633 .data = &overflowgid, 634 .maxlen = sizeof(int), 635 .mode = 0644, 636 .proc_handler = proc_dointvec_minmax, 637 .extra1 = &minolduid, 638 .extra2 = &maxolduid, 639 }, 640 #ifdef CONFIG_S390 641 #ifdef CONFIG_MATHEMU 642 { 643 .procname = "ieee_emulation_warnings", 644 .data = &sysctl_ieee_emulation_warnings, 645 .maxlen = sizeof(int), 646 .mode = 0644, 647 .proc_handler = proc_dointvec, 648 }, 649 #endif 650 { 651 .procname = "userprocess_debug", 652 .data = &show_unhandled_signals, 653 .maxlen = sizeof(int), 654 .mode = 0644, 655 .proc_handler = proc_dointvec, 656 }, 657 #endif 658 { 659 .procname = "pid_max", 660 .data = &pid_max, 661 .maxlen = sizeof (int), 662 .mode = 0644, 663 .proc_handler = proc_dointvec_minmax, 664 .extra1 = &pid_max_min, 665 .extra2 = &pid_max_max, 666 }, 667 { 668 .procname = "panic_on_oops", 669 .data = &panic_on_oops, 670 .maxlen = sizeof(int), 671 .mode = 0644, 672 .proc_handler = proc_dointvec, 673 }, 674 #if defined CONFIG_PRINTK 675 { 676 .procname = "printk", 677 .data = &console_loglevel, 678 .maxlen = 4*sizeof(int), 679 .mode = 0644, 680 .proc_handler = proc_dointvec, 681 }, 682 { 683 .procname = "printk_ratelimit", 684 .data = &printk_ratelimit_state.interval, 685 .maxlen = sizeof(int), 686 .mode = 0644, 687 .proc_handler = proc_dointvec_jiffies, 688 }, 689 { 690 .procname = "printk_ratelimit_burst", 691 .data = &printk_ratelimit_state.burst, 692 .maxlen = sizeof(int), 693 .mode = 0644, 694 .proc_handler = proc_dointvec, 695 }, 696 { 697 .procname = "printk_delay", 698 .data = &printk_delay_msec, 699 .maxlen = sizeof(int), 700 .mode = 0644, 701 .proc_handler = proc_dointvec_minmax, 702 .extra1 = &zero, 703 .extra2 = &ten_thousand, 704 }, 705 { 706 .procname = "dmesg_restrict", 707 .data = &dmesg_restrict, 708 .maxlen = sizeof(int), 709 .mode = 0644, 710 .proc_handler = proc_dointvec_minmax, 711 .extra1 = &zero, 712 .extra2 = &one, 713 }, 714 { 715 .procname = "kptr_restrict", 716 .data = &kptr_restrict, 717 .maxlen = sizeof(int), 718 .mode = 0644, 719 .proc_handler = proc_dointvec_minmax, 720 .extra1 = &zero, 721 .extra2 = &two, 722 }, 723 #endif 724 { 725 .procname = "ngroups_max", 726 .data = &ngroups_max, 727 .maxlen = sizeof (int), 728 .mode = 0444, 729 .proc_handler = proc_dointvec, 730 }, 731 #if defined(CONFIG_LOCKUP_DETECTOR) 732 { 733 .procname = "watchdog", 734 .data = &watchdog_enabled, 735 .maxlen = sizeof (int), 736 .mode = 0644, 737 .proc_handler = proc_dowatchdog_enabled, 738 }, 739 { 740 .procname = "watchdog_thresh", 741 .data = &softlockup_thresh, 742 .maxlen = sizeof(int), 743 .mode = 0644, 744 .proc_handler = proc_dowatchdog_thresh, 745 .extra1 = &neg_one, 746 .extra2 = &sixty, 747 }, 748 { 749 .procname = "softlockup_panic", 750 .data = &softlockup_panic, 751 .maxlen = sizeof(int), 752 .mode = 0644, 753 .proc_handler = proc_dointvec_minmax, 754 .extra1 = &zero, 755 .extra2 = &one, 756 }, 757 { 758 .procname = "nmi_watchdog", 759 .data = &watchdog_enabled, 760 .maxlen = sizeof (int), 761 .mode = 0644, 762 .proc_handler = proc_dowatchdog_enabled, 763 }, 764 #endif 765 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 766 { 767 .procname = "unknown_nmi_panic", 768 .data = &unknown_nmi_panic, 769 .maxlen = sizeof (int), 770 .mode = 0644, 771 .proc_handler = proc_dointvec, 772 }, 773 #endif 774 #if defined(CONFIG_X86) 775 { 776 .procname = "panic_on_unrecovered_nmi", 777 .data = &panic_on_unrecovered_nmi, 778 .maxlen = sizeof(int), 779 .mode = 0644, 780 .proc_handler = proc_dointvec, 781 }, 782 { 783 .procname = "panic_on_io_nmi", 784 .data = &panic_on_io_nmi, 785 .maxlen = sizeof(int), 786 .mode = 0644, 787 .proc_handler = proc_dointvec, 788 }, 789 { 790 .procname = "bootloader_type", 791 .data = &bootloader_type, 792 .maxlen = sizeof (int), 793 .mode = 0444, 794 .proc_handler = proc_dointvec, 795 }, 796 { 797 .procname = "bootloader_version", 798 .data = &bootloader_version, 799 .maxlen = sizeof (int), 800 .mode = 0444, 801 .proc_handler = proc_dointvec, 802 }, 803 { 804 .procname = "kstack_depth_to_print", 805 .data = &kstack_depth_to_print, 806 .maxlen = sizeof(int), 807 .mode = 0644, 808 .proc_handler = proc_dointvec, 809 }, 810 { 811 .procname = "io_delay_type", 812 .data = &io_delay_type, 813 .maxlen = sizeof(int), 814 .mode = 0644, 815 .proc_handler = proc_dointvec, 816 }, 817 #endif 818 #if defined(CONFIG_MMU) 819 { 820 .procname = "randomize_va_space", 821 .data = &randomize_va_space, 822 .maxlen = sizeof(int), 823 .mode = 0644, 824 .proc_handler = proc_dointvec, 825 }, 826 #endif 827 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 828 { 829 .procname = "spin_retry", 830 .data = &spin_retry, 831 .maxlen = sizeof (int), 832 .mode = 0644, 833 .proc_handler = proc_dointvec, 834 }, 835 #endif 836 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 837 { 838 .procname = "acpi_video_flags", 839 .data = &acpi_realmode_flags, 840 .maxlen = sizeof (unsigned long), 841 .mode = 0644, 842 .proc_handler = proc_doulongvec_minmax, 843 }, 844 #endif 845 #ifdef CONFIG_IA64 846 { 847 .procname = "ignore-unaligned-usertrap", 848 .data = &no_unaligned_warning, 849 .maxlen = sizeof (int), 850 .mode = 0644, 851 .proc_handler = proc_dointvec, 852 }, 853 { 854 .procname = "unaligned-dump-stack", 855 .data = &unaligned_dump_stack, 856 .maxlen = sizeof (int), 857 .mode = 0644, 858 .proc_handler = proc_dointvec, 859 }, 860 #endif 861 #ifdef CONFIG_DETECT_HUNG_TASK 862 { 863 .procname = "hung_task_panic", 864 .data = &sysctl_hung_task_panic, 865 .maxlen = sizeof(int), 866 .mode = 0644, 867 .proc_handler = proc_dointvec_minmax, 868 .extra1 = &zero, 869 .extra2 = &one, 870 }, 871 { 872 .procname = "hung_task_check_count", 873 .data = &sysctl_hung_task_check_count, 874 .maxlen = sizeof(unsigned long), 875 .mode = 0644, 876 .proc_handler = proc_doulongvec_minmax, 877 }, 878 { 879 .procname = "hung_task_timeout_secs", 880 .data = &sysctl_hung_task_timeout_secs, 881 .maxlen = sizeof(unsigned long), 882 .mode = 0644, 883 .proc_handler = proc_dohung_task_timeout_secs, 884 }, 885 { 886 .procname = "hung_task_warnings", 887 .data = &sysctl_hung_task_warnings, 888 .maxlen = sizeof(unsigned long), 889 .mode = 0644, 890 .proc_handler = proc_doulongvec_minmax, 891 }, 892 #endif 893 #ifdef CONFIG_COMPAT 894 { 895 .procname = "compat-log", 896 .data = &compat_log, 897 .maxlen = sizeof (int), 898 .mode = 0644, 899 .proc_handler = proc_dointvec, 900 }, 901 #endif 902 #ifdef CONFIG_RT_MUTEXES 903 { 904 .procname = "max_lock_depth", 905 .data = &max_lock_depth, 906 .maxlen = sizeof(int), 907 .mode = 0644, 908 .proc_handler = proc_dointvec, 909 }, 910 #endif 911 { 912 .procname = "poweroff_cmd", 913 .data = &poweroff_cmd, 914 .maxlen = POWEROFF_CMD_PATH_LEN, 915 .mode = 0644, 916 .proc_handler = proc_dostring, 917 }, 918 #ifdef CONFIG_KEYS 919 { 920 .procname = "keys", 921 .mode = 0555, 922 .child = key_sysctls, 923 }, 924 #endif 925 #ifdef CONFIG_RCU_TORTURE_TEST 926 { 927 .procname = "rcutorture_runnable", 928 .data = &rcutorture_runnable, 929 .maxlen = sizeof(int), 930 .mode = 0644, 931 .proc_handler = proc_dointvec, 932 }, 933 #endif 934 #ifdef CONFIG_PERF_EVENTS 935 { 936 .procname = "perf_event_paranoid", 937 .data = &sysctl_perf_event_paranoid, 938 .maxlen = sizeof(sysctl_perf_event_paranoid), 939 .mode = 0644, 940 .proc_handler = proc_dointvec, 941 }, 942 { 943 .procname = "perf_event_mlock_kb", 944 .data = &sysctl_perf_event_mlock, 945 .maxlen = sizeof(sysctl_perf_event_mlock), 946 .mode = 0644, 947 .proc_handler = proc_dointvec, 948 }, 949 { 950 .procname = "perf_event_max_sample_rate", 951 .data = &sysctl_perf_event_sample_rate, 952 .maxlen = sizeof(sysctl_perf_event_sample_rate), 