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 .procname = "perf_event_paranoid", 943 .data = &sysctl_perf_event_paranoid, 944 .maxlen = sizeof(sysctl_perf_event_paranoid), 945 .mode = 0644, 946 .proc_handler = proc_dointvec, 947 }, 948 { 949 .procname = "perf_event_mlock_kb", 950 .data = &sysctl_perf_event_mlock, 951 .maxlen = sizeof(sysctl_perf_event_mlock), 952 .mode = 0644, 953 .proc_handler = proc_dointvec, 954 }, 955 { 956 .procname = "perf_event_max_sample_rate", 957 .data = &sysctl_perf_event_sample_rate, 958 .maxlen = sizeof(sysctl_perf_event_sample_rate), 959 .mode = 0644, 960 .proc_handler = perf_proc_update_handler, 961 }, 962 #endif 963 #ifdef CONFIG_KMEMCHECK 964 { 965 .procname = "kmemcheck", 966 .data = &kmemcheck_enabled, 967 .maxlen = sizeof(int), 968 .mode = 0644, 969 .proc_handler = proc_dointvec, 970 }, 971 #endif 972 #ifdef CONFIG_BLOCK 973 { 974 .procname = "blk_iopoll", 975 .data = &blk_iopoll_enabled, 976 .maxlen = sizeof(int), 977 .mode = 0644, 978 .proc_handler = proc_dointvec, 979 }, 980 #endif 981 { } 982 }; 983 984 static struct ctl_table vm_table[] = { 985 { 986 .procname = "overcommit_memory", 987 .data = &sysctl_overcommit_memory, 988 .maxlen = sizeof(sysctl_overcommit_memory), 989 .mode = 0644, 990 .proc_handler = proc_dointvec_minmax, 991 .extra1 = &zero, 992 .extra2 = &two, 993 }, 994 { 995 .procname = "panic_on_oom", 996 .data = &sysctl_panic_on_oom, 997 .maxlen = sizeof(sysctl_panic_on_oom), 998 .mode = 0644, 999 .proc_handler = proc_dointvec_minmax, 1000 .extra1 = &zero, 1001 .extra2 = &two, 1002 }, 1003 { 1004 .procname = "oom_kill_allocating_task", 1005 .data = &sysctl_oom_kill_allocating_task, 1006 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1007 .mode = 0644, 1008 .proc_handler = proc_dointvec, 1009 }, 1010 { 1011 .procname = "oom_dump_tasks", 1012 .data = &sysctl_oom_dump_tasks, 1013 .maxlen = sizeof(sysctl_oom_dump_tasks), 1014 .mode = 0644, 1015 .proc_handler = proc_dointvec, 1016 }, 1017 { 1018 .procname = "overcommit_ratio", 1019 .data = &sysctl_overcommit_ratio, 1020 .maxlen = sizeof(sysctl_overcommit_ratio), 1021 .mode = 0644, 1022 .proc_handler = proc_dointvec, 1023 }, 1024 { 1025 .procname = "page-cluster", 1026 .data = &page_cluster, 1027 .maxlen = sizeof(int), 1028 .mode = 0644, 1029 .proc_handler = proc_dointvec_minmax, 1030 .extra1 = &zero, 1031 }, 1032 { 1033 .procname = "dirty_background_ratio", 1034 .data = &dirty_background_ratio, 1035 .maxlen = sizeof(dirty_background_ratio), 1036 .mode = 0644, 1037 .proc_handler = dirty_background_ratio_handler, 1038 .extra1 = &zero, 1039 .extra2 = &one_hundred, 1040 }, 1041 { 1042 .procname = "dirty_background_bytes", 1043 .data = &dirty_background_bytes, 1044 .maxlen = sizeof(dirty_background_bytes), 1045 .mode = 0644, 1046 .proc_handler = dirty_background_bytes_handler, 1047 .extra1 = &one_ul, 1048 }, 1049 { 1050 .procname = "dirty_ratio", 1051 .data = &vm_dirty_ratio, 1052 .maxlen = sizeof(vm_dirty_ratio), 1053 .mode = 0644, 1054 .proc_handler = dirty_ratio_handler, 1055 .extra1 = &zero, 1056 .extra2 = &one_hundred, 1057 }, 1058 { 1059 .procname = "dirty_bytes", 1060 .data = &vm_dirty_bytes, 1061 .maxlen = sizeof(vm_dirty_bytes), 1062 .mode = 0644, 1063 .proc_handler = dirty_bytes_handler, 1064 .extra1 = &dirty_bytes_min, 1065 }, 1066 { 1067 .procname = "dirty_writeback_centisecs", 1068 .data = &dirty_writeback_interval, 1069 .maxlen = sizeof(dirty_writeback_interval), 1070 .mode = 0644, 1071 .proc_handler = dirty_writeback_centisecs_handler, 1072 }, 1073 { 1074 .procname = "dirty_expire_centisecs", 1075 .data = &dirty_expire_interval, 1076 .maxlen = sizeof(dirty_expire_interval), 1077 .mode = 0644, 1078 .proc_handler = proc_dointvec_minmax, 1079 .extra1 = &zero, 1080 }, 1081 { 1082 .procname = "nr_pdflush_threads", 1083 .data = &nr_pdflush_threads, 1084 .maxlen = sizeof nr_pdflush_threads, 1085 .mode = 0444 /* read-only*/, 1086 .proc_handler = proc_dointvec, 1087 }, 1088 { 1089 .procname = "swappiness", 1090 .data = &vm_swappiness, 1091 .maxlen = sizeof(vm_swappiness), 1092 .mode = 0644, 1093 .proc_handler = proc_dointvec_minmax, 1094 .extra1 = &zero, 1095 .extra2 = &one_hundred, 1096 }, 1097 #ifdef CONFIG_HUGETLB_PAGE 1098 { 1099 .procname = "nr_hugepages", 1100 .data = NULL, 1101 .maxlen = sizeof(unsigned long), 1102 .mode = 0644, 1103 .proc_handler = hugetlb_sysctl_handler, 1104 .extra1 = (void *)&hugetlb_zero, 1105 .extra2 = (void *)&hugetlb_infinity, 1106 }, 1107 #ifdef CONFIG_NUMA 1108 { 1109 .procname = "nr_hugepages_mempolicy", 1110 .data = NULL, 1111 .maxlen = sizeof(unsigned long), 1112 .mode = 0644, 1113 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1114 .extra1 = (void *)&hugetlb_zero, 1115 .extra2 = (void *)&hugetlb_infinity, 1116 }, 1117 #endif 1118 { 1119 .procname = "hugetlb_shm_group", 1120 .data = &sysctl_hugetlb_shm_group, 1121 .maxlen = sizeof(gid_t), 1122 .mode = 0644, 1123 .proc_handler = proc_dointvec, 1124 }, 1125 { 1126 .procname = "hugepages_treat_as_movable", 1127 .data = &hugepages_treat_as_movable, 1128 .maxlen = sizeof(int), 1129 .mode = 0644, 1130 .proc_handler = hugetlb_treat_movable_handler, 1131 }, 1132 { 1133 .procname = "nr_overcommit_hugepages", 1134 .data = NULL, 1135 .maxlen = sizeof(unsigned long), 1136 .mode = 0644, 1137 .proc_handler = hugetlb_overcommit_handler, 1138 .extra1 = (void *)&hugetlb_zero, 1139 .extra2 = (void *)&hugetlb_infinity, 1140 }, 1141 #endif 1142 { 1143 .procname = "lowmem_reserve_ratio", 1144 .data = &sysctl_lowmem_reserve_ratio, 1145 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1146 .mode = 0644, 1147 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1148 }, 1149 { 1150 .procname = "drop_caches", 1151 .data = &sysctl_drop_caches, 1152 .maxlen = sizeof(int), 1153 .mode = 0644, 1154 .proc_handler = drop_caches_sysctl_handler, 1155 .extra1 = &one, 1156 .extra2 = &three, 1157 }, 1158 #ifdef CONFIG_COMPACTION 1159 { 1160 .procname = "compact_memory", 1161 .data = &sysctl_compact_memory, 1162 .maxlen = sizeof(int), 1163 .mode = 0200, 1164 .proc_handler = sysctl_compaction_handler, 1165 }, 1166 { 1167 .procname = "extfrag_threshold", 1168 .data = &sysctl_extfrag_threshold, 1169 .maxlen = sizeof(int), 1170 .mode = 0644, 1171 .proc_handler = sysctl_extfrag_handler, 1172 .extra1 = &min_extfrag_threshold, 1173 .extra2 = &max_extfrag_threshold, 1174 }, 1175 1176 #endif /* CONFIG_COMPACTION */ 1177 { 1178 .procname = "min_free_kbytes", 1179 .data = &min_free_kbytes, 1180 .maxlen = sizeof(min_free_kbytes), 1181 .mode = 0644, 1182 .proc_handler = min_free_kbytes_sysctl_handler, 1183 .extra1 = &zero, 1184 }, 1185 { 1186 .procname = "percpu_pagelist_fraction", 1187 .data = &percpu_pagelist_fraction, 1188 .maxlen = sizeof(percpu_pagelist_fraction), 1189 .mode = 0644, 1190 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1191 .extra1 = &min_percpu_pagelist_fract, 1192 }, 1193 #ifdef CONFIG_MMU 1194 { 1195 .procname = "max_map_count", 1196 .data = &sysctl_max_map_count, 1197 .maxlen = sizeof(sysctl_max_map_count), 1198 .mode = 0644, 1199 .proc_handler = proc_dointvec_minmax, 1200 .extra1 = &zero, 1201 }, 1202 #else 1203 { 1204 .procname = "nr_trim_pages", 1205 .data = &sysctl_nr_trim_pages, 1206 .maxlen = sizeof(sysctl_nr_trim_pages), 1207 .mode = 0644, 1208 .proc_handler = proc_dointvec_minmax, 1209 .extra1 = &zero, 1210 }, 1211 #endif 1212 { 1213 .procname = "laptop_mode", 1214 .data = &laptop_mode, 1215 .maxlen = sizeof(laptop_mode), 1216 .mode = 0644, 1217 .proc_handler = proc_dointvec_jiffies, 1218 }, 1219 { 1220 .procname = "block_dump", 1221 .data = &block_dump, 1222 .maxlen = sizeof(block_dump), 1223 .mode = 0644, 1224 .proc_handler = proc_dointvec, 1225 .extra1 = &zero, 1226 }, 1227 { 1228 .procname = "vfs_cache_pressure", 1229 .data = &sysctl_vfs_cache_pressure, 1230 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1231 .mode = 0644, 1232 .proc_handler = proc_dointvec, 1233 .extra1 = &zero, 1234 }, 1235 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1236 { 1237 .procname = "legacy_va_layout", 1238 .data = &sysctl_legacy_va_layout, 1239 .maxlen = sizeof(sysctl_legacy_va_layout), 1240 .mode = 0644, 1241 .proc_handler = proc_dointvec, 1242 .extra1 = &zero, 1243 }, 1244 #endif 1245 #ifdef CONFIG_NUMA 1246 { 1247 .procname = "zone_reclaim_mode", 1248 .data = &zone_reclaim_mode, 1249 .maxlen = sizeof(zone_reclaim_mode), 1250 .mode = 0644, 1251 .proc_handler = proc_dointvec, 1252 .extra1 = &zero, 1253 }, 1254 { 1255 .procname = "min_unmapped_ratio", 1256 .data = &sysctl_min_unmapped_ratio, 1257 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1258 .mode = 0644, 1259 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1260 .extra1 = &zero, 1261 .extra2 = &one_hundred, 1262 }, 1263 { 1264 .procname = "min_slab_ratio", 1265 .data = &sysctl_min_slab_ratio, 1266 .maxlen = sizeof(sysctl_min_slab_ratio), 1267 .mode = 0644, 1268 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1269 .extra1 = &zero, 1270 .extra2 = &one_hundred, 1271 }, 1272 #endif 1273 #ifdef CONFIG_SMP 1274 { 1275 .procname = "stat_interval", 1276 .data = &sysctl_stat_interval, 1277 .maxlen = sizeof(sysctl_stat_interval), 1278 .mode = 0644, 1279 .proc_handler = proc_dointvec_jiffies, 1280 }, 1281 #endif 1282 #ifdef CONFIG_MMU 1283 { 1284 .procname = "mmap_min_addr", 1285 .data = &dac_mmap_min_addr, 1286 .maxlen = sizeof(unsigned long), 1287 .mode = 0644, 1288 .proc_handler = mmap_min_addr_handler, 1289 }, 1290 #endif 1291 #ifdef CONFIG_NUMA 1292 { 1293 .procname = "numa_zonelist_order", 1294 .data = &numa_zonelist_order, 1295 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1296 .mode = 0644, 1297 .proc_handler = numa_zonelist_order_handler, 1298 }, 1299 #endif 1300 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1301 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1302 { 1303 .procname = "vdso_enabled", 1304 .data = &vdso_enabled, 1305 .maxlen = sizeof(vdso_enabled), 1306 .mode = 0644, 1307 .proc_handler = proc_dointvec, 1308 .extra1 = &zero, 1309 }, 1310 #endif 1311 #ifdef CONFIG_HIGHMEM 1312 { 1313 .procname = "highmem_is_dirtyable", 1314 .data = &vm_highmem_is_dirtyable, 1315 .maxlen = sizeof(vm_highmem_is_dirtyable), 1316 .mode = 0644, 1317 .proc_handler = proc_dointvec_minmax, 1318 .extra1 = &zero, 1319 .extra2 = &one, 1320 }, 1321 #endif 1322 { 1323 .procname = "scan_unevictable_pages", 1324 .data = &scan_unevictable_pages, 1325 .maxlen = sizeof(scan_unevictable_pages), 1326 .mode = 0644, 1327 .proc_handler = scan_unevictable_handler, 1328 }, 1329 #ifdef CONFIG_MEMORY_FAILURE 1330 { 1331 .procname = "memory_failure_early_kill", 1332 .data = &sysctl_memory_failure_early_kill, 1333 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1334 .mode = 0644, 1335 .proc_handler = proc_dointvec_minmax, 1336 .extra1 = &zero, 1337 .extra2 = &one, 1338 }, 1339 { 1340 .procname = "memory_failure_recovery", 1341 .data = &sysctl_memory_failure_recovery, 1342 .maxlen = sizeof(sysctl_memory_failure_recovery), 1343 .mode = 0644, 1344 .proc_handler = proc_dointvec_minmax, 1345 .extra1 = &zero, 1346 .extra2 = &one, 1347 }, 1348 #endif 1349 { } 1350 }; 1351 1352 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1353 static struct ctl_table binfmt_misc_table[] = { 1354 { } 1355 }; 1356 #endif 1357 1358 static struct ctl_table fs_table[] = { 1359 { 1360 .procname = "inode-nr", 1361 .data = &inodes_stat, 1362 .maxlen = 2*sizeof(int), 1363 .mode = 0444, 1364 .proc_handler = proc_nr_inodes, 1365 }, 1366 { 1367 .procname = "inode-state", 1368 .data = &inodes_stat, 1369 .maxlen = 7*sizeof(int), 1370 .mode = 0444, 1371 .proc_handler = proc_nr_inodes, 1372 }, 1373 { 1374 .procname = "file-nr", 1375 .data = &files_stat, 1376 .maxlen = sizeof(files_stat), 1377 .mode = 0444, 1378 .proc_handler = proc_nr_files, 1379 }, 1380 { 1381 .procname = "file-max", 1382 .data = &files_stat.max_files, 1383 .maxlen = sizeof(files_stat.max_files), 1384 .mode = 0644, 1385 .proc_handler = proc_doulongvec_minmax, 1386 }, 1387 { 1388 .procname = "nr_open", 1389 .data = &sysctl_nr_open, 1390 .maxlen = sizeof(int), 1391 .mode = 0644, 1392 .proc_handler = proc_dointvec_minmax, 1393 .extra1 = &sysctl_nr_open_min, 1394 .extra2 = &sysctl_nr_open_max, 1395 }, 1396 { 1397 .procname = "dentry-state", 1398 .data = &dentry_stat, 1399 .maxlen = 6*sizeof(int), 1400 .mode = 0444, 1401 .proc_handler = proc_nr_dentry, 1402 }, 1403 { 1404 .procname = "overflowuid", 1405 .data = &fs_overflowuid, 1406 .maxlen = sizeof(int), 1407 .mode = 0644, 1408 .proc_handler = proc_dointvec_minmax, 1409 .extra1 = &minolduid, 1410 .extra2 = &maxolduid, 1411 }, 1412 { 1413 .procname = "overflowgid", 1414 .data = &fs_overflowgid, 1415 .maxlen = sizeof(int), 1416 .mode = 0644, 1417 .proc_handler = proc_dointvec_minmax, 1418 .extra1 = &minolduid, 1419 .extra2 = &maxolduid, 1420 }, 1421 #ifdef CONFIG_FILE_LOCKING 1422 { 1423 .procname = "leases-enable", 1424 .data = &leases_enable, 1425 .maxlen = sizeof(int), 1426 .mode = 0644, 1427 .proc_handler = proc_dointvec, 1428 }, 1429 #endif 1430 #ifdef CONFIG_DNOTIFY 1431 { 1432 .procname = "dir-notify-enable", 1433 .data = &dir_notify_enable, 1434 .maxlen = sizeof(int), 1435 .mode = 0644, 1436 .proc_handler = proc_dointvec, 1437 }, 1438 #endif 1439 #ifdef CONFIG_MMU 1440 #ifdef CONFIG_FILE_LOCKING 1441 { 1442 .procname = "lease-break-time", 1443 .data = &lease_break_time, 1444 .maxlen = sizeof(int), 1445 .mode = 0644, 1446 .proc_handler = proc_dointvec, 1447 }, 