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/compaction.h> 41 #include <linux/hugetlb.h> 42 #include <linux/initrd.h> 43 #include <linux/key.h> 44 #include <linux/times.h> 45 #include <linux/limits.h> 46 #include <linux/dcache.h> 47 #include <linux/dnotify.h> 48 #include <linux/syscalls.h> 49 #include <linux/vmstat.h> 50 #include <linux/nfs_fs.h> 51 #include <linux/acpi.h> 52 #include <linux/reboot.h> 53 #include <linux/ftrace.h> 54 #include <linux/perf_event.h> 55 #include <linux/kprobes.h> 56 #include <linux/pipe_fs_i.h> 57 #include <linux/oom.h> 58 59 #include <asm/uaccess.h> 60 #include <asm/processor.h> 61 62 #ifdef CONFIG_X86 63 #include <asm/nmi.h> 64 #include <asm/stacktrace.h> 65 #include <asm/io.h> 66 #endif 67 #ifdef CONFIG_BSD_PROCESS_ACCT 68 #include <linux/acct.h> 69 #endif 70 #ifdef CONFIG_RT_MUTEXES 71 #include <linux/rtmutex.h> 72 #endif 73 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 74 #include <linux/lockdep.h> 75 #endif 76 #ifdef CONFIG_CHR_DEV_SG 77 #include <scsi/sg.h> 78 #endif 79 80 #ifdef CONFIG_LOCKUP_DETECTOR 81 #include <linux/nmi.h> 82 #endif 83 84 85 #if defined(CONFIG_SYSCTL) 86 87 /* External variables not in a header file. */ 88 extern int sysctl_overcommit_memory; 89 extern int sysctl_overcommit_ratio; 90 extern int max_threads; 91 extern int core_uses_pid; 92 extern int suid_dumpable; 93 extern char core_pattern[]; 94 extern unsigned int core_pipe_limit; 95 extern int pid_max; 96 extern int min_free_kbytes; 97 extern int pid_max_min, pid_max_max; 98 extern int sysctl_drop_caches; 99 extern int percpu_pagelist_fraction; 100 extern int compat_log; 101 extern int latencytop_enabled; 102 extern int sysctl_nr_open_min, sysctl_nr_open_max; 103 #ifndef CONFIG_MMU 104 extern int sysctl_nr_trim_pages; 105 #endif 106 #ifdef CONFIG_BLOCK 107 extern int blk_iopoll_enabled; 108 #endif 109 110 /* Constants used for minimum and maximum */ 111 #ifdef CONFIG_LOCKUP_DETECTOR 112 static int sixty = 60; 113 static int neg_one = -1; 114 #endif 115 116 static int zero; 117 static int __maybe_unused one = 1; 118 static int __maybe_unused two = 2; 119 static unsigned long one_ul = 1; 120 static int one_hundred = 100; 121 #ifdef CONFIG_PRINTK 122 static int ten_thousand = 10000; 123 #endif 124 125 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 126 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 127 128 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 129 static int maxolduid = 65535; 130 static int minolduid; 131 static int min_percpu_pagelist_fract = 8; 132 133 static int ngroups_max = NGROUPS_MAX; 134 135 #ifdef CONFIG_INOTIFY_USER 136 #include <linux/inotify.h> 137 #endif 138 #ifdef CONFIG_SPARC 139 #include <asm/system.h> 140 #endif 141 142 #ifdef CONFIG_SPARC64 143 extern int sysctl_tsb_ratio; 144 #endif 145 146 #ifdef __hppa__ 147 extern int pwrsw_enabled; 148 extern int unaligned_enabled; 149 #endif 150 151 #ifdef CONFIG_S390 152 #ifdef CONFIG_MATHEMU 153 extern int sysctl_ieee_emulation_warnings; 154 #endif 155 extern int sysctl_userprocess_debug; 156 extern int spin_retry; 157 #endif 158 159 #ifdef CONFIG_IA64 160 extern int no_unaligned_warning; 161 extern int unaligned_dump_stack; 162 #endif 163 164 #ifdef CONFIG_PROC_SYSCTL 165 static int proc_do_cad_pid(struct ctl_table *table, int write, 166 void __user *buffer, size_t *lenp, loff_t *ppos); 167 static int proc_taint(struct ctl_table *table, int write, 168 void __user *buffer, size_t *lenp, loff_t *ppos); 169 #endif 170 171 #ifdef CONFIG_MAGIC_SYSRQ 172 static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */ 173 174 static int sysrq_sysctl_handler(ctl_table *table, int write, 175 void __user *buffer, size_t *lenp, 176 loff_t *ppos) 177 { 178 int error; 179 180 error = proc_dointvec(table, write, buffer, lenp, ppos); 181 if (error) 182 return error; 183 184 if (write) 185 sysrq_toggle_support(__sysrq_enabled); 186 187 return 0; 188 } 189 190 #endif 191 192 static struct ctl_table root_table[]; 193 static struct ctl_table_root sysctl_table_root; 194 static struct ctl_table_header root_table_header = { 195 .count = 1, 196 .ctl_table = root_table, 197 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 198 .root = &sysctl_table_root, 199 .set = &sysctl_table_root.default_set, 200 }; 201 static struct ctl_table_root sysctl_table_root = { 202 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 203 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 204 }; 205 206 static struct ctl_table kern_table[]; 207 static struct ctl_table vm_table[]; 208 static struct ctl_table fs_table[]; 209 static struct ctl_table debug_table[]; 210 static struct ctl_table dev_table[]; 211 extern struct ctl_table random_table[]; 212 #ifdef CONFIG_EPOLL 213 extern struct ctl_table epoll_table[]; 214 #endif 215 216 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 217 int sysctl_legacy_va_layout; 218 #endif 219 220 /* The default sysctl tables: */ 221 222 static struct ctl_table root_table[] = { 223 { 224 .procname = "kernel", 225 .mode = 0555, 226 .child = kern_table, 227 }, 228 { 229 .procname = "vm", 230 .mode = 0555, 231 .child = vm_table, 232 }, 233 { 234 .procname = "fs", 235 .mode = 0555, 236 .child = fs_table, 237 }, 238 { 239 .procname = "debug", 240 .mode = 0555, 241 .child = debug_table, 242 }, 243 { 244 .procname = "dev", 245 .mode = 0555, 246 .child = dev_table, 247 }, 248 /* 249 * NOTE: do not add new entries to this table unless you have read 250 * Documentation/sysctl/ctl_unnumbered.txt 251 */ 252 { } 253 }; 254 255 #ifdef CONFIG_SCHED_DEBUG 256 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 257 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 258 static int min_wakeup_granularity_ns; /* 0 usecs */ 259 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 260 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 261 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 262 #endif 263 264 #ifdef CONFIG_COMPACTION 265 static int min_extfrag_threshold; 266 static int max_extfrag_threshold = 1000; 267 #endif 268 269 static struct ctl_table kern_table[] = { 270 { 271 .procname = "sched_child_runs_first", 272 .data = &sysctl_sched_child_runs_first, 273 .maxlen = sizeof(unsigned int), 274 .mode = 0644, 275 .proc_handler = proc_dointvec, 276 }, 277 #ifdef CONFIG_SCHED_DEBUG 278 { 279 .procname = "sched_min_granularity_ns", 280 .data = &sysctl_sched_min_granularity, 281 .maxlen = sizeof(unsigned int), 282 .mode = 0644, 283 .proc_handler = sched_proc_update_handler, 284 .extra1 = &min_sched_granularity_ns, 285 .extra2 = &max_sched_granularity_ns, 286 }, 287 { 288 .procname = "sched_latency_ns", 289 .data = &sysctl_sched_latency, 290 .maxlen = sizeof(unsigned int), 291 .mode = 0644, 292 .proc_handler = sched_proc_update_handler, 293 .extra1 = &min_sched_granularity_ns, 294 .extra2 = &max_sched_granularity_ns, 295 }, 296 { 297 .procname = "sched_wakeup_granularity_ns", 298 .data = &sysctl_sched_wakeup_granularity, 299 .maxlen = sizeof(unsigned int), 300 .mode = 0644, 301 .proc_handler = sched_proc_update_handler, 302 .extra1 = &min_wakeup_granularity_ns, 303 .extra2 = &max_wakeup_granularity_ns, 304 }, 305 { 306 .procname = "sched_tunable_scaling", 307 .data = &sysctl_sched_tunable_scaling, 308 .maxlen = sizeof(enum sched_tunable_scaling), 309 .mode = 0644, 310 .proc_handler = sched_proc_update_handler, 311 .extra1 = &min_sched_tunable_scaling, 312 .extra2 = &max_sched_tunable_scaling, 313 }, 314 { 315 .procname = "sched_migration_cost", 316 .data = &sysctl_sched_migration_cost, 317 .maxlen = sizeof(unsigned int), 318 .mode = 0644, 319 .proc_handler = proc_dointvec, 320 }, 321 { 322 .procname = "sched_nr_migrate", 323 .data = &sysctl_sched_nr_migrate, 324 .maxlen = sizeof(unsigned int), 325 .mode = 0644, 326 .proc_handler = proc_dointvec, 327 }, 328 { 329 .procname = "sched_time_avg", 330 .data = &sysctl_sched_time_avg, 331 .maxlen = sizeof(unsigned int), 332 .mode = 0644, 333 .proc_handler = proc_dointvec, 334 }, 335 { 336 .procname = "sched_shares_window", 337 .data = &sysctl_sched_shares_window, 338 .maxlen = sizeof(unsigned int), 339 .mode = 0644, 340 .proc_handler = proc_dointvec, 341 }, 342 { 343 .procname = "timer_migration", 344 .data = &sysctl_timer_migration, 345 .maxlen = sizeof(unsigned int), 346 .mode = 0644, 347 .proc_handler = proc_dointvec_minmax, 348 .extra1 = &zero, 349 .extra2 = &one, 350 }, 351 #endif 352 { 353 .procname = "sched_rt_period_us", 354 .data = &sysctl_sched_rt_period, 355 .maxlen = sizeof(unsigned int), 356 .mode = 0644, 357 .proc_handler = sched_rt_handler, 358 }, 359 { 360 .procname = "sched_rt_runtime_us", 361 .data = &sysctl_sched_rt_runtime, 362 .maxlen = sizeof(int), 363 .mode = 0644, 364 .proc_handler = sched_rt_handler, 365 }, 366 { 367 .procname = "sched_compat_yield", 368 .data = &sysctl_sched_compat_yield, 369 .maxlen = sizeof(unsigned int), 370 .mode = 0644, 371 .proc_handler = proc_dointvec, 372 }, 373 #ifdef CONFIG_SCHED_AUTOGROUP 374 { 375 .procname = "sched_autogroup_enabled", 376 .data = &sysctl_sched_autogroup_enabled, 377 .maxlen = sizeof(unsigned int), 378 .mode = 0644, 379 .proc_handler = proc_dointvec, 380 .extra1 = &zero, 381 .extra2 = &one, 382 }, 383 #endif 384 #ifdef CONFIG_PROVE_LOCKING 385 { 386 .procname = "prove_locking", 387 .data = &prove_locking, 388 .maxlen = sizeof(int), 389 .mode = 0644, 390 .proc_handler = proc_dointvec, 391 }, 392 #endif 393 #ifdef CONFIG_LOCK_STAT 394 { 395 .procname = "lock_stat", 396 .data = &lock_stat, 