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 #include <linux/kmod.h> 60 61 #include <asm/uaccess.h> 62 #include <asm/processor.h> 63 64 #ifdef CONFIG_X86 65 #include <asm/nmi.h> 66 #include <asm/stacktrace.h> 67 #include <asm/io.h> 68 #endif 69 #ifdef CONFIG_BSD_PROCESS_ACCT 70 #include <linux/acct.h> 71 #endif 72 #ifdef CONFIG_RT_MUTEXES 73 #include <linux/rtmutex.h> 74 #endif 75 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 76 #include <linux/lockdep.h> 77 #endif 78 #ifdef CONFIG_CHR_DEV_SG 79 #include <scsi/sg.h> 80 #endif 81 82 #ifdef CONFIG_LOCKUP_DETECTOR 83 #include <linux/nmi.h> 84 #endif 85 86 87 #if defined(CONFIG_SYSCTL) 88 89 /* External variables not in a header file. */ 90 extern int sysctl_overcommit_memory; 91 extern int sysctl_overcommit_ratio; 92 extern int max_threads; 93 extern int core_uses_pid; 94 extern int suid_dumpable; 95 extern char core_pattern[]; 96 extern unsigned int core_pipe_limit; 97 extern int pid_max; 98 extern int min_free_kbytes; 99 extern int pid_max_min, pid_max_max; 100 extern int sysctl_drop_caches; 101 extern int percpu_pagelist_fraction; 102 extern int compat_log; 103 extern int latencytop_enabled; 104 extern int sysctl_nr_open_min, sysctl_nr_open_max; 105 #ifndef CONFIG_MMU 106 extern int sysctl_nr_trim_pages; 107 #endif 108 #ifdef CONFIG_BLOCK 109 extern int blk_iopoll_enabled; 110 #endif 111 112 /* Constants used for minimum and maximum */ 113 #ifdef CONFIG_LOCKUP_DETECTOR 114 static int sixty = 60; 115 static int neg_one = -1; 116 #endif 117 118 static int zero; 119 static int __maybe_unused one = 1; 120 static int __maybe_unused two = 2; 121 static int __maybe_unused three = 3; 122 static unsigned long one_ul = 1; 123 static int one_hundred = 100; 124 #ifdef CONFIG_PRINTK 125 static int ten_thousand = 10000; 126 #endif 127 128 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 129 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 130 131 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 132 static int maxolduid = 65535; 133 static int minolduid; 134 static int min_percpu_pagelist_fract = 8; 135 136 static int ngroups_max = NGROUPS_MAX; 137 138 #ifdef CONFIG_INOTIFY_USER 139 #include <linux/inotify.h> 140 #endif 141 #ifdef CONFIG_SPARC 142 #include <asm/system.h> 143 #endif 144 145 #ifdef CONFIG_SPARC64 146 extern int sysctl_tsb_ratio; 147 #endif 148 149 #ifdef __hppa__ 150 extern int pwrsw_enabled; 151 extern int unaligned_enabled; 152 #endif 153 154 #ifdef CONFIG_S390 155 #ifdef CONFIG_MATHEMU 156 extern int sysctl_ieee_emulation_warnings; 157 #endif 158 extern int sysctl_userprocess_debug; 159 extern int spin_retry; 160 #endif 161 162 #ifdef CONFIG_IA64 163 extern int no_unaligned_warning; 164 extern int unaligned_dump_stack; 165 #endif 166 167 #ifdef CONFIG_PROC_SYSCTL 168 static int proc_do_cad_pid(struct ctl_table *table, int write, 169 void __user *buffer, size_t *lenp, loff_t *ppos); 170 static int proc_taint(struct ctl_table *table, int write, 171 void __user *buffer, size_t *lenp, loff_t *ppos); 172 #endif 173 174 #ifdef CONFIG_PRINTK 175 static int proc_dmesg_restrict(struct ctl_table *table, int write, 176 void __user *buffer, size_t *lenp, loff_t *ppos); 177 #endif 178 179 #ifdef CONFIG_MAGIC_SYSRQ 180 /* Note: sysrq code uses it's own private copy */ 181 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 182 183 static int sysrq_sysctl_handler(ctl_table *table, int write, 184 void __user *buffer, size_t *lenp, 185 loff_t *ppos) 186 { 187 int error; 188 189 error = proc_dointvec(table, write, buffer, lenp, ppos); 190 if (error) 191 return error; 192 193 if (write) 194 sysrq_toggle_support(__sysrq_enabled); 195 196 return 0; 197 } 198 199 #endif 200 201 static struct ctl_table root_table[]; 202 static struct ctl_table_root sysctl_table_root; 203 static struct ctl_table_header root_table_header = { 204 {{.count = 1, 205 .ctl_table = root_table, 206 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, 207 .root = &sysctl_table_root, 208 .set = &sysctl_table_root.default_set, 209 }; 210 static struct ctl_table_root sysctl_table_root = { 211 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 212 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 213 }; 214 215 static struct ctl_table kern_table[]; 216 static struct ctl_table vm_table[]; 217 static struct ctl_table fs_table[]; 218 static struct ctl_table debug_table[]; 219 static struct ctl_table dev_table[]; 220 extern struct ctl_table random_table[]; 221 #ifdef CONFIG_EPOLL 222 extern struct ctl_table epoll_table[]; 223 #endif 224 225 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 226 int sysctl_legacy_va_layout; 227 #endif 228 229 /* The default sysctl tables: */ 230 231 static struct ctl_table root_table[] = { 232 { 233 .procname = "kernel", 234 .mode = 0555, 235 .child = kern_table, 236 }, 237 { 238 .procname = "vm", 239 .mode = 0555, 240 .child = vm_table, 241 }, 242 { 243 .procname = "fs", 244 .mode = 0555, 245 .child = fs_table, 246 }, 247 { 248 .procname = "debug", 249 .mode = 0555, 250 .child = debug_table, 251 }, 252 { 253 .procname = "dev", 254 .mode = 0555, 255 .child = dev_table, 256 }, 257 { } 258 }; 259 260 #ifdef CONFIG_SCHED_DEBUG 261 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 262 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 263 static int min_wakeup_granularity_ns; /* 0 usecs */ 264 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 265 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 266 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 267 #endif 268 269 #ifdef CONFIG_COMPACTION 270 static int min_extfrag_threshold; 271 static int max_extfrag_threshold = 1000; 272 #endif 273 274 static struct ctl_table kern_table[] = { 275 { 276 .procname = "sched_child_runs_first", 277 .data = &sysctl_sched_child_runs_first, 278 .maxlen = sizeof(unsigned int), 279 .mode = 0644, 280 .proc_handler = proc_dointvec, 281 }, 282 #ifdef CONFIG_SCHED_DEBUG 283 { 284 .procname = "sched_min_granularity_ns", 285 .data = &sysctl_sched_min_granularity, 286 .maxlen = sizeof(unsigned int), 287 .mode = 0644, 288 .proc_handler = sched_proc_update_handler, 289 .extra1 = &min_sched_granularity_ns, 290 .extra2 = &max_sched_granularity_ns, 291 }, 292 { 293 .procname = "sched_latency_ns", 294 .data = &sysctl_sched_latency, 295 .maxlen = sizeof(unsigned int), 296 .mode = 0644, 297 .proc_handler = sched_proc_update_handler, 298 .extra1 = &min_sched_granularity_ns, 299 .extra2 = &max_sched_granularity_ns, 300 }, 301 { 302 .procname = "sched_wakeup_granularity_ns", 303 .data = &sysctl_sched_wakeup_granularity, 304 .maxlen = sizeof(unsigned int), 305 .mode = 0644, 306 .proc_handler = sched_proc_update_handler, 307 .extra1 = &min_wakeup_granularity_ns, 308 .extra2 = &max_wakeup_granularity_ns, 309 }, 310 { 311 .procname = "sched_tunable_scaling", 312 .data = &sysctl_sched_tunable_scaling, 313 .maxlen = sizeof(enum sched_tunable_scaling), 314 .mode = 0644, 315 .proc_handler = sched_proc_update_handler, 316 .extra1 = &min_sched_tunable_scaling, 317 .extra2 = &max_sched_tunable_scaling, 318 }, 319 { 320 .procname = "sched_migration_cost", 321 .data = &sysctl_sched_migration_cost, 322 .maxlen = sizeof(unsigned int), 323 .mode = 0644, 324 .proc_handler = proc_dointvec, 325 }, 326 { 327 .procname = "sched_nr_migrate", 328 .data = &sysctl_sched_nr_migrate, 329 .maxlen = sizeof(unsigned int), 330 .mode = 0644, 331 .proc_handler = proc_dointvec, 332 }, 333 { 334 .procname = "sched_time_avg", 335 .data = &sysctl_sched_time_avg, 336 .maxlen = sizeof(unsigned int), 337 .mode = 0644, 338 .proc_handler = proc_dointvec, 339 }, 340 { 341 .procname = "sched_shares_window", 342 .data = &sysctl_sched_shares_window, 343 .maxlen = sizeof(unsigned int), 344 .mode = 0644, 345 .proc_handler = proc_dointvec, 346 }, 347 { 348 .procname = "timer_migration", 349 .data = &sysctl_timer_migration, 350 .maxlen = sizeof(unsigned int), 351 .mode = 0644, 352 .proc_handler = proc_dointvec_minmax, 353 .extra1 = &zero, 354 .extra2 = &one, 355 }, 356 #endif 357 { 358 .procname = "sched_rt_period_us", 359 .data = &sysctl_sched_rt_period, 360 .maxlen = sizeof(unsigned int), 361 .mode = 0644, 362 .proc_handler = sched_rt_handler, 363 }, 364 { 365 .procname = "sched_rt_runtime_us", 366 .data = &sysctl_sched_rt_runtime, 367 .maxlen = sizeof(int), 368 .mode = 0644, 369 .proc_handler = sched_rt_handler, 370 }, 371 #ifdef CONFIG_SCHED_AUTOGROUP 372 { 373 .procname = "sched_autogroup_enabled", 374 .data = &sysctl_sched_autogroup_enabled, 375 .maxlen = sizeof(unsigned int), 376 .mode = 0644, 377 .proc_handler = proc_dointvec_minmax, 378 .extra1 = &zero, 379 .extra2 = &one, 380 }, 381 #endif 382 #ifdef CONFIG_PROVE_LOCKING 383 { 384 .procname = "prove_locking", 385 .data = &prove_locking, 386 .maxlen = sizeof(int), 387 .mode = 0644, 388 .proc_handler = proc_dointvec, 389 }, 390 #endif 391 #ifdef CONFIG_LOCK_STAT 392 { 393 .procname = "lock_stat", 394 .data = &lock_stat, 395 .maxlen = sizeof(int), 396 .mode = 0644, 397 .proc_handler = proc_dointvec, 398 }, 399 #endif 400 { 401 .procname = "panic", 402 .data = &panic_timeout, 403 .maxlen = sizeof(int), 404 .mode = 0644, 405 .proc_handler = proc_dointvec, 406 }, 407 { 408 .procname = "core_uses_pid", 409 .data = &core_uses_pid, 410 .maxlen = sizeof(int), 411 .mode = 0644, 412 .proc_handler = proc_dointvec, 413 }, 414 { 415 .procname = "core_pattern", 416 .data = core_pattern, 417 .maxlen = CORENAME_MAX_SIZE, 418 .mode = 0644, 419 .proc_handler = proc_dostring, 420 }, 421 { 422 .procname = "core_pipe_limit", 423 .data = &core_pipe_limit, 424 .maxlen = sizeof(unsigned int), 425 .mode = 0644, 426 .proc_handler = proc_dointvec, 427 }, 428 #ifdef CONFIG_PROC_SYSCTL 429 { 430 .procname = "tainted", 431 .maxlen = sizeof(long), 432 .mode = 0644, 433 .proc_handler = proc_taint, 434 }, 435 #endif 436 #ifdef CONFIG_LATENCYTOP 437 { 438 .procname = "latencytop", 439 .data = &latencytop_enabled, 440 .maxlen = sizeof(int), 441 .mode = 0644, 442 .proc_handler = proc_dointvec, 443 }, 444 #endif 445 #ifdef CONFIG_BLK_DEV_INITRD 446 { 447 .procname = "real-root-dev", 448 .data = &real_root_dev, 449 .maxlen = sizeof(int), 450 .mode = 0644, 451 .proc_handler = proc_dointvec, 452 }, 453 #endif 454 { 455 .procname = "print-fatal-signals", 456 .data = &print_fatal_signals, 457 .maxlen = sizeof(int), 458 .mode = 0644, 459 .proc_handler = proc_dointvec, 460 }, 461 #ifdef CONFIG_SPARC 462 { 463 .procname = "reboot-cmd", 464 .data = reboot_command, 465 .maxlen = 256, 466 .mode = 0644, 467 .proc_handler = proc_dostring, 468 }, 469 { 470 .procname = "stop-a", 471 .data = &stop_a_enabled, 472 .maxlen = sizeof (int), 473 .mode = 0644, 474 .proc_handler = proc_dointvec, 475 }, 476 { 477 .procname = "scons-poweroff", 478 .data = &scons_pwroff, 479 .maxlen = sizeof (int), 480 .mode = 0644, 481 .proc_handler = proc_dointvec, 482 }, 483 #endif 484 #ifdef CONFIG_SPARC64 485 { 486 .procname = "tsb-ratio", 487 .data = &sysctl_tsb_ratio, 488 .maxlen = sizeof (int), 489 .mode = 0644, 490 .proc_handler = proc_dointvec, 491 }, 492 #endif 493 #ifdef __hppa__ 494 { 495 .procname = "soft-power", 496 .data = &pwrsw_enabled, 497 .maxlen = sizeof (int), 498 .mode = 0644, 499 .proc_handler = proc_dointvec, 500 }, 501 { 502 .procname = "unaligned-trap", 503 .data = &unaligned_enabled, 504 .maxlen = sizeof (int), 505 .mode = 0644, 506 .proc_handler = proc_dointvec, 507 }, 508 #endif 509 { 510 .procname = "ctrl-alt-del", 511 .data = &C_A_D, 512 .maxlen = sizeof(int), 513 .mode = 0644, 514 .proc_handler = proc_dointvec, 515 }, 516 #ifdef CONFIG_FUNCTION_TRACER 517 { 518 .procname = "ftrace_enabled", 519 .data = &ftrace_enabled, 520 .maxlen = sizeof(int), 521 .mode = 0644, 522 .proc_handler = ftrace_enable_sysctl, 523 }, 524 #endif 525 #ifdef CONFIG_STACK_TRACER 526 { 527 .procname = "stack_tracer_enabled", 528 .data = &stack_tracer_enabled, 529 .maxlen = sizeof(int), 530 .mode = 0644, 531 .proc_handler = stack_trace_sysctl, 532 }, 533 #endif 534 #ifdef CONFIG_TRACING 535 { 536 .procname = "ftrace_dump_on_oops", 537 .data = &ftrace_dump_on_oops, 538 .maxlen = sizeof(int), 539 .mode = 0644, 540 .proc_handler = proc_dointvec, 541 }, 542 #endif 543 #ifdef CONFIG_MODULES 544 { 545 .procname = "modprobe", 546 .data = &modprobe_path, 547 .maxlen = KMOD_PATH_LEN, 548 .mode = 0644, 549 .proc_handler = proc_dostring, 550 }, 551 { 552 .procname = "modules_disabled", 553 .data = &modules_disabled, 554 .maxlen = sizeof(int), 555 .mode = 0644, 556 /* only handle a transition from default "0" to "1" */ 557 .proc_handler = proc_dointvec_minmax, 558 .extra1 = &one, 559 .extra2 = &one, 560 }, 561 #endif 562 #ifdef CONFIG_HOTPLUG 563 { 564 .procname = "hotplug", 565 .data = &uevent_helper, 566 .maxlen = UEVENT_HELPER_PATH_LEN, 567 .mode = 0644, 568 .proc_handler = proc_dostring, 569 }, 570 #endif 571 #ifdef CONFIG_CHR_DEV_SG 572 { 573 .procname = "sg-big-buff", 574 .data = &sg_big_buff, 575 .maxlen = sizeof (int), 576 .mode = 0444, 577 .proc_handler = proc_dointvec, 578 }, 579 #endif 580 #ifdef CONFIG_BSD_PROCESS_ACCT 581 { 582 .procname = "acct", 583 .data = &acct_parm, 584 .maxlen = 3*sizeof(int), 585 .mode = 0644, 586 .proc_handler = proc_dointvec, 587 }, 588 #endif 589 #ifdef CONFIG_MAGIC_SYSRQ 590 { 591 .procname = "sysrq", 592 .data = &__sysrq_enabled, 593 .maxlen = sizeof (int), 594 .mode = 0644, 595 .proc_handler = sysrq_sysctl_handler, 596 }, 597 #endif 598 #ifdef CONFIG_PROC_SYSCTL 599 { 600 .procname = "cad_pid", 601 .data = NULL, 602 .maxlen = sizeof (int), 603 .mode = 0600, 604 .proc_handler = proc_do_cad_pid, 605 }, 606 #endif 607 { 608 .procname = "threads-max", 609 .data = &max_threads, 610 .maxlen = sizeof(int), 611 .mode = 0644, 612 .proc_handler = proc_dointvec, 613 }, 614 { 615 .procname = "random", 616 .mode = 0555, 617 .child = random_table, 618 }, 619 { 620 .procname = "usermodehelper", 621 .mode = 0555, 622 .child = usermodehelper_table, 623 }, 624 { 625 .procname = "overflowuid", 626 .data = &overflowuid, 627 .maxlen = sizeof(int), 628 .mode = 0644, 629 .proc_handler = proc_dointvec_minmax, 630 .extra1 = &minolduid, 631 .extra2 = &maxolduid, 632 }, 633 { 634 .procname = "overflowgid", 635 .data = &overflowgid, 636 .maxlen = sizeof(int), 637 .mode = 0644, 638 .proc_handler = proc_dointvec_minmax, 639 .extra1 = &minolduid, 640 .extra2 = &maxolduid, 641 }, 642 #ifdef CONFIG_S390 643 #ifdef CONFIG_MATHEMU 644 { 645 .procname = "ieee_emulation_warnings", 646 .data = &sysctl_ieee_emulation_warnings, 647 .maxlen = sizeof(int), 648 .mode = 0644, 649 .proc_handler = proc_dointvec, 650 }, 651 #endif 652 { 653 .procname = "userprocess_debug", 654 .data = &show_unhandled_signals, 655 .maxlen = sizeof(int), 656 .mode = 0644, 657 .proc_handler = proc_dointvec, 658 }, 659 #endif 660 { 661 .procname = "pid_max", 662 .data = &pid_max, 663 .maxlen = sizeof (int), 664 .mode = 0644, 665 .proc_handler = proc_dointvec_minmax, 666 .extra1 = &pid_max_min, 667 .extra2 = &pid_max_max, 668 }, 669 { 670 .procname = "panic_on_oops", 671 .data = &panic_on_oops, 672 .maxlen = sizeof(int), 673 .mode = 0644, 674 .proc_handler = proc_dointvec, 675 }, 676 #if defined CONFIG_PRINTK 677 { 678 .procname = "printk", 679 .data = &console_loglevel, 680 .maxlen = 4*sizeof(int), 681 .mode = 0644, 682 .proc_handler = proc_dointvec, 683 }, 684 { 685 .procname = "printk_ratelimit", 686 .data = &printk_ratelimit_state.interval, 687 .maxlen = sizeof(int), 688 .mode = 0644, 689 .proc_handler = proc_dointvec_jiffies, 690 }, 691 { 692 .procname = "printk_ratelimit_burst", 693 .data = &printk_ratelimit_state.burst, 694 .maxlen = sizeof(int), 695 .mode = 0644, 696 .proc_handler = proc_dointvec, 697 }, 698 { 699 .procname = "printk_delay", 700 .data = &printk_delay_msec, 701 .maxlen = sizeof(int), 702 .mode = 0644, 703 .proc_handler = proc_dointvec_minmax, 704 .extra1 = &zero, 705 .extra2 = &ten_thousand, 706 }, 707 { 708 .procname = "dmesg_restrict", 709 .data = &dmesg_restrict, 710 .maxlen = sizeof(int), 711 .mode = 0644, 712 .proc_handler = proc_dointvec_minmax, 713 .extra1 = &zero, 714 .extra2 = &one, 715 }, 716 { 717 .procname = "kptr_restrict", 718 .data = &kptr_restrict, 719 .maxlen = sizeof(int), 720 .mode = 0644, 721 .proc_handler = proc_dmesg_restrict, 722 .extra1 = &zero, 723 .extra2 = &two, 724 }, 725 #endif 726 { 727 .procname = "ngroups_max", 728 .data = &ngroups_max, 729 .maxlen = sizeof (int), 730 .mode = 0444, 731 .proc_handler = proc_dointvec, 732 }, 733 #if defined(CONFIG_LOCKUP_DETECTOR) 734 { 735 .procname = "watchdog", 736 .data = &watchdog_enabled, 737 .maxlen = sizeof (int), 738 .mode = 0644, 739 .proc_handler = proc_dowatchdog, 740 .extra1 = &zero, 741 .extra2 = &one, 742 }, 743 { 744 .procname = "watchdog_thresh", 745 .data = &watchdog_thresh, 746 .maxlen = sizeof(int), 747 .mode = 0644, 748 .proc_handler = proc_dowatchdog, 749 .extra1 = &neg_one, 750 .extra2 = &sixty, 751 }, 752 { 753 .procname = "softlockup_panic", 754 .data = &softlockup_panic, 755 .maxlen = sizeof(int), 756 .mode = 0644, 757 .proc_handler = proc_dointvec_minmax, 758 .extra1 = &zero, 759 .extra2 = &one, 760 }, 761 { 762 .procname = "nmi_watchdog", 763 .data = &watchdog_enabled, 764 .maxlen = sizeof (int), 765 .mode = 0644, 766 .proc_handler = proc_dowatchdog, 767 .extra1 = &zero, 768 .extra2 = &one, 769 }, 770 #endif 771 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 772 { 773 .procname = "unknown_nmi_panic", 774 .data = &unknown_nmi_panic, 775 .maxlen = sizeof (int), 776 .mode = 0644, 777 .proc_handler = proc_dointvec, 778 }, 779 #endif 780 #if defined(CONFIG_X86) 781 { 782 .procname = "panic_on_unrecovered_nmi", 783 .data = &panic_on_unrecovered_nmi, 784 .maxlen = sizeof(int), 785 .mode = 0644, 786 .proc_handler = proc_dointvec, 787 }, 788 { 789 .procname = "panic_on_io_nmi", 790 .data = &panic_on_io_nmi, 791 .maxlen = sizeof(int), 792 .mode = 0644, 793 .proc_handler = proc_dointvec, 794 }, 795 { 796 .procname = "bootloader_type", 797 .data = &bootloader_type, 798 .maxlen = sizeof (int), 799 .mode = 0444, 800 .proc_handler = proc_dointvec, 801 }, 802 { 803 .procname = "bootloader_version", 804 .data = &bootloader_version, 805 .maxlen = sizeof (int), 806 .mode = 0444, 807 .proc_handler = proc_dointvec, 808 }, 809 { 810 .procname = "kstack_depth_to_print", 811 .data = &kstack_depth_to_print, 812 .maxlen = sizeof(int), 813 .mode = 0644, 814 .proc_handler = proc_dointvec, 815 }, 816 { 817 .procname = "io_delay_type", 818 .data = &io_delay_type, 819 .maxlen = sizeof(int), 820 .mode = 0644, 821 .proc_handler = proc_dointvec, 822 }, 823 #endif 824 #if defined(CONFIG_MMU) 825 { 826 .procname = "randomize_va_space", 827 .data = &randomize_va_space, 828 .maxlen = sizeof(int), 829 .mode = 0644, 830 .proc_handler = proc_dointvec, 831 }, 832 #endif 833 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 834 { 835 .procname = "spin_retry", 