1448 #endif 1449 #ifdef CONFIG_AIO 1450 { 1451 .procname = "aio-nr", 1452 .data = &aio_nr, 1453 .maxlen = sizeof(aio_nr), 1454 .mode = 0444, 1455 .proc_handler = proc_doulongvec_minmax, 1456 }, 1457 { 1458 .procname = "aio-max-nr", 1459 .data = &aio_max_nr, 1460 .maxlen = sizeof(aio_max_nr), 1461 .mode = 0644, 1462 .proc_handler = proc_doulongvec_minmax, 1463 }, 1464 #endif /* CONFIG_AIO */ 1465 #ifdef CONFIG_INOTIFY_USER 1466 { 1467 .procname = "inotify", 1468 .mode = 0555, 1469 .child = inotify_table, 1470 }, 1471 #endif 1472 #ifdef CONFIG_EPOLL 1473 { 1474 .procname = "epoll", 1475 .mode = 0555, 1476 .child = epoll_table, 1477 }, 1478 #endif 1479 #endif 1480 { 1481 .procname = "suid_dumpable", 1482 .data = &suid_dumpable, 1483 .maxlen = sizeof(int), 1484 .mode = 0644, 1485 .proc_handler = proc_dointvec_minmax, 1486 .extra1 = &zero, 1487 .extra2 = &two, 1488 }, 1489 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1490 { 1491 .procname = "binfmt_misc", 1492 .mode = 0555, 1493 .child = binfmt_misc_table, 1494 }, 1495 #endif 1496 { 1497 .procname = "pipe-max-size", 1498 .data = &pipe_max_size, 1499 .maxlen = sizeof(int), 1500 .mode = 0644, 1501 .proc_handler = &pipe_proc_fn, 1502 .extra1 = &pipe_min_size, 1503 }, 1504 { } 1505 }; 1506 1507 static struct ctl_table debug_table[] = { 1508 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1509 defined(CONFIG_S390) || defined(CONFIG_TILE) 1510 { 1511 .procname = "exception-trace", 1512 .data = &show_unhandled_signals, 1513 .maxlen = sizeof(int), 1514 .mode = 0644, 1515 .proc_handler = proc_dointvec 1516 }, 1517 #endif 1518 #if defined(CONFIG_OPTPROBES) 1519 { 1520 .procname = "kprobes-optimization", 1521 .data = &sysctl_kprobes_optimization, 1522 .maxlen = sizeof(int), 1523 .mode = 0644, 1524 .proc_handler = proc_kprobes_optimization_handler, 1525 .extra1 = &zero, 1526 .extra2 = &one, 1527 }, 1528 #endif 1529 { } 1530 }; 1531 1532 static struct ctl_table dev_table[] = { 1533 { } 1534 }; 1535 1536 static DEFINE_SPINLOCK(sysctl_lock); 1537 1538 /* called under sysctl_lock */ 1539 static int use_table(struct ctl_table_header *p) 1540 { 1541 if (unlikely(p->unregistering)) 1542 return 0; 1543 p->used++; 1544 return 1; 1545 } 1546 1547 /* called under sysctl_lock */ 1548 static void unuse_table(struct ctl_table_header *p) 1549 { 1550 if (!--p->used) 1551 if (unlikely(p->unregistering)) 1552 complete(p->unregistering); 1553 } 1554 1555 /* called under sysctl_lock, will reacquire if has to wait */ 1556 static void start_unregistering(struct ctl_table_header *p) 1557 { 1558 /* 1559 * if p->used is 0, nobody will ever touch that entry again; 1560 * we'll eliminate all paths to it before dropping sysctl_lock 1561 */ 1562 if (unlikely(p->used)) { 1563 struct completion wait; 1564 init_completion(&wait); 1565 p->unregistering = &wait; 1566 spin_unlock(&sysctl_lock); 1567 wait_for_completion(&wait); 1568 spin_lock(&sysctl_lock); 1569 } else { 1570 /* anything non-NULL; we'll never dereference it */ 1571 p->unregistering = ERR_PTR(-EINVAL); 1572 } 1573 /* 1574 * do not remove from the list until nobody holds it; walking the 1575 * list in do_sysctl() relies on that. 1576 */ 1577 list_del_init(&p->ctl_entry); 1578 } 1579 1580 void sysctl_head_get(struct ctl_table_header *head) 1581 { 1582 spin_lock(&sysctl_lock); 1583 head->count++; 1584 spin_unlock(&sysctl_lock); 1585 } 1586 1587 static void free_head(struct rcu_head *rcu) 1588 { 1589 kfree(container_of(rcu, struct ctl_table_header, rcu)); 1590 } 1591 1592 void sysctl_head_put(struct ctl_table_header *head) 1593 { 1594 spin_lock(&sysctl_lock); 1595 if (!--head->count) 1596 call_rcu(&head->rcu, free_head); 1597 spin_unlock(&sysctl_lock); 1598 } 1599 1600 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1601 { 1602 if (!head) 1603 BUG(); 1604 spin_lock(&sysctl_lock); 1605 if (!use_table(head)) 1606 head = ERR_PTR(-ENOENT); 1607 spin_unlock(&sysctl_lock); 1608 return head; 1609 } 1610 1611 void sysctl_head_finish(struct ctl_table_header *head) 1612 { 1613 if (!head) 1614 return; 1615 spin_lock(&sysctl_lock); 1616 unuse_table(head); 1617 spin_unlock(&sysctl_lock); 1618 } 1619 1620 static struct ctl_table_set * 1621 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1622 { 1623 struct ctl_table_set *set = &root->default_set; 1624 if (root->lookup) 1625 set = root->lookup(root, namespaces); 1626 return set; 1627 } 1628 1629 static struct list_head * 1630 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1631 { 1632 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1633 return &set->list; 1634 } 1635 1636 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1637 struct ctl_table_header *prev) 1638 { 1639 struct ctl_table_root *root; 1640 struct list_head *header_list; 1641 struct ctl_table_header *head; 1642 struct list_head *tmp; 1643 1644 spin_lock(&sysctl_lock); 1645 if (prev) { 1646 head = prev; 1647 tmp = &prev->ctl_entry; 1648 unuse_table(prev); 1649 goto next; 1650 } 1651 tmp = &root_table_header.ctl_entry; 1652 for (;;) { 1653 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1654 1655 if (!use_table(head)) 1656 goto next; 1657 spin_unlock(&sysctl_lock); 1658 return head; 1659 next: 1660 root = head->root; 1661 tmp = tmp->next; 1662 header_list = lookup_header_list(root, namespaces); 1663 if (tmp != header_list) 1664 continue; 1665 1666 do { 1667 root = list_entry(root->root_list.next, 1668 struct ctl_table_root, root_list); 1669 if (root == &sysctl_table_root) 1670 goto out; 1671 header_list = lookup_header_list(root, namespaces); 1672 } while (list_empty(header_list)); 1673 tmp = header_list->next; 1674 } 1675 out: 1676 spin_unlock(&sysctl_lock); 1677 return NULL; 1678 } 1679 1680 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1681 { 1682 return __sysctl_head_next(current->nsproxy, prev); 1683 } 1684 1685 void register_sysctl_root(struct ctl_table_root *root) 1686 { 1687 spin_lock(&sysctl_lock); 1688 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1689 spin_unlock(&sysctl_lock); 1690 } 1691 1692 /* 1693 * sysctl_perm does NOT grant the superuser all rights automatically, because 1694 * some sysctl variables are readonly even to root. 1695 */ 1696 1697 static int test_perm(int mode, int op) 1698 { 1699 if (!current_euid()) 1700 mode >>= 6; 1701 else if (in_egroup_p(0)) 1702 mode >>= 3; 1703 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1704 return 0; 1705 return -EACCES; 1706 } 1707 1708 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1709 { 1710 int mode; 1711 1712 if (root->permissions) 1713 mode = root->permissions(root, current->nsproxy, table); 1714 else 1715 mode = table->mode; 1716 1717 return test_perm(mode, op); 1718 } 1719 1720 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1721 { 1722 for (; table->procname; table++) { 1723 table->parent = parent; 1724 if (table->child) 1725 sysctl_set_parent(table, table->child); 1726 } 1727 } 1728 1729 static __init int sysctl_init(void) 1730 { 1731 sysctl_set_parent(NULL, root_table); 1732 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1733 sysctl_check_table(current->nsproxy, root_table); 1734 #endif 1735 return 0; 1736 } 1737 1738 core_initcall(sysctl_init); 1739 1740 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1741 struct ctl_table *table) 1742 { 1743 struct ctl_table *p; 1744 const char *s = branch->procname; 1745 1746 /* branch should have named subdirectory as its first element */ 1747 if (!s || !branch->child) 1748 return NULL; 1749 1750 /* ... and nothing else */ 1751 if (branch[1].procname) 1752 return NULL; 1753 1754 /* table should contain subdirectory with the same name */ 1755 for (p = table; p->procname; p++) { 1756 if (!p->child) 1757 continue; 1758 if (p->procname && strcmp(p->procname, s) == 0) 1759 return p; 1760 } 1761 return NULL; 1762 } 1763 1764 /* see if attaching q to p would be an improvement */ 1765 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1766 { 1767 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1768 struct ctl_table *next; 1769 int is_better = 0; 1770 int not_in_parent = !p->attached_by; 1771 1772 while ((next = is_branch_in(by, to)) != NULL) { 1773 if (by == q->attached_by) 1774 is_better = 1; 1775 if (to == p->attached_by) 1776 not_in_parent = 1; 1777 by = by->child; 1778 to = next->child; 1779 } 1780 1781 if (is_better && not_in_parent) { 1782 q->attached_by = by; 1783 q->attached_to = to; 1784 q->parent = p; 1785 } 1786 } 1787 1788 /** 1789 * __register_sysctl_paths - register a sysctl hierarchy 1790 * @root: List of sysctl headers to register on 1791 * @namespaces: Data to compute which lists of sysctl entries are visible 1792 * @path: The path to the directory the sysctl table is in. 1793 * @table: the top-level table structure 1794 * 1795 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1796 * array. A completely 0 filled entry terminates the table. 1797 * 1798 * The members of the &struct ctl_table structure are used as follows: 1799 * 1800 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1801 * enter a sysctl file 1802 * 1803 * data - a pointer to data for use by proc_handler 1804 * 1805 * maxlen - the maximum size in bytes of the data 1806 * 1807 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1808 * 1809 * child - a pointer to the child sysctl table if this entry is a directory, or 1810 * %NULL. 1811 * 1812 * proc_handler - the text handler routine (described below) 1813 * 1814 * de - for internal use by the sysctl routines 1815 * 1816 * extra1, extra2 - extra pointers usable by the proc handler routines 1817 * 1818 * Leaf nodes in the sysctl tree will be represented by a single file 1819 * under /proc; non-leaf nodes will be represented by directories. 1820 * 1821 * sysctl(2) can automatically manage read and write requests through 1822 * the sysctl table. The data and maxlen fields of the ctl_table 1823 * struct enable minimal validation of the values being written to be 1824 * performed, and the mode field allows minimal authentication. 1825 * 1826 * There must be a proc_handler routine for any terminal nodes 1827 * mirrored under /proc/sys (non-terminals are handled by a built-in 1828 * directory handler). Several default handlers are available to 1829 * cover common cases - 1830 * 1831 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1832 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1833 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1834 * 1835 * It is the handler's job to read the input buffer from user memory 1836 * and process it. The handler should return 0 on success. 1837 * 1838 * This routine returns %NULL on a failure to register, and a pointer 1839 * to the table header on success. 1840 */ 1841 struct ctl_table_header *__register_sysctl_paths( 1842 struct ctl_table_root *root, 1843 struct nsproxy *namespaces, 1844 const struct ctl_path *path, struct ctl_table *table) 1845 { 1846 struct ctl_table_header *header; 1847 struct ctl_table *new, **prevp; 1848 unsigned int n, npath; 1849 struct ctl_table_set *set; 1850 1851 /* Count the path components */ 1852 for (npath = 0; path[npath].procname; ++npath) 1853 ; 1854 1855 /* 1856 * For each path component, allocate a 2-element ctl_table array. 1857 * The first array element will be filled with the sysctl entry 1858 * for this, the second will be the sentinel (procname == 0). 1859 * 1860 * We allocate everything in one go so that we don't have to 1861 * worry about freeing additional memory in unregister_sysctl_table. 1862 */ 1863 header = kzalloc(sizeof(struct ctl_table_header) + 1864 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1865 if (!header) 1866 return NULL; 1867 1868 new = (struct ctl_table *) (header + 1); 1869 1870 /* Now connect the dots */ 1871 prevp = &header->ctl_table; 1872 for (n = 0; n < npath; ++n, ++path) { 1873 /* Copy the procname */ 1874 new->procname = path->procname; 1875 new->mode = 0555; 1876 1877 *prevp = new; 1878 prevp = &new->child; 1879 1880 new += 2; 1881 } 1882 *prevp = table; 1883 header->ctl_table_arg = table; 1884 1885 INIT_LIST_HEAD(&header->ctl_entry); 1886 header->used = 0; 1887 header->unregistering = NULL; 1888 header->root = root; 1889 sysctl_set_parent(NULL, header->ctl_table); 1890 header->count = 1; 1891 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1892 if (sysctl_check_table(namespaces, header->ctl_table)) { 1893 kfree(header); 1894 return NULL; 1895 } 1896 #endif 1897 spin_lock(&sysctl_lock); 1898 header->set = lookup_header_set(root, namespaces); 1899 header->attached_by = header->ctl_table; 1900 header->attached_to = root_table; 1901 header->parent = &root_table_header; 1902 for (set = header->set; set; set = set->parent) { 1903 struct ctl_table_header *p; 1904 list_for_each_entry(p, &set->list, ctl_entry) { 1905 if (p->unregistering) 1906 continue; 1907 try_attach(p, header); 1908 } 1909 } 1910 header->parent->count++; 1911 list_add_tail(&header->ctl_entry, &header->set->list); 1912 spin_unlock(&sysctl_lock); 1913 1914 return header; 1915 } 1916 1917 /** 1918 * register_sysctl_table_path - register a sysctl table hierarchy 1919 * @path: The path to the directory the sysctl table is in. 1920 * @table: the top-level table structure 1921 * 1922 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1923 * array. A completely 0 filled entry terminates the table. 1924 * 1925 * See __register_sysctl_paths for more details. 