397 .maxlen = sizeof(int), 398 .mode = 0644, 399 .proc_handler = proc_dointvec, 400 }, 401 #endif 402 { 403 .procname = "panic", 404 .data = &panic_timeout, 405 .maxlen = sizeof(int), 406 .mode = 0644, 407 .proc_handler = proc_dointvec, 408 }, 409 { 410 .procname = "core_uses_pid", 411 .data = &core_uses_pid, 412 .maxlen = sizeof(int), 413 .mode = 0644, 414 .proc_handler = proc_dointvec, 415 }, 416 { 417 .procname = "core_pattern", 418 .data = core_pattern, 419 .maxlen = CORENAME_MAX_SIZE, 420 .mode = 0644, 421 .proc_handler = proc_dostring, 422 }, 423 { 424 .procname = "core_pipe_limit", 425 .data = &core_pipe_limit, 426 .maxlen = sizeof(unsigned int), 427 .mode = 0644, 428 .proc_handler = proc_dointvec, 429 }, 430 #ifdef CONFIG_PROC_SYSCTL 431 { 432 .procname = "tainted", 433 .maxlen = sizeof(long), 434 .mode = 0644, 435 .proc_handler = proc_taint, 436 }, 437 #endif 438 #ifdef CONFIG_LATENCYTOP 439 { 440 .procname = "latencytop", 441 .data = &latencytop_enabled, 442 .maxlen = sizeof(int), 443 .mode = 0644, 444 .proc_handler = proc_dointvec, 445 }, 446 #endif 447 #ifdef CONFIG_BLK_DEV_INITRD 448 { 449 .procname = "real-root-dev", 450 .data = &real_root_dev, 451 .maxlen = sizeof(int), 452 .mode = 0644, 453 .proc_handler = proc_dointvec, 454 }, 455 #endif 456 { 457 .procname = "print-fatal-signals", 458 .data = &print_fatal_signals, 459 .maxlen = sizeof(int), 460 .mode = 0644, 461 .proc_handler = proc_dointvec, 462 }, 463 #ifdef CONFIG_SPARC 464 { 465 .procname = "reboot-cmd", 466 .data = reboot_command, 467 .maxlen = 256, 468 .mode = 0644, 469 .proc_handler = proc_dostring, 470 }, 471 { 472 .procname = "stop-a", 473 .data = &stop_a_enabled, 474 .maxlen = sizeof (int), 475 .mode = 0644, 476 .proc_handler = proc_dointvec, 477 }, 478 { 479 .procname = "scons-poweroff", 480 .data = &scons_pwroff, 481 .maxlen = sizeof (int), 482 .mode = 0644, 483 .proc_handler = proc_dointvec, 484 }, 485 #endif 486 #ifdef CONFIG_SPARC64 487 { 488 .procname = "tsb-ratio", 489 .data = &sysctl_tsb_ratio, 490 .maxlen = sizeof (int), 491 .mode = 0644, 492 .proc_handler = proc_dointvec, 493 }, 494 #endif 495 #ifdef __hppa__ 496 { 497 .procname = "soft-power", 498 .data = &pwrsw_enabled, 499 .maxlen = sizeof (int), 500 .mode = 0644, 501 .proc_handler = proc_dointvec, 502 }, 503 { 504 .procname = "unaligned-trap", 505 .data = &unaligned_enabled, 506 .maxlen = sizeof (int), 507 .mode = 0644, 508 .proc_handler = proc_dointvec, 509 }, 510 #endif 511 { 512 .procname = "ctrl-alt-del", 513 .data = &C_A_D, 514 .maxlen = sizeof(int), 515 .mode = 0644, 516 .proc_handler = proc_dointvec, 517 }, 518 #ifdef CONFIG_FUNCTION_TRACER 519 { 520 .procname = "ftrace_enabled", 521 .data = &ftrace_enabled, 522 .maxlen = sizeof(int), 523 .mode = 0644, 524 .proc_handler = ftrace_enable_sysctl, 525 }, 526 #endif 527 #ifdef CONFIG_STACK_TRACER 528 { 529 .procname = "stack_tracer_enabled", 530 .data = &stack_tracer_enabled, 531 .maxlen = sizeof(int), 532 .mode = 0644, 533 .proc_handler = stack_trace_sysctl, 534 }, 535 #endif 536 #ifdef CONFIG_TRACING 537 { 538 .procname = "ftrace_dump_on_oops", 539 .data = &ftrace_dump_on_oops, 540 .maxlen = sizeof(int), 541 .mode = 0644, 542 .proc_handler = proc_dointvec, 543 }, 544 #endif 545 #ifdef CONFIG_MODULES 546 { 547 .procname = "modprobe", 548 .data = &modprobe_path, 549 .maxlen = KMOD_PATH_LEN, 550 .mode = 0644, 551 .proc_handler = proc_dostring, 552 }, 553 { 554 .procname = "modules_disabled", 555 .data = &modules_disabled, 556 .maxlen = sizeof(int), 557 .mode = 0644, 558 /* only handle a transition from default "0" to "1" */ 559 .proc_handler = proc_dointvec_minmax, 560 .extra1 = &one, 561 .extra2 = &one, 562 }, 563 #endif 564 #ifdef CONFIG_HOTPLUG 565 { 566 .procname = "hotplug", 567 .data = &uevent_helper, 568 .maxlen = UEVENT_HELPER_PATH_LEN, 569 .mode = 0644, 570 .proc_handler = proc_dostring, 571 }, 572 #endif 573 #ifdef CONFIG_CHR_DEV_SG 574 { 575 .procname = "sg-big-buff", 576 .data = &sg_big_buff, 577 .maxlen = sizeof (int), 578 .mode = 0444, 579 .proc_handler = proc_dointvec, 580 }, 581 #endif 582 #ifdef CONFIG_BSD_PROCESS_ACCT 583 { 584 .procname = "acct", 585 .data = &acct_parm, 586 .maxlen = 3*sizeof(int), 587 .mode = 0644, 588 .proc_handler = proc_dointvec, 589 }, 590 #endif 591 #ifdef CONFIG_MAGIC_SYSRQ 592 { 593 .procname = "sysrq", 594 .data = &__sysrq_enabled, 595 .maxlen = sizeof (int), 596 .mode = 0644, 597 .proc_handler = sysrq_sysctl_handler, 598 }, 599 #endif 600 #ifdef CONFIG_PROC_SYSCTL 601 { 602 .procname = "cad_pid", 603 .data = NULL, 604 .maxlen = sizeof (int), 605 .mode = 0600, 606 .proc_handler = proc_do_cad_pid, 607 }, 608 #endif 609 { 610 .procname = "threads-max", 611 .data = &max_threads, 612 .maxlen = sizeof(int), 613 .mode = 0644, 614 .proc_handler = proc_dointvec, 615 }, 616 { 617 .procname = "random", 618 .mode = 0555, 619 .child = random_table, 620 }, 621 { 622 .procname = "overflowuid", 623 .data = &overflowuid, 624 .maxlen = sizeof(int), 625 .mode = 0644, 626 .proc_handler = proc_dointvec_minmax, 627 .extra1 = &minolduid, 628 .extra2 = &maxolduid, 629 }, 630 { 631 .procname = "overflowgid", 632 .data = &overflowgid, 633 .maxlen = sizeof(int), 634 .mode = 0644, 635 .proc_handler = proc_dointvec_minmax, 636 .extra1 = &minolduid, 637 .extra2 = &maxolduid, 638 }, 639 #ifdef CONFIG_S390 640 #ifdef CONFIG_MATHEMU 641 { 642 .procname = "ieee_emulation_warnings", 643 .data = &sysctl_ieee_emulation_warnings, 644 .maxlen = sizeof(int), 645 .mode = 0644, 646 .proc_handler = proc_dointvec, 647 }, 648 #endif 649 { 650 .procname = "userprocess_debug", 651 .data = &show_unhandled_signals, 652 .maxlen = sizeof(int), 653 .mode = 0644, 654 .proc_handler = proc_dointvec, 655 }, 656 #endif 657 { 658 .procname = "pid_max", 659 .data = &pid_max, 660 .maxlen = sizeof (int), 661 .mode = 0644, 662 .proc_handler = proc_dointvec_minmax, 663 .extra1 = &pid_max_min, 664 .extra2 = &pid_max_max, 665 }, 666 { 667 .procname = "panic_on_oops", 668 .data = &panic_on_oops, 669 .maxlen = sizeof(int), 670 .mode = 0644, 671 .proc_handler = proc_dointvec, 672 }, 673 #if defined CONFIG_PRINTK 674 { 675 .procname = "printk", 676 .data = &console_loglevel, 677 .maxlen = 4*sizeof(int), 678 .mode = 0644, 679 .proc_handler = proc_dointvec, 680 }, 681 { 682 .procname = "printk_ratelimit", 683 .data = &printk_ratelimit_state.interval, 684 .maxlen = sizeof(int), 685 .mode = 0644, 686 .proc_handler = proc_dointvec_jiffies, 687 }, 688 { 689 .procname = "printk_ratelimit_burst", 690 .data = &printk_ratelimit_state.burst, 691 .maxlen = sizeof(int), 692 .mode = 0644, 693 .proc_handler = proc_dointvec, 694 }, 695 { 696 .procname = "printk_delay", 697 .data = &printk_delay_msec, 698 .maxlen = sizeof(int), 699 .mode = 0644, 700 .proc_handler = proc_dointvec_minmax, 701 .extra1 = &zero, 702 .extra2 = &ten_thousand, 703 }, 704 { 705 .procname = "dmesg_restrict", 706 .data = &dmesg_restrict, 707 .maxlen = sizeof(int), 708 .mode = 0644, 709 .proc_handler = proc_dointvec_minmax, 710 .extra1 = &zero, 711 .extra2 = &one, 712 }, 713 #endif 714 { 715 .procname = "ngroups_max", 716 .data = &ngroups_max, 717 .maxlen = sizeof (int), 718 .mode = 0444, 719 .proc_handler = proc_dointvec, 720 }, 721 #if defined(CONFIG_LOCKUP_DETECTOR) 722 { 723 .procname = "watchdog", 724 .data = &watchdog_enabled, 725 .maxlen = sizeof (int), 726 .mode = 0644, 727 .proc_handler = proc_dowatchdog_enabled, 728 }, 729 { 730 .procname = "watchdog_thresh", 731 .data = &softlockup_thresh, 732 .maxlen = sizeof(int), 733 .mode = 0644, 734 .proc_handler = proc_dowatchdog_thresh, 735 .extra1 = &neg_one, 736 .extra2 = &sixty, 737 }, 738 { 739 .procname = "softlockup_panic", 740 .data = &softlockup_panic, 741 .maxlen = sizeof(int), 742 .mode = 0644, 743 .proc_handler = proc_dointvec_minmax, 744 .extra1 = &zero, 745 .extra2 = &one, 746 }, 747 { 748 .procname = "nmi_watchdog", 749 .data = &watchdog_enabled, 750 .maxlen = sizeof (int), 751 .mode = 0644, 752 .proc_handler = proc_dowatchdog_enabled, 753 }, 754 #endif 755 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 756 { 757 .procname = "unknown_nmi_panic", 758 .data = &unknown_nmi_panic, 759 .maxlen = sizeof (int), 760 .mode = 0644, 761 .proc_handler = proc_dointvec, 762 }, 763 #endif 764 #if defined(CONFIG_X86) 765 { 766 .procname = "panic_on_unrecovered_nmi", 767 .data = &panic_on_unrecovered_nmi, 768 .maxlen = sizeof(int), 769 .mode = 0644, 770 .proc_handler = proc_dointvec, 771 }, 772 { 773 .procname = "panic_on_io_nmi", 774 .data = &panic_on_io_nmi, 775 .maxlen = sizeof(int), 776 .mode = 0644, 777 .proc_handler = proc_dointvec, 778 }, 779 { 780 .procname = "bootloader_type", 781 .data = &bootloader_type, 782 .maxlen = sizeof (int), 783 .mode = 0444, 784 .proc_handler = proc_dointvec, 785 }, 786 { 787 .procname = "bootloader_version", 788 .data = &bootloader_version, 789 .maxlen = sizeof (int), 790 .mode = 0444, 791 .proc_handler = proc_dointvec, 792 }, 793 { 794 .procname = "kstack_depth_to_print", 795 .data = &kstack_depth_to_print, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec, 799 }, 800 { 801 .procname = "io_delay_type", 802 .data = &io_delay_type, 803 .maxlen = sizeof(int), 804 .mode = 0644, 805 .proc_handler = proc_dointvec, 806 }, 807 #endif 808 #if defined(CONFIG_MMU) 809 { 810 .procname = "randomize_va_space", 811 .data = &randomize_va_space, 812 .maxlen = sizeof(int), 813 .mode = 0644, 814 .proc_handler = proc_dointvec, 815 }, 816 #endif 817 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 