953 .mode = 0644, 954 .proc_handler = proc_dointvec, 955 }, 956 #endif 957 #ifdef CONFIG_KMEMCHECK 958 { 959 .procname = "kmemcheck", 960 .data = &kmemcheck_enabled, 961 .maxlen = sizeof(int), 962 .mode = 0644, 963 .proc_handler = proc_dointvec, 964 }, 965 #endif 966 #ifdef CONFIG_BLOCK 967 { 968 .procname = "blk_iopoll", 969 .data = &blk_iopoll_enabled, 970 .maxlen = sizeof(int), 971 .mode = 0644, 972 .proc_handler = proc_dointvec, 973 }, 974 #endif 975 /* 976 * NOTE: do not add new entries to this table unless you have read 977 * Documentation/sysctl/ctl_unnumbered.txt 978 */ 979 { } 980 }; 981 982 static struct ctl_table vm_table[] = { 983 { 984 .procname = "overcommit_memory", 985 .data = &sysctl_overcommit_memory, 986 .maxlen = sizeof(sysctl_overcommit_memory), 987 .mode = 0644, 988 .proc_handler = proc_dointvec, 989 }, 990 { 991 .procname = "panic_on_oom", 992 .data = &sysctl_panic_on_oom, 993 .maxlen = sizeof(sysctl_panic_on_oom), 994 .mode = 0644, 995 .proc_handler = proc_dointvec, 996 }, 997 { 998 .procname = "oom_kill_allocating_task", 999 .data = &sysctl_oom_kill_allocating_task, 1000 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1001 .mode = 0644, 1002 .proc_handler = proc_dointvec, 1003 }, 1004 { 1005 .procname = "oom_dump_tasks", 1006 .data = &sysctl_oom_dump_tasks, 1007 .maxlen = sizeof(sysctl_oom_dump_tasks), 1008 .mode = 0644, 1009 .proc_handler = proc_dointvec, 1010 }, 1011 { 1012 .procname = "overcommit_ratio", 1013 .data = &sysctl_overcommit_ratio, 1014 .maxlen = sizeof(sysctl_overcommit_ratio), 1015 .mode = 0644, 1016 .proc_handler = proc_dointvec, 1017 }, 1018 { 1019 .procname = "page-cluster", 1020 .data = &page_cluster, 1021 .maxlen = sizeof(int), 1022 .mode = 0644, 1023 .proc_handler = proc_dointvec, 1024 }, 1025 { 1026 .procname = "dirty_background_ratio", 1027 .data = &dirty_background_ratio, 1028 .maxlen = sizeof(dirty_background_ratio), 1029 .mode = 0644, 1030 .proc_handler = dirty_background_ratio_handler, 1031 .extra1 = &zero, 1032 .extra2 = &one_hundred, 1033 }, 1034 { 1035 .procname = "dirty_background_bytes", 1036 .data = &dirty_background_bytes, 1037 .maxlen = sizeof(dirty_background_bytes), 1038 .mode = 0644, 1039 .proc_handler = dirty_background_bytes_handler, 1040 .extra1 = &one_ul, 1041 }, 1042 { 1043 .procname = "dirty_ratio", 1044 .data = &vm_dirty_ratio, 1045 .maxlen = sizeof(vm_dirty_ratio), 1046 .mode = 0644, 1047 .proc_handler = dirty_ratio_handler, 1048 .extra1 = &zero, 1049 .extra2 = &one_hundred, 1050 }, 1051 { 1052 .procname = "dirty_bytes", 1053 .data = &vm_dirty_bytes, 1054 .maxlen = sizeof(vm_dirty_bytes), 1055 .mode = 0644, 1056 .proc_handler = dirty_bytes_handler, 1057 .extra1 = &dirty_bytes_min, 1058 }, 1059 { 1060 .procname = "dirty_writeback_centisecs", 1061 .data = &dirty_writeback_interval, 1062 .maxlen = sizeof(dirty_writeback_interval), 1063 .mode = 0644, 1064 .proc_handler = dirty_writeback_centisecs_handler, 1065 }, 1066 { 1067 .procname = "dirty_expire_centisecs", 1068 .data = &dirty_expire_interval, 1069 .maxlen = sizeof(dirty_expire_interval), 1070 .mode = 0644, 1071 .proc_handler = proc_dointvec, 1072 }, 1073 { 1074 .procname = "nr_pdflush_threads", 1075 .data = &nr_pdflush_threads, 1076 .maxlen = sizeof nr_pdflush_threads, 1077 .mode = 0444 /* read-only*/, 1078 .proc_handler = proc_dointvec, 1079 }, 1080 { 1081 .procname = "swappiness", 1082 .data = &vm_swappiness, 1083 .maxlen = sizeof(vm_swappiness), 1084 .mode = 0644, 1085 .proc_handler = proc_dointvec_minmax, 1086 .extra1 = &zero, 1087 .extra2 = &one_hundred, 1088 }, 1089 #ifdef CONFIG_HUGETLB_PAGE 1090 { 1091 .procname = "nr_hugepages", 1092 .data = NULL, 1093 .maxlen = sizeof(unsigned long), 1094 .mode = 0644, 1095 .proc_handler = hugetlb_sysctl_handler, 1096 .extra1 = (void *)&hugetlb_zero, 1097 .extra2 = (void *)&hugetlb_infinity, 1098 }, 1099 #ifdef CONFIG_NUMA 1100 { 1101 .procname = "nr_hugepages_mempolicy", 1102 .data = NULL, 1103 .maxlen = sizeof(unsigned long), 1104 .mode = 0644, 1105 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1106 .extra1 = (void *)&hugetlb_zero, 1107 .extra2 = (void *)&hugetlb_infinity, 1108 }, 1109 #endif 1110 { 1111 .procname = "hugetlb_shm_group", 1112 .data = &sysctl_hugetlb_shm_group, 1113 .maxlen = sizeof(gid_t), 1114 .mode = 0644, 1115 .proc_handler = proc_dointvec, 1116 }, 1117 { 1118 .procname = "hugepages_treat_as_movable", 1119 .data = &hugepages_treat_as_movable, 1120 .maxlen = sizeof(int), 1121 .mode = 0644, 1122 .proc_handler = hugetlb_treat_movable_handler, 1123 }, 1124 { 1125 .procname = "nr_overcommit_hugepages", 1126 .data = NULL, 1127 .maxlen = sizeof(unsigned long), 1128 .mode = 0644, 1129 .proc_handler = hugetlb_overcommit_handler, 1130 .extra1 = (void *)&hugetlb_zero, 1131 .extra2 = (void *)&hugetlb_infinity, 1132 }, 1133 #endif 1134 { 1135 .procname = "lowmem_reserve_ratio", 1136 .data = &sysctl_lowmem_reserve_ratio, 1137 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1138 .mode = 0644, 1139 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1140 }, 1141 { 1142 .procname = "drop_caches", 1143 .data = &sysctl_drop_caches, 1144 .maxlen = sizeof(int), 1145 .mode = 0644, 1146 .proc_handler = drop_caches_sysctl_handler, 1147 }, 1148 #ifdef CONFIG_COMPACTION 1149 { 1150 .procname = "compact_memory", 1151 .data = &sysctl_compact_memory, 1152 .maxlen = sizeof(int), 1153 .mode = 0200, 1154 .proc_handler = sysctl_compaction_handler, 1155 }, 1156 { 1157 .procname = "extfrag_threshold", 1158 .data = &sysctl_extfrag_threshold, 1159 .maxlen = sizeof(int), 1160 .mode = 0644, 1161 .proc_handler = sysctl_extfrag_handler, 1162 .extra1 = &min_extfrag_threshold, 1163 .extra2 = &max_extfrag_threshold, 1164 }, 1165 1166 #endif /* CONFIG_COMPACTION */ 1167 { 1168 .procname = "min_free_kbytes", 1169 .data = &min_free_kbytes, 1170 .maxlen = sizeof(min_free_kbytes), 1171 .mode = 0644, 1172 .proc_handler = min_free_kbytes_sysctl_handler, 1173 .extra1 = &zero, 1174 }, 1175 { 1176 .procname = "percpu_pagelist_fraction", 1177 .data = &percpu_pagelist_fraction, 1178 .maxlen = sizeof(percpu_pagelist_fraction), 1179 .mode = 0644, 1180 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1181 .extra1 = &min_percpu_pagelist_fract, 1182 }, 1183 #ifdef CONFIG_MMU 1184 { 1185 .procname = "max_map_count", 1186 .data = &sysctl_max_map_count, 1187 .maxlen = sizeof(sysctl_max_map_count), 1188 .mode = 0644, 1189 .proc_handler = proc_dointvec_minmax, 1190 .extra1 = &zero, 1191 }, 1192 #else 1193 { 1194 .procname = "nr_trim_pages", 1195 .data = &sysctl_nr_trim_pages, 1196 .maxlen = sizeof(sysctl_nr_trim_pages), 1197 .mode = 0644, 1198 .proc_handler = proc_dointvec_minmax, 1199 .extra1 = &zero, 1200 }, 1201 #endif 1202 { 1203 .procname = "laptop_mode", 1204 .data = &laptop_mode, 1205 .maxlen = sizeof(laptop_mode), 1206 .mode = 0644, 1207 .proc_handler = proc_dointvec_jiffies, 1208 }, 1209 { 1210 .procname = "block_dump", 1211 .data = &block_dump, 1212 .maxlen = sizeof(block_dump), 1213 .mode = 0644, 1214 .proc_handler = proc_dointvec, 1215 .extra1 = &zero, 1216 }, 1217 { 1218 .procname = "vfs_cache_pressure", 1219 .data = &sysctl_vfs_cache_pressure, 1220 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1221 .mode = 0644, 1222 .proc_handler = proc_dointvec, 1223 .extra1 = &zero, 1224 }, 1225 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1226 { 1227 .procname = "legacy_va_layout", 1228 .data = &sysctl_legacy_va_layout, 1229 .maxlen = sizeof(sysctl_legacy_va_layout), 1230 .mode = 0644, 1231 .proc_handler = proc_dointvec, 1232 .extra1 = &zero, 1233 }, 1234 #endif 1235 #ifdef CONFIG_NUMA 1236 { 1237 .procname = "zone_reclaim_mode", 1238 .data = &zone_reclaim_mode, 