1926 */ 1927 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1928 struct ctl_table *table) 1929 { 1930 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1931 path, table); 1932 } 1933 1934 /** 1935 * register_sysctl_table - register a sysctl table hierarchy 1936 * @table: the top-level table structure 1937 * 1938 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1939 * array. A completely 0 filled entry terminates the table. 1940 * 1941 * See register_sysctl_paths for more details. 1942 */ 1943 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1944 { 1945 static const struct ctl_path null_path[] = { {} }; 1946 1947 return register_sysctl_paths(null_path, table); 1948 } 1949 1950 /** 1951 * unregister_sysctl_table - unregister a sysctl table hierarchy 1952 * @header: the header returned from register_sysctl_table 1953 * 1954 * Unregisters the sysctl table and all children. proc entries may not 1955 * actually be removed until they are no longer used by anyone. 1956 */ 1957 void unregister_sysctl_table(struct ctl_table_header * header) 1958 { 1959 might_sleep(); 1960 1961 if (header == NULL) 1962 return; 1963 1964 spin_lock(&sysctl_lock); 1965 start_unregistering(header); 1966 if (!--header->parent->count) { 1967 WARN_ON(1); 1968 call_rcu(&header->parent->rcu, free_head); 1969 } 1970 if (!--header->count) 1971 call_rcu(&header->rcu, free_head); 1972 spin_unlock(&sysctl_lock); 1973 } 1974 1975 int sysctl_is_seen(struct ctl_table_header *p) 1976 { 1977 struct ctl_table_set *set = p->set; 1978 int res; 1979 spin_lock(&sysctl_lock); 1980 if (p->unregistering) 1981 res = 0; 1982 else if (!set->is_seen) 1983 res = 1; 1984 else 1985 res = set->is_seen(set); 1986 spin_unlock(&sysctl_lock); 1987 return res; 1988 } 1989 1990 void setup_sysctl_set(struct ctl_table_set *p, 1991 struct ctl_table_set *parent, 1992 int (*is_seen)(struct ctl_table_set *)) 1993 { 1994 INIT_LIST_HEAD(&p->list); 1995 p->parent = parent ? parent : &sysctl_table_root.default_set; 1996 p->is_seen = is_seen; 1997 } 1998 1999 #else /* !CONFIG_SYSCTL */ 2000 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2001 { 2002 return NULL; 2003 } 2004 2005 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2006 struct ctl_table *table) 2007 { 2008 return NULL; 2009 } 2010 2011 void unregister_sysctl_table(struct ctl_table_header * table) 2012 { 2013 } 2014 2015 void setup_sysctl_set(struct ctl_table_set *p, 2016 struct ctl_table_set *parent, 2017 int (*is_seen)(struct ctl_table_set *)) 2018 { 2019 } 2020 2021 void sysctl_head_put(struct ctl_table_header *head) 2022 { 2023 } 2024 2025 #endif /* CONFIG_SYSCTL */ 2026 2027 /* 2028 * /proc/sys support 2029 */ 2030 2031 #ifdef CONFIG_PROC_SYSCTL 2032 2033 static int _proc_do_string(void* data, int maxlen, int write, 2034 void __user *buffer, 2035 size_t *lenp, loff_t *ppos) 2036 { 2037 size_t len; 2038 char __user *p; 2039 char c; 2040 2041 if (!data || !maxlen || !*lenp) { 2042 *lenp = 0; 2043 return 0; 2044 } 2045 2046 if (write) { 2047 len = 0; 2048 p = buffer; 2049 while (len < *lenp) { 2050 if (get_user(c, p++)) 2051 return -EFAULT; 2052 if (c == 0 || c == '\n') 2053 break; 2054 len++; 2055 } 2056 if (len >= maxlen) 2057 len = maxlen-1; 2058 if(copy_from_user(data, buffer, len)) 2059 return -EFAULT; 2060 ((char *) data)[len] = 0; 2061 *ppos += *lenp; 2062 } else { 2063 len = strlen(data); 2064 if (len > maxlen) 2065 len = maxlen; 2066 2067 if (*ppos > len) { 2068 *lenp = 0; 2069 return 0; 2070 } 2071 2072 data += *ppos; 2073 len -= *ppos; 2074 2075 if (len > *lenp) 2076 len = *lenp; 2077 if (len) 2078 if(copy_to_user(buffer, data, len)) 2079 return -EFAULT; 2080 if (len < *lenp) { 2081 if(put_user('\n', ((char __user *) buffer) + len)) 2082 return -EFAULT; 2083 len++; 2084 } 2085 *lenp = len; 2086 *ppos += len; 2087 } 2088 return 0; 2089 } 2090 2091 /** 2092 * proc_dostring - read a string sysctl 2093 * @table: the sysctl table 2094 * @write: %TRUE if this is a write to the sysctl file 2095 * @buffer: the user buffer 2096 * @lenp: the size of the user buffer 2097 * @ppos: file position 2098 * 2099 * Reads/writes a string from/to the user buffer. If the kernel 2100 * buffer provided is not large enough to hold the string, the 2101 * string is truncated. The copied string is %NULL-terminated. 2102 * If the string is being read by the user process, it is copied 2103 * and a newline '\n' is added. It is truncated if the buffer is 2104 * not large enough. 2105 * 2106 * Returns 0 on success. 2107 */ 2108 int proc_dostring(struct ctl_table *table, int write, 2109 void __user *buffer, size_t *lenp, loff_t *ppos) 2110 { 2111 return _proc_do_string(table->data, table->maxlen, write, 2112 buffer, lenp, ppos); 2113 } 2114 2115 static size_t proc_skip_spaces(char **buf) 2116 { 2117 size_t ret; 2118 char *tmp = skip_spaces(*buf); 2119 ret = tmp - *buf; 2120 *buf = tmp; 2121 return ret; 2122 } 2123 2124 static void proc_skip_char(char **buf, size_t *size, const char v) 2125 { 2126 while (*size) { 2127 if (**buf != v) 2128 break; 2129 (*size)--; 2130 (*buf)++; 2131 } 2132 } 2133 2134 #define TMPBUFLEN 22 2135 /** 2136 * proc_get_long - reads an ASCII formatted integer from a user buffer 2137 * 2138 * @buf: a kernel buffer 2139 * @size: size of the kernel buffer 2140 * @val: this is where the number will be stored 2141 * @neg: set to %TRUE if number is negative 2142 * @perm_tr: a vector which contains the allowed trailers 2143 * @perm_tr_len: size of the perm_tr vector 2144 * @tr: pointer to store the trailer character 2145 * 2146 * In case of success %0 is returned and @buf and @size are updated with 2147 * the amount of bytes read. If @tr is non-NULL and a trailing 2148 * character exists (size is non-zero after returning from this 2149 * function), @tr is updated with the trailing character. 2150 */ 2151 static int proc_get_long(char **buf, size_t *size, 2152 unsigned long *val, bool *neg, 2153 const char *perm_tr, unsigned perm_tr_len, char *tr) 2154 { 2155 int len; 2156 char *p, tmp[TMPBUFLEN]; 2157 2158 if (!*size) 2159 return -EINVAL; 2160 2161 len = *size; 2162 if (len > TMPBUFLEN - 1) 2163 len = TMPBUFLEN - 1; 2164 2165 memcpy(tmp, *buf, len); 2166 2167 tmp[len] = 0; 2168 p = tmp; 2169 if (*p == '-' && *size > 1) { 2170 *neg = true; 2171 p++; 2172 } else 2173 *neg = false; 2174 if (!isdigit(*p)) 2175 return -EINVAL; 2176 2177 *val = simple_strtoul(p, &p, 0); 2178 2179 len = p - tmp; 2180 2181 /* We don't know if the next char is whitespace thus we may accept 2182 * invalid integers (e.g. 1234...a) or two integers instead of one 2183 * (e.g. 123...1). So lets not allow such large numbers. */ 2184 if (len == TMPBUFLEN - 1) 2185 return -EINVAL; 2186 2187 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2188 return -EINVAL; 2189 2190 if (tr && (len < *size)) 2191 *tr = *p; 2192 2193 *buf += len; 2194 *size -= len; 2195 2196 return 0; 2197 } 2198 2199 /** 2200 * proc_put_long - converts an integer to a decimal ASCII formatted string 2201 * 2202 * @buf: the user buffer 2203 * @size: the size of the user buffer 2204 * @val: the integer to be converted 2205 * @neg: sign of the number, %TRUE for negative 2206 * 2207 * In case of success %0 is returned and @buf and @size are updated with 2208 * the amount of bytes written. 