818 { 819 .procname = "spin_retry", 820 .data = &spin_retry, 821 .maxlen = sizeof (int), 822 .mode = 0644, 823 .proc_handler = proc_dointvec, 824 }, 825 #endif 826 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 827 { 828 .procname = "acpi_video_flags", 829 .data = &acpi_realmode_flags, 830 .maxlen = sizeof (unsigned long), 831 .mode = 0644, 832 .proc_handler = proc_doulongvec_minmax, 833 }, 834 #endif 835 #ifdef CONFIG_IA64 836 { 837 .procname = "ignore-unaligned-usertrap", 838 .data = &no_unaligned_warning, 839 .maxlen = sizeof (int), 840 .mode = 0644, 841 .proc_handler = proc_dointvec, 842 }, 843 { 844 .procname = "unaligned-dump-stack", 845 .data = &unaligned_dump_stack, 846 .maxlen = sizeof (int), 847 .mode = 0644, 848 .proc_handler = proc_dointvec, 849 }, 850 #endif 851 #ifdef CONFIG_DETECT_HUNG_TASK 852 { 853 .procname = "hung_task_panic", 854 .data = &sysctl_hung_task_panic, 855 .maxlen = sizeof(int), 856 .mode = 0644, 857 .proc_handler = proc_dointvec_minmax, 858 .extra1 = &zero, 859 .extra2 = &one, 860 }, 861 { 862 .procname = "hung_task_check_count", 863 .data = &sysctl_hung_task_check_count, 864 .maxlen = sizeof(unsigned long), 865 .mode = 0644, 866 .proc_handler = proc_doulongvec_minmax, 867 }, 868 { 869 .procname = "hung_task_timeout_secs", 870 .data = &sysctl_hung_task_timeout_secs, 871 .maxlen = sizeof(unsigned long), 872 .mode = 0644, 873 .proc_handler = proc_dohung_task_timeout_secs, 874 }, 875 { 876 .procname = "hung_task_warnings", 877 .data = &sysctl_hung_task_warnings, 878 .maxlen = sizeof(unsigned long), 879 .mode = 0644, 880 .proc_handler = proc_doulongvec_minmax, 881 }, 882 #endif 883 #ifdef CONFIG_COMPAT 884 { 885 .procname = "compat-log", 886 .data = &compat_log, 887 .maxlen = sizeof (int), 888 .mode = 0644, 889 .proc_handler = proc_dointvec, 890 }, 891 #endif 892 #ifdef CONFIG_RT_MUTEXES 893 { 894 .procname = "max_lock_depth", 895 .data = &max_lock_depth, 896 .maxlen = sizeof(int), 897 .mode = 0644, 898 .proc_handler = proc_dointvec, 899 }, 900 #endif 901 { 902 .procname = "poweroff_cmd", 903 .data = &poweroff_cmd, 904 .maxlen = POWEROFF_CMD_PATH_LEN, 905 .mode = 0644, 906 .proc_handler = proc_dostring, 907 }, 908 #ifdef CONFIG_KEYS 909 { 910 .procname = "keys", 911 .mode = 0555, 912 .child = key_sysctls, 913 }, 914 #endif 915 #ifdef CONFIG_RCU_TORTURE_TEST 916 { 917 .procname = "rcutorture_runnable", 918 .data = &rcutorture_runnable, 919 .maxlen = sizeof(int), 920 .mode = 0644, 921 .proc_handler = proc_dointvec, 922 }, 923 #endif 924 #ifdef CONFIG_PERF_EVENTS 925 { 926 .procname = "perf_event_paranoid", 927 .data = &sysctl_perf_event_paranoid, 928 .maxlen = sizeof(sysctl_perf_event_paranoid), 929 .mode = 0644, 930 .proc_handler = proc_dointvec, 931 }, 932 { 933 .procname = "perf_event_mlock_kb", 934 .data = &sysctl_perf_event_mlock, 935 .maxlen = sizeof(sysctl_perf_event_mlock), 936 .mode = 0644, 937 .proc_handler = proc_dointvec, 938 }, 939 { 940 .procname = "perf_event_max_sample_rate", 941 .data = &sysctl_perf_event_sample_rate, 942 .maxlen = sizeof(sysctl_perf_event_sample_rate), 943 .mode = 0644, 944 .proc_handler = proc_dointvec, 945 }, 946 #endif 947 #ifdef CONFIG_KMEMCHECK 948 { 949 .procname = "kmemcheck", 950 .data = &kmemcheck_enabled, 951 .maxlen = sizeof(int), 952 .mode = 0644, 953 .proc_handler = proc_dointvec, 954 }, 955 #endif 956 #ifdef CONFIG_BLOCK 957 { 958 .procname = "blk_iopoll", 959 .data = &blk_iopoll_enabled, 960 .maxlen = sizeof(int), 961 .mode = 0644, 962 .proc_handler = proc_dointvec, 963 }, 964 #endif 965 /* 966 * NOTE: do not add new entries to this table unless you have read 967 * Documentation/sysctl/ctl_unnumbered.txt 968 */ 969 { } 970 }; 971 972 static struct ctl_table vm_table[] = { 973 { 974 .procname = "overcommit_memory", 975 .data = &sysctl_overcommit_memory, 976 .maxlen = sizeof(sysctl_overcommit_memory), 977 .mode = 0644, 978 .proc_handler = proc_dointvec, 979 }, 980 { 981 .procname = "panic_on_oom", 982 .data = &sysctl_panic_on_oom, 983 .maxlen = sizeof(sysctl_panic_on_oom), 984 .mode = 0644, 985 .proc_handler = proc_dointvec, 986 }, 987 { 988 .procname = "oom_kill_allocating_task", 989 .data = &sysctl_oom_kill_allocating_task, 990 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 991 .mode = 0644, 992 .proc_handler = proc_dointvec, 993 }, 994 { 995 .procname = "oom_dump_tasks", 996 .data = &sysctl_oom_dump_tasks, 997 .maxlen = sizeof(sysctl_oom_dump_tasks), 998 .mode = 0644, 999 .proc_handler = proc_dointvec, 1000 }, 1001 { 1002 .procname = "overcommit_ratio", 1003 .data = &sysctl_overcommit_ratio, 1004 .maxlen = sizeof(sysctl_overcommit_ratio), 1005 .mode = 0644, 1006 .proc_handler = proc_dointvec, 1007 }, 1008 { 1009 .procname = "page-cluster", 1010 .data = &page_cluster, 1011 .maxlen = sizeof(int), 1012 .mode = 0644, 1013 .proc_handler = proc_dointvec, 1014 }, 1015 { 1016 .procname = "dirty_background_ratio", 1017 .data = &dirty_background_ratio, 1018 .maxlen = sizeof(dirty_background_ratio), 1019 .mode = 0644, 1020 .proc_handler = dirty_background_ratio_handler, 1021 .extra1 = &zero, 1022 .extra2 = &one_hundred, 1023 }, 1024 { 1025 .procname = "dirty_background_bytes", 1026 .data = &dirty_background_bytes, 1027 .maxlen = sizeof(dirty_background_bytes), 1028 .mode = 0644, 1029 .proc_handler = dirty_background_bytes_handler, 1030 .extra1 = &one_ul, 1031 }, 1032 { 1033 .procname = "dirty_ratio", 1034 .data = &vm_dirty_ratio, 1035 .maxlen = sizeof(vm_dirty_ratio), 1036 .mode = 0644, 1037 .proc_handler = dirty_ratio_handler, 1038 .extra1 = &zero, 1039 .extra2 = &one_hundred, 1040 }, 1041 { 1042 .procname = "dirty_bytes", 1043 .data = &vm_dirty_bytes, 1044 .maxlen = sizeof(vm_dirty_bytes), 1045 .mode = 0644, 1046 .proc_handler = dirty_bytes_handler, 1047 .extra1 = &dirty_bytes_min, 1048 }, 1049 { 1050 .procname = "dirty_writeback_centisecs", 1051 .data = &dirty_writeback_interval, 1052 .maxlen = sizeof(dirty_writeback_interval), 1053 .mode = 0644, 1054 .proc_handler = dirty_writeback_centisecs_handler, 1055 }, 1056 { 1057 .procname = "dirty_expire_centisecs", 1058 .data = &dirty_expire_interval, 1059 .maxlen = sizeof(dirty_expire_interval), 1060 .mode = 0644, 1061 .proc_handler = proc_dointvec, 1062 }, 1063 { 1064 .procname = "nr_pdflush_threads", 1065 .data = &nr_pdflush_threads, 1066 .maxlen = sizeof nr_pdflush_threads, 1067 .mode = 0444 /* read-only*/, 1068 .proc_handler = proc_dointvec, 1069 }, 1070 { 1071 .procname = "swappiness", 1072 .data = &vm_swappiness, 1073 .maxlen = sizeof(vm_swappiness), 1074 .mode = 0644, 1075 .proc_handler = proc_dointvec_minmax, 1076 .extra1 = &zero, 1077 .extra2 = &one_hundred, 1078 }, 1079 #ifdef CONFIG_HUGETLB_PAGE 1080 { 1081 .procname = "nr_hugepages", 1082 .data = NULL, 1083 .maxlen = sizeof(unsigned long), 1084 .mode = 0644, 1085 .proc_handler = hugetlb_sysctl_handler, 1086 .extra1 = (void *)&hugetlb_zero, 1087 .extra2 = (void *)&hugetlb_infinity, 1088 }, 1089 #ifdef CONFIG_NUMA 1090 { 1091 .procname = "nr_hugepages_mempolicy", 1092 .data = NULL, 1093 .maxlen = sizeof(unsigned long), 1094 .mode = 0644, 1095 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1096 .extra1 = (void *)&hugetlb_zero, 1097 .extra2 = (void *)&hugetlb_infinity, 1098 }, 1099 #endif 1100 { 1101 .procname = "hugetlb_shm_group", 1102 .data = &sysctl_hugetlb_shm_group, 1103 .maxlen = sizeof(gid_t), 1104 .mode = 0644, 1105 .proc_handler = proc_dointvec, 1106 }, 1107 { 1108 .procname = "hugepages_treat_as_movable", 1109 .data = &hugepages_treat_as_movable, 1110 .maxlen = sizeof(int), 1111 .mode = 0644, 1112 .proc_handler = hugetlb_treat_movable_handler, 1113 }, 1114 { 1115 .procname = "nr_overcommit_hugepages", 1116 .data = NULL, 1117 .maxlen = sizeof(unsigned long), 1118 .mode = 0644, 1119 .proc_handler = hugetlb_overcommit_handler, 1120 .extra1 = (void *)&hugetlb_zero, 1121 .extra2 = (void *)&hugetlb_infinity, 1122 }, 1123 #endif 1124 { 1125 .procname = "lowmem_reserve_ratio", 1126 .data = &sysctl_lowmem_reserve_ratio, 1127 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1128 .mode = 0644, 1129 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1130 }, 1131 { 1132 .procname = "drop_caches", 1133 .data = &sysctl_drop_caches, 1134 .maxlen = sizeof(int), 1135 .mode = 0644, 1136 .proc_handler = drop_caches_sysctl_handler, 1137 }, 1138 #ifdef CONFIG_COMPACTION 1139 { 1140 .procname = "compact_memory", 1141 .data = &sysctl_compact_memory, 1142 .maxlen = sizeof(int), 1143 .mode = 0200, 1144 .proc_handler = sysctl_compaction_handler, 1145 }, 1146 { 1147 .procname = "extfrag_threshold", 1148 .data = &sysctl_extfrag_threshold, 1149 .maxlen = sizeof(int), 1150 .mode = 0644, 1151 .proc_handler = sysctl_extfrag_handler, 1152 .extra1 = &min_extfrag_threshold, 1153 .extra2 = &max_extfrag_threshold, 1154 }, 1155 1156 #endif /* CONFIG_COMPACTION */ 1157 { 1158 .procname = "min_free_kbytes", 1159 .data = &min_free_kbytes, 1160 .maxlen = sizeof(min_free_kbytes), 1161 .mode = 0644, 1162 .proc_handler = min_free_kbytes_sysctl_handler, 1163 .extra1 = &zero, 1164 }, 1165 { 1166 .procname = "percpu_pagelist_fraction", 1167 .data = &percpu_pagelist_fraction, 1168 .maxlen = sizeof(percpu_pagelist_fraction), 1169 .mode = 0644, 1170 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1171 .extra1 = &min_percpu_pagelist_fract, 1172 }, 1173 #ifdef CONFIG_MMU 1174 { 1175 .procname = "max_map_count", 1176 .data = &sysctl_max_map_count, 1177 .maxlen = sizeof(sysctl_max_map_count), 1178 .mode = 0644, 1179 .proc_handler = proc_dointvec_minmax, 1180 .extra1 = &zero, 1181 }, 1182 #else 1183 { 1184 .procname = "nr_trim_pages", 1185 .data = &sysctl_nr_trim_pages, 1186 .maxlen = sizeof(sysctl_nr_trim_pages), 1187 .mode = 0644, 1188 .proc_handler = proc_dointvec_minmax, 1189 .extra1 = &zero, 1190 }, 1191 #endif 1192 { 1193 .procname = "laptop_mode", 1194 .data = &laptop_mode, 1195 .maxlen = sizeof(laptop_mode), 1196 .mode = 0644, 1197 .proc_handler = proc_dointvec_jiffies, 1198 }, 1199 { 1200 .procname = "block_dump", 1201 .data = &block_dump, 1202 .maxlen = sizeof(block_dump), 1203 .mode = 0644, 1204 .proc_handler = proc_dointvec, 1205 .extra1 = &zero, 1206 }, 1207 { 1208 .procname = "vfs_cache_pressure", 1209 .data = &sysctl_vfs_cache_pressure, 1210 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1211 .mode = 0644, 1212 .proc_handler = proc_dointvec, 1213 .extra1 = &zero, 1214 }, 1215 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1216 { 1217 .procname = "legacy_va_layout", 1218 .data = &sysctl_legacy_va_layout, 1219 .maxlen = sizeof(sysctl_legacy_va_layout), 1220 .mode = 0644, 1221 .proc_handler = proc_dointvec, 1222 .extra1 = &zero, 1223 }, 1224 #endif 1225 #ifdef CONFIG_NUMA 1226 { 1227 .procname = "zone_reclaim_mode", 1228 .data = &zone_reclaim_mode, 1229 .maxlen = sizeof(zone_reclaim_mode), 1230 .mode = 0644, 1231 .proc_handler = proc_dointvec, 1232 .extra1 = &zero, 1233 }, 1234 { 1235 .procname = "min_unmapped_ratio", 1236 .data = &sysctl_min_unmapped_ratio, 1237 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1238 .mode = 0644, 1239 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1240 .extra1 = &zero, 1241 .extra2 = &one_hundred, 1242 }, 1243 { 1244 .procname = "min_slab_ratio", 1245 .data = &sysctl_min_slab_ratio, 1246 .maxlen = sizeof(sysctl_min_slab_ratio), 1247 .mode = 0644, 1248 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1249 .extra1 = &zero, 1250 .extra2 = &one_hundred, 1251 }, 1252 #endif 1253 #ifdef CONFIG_SMP 1254 { 1255 .procname = "stat_interval", 1256 .data = &sysctl_stat_interval, 1257 .maxlen = sizeof(sysctl_stat_interval), 1258 .mode = 0644, 1259 .proc_handler = proc_dointvec_jiffies, 1260 }, 1261 #endif 1262 #ifdef CONFIG_MMU 1263 { 1264 .procname = "mmap_min_addr", 1265 .data = &dac_mmap_min_addr, 1266 .maxlen = sizeof(unsigned long), 1267 .mode = 0644, 1268 .proc_handler = mmap_min_addr_handler, 1269 }, 1270 #endif 1271 #ifdef CONFIG_NUMA 1272 { 1273 .procname = "numa_zonelist_order", 1274 .data = &numa_zonelist_order, 1275 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1276 .mode = 0644, 1277 .proc_handler = numa_zonelist_order_handler, 1278 }, 1279 #endif 1280 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1281 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1282 { 1283 .procname = "vdso_enabled", 1284 .data = &vdso_enabled, 1285 .maxlen = sizeof(vdso_enabled), 1286 .mode = 0644, 1287 .proc_handler = proc_dointvec, 1288 .extra1 = &zero, 1289 }, 1290 #endif 1291 #ifdef CONFIG_HIGHMEM 1292 { 1293 .procname = "highmem_is_dirtyable", 1294 .data = &vm_highmem_is_dirtyable, 1295 .maxlen = sizeof(vm_highmem_is_dirtyable), 1296 .mode = 0644, 1297 .proc_handler = proc_dointvec_minmax, 1298 .extra1 = &zero, 1299 .extra2 = &one, 1300 }, 1301 #endif 1302 { 1303 .procname = "scan_unevictable_pages", 1304 .data = &scan_unevictable_pages, 1305 .maxlen = sizeof(scan_unevictable_pages), 1306 .mode = 0644, 1307 .proc_handler = scan_unevictable_handler, 1308 }, 1309 #ifdef CONFIG_MEMORY_FAILURE 1310 { 1311 .procname = "memory_failure_early_kill", 1312 .data = &sysctl_memory_failure_early_kill, 1313 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1314 .mode = 0644, 1315 .proc_handler = proc_dointvec_minmax, 1316 .extra1 = &zero, 1317 .extra2 = &one, 1318 }, 1319 { 1320 .procname = "memory_failure_recovery", 1321 .data = &sysctl_memory_failure_recovery, 1322 .maxlen = sizeof(sysctl_memory_failure_recovery), 1323 .mode = 0644, 1324 .proc_handler = proc_dointvec_minmax, 1325 .extra1 = &zero, 1326 .extra2 = &one, 1327 }, 1328 #endif 1329 1330 /* 1331 * NOTE: do not add new entries to this table unless you have read 1332 * Documentation/sysctl/ctl_unnumbered.txt 1333 */ 1334 { } 1335 }; 1336 1337 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1338 static struct ctl_table binfmt_misc_table[] = { 1339 { } 1340 }; 1341 #endif 1342 1343 static struct ctl_table fs_table[] = { 1344 { 1345 .procname = "inode-nr", 1346 .data = &inodes_stat, 1347 .maxlen = 2*sizeof(int), 1348 .mode = 0444, 1349 .proc_handler = proc_nr_inodes, 1350 }, 1351 { 1352 .procname = "inode-state", 1353 .data = &inodes_stat, 1354 .maxlen = 7*sizeof(int), 1355 .mode = 0444, 1356 .proc_handler = proc_nr_inodes, 1357 }, 1358 { 1359 .procname = "file-nr", 1360 .data = &files_stat, 1361 .maxlen = sizeof(files_stat), 1362 .mode = 0444, 1363 .proc_handler = proc_nr_files, 1364 }, 1365 { 1366 .procname = "file-max", 1367 .data = &files_stat.max_files, 1368 .maxlen = sizeof(files_stat.max_files), 1369 .mode = 0644, 1370 .proc_handler = proc_doulongvec_minmax, 1371 }, 1372 { 1373 .procname = "nr_open", 1374 .data = &sysctl_nr_open, 1375 .maxlen = sizeof(int), 1376 .mode = 0644, 1377 .proc_handler = proc_dointvec_minmax, 1378 .extra1 = &sysctl_nr_open_min, 1379 .extra2 = &sysctl_nr_open_max, 1380 }, 1381 { 1382 .procname = "dentry-state", 1383 .data = &dentry_stat, 1384 .maxlen = 6*sizeof(int), 1385 .mode = 0444, 1386 .proc_handler = proc_nr_dentry, 1387 }, 1388 { 1389 .procname = "overflowuid", 1390 .data = &fs_overflowuid, 1391 .maxlen = sizeof(int), 1392 .mode = 0644, 1393 .proc_handler = proc_dointvec_minmax, 1394 .extra1 = &minolduid, 1395 .extra2 = &maxolduid, 1396 }, 1397 { 1398 .procname = "overflowgid", 1399 .data = &fs_overflowgid, 1400 .maxlen = sizeof(int), 1401 .mode = 0644, 1402 .proc_handler = proc_dointvec_minmax, 1403 .extra1 = &minolduid, 1404 .extra2 = &maxolduid, 1405 }, 1406 #ifdef CONFIG_FILE_LOCKING 1407 { 1408 .procname = "leases-enable", 1409 .data = &leases_enable, 1410 .maxlen = sizeof(int), 1411 .mode = 0644, 1412 .proc_handler = proc_dointvec, 1413 }, 1414 #endif 1415 #ifdef CONFIG_DNOTIFY 1416 { 1417 .procname = "dir-notify-enable", 1418 .data = &dir_notify_enable, 1419 .maxlen = sizeof(int), 1420 .mode = 0644, 1421 .proc_handler = proc_dointvec, 1422 }, 1423 #endif 1424 #ifdef CONFIG_MMU 1425 #ifdef CONFIG_FILE_LOCKING 1426 { 1427 .procname = "lease-break-time", 1428 .data = &lease_break_time, 1429 .maxlen = sizeof(int), 1430 .mode = 0644, 1431 .proc_handler = proc_dointvec, 1432 }, 1433 #endif 1434 #ifdef CONFIG_AIO 1435 { 1436 .procname = "aio-nr", 1437 .data = &aio_nr, 1438 .maxlen = sizeof(aio_nr), 1439 .mode = 0444, 1440 .proc_handler = proc_doulongvec_minmax, 1441 }, 1442 { 1443 .procname = "aio-max-nr", 1444 .data = &aio_max_nr, 1445 .maxlen = sizeof(aio_max_nr), 1446 .mode = 0644, 1447 .proc_handler = proc_doulongvec_minmax, 1448 }, 1449 #endif /* CONFIG_AIO */ 1450 #ifdef CONFIG_INOTIFY_USER 1451 { 1452 .procname = "inotify", 1453 .mode = 0555, 1454 .child = inotify_table, 1455 }, 1456 #endif 1457 #ifdef CONFIG_EPOLL 1458 { 1459 .procname = "epoll", 1460 .mode = 0555, 1461 .child = epoll_table, 1462 }, 1463 #endif 1464 #endif 1465 { 1466 .procname = "suid_dumpable", 1467 .data = &suid_dumpable, 1468 .maxlen = sizeof(int), 1469 .mode = 0644, 1470 .proc_handler = proc_dointvec_minmax, 1471 .extra1 = &zero, 1472 .extra2 = &two, 1473 }, 1474 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1475 { 1476 .procname = "binfmt_misc", 1477 .mode = 0555, 1478 .child = binfmt_misc_table, 1479 }, 1480 #endif 1481 { 1482 .procname = "pipe-max-size", 1483 .data = &pipe_max_size, 1484 .maxlen = sizeof(int), 1485 .mode = 0644, 1486 .proc_handler = &pipe_proc_fn, 1487 .extra1 = &pipe_min_size, 1488 }, 1489 /* 1490 * NOTE: do not add new entries to this table unless you have read 1491 * Documentation/sysctl/ctl_unnumbered.txt 1492 */ 1493 { } 1494 }; 1495 1496 static struct ctl_table debug_table[] = { 1497 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1498 defined(CONFIG_S390) 1499 { 1500 .procname = "exception-trace", 1501 .data = &show_unhandled_signals, 1502 .maxlen = sizeof(int), 1503 .mode = 0644, 1504 .proc_handler = proc_dointvec 1505 }, 1506 #endif 1507 #if defined(CONFIG_OPTPROBES) 1508 { 1509 .procname = "kprobes-optimization", 1510 .data = &sysctl_kprobes_optimization, 1511 .maxlen = sizeof(int), 1512 .mode = 0644, 1513 .proc_handler = proc_kprobes_optimization_handler, 1514 .extra1 = &zero, 1515 .extra2 = &one, 1516 }, 1517 #endif 1518 { } 1519 }; 1520 1521 static struct ctl_table dev_table[] = { 1522 { } 1523 }; 1524 1525 static DEFINE_SPINLOCK(sysctl_lock); 1526 1527 /* called under sysctl_lock */ 1528 static int use_table(struct ctl_table_header *p) 1529 { 1530 if (unlikely(p->unregistering)) 1531 return 0; 1532 p->used++; 1533 return 1; 1534 } 1535 1536 /* called under sysctl_lock */ 1537 static void unuse_table(struct ctl_table_header *p) 1538 { 1539 if (!