1239 .maxlen = sizeof(zone_reclaim_mode), 1240 .mode = 0644, 1241 .proc_handler = proc_dointvec, 1242 .extra1 = &zero, 1243 }, 1244 { 1245 .procname = "min_unmapped_ratio", 1246 .data = &sysctl_min_unmapped_ratio, 1247 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1248 .mode = 0644, 1249 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1250 .extra1 = &zero, 1251 .extra2 = &one_hundred, 1252 }, 1253 { 1254 .procname = "min_slab_ratio", 1255 .data = &sysctl_min_slab_ratio, 1256 .maxlen = sizeof(sysctl_min_slab_ratio), 1257 .mode = 0644, 1258 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1259 .extra1 = &zero, 1260 .extra2 = &one_hundred, 1261 }, 1262 #endif 1263 #ifdef CONFIG_SMP 1264 { 1265 .procname = "stat_interval", 1266 .data = &sysctl_stat_interval, 1267 .maxlen = sizeof(sysctl_stat_interval), 1268 .mode = 0644, 1269 .proc_handler = proc_dointvec_jiffies, 1270 }, 1271 #endif 1272 #ifdef CONFIG_MMU 1273 { 1274 .procname = "mmap_min_addr", 1275 .data = &dac_mmap_min_addr, 1276 .maxlen = sizeof(unsigned long), 1277 .mode = 0644, 1278 .proc_handler = mmap_min_addr_handler, 1279 }, 1280 #endif 1281 #ifdef CONFIG_NUMA 1282 { 1283 .procname = "numa_zonelist_order", 1284 .data = &numa_zonelist_order, 1285 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1286 .mode = 0644, 1287 .proc_handler = numa_zonelist_order_handler, 1288 }, 1289 #endif 1290 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1291 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1292 { 1293 .procname = "vdso_enabled", 1294 .data = &vdso_enabled, 1295 .maxlen = sizeof(vdso_enabled), 1296 .mode = 0644, 1297 .proc_handler = proc_dointvec, 1298 .extra1 = &zero, 1299 }, 1300 #endif 1301 #ifdef CONFIG_HIGHMEM 1302 { 1303 .procname = "highmem_is_dirtyable", 1304 .data = &vm_highmem_is_dirtyable, 1305 .maxlen = sizeof(vm_highmem_is_dirtyable), 1306 .mode = 0644, 1307 .proc_handler = proc_dointvec_minmax, 1308 .extra1 = &zero, 1309 .extra2 = &one, 1310 }, 1311 #endif 1312 { 1313 .procname = "scan_unevictable_pages", 1314 .data = &scan_unevictable_pages, 1315 .maxlen = sizeof(scan_unevictable_pages), 1316 .mode = 0644, 1317 .proc_handler = scan_unevictable_handler, 1318 }, 1319 #ifdef CONFIG_MEMORY_FAILURE 1320 { 1321 .procname = "memory_failure_early_kill", 1322 .data = &sysctl_memory_failure_early_kill, 1323 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1324 .mode = 0644, 1325 .proc_handler = proc_dointvec_minmax, 1326 .extra1 = &zero, 1327 .extra2 = &one, 1328 }, 1329 { 1330 .procname = "memory_failure_recovery", 1331 .data = &sysctl_memory_failure_recovery, 1332 .maxlen = sizeof(sysctl_memory_failure_recovery), 1333 .mode = 0644, 1334 .proc_handler = proc_dointvec_minmax, 1335 .extra1 = &zero, 1336 .extra2 = &one, 1337 }, 1338 #endif 1339 1340 /* 1341 * NOTE: do not add new entries to this table unless you have read 1342 * Documentation/sysctl/ctl_unnumbered.txt 1343 */ 1344 { } 1345 }; 1346 1347 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1348 static struct ctl_table binfmt_misc_table[] = { 1349 { } 1350 }; 1351 #endif 1352 1353 static struct ctl_table fs_table[] = { 1354 { 1355 .procname = "inode-nr", 1356 .data = &inodes_stat, 1357 .maxlen = 2*sizeof(int), 1358 .mode = 0444, 1359 .proc_handler = proc_nr_inodes, 1360 }, 1361 { 1362 .procname = "inode-state", 1363 .data = &inodes_stat, 1364 .maxlen = 7*sizeof(int), 1365 .mode = 0444, 1366 .proc_handler = proc_nr_inodes, 1367 }, 1368 { 1369 .procname = "file-nr", 1370 .data = &files_stat, 1371 .maxlen = sizeof(files_stat), 1372 .mode = 0444, 1373 .proc_handler = proc_nr_files, 1374 }, 1375 { 1376 .procname = "file-max", 1377 .data = &files_stat.max_files, 1378 .maxlen = sizeof(files_stat.max_files), 1379 .mode = 0644, 1380 .proc_handler = proc_doulongvec_minmax, 1381 }, 1382 { 1383 .procname = "nr_open", 1384 .data = &sysctl_nr_open, 1385 .maxlen = sizeof(int), 1386 .mode = 0644, 1387 .proc_handler = proc_dointvec_minmax, 1388 .extra1 = &sysctl_nr_open_min, 1389 .extra2 = &sysctl_nr_open_max, 1390 }, 1391 { 1392 .procname = "dentry-state", 1393 .data = &dentry_stat, 1394 .maxlen = 6*sizeof(int), 1395 .mode = 0444, 1396 .proc_handler = proc_nr_dentry, 1397 }, 1398 { 1399 .procname = "overflowuid", 1400 .data = &fs_overflowuid, 1401 .maxlen = sizeof(int), 1402 .mode = 0644, 1403 .proc_handler = proc_dointvec_minmax, 1404 .extra1 = &minolduid, 1405 .extra2 = &maxolduid, 1406 }, 1407 { 1408 .procname = "overflowgid", 1409 .data = &fs_overflowgid, 1410 .maxlen = sizeof(int), 1411 .mode = 0644, 1412 .proc_handler = proc_dointvec_minmax, 1413 .extra1 = &minolduid, 1414 .extra2 = &maxolduid, 1415 }, 1416 #ifdef CONFIG_FILE_LOCKING 1417 { 1418 .procname = "leases-enable", 1419 .data = &leases_enable, 1420 .maxlen = sizeof(int), 1421 .mode = 0644, 1422 .proc_handler = proc_dointvec, 1423 }, 1424 #endif 1425 #ifdef CONFIG_DNOTIFY 1426 { 1427 .procname = "dir-notify-enable", 1428 .data = &dir_notify_enable, 1429 .maxlen = sizeof(int), 1430 .mode = 0644, 1431 .proc_handler = proc_dointvec, 1432 }, 1433 #endif 1434 #ifdef CONFIG_MMU 1435 #ifdef CONFIG_FILE_LOCKING 1436 { 1437 .procname = "lease-break-time", 1438 .data = &lease_break_time, 1439 .maxlen = sizeof(int), 1440 .mode = 0644, 1441 .proc_handler = proc_dointvec, 1442 }, 1443 #endif 1444 #ifdef CONFIG_AIO 1445 { 1446 .procname = "aio-nr", 1447 .data = &aio_nr, 1448 .maxlen = sizeof(aio_nr), 1449 .mode = 0444, 1450 .proc_handler = proc_doulongvec_minmax, 1451 }, 1452 { 1453 .procname = "aio-max-nr", 1454 .data = &aio_max_nr, 1455 .maxlen = sizeof(aio_max_nr), 1456 .mode = 0644, 1457 .proc_handler = proc_doulongvec_minmax, 1458 }, 1459 #endif /* CONFIG_AIO */ 1460 #ifdef CONFIG_INOTIFY_USER 1461 { 1462 .procname = "inotify", 1463 .mode = 0555, 1464 .child = inotify_table, 1465 }, 1466 #endif 1467 #ifdef CONFIG_EPOLL 1468 { 1469 .procname = "epoll", 1470 .mode = 0555, 1471 .child = epoll_table, 1472 }, 1473 #endif 1474 #endif 1475 { 1476 .procname = "suid_dumpable", 1477 .data = &suid_dumpable, 1478 .maxlen = sizeof(int), 1479 .mode = 0644, 1480 .proc_handler = proc_dointvec_minmax, 1481 .extra1 = &zero, 1482 .extra2 = &two, 1483 }, 1484 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1485 { 1486 .procname = "binfmt_misc", 1487 .mode = 0555, 1488 .child = binfmt_misc_table, 1489 }, 1490 #endif 1491 { 1492 .procname = "pipe-max-size", 1493 .data = &pipe_max_size, 1494 .maxlen = sizeof(int), 1495 .mode = 0644, 1496 .proc_handler = &pipe_proc_fn, 1497 .extra1 = &pipe_min_size, 1498 }, 1499 /* 1500 * NOTE: do not add new entries to this table unless you have read 1501 * Documentation/sysctl/ctl_unnumbered.txt 1502 */ 1503 { } 1504 }; 1505 1506 static struct ctl_table debug_table[] = { 1507 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1508 defined(CONFIG_S390) 1509 { 1510 .procname = "exception-trace", 1511 .data = &show_unhandled_signals, 1512 .maxlen = sizeof(int), 1513 .mode = 0644, 1514 .proc_handler = proc_dointvec 1515 }, 1516 #endif 1517 #if defined(CONFIG_OPTPROBES) 1518 { 1519 .procname = "kprobes-optimization", 1520 .data = &sysctl_kprobes_optimization, 1521 .maxlen = sizeof(int), 1522 .mode = 0644, 1523 .proc_handler = proc_kprobes_optimization_handler, 1524 .extra1 = &zero, 1525 .extra2 = &one, 1526 }, 1527 #endif 1528 { } 1529 }; 1530 1531 static struct ctl_table dev_table[] = { 1532 { } 1533 }; 1534 1535 static DEFINE_SPINLOCK(sysctl_lock); 1536 1537 /* called under sysctl_lock */ 1538 static int use_table(struct ctl_table_header *p) 1539 { 1540 if (unlikely(p->unregistering)) 1541 return 0; 1542 p->used++; 1543 return 1; 1544 } 1545 1546 /* called under sysctl_lock */ 1547 static void unuse_table(struct ctl_table_header *p) 1548 { 1549 if (!