836 .data = &spin_retry, 837 .maxlen = sizeof (int), 838 .mode = 0644, 839 .proc_handler = proc_dointvec, 840 }, 841 #endif 842 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 843 { 844 .procname = "acpi_video_flags", 845 .data = &acpi_realmode_flags, 846 .maxlen = sizeof (unsigned long), 847 .mode = 0644, 848 .proc_handler = proc_doulongvec_minmax, 849 }, 850 #endif 851 #ifdef CONFIG_IA64 852 { 853 .procname = "ignore-unaligned-usertrap", 854 .data = &no_unaligned_warning, 855 .maxlen = sizeof (int), 856 .mode = 0644, 857 .proc_handler = proc_dointvec, 858 }, 859 { 860 .procname = "unaligned-dump-stack", 861 .data = &unaligned_dump_stack, 862 .maxlen = sizeof (int), 863 .mode = 0644, 864 .proc_handler = proc_dointvec, 865 }, 866 #endif 867 #ifdef CONFIG_DETECT_HUNG_TASK 868 { 869 .procname = "hung_task_panic", 870 .data = &sysctl_hung_task_panic, 871 .maxlen = sizeof(int), 872 .mode = 0644, 873 .proc_handler = proc_dointvec_minmax, 874 .extra1 = &zero, 875 .extra2 = &one, 876 }, 877 { 878 .procname = "hung_task_check_count", 879 .data = &sysctl_hung_task_check_count, 880 .maxlen = sizeof(unsigned long), 881 .mode = 0644, 882 .proc_handler = proc_doulongvec_minmax, 883 }, 884 { 885 .procname = "hung_task_timeout_secs", 886 .data = &sysctl_hung_task_timeout_secs, 887 .maxlen = sizeof(unsigned long), 888 .mode = 0644, 889 .proc_handler = proc_dohung_task_timeout_secs, 890 }, 891 { 892 .procname = "hung_task_warnings", 893 .data = &sysctl_hung_task_warnings, 894 .maxlen = sizeof(unsigned long), 895 .mode = 0644, 896 .proc_handler = proc_doulongvec_minmax, 897 }, 898 #endif 899 #ifdef CONFIG_COMPAT 900 { 901 .procname = "compat-log", 902 .data = &compat_log, 903 .maxlen = sizeof (int), 904 .mode = 0644, 905 .proc_handler = proc_dointvec, 906 }, 907 #endif 908 #ifdef CONFIG_RT_MUTEXES 909 { 910 .procname = "max_lock_depth", 911 .data = &max_lock_depth, 912 .maxlen = sizeof(int), 913 .mode = 0644, 914 .proc_handler = proc_dointvec, 915 }, 916 #endif 917 { 918 .procname = "poweroff_cmd", 919 .data = &poweroff_cmd, 920 .maxlen = POWEROFF_CMD_PATH_LEN, 921 .mode = 0644, 922 .proc_handler = proc_dostring, 923 }, 924 #ifdef CONFIG_KEYS 925 { 926 .procname = "keys", 927 .mode = 0555, 928 .child = key_sysctls, 929 }, 930 #endif 931 #ifdef CONFIG_RCU_TORTURE_TEST 932 { 933 .procname = "rcutorture_runnable", 934 .data = &rcutorture_runnable, 935 .maxlen = sizeof(int), 936 .mode = 0644, 937 .proc_handler = proc_dointvec, 938 }, 939 #endif 940 #ifdef CONFIG_PERF_EVENTS 941 /* 942 * User-space scripts rely on the existence of this file 943 * as a feature check for perf_events being enabled. 944 * 945 * So it's an ABI, do not remove! 946 */ 947 { 948 .procname = "perf_event_paranoid", 949 .data = &sysctl_perf_event_paranoid, 950 .maxlen = sizeof(sysctl_perf_event_paranoid), 951 .mode = 0644, 952 .proc_handler = proc_dointvec, 953 }, 954 { 955 .procname = "perf_event_mlock_kb", 956 .data = &sysctl_perf_event_mlock, 957 .maxlen = sizeof(sysctl_perf_event_mlock), 958 .mode = 0644, 959 .proc_handler = proc_dointvec, 960 }, 961 { 962 .procname = "perf_event_max_sample_rate", 963 .data = &sysctl_perf_event_sample_rate, 964 .maxlen = sizeof(sysctl_perf_event_sample_rate), 965 .mode = 0644, 966 .proc_handler = perf_proc_update_handler, 967 }, 968 #endif 969 #ifdef CONFIG_KMEMCHECK 970 { 971 .procname = "kmemcheck", 972 .data = &kmemcheck_enabled, 973 .maxlen = sizeof(int), 974 .mode = 0644, 975 .proc_handler = proc_dointvec, 976 }, 977 #endif 978 #ifdef CONFIG_BLOCK 979 { 980 .procname = "blk_iopoll", 981 .data = &blk_iopoll_enabled, 982 .maxlen = sizeof(int), 983 .mode = 0644, 984 .proc_handler = proc_dointvec, 985 }, 986 #endif 987 { } 988 }; 989 990 static struct ctl_table vm_table[] = { 991 { 992 .procname = "overcommit_memory", 993 .data = &sysctl_overcommit_memory, 994 .maxlen = sizeof(sysctl_overcommit_memory), 995 .mode = 0644, 996 .proc_handler = proc_dointvec_minmax, 997 .extra1 = &zero, 998 .extra2 = &two, 999 }, 1000 { 1001 .procname = "panic_on_oom", 1002 .data = &sysctl_panic_on_oom, 1003 .maxlen = sizeof(sysctl_panic_on_oom), 1004 .mode = 0644, 1005 .proc_handler = proc_dointvec_minmax, 1006 .extra1 = &zero, 1007 .extra2 = &two, 1008 }, 1009 { 1010 .procname = "oom_kill_allocating_task", 1011 .data = &sysctl_oom_kill_allocating_task, 1012 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1013 .mode = 0644, 1014 .proc_handler = proc_dointvec, 1015 }, 1016 { 1017 .procname = "oom_dump_tasks", 1018 .data = &sysctl_oom_dump_tasks, 1019 .maxlen = sizeof(sysctl_oom_dump_tasks), 1020 .mode = 0644, 1021 .proc_handler = proc_dointvec, 1022 }, 1023 { 1024 .procname = "overcommit_ratio", 1025 .data = &sysctl_overcommit_ratio, 1026 .maxlen = sizeof(sysctl_overcommit_ratio), 1027 .mode = 0644, 1028 .proc_handler = proc_dointvec, 1029 }, 1030 { 1031 .procname = "page-cluster", 1032 .data = &page_cluster, 1033 .maxlen = sizeof(int), 1034 .mode = 0644, 1035 .proc_handler = proc_dointvec_minmax, 1036 .extra1 = &zero, 1037 }, 1038 { 1039 .procname = "dirty_background_ratio", 1040 .data = &dirty_background_ratio, 1041 .maxlen = sizeof(dirty_background_ratio), 1042 .mode = 0644, 1043 .proc_handler = dirty_background_ratio_handler, 1044 .extra1 = &zero, 1045 .extra2 = &one_hundred, 1046 }, 1047 { 1048 .procname = "dirty_background_bytes", 1049 .data = &dirty_background_bytes, 1050 .maxlen = sizeof(dirty_background_bytes), 1051 .mode = 0644, 1052 .proc_handler = dirty_background_bytes_handler, 1053 .extra1 = &one_ul, 1054 }, 1055 { 1056 .procname = "dirty_ratio", 1057 .data = &vm_dirty_ratio, 1058 .maxlen = sizeof(vm_dirty_ratio), 1059 .mode = 0644, 1060 .proc_handler = dirty_ratio_handler, 1061 .extra1 = &zero, 1062 .extra2 = &one_hundred, 1063 }, 1064 { 1065 .procname = "dirty_bytes", 1066 .data = &vm_dirty_bytes, 1067 .maxlen = sizeof(vm_dirty_bytes), 1068 .mode = 0644, 1069 .proc_handler = dirty_bytes_handler, 1070 .extra1 = &dirty_bytes_min, 1071 }, 1072 { 1073 .procname = "dirty_writeback_centisecs", 1074 .data = &dirty_writeback_interval, 1075 .maxlen = sizeof(dirty_writeback_interval), 1076 .mode = 0644, 1077 .proc_handler = dirty_writeback_centisecs_handler, 1078 }, 1079 { 1080 .procname = "dirty_expire_centisecs", 1081 .data = &dirty_expire_interval, 1082 .maxlen = sizeof(dirty_expire_interval), 1083 .mode = 0644, 1084 .proc_handler = proc_dointvec_minmax, 1085 .extra1 = &zero, 1086 }, 1087 { 1088 .procname = "nr_pdflush_threads", 1089 .data = &nr_pdflush_threads, 1090 .maxlen = sizeof nr_pdflush_threads, 1091 .mode = 0444 /* read-only*/, 1092 .proc_handler = proc_dointvec, 1093 }, 1094 { 1095 .procname = "swappiness", 1096 .data = &vm_swappiness, 1097 .maxlen = sizeof(vm_swappiness), 1098 .mode = 0644, 1099 .proc_handler = proc_dointvec_minmax, 1100 .extra1 = &zero, 1101 .extra2 = &one_hundred, 1102 }, 1103 #ifdef CONFIG_HUGETLB_PAGE 1104 { 1105 .procname = "nr_hugepages", 1106 .data = NULL, 1107 .maxlen = sizeof(unsigned long), 1108 .mode = 0644, 1109 .proc_handler = hugetlb_sysctl_handler, 1110 .extra1 = (void *)&hugetlb_zero, 1111 .extra2 = (void *)&hugetlb_infinity, 1112 }, 1113 #ifdef CONFIG_NUMA 1114 { 1115 .procname = "nr_hugepages_mempolicy", 1116 .data = NULL, 1117 .maxlen = sizeof(unsigned long), 1118 .mode = 0644, 1119 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1120 .extra1 = (void *)&hugetlb_zero, 1121 .extra2 = (void *)&hugetlb_infinity, 1122 }, 1123 #endif 1124 { 1125 .procname = "hugetlb_shm_group", 1126 .data = &sysctl_hugetlb_shm_group, 1127 .maxlen = sizeof(gid_t), 1128 .mode = 0644, 1129 .proc_handler = proc_dointvec, 1130 }, 1131 { 1132 .procname = "hugepages_treat_as_movable", 1133 .data = &hugepages_treat_as_movable, 1134 .maxlen = sizeof(int), 1135 .mode = 0644, 1136 .proc_handler = hugetlb_treat_movable_handler, 1137 }, 1138 { 1139 .procname = "nr_overcommit_hugepages", 1140 .data = NULL, 1141 .maxlen = sizeof(unsigned long), 1142 .mode = 0644, 1143 .proc_handler = hugetlb_overcommit_handler, 1144 .extra1 = (void *)&hugetlb_zero, 1145 .extra2 = (void *)&hugetlb_infinity, 1146 }, 1147 #endif 1148 { 1149 .procname = "lowmem_reserve_ratio", 1150 .data = &sysctl_lowmem_reserve_ratio, 1151 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1152 .mode = 0644, 1153 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1154 }, 1155 { 1156 .procname = "drop_caches", 1157 .data = &sysctl_drop_caches, 1158 .maxlen = sizeof(int), 1159 .mode = 0644, 1160 .proc_handler = drop_caches_sysctl_handler, 1161 .extra1 = &one, 1162 .extra2 = &three, 1163 }, 1164 #ifdef CONFIG_COMPACTION 1165 { 1166 .procname = "compact_memory", 1167 .data = &sysctl_compact_memory, 1168 .maxlen = sizeof(int), 1169 .mode = 0200, 1170 .proc_handler = sysctl_compaction_handler, 1171 }, 1172 { 1173 .procname = "extfrag_threshold", 1174 .data = &sysctl_extfrag_threshold, 1175 .maxlen = sizeof(int), 1176 .mode = 0644, 1177 .proc_handler = sysctl_extfrag_handler, 1178 .extra1 = &min_extfrag_threshold, 1179 .extra2 = &max_extfrag_threshold, 1180 }, 1181 1182 #endif /* CONFIG_COMPACTION */ 1183 { 1184 .procname = "min_free_kbytes", 1185 .data = &min_free_kbytes, 1186 .maxlen = sizeof(min_free_kbytes), 1187 .mode = 0644, 1188 .proc_handler = min_free_kbytes_sysctl_handler, 1189 .extra1 = &zero, 1190 }, 1191 { 1192 .procname = "percpu_pagelist_fraction", 1193 .data = &percpu_pagelist_fraction, 1194 .maxlen = sizeof(percpu_pagelist_fraction), 1195 .mode = 0644, 1196 