--p->used) 1540 if (unlikely(p->unregistering)) 1541 complete(p->unregistering); 1542 } 1543 1544 /* called under sysctl_lock, will reacquire if has to wait */ 1545 static void start_unregistering(struct ctl_table_header *p) 1546 { 1547 /* 1548 * if p->used is 0, nobody will ever touch that entry again; 1549 * we'll eliminate all paths to it before dropping sysctl_lock 1550 */ 1551 if (unlikely(p->used)) { 1552 struct completion wait; 1553 init_completion(&wait); 1554 p->unregistering = &wait; 1555 spin_unlock(&sysctl_lock); 1556 wait_for_completion(&wait); 1557 spin_lock(&sysctl_lock); 1558 } else { 1559 /* anything non-NULL; we'll never dereference it */ 1560 p->unregistering = ERR_PTR(-EINVAL); 1561 } 1562 /* 1563 * do not remove from the list until nobody holds it; walking the 1564 * list in do_sysctl() relies on that. 1565 */ 1566 list_del_init(&p->ctl_entry); 1567 } 1568 1569 void sysctl_head_get(struct ctl_table_header *head) 1570 { 1571 spin_lock(&sysctl_lock); 1572 head->count++; 1573 spin_unlock(&sysctl_lock); 1574 } 1575 1576 void sysctl_head_put(struct ctl_table_header *head) 1577 { 1578 spin_lock(&sysctl_lock); 1579 if (!--head->count) 1580 kfree(head); 1581 spin_unlock(&sysctl_lock); 1582 } 1583 1584 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1585 { 1586 if (!head) 1587 BUG(); 1588 spin_lock(&sysctl_lock); 1589 if (!use_table(head)) 1590 head = ERR_PTR(-ENOENT); 1591 spin_unlock(&sysctl_lock); 1592 return head; 1593 } 1594 1595 void sysctl_head_finish(struct ctl_table_header *head) 1596 { 1597 if (!head) 1598 return; 1599 spin_lock(&sysctl_lock); 1600 unuse_table(head); 1601 spin_unlock(&sysctl_lock); 1602 } 1603 1604 static struct ctl_table_set * 1605 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1606 { 1607 struct ctl_table_set *set = &root->default_set; 1608 if (root->lookup) 1609 set = root->lookup(root, namespaces); 1610 return set; 1611 } 1612 1613 static struct list_head * 1614 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1615 { 1616 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1617 return &set->list; 1618 } 1619 1620 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1621 struct ctl_table_header *prev) 1622 { 1623 struct ctl_table_root *root; 1624 struct list_head *header_list; 1625 struct ctl_table_header *head; 1626 struct list_head *tmp; 1627 1628 spin_lock(&sysctl_lock); 1629 if (prev) { 1630 head = prev; 1631 tmp = &prev->ctl_entry; 1632 unuse_table(prev); 1633 goto next; 1634 } 1635 tmp = &root_table_header.ctl_entry; 1636 for (;;) { 1637 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1638 1639 if (!use_table(head)) 1640 goto next; 1641 spin_unlock(&sysctl_lock); 1642 return head; 1643 next: 1644 root = head->root; 1645 tmp = tmp->next; 1646 header_list = lookup_header_list(root, namespaces); 1647 if (tmp != header_list) 1648 continue; 1649 1650 do { 1651 root = list_entry(root->root_list.next, 1652 struct ctl_table_root, root_list); 1653 if (root == &sysctl_table_root) 1654 goto out; 1655 header_list = lookup_header_list(root, namespaces); 1656 } while (list_empty(header_list)); 1657 tmp = header_list->next; 1658 } 1659 out: 1660 spin_unlock(&sysctl_lock); 1661 return NULL; 1662 } 1663 1664 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1665 { 1666 return __sysctl_head_next(current->nsproxy, prev); 1667 } 1668 1669 void register_sysctl_root(struct ctl_table_root *root) 1670 { 1671 spin_lock(&sysctl_lock); 1672 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1673 spin_unlock(&sysctl_lock); 1674 } 1675 1676 /* 1677 * sysctl_perm does NOT grant the superuser all rights automatically, because 1678 * some sysctl variables are readonly even to root. 1679 */ 1680 1681 static int test_perm(int mode, int op) 1682 { 1683 if (!current_euid()) 1684 mode >>= 6; 1685 else if (in_egroup_p(0)) 1686 mode >>= 3; 1687 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1688 return 0; 1689 return -EACCES; 1690 } 1691 1692 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1693 { 1694 int error; 1695 int mode; 1696 1697 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1698 if (error) 1699 return error; 1700 1701 if (root->permissions) 1702 mode = root->permissions(root, current->nsproxy, table); 1703 else 1704 mode = table->mode; 1705 1706 return test_perm(mode, op); 1707 } 1708 1709 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1710 { 1711 for (; table->procname; table++) { 1712 table->parent = parent; 1713 if (table->child) 1714 sysctl_set_parent(table, table->child); 1715 } 1716 } 1717 1718 static __init int sysctl_init(void) 1719 { 1720 sysctl_set_parent(NULL, root_table); 1721 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1722 sysctl_check_table(current->nsproxy, root_table); 1723 #endif 1724 return 0; 1725 } 1726 1727 core_initcall(sysctl_init); 1728 1729 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1730 struct ctl_table *table) 1731 { 1732 struct ctl_table *p; 1733 const char *s = branch->procname; 1734 1735 /* branch should have named subdirectory as its first element */ 1736 if (!s || !branch->child) 1737 return NULL; 1738 1739 /* ... and nothing else */ 1740 if (branch[1].procname) 1741 return NULL; 1742 1743 /* table should contain subdirectory with the same name */ 1744 for (p = table; p->procname; p++) { 1745 if (!p->child) 1746 continue; 1747 if (p->procname && strcmp(p->procname, s) == 0) 1748 return p; 1749 } 1750 return NULL; 1751 } 1752 1753 /* see if attaching q to p would be an improvement */ 1754 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1755 { 1756 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1757 struct ctl_table *next; 1758 int is_better = 0; 1759 int not_in_parent = !p->attached_by; 1760 1761 while ((next = is_branch_in(by, to)) != NULL) { 1762 if (by == q->attached_by) 1763 is_better = 1; 1764 if (to == p->attached_by) 1765 not_in_parent = 1; 1766 by = by->child; 1767 to = next->child; 1768 } 1769 1770 if (is_better && not_in_parent) { 1771 q->attached_by = by; 1772 q->attached_to = to; 1773 q->parent = p; 1774 } 1775 } 1776 1777 /** 1778 * __register_sysctl_paths - register a sysctl hierarchy 1779 * @root: List of sysctl headers to register on 1780 * @namespaces: Data to compute which lists of sysctl entries are visible 1781 * @path: The path to the directory the sysctl table is in. 1782 * @table: the top-level table structure 1783 * 1784 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1785 * array. A completely 0 filled entry terminates the table. 1786 * 1787 * The members of the &struct ctl_table structure are used as follows: 1788 * 1789 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1790 * enter a sysctl file 1791 * 1792 * data - a pointer to data for use by proc_handler 1793 * 1794 * maxlen - the maximum size in bytes of the data 1795 * 1796 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1797 * 1798 * child - a pointer to the child sysctl table if this entry is a directory, or 1799 * %NULL. 1800 * 1801 * proc_handler - the text handler routine (described below) 1802 * 1803 * de - for internal use by the sysctl routines 1804 * 1805 * extra1, extra2 - extra pointers usable by the proc handler routines 1806 * 1807 * Leaf nodes in the sysctl tree will be represented by a single file 1808 * under /proc; non-leaf nodes will be represented by directories. 1809 * 1810 * sysctl(2) can automatically manage read and write requests through 1811 * the sysctl table. The data and maxlen fields of the ctl_table 1812 * struct enable minimal validation of the values being written to be 1813 * performed, and the mode field allows minimal authentication. 1814 * 1815 * There must be a proc_handler routine for any terminal nodes 1816 * mirrored under /proc/sys (non-terminals are handled by a built-in 1817 * directory handler). Several default handlers are available to 1818 * cover common cases - 1819 * 1820 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1821 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1822 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1823 * 1824 * It is the handler's job to read the input buffer from user memory 1825 * and process it. The handler should return 0 on success. 1826 * 1827 * This routine returns %NULL on a failure to register, and a pointer 1828 * to the table header on success. 1829 */ 1830 struct ctl_table_header *__register_sysctl_paths( 1831 struct ctl_table_root *root, 1832 struct nsproxy *namespaces, 1833 const struct ctl_path *path, struct ctl_table *table) 1834 { 1835 struct ctl_table_header *header; 1836 struct ctl_table *new, **prevp; 1837 unsigned int n, npath; 1838 struct ctl_table_set *set; 1839 1840 /* Count the path components */ 1841 for (npath = 0; path[npath].procname; ++npath) 1842 ; 1843 1844 /* 1845 * For each path component, allocate a 2-element ctl_table array. 1846 * The first array element will be filled with the sysctl entry 1847 * for this, the second will be the sentinel (procname == 0). 1848 * 1849 * We allocate everything in one go so that we don't have to 1850 * worry about freeing additional memory in unregister_sysctl_table. 