--p->used) 1550 if (unlikely(p->unregistering)) 1551 complete(p->unregistering); 1552 } 1553 1554 /* called under sysctl_lock, will reacquire if has to wait */ 1555 static void start_unregistering(struct ctl_table_header *p) 1556 { 1557 /* 1558 * if p->used is 0, nobody will ever touch that entry again; 1559 * we'll eliminate all paths to it before dropping sysctl_lock 1560 */ 1561 if (unlikely(p->used)) { 1562 struct completion wait; 1563 init_completion(&wait); 1564 p->unregistering = &wait; 1565 spin_unlock(&sysctl_lock); 1566 wait_for_completion(&wait); 1567 spin_lock(&sysctl_lock); 1568 } else { 1569 /* anything non-NULL; we'll never dereference it */ 1570 p->unregistering = ERR_PTR(-EINVAL); 1571 } 1572 /* 1573 * do not remove from the list until nobody holds it; walking the 1574 * list in do_sysctl() relies on that. 1575 */ 1576 list_del_init(&p->ctl_entry); 1577 } 1578 1579 void sysctl_head_get(struct ctl_table_header *head) 1580 { 1581 spin_lock(&sysctl_lock); 1582 head->count++; 1583 spin_unlock(&sysctl_lock); 1584 } 1585 1586 void sysctl_head_put(struct ctl_table_header *head) 1587 { 1588 spin_lock(&sysctl_lock); 1589 if (!--head->count) 1590 kfree(head); 1591 spin_unlock(&sysctl_lock); 1592 } 1593 1594 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1595 { 1596 if (!head) 1597 BUG(); 1598 spin_lock(&sysctl_lock); 1599 if (!use_table(head)) 1600 head = ERR_PTR(-ENOENT); 1601 spin_unlock(&sysctl_lock); 1602 return head; 1603 } 1604 1605 void sysctl_head_finish(struct ctl_table_header *head) 1606 { 1607 if (!head) 1608 return; 1609 spin_lock(&sysctl_lock); 1610 unuse_table(head); 1611 spin_unlock(&sysctl_lock); 1612 } 1613 1614 static struct ctl_table_set * 1615 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1616 { 1617 struct ctl_table_set *set = &root->default_set; 1618 if (root->lookup) 1619 set = root->lookup(root, namespaces); 1620 return set; 1621 } 1622 1623 static struct list_head * 1624 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1625 { 1626 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1627 return &set->list; 1628 } 1629 1630 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1631 struct ctl_table_header *prev) 1632 { 1633 struct ctl_table_root *root; 1634 struct list_head *header_list; 1635 struct ctl_table_header *head; 1636 struct list_head *tmp; 1637 1638 spin_lock(&sysctl_lock); 1639 if (prev) { 1640 head = prev; 1641 tmp = &prev->ctl_entry; 1642 unuse_table(prev); 1643 goto next; 1644 } 1645 tmp = &root_table_header.ctl_entry; 1646 for (;;) { 1647 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1648 1649 if (!use_table(head)) 1650 goto next; 1651 spin_unlock(&sysctl_lock); 1652 return head; 1653 next: 1654 root = head->root; 1655 tmp = tmp->next; 1656 header_list = lookup_header_list(root, namespaces); 1657 if (tmp != header_list) 1658 continue; 1659 1660 do { 1661 root = list_entry(root->root_list.next, 1662 struct ctl_table_root, root_list); 1663 if (root == &sysctl_table_root) 1664 goto out; 1665 header_list = lookup_header_list(root, namespaces); 1666 } while (list_empty(header_list)); 1667 tmp = header_list->next; 1668 } 1669 out: 1670 spin_unlock(&sysctl_lock); 1671 return NULL; 1672 } 1673 1674 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1675 { 1676 return __sysctl_head_next(current->nsproxy, prev); 1677 } 1678 1679 void register_sysctl_root(struct ctl_table_root *root) 1680 { 1681 spin_lock(&sysctl_lock); 1682 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1683 spin_unlock(&sysctl_lock); 1684 } 1685 1686 /* 1687 * sysctl_perm does NOT grant the superuser all rights automatically, because 1688 * some sysctl variables are readonly even to root. 1689 */ 1690 1691 static int test_perm(int mode, int op) 1692 { 1693 if (!current_euid()) 1694 mode >>= 6; 1695 else if (in_egroup_p(0)) 1696 mode >>= 3; 1697 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1698 return 0; 1699 return -EACCES; 1700 } 1701 1702 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1703 { 1704 int error; 1705 int mode; 1706 1707 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1708 if (error) 1709 return error; 1710 1711 if (root->permissions) 1712 mode = root->permissions(root, current->nsproxy, table); 1713 else 1714 mode = table->mode; 1715 1716 return test_perm(mode, op); 1717 } 1718 1719 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1720 { 1721 for (; table->procname; table++) { 1722 table->parent = parent; 1723 if (table->child) 1724 sysctl_set_parent(table, table->child); 1725 } 1726 } 1727 1728 static __init int sysctl_init(void) 1729 { 1730 sysctl_set_parent(NULL, root_table); 1731 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1732 sysctl_check_table(current->nsproxy, root_table); 1733 #endif 1734 return 0; 1735 } 1736 1737 core_initcall(sysctl_init); 1738 1739 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1740 struct ctl_table *table) 1741 { 1742 struct ctl_table *p; 1743 const char *s = branch->procname; 1744 1745 /* branch should have named subdirectory as its first element */ 1746 if (!s || !branch->child) 1747 return NULL; 1748 1749 /* ... and nothing else */ 1750 if (branch[1].procname) 1751 return NULL; 1752 1753 /* table should contain subdirectory with the same name */ 1754 for (p = table; p->procname; p++) { 1755 if (!p->child) 1756 continue; 1757 if (p->procname && strcmp(p->procname, s) == 0) 1758 return p; 1759 } 1760 return NULL; 1761 } 1762 1763 /* see if attaching q to p would be an improvement */ 1764 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1765 { 1766 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1767 struct ctl_table *next; 1768 int is_better = 0; 1769 int not_in_parent = !p->attached_by; 1770 1771 while ((next = is_branch_in(by, to)) != NULL) { 1772 if (by == q->attached_by) 1773 is_better = 1; 1774 if (to == p->attached_by) 1775 not_in_parent = 1; 1776 by = by->child; 1777 to = next->child; 1778 } 1779 1780 if (is_better && not_in_parent) { 1781 q->attached_by = by; 1782 q->attached_to = to; 1783 q->parent = p; 1784 } 1785 } 1786 1787 /** 1788 * __register_sysctl_paths - register a sysctl hierarchy 1789 * @root: List of sysctl headers to register on 1790 * @namespaces: Data to compute which lists of sysctl entries are visible 1791 * @path: The path to the directory the sysctl table is in. 1792 * @table: the top-level table structure 1793 * 1794 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1795 * array. A completely 0 filled entry terminates the table. 1796 * 1797 * The members of the &struct ctl_table structure are used as follows: 1798 * 1799 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1800 * enter a sysctl file 1801 * 1802 * data - a pointer to data for use by proc_handler 1803 * 1804 * maxlen - the maximum size in bytes of the data 1805 * 1806 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1807 * 1808 * child - a pointer to the child sysctl table if this entry is a directory, or 1809 * %NULL. 1810 * 1811 * proc_handler - the text handler routine (described below) 1812 * 1813 * de - for internal use by the sysctl routines 1814 * 1815 * extra1, extra2 - extra pointers usable by the proc handler routines 1816 * 1817 * Leaf nodes in the sysctl tree will be represented by a single file 1818 * under /proc; non-leaf nodes will be represented by directories. 1819 * 1820 * sysctl(2) can automatically manage read and write requests through 1821 * the sysctl table. The data and maxlen fields of the ctl_table 1822 * struct enable minimal validation of the values being written to be 1823 * performed, and the mode field allows minimal authentication. 