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1197 .extra1 = &min_percpu_pagelist_fract, 1198 }, 1199 #ifdef CONFIG_MMU 1200 { 1201 .procname = "max_map_count", 1202 .data = &sysctl_max_map_count, 1203 .maxlen = sizeof(sysctl_max_map_count), 1204 .mode = 0644, 1205 .proc_handler = proc_dointvec_minmax, 1206 .extra1 = &zero, 1207 }, 1208 #else 1209 { 1210 .procname = "nr_trim_pages", 1211 .data = &sysctl_nr_trim_pages, 1212 .maxlen = sizeof(sysctl_nr_trim_pages), 1213 .mode = 0644, 1214 .proc_handler = proc_dointvec_minmax, 1215 .extra1 = &zero, 1216 }, 1217 #endif 1218 { 1219 .procname = "laptop_mode", 1220 .data = &laptop_mode, 1221 .maxlen = sizeof(laptop_mode), 1222 .mode = 0644, 1223 .proc_handler = proc_dointvec_jiffies, 1224 }, 1225 { 1226 .procname = "block_dump", 1227 .data = &block_dump, 1228 .maxlen = sizeof(block_dump), 1229 .mode = 0644, 1230 .proc_handler = proc_dointvec, 1231 .extra1 = &zero, 1232 }, 1233 { 1234 .procname = "vfs_cache_pressure", 1235 .data = &sysctl_vfs_cache_pressure, 1236 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1237 .mode = 0644, 1238 .proc_handler = proc_dointvec, 1239 .extra1 = &zero, 1240 }, 1241 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1242 { 1243 .procname = "legacy_va_layout", 1244 .data = &sysctl_legacy_va_layout, 1245 .maxlen = sizeof(sysctl_legacy_va_layout), 1246 .mode = 0644, 1247 .proc_handler = proc_dointvec, 1248 .extra1 = &zero, 1249 }, 1250 #endif 1251 #ifdef CONFIG_NUMA 1252 { 1253 .procname = "zone_reclaim_mode", 1254 .data = &zone_reclaim_mode, 1255 .maxlen = sizeof(zone_reclaim_mode), 1256 .mode = 0644, 1257 .proc_handler = proc_dointvec, 1258 .extra1 = &zero, 1259 }, 1260 { 1261 .procname = "min_unmapped_ratio", 1262 .data = &sysctl_min_unmapped_ratio, 1263 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1264 .mode = 0644, 1265 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1266 .extra1 = &zero, 1267 .extra2 = &one_hundred, 1268 }, 1269 { 1270 .procname = "min_slab_ratio", 1271 .data = &sysctl_min_slab_ratio, 1272 .maxlen = sizeof(sysctl_min_slab_ratio), 1273 .mode = 0644, 1274 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1275 .extra1 = &zero, 1276 .extra2 = &one_hundred, 1277 }, 1278 #endif 1279 #ifdef CONFIG_SMP 1280 { 1281 .procname = "stat_interval", 1282 .data = &sysctl_stat_interval, 1283 .maxlen = sizeof(sysctl_stat_interval), 1284 .mode = 0644, 1285 .proc_handler = proc_dointvec_jiffies, 1286 }, 1287 #endif 1288 #ifdef CONFIG_MMU 1289 { 1290 .procname = "mmap_min_addr", 1291 .data = &dac_mmap_min_addr, 1292 .maxlen = sizeof(unsigned long), 1293 .mode = 0644, 1294 .proc_handler = mmap_min_addr_handler, 1295 }, 1296 #endif 1297 #ifdef CONFIG_NUMA 1298 { 1299 .procname = "numa_zonelist_order", 1300 .data = &numa_zonelist_order, 1301 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1302 .mode = 0644, 1303 .proc_handler = numa_zonelist_order_handler, 1304 }, 1305 #endif 1306 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1307 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1308 { 1309 .procname = "vdso_enabled", 1310 .data = &vdso_enabled, 1311 .maxlen = sizeof(vdso_enabled), 1312 .mode = 0644, 1313 .proc_handler = proc_dointvec, 1314 .extra1 = &zero, 1315 }, 1316 #endif 1317 #ifdef CONFIG_HIGHMEM 1318 { 1319 .procname = "highmem_is_dirtyable", 1320 .data = &vm_highmem_is_dirtyable, 1321 .maxlen = sizeof(vm_highmem_is_dirtyable), 1322 .mode = 0644, 1323 .proc_handler = proc_dointvec_minmax, 1324 .extra1 = &zero, 1325 .extra2 = &one, 1326 }, 1327 #endif 1328 { 1329 .procname = "scan_unevictable_pages", 1330 .data = &scan_unevictable_pages, 1331 .maxlen = sizeof(scan_unevictable_pages), 1332 .mode = 0644, 1333 .proc_handler = scan_unevictable_handler, 1334 }, 1335 #ifdef CONFIG_MEMORY_FAILURE 1336 { 1337 .procname = "memory_failure_early_kill", 1338 .data = &sysctl_memory_failure_early_kill, 1339 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1340 .mode = 0644, 1341 .proc_handler = proc_dointvec_minmax, 1342 .extra1 = &zero, 1343 .extra2 = &one, 1344 }, 1345 { 1346 .procname = "memory_failure_recovery", 1347 .data = &sysctl_memory_failure_recovery, 1348 .maxlen = sizeof(sysctl_memory_failure_recovery), 1349 .mode = 0644, 1350 .proc_handler = proc_dointvec_minmax, 1351 .extra1 = &zero, 1352 .extra2 = &one, 1353 }, 1354 #endif 1355 { } 1356 }; 1357 1358 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1359 static struct ctl_table binfmt_misc_table[] = { 1360 { } 1361 }; 1362 #endif 1363 1364 static struct ctl_table fs_table[] = { 1365 { 1366 .procname = "inode-nr", 1367 .data = &inodes_stat, 1368 .maxlen = 2*sizeof(int), 1369 .mode = 0444, 1370 .proc_handler = proc_nr_inodes, 1371 }, 1372 { 1373 .procname = "inode-state", 1374 .data = &inodes_stat, 1375 .maxlen = 7*sizeof(int), 1376 .mode = 0444, 1377 .proc_handler = proc_nr_inodes, 1378 }, 1379 { 1380 .procname = "file-nr", 1381 .data = &files_stat, 1382 .maxlen = sizeof(files_stat), 1383 .mode = 0444, 1384 .proc_handler = proc_nr_files, 1385 }, 1386 { 1387 .procname = "file-max", 1388 .data = &files_stat.max_files, 1389 .maxlen = sizeof(files_stat.max_files), 1390 .mode = 0644, 1391 .proc_handler = proc_doulongvec_minmax, 1392 }, 1393 { 1394 .procname = "nr_open", 1395 .data = &sysctl_nr_open, 1396 .maxlen = sizeof(int), 1397 .mode = 0644, 1398 .proc_handler = proc_dointvec_minmax, 1399 .extra1 = &sysctl_nr_open_min, 1400 .extra2 = &sysctl_nr_open_max, 1401 }, 1402 { 1403 .procname = "dentry-state", 1404 .data = &dentry_stat, 1405 .maxlen = 6*sizeof(int), 1406 .mode = 0444, 1407 .proc_handler = proc_nr_dentry, 1408 }, 1409 { 1410 .procname = "overflowuid", 1411 .data = &fs_overflowuid, 1412 .maxlen = sizeof(int), 1413 .mode = 0644, 1414 .proc_handler = proc_dointvec_minmax, 1415 .extra1 = &minolduid, 1416 .extra2 = &maxolduid, 1417 }, 1418 { 1419 .procname = "overflowgid", 1420 .data = &fs_overflowgid, 1421 .maxlen = sizeof(int), 1422 .mode = 0644, 1423 .proc_handler = proc_dointvec_minmax, 1424 .extra1 = &minolduid, 1425 .extra2 = &maxolduid, 1426 }, 1427 #ifdef CONFIG_FILE_LOCKING 1428 { 1429 .procname = "leases-enable", 1430 .data = &leases_enable, 1431 .maxlen = sizeof(int), 1432 .mode = 0644, 1433 .proc_handler = proc_dointvec, 1434 }, 1435 #endif 1436 #ifdef CONFIG_DNOTIFY 1437 { 1438 .procname = "dir-notify-enable", 1439 .data = &dir_notify_enable, 1440 .maxlen = sizeof(int), 1441 .mode = 0644, 1442 .proc_handler = proc_dointvec, 1443 }, 1444 #endif 1445 #ifdef CONFIG_MMU 1446 #ifdef CONFIG_FILE_LOCKING 1447 { 1448 .procname = "lease-break-time", 1449 .data = &lease_break_time, 1450 .maxlen = sizeof(int), 1451 .mode = 0644, 1452 .proc_handler = proc_dointvec, 1453 }, 1454 #endif 1455 #ifdef CONFIG_AIO 1456 { 1457 .procname = "aio-nr", 1458 .data = &aio_nr, 1459 .maxlen = sizeof(aio_nr), 1460 .mode = 0444, 1461 .proc_handler = proc_doulongvec_minmax, 1462 }, 1463 { 1464 .procname = "aio-max-nr", 1465 .data = &aio_max_nr, 1466 .maxlen = sizeof(aio_max_nr), 1467 .mode = 0644, 1468 .proc_handler = proc_doulongvec_minmax, 1469 }, 1470 #endif /* CONFIG_AIO */ 1471 #ifdef CONFIG_INOTIFY_USER 1472 { 1473 .procname = "inotify", 1474 .mode = 0555, 1475 .child = inotify_table, 1476 }, 1477 #endif 1478 #ifdef CONFIG_EPOLL 1479 { 1480 .procname = "epoll", 1481 .mode = 0555, 1482 .child = epoll_table, 1483 }, 1484 #endif 1485 #endif 1486 { 1487 .procname = "suid_dumpable", 1488 .data = &suid_dumpable, 1489 .maxlen = sizeof(int), 1490 .mode = 0644, 1491 .proc_handler = proc_dointvec_minmax, 1492 .extra1 = &zero, 1493 .extra2 = &two, 1494 }, 1495 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1496 { 1497 .procname = "binfmt_misc", 1498 .mode = 0555, 1499 .child = binfmt_misc_table, 1500 }, 1501 #endif 1502 { 1503 .procname = "pipe-max-size", 1504 .data = &pipe_max_size, 1505 .maxlen = sizeof(int), 1506 .mode = 0644, 1507 .proc_handler = &pipe_proc_fn, 1508 .extra1 = &pipe_min_size, 1509 }, 1510 { } 1511 }; 1512 1513 static struct ctl_table debug_table[] = { 1514 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1515 defined(CONFIG_S390) || defined(CONFIG_TILE) 1516 { 1517 .procname = "exception-trace", 1518 .data = &show_unhandled_signals, 1519 .maxlen = sizeof(int), 1520 .mode = 0644, 1521 .proc_handler = proc_dointvec 1522 }, 1523 #endif 1524 #if defined(CONFIG_OPTPROBES) 1525 { 1526 .procname = "kprobes-optimization", 1527 .data = &sysctl_kprobes_optimization, 1528 .maxlen = sizeof(int), 1529 .mode = 0644, 1530 .proc_handler = proc_kprobes_optimization_handler, 1531 .extra1 = &zero, 1532 .extra2 = &one, 1533 }, 1534 #endif 1535 { } 1536 }; 1537 1538 static struct ctl_table dev_table[] = { 1539 { } 1540 }; 1541 1542 static DEFINE_SPINLOCK(sysctl_lock); 1543 1544 /* called under sysctl_lock */ 1545 static int use_table(struct ctl_table_header *p) 1546 { 1547 if (unlikely(p->unregistering)) 1548 return 0; 1549 p->used++; 1550 return 1; 1551 } 1552 1553 /* called under sysctl_lock */ 1554 static void unuse_table(struct ctl_table_header *p) 1555 { 1556 if (!