1851 */ 1852 header = kzalloc(sizeof(struct ctl_table_header) + 1853 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1854 if (!header) 1855 return NULL; 1856 1857 new = (struct ctl_table *) (header + 1); 1858 1859 /* Now connect the dots */ 1860 prevp = &header->ctl_table; 1861 for (n = 0; n < npath; ++n, ++path) { 1862 /* Copy the procname */ 1863 new->procname = path->procname; 1864 new->mode = 0555; 1865 1866 *prevp = new; 1867 prevp = &new->child; 1868 1869 new += 2; 1870 } 1871 *prevp = table; 1872 header->ctl_table_arg = table; 1873 1874 INIT_LIST_HEAD(&header->ctl_entry); 1875 header->used = 0; 1876 header->unregistering = NULL; 1877 header->root = root; 1878 sysctl_set_parent(NULL, header->ctl_table); 1879 header->count = 1; 1880 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1881 if (sysctl_check_table(namespaces, header->ctl_table)) { 1882 kfree(header); 1883 return NULL; 1884 } 1885 #endif 1886 spin_lock(&sysctl_lock); 1887 header->set = lookup_header_set(root, namespaces); 1888 header->attached_by = header->ctl_table; 1889 header->attached_to = root_table; 1890 header->parent = &root_table_header; 1891 for (set = header->set; set; set = set->parent) { 1892 struct ctl_table_header *p; 1893 list_for_each_entry(p, &set->list, ctl_entry) { 1894 if (p->unregistering) 1895 continue; 1896 try_attach(p, header); 1897 } 1898 } 1899 header->parent->count++; 1900 list_add_tail(&header->ctl_entry, &header->set->list); 1901 spin_unlock(&sysctl_lock); 1902 1903 return header; 1904 } 1905 1906 /** 1907 * register_sysctl_table_path - register a sysctl table hierarchy 1908 * @path: The path to the directory the sysctl table is in. 1909 * @table: the top-level table structure 1910 * 1911 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1912 * array. A completely 0 filled entry terminates the table. 1913 * 1914 * See __register_sysctl_paths for more details. 1915 */ 1916 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1917 struct ctl_table *table) 1918 { 1919 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1920 path, table); 1921 } 1922 1923 /** 1924 * register_sysctl_table - register a sysctl table hierarchy 1925 * @table: the top-level table structure 1926 * 1927 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1928 * array. A completely 0 filled entry terminates the table. 1929 * 1930 * See register_sysctl_paths for more details. 1931 */ 1932 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1933 { 1934 static const struct ctl_path null_path[] = { {} }; 1935 1936 return register_sysctl_paths(null_path, table); 1937 } 1938 1939 /** 1940 * unregister_sysctl_table - unregister a sysctl table hierarchy 1941 * @header: the header returned from register_sysctl_table 1942 * 1943 * Unregisters the sysctl table and all children. proc entries may not 1944 * actually be removed until they are no longer used by anyone. 1945 */ 1946 void unregister_sysctl_table(struct ctl_table_header * header) 1947 { 1948 might_sleep(); 1949 1950 if (header == NULL) 1951 return; 1952 1953 spin_lock(&sysctl_lock); 1954 start_unregistering(header); 1955 if (!--header->parent->count) { 1956 WARN_ON(1); 1957 kfree(header->parent); 1958 } 1959 if (!--header->count) 1960 kfree(header); 1961 spin_unlock(&sysctl_lock); 1962 } 1963 1964 int sysctl_is_seen(struct ctl_table_header *p) 1965 { 1966 struct ctl_table_set *set = p->set; 1967 int res; 1968 spin_lock(&sysctl_lock); 1969 if (p->unregistering) 1970 res = 0; 1971 else if (!set->is_seen) 1972 res = 1; 1973 else 1974 res = set->is_seen(set); 1975 spin_unlock(&sysctl_lock); 1976 return res; 1977 } 1978 1979 void setup_sysctl_set(struct ctl_table_set *p, 1980 struct ctl_table_set *parent, 1981 int (*is_seen)(struct ctl_table_set *)) 1982 { 1983 INIT_LIST_HEAD(&p->list); 1984 p->parent = parent ? parent : &sysctl_table_root.default_set; 1985 p->is_seen = is_seen; 1986 } 1987 1988 #else /* !CONFIG_SYSCTL */ 1989 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1990 { 1991 return NULL; 1992 } 1993 1994 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1995 struct ctl_table *table) 1996 { 1997 return NULL; 1998 } 1999 2000 void unregister_sysctl_table(struct ctl_table_header * table) 2001 { 2002 } 2003 2004 void setup_sysctl_set(struct ctl_table_set *p, 2005 struct ctl_table_set *parent, 2006 int (*is_seen)(struct ctl_table_set *)) 2007 { 2008 } 2009 2010 void sysctl_head_put(struct ctl_table_header *head) 2011 { 2012 } 2013 2014 #endif /* CONFIG_SYSCTL */ 2015 2016 /* 2017 * /proc/sys support 2018 */ 2019 2020 #ifdef CONFIG_PROC_SYSCTL 2021 2022 static int _proc_do_string(void* data, int maxlen, int write, 2023 void __user *buffer, 2024 size_t *lenp, loff_t *ppos) 2025 { 2026 size_t len; 2027 char __user *p; 2028 char c; 2029 2030 if (!data || !maxlen || !*lenp) { 2031 *lenp = 0; 2032 return 0; 2033 } 2034 2035 if (write) { 2036 len = 0; 2037 p = buffer; 2038 while (len < *lenp) { 2039 if (get_user(c, p++)) 2040 return -EFAULT; 2041 if (c == 0 || c == '\n') 2042 break; 2043 len++; 2044 } 2045 if (len >= maxlen) 2046 len = maxlen-1; 2047 if(copy_from_user(data, buffer, len)) 2048 return -EFAULT; 2049 ((char *) data)[len] = 0; 2050 *ppos += *lenp; 2051 } else { 2052 len = strlen(data); 2053 if (len > maxlen) 2054 len = maxlen; 2055 2056 if (*ppos > len) { 2057 *lenp = 0; 2058 return 0; 2059 } 2060 2061 data += *ppos; 2062 len -= *ppos; 2063 2064 if (len > *lenp) 2065 len = *lenp; 2066 if (len) 2067 if(copy_to_user(buffer, data, len)) 2068 return -EFAULT; 2069 if (len < *lenp) { 2070 if(put_user('\n', ((char __user *) buffer) + len)) 2071 return -EFAULT; 2072 len++; 2073 } 2074 *lenp = len; 2075 *ppos += len; 2076 } 2077 return 0; 2078 } 2079 2080 /** 2081 * proc_dostring - read a string sysctl 2082 * @table: the sysctl table 2083 * @write: %TRUE if this is a write to the sysctl file 2084 * @buffer: the user buffer 2085 * @lenp: the size of the user buffer 2086 * @ppos: file position 2087 * 2088 * Reads/writes a string from/to the user buffer. If the kernel 2089 * buffer provided is not large enough to hold the string, the 2090 * string is truncated. The copied string is %NULL-terminated. 2091 * If the string is being read by the user process, it is copied 2092 * and a newline '\n' is added. It is truncated if the buffer is 2093 * not large enough. 2094 * 2095 * Returns 0 on success. 2096 */ 2097 int proc_dostring(struct ctl_table *table, int write, 2098 void __user *buffer, size_t *lenp, loff_t *ppos) 2099 { 2100 return _proc_do_string(table->data, table->maxlen, write, 2101 buffer, lenp, ppos); 2102 } 2103 2104 static size_t proc_skip_spaces(char **buf) 2105 { 2106 size_t ret; 2107 char *tmp = skip_spaces(*buf); 2108 ret = tmp - *buf; 2109 *buf = tmp; 2110 return ret; 2111 } 2112 2113 static void proc_skip_char(char **buf, size_t *size, const char v) 2114 { 2115 while (*size) { 2116 if (**buf != v) 2117 break; 2118 (*size)--; 2119 (*buf)++; 2120 } 2121 } 2122 2123 #define TMPBUFLEN 22 2124 /** 2125 * proc_get_long - reads an ASCII formatted integer from a user buffer 2126 * 2127 * @buf: a kernel buffer 2128 * @size: size of the kernel buffer 2129 * @val: this is where the number will be stored 2130 * @neg: set to %TRUE if number is negative 2131 * @perm_tr: a vector which contains the allowed trailers 2132 * @perm_tr_len: size of the perm_tr vector 2133 * @tr: pointer to store the trailer character 2134 * 2135 * In case of success %0 is returned and @buf and @size are updated with 2136 * the amount of bytes read. If @tr is non-NULL and a trailing 2137 * character exists (size is non-zero after returning from this 2138 * function), @tr is updated with the trailing character. 2139 */ 2140 static int proc_get_long(char **buf, size_t *size, 2141 unsigned long *val, bool *neg, 2142 const char *perm_tr, unsigned perm_tr_len, char *tr) 2143 { 2144 int len; 2145 char *p, tmp[TMPBUFLEN]; 2146 2147 if (!*size) 2148 return -EINVAL; 2149 2150 len = *size; 2151 if (len > TMPBUFLEN - 1) 2152 len = TMPBUFLEN - 1; 2153 2154 memcpy(tmp, *buf, len); 2155 2156 tmp[len] = 0; 2157 p = tmp; 2158 if (*p == '-' && *size > 1) { 2159 *neg = true; 2160 p++; 2161 } else 2162 *neg = false; 2163 if (!isdigit(*p)) 2164 return -EINVAL; 2165 2166 *val = simple_strtoul(p, &p, 0); 2167 2168 len = p - tmp; 2169 2170 /* We don't know if the next char is whitespace thus we may accept 2171 * invalid integers (e.g. 1234...a) or two integers instead of one 2172 * (e.g. 123...1). So lets not allow such large numbers. */ 2173 if (len == TMPBUFLEN - 1) 2174 return -EINVAL; 2175 2176 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2177 return -EINVAL; 2178 2179 if (tr && (len < *size)) 2180 *tr = *p; 2181 2182 *buf += len; 2183 *size -= len; 2184 2185 return 0; 2186 } 2187 2188 /** 2189 * proc_put_long - converts an integer to a decimal ASCII formatted string 2190 * 2191 * @buf: the user buffer 2192 * @size: the size of the user buffer 2193 * @val: the integer to be converted 2194 * @neg: sign of the number, %TRUE for negative 2195 * 2196 * In case of success %0 is returned and @buf and @size are updated with 2197 * the amount of bytes written. 