1824 * 1825 * There must be a proc_handler routine for any terminal nodes 1826 * mirrored under /proc/sys (non-terminals are handled by a built-in 1827 * directory handler). Several default handlers are available to 1828 * cover common cases - 1829 * 1830 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1831 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1832 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1833 * 1834 * It is the handler's job to read the input buffer from user memory 1835 * and process it. The handler should return 0 on success. 1836 * 1837 * This routine returns %NULL on a failure to register, and a pointer 1838 * to the table header on success. 1839 */ 1840 struct ctl_table_header *__register_sysctl_paths( 1841 struct ctl_table_root *root, 1842 struct nsproxy *namespaces, 1843 const struct ctl_path *path, struct ctl_table *table) 1844 { 1845 struct ctl_table_header *header; 1846 struct ctl_table *new, **prevp; 1847 unsigned int n, npath; 1848 struct ctl_table_set *set; 1849 1850 /* Count the path components */ 1851 for (npath = 0; path[npath].procname; ++npath) 1852 ; 1853 1854 /* 1855 * For each path component, allocate a 2-element ctl_table array. 1856 * The first array element will be filled with the sysctl entry 1857 * for this, the second will be the sentinel (procname == 0). 1858 * 1859 * We allocate everything in one go so that we don't have to 1860 * worry about freeing additional memory in unregister_sysctl_table. 1861 */ 1862 header = kzalloc(sizeof(struct ctl_table_header) + 1863 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1864 if (!header) 1865 return NULL; 1866 1867 new = (struct ctl_table *) (header + 1); 1868 1869 /* Now connect the dots */ 1870 prevp = &header->ctl_table; 1871 for (n = 0; n < npath; ++n, ++path) { 1872 /* Copy the procname */ 1873 new->procname = path->procname; 1874 new->mode = 0555; 1875 1876 *prevp = new; 1877 prevp = &new->child; 1878 1879 new += 2; 1880 } 1881 *prevp = table; 1882 header->ctl_table_arg = table; 1883 1884 INIT_LIST_HEAD(&header->ctl_entry); 1885 header->used = 0; 1886 header->unregistering = NULL; 1887 header->root = root; 1888 sysctl_set_parent(NULL, header->ctl_table); 1889 header->count = 1; 1890 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1891 if (sysctl_check_table(namespaces, header->ctl_table)) { 1892 kfree(header); 1893 return NULL; 1894 } 1895 #endif 1896 spin_lock(&sysctl_lock); 1897 header->set = lookup_header_set(root, namespaces); 1898 header->attached_by = header->ctl_table; 1899 header->attached_to = root_table; 1900 header->parent = &root_table_header; 1901 for (set = header->set; set; set = set->parent) { 1902 struct ctl_table_header *p; 1903 list_for_each_entry(p, &set->list, ctl_entry) { 1904 if (p->unregistering) 1905 continue; 1906 try_attach(p, header); 1907 } 1908 } 1909 header->parent->count++; 1910 list_add_tail(&header->ctl_entry, &header->set->list); 1911 spin_unlock(&sysctl_lock); 1912 1913 return header; 1914 } 1915 1916 /** 1917 * register_sysctl_table_path - register a sysctl table hierarchy 1918 * @path: The path to the directory the sysctl table is in. 1919 * @table: the top-level table structure 1920 * 1921 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1922 * array. A completely 0 filled entry terminates the table. 1923 * 1924 * See __register_sysctl_paths for more details. 1925 */ 1926 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1927 struct ctl_table *table) 1928 { 1929 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1930 path, table); 1931 } 1932 1933 /** 1934 * register_sysctl_table - register a sysctl table hierarchy 1935 * @table: the top-level table structure 1936 * 1937 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1938 * array. A completely 0 filled entry terminates the table. 1939 * 1940 * See register_sysctl_paths for more details. 1941 */ 1942 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1943 { 1944 static const struct ctl_path null_path[] = { {} }; 1945 1946 return register_sysctl_paths(null_path, table); 1947 } 1948 1949 /** 1950 * unregister_sysctl_table - unregister a sysctl table hierarchy 1951 * @header: the header returned from register_sysctl_table 1952 * 1953 * Unregisters the sysctl table and all children. proc entries may not 1954 * actually be removed until they are no longer used by anyone. 1955 */ 1956 void unregister_sysctl_table(struct ctl_table_header * header) 1957 { 1958 might_sleep(); 1959 1960 if (header == NULL) 1961 return; 1962 1963 spin_lock(&sysctl_lock); 1964 start_unregistering(header); 1965 if (!--header->parent->count) { 1966 WARN_ON(1); 1967 kfree(header->parent); 1968 } 1969 if (!--header->count) 1970 kfree(header); 1971 spin_unlock(&sysctl_lock); 1972 } 1973 1974 int sysctl_is_seen(struct ctl_table_header *p) 1975 { 1976 struct ctl_table_set *set = p->set; 1977 int res; 1978 spin_lock(&sysctl_lock); 1979 if (p->unregistering) 1980 res = 0; 1981 else if (!set->is_seen) 1982 res = 1; 1983 else 1984 res = set->is_seen(set); 1985 spin_unlock(&sysctl_lock); 1986 return res; 1987 } 1988 1989 void setup_sysctl_set(struct ctl_table_set *p, 1990 struct ctl_table_set *parent, 1991 int (*is_seen)(struct ctl_table_set *)) 1992 { 1993 INIT_LIST_HEAD(&p->list); 1994 p->parent = parent ? parent : &sysctl_table_root.default_set; 1995 p->is_seen = is_seen; 1996 } 1997 1998 #else /* !CONFIG_SYSCTL */ 1999 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2000 { 2001 return NULL; 2002 } 2003 2004 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2005 struct ctl_table *table) 2006 { 2007 return NULL; 2008 } 2009 2010 void unregister_sysctl_table(struct ctl_table_header * table) 2011 { 2012 } 2013 2014 void setup_sysctl_set(struct ctl_table_set *p, 2015 struct ctl_table_set *parent, 2016 int (*is_seen)(struct ctl_table_set *)) 2017 { 2018 } 2019 2020 void sysctl_head_put(struct ctl_table_header *head) 2021 { 2022 } 2023 2024 #endif /* CONFIG_SYSCTL */ 2025 2026 /* 2027 * /proc/sys support 2028 */ 2029 2030 #ifdef CONFIG_PROC_SYSCTL 2031 2032 static int _proc_do_string(void* data, int maxlen, int write, 2033 void __user *buffer, 2034 size_t *lenp, loff_t *ppos) 2035 { 2036 size_t len; 2037 char __user *p; 2038 char c; 2039 2040 if (!data || !maxlen || !*lenp) { 2041 *lenp = 0; 2042 return 0; 2043 } 2044 2045 if (write) { 2046 len = 0; 2047 p = buffer; 2048 while (len < *lenp) { 2049 if (get_user(c, p++)) 2050 return -EFAULT; 2051 if (c == 0 || c == '\n') 2052 break; 2053 len++; 2054 } 2055 if (len >= maxlen) 2056 len = maxlen-1; 2057 if(copy_from_user(data, buffer, len)) 2058 return -EFAULT; 2059 ((char *) data)[len] = 0; 2060 *ppos += *lenp; 2061 } else { 2062 len = strlen(data); 2063 if (len > maxlen) 2064 len = maxlen; 2065 2066 if (*ppos > len) { 2067 *lenp = 0; 2068 return 0; 2069 } 2070 2071 data += *ppos; 2072 len -= *ppos; 2073 2074 if (len > *lenp) 2075 len = *lenp; 2076 if (len) 2077 if(copy_to_user(buffer, data, len)) 2078 return -EFAULT; 2079 if (len < *lenp) { 2080 if(put_user('\n', ((char __user *) buffer) + len)) 2081 return -EFAULT; 2082 len++; 2083 } 2084 *lenp = len; 2085 *ppos += len; 2086 } 2087 return 0; 2088 } 2089 2090 /** 2091 * proc_dostring - read a string sysctl 2092 * @table: the sysctl table 2093 * @write: %TRUE if this is a write to the sysctl file 2094 * @buffer: the user buffer 2095 * @lenp: the size of the user buffer 2096 * @ppos: file position 2097 * 2098 * Reads/writes a string from/to the user buffer. If the kernel 2099 * buffer provided is not large enough to hold the string, the 2100 * string is truncated. The copied string is %NULL-terminated. 