2209 */ 2210 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2211 bool neg) 2212 { 2213 int len; 2214 char tmp[TMPBUFLEN], *p = tmp; 2215 2216 sprintf(p, "%s%lu", neg ? "-" : "", val); 2217 len = strlen(tmp); 2218 if (len > *size) 2219 len = *size; 2220 if (copy_to_user(*buf, tmp, len)) 2221 return -EFAULT; 2222 *size -= len; 2223 *buf += len; 2224 return 0; 2225 } 2226 #undef TMPBUFLEN 2227 2228 static int proc_put_char(void __user **buf, size_t *size, char c) 2229 { 2230 if (*size) { 2231 char __user **buffer = (char __user **)buf; 2232 if (put_user(c, *buffer)) 2233 return -EFAULT; 2234 (*size)--, (*buffer)++; 2235 *buf = *buffer; 2236 } 2237 return 0; 2238 } 2239 2240 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2241 int *valp, 2242 int write, void *data) 2243 { 2244 if (write) { 2245 *valp = *negp ? -*lvalp : *lvalp; 2246 } else { 2247 int val = *valp; 2248 if (val < 0) { 2249 *negp = true; 2250 *lvalp = (unsigned long)-val; 2251 } else { 2252 *negp = false; 2253 *lvalp = (unsigned long)val; 2254 } 2255 } 2256 return 0; 2257 } 2258 2259 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2260 2261 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2262 int write, void __user *buffer, 2263 size_t *lenp, loff_t *ppos, 2264 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2265 int write, void *data), 2266 void *data) 2267 { 2268 int *i, vleft, first = 1, err = 0; 2269 unsigned long page = 0; 2270 size_t left; 2271 char *kbuf; 2272 2273 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2274 *lenp = 0; 2275 return 0; 2276 } 2277 2278 i = (int *) tbl_data; 2279 vleft = table->maxlen / sizeof(*i); 2280 left = *lenp; 2281 2282 if (!conv) 2283 conv = do_proc_dointvec_conv; 2284 2285 if (write) { 2286 if (left > PAGE_SIZE - 1) 2287 left = PAGE_SIZE - 1; 2288 page = __get_free_page(GFP_TEMPORARY); 2289 kbuf = (char *) page; 2290 if (!kbuf) 2291 return -ENOMEM; 2292 if (copy_from_user(kbuf, buffer, left)) { 2293 err = -EFAULT; 2294 goto free; 2295 } 2296 kbuf[left] = 0; 2297 } 2298 2299 for (; left && vleft--; i++, first=0) { 2300 unsigned long lval; 2301 bool neg; 2302 2303 if (write) { 2304 left -= proc_skip_spaces(&kbuf); 2305 2306 if (!left) 2307 break; 2308 err = proc_get_long(&kbuf, &left, &lval, &neg, 2309 proc_wspace_sep, 2310 sizeof(proc_wspace_sep), NULL); 2311 if (err) 2312 break; 2313 if (conv(&neg, &lval, i, 1, data)) { 2314 err = -EINVAL; 2315 break; 2316 } 2317 } else { 2318 if (conv(&neg, &lval, i, 0, data)) { 2319 err = -EINVAL; 2320 break; 2321 } 2322 if (!first) 2323 err = proc_put_char(&buffer, &left, '\t'); 2324 if (err) 2325 break; 2326 err = proc_put_long(&buffer, &left, lval, neg); 2327 if (err) 2328 break; 2329 } 2330 } 2331 2332 if (!write && !first && left && !err) 2333 err = proc_put_char(&buffer, &left, '\n'); 2334 if (write && !err && left) 2335 left -= proc_skip_spaces(&kbuf); 2336 free: 2337 if (write) { 2338 free_page(page); 2339 if (first) 2340 return err ? : -EINVAL; 2341 } 2342 *lenp -= left; 2343 *ppos += *lenp; 2344 return err; 2345 } 2346 2347 static int do_proc_dointvec(struct ctl_table *table, int write, 2348 void __user *buffer, size_t *lenp, loff_t *ppos, 2349 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2350 int write, void *data), 2351 void *data) 2352 { 2353 return __do_proc_dointvec(table->data, table, write, 2354 buffer, lenp, ppos, conv, data); 2355 } 2356 2357 /** 2358 * proc_dointvec - read a vector of integers 2359 * @table: the sysctl table 2360 * @write: %TRUE if this is a write to the sysctl file 2361 * @buffer: the user buffer 2362 * @lenp: the size of the user buffer 2363 * @ppos: file position 2364 * 2365 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2366 * values from/to the user buffer, treated as an ASCII string. 2367 * 2368 * Returns 0 on success. 2369 */ 2370 int proc_dointvec(struct ctl_table *table, int write, 2371 void __user *buffer, size_t *lenp, loff_t *ppos) 2372 { 2373 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2374 NULL,NULL); 2375 } 2376 2377 /* 2378 * Taint values can only be increased 2379 * This means we can safely use a temporary. 2380 */ 2381 static int proc_taint(struct ctl_table *table, int write, 2382 void __user *buffer, size_t *lenp, loff_t *ppos) 2383 { 2384 struct ctl_table t; 2385 unsigned long tmptaint = get_taint(); 2386 int err; 2387 2388 if (write && !capable(CAP_SYS_ADMIN)) 2389 return -EPERM; 2390 2391 t = *table; 2392 t.data = &tmptaint; 2393 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2394 if (err < 0) 2395 return err; 2396 2397 if (write) { 2398 /* 2399 * Poor man's atomic or. Not worth adding a primitive 2400 * to everyone's atomic.h for this 2401 */ 2402 int i; 2403 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2404 if ((tmptaint >> i) & 1) 2405 add_taint(i); 2406 } 2407 } 2408 2409 return err; 2410 } 2411 2412 #ifdef CONFIG_PRINTK 2413 static int proc_dmesg_restrict(struct ctl_table *table, int write, 2414 void __user *buffer, size_t *lenp, loff_t *ppos) 2415 { 2416 if (write && !capable(CAP_SYS_ADMIN)) 2417 return -EPERM; 2418 2419 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2420 } 2421 #endif 2422 2423 struct do_proc_dointvec_minmax_conv_param { 2424 int *min; 2425 int *max; 2426 }; 2427 2428 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2429 int *valp, 2430 int write, void *data) 2431 { 2432 struct do_proc_dointvec_minmax_conv_param *param = data; 2433 if (write) { 2434 int val = *negp ? -*lvalp : *lvalp; 2435 if ((param->min && *param->min > val) || 2436 (param->max && *param->max < val)) 2437 return -EINVAL; 2438 *valp = val; 2439 } else { 2440 int val = *valp; 2441 if (val < 0) { 2442 *negp = true; 2443 *lvalp = (unsigned long)-val; 2444 } else { 2445 *negp = false; 2446 *lvalp = (unsigned long)val; 2447 } 2448 } 2449 return 0; 2450 } 2451 2452 /** 2453 * proc_dointvec_minmax - read a vector of integers with min/max values 2454 * @table: the sysctl table 2455 * @write: %TRUE if this is a write to the sysctl file 2456 * @buffer: the user buffer 2457 * @lenp: the size of the user buffer 2458 * @ppos: file position 2459 * 2460 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2461 * values from/to the user buffer, treated as an ASCII string. 