--p->used) 1557 if (unlikely(p->unregistering)) 1558 complete(p->unregistering); 1559 } 1560 1561 /* called under sysctl_lock, will reacquire if has to wait */ 1562 static void start_unregistering(struct ctl_table_header *p) 1563 { 1564 /* 1565 * if p->used is 0, nobody will ever touch that entry again; 1566 * we'll eliminate all paths to it before dropping sysctl_lock 1567 */ 1568 if (unlikely(p->used)) { 1569 struct completion wait; 1570 init_completion(&wait); 1571 p->unregistering = &wait; 1572 spin_unlock(&sysctl_lock); 1573 wait_for_completion(&wait); 1574 spin_lock(&sysctl_lock); 1575 } else { 1576 /* anything non-NULL; we'll never dereference it */ 1577 p->unregistering = ERR_PTR(-EINVAL); 1578 } 1579 /* 1580 * do not remove from the list until nobody holds it; walking the 1581 * list in do_sysctl() relies on that. 1582 */ 1583 list_del_init(&p->ctl_entry); 1584 } 1585 1586 void sysctl_head_get(struct ctl_table_header *head) 1587 { 1588 spin_lock(&sysctl_lock); 1589 head->count++; 1590 spin_unlock(&sysctl_lock); 1591 } 1592 1593 void sysctl_head_put(struct ctl_table_header *head) 1594 { 1595 spin_lock(&sysctl_lock); 1596 if (!--head->count) 1597 kfree_rcu(head, rcu); 1598 spin_unlock(&sysctl_lock); 1599 } 1600 1601 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1602 { 1603 if (!head) 1604 BUG(); 1605 spin_lock(&sysctl_lock); 1606 if (!use_table(head)) 1607 head = ERR_PTR(-ENOENT); 1608 spin_unlock(&sysctl_lock); 1609 return head; 1610 } 1611 1612 void sysctl_head_finish(struct ctl_table_header *head) 1613 { 1614 if (!head) 1615 return; 1616 spin_lock(&sysctl_lock); 1617 unuse_table(head); 1618 spin_unlock(&sysctl_lock); 1619 } 1620 1621 static struct ctl_table_set * 1622 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1623 { 1624 struct ctl_table_set *set = &root->default_set; 1625 if (root->lookup) 1626 set = root->lookup(root, namespaces); 1627 return set; 1628 } 1629 1630 static struct list_head * 1631 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1632 { 1633 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1634 return &set->list; 1635 } 1636 1637 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1638 struct ctl_table_header *prev) 1639 { 1640 struct ctl_table_root *root; 1641 struct list_head *header_list; 1642 struct ctl_table_header *head; 1643 struct list_head *tmp; 1644 1645 spin_lock(&sysctl_lock); 1646 if (prev) { 1647 head = prev; 1648 tmp = &prev->ctl_entry; 1649 unuse_table(prev); 1650 goto next; 1651 } 1652 tmp = &root_table_header.ctl_entry; 1653 for (;;) { 1654 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1655 1656 if (!use_table(head)) 1657 goto next; 1658 spin_unlock(&sysctl_lock); 1659 return head; 1660 next: 1661 root = head->root; 1662 tmp = tmp->next; 1663 header_list = lookup_header_list(root, namespaces); 1664 if (tmp != header_list) 1665 continue; 1666 1667 do { 1668 root = list_entry(root->root_list.next, 1669 struct ctl_table_root, root_list); 1670 if (root == &sysctl_table_root) 1671 goto out; 1672 header_list = lookup_header_list(root, namespaces); 1673 } while (list_empty(header_list)); 1674 tmp = header_list->next; 1675 } 1676 out: 1677 spin_unlock(&sysctl_lock); 1678 return NULL; 1679 } 1680 1681 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1682 { 1683 return __sysctl_head_next(current->nsproxy, prev); 1684 } 1685 1686 void register_sysctl_root(struct ctl_table_root *root) 1687 { 1688 spin_lock(&sysctl_lock); 1689 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1690 spin_unlock(&sysctl_lock); 1691 } 1692 1693 /* 1694 * sysctl_perm does NOT grant the superuser all rights automatically, because 1695 * some sysctl variables are readonly even to root. 1696 */ 1697 1698 static int test_perm(int mode, int op) 1699 { 1700 if (!current_euid()) 1701 mode >>= 6; 1702 else if (in_egroup_p(0)) 1703 mode >>= 3; 1704 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1705 return 0; 1706 return -EACCES; 1707 } 1708 1709 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1710 { 1711 int mode; 1712 1713 if (root->permissions) 1714 mode = root->permissions(root, current->nsproxy, table); 1715 else 1716 mode = table->mode; 1717 1718 return test_perm(mode, op); 1719 } 1720 1721 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1722 { 1723 for (; table->procname; table++) { 1724 table->parent = parent; 1725 if (table->child) 1726 sysctl_set_parent(table, table->child); 1727 } 1728 } 1729 1730 static __init int sysctl_init(void) 1731 { 1732 sysctl_set_parent(NULL, root_table); 1733 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1734 sysctl_check_table(current->nsproxy, root_table); 1735 #endif 1736 return 0; 1737 } 1738 1739 core_initcall(sysctl_init); 1740 1741 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1742 struct ctl_table *table) 1743 { 1744 struct ctl_table *p; 1745 const char *s = branch->procname; 1746 1747 /* branch should have named subdirectory as its first element */ 1748 if (!s || !branch->child) 1749 return NULL; 1750 1751 /* ... and nothing else */ 1752 if (branch[1].procname) 1753 return NULL; 1754 1755 /* table should contain subdirectory with the same name */ 1756 for (p = table; p->procname; p++) { 1757 if (!p->child) 1758 continue; 1759 if (p->procname && strcmp(p->procname, s) == 0) 1760 return p; 1761 } 1762 return NULL; 1763 } 1764 1765 /* see if attaching q to p would be an improvement */ 1766 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1767 { 1768 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1769 struct ctl_table *next; 1770 int is_better = 0; 1771 int not_in_parent = !p->attached_by; 1772 1773 while ((next = is_branch_in(by, to)) != NULL) { 1774 if (by == q->attached_by) 1775 is_better = 1; 1776 if (to == p->attached_by) 1777 not_in_parent = 1; 1778 by = by->child; 1779 to = next->child; 1780 } 1781 1782 if (is_better && not_in_parent) { 1783 q->attached_by = by; 1784 q->attached_to = to; 1785 q->parent = p; 1786 } 1787 } 1788 1789 /** 1790 * __register_sysctl_paths - register a sysctl hierarchy 1791 * @root: List of sysctl headers to register on 1792 * @namespaces: Data to compute which lists of sysctl entries are visible 1793 * @path: The path to the directory the sysctl table is in. 1794 * @table: the top-level table structure 1795 * 1796 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1797 * array. A completely 0 filled entry terminates the table. 1798 * 1799 * The members of the &struct ctl_table structure are used as follows: 1800 * 1801 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1802 * enter a sysctl file 1803 * 1804 * data - a pointer to data for use by proc_handler 1805 * 1806 * maxlen - the maximum size in bytes of the data 1807 * 1808 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1809 * 1810 * child - a pointer to the child sysctl table if this entry is a directory, or 1811 * %NULL. 1812 * 1813 * proc_handler - the text handler routine (described below) 1814 * 1815 * de - for internal use by the sysctl routines 1816 * 1817 * extra1, extra2 - extra pointers usable by the proc handler routines 1818 * 1819 * Leaf nodes in the sysctl tree will be represented by a single file 1820 * under /proc; non-leaf nodes will be represented by directories. 1821 * 1822 * sysctl(2) can automatically manage read and write requests through 1823 * the sysctl table. The data and maxlen fields of the ctl_table 1824 * struct enable minimal validation of the values being written to be 1825 * performed, and the mode field allows minimal authentication. 1826 * 1827 * There must be a proc_handler routine for any terminal nodes 1828 * mirrored under /proc/sys (non-terminals are handled by a built-in 1829 * directory handler). Several default handlers are available to 1830 * cover common cases - 1831 * 1832 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1833 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1834 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1835 * 1836 * It is the handler's job to read the input buffer from user memory 1837 * and process it. The handler should return 0 on success. 1838 * 1839 * This routine returns %NULL on a failure to register, and a pointer 1840 * to the table header on success. 1841 */ 1842 struct ctl_table_header *__register_sysctl_paths( 1843 struct ctl_table_root *root, 1844 struct nsproxy *namespaces, 1845 const struct ctl_path *path, struct ctl_table *table) 1846 { 1847 struct ctl_table_header *header; 1848 struct ctl_table *new, **prevp; 1849 unsigned int n, npath; 1850 struct ctl_table_set *set; 1851 1852 /* Count the path components */ 1853 for (npath = 0; path[npath].procname; ++npath) 1854 ; 1855 1856 /* 1857 * For each path component, allocate a 2-element ctl_table array. 1858 * The first array element will be filled with the sysctl entry 1859 * for this, the second will be the sentinel (procname == 0). 1860 * 1861 * We allocate everything in one go so that we don't have to 1862 * worry about freeing additional memory in unregister_sysctl_table. 