2101 * If the string is being read by the user process, it is copied 2102 * and a newline '\n' is added. It is truncated if the buffer is 2103 * not large enough. 2104 * 2105 * Returns 0 on success. 2106 */ 2107 int proc_dostring(struct ctl_table *table, int write, 2108 void __user *buffer, size_t *lenp, loff_t *ppos) 2109 { 2110 return _proc_do_string(table->data, table->maxlen, write, 2111 buffer, lenp, ppos); 2112 } 2113 2114 static size_t proc_skip_spaces(char **buf) 2115 { 2116 size_t ret; 2117 char *tmp = skip_spaces(*buf); 2118 ret = tmp - *buf; 2119 *buf = tmp; 2120 return ret; 2121 } 2122 2123 static void proc_skip_char(char **buf, size_t *size, const char v) 2124 { 2125 while (*size) { 2126 if (**buf != v) 2127 break; 2128 (*size)--; 2129 (*buf)++; 2130 } 2131 } 2132 2133 #define TMPBUFLEN 22 2134 /** 2135 * proc_get_long - reads an ASCII formatted integer from a user buffer 2136 * 2137 * @buf: a kernel buffer 2138 * @size: size of the kernel buffer 2139 * @val: this is where the number will be stored 2140 * @neg: set to %TRUE if number is negative 2141 * @perm_tr: a vector which contains the allowed trailers 2142 * @perm_tr_len: size of the perm_tr vector 2143 * @tr: pointer to store the trailer character 2144 * 2145 * In case of success %0 is returned and @buf and @size are updated with 2146 * the amount of bytes read. If @tr is non-NULL and a trailing 2147 * character exists (size is non-zero after returning from this 2148 * function), @tr is updated with the trailing character. 2149 */ 2150 static int proc_get_long(char **buf, size_t *size, 2151 unsigned long *val, bool *neg, 2152 const char *perm_tr, unsigned perm_tr_len, char *tr) 2153 { 2154 int len; 2155 char *p, tmp[TMPBUFLEN]; 2156 2157 if (!*size) 2158 return -EINVAL; 2159 2160 len = *size; 2161 if (len > TMPBUFLEN - 1) 2162 len = TMPBUFLEN - 1; 2163 2164 memcpy(tmp, *buf, len); 2165 2166 tmp[len] = 0; 2167 p = tmp; 2168 if (*p == '-' && *size > 1) { 2169 *neg = true; 2170 p++; 2171 } else 2172 *neg = false; 2173 if (!isdigit(*p)) 2174 return -EINVAL; 2175 2176 *val = simple_strtoul(p, &p, 0); 2177 2178 len = p - tmp; 2179 2180 /* We don't know if the next char is whitespace thus we may accept 2181 * invalid integers (e.g. 1234...a) or two integers instead of one 2182 * (e.g. 123...1). So lets not allow such large numbers. */ 2183 if (len == TMPBUFLEN - 1) 2184 return -EINVAL; 2185 2186 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2187 return -EINVAL; 2188 2189 if (tr && (len < *size)) 2190 *tr = *p; 2191 2192 *buf += len; 2193 *size -= len; 2194 2195 return 0; 2196 } 2197 2198 /** 2199 * proc_put_long - converts an integer to a decimal ASCII formatted string 2200 * 2201 * @buf: the user buffer 2202 * @size: the size of the user buffer 2203 * @val: the integer to be converted 2204 * @neg: sign of the number, %TRUE for negative 2205 * 2206 * In case of success %0 is returned and @buf and @size are updated with 2207 * the amount of bytes written. 2208 */ 2209 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2210 bool neg) 2211 { 2212 int len; 2213 char tmp[TMPBUFLEN], *p = tmp; 2214 2215 sprintf(p, "%s%lu", neg ? "-" : "", val); 2216 len = strlen(tmp); 2217 if (len > *size) 2218 len = *size; 2219 if (copy_to_user(*buf, tmp, len)) 2220 return -EFAULT; 2221 *size -= len; 2222 *buf += len; 2223 return 0; 2224 } 2225 #undef TMPBUFLEN 2226 2227 static int proc_put_char(void __user **buf, size_t *size, char c) 2228 { 2229 if (*size) { 2230 char __user **buffer = (char __user **)buf; 2231 if (put_user(c, *buffer)) 2232 return -EFAULT; 2233 (*size)--, (*buffer)++; 2234 *buf = *buffer; 2235 } 2236 return 0; 2237 } 2238 2239 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2240 int *valp, 2241 int write, void *data) 2242 { 2243 if (write) { 2244 *valp = *negp ? -*lvalp : *lvalp; 2245 } else { 2246 int val = *valp; 2247 if (val < 0) { 2248 *negp = true; 2249 *lvalp = (unsigned long)-val; 2250 } else { 2251 *negp = false; 2252 *lvalp = (unsigned long)val; 2253 } 2254 } 2255 return 0; 2256 } 2257 2258 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2259 2260 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2261 int write, void __user *buffer, 2262 size_t *lenp, loff_t *ppos, 2263 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2264 int write, void *data), 2265 void *data) 2266 { 2267 int *i, vleft, first = 1, err = 0; 2268 unsigned long page = 0; 2269 size_t left; 2270 char *kbuf; 2271 2272 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2273 *lenp = 0; 2274 return 0; 2275 } 2276 2277 i = (int *) tbl_data; 2278 vleft = table->maxlen / sizeof(*i); 2279 left = *lenp; 2280 2281 if (!conv) 2282 conv = do_proc_dointvec_conv; 2283 2284 if (write) { 2285 if (left > PAGE_SIZE - 1) 2286 left = PAGE_SIZE - 1; 2287 page = __get_free_page(GFP_TEMPORARY); 2288 kbuf = (char *) page; 2289 if (!kbuf) 2290 return -ENOMEM; 2291 if (copy_from_user(kbuf, buffer, left)) { 2292 err = -EFAULT; 2293 goto free; 2294 } 2295 kbuf[left] = 0; 2296 } 2297 2298 for (; left && vleft--; i++, first=0) { 2299 unsigned long lval; 2300 bool neg; 2301 2302 if (write) { 2303 left -= proc_skip_spaces(&kbuf); 2304 2305 if (!left) 2306 break; 2307 err = proc_get_long(&kbuf, &left, &lval, &neg, 2308 proc_wspace_sep, 2309 sizeof(proc_wspace_sep), NULL); 2310 if (err) 2311 break; 2312 if (conv(&neg, &lval, i, 1, data)) { 2313 err = -EINVAL; 2314 break; 2315 } 2316 } else { 2317 if (conv(&neg, &lval, i, 0, data)) { 2318 err = -EINVAL; 2319 break; 2320 } 2321 if (!first) 2322 err = proc_put_char(&buffer, &left, '\t'); 2323 if (err) 2324 break; 2325 err = proc_put_long(&buffer, &left, lval, neg); 2326 if (err) 2327 break; 2328 } 2329 } 2330 2331 if (!write && !first && left && !err) 2332 err = proc_put_char(&buffer, &left, '\n'); 2333 if (write && !err && left) 2334 left -= proc_skip_spaces(&kbuf); 2335 free: 2336 if (write) { 2337 free_page(page); 2338 if (first) 2339 return err ? : -EINVAL; 2340 } 2341 *lenp -= left; 2342 *ppos += *lenp; 2343 return err; 2344 } 2345 2346 static int do_proc_dointvec(struct ctl_table *table, int write, 2347 void __user *buffer, size_t *lenp, loff_t *ppos, 2348 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2349 int write, void *data), 2350 void *data) 2351 { 2352 return __do_proc_dointvec(table->data, table, write, 2353 buffer, lenp, ppos, conv, data); 2354 } 2355 2356 /** 2357 * proc_dointvec - read a vector of integers 2358 * @table: the sysctl table 2359 * @write: %TRUE if this is a write to the sysctl file 2360 * @buffer: the user buffer 2361 * @lenp: the size of the user buffer 2362 * @ppos: file position 2363 * 2364 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2365 * values from/to the user buffer, treated as an ASCII string. 2366 * 2367 * Returns 0 on success. 2368 */ 2369 int proc_dointvec(struct ctl_table *table, int write, 2370 void __user *buffer, size_t *lenp, loff_t *ppos) 2371 { 2372 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2373 NULL,NULL); 2374 } 2375 2376 /* 2377 * Taint values can only be increased 2378 * This means we can safely use a temporary. 