2198 */ 2199 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2200 bool neg) 2201 { 2202 int len; 2203 char tmp[TMPBUFLEN], *p = tmp; 2204 2205 sprintf(p, "%s%lu", neg ? "-" : "", val); 2206 len = strlen(tmp); 2207 if (len > *size) 2208 len = *size; 2209 if (copy_to_user(*buf, tmp, len)) 2210 return -EFAULT; 2211 *size -= len; 2212 *buf += len; 2213 return 0; 2214 } 2215 #undef TMPBUFLEN 2216 2217 static int proc_put_char(void __user **buf, size_t *size, char c) 2218 { 2219 if (*size) { 2220 char __user **buffer = (char __user **)buf; 2221 if (put_user(c, *buffer)) 2222 return -EFAULT; 2223 (*size)--, (*buffer)++; 2224 *buf = *buffer; 2225 } 2226 return 0; 2227 } 2228 2229 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2230 int *valp, 2231 int write, void *data) 2232 { 2233 if (write) { 2234 *valp = *negp ? -*lvalp : *lvalp; 2235 } else { 2236 int val = *valp; 2237 if (val < 0) { 2238 *negp = true; 2239 *lvalp = (unsigned long)-val; 2240 } else { 2241 *negp = false; 2242 *lvalp = (unsigned long)val; 2243 } 2244 } 2245 return 0; 2246 } 2247 2248 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2249 2250 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2251 int write, void __user *buffer, 2252 size_t *lenp, loff_t *ppos, 2253 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2254 int write, void *data), 2255 void *data) 2256 { 2257 int *i, vleft, first = 1, err = 0; 2258 unsigned long page = 0; 2259 size_t left; 2260 char *kbuf; 2261 2262 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2263 *lenp = 0; 2264 return 0; 2265 } 2266 2267 i = (int *) tbl_data; 2268 vleft = table->maxlen / sizeof(*i); 2269 left = *lenp; 2270 2271 if (!conv) 2272 conv = do_proc_dointvec_conv; 2273 2274 if (write) { 2275 if (left > PAGE_SIZE - 1) 2276 left = PAGE_SIZE - 1; 2277 page = __get_free_page(GFP_TEMPORARY); 2278 kbuf = (char *) page; 2279 if (!kbuf) 2280 return -ENOMEM; 2281 if (copy_from_user(kbuf, buffer, left)) { 2282 err = -EFAULT; 2283 goto free; 2284 } 2285 kbuf[left] = 0; 2286 } 2287 2288 for (; left && vleft--; i++, first=0) { 2289 unsigned long lval; 2290 bool neg; 2291 2292 if (write) { 2293 left -= proc_skip_spaces(&kbuf); 2294 2295 if (!left) 2296 break; 2297 err = proc_get_long(&kbuf, &left, &lval, &neg, 2298 proc_wspace_sep, 2299 sizeof(proc_wspace_sep), NULL); 2300 if (err) 2301 break; 2302 if (conv(&neg, &lval, i, 1, data)) { 2303 err = -EINVAL; 2304 break; 2305 } 2306 } else { 2307 if (conv(&neg, &lval, i, 0, data)) { 2308 err = -EINVAL; 2309 break; 2310 } 2311 if (!first) 2312 err = proc_put_char(&buffer, &left, '\t'); 2313 if (err) 2314 break; 2315 err = proc_put_long(&buffer, &left, lval, neg); 2316 if (err) 2317 break; 2318 } 2319 } 2320 2321 if (!write && !first && left && !err) 2322 err = proc_put_char(&buffer, &left, '\n'); 2323 if (write && !err && left) 2324 left -= proc_skip_spaces(&kbuf); 2325 free: 2326 if (write) { 2327 free_page(page); 2328 if (first) 2329 return err ? : -EINVAL; 2330 } 2331 *lenp -= left; 2332 *ppos += *lenp; 2333 return err; 2334 } 2335 2336 static int do_proc_dointvec(struct ctl_table *table, int write, 2337 void __user *buffer, size_t *lenp, loff_t *ppos, 2338 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2339 int write, void *data), 2340 void *data) 2341 { 2342 return __do_proc_dointvec(table->data, table, write, 2343 buffer, lenp, ppos, conv, data); 2344 } 2345 2346 /** 2347 * proc_dointvec - read a vector of integers 2348 * @table: the sysctl table 2349 * @write: %TRUE if this is a write to the sysctl file 2350 * @buffer: the user buffer 2351 * @lenp: the size of the user buffer 2352 * @ppos: file position 2353 * 2354 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2355 * values from/to the user buffer, treated as an ASCII string. 2356 * 2357 * Returns 0 on success. 2358 */ 2359 int proc_dointvec(struct ctl_table *table, int write, 2360 void __user *buffer, size_t *lenp, loff_t *ppos) 2361 { 2362 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2363 NULL,NULL); 2364 } 2365 2366 /* 2367 * Taint values can only be increased 2368 * This means we can safely use a temporary. 2369 */ 2370 static int proc_taint(struct ctl_table *table, int write, 2371 void __user *buffer, size_t *lenp, loff_t *ppos) 2372 { 2373 struct ctl_table t; 2374 unsigned long tmptaint = get_taint(); 2375 int err; 2376 2377 if (write && !capable(CAP_SYS_ADMIN)) 2378 return -EPERM; 2379 2380 t = *table; 2381 t.data = &tmptaint; 2382 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2383 if (err < 0) 2384 return err; 2385 2386 if (write) { 2387 /* 2388 * Poor man's atomic or. Not worth adding a primitive 2389 * to everyone's atomic.h for this 2390 */ 2391 int i; 2392 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2393 if ((tmptaint >> i) & 1) 2394 add_taint(i); 2395 } 2396 } 2397 2398 return err; 2399 } 2400 2401 struct do_proc_dointvec_minmax_conv_param { 2402 int *min; 2403 int *max; 2404 }; 2405 2406 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2407 int *valp, 2408 int write, void *data) 2409 { 2410 struct do_proc_dointvec_minmax_conv_param *param = data; 2411 if (write) { 2412 int val = *negp ? -*lvalp : *lvalp; 2413 if ((param->min && *param->min > val) || 2414 (param->max && *param->max < val)) 2415 return -EINVAL; 2416 *valp = val; 2417 } else { 2418 int val = *valp; 2419 if (val < 0) { 2420 *negp = true; 2421 *lvalp = (unsigned long)-val; 2422 } else { 2423 *negp = false; 2424 *lvalp = (unsigned long)val; 2425 } 2426 } 2427 return 0; 2428 } 2429 2430 /** 2431 * proc_dointvec_minmax - read a vector of integers with min/max values 2432 * @table: the sysctl table 2433 * @write: %TRUE if this is a write to the sysctl file 2434 * @buffer: the user buffer 2435 * @lenp: the size of the user buffer 2436 * @ppos: file position 2437 * 2438 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2439 * values from/to the user buffer, treated as an ASCII string. 2440 * 2441 * This routine will ensure the values are within the range specified by 2442 * table->extra1 (min) and table->extra2 (max). 2443 * 2444 * Returns 0 on success. 2445 */ 2446 int proc_dointvec_minmax(struct ctl_table *table, int write, 2447 void __user *buffer, size_t *lenp, loff_t *ppos) 2448 { 2449 struct do_proc_dointvec_minmax_conv_param param = { 2450 .min = (int *) table->extra1, 2451 .max = (int *) table->extra2, 2452 }; 2453 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2454 do_proc_dointvec_minmax_conv, ¶m); 2455 } 2456 2457 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2458 void __user *buffer, 2459 size_t *lenp, loff_t *ppos, 2460 unsigned long convmul, 2461 unsigned long convdiv) 2462 { 2463 unsigned long *i, *min, *max; 2464 int vleft, first = 1, err = 0; 2465 unsigned long page = 0; 2466 size_t left; 2467 char *kbuf; 2468 2469 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2470 *lenp = 0; 2471 return 0; 2472 } 2473 2474 i = (unsigned long *) data; 2475 min = (unsigned long *) table->extra1; 2476 max = (unsigned long *) table->extra2; 2477 vleft = table->maxlen / sizeof(unsigned long); 2478 left = *lenp; 2479 2480 if (write) { 2481 if (left > PAGE_SIZE - 1) 2482 left = PAGE_SIZE - 1; 2483 page = __get_free_page(GFP_TEMPORARY); 2484 kbuf = (char *) page; 2485 if (!kbuf) 2486 return -ENOMEM; 2487 if (copy_from_user(kbuf, buffer, left)) { 2488 err = -EFAULT; 2489 goto free; 2490 } 2491 kbuf[left] = 0; 2492 } 2493 2494 for (; left && vleft--; i++, first = 0) { 2495 unsigned long val; 2496 2497 if (write) { 2498 bool neg; 2499 2500 left -= proc_skip_spaces(&kbuf); 2501 2502 err = proc_get_long(&kbuf, &left, &val, &neg, 2503 proc_wspace_sep, 2504 sizeof(proc_wspace_sep), NULL); 2505 if (err) 2506 break; 2507 if (neg) 2508 continue; 2509 if ((min && val < *min) || (max && val > *max)) 2510 continue; 2511 *i = val; 2512 } else { 2513 val = convdiv * (*i) / convmul; 2514 if (!first) 2515 err = proc_put_char(&buffer, &left, '\t'); 2516 err = proc_put_long(&buffer, &left, val, false); 2517 if (err) 2518 break; 2519 } 2520 } 2521 2522 if (!write && !first && left && !err) 2523 err = proc_put_char(&buffer, &left, '\n'); 2524 if (write && !err) 2525 left -= proc_skip_spaces(&kbuf); 2526 free: 2527 if (write) { 2528 free_page(page); 2529 if (first) 2530 return err ? : -EINVAL; 2531 } 2532 *lenp -= left; 2533 *ppos += *lenp; 2534 return err; 2535 } 2536 2537 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2538 void __user *buffer, 2539 size_t *lenp, loff_t *ppos, 2540 unsigned long convmul, 2541 unsigned long convdiv) 2542 { 2543 return __do_proc_doulongvec_minmax(table->data, table, write, 2544 buffer, lenp, ppos, convmul, convdiv); 2545 } 2546 2547 /** 2548 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2549 * @table: the sysctl table 2550 * @write: %TRUE if this is a write to the sysctl file 2551 * @buffer: the user buffer 2552 * @lenp: the size of the user buffer 2553 * @ppos: file position 2554 * 2555 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2556 * values from/to the user buffer, treated as an ASCII string. 2557 * 2558 * This routine will ensure the values are within the range specified by 2559 * table->extra1 (min) and table->extra2 (max). 2560 * 2561 * Returns 0 on success. 2562 */ 2563 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2564 void __user *buffer, size_t *lenp, loff_t *ppos) 2565 { 2566 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2567 } 2568 2569 /** 2570 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2571 * @table: the sysctl table 2572 * @write: %TRUE if this is a write to the sysctl file 2573 * @buffer: the user buffer 2574 * @lenp: the size of the user buffer 2575 * @ppos: file position 2576 * 2577 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2578 * values from/to the user buffer, treated as an ASCII string. The values 2579 * are treated as milliseconds, and converted to jiffies when they are stored. 2580 * 2581 * This routine will ensure the values are within the range specified by 2582 * table->extra1 (min) and table->extra2 (max). 2583 * 2584 * Returns 0 on success. 