2462 * 2463 * This routine will ensure the values are within the range specified by 2464 * table->extra1 (min) and table->extra2 (max). 2465 * 2466 * Returns 0 on success. 2467 */ 2468 int proc_dointvec_minmax(struct ctl_table *table, int write, 2469 void __user *buffer, size_t *lenp, loff_t *ppos) 2470 { 2471 struct do_proc_dointvec_minmax_conv_param param = { 2472 .min = (int *) table->extra1, 2473 .max = (int *) table->extra2, 2474 }; 2475 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2476 do_proc_dointvec_minmax_conv, ¶m); 2477 } 2478 2479 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2480 void __user *buffer, 2481 size_t *lenp, loff_t *ppos, 2482 unsigned long convmul, 2483 unsigned long convdiv) 2484 { 2485 unsigned long *i, *min, *max; 2486 int vleft, first = 1, err = 0; 2487 unsigned long page = 0; 2488 size_t left; 2489 char *kbuf; 2490 2491 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2492 *lenp = 0; 2493 return 0; 2494 } 2495 2496 i = (unsigned long *) data; 2497 min = (unsigned long *) table->extra1; 2498 max = (unsigned long *) table->extra2; 2499 vleft = table->maxlen / sizeof(unsigned long); 2500 left = *lenp; 2501 2502 if (write) { 2503 if (left > PAGE_SIZE - 1) 2504 left = PAGE_SIZE - 1; 2505 page = __get_free_page(GFP_TEMPORARY); 2506 kbuf = (char *) page; 2507 if (!kbuf) 2508 return -ENOMEM; 2509 if (copy_from_user(kbuf, buffer, left)) { 2510 err = -EFAULT; 2511 goto free; 2512 } 2513 kbuf[left] = 0; 2514 } 2515 2516 for (; left && vleft--; i++, first = 0) { 2517 unsigned long val; 2518 2519 if (write) { 2520 bool neg; 2521 2522 left -= proc_skip_spaces(&kbuf); 2523 2524 err = proc_get_long(&kbuf, &left, &val, &neg, 2525 proc_wspace_sep, 2526 sizeof(proc_wspace_sep), NULL); 2527 if (err) 2528 break; 2529 if (neg) 2530 continue; 2531 if ((min && val < *min) || (max && val > *max)) 2532 continue; 2533 *i = val; 2534 } else { 2535 val = convdiv * (*i) / convmul; 2536 if (!first) 2537 err = proc_put_char(&buffer, &left, '\t'); 2538 err = proc_put_long(&buffer, &left, val, false); 2539 if (err) 2540 break; 2541 } 2542 } 2543 2544 if (!write && !first && left && !err) 2545 err = proc_put_char(&buffer, &left, '\n'); 2546 if (write && !err) 2547 left -= proc_skip_spaces(&kbuf); 2548 free: 2549 if (write) { 2550 free_page(page); 2551 if (first) 2552 return err ? : -EINVAL; 2553 } 2554 *lenp -= left; 2555 *ppos += *lenp; 2556 return err; 2557 } 2558 2559 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2560 void __user *buffer, 2561 size_t *lenp, loff_t *ppos, 2562 unsigned long convmul, 2563 unsigned long convdiv) 2564 { 2565 return __do_proc_doulongvec_minmax(table->data, table, write, 2566 buffer, lenp, ppos, convmul, convdiv); 2567 } 2568 2569 /** 2570 * proc_doulongvec_minmax - read a vector of long integers 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. 2579 * 2580 * This routine will ensure the values are within the range specified by 2581 * table->extra1 (min) and table->extra2 (max). 2582 * 2583 * Returns 0 on success. 2584 */ 2585 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2586 void __user *buffer, size_t *lenp, loff_t *ppos) 2587 { 2588 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2589 } 2590 2591 /** 2592 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2593 * @table: the sysctl table 2594 * @write: %TRUE if this is a write to the sysctl file 2595 * @buffer: the user buffer 2596 * @lenp: the size of the user buffer 2597 * @ppos: file position 2598 * 2599 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2600 * values from/to the user buffer, treated as an ASCII string. The values 2601 * are treated as milliseconds, and converted to jiffies when they are stored. 2602 * 2603 * This routine will ensure the values are within the range specified by 2604 * table->extra1 (min) and table->extra2 (max). 2605 * 2606 * Returns 0 on success. 2607 */ 2608 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2609 void __user *buffer, 2610 size_t *lenp, loff_t *ppos) 2611 { 2612 return do_proc_doulongvec_minmax(table, write, buffer, 2613 lenp, ppos, HZ, 1000l); 2614 } 2615 2616 2617 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2618 int *valp, 2619 int write, void *data) 2620 { 2621 if (write) { 2622 if (*lvalp > LONG_MAX / HZ) 2623 return 1; 2624 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2625 } else { 2626 int val = *valp; 2627 unsigned long lval; 2628 if (val < 0) { 2629 *negp = true; 2630 lval = (unsigned long)-val; 2631 } else { 2632 *negp = false; 2633 lval = (unsigned long)val; 2634 } 2635 *lvalp = lval / HZ; 2636 } 2637 return 0; 2638 } 2639 2640 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2641 int *valp, 2642 int write, void *data) 2643 { 2644 if (write) { 2645 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2646 return 1; 2647 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2648 } else { 2649 int val = *valp; 2650 unsigned long lval; 2651 if (val < 0) { 2652 *negp = true; 2653 lval = (unsigned long)-val; 2654 } else { 2655 *negp = false; 2656 lval = (unsigned long)val; 2657 } 2658 *lvalp = jiffies_to_clock_t(lval); 2659 } 2660 return 0; 2661 } 2662 2663 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2664 int *valp, 2665 int write, void *data) 2666 { 2667 if (write) { 2668 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2669 } else { 2670 int val = *valp; 2671 unsigned long lval; 2672 if (val < 0) { 2673 *negp = true; 2674 lval = (unsigned long)-val; 2675 } else { 2676 *negp = false; 2677 lval = (unsigned long)val; 2678 } 2679 *lvalp = jiffies_to_msecs(lval); 2680 } 2681 return 0; 2682 } 2683 2684 /** 2685 * proc_dointvec_jiffies - read a vector of integers as 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: 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 seconds, and are converted into 2695 * jiffies. 2696 * 2697 * Returns 0 on success. 2698 */ 2699 int proc_dointvec_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_jiffies_conv,NULL); 2704 } 2705 2706 /** 2707 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 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: pointer to the file position 2713 * 2714 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2715 * values from/to the user buffer, treated as an ASCII string. 2716 * The values read are assumed to be in 1/USER_HZ seconds, and 2717 * are converted into jiffies. 2718 * 2719 * Returns 0 on success. 2720 */ 2721 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2722 void __user *buffer, size_t *lenp, loff_t *ppos) 2723 { 2724 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2725 do_proc_dointvec_userhz_jiffies_conv,NULL); 2726 } 2727 2728 /** 2729 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2730 * @table: the sysctl table 2731 * @write: %TRUE if this is a write to the sysctl file 2732 * @buffer: the user buffer 2733 * @lenp: the size of the user buffer 2734 * @ppos: file position 2735 * @ppos: the current position in the file 2736 * 2737 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2738 * values from/to the user buffer, treated as an ASCII string. 