1863 */ 1864 header = kzalloc(sizeof(struct ctl_table_header) + 1865 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1866 if (!header) 1867 return NULL; 1868 1869 new = (struct ctl_table *) (header + 1); 1870 1871 /* Now connect the dots */ 1872 prevp = &header->ctl_table; 1873 for (n = 0; n < npath; ++n, ++path) { 1874 /* Copy the procname */ 1875 new->procname = path->procname; 1876 new->mode = 0555; 1877 1878 *prevp = new; 1879 prevp = &new->child; 1880 1881 new += 2; 1882 } 1883 *prevp = table; 1884 header->ctl_table_arg = table; 1885 1886 INIT_LIST_HEAD(&header->ctl_entry); 1887 header->used = 0; 1888 header->unregistering = NULL; 1889 header->root = root; 1890 sysctl_set_parent(NULL, header->ctl_table); 1891 header->count = 1; 1892 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1893 if (sysctl_check_table(namespaces, header->ctl_table)) { 1894 kfree(header); 1895 return NULL; 1896 } 1897 #endif 1898 spin_lock(&sysctl_lock); 1899 header->set = lookup_header_set(root, namespaces); 1900 header->attached_by = header->ctl_table; 1901 header->attached_to = root_table; 1902 header->parent = &root_table_header; 1903 for (set = header->set; set; set = set->parent) { 1904 struct ctl_table_header *p; 1905 list_for_each_entry(p, &set->list, ctl_entry) { 1906 if (p->unregistering) 1907 continue; 1908 try_attach(p, header); 1909 } 1910 } 1911 header->parent->count++; 1912 list_add_tail(&header->ctl_entry, &header->set->list); 1913 spin_unlock(&sysctl_lock); 1914 1915 return header; 1916 } 1917 1918 /** 1919 * register_sysctl_table_path - register a sysctl table hierarchy 1920 * @path: The path to the directory the sysctl table is in. 1921 * @table: the top-level table structure 1922 * 1923 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1924 * array. A completely 0 filled entry terminates the table. 1925 * 1926 * See __register_sysctl_paths for more details. 1927 */ 1928 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1929 struct ctl_table *table) 1930 { 1931 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1932 path, table); 1933 } 1934 1935 /** 1936 * register_sysctl_table - register a sysctl table hierarchy 1937 * @table: the top-level table structure 1938 * 1939 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1940 * array. A completely 0 filled entry terminates the table. 1941 * 1942 * See register_sysctl_paths for more details. 1943 */ 1944 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1945 { 1946 static const struct ctl_path null_path[] = { {} }; 1947 1948 return register_sysctl_paths(null_path, table); 1949 } 1950 1951 /** 1952 * unregister_sysctl_table - unregister a sysctl table hierarchy 1953 * @header: the header returned from register_sysctl_table 1954 * 1955 * Unregisters the sysctl table and all children. proc entries may not 1956 * actually be removed until they are no longer used by anyone. 1957 */ 1958 void unregister_sysctl_table(struct ctl_table_header * header) 1959 { 1960 might_sleep(); 1961 1962 if (header == NULL) 1963 return; 1964 1965 spin_lock(&sysctl_lock); 1966 start_unregistering(header); 1967 if (!--header->parent->count) { 1968 WARN_ON(1); 1969 kfree_rcu(header->parent, rcu); 1970 } 1971 if (!--header->count) 1972 kfree_rcu(header, rcu); 1973 spin_unlock(&sysctl_lock); 1974 } 1975 1976 int sysctl_is_seen(struct ctl_table_header *p) 1977 { 1978 struct ctl_table_set *set = p->set; 1979 int res; 1980 spin_lock(&sysctl_lock); 1981 if (p->unregistering) 1982 res = 0; 1983 else if (!set->is_seen) 1984 res = 1; 1985 else 1986 res = set->is_seen(set); 1987 spin_unlock(&sysctl_lock); 1988 return res; 1989 } 1990 1991 void setup_sysctl_set(struct ctl_table_set *p, 1992 struct ctl_table_set *parent, 1993 int (*is_seen)(struct ctl_table_set *)) 1994 { 1995 INIT_LIST_HEAD(&p->list); 1996 p->parent = parent ? parent : &sysctl_table_root.default_set; 1997 p->is_seen = is_seen; 1998 } 1999 2000 #else /* !CONFIG_SYSCTL */ 2001 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2002 { 2003 return NULL; 2004 } 2005 2006 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2007 struct ctl_table *table) 2008 { 2009 return NULL; 2010 } 2011 2012 void unregister_sysctl_table(struct ctl_table_header * table) 2013 { 2014 } 2015 2016 void setup_sysctl_set(struct ctl_table_set *p, 2017 struct ctl_table_set *parent, 2018 int (*is_seen)(struct ctl_table_set *)) 2019 { 2020 } 2021 2022 void sysctl_head_put(struct ctl_table_header *head) 2023 { 2024 } 2025 2026 #endif /* CONFIG_SYSCTL */ 2027 2028 /* 2029 * /proc/sys support 2030 */ 2031 2032 #ifdef CONFIG_PROC_SYSCTL 2033 2034 static int _proc_do_string(void* data, int maxlen, int write, 2035 void __user *buffer, 2036 size_t *lenp, loff_t *ppos) 2037 { 2038 size_t len; 2039 char __user *p; 2040 char c; 2041 2042 if (!data || !maxlen || !*lenp) { 2043 *lenp = 0; 2044 return 0; 2045 } 2046 2047 if (write) { 2048 len = 0; 2049 p = buffer; 2050 while (len < *lenp) { 2051 if (get_user(c, p++)) 2052 return -EFAULT; 2053 if (c == 0 || c == '\n') 2054 break; 2055 len++; 2056 } 2057 if (len >= maxlen) 2058 len = maxlen-1; 2059 if(copy_from_user(data, buffer, len)) 2060 return -EFAULT; 2061 ((char *) data)[len] = 0; 2062 *ppos += *lenp; 2063 } else { 2064 len = strlen(data); 2065 if (len > maxlen) 2066 len = maxlen; 2067 2068 if (*ppos > len) { 2069 *lenp = 0; 2070 return 0; 2071 } 2072 2073 data += *ppos; 2074 len -= *ppos; 2075 2076 if (len > *lenp) 2077 len = *lenp; 2078 if (len) 2079 if(copy_to_user(buffer, data, len)) 2080 return -EFAULT; 2081 if (len < *lenp) { 2082 if(put_user('\n', ((char __user *) buffer) + len)) 2083 return -EFAULT; 2084 len++; 2085 } 2086 *lenp = len; 2087 *ppos += len; 2088 } 2089 return 0; 2090 } 2091 2092 /** 2093 * proc_dostring - read a string sysctl 2094 * @table: the sysctl table 2095 * @write: %TRUE if this is a write to the sysctl file 2096 * @buffer: the user buffer 2097 * @lenp: the size of the user buffer 2098 * @ppos: file position 2099 * 2100 * Reads/writes a string from/to the user buffer. If the kernel 2101 * buffer provided is not large enough to hold the string, the 2102 * string is truncated. The copied string is %NULL-terminated. 2103 * If the string is being read by the user process, it is copied 2104 * and a newline '\n' is added. It is truncated if the buffer is 2105 * not large enough. 2106 * 2107 * Returns 0 on success. 2108 */ 2109 int proc_dostring(struct ctl_table *table, int write, 2110 void __user *buffer, size_t *lenp, loff_t *ppos) 2111 { 2112 return _proc_do_string(table->data, table->maxlen, write, 2113 buffer, lenp, ppos); 2114 } 2115 2116 static size_t proc_skip_spaces(char **buf) 2117 { 2118 size_t ret; 2119 char *tmp = skip_spaces(*buf); 2120 ret = tmp - *buf; 2121 *buf = tmp; 2122 return ret; 2123 } 2124 2125 static void proc_skip_char(char **buf, size_t *size, const char v) 2126 { 2127 while (*size) { 2128 if (**buf != v) 2129 break; 2130 (*size)--; 2131 (*buf)++; 2132 } 2133 } 2134 2135 #define TMPBUFLEN 22 2136 /** 2137 * proc_get_long - reads an ASCII formatted integer from a user buffer 2138 * 2139 * @buf: a kernel buffer 2140 * @size: size of the kernel buffer 2141 * @val: this is where the number will be stored 2142 * @neg: set to %TRUE if number is negative 2143 * @perm_tr: a vector which contains the allowed trailers 2144 * @perm_tr_len: size of the perm_tr vector 2145 * @tr: pointer to store the trailer character 2146 * 2147 * In case of success %0 is returned and @buf and @size are updated with 2148 * the amount of bytes read. If @tr is non-NULL and a trailing 2149 * character exists (size is non-zero after returning from this 2150 * function), @tr is updated with the trailing character. 2151 */ 2152 static int proc_get_long(char **buf, size_t *size, 2153 unsigned long *val, bool *neg, 2154 const char *perm_tr, unsigned perm_tr_len, char *tr) 2155 { 2156 int len; 2157 char *p, tmp[TMPBUFLEN]; 2158 2159 if (!*size) 2160 return -EINVAL; 2161 2162 len = *size; 2163 if (len > TMPBUFLEN - 1) 2164 len = TMPBUFLEN - 1; 2165 2166 memcpy(tmp, *buf, len); 2167 2168 tmp[len] = 0; 2169 p = tmp; 2170 if (*p == '-' && *size > 1) { 2171 *neg = true; 2172 p++; 2173 } else 2174 *neg = false; 2175 if (!isdigit(*p)) 2176 return -EINVAL; 2177 2178 *val = simple_strtoul(p, &p, 0); 2179 2180 len = p - tmp; 2181 2182 /* We don't know if the next char is whitespace thus we may accept 2183 * invalid integers (e.g. 1234...a) or two integers instead of one 2184 * (e.g. 123...1). So lets not allow such large numbers. */ 2185 if (len == TMPBUFLEN - 1) 2186 return -EINVAL; 2187 2188 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2189 return -EINVAL; 2190 2191 if (tr && (len < *size)) 2192 *tr = *p; 2193 2194 *buf += len; 2195 *size -= len; 2196 2197 return 0; 2198 } 2199 2200 /** 2201 * proc_put_long - converts an integer to a decimal ASCII formatted string 2202 * 2203 * @buf: the user buffer 2204 * @size: the size of the user buffer 2205 * @val: the integer to be converted 2206 * @neg: sign of the number, %TRUE for negative 2207 * 2208 * In case of success %0 is returned and @buf and @size are updated with 2209 * the amount of bytes written. 