2585 */ 2586 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2587 void __user *buffer, 2588 size_t *lenp, loff_t *ppos) 2589 { 2590 return do_proc_doulongvec_minmax(table, write, buffer, 2591 lenp, ppos, HZ, 1000l); 2592 } 2593 2594 2595 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2596 int *valp, 2597 int write, void *data) 2598 { 2599 if (write) { 2600 if (*lvalp > LONG_MAX / HZ) 2601 return 1; 2602 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2603 } else { 2604 int val = *valp; 2605 unsigned long lval; 2606 if (val < 0) { 2607 *negp = true; 2608 lval = (unsigned long)-val; 2609 } else { 2610 *negp = false; 2611 lval = (unsigned long)val; 2612 } 2613 *lvalp = lval / HZ; 2614 } 2615 return 0; 2616 } 2617 2618 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2619 int *valp, 2620 int write, void *data) 2621 { 2622 if (write) { 2623 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2624 return 1; 2625 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2626 } else { 2627 int val = *valp; 2628 unsigned long lval; 2629 if (val < 0) { 2630 *negp = true; 2631 lval = (unsigned long)-val; 2632 } else { 2633 *negp = false; 2634 lval = (unsigned long)val; 2635 } 2636 *lvalp = jiffies_to_clock_t(lval); 2637 } 2638 return 0; 2639 } 2640 2641 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2642 int *valp, 2643 int write, void *data) 2644 { 2645 if (write) { 2646 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2647 } else { 2648 int val = *valp; 2649 unsigned long lval; 2650 if (val < 0) { 2651 *negp = true; 2652 lval = (unsigned long)-val; 2653 } else { 2654 *negp = false; 2655 lval = (unsigned long)val; 2656 } 2657 *lvalp = jiffies_to_msecs(lval); 2658 } 2659 return 0; 2660 } 2661 2662 /** 2663 * proc_dointvec_jiffies - read a vector of integers as seconds 2664 * @table: the sysctl table 2665 * @write: %TRUE if this is a write to the sysctl file 2666 * @buffer: the user buffer 2667 * @lenp: the size of the user buffer 2668 * @ppos: file position 2669 * 2670 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2671 * values from/to the user buffer, treated as an ASCII string. 2672 * The values read are assumed to be in seconds, and are converted into 2673 * jiffies. 2674 * 2675 * Returns 0 on success. 2676 */ 2677 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2678 void __user *buffer, size_t *lenp, loff_t *ppos) 2679 { 2680 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2681 do_proc_dointvec_jiffies_conv,NULL); 2682 } 2683 2684 /** 2685 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2686 * @table: the sysctl table 2687 * @write: %TRUE if this is a write to the sysctl file 2688 * @buffer: the user buffer 2689 * @lenp: the size of the user buffer 2690 * @ppos: pointer to the file position 2691 * 2692 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2693 * values from/to the user buffer, treated as an ASCII string. 2694 * The values read are assumed to be in 1/USER_HZ seconds, and 2695 * are converted into jiffies. 2696 * 2697 * Returns 0 on success. 2698 */ 2699 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2700 void __user *buffer, size_t *lenp, loff_t *ppos) 2701 { 2702 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2703 do_proc_dointvec_userhz_jiffies_conv,NULL); 2704 } 2705 2706 /** 2707 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2708 * @table: the sysctl table 2709 * @write: %TRUE if this is a write to the sysctl file 2710 * @buffer: the user buffer 2711 * @lenp: the size of the user buffer 2712 * @ppos: file position 2713 * @ppos: the current position in the file 2714 * 2715 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2716 * values from/to the user buffer, treated as an ASCII string. 2717 * The values read are assumed to be in 1/1000 seconds, and 2718 * are converted into jiffies. 2719 * 2720 * Returns 0 on success. 2721 */ 2722 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2723 void __user *buffer, size_t *lenp, loff_t *ppos) 2724 { 2725 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2726 do_proc_dointvec_ms_jiffies_conv, NULL); 2727 } 2728 2729 static int proc_do_cad_pid(struct ctl_table *table, int write, 2730 void __user *buffer, size_t *lenp, loff_t *ppos) 2731 { 2732 struct pid *new_pid; 2733 pid_t tmp; 2734 int r; 2735 2736 tmp = pid_vnr(cad_pid); 2737 2738 r = __do_proc_dointvec(&tmp, table, write, buffer, 2739 lenp, ppos, NULL, NULL); 2740 if (r || !write) 2741 return r; 2742 2743 new_pid = find_get_pid(tmp); 2744 if (!new_pid) 2745 return -ESRCH; 2746 2747 put_pid(xchg(&cad_pid, new_pid)); 2748 return 0; 2749 } 2750 2751 /** 2752 * proc_do_large_bitmap - read/write from/to a large bitmap 2753 * @table: the sysctl table 2754 * @write: %TRUE if this is a write to the sysctl file 2755 * @buffer: the user buffer 2756 * @lenp: the size of the user buffer 2757 * @ppos: file position 2758 * 2759 * The bitmap is stored at table->data and the bitmap length (in bits) 2760 * in table->maxlen. 2761 * 2762 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2763 * large bitmaps may be represented in a compact manner. Writing into 2764 * the file will clear the bitmap then update it with the given input. 2765 * 2766 * Returns 0 on success. 2767 */ 2768 int proc_do_large_bitmap(struct ctl_table *table, int write, 2769 void __user *buffer, size_t *lenp, loff_t *ppos) 2770 { 2771 int err = 0; 2772 bool first = 1; 2773 size_t left = *lenp; 2774 unsigned long bitmap_len = table->maxlen; 2775 unsigned long *bitmap = (unsigned long *) table->data; 2776 unsigned long *tmp_bitmap = NULL; 2777 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2778 2779 if (!bitmap_len || !left || (*ppos && !write)) { 2780 *lenp = 0; 2781 return 0; 2782 } 2783 2784 if (write) { 2785 unsigned long page = 0; 2786 char *kbuf; 2787 2788 if (left > PAGE_SIZE - 1) 2789 left = PAGE_SIZE - 1; 2790 2791 page = __get_free_page(GFP_TEMPORARY); 2792 kbuf = (char *) page; 2793 if (!kbuf) 2794 return -ENOMEM; 2795 if (copy_from_user(kbuf, buffer, left)) { 2796 free_page(page); 2797 return -EFAULT; 2798 } 2799 kbuf[left] = 0; 2800 2801 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2802 GFP_KERNEL); 2803 if (!tmp_bitmap) { 2804 free_page(page); 2805 return -ENOMEM; 2806 } 2807 proc_skip_char(&kbuf, &left, '\n'); 2808 while (!err && left) { 2809 unsigned long val_a, val_b; 2810 bool neg; 2811 2812 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2813 sizeof(tr_a), &c); 2814 if (err) 2815 break; 2816 if (val_a >= bitmap_len || neg) { 2817 err = -EINVAL; 2818 break; 2819 } 2820 2821 val_b = val_a; 2822 if (left) { 2823 kbuf++; 2824 left--; 2825 } 2826 2827 if (c == '-') { 2828 err = proc_get_long(&kbuf, &left, &val_b, 2829 &neg, tr_b, sizeof(tr_b), 2830 &c); 2831 if (err) 2832 break; 2833 if (val_b >= bitmap_len || neg || 2834 val_a > val_b) { 2835 err = -EINVAL; 2836 break; 2837 } 2838 if (left) { 2839 kbuf++; 2840 left--; 2841 } 2842 } 2843 2844 while (val_a <= val_b) 2845 set_bit(val_a++, tmp_bitmap); 2846 2847 first = 0; 2848 proc_skip_char(&kbuf, &left, '\n'); 2849 } 2850 free_page(page); 2851 } else { 2852 unsigned long bit_a, bit_b = 0; 2853 2854 while (left) { 2855 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2856 if (bit_a >= bitmap_len) 2857 break; 2858 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2859 bit_a + 1) - 1; 2860 2861 if (!first) { 2862 err = proc_put_char(&buffer, &left, ','); 2863 if (err) 2864 break; 2865 } 2866 err = proc_put_long(&buffer, &left, bit_a, false); 2867 if (err) 2868 break; 2869 if (bit_a != bit_b) { 2870 err = proc_put_char(&buffer, &left, '-'); 2871 if (err) 2872 break; 2873 err = proc_put_long(&buffer, &left, bit_b, false); 2874 if (err) 2875 break; 2876 } 2877 2878 first = 0; bit_b++; 2879 } 2880 if (!err) 2881 err = proc_put_char(&buffer, &left, '\n'); 2882 } 2883 2884 if (!err) { 2885 if (write) { 2886 if (*ppos) 2887 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2888 else 2889 memcpy(bitmap, tmp_bitmap, 2890 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2891 } 2892 kfree(tmp_bitmap); 2893 *lenp -= left; 2894 *ppos += *lenp; 2895 return 0; 2896 } else { 2897 kfree(tmp_bitmap); 2898 return err; 2899 } 2900 } 2901 2902 #else /* CONFIG_PROC_FS */ 2903 2904 int proc_dostring(struct ctl_table *table, int write, 2905 void __user *buffer, size_t *lenp, loff_t *ppos) 2906 { 2907 return -ENOSYS; 2908 } 2909 2910 int proc_dointvec(struct ctl_table *table, int write, 2911 void __user *buffer, size_t *lenp, loff_t *ppos) 2912 { 2913 return -ENOSYS; 2914 } 2915 2916 int proc_dointvec_minmax(struct ctl_table *table, int write, 2917 void __user *buffer, size_t *lenp, loff_t *ppos) 2918 { 2919 return -ENOSYS; 2920 } 2921 2922 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2923 void __user *buffer, size_t *lenp, loff_t *ppos) 2924 { 2925 return -ENOSYS; 2926 } 2927 2928 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2929 void __user *buffer, size_t *lenp, loff_t *ppos) 2930 { 2931 return -ENOSYS; 2932 } 2933 2934 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2935 void __user *buffer, size_t *lenp, loff_t *ppos) 2936 { 2937 return -ENOSYS; 2938 } 2939 2940 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2941 void __user *buffer, size_t *lenp, loff_t *ppos) 2942 { 2943 return -ENOSYS; 2944 } 2945 2946 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2947 void __user *buffer, 2948 size_t *lenp, loff_t *ppos) 2949 { 2950 return -ENOSYS; 2951 } 2952 2953 2954 #endif /* CONFIG_PROC_FS */ 2955 2956 /* 2957 * No sense putting this after each symbol definition, twice, 2958 * exception granted :-) 2959 */ 2960 EXPORT_SYMBOL(proc_dointvec); 2961 EXPORT_SYMBOL(proc_dointvec_jiffies); 2962 EXPORT_SYMBOL(proc_dointvec_minmax); 2963 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2964 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2965 EXPORT_SYMBOL(proc_dostring); 2966 EXPORT_SYMBOL(proc_doulongvec_minmax); 2967 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2968 EXPORT_SYMBOL(register_sysctl_table); 2969 EXPORT_SYMBOL(register_sysctl_paths); 2970 EXPORT_SYMBOL(unregister_sysctl_table); 2971