2739 * The values read are assumed to be in 1/1000 seconds, and 2740 * are converted into jiffies. 2741 * 2742 * Returns 0 on success. 2743 */ 2744 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2745 void __user *buffer, size_t *lenp, loff_t *ppos) 2746 { 2747 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2748 do_proc_dointvec_ms_jiffies_conv, NULL); 2749 } 2750 2751 static int proc_do_cad_pid(struct ctl_table *table, int write, 2752 void __user *buffer, size_t *lenp, loff_t *ppos) 2753 { 2754 struct pid *new_pid; 2755 pid_t tmp; 2756 int r; 2757 2758 tmp = pid_vnr(cad_pid); 2759 2760 r = __do_proc_dointvec(&tmp, table, write, buffer, 2761 lenp, ppos, NULL, NULL); 2762 if (r || !write) 2763 return r; 2764 2765 new_pid = find_get_pid(tmp); 2766 if (!new_pid) 2767 return -ESRCH; 2768 2769 put_pid(xchg(&cad_pid, new_pid)); 2770 return 0; 2771 } 2772 2773 /** 2774 * proc_do_large_bitmap - read/write from/to a large bitmap 2775 * @table: the sysctl table 2776 * @write: %TRUE if this is a write to the sysctl file 2777 * @buffer: the user buffer 2778 * @lenp: the size of the user buffer 2779 * @ppos: file position 2780 * 2781 * The bitmap is stored at table->data and the bitmap length (in bits) 2782 * in table->maxlen. 2783 * 2784 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2785 * large bitmaps may be represented in a compact manner. Writing into 2786 * the file will clear the bitmap then update it with the given input. 2787 * 2788 * Returns 0 on success. 2789 */ 2790 int proc_do_large_bitmap(struct ctl_table *table, int write, 2791 void __user *buffer, size_t *lenp, loff_t *ppos) 2792 { 2793 int err = 0; 2794 bool first = 1; 2795 size_t left = *lenp; 2796 unsigned long bitmap_len = table->maxlen; 2797 unsigned long *bitmap = (unsigned long *) table->data; 2798 unsigned long *tmp_bitmap = NULL; 2799 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2800 2801 if (!bitmap_len || !left || (*ppos && !write)) { 2802 *lenp = 0; 2803 return 0; 2804 } 2805 2806 if (write) { 2807 unsigned long page = 0; 2808 char *kbuf; 2809 2810 if (left > PAGE_SIZE - 1) 2811 left = PAGE_SIZE - 1; 2812 2813 page = __get_free_page(GFP_TEMPORARY); 2814 kbuf = (char *) page; 2815 if (!kbuf) 2816 return -ENOMEM; 2817 if (copy_from_user(kbuf, buffer, left)) { 2818 free_page(page); 2819 return -EFAULT; 2820 } 2821 kbuf[left] = 0; 2822 2823 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2824 GFP_KERNEL); 2825 if (!tmp_bitmap) { 2826 free_page(page); 2827 return -ENOMEM; 2828 } 2829 proc_skip_char(&kbuf, &left, '\n'); 2830 while (!err && left) { 2831 unsigned long val_a, val_b; 2832 bool neg; 2833 2834 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2835 sizeof(tr_a), &c); 2836 if (err) 2837 break; 2838 if (val_a >= bitmap_len || neg) { 2839 err = -EINVAL; 2840 break; 2841 } 2842 2843 val_b = val_a; 2844 if (left) { 2845 kbuf++; 2846 left--; 2847 } 2848 2849 if (c == '-') { 2850 err = proc_get_long(&kbuf, &left, &val_b, 2851 &neg, tr_b, sizeof(tr_b), 2852 &c); 2853 if (err) 2854 break; 2855 if (val_b >= bitmap_len || neg || 2856 val_a > val_b) { 2857 err = -EINVAL; 2858 break; 2859 } 2860 if (left) { 2861 kbuf++; 2862 left--; 2863 } 2864 } 2865 2866 while (val_a <= val_b) 2867 set_bit(val_a++, tmp_bitmap); 2868 2869 first = 0; 2870 proc_skip_char(&kbuf, &left, '\n'); 2871 } 2872 free_page(page); 2873 } else { 2874 unsigned long bit_a, bit_b = 0; 2875 2876 while (left) { 2877 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2878 if (bit_a >= bitmap_len) 2879 break; 2880 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2881 bit_a + 1) - 1; 2882 2883 if (!first) { 2884 err = proc_put_char(&buffer, &left, ','); 2885 if (err) 2886 break; 2887 } 2888 err = proc_put_long(&buffer, &left, bit_a, false); 2889 if (err) 2890 break; 2891 if (bit_a != bit_b) { 2892 err = proc_put_char(&buffer, &left, '-'); 2893 if (err) 2894 break; 2895 err = proc_put_long(&buffer, &left, bit_b, false); 2896 if (err) 2897 break; 2898 } 2899 2900 first = 0; bit_b++; 2901 } 2902 if (!err) 2903 err = proc_put_char(&buffer, &left, '\n'); 2904 } 2905 2906 if (!err) { 2907 if (write) { 2908 if (*ppos) 2909 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2910 else 2911 memcpy(bitmap, tmp_bitmap, 2912 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2913 } 2914 kfree(tmp_bitmap); 2915 *lenp -= left; 2916 *ppos += *lenp; 2917 return 0; 2918 } else { 2919 kfree(tmp_bitmap); 2920 return err; 2921 } 2922 } 2923 2924 #else /* CONFIG_PROC_SYSCTL */ 2925 2926 int proc_dostring(struct ctl_table *table, int write, 2927 void __user *buffer, size_t *lenp, loff_t *ppos) 2928 { 2929 return -ENOSYS; 2930 } 2931 2932 int proc_dointvec(struct ctl_table *table, int write, 2933 void __user *buffer, size_t *lenp, loff_t *ppos) 2934 { 2935 return -ENOSYS; 2936 } 2937 2938 int proc_dointvec_minmax(struct ctl_table *table, int write, 2939 void __user *buffer, size_t *lenp, loff_t *ppos) 2940 { 2941 return -ENOSYS; 2942 } 2943 2944 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2945 void __user *buffer, size_t *lenp, loff_t *ppos) 2946 { 2947 return -ENOSYS; 2948 } 2949 2950 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2951 void __user *buffer, size_t *lenp, loff_t *ppos) 2952 { 2953 return -ENOSYS; 2954 } 2955 2956 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2957 void __user *buffer, size_t *lenp, loff_t *ppos) 2958 { 2959 return -ENOSYS; 2960 } 2961 2962 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2963 void __user *buffer, size_t *lenp, loff_t *ppos) 2964 { 2965 return -ENOSYS; 2966 } 2967 2968 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2969 void __user *buffer, 2970 size_t *lenp, loff_t *ppos) 2971 { 2972 return -ENOSYS; 2973 } 2974 2975 2976 #endif /* CONFIG_PROC_SYSCTL */ 2977 2978 /* 2979 * No sense putting this after each symbol definition, twice, 2980 * exception granted :-) 2981 */ 2982 EXPORT_SYMBOL(proc_dointvec); 2983 EXPORT_SYMBOL(proc_dointvec_jiffies); 2984 EXPORT_SYMBOL(proc_dointvec_minmax); 2985 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2986 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2987 EXPORT_SYMBOL(proc_dostring); 2988 EXPORT_SYMBOL(proc_doulongvec_minmax); 2989 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2990 EXPORT_SYMBOL(register_sysctl_table); 2991 EXPORT_SYMBOL(register_sysctl_paths); 2992 EXPORT_SYMBOL(unregister_sysctl_table); 2993