2210 */ 2211 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2212 bool neg) 2213 { 2214 int len; 2215 char tmp[TMPBUFLEN], *p = tmp; 2216 2217 sprintf(p, "%s%lu", neg ? "-" : "", val); 2218 len = strlen(tmp); 2219 if (len > *size) 2220 len = *size; 2221 if (copy_to_user(*buf, tmp, len)) 2222 return -EFAULT; 2223 *size -= len; 2224 *buf += len; 2225 return 0; 2226 } 2227 #undef TMPBUFLEN 2228 2229 static int proc_put_char(void __user **buf, size_t *size, char c) 2230 { 2231 if (*size) { 2232 char __user **buffer = (char __user **)buf; 2233 if (put_user(c, *buffer)) 2234 return -EFAULT; 2235 (*size)--, (*buffer)++; 2236 *buf = *buffer; 2237 } 2238 return 0; 2239 } 2240 2241 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2242 int *valp, 2243 int write, void *data) 2244 { 2245 if (write) { 2246 *valp = *negp ? -*lvalp : *lvalp; 2247 } else { 2248 int val = *valp; 2249 if (val < 0) { 2250 *negp = true; 2251 *lvalp = (unsigned long)-val; 2252 } else { 2253 *negp = false; 2254 *lvalp = (unsigned long)val; 2255 } 2256 } 2257 return 0; 2258 } 2259 2260 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2261 2262 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2263 int write, void __user *buffer, 2264 size_t *lenp, loff_t *ppos, 2265 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2266 int write, void *data), 2267 void *data) 2268 { 2269 int *i, vleft, first = 1, err = 0; 2270 unsigned long page = 0; 2271 size_t left; 2272 char *kbuf; 2273 2274 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2275 *lenp = 0; 2276 return 0; 2277 } 2278 2279 i = (int *) tbl_data; 2280 vleft = table->maxlen / sizeof(*i); 2281 left = *lenp; 2282 2283 if (!conv) 2284 conv = do_proc_dointvec_conv; 2285 2286 if (write) { 2287 if (left > PAGE_SIZE - 1) 2288 left = PAGE_SIZE - 1; 2289 page = __get_free_page(GFP_TEMPORARY); 2290 kbuf = (char *) page; 2291 if (!kbuf) 2292 return -ENOMEM; 2293 if (copy_from_user(kbuf, buffer, left)) { 2294 err = -EFAULT; 2295 goto free; 2296 } 2297 kbuf[left] = 0; 2298 } 2299 2300 for (; left && vleft--; i++, first=0) { 2301 unsigned long lval; 2302 bool neg; 2303 2304 if (write) { 2305 left -= proc_skip_spaces(&kbuf); 2306 2307 if (!left) 2308 break; 2309 err = proc_get_long(&kbuf, &left, &lval, &neg, 2310 proc_wspace_sep, 2311 sizeof(proc_wspace_sep), NULL); 2312 if (err) 2313 break; 2314 if (conv(&neg, &lval, i, 1, data)) { 2315 err = -EINVAL; 2316 break; 2317 } 2318 } else { 2319 if (conv(&neg, &lval, i, 0, data)) { 2320 err = -EINVAL; 2321 break; 2322 } 2323 if (!first) 2324 err = proc_put_char(&buffer, &left, '\t'); 2325 if (err) 2326 break; 2327 err = proc_put_long(&buffer, &left, lval, neg); 2328 if (err) 2329 break; 2330 } 2331 } 2332 2333 if (!write && !first && left && !err) 2334 err = proc_put_char(&buffer, &left, '\n'); 2335 if (write && !err && left) 2336 left -= proc_skip_spaces(&kbuf); 2337 free: 2338 if (write) { 2339 free_page(page); 2340 if (first) 2341 return err ? : -EINVAL; 2342 } 2343 *lenp -= left; 2344 *ppos += *lenp; 2345 return err; 2346 } 2347 2348 static int do_proc_dointvec(struct ctl_table *table, int write, 2349 void __user *buffer, size_t *lenp, loff_t *ppos, 2350 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2351 int write, void *data), 2352 void *data) 2353 { 2354 return __do_proc_dointvec(table->data, table, write, 2355 buffer, lenp, ppos, conv, data); 2356 } 2357 2358 /** 2359 * proc_dointvec - read a vector of integers 2360 * @table: the sysctl table 2361 * @write: %TRUE if this is a write to the sysctl file 2362 * @buffer: the user buffer 2363 * @lenp: the size of the user buffer 2364 * @ppos: file position 2365 * 2366 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2367 * values from/to the user buffer, treated as an ASCII string. 2368 * 2369 * Returns 0 on success. 2370 */ 2371 int proc_dointvec(struct ctl_table *table, int write, 2372 void __user *buffer, size_t *lenp, loff_t *ppos) 2373 { 2374 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2375 NULL,NULL); 2376 } 2377 2378 /* 2379 * Taint values can only be increased 2380 * This means we can safely use a temporary. 2381 */ 2382 static int proc_taint(struct ctl_table *table, int write, 2383 void __user *buffer, size_t *lenp, loff_t *ppos) 2384 { 2385 struct ctl_table t; 2386 unsigned long tmptaint = get_taint(); 2387 int err; 2388 2389 if (write && !capable(CAP_SYS_ADMIN)) 2390 return -EPERM; 2391 2392 t = *table; 2393 t.data = &tmptaint; 2394 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2395 if (err < 0) 2396 return err; 2397 2398 if (write) { 2399 /* 2400 * Poor man's atomic or. Not worth adding a primitive 2401 * to everyone's atomic.h for this 2402 */ 2403 int i; 2404 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2405 if ((tmptaint >> i) & 1) 2406 add_taint(i); 2407 } 2408 } 2409 2410 return err; 2411 } 2412 2413 #ifdef CONFIG_PRINTK 2414 static int proc_dmesg_restrict(struct ctl_table *table, int write, 2415 void __user *buffer, size_t *lenp, loff_t *ppos) 2416 { 2417 if (write && !capable(CAP_SYS_ADMIN)) 2418 return -EPERM; 2419 2420 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2421 } 2422 #endif 2423 2424 struct do_proc_dointvec_minmax_conv_param { 2425 int *min; 2426 int *max; 2427 }; 2428 2429 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2430 int *valp, 2431 int write, void *data) 2432 { 2433 struct do_proc_dointvec_minmax_conv_param *param = data; 2434 if (write) { 2435 int val = *negp ? -*lvalp : *lvalp; 2436 if ((param->min && *param->min > val) || 2437 (param->max && *param->max < val)) 2438 return -EINVAL; 2439 *valp = val; 2440 } else { 2441 int val = *valp; 2442 if (val < 0) { 2443 *negp = true; 2444 *lvalp = (unsigned long)-val; 2445 } else { 2446 *negp = false; 2447 *lvalp = (unsigned long)val; 2448 } 2449 } 2450 return 0; 2451 } 2452 2453 /** 2454 * proc_dointvec_minmax - read a vector of integers with min/max values 2455 * @table: the sysctl table 2456 * @write: %TRUE if this is a write to the sysctl file 2457 * @buffer: the user buffer 2458 * @lenp: the size of the user buffer 2459 * @ppos: file position 2460 * 2461 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2462 * values from/to the user buffer, treated as an ASCII string. 2463 * 2464 * This routine will ensure the values are within the range specified by 2465 * table->extra1 (min) and table->extra2 (max). 2466 * 2467 * Returns 0 on success. 2468 */ 2469 int proc_dointvec_minmax(struct ctl_table *table, int write, 2470 void __user *buffer, size_t *lenp, loff_t *ppos) 2471 { 2472 struct do_proc_dointvec_minmax_conv_param param = { 2473 .min = (int *) table->extra1, 2474 .max = (int *) table->extra2, 2475 }; 2476 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2477 do_proc_dointvec_minmax_conv, ¶m); 2478 } 2479 2480 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2481 void __user *buffer, 2482 size_t *lenp, loff_t *ppos, 2483 unsigned long convmul, 2484 unsigned long convdiv) 2485 { 2486 unsigned long *i, *min, *max; 2487 int vleft, first = 1, err = 0; 2488 unsigned long page = 0; 2489 size_t left; 2490 char *kbuf; 2491 2492 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2493 *lenp = 0; 2494 return 0; 2495 } 2496 2497 i = (unsigned long *) data; 2498 min = (unsigned long *) table->extra1; 2499 max = (unsigned long *) table->extra2; 2500 vleft = table->maxlen / sizeof(unsigned long); 2501 left = *lenp; 2502 2503 if (write) { 2504 if (left > PAGE_SIZE - 1) 2505 left = PAGE_SIZE - 1; 2506 page = __get_free_page(GFP_TEMPORARY); 2507 kbuf = (char *) page; 2508 if (!kbuf) 2509 return -ENOMEM; 2510 if (copy_from_user(kbuf, buffer, left)) { 2511 err = -EFAULT; 2512 goto free; 2513 } 2514 kbuf[left] = 0; 2515 } 2516 2517 for (; left && vleft--; i++, first = 0) { 2518 unsigned long val; 2519 2520 if (write) { 2521 bool neg; 2522 2523 left -= proc_skip_spaces(&kbuf); 2524 2525 err = proc_get_long(&kbuf, &left, &val, &neg, 2526 proc_wspace_sep, 2527 sizeof(proc_wspace_sep), NULL); 2528 if (err) 2529 break; 2530 if (neg) 2531 continue; 2532 if ((min && val < *min) || (max && val > *max)) 2533 continue; 2534 *i = val; 2535 } else { 2536 val = convdiv * (*i) / convmul; 2537 if (!first) 2538 err = proc_put_char(&buffer, &left, '\t'); 2539 err = proc_put_long(&buffer, &left, val, false); 2540 if (err) 2541 break; 2542 } 2543 } 2544 2545 if (!write && !first && left && !err) 2546 err = proc_put_char(&buffer, &left, '\n'); 2547 if (write && !err) 2548 left -= proc_skip_spaces(&kbuf); 2549 free: 2550 if (write) { 2551 free_page(page); 2552 if (first) 2553 return err ? : -EINVAL; 2554 } 2555 *lenp -= left; 2556 *ppos += *lenp; 2557 return err; 2558 } 2559 2560 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2561 void __user *buffer, 2562 size_t *lenp, loff_t *ppos, 2563 unsigned long convmul, 2564 unsigned long convdiv) 2565 { 2566 return __do_proc_doulongvec_minmax(table->data, table, write, 2567 buffer, lenp, ppos, convmul, convdiv); 2568 } 2569 2570 /** 2571 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2572 * @table: the sysctl table 2573 * @write: %TRUE if this is a write to the sysctl file 2574 * @buffer: the user buffer 2575 * @lenp: the size of the user buffer 2576 * @ppos: file position 2577 * 2578 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2579 * values from/to the user buffer, treated as an ASCII string. 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_minmax(struct ctl_table *table, int write, 2587 void __user *buffer, size_t *lenp, loff_t *ppos) 2588 { 2589 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2590 } 2591 2592 /** 2593 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2594 * @table: the sysctl table 2595 * @write: %TRUE if this is a write to the sysctl file 2596 * @buffer: the user buffer 2597 * @lenp: the size of the user buffer 2598 * @ppos: file position 2599 * 2600 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2601 * values from/to the user buffer, treated as an ASCII string. The values 2602 * are treated as milliseconds, and converted to jiffies when they are stored. 2603 * 2604 * This routine will ensure the values are within the range specified by 2605 * table->extra1 (min) and table->extra2 (max). 2606 * 2607 * Returns 0 on success. 