2379 */ 2380 static int proc_taint(struct ctl_table *table, int write, 2381 void __user *buffer, size_t *lenp, loff_t *ppos) 2382 { 2383 struct ctl_table t; 2384 unsigned long tmptaint = get_taint(); 2385 int err; 2386 2387 if (write && !capable(CAP_SYS_ADMIN)) 2388 return -EPERM; 2389 2390 t = *table; 2391 t.data = &tmptaint; 2392 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2393 if (err < 0) 2394 return err; 2395 2396 if (write) { 2397 /* 2398 * Poor man's atomic or. Not worth adding a primitive 2399 * to everyone's atomic.h for this 2400 */ 2401 int i; 2402 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2403 if ((tmptaint >> i) & 1) 2404 add_taint(i); 2405 } 2406 } 2407 2408 return err; 2409 } 2410 2411 struct do_proc_dointvec_minmax_conv_param { 2412 int *min; 2413 int *max; 2414 }; 2415 2416 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2417 int *valp, 2418 int write, void *data) 2419 { 2420 struct do_proc_dointvec_minmax_conv_param *param = data; 2421 if (write) { 2422 int val = *negp ? -*lvalp : *lvalp; 2423 if ((param->min && *param->min > val) || 2424 (param->max && *param->max < val)) 2425 return -EINVAL; 2426 *valp = val; 2427 } else { 2428 int val = *valp; 2429 if (val < 0) { 2430 *negp = true; 2431 *lvalp = (unsigned long)-val; 2432 } else { 2433 *negp = false; 2434 *lvalp = (unsigned long)val; 2435 } 2436 } 2437 return 0; 2438 } 2439 2440 /** 2441 * proc_dointvec_minmax - read a vector of integers with min/max values 2442 * @table: the sysctl table 2443 * @write: %TRUE if this is a write to the sysctl file 2444 * @buffer: the user buffer 2445 * @lenp: the size of the user buffer 2446 * @ppos: file position 2447 * 2448 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2449 * values from/to the user buffer, treated as an ASCII string. 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_dointvec_minmax(struct ctl_table *table, int write, 2457 void __user *buffer, size_t *lenp, loff_t *ppos) 2458 { 2459 struct do_proc_dointvec_minmax_conv_param param = { 2460 .min = (int *) table->extra1, 2461 .max = (int *) table->extra2, 2462 }; 2463 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2464 do_proc_dointvec_minmax_conv, ¶m); 2465 } 2466 2467 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2468 void __user *buffer, 2469 size_t *lenp, loff_t *ppos, 2470 unsigned long convmul, 2471 unsigned long convdiv) 2472 { 2473 unsigned long *i, *min, *max; 2474 int vleft, first = 1, err = 0; 2475 unsigned long page = 0; 2476 size_t left; 2477 char *kbuf; 2478 2479 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2480 *lenp = 0; 2481 return 0; 2482 } 2483 2484 i = (unsigned long *) data; 2485 min = (unsigned long *) table->extra1; 2486 max = (unsigned long *) table->extra2; 2487 vleft = table->maxlen / sizeof(unsigned long); 2488 left = *lenp; 2489 2490 if (write) { 2491 if (left > PAGE_SIZE - 1) 2492 left = PAGE_SIZE - 1; 2493 page = __get_free_page(GFP_TEMPORARY); 2494 kbuf = (char *) page; 2495 if (!kbuf) 2496 return -ENOMEM; 2497 if (copy_from_user(kbuf, buffer, left)) { 2498 err = -EFAULT; 2499 goto free; 2500 } 2501 kbuf[left] = 0; 2502 } 2503 2504 for (; left && vleft--; i++, first = 0) { 2505 unsigned long val; 2506 2507 if (write) { 2508 bool neg; 2509 2510 left -= proc_skip_spaces(&kbuf); 2511 2512 err = proc_get_long(&kbuf, &left, &val, &neg, 2513 proc_wspace_sep, 2514 sizeof(proc_wspace_sep), NULL); 2515 if (err) 2516 break; 2517 if (neg) 2518 continue; 2519 if ((min && val < *min) || (max && val > *max)) 2520 continue; 2521 *i = val; 2522 } else { 2523 val = convdiv * (*i) / convmul; 2524 if (!first) 2525 err = proc_put_char(&buffer, &left, '\t'); 2526 err = proc_put_long(&buffer, &left, val, false); 2527 if (err) 2528 break; 2529 } 2530 } 2531 2532 if (!write && !first && left && !err) 2533 err = proc_put_char(&buffer, &left, '\n'); 2534 if (write && !err) 2535 left -= proc_skip_spaces(&kbuf); 2536 free: 2537 if (write) { 2538 free_page(page); 2539 if (first) 2540 return err ? : -EINVAL; 2541 } 2542 *lenp -= left; 2543 *ppos += *lenp; 2544 return err; 2545 } 2546 2547 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2548 void __user *buffer, 2549 size_t *lenp, loff_t *ppos, 2550 unsigned long convmul, 2551 unsigned long convdiv) 2552 { 2553 return __do_proc_doulongvec_minmax(table->data, table, write, 2554 buffer, lenp, ppos, convmul, convdiv); 2555 } 2556 2557 /** 2558 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2559 * @table: the sysctl table 2560 * @write: %TRUE if this is a write to the sysctl file 2561 * @buffer: the user buffer 2562 * @lenp: the size of the user buffer 2563 * @ppos: file position 2564 * 2565 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2566 * values from/to the user buffer, treated as an ASCII string. 2567 * 2568 * This routine will ensure the values are within the range specified by 2569 * table->extra1 (min) and table->extra2 (max). 2570 * 2571 * Returns 0 on success. 2572 */ 2573 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2574 void __user *buffer, size_t *lenp, loff_t *ppos) 2575 { 2576 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2577 } 2578 2579 /** 2580 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2581 * @table: the sysctl table 2582 * @write: %TRUE if this is a write to the sysctl file 2583 * @buffer: the user buffer 2584 * @lenp: the size of the user buffer 2585 * @ppos: file position 2586 * 2587 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2588 * values from/to the user buffer, treated as an ASCII string. The values 2589 * are treated as milliseconds, and converted to jiffies when they are stored. 2590 * 2591 * This routine will ensure the values are within the range specified by 2592 * table->extra1 (min) and table->extra2 (max). 2593 * 2594 * Returns 0 on success. 2595 */ 2596 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2597 void __user *buffer, 2598 size_t *lenp, loff_t *ppos) 2599 { 2600 return do_proc_doulongvec_minmax(table, write, buffer, 2601 lenp, ppos, HZ, 1000l); 2602 } 2603 2604 2605 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2606 int *valp, 2607 int write, void *data) 2608 { 2609 if (write) { 2610 if (*lvalp > LONG_MAX / HZ) 2611 return 1; 2612 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2613 } else { 2614 int val = *valp; 2615 unsigned long lval; 2616 if (val < 0) { 2617 *negp = true; 2618 lval = (unsigned long)-val; 2619 } else { 2620 *negp = false; 2621 lval = (unsigned long)val; 2622 } 2623 *lvalp = lval / HZ; 2624 } 2625 return 0; 2626 } 2627 2628 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2629 int *valp, 2630 int write, void *data) 2631 { 2632 if (write) { 2633 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2634 return 1; 2635 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2636 } else { 2637 int val = *valp; 2638 unsigned long lval; 2639 if (val < 0) { 2640 *negp = true; 2641 lval = (unsigned long)-val; 2642 } else { 2643 *negp = false; 2644 lval = (unsigned long)val; 2645 } 2646 *lvalp = jiffies_to_clock_t(lval); 2647 } 2648 return 0; 2649 } 2650 2651 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2652 int *valp, 2653 int write, void *data) 2654 { 2655 if (write) { 2656 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2657 } else { 2658 int val = *valp; 2659 unsigned long lval; 2660 if (val < 0) { 2661 *negp = true; 2662 lval = (unsigned long)-val; 2663 } else { 2664 *negp = false; 2665 lval = (unsigned long)val; 2666 } 2667 *lvalp = jiffies_to_msecs(lval); 2668 } 2669 return 0; 2670 } 2671 2672 /** 2673 * proc_dointvec_jiffies - read a vector of integers as seconds 2674 * @table: the sysctl table 2675 * @write: %TRUE if this is a write to the sysctl file 2676 * @buffer: the user buffer 2677 * @lenp: the size of the user buffer 2678 * @ppos: file position 2679 * 2680 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2681 * values from/to the user buffer, treated as an ASCII string. 2682 * The values read are assumed to be in seconds, and are converted into 2683 * jiffies. 2684 * 2685 * Returns 0 on success. 2686 */ 2687 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2688 void __user *buffer, size_t *lenp, loff_t *ppos) 2689 { 2690 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2691 do_proc_dointvec_jiffies_conv,NULL); 2692 } 2693 2694 /** 2695 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2696 * @table: the sysctl table 2697 * @write: %TRUE if this is a write to the sysctl file 2698 * @buffer: the user buffer 2699 * @lenp: the size of the user buffer 2700 * @ppos: pointer to the file position 2701 * 2702 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2703 * values from/to the user buffer, treated as an ASCII string. 2704 * The values read are assumed to be in 1/USER_HZ seconds, and 2705 * are converted into jiffies. 2706 * 2707 * Returns 0 on success. 2708 */ 2709 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2710 void __user *buffer, size_t *lenp, loff_t *ppos) 2711 { 2712 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2713 do_proc_dointvec_userhz_jiffies_conv,NULL); 2714 } 2715 2716 /** 2717 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2718 * @table: the sysctl table 2719 * @write: %TRUE if this is a write to the sysctl file 2720 * @buffer: the user buffer 2721 * @lenp: the size of the user buffer 2722 * @ppos: file position 2723 * @ppos: the current position in the file 2724 * 2725 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2726 * values from/to the user buffer, treated as an ASCII string. 2727 * The values read are assumed to be in 1/1000 seconds, and 2728 * are converted into jiffies. 2729 * 2730 * Returns 0 on success. 2731 */ 2732 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2733 void __user *buffer, size_t *lenp, loff_t *ppos) 2734 { 2735 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2736 do_proc_dointvec_ms_jiffies_conv, NULL); 2737 } 2738 2739 static int proc_do_cad_pid(struct ctl_table *table, int write, 2740 void __user *buffer, size_t *lenp, loff_t *ppos) 2741 { 2742 struct pid *new_pid; 2743 pid_t tmp; 2744 int r; 2745 2746 tmp = pid_vnr(cad_pid); 2747 2748 r = __do_proc_dointvec(&tmp, table, write, buffer, 2749 lenp, ppos, NULL, NULL); 2750 if (r || !write) 2751 return r; 2752 2753 new_pid = find_get_pid(tmp); 2754 if (!new_pid) 2755 return -ESRCH; 2756 2757 put_pid(xchg(&cad_pid, new_pid)); 2758 return 0; 2759 } 2760 2761 /** 2762 * proc_do_large_bitmap - read/write from/to a large bitmap 2763 * @table: the sysctl table 2764 * @write: %TRUE if this is a write to the sysctl file 2765 * @buffer: the user buffer 2766 * @lenp: the size of the user buffer 2767 * @ppos: file position 2768 * 2769 * The bitmap is stored at table->data and the bitmap length (in bits) 2770 * in table->maxlen. 2771 * 2772 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2773 * large bitmaps may be represented in a compact manner. Writing into 2774 * the file will clear the bitmap then update it with the given input. 2775 * 2776 * Returns 0 on success. 2777 */ 2778 int proc_do_large_bitmap(struct ctl_table *table, int write, 2779 void __user *buffer, size_t *lenp, loff_t *ppos) 2780 { 2781 int err = 0; 2782 bool first = 1; 2783 size_t left = *lenp; 2784 unsigned long bitmap_len = table->maxlen; 2785 unsigned long *bitmap = (unsigned long *) table->data; 2786 unsigned long *tmp_bitmap = NULL; 2787 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2788 2789 if (!bitmap_len || !left || (*ppos && !write)) { 2790 *lenp = 0; 2791 return 0; 2792 } 2793 2794 if (write) { 2795 unsigned long page = 0; 2796 char *kbuf; 2797 2798 if (left > PAGE_SIZE - 1) 2799 left = PAGE_SIZE - 1; 2800 2801 page = __get_free_page(GFP_TEMPORARY); 2802 kbuf = (char *) page; 2803 if (!kbuf) 2804 return -ENOMEM; 2805 if (copy_from_user(kbuf, buffer, left)) { 2806 free_page(page); 2807 return -EFAULT; 2808 } 2809 kbuf[left] = 0; 2810 2811 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2812 GFP_KERNEL); 2813 if (!tmp_bitmap) { 2814 free_page(page); 2815 return -ENOMEM; 2816 } 2817 proc_skip_char(&kbuf, &left, '\n'); 2818 while (!err && left) { 2819 unsigned long val_a, val_b; 2820 bool neg; 2821 2822 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2823 sizeof(tr_a), &c); 2824 if (err) 2825 break; 2826 if (val_a >= bitmap_len || neg) { 2827 err = -EINVAL; 2828 break; 2829 } 2830 2831 val_b = val_a; 2832 if (left) { 2833 kbuf++; 2834 left--; 2835 } 2836 2837 if (c == '-') { 2838 err = proc_get_long(&kbuf, &left, &val_b, 2839 &neg, tr_b, sizeof(tr_b), 2840 &c); 2841 if (err) 2842 break; 2843 if (val_b >= bitmap_len || neg || 2844 val_a > val_b) { 2845 err = -EINVAL; 2846 break; 2847 } 2848 if (left) { 2849 kbuf++; 2850 left--; 2851 } 2852 } 2853 2854 while (val_a <= val_b) 2855 set_bit(val_a++, tmp_bitmap); 2856 2857 first = 0; 2858 proc_skip_char(&kbuf, &left, '\n'); 2859 } 2860 free_page(page); 2861 } else { 2862 unsigned long bit_a, bit_b = 0; 2863 2864 while (left) { 2865 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2866 if (bit_a >= bitmap_len) 2867 break; 2868 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2869 bit_a + 1) - 1; 2870 2871 if (!first) { 2872 err = proc_put_char(&buffer, &left, ','); 2873 if (err) 2874 break; 2875 } 2876 err = proc_put_long(&buffer, &left, bit_a, false); 2877 if (err) 2878 break; 2879 if (bit_a != bit_b) { 2880 err = proc_put_char(&buffer, &left, '-'); 2881 if (err) 2882 break; 2883 err = proc_put_long(&buffer, &left, bit_b, false); 2884 if (err) 2885 break; 2886 } 2887 2888 first = 0; bit_b++; 2889 } 2890 if (!err) 2891 err = proc_put_char(&buffer, &left, '\n'); 2892 } 2893 2894 if (!err) { 2895 if (write) { 2896 if (*ppos) 2897 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2898 else 2899 memcpy(bitmap, tmp_bitmap, 2900 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2901 } 2902 kfree(tmp_bitmap); 2903 *lenp -= left; 2904 *ppos += *lenp; 2905 return 0; 2906 } else { 2907 kfree(tmp_bitmap); 2908 return err; 2909 } 2910 } 2911 2912 #else /* CONFIG_PROC_FS */ 2913 2914 int proc_dostring(struct ctl_table *table, int write, 2915 void __user *buffer, size_t *lenp, loff_t *ppos) 2916 { 2917 return -ENOSYS; 2918 } 2919 2920 int proc_dointvec(struct ctl_table *table, int write, 2921 void __user *buffer, size_t *lenp, loff_t *ppos) 2922 { 2923 return -ENOSYS; 2924 } 2925 2926 int proc_dointvec_minmax(struct ctl_table *table, int write, 2927 void __user *buffer, size_t *lenp, loff_t *ppos) 2928 { 2929 return -ENOSYS; 2930 } 2931 2932 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2933 void __user *buffer, size_t *lenp, loff_t *ppos) 2934 { 2935 return -ENOSYS; 2936 } 2937 2938 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2939 void __user *buffer, size_t *lenp, loff_t *ppos) 2940 { 2941 return -ENOSYS; 2942 } 2943 2944 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2945 void __user *buffer, size_t *lenp, loff_t *ppos) 2946 { 2947 return -ENOSYS; 2948 } 2949 2950 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2951 void __user *buffer, size_t *lenp, loff_t *ppos) 2952 { 2953 return -ENOSYS; 2954 } 2955 2956 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2957 void __user *buffer, 2958 size_t *lenp, loff_t *ppos) 2959 { 2960 return -ENOSYS; 2961 } 2962 2963 2964 #endif /* CONFIG_PROC_FS */ 2965 2966 /* 2967 * No sense putting this after each symbol definition, twice, 2968 * exception granted :-) 2969 */ 2970 EXPORT_SYMBOL(proc_dointvec); 2971 EXPORT_SYMBOL(proc_dointvec_jiffies); 2972 EXPORT_SYMBOL(proc_dointvec_minmax); 2973 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2974 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2975 EXPORT_SYMBOL(proc_dostring); 2976 EXPORT_SYMBOL(proc_doulongvec_minmax); 2977 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2978 EXPORT_SYMBOL(register_sysctl_table); 2979 EXPORT_SYMBOL(register_sysctl_paths); 2980 EXPORT_SYMBOL(unregister_sysctl_table); 2981