2608 */ 2609 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2610 void __user *buffer, 2611 size_t *lenp, loff_t *ppos) 2612 { 2613 return do_proc_doulongvec_minmax(table, write, buffer, 2614 lenp, ppos, HZ, 1000l); 2615 } 2616 2617 2618 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2619 int *valp, 2620 int write, void *data) 2621 { 2622 if (write) { 2623 if (*lvalp > LONG_MAX / HZ) 2624 return 1; 2625 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 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 = lval / HZ; 2637 } 2638 return 0; 2639 } 2640 2641 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2642 int *valp, 2643 int write, void *data) 2644 { 2645 if (write) { 2646 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2647 return 1; 2648 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2649 } else { 2650 int val = *valp; 2651 unsigned long lval; 2652 if (val < 0) { 2653 *negp = true; 2654 lval = (unsigned long)-val; 2655 } else { 2656 *negp = false; 2657 lval = (unsigned long)val; 2658 } 2659 *lvalp = jiffies_to_clock_t(lval); 2660 } 2661 return 0; 2662 } 2663 2664 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2665 int *valp, 2666 int write, void *data) 2667 { 2668 if (write) { 2669 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2670 } else { 2671 int val = *valp; 2672 unsigned long lval; 2673 if (val < 0) { 2674 *negp = true; 2675 lval = (unsigned long)-val; 2676 } else { 2677 *negp = false; 2678 lval = (unsigned long)val; 2679 } 2680 *lvalp = jiffies_to_msecs(lval); 2681 } 2682 return 0; 2683 } 2684 2685 /** 2686 * proc_dointvec_jiffies - read a vector of integers as seconds 2687 * @table: the sysctl table 2688 * @write: %TRUE if this is a write to the sysctl file 2689 * @buffer: the user buffer 2690 * @lenp: the size of the user buffer 2691 * @ppos: file position 2692 * 2693 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2694 * values from/to the user buffer, treated as an ASCII string. 2695 * The values read are assumed to be in seconds, and are converted into 2696 * jiffies. 2697 * 2698 * Returns 0 on success. 2699 */ 2700 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2701 void __user *buffer, size_t *lenp, loff_t *ppos) 2702 { 2703 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2704 do_proc_dointvec_jiffies_conv,NULL); 2705 } 2706 2707 /** 2708 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2709 * @table: the sysctl table 2710 * @write: %TRUE if this is a write to the sysctl file 2711 * @buffer: the user buffer 2712 * @lenp: the size of the user buffer 2713 * @ppos: pointer to the file position 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/USER_HZ seconds, and 2718 * are converted into jiffies. 2719 * 2720 * Returns 0 on success. 2721 */ 2722 int proc_dointvec_userhz_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_userhz_jiffies_conv,NULL); 2727 } 2728 2729 /** 2730 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2731 * @table: the sysctl table 2732 * @write: %TRUE if this is a write to the sysctl file 2733 * @buffer: the user buffer 2734 * @lenp: the size of the user buffer 2735 * @ppos: file position 2736 * @ppos: the current position in the file 2737 * 2738 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2739 * values from/to the user buffer, treated as an ASCII string. 2740 * The values read are assumed to be in 1/1000 seconds, and 2741 * are converted into jiffies. 2742 * 2743 * Returns 0 on success. 2744 */ 2745 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2746 void __user *buffer, size_t *lenp, loff_t *ppos) 2747 { 2748 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2749 do_proc_dointvec_ms_jiffies_conv, NULL); 2750 } 2751 2752 static int proc_do_cad_pid(struct ctl_table *table, int write, 2753 void __user *buffer, size_t *lenp, loff_t *ppos) 2754 { 2755 struct pid *new_pid; 2756 pid_t tmp; 2757 int r; 2758 2759 tmp = pid_vnr(cad_pid); 2760 2761 r = __do_proc_dointvec(&tmp, table, write, buffer, 2762 lenp, ppos, NULL, NULL); 2763 if (r || !write) 2764 return r; 2765 2766 new_pid = find_get_pid(tmp); 2767 if (!new_pid) 2768 return -ESRCH; 2769 2770 put_pid(xchg(&cad_pid, new_pid)); 2771 return 0; 2772 } 2773 2774 /** 2775 * proc_do_large_bitmap - read/write from/to a large bitmap 2776 * @table: the sysctl table 2777 * @write: %TRUE if this is a write to the sysctl file 2778 * @buffer: the user buffer 2779 * @lenp: the size of the user buffer 2780 * @ppos: file position 2781 * 2782 * The bitmap is stored at table->data and the bitmap length (in bits) 2783 * in table->maxlen. 2784 * 2785 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2786 * large bitmaps may be represented in a compact manner. Writing into 2787 * the file will clear the bitmap then update it with the given input. 2788 * 2789 * Returns 0 on success. 2790 */ 2791 int proc_do_large_bitmap(struct ctl_table *table, int write, 2792 void __user *buffer, size_t *lenp, loff_t *ppos) 2793 { 2794 int err = 0; 2795 bool first = 1; 2796 size_t left = *lenp; 2797 unsigned long bitmap_len = table->maxlen; 2798 unsigned long *bitmap = (unsigned long *) table->data; 2799 unsigned long *tmp_bitmap = NULL; 2800 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2801 2802 if (!bitmap_len || !left || (*ppos && !write)) { 2803 *lenp = 0; 2804 return 0; 2805 } 2806 2807 if (write) { 2808 unsigned long page = 0; 2809 char *kbuf; 2810 2811 if (left > PAGE_SIZE - 1) 2812 left = PAGE_SIZE - 1; 2813 2814 page = __get_free_page(GFP_TEMPORARY); 2815 kbuf = (char *) page; 2816 if (!kbuf) 2817 return -ENOMEM; 2818 if (copy_from_user(kbuf, buffer, left)) { 2819 free_page(page); 2820 return -EFAULT; 2821 } 2822 kbuf[left] = 0; 2823 2824 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2825 GFP_KERNEL); 2826 if (!tmp_bitmap) { 2827 free_page(page); 2828 return -ENOMEM; 2829 } 2830 proc_skip_char(&kbuf, &left, '\n'); 2831 while (!err && left) { 2832 unsigned long val_a, val_b; 2833 bool neg; 2834 2835 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2836 sizeof(tr_a), &c); 2837 if (err) 2838 break; 2839 if (val_a >= bitmap_len || neg) { 2840 err = -EINVAL; 2841 break; 2842 } 2843 2844 val_b = val_a; 2845 if (left) { 2846 kbuf++; 2847 left--; 2848 } 2849 2850 if (c == '-') { 2851 err = proc_get_long(&kbuf, &left, &val_b, 2852 &neg, tr_b, sizeof(tr_b), 2853 &c); 2854 if (err) 2855 break; 2856 if (val_b >= bitmap_len || neg || 2857 val_a > val_b) { 2858 err = -EINVAL; 2859 break; 2860 } 2861 if (left) { 2862 kbuf++; 2863 left--; 2864 } 2865 } 2866 2867 while (val_a <= val_b) 2868 set_bit(val_a++, tmp_bitmap); 2869 2870 first = 0; 2871 proc_skip_char(&kbuf, &left, '\n'); 2872 } 2873 free_page(page); 2874 } else { 2875 unsigned long bit_a, bit_b = 0; 2876 2877 while (left) { 2878 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2879 if (bit_a >= bitmap_len) 2880 break; 2881 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2882 bit_a + 1) - 1; 2883 2884 if (!first) { 2885 err = proc_put_char(&buffer, &left, ','); 2886 if (err) 2887 break; 2888 } 2889 err = proc_put_long(&buffer, &left, bit_a, false); 2890 if (err) 2891 break; 2892 if (bit_a != bit_b) { 2893 err = proc_put_char(&buffer, &left, '-'); 2894 if (err) 2895 break; 2896 err = proc_put_long(&buffer, &left, bit_b, false); 2897 if (err) 2898 break; 2899 } 2900 2901 first = 0; bit_b++; 2902 } 2903 if (!err) 2904 err = proc_put_char(&buffer, &left, '\n'); 2905 } 2906 2907 if (!err) { 2908 if (write) { 2909 if (*ppos) 2910 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2911 else 2912 memcpy(bitmap, tmp_bitmap, 2913 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2914 } 2915 kfree(tmp_bitmap); 2916 *lenp -= left; 2917 *ppos += *lenp; 2918 return 0; 2919 } else { 2920 kfree(tmp_bitmap); 2921 return err; 2922 } 2923 } 2924 2925 #else /* CONFIG_PROC_SYSCTL */ 2926 2927 int proc_dostring(struct ctl_table *table, int write, 2928 void __user *buffer, size_t *lenp, loff_t *ppos) 2929 { 2930 return -ENOSYS; 2931 } 2932 2933 int proc_dointvec(struct ctl_table *table, int write, 2934 void __user *buffer, size_t *lenp, loff_t *ppos) 2935 { 2936 return -ENOSYS; 2937 } 2938 2939 int proc_dointvec_minmax(struct ctl_table *table, int write, 2940 void __user *buffer, size_t *lenp, loff_t *ppos) 2941 { 2942 return -ENOSYS; 2943 } 2944 2945 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2946 void __user *buffer, size_t *lenp, loff_t *ppos) 2947 { 2948 return -ENOSYS; 2949 } 2950 2951 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2952 void __user *buffer, size_t *lenp, loff_t *ppos) 2953 { 2954 return -ENOSYS; 2955 } 2956 2957 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2958 void __user *buffer, size_t *lenp, loff_t *ppos) 2959 { 2960 return -ENOSYS; 2961 } 2962 2963 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2964 void __user *buffer, size_t *lenp, loff_t *ppos) 2965 { 2966 return -ENOSYS; 2967 } 2968 2969 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2970 void __user *buffer, 2971 size_t *lenp, loff_t *ppos) 2972 { 2973 return -ENOSYS; 2974 } 2975 2976 2977 #endif /* CONFIG_PROC_SYSCTL */ 2978 2979 /* 2980 * No sense putting this after each symbol definition, twice, 2981 * exception granted :-) 2982 */ 2983 EXPORT_SYMBOL(proc_dointvec); 2984 EXPORT_SYMBOL(proc_dointvec_jiffies); 2985 EXPORT_SYMBOL(proc_dointvec_minmax); 2986 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2987 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2988 EXPORT_SYMBOL(proc_dostring); 2989 EXPORT_SYMBOL(proc_doulongvec_minmax); 2990 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2991 EXPORT_SYMBOL(register_sysctl_table); 2992 EXPORT_SYMBOL(register_sysctl_paths); 2993 EXPORT_SYMBOL(unregister_sysctl_table); 2994