1 /* 2 * sysctl.c: General linux system control interface 3 * 4 * Begun 24 March 1995, Stephen Tweedie 5 * Added /proc support, Dec 1995 6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. 7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. 8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. 9 * Dynamic registration fixes, Stephen Tweedie. 10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. 11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris 12 * Horn. 13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. 14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. 15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill 16 * Wendling. 17 * The list_for_each() macro wasn't appropriate for the sysctl loop. 18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling 19 */ 20 21 #include <linux/module.h> 22 #include <linux/mm.h> 23 #include <linux/swap.h> 24 #include <linux/slab.h> 25 #include <linux/sysctl.h> 26 #include <linux/signal.h> 27 #include <linux/printk.h> 28 #include <linux/proc_fs.h> 29 #include <linux/security.h> 30 #include <linux/ctype.h> 31 #include <linux/kmemcheck.h> 32 #include <linux/fs.h> 33 #include <linux/init.h> 34 #include <linux/kernel.h> 35 #include <linux/kobject.h> 36 #include <linux/net.h> 37 #include <linux/sysrq.h> 38 #include <linux/highuid.h> 39 #include <linux/writeback.h> 40 #include <linux/ratelimit.h> 41 #include <linux/compaction.h> 42 #include <linux/hugetlb.h> 43 #include <linux/initrd.h> 44 #include <linux/key.h> 45 #include <linux/times.h> 46 #include <linux/limits.h> 47 #include <linux/dcache.h> 48 #include <linux/dnotify.h> 49 #include <linux/syscalls.h> 50 #include <linux/vmstat.h> 51 #include <linux/nfs_fs.h> 52 #include <linux/acpi.h> 53 #include <linux/reboot.h> 54 #include <linux/ftrace.h> 55 #include <linux/perf_event.h> 56 #include <linux/kprobes.h> 57 #include <linux/pipe_fs_i.h> 58 #include <linux/oom.h> 59 60 #include <asm/uaccess.h> 61 #include <asm/processor.h> 62 63 #ifdef CONFIG_X86 64 #include <asm/nmi.h> 65 #include <asm/stacktrace.h> 66 #include <asm/io.h> 67 #endif 68 #ifdef CONFIG_BSD_PROCESS_ACCT 69 #include <linux/acct.h> 70 #endif 71 #ifdef CONFIG_RT_MUTEXES 72 #include <linux/rtmutex.h> 73 #endif 74 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 75 #include <linux/lockdep.h> 76 #endif 77 #ifdef CONFIG_CHR_DEV_SG 78 #include <scsi/sg.h> 79 #endif 80 81 #ifdef CONFIG_LOCKUP_DETECTOR 82 #include <linux/nmi.h> 83 #endif 84 85 86 #if defined(CONFIG_SYSCTL) 87 88 /* External variables not in a header file. */ 89 extern int sysctl_overcommit_memory; 90 extern int sysctl_overcommit_ratio; 91 extern int max_threads; 92 extern int core_uses_pid; 93 extern int suid_dumpable; 94 extern char core_pattern[]; 95 extern unsigned int core_pipe_limit; 96 extern int pid_max; 97 extern int min_free_kbytes; 98 extern int pid_max_min, pid_max_max; 99 extern int sysctl_drop_caches; 100 extern int percpu_pagelist_fraction; 101 extern int compat_log; 102 extern int latencytop_enabled; 103 extern int sysctl_nr_open_min, sysctl_nr_open_max; 104 #ifndef CONFIG_MMU 105 extern int sysctl_nr_trim_pages; 106 #endif 107 #ifdef CONFIG_BLOCK 108 extern int blk_iopoll_enabled; 109 #endif 110 111 /* Constants used for minimum and maximum */ 112 #ifdef CONFIG_LOCKUP_DETECTOR 113 static int sixty = 60; 114 static int neg_one = -1; 115 #endif 116 117 static int zero; 118 static int __maybe_unused one = 1; 119 static int __maybe_unused two = 2; 120 static unsigned long one_ul = 1; 121 static int one_hundred = 100; 122 #ifdef CONFIG_PRINTK 123 static int ten_thousand = 10000; 124 #endif 125 126 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 127 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 128 129 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 130 static int maxolduid = 65535; 131 static int minolduid; 132 static int min_percpu_pagelist_fract = 8; 133 134 static int ngroups_max = NGROUPS_MAX; 135 136 #ifdef CONFIG_INOTIFY_USER 137 #include <linux/inotify.h> 138 #endif 139 #ifdef CONFIG_SPARC 140 #include <asm/system.h> 141 #endif 142 143 #ifdef CONFIG_SPARC64 144 extern int sysctl_tsb_ratio; 145 #endif 146 147 #ifdef __hppa__ 148 extern int pwrsw_enabled; 149 extern int unaligned_enabled; 150 #endif 151 152 #ifdef CONFIG_S390 153 #ifdef CONFIG_MATHEMU 154 extern int sysctl_ieee_emulation_warnings; 155 #endif 156 extern int sysctl_userprocess_debug; 157 extern int spin_retry; 158 #endif 159 160 #ifdef CONFIG_IA64 161 extern int no_unaligned_warning; 162 extern int unaligned_dump_stack; 163 #endif 164 165 #ifdef CONFIG_PROC_SYSCTL 166 static int proc_do_cad_pid(struct ctl_table *table, int write, 167 void __user *buffer, size_t *lenp, loff_t *ppos); 168 static int proc_taint(struct ctl_table *table, int write, 169 void __user *buffer, size_t *lenp, loff_t *ppos); 170 #endif 171 172 #ifdef CONFIG_MAGIC_SYSRQ 173 /* Note: sysrq code uses it's own private copy */ 174 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 175 176 static int sysrq_sysctl_handler(ctl_table *table, int write, 177 void __user *buffer, size_t *lenp, 178 loff_t *ppos) 179 { 180 int error; 181 182 error = proc_dointvec(table, write, buffer, lenp, ppos); 183 if (error) 184 return error; 185 186 if (write) 187 sysrq_toggle_support(__sysrq_enabled); 188 189 return 0; 190 } 191 192 #endif 193 194 static struct ctl_table root_table[]; 195 static struct ctl_table_root sysctl_table_root; 196 static struct ctl_table_header root_table_header = { 197 {{.count = 1, 198 .ctl_table = root_table, 199 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, 200 .root = &sysctl_table_root, 201 .set = &sysctl_table_root.default_set, 202 }; 203 static struct ctl_table_root sysctl_table_root = { 204 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 205 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 206 }; 207 208 static struct ctl_table kern_table[]; 209 static struct ctl_table vm_table[]; 210 static struct ctl_table fs_table[]; 211 static struct ctl_table debug_table[]; 212 static struct ctl_table dev_table[]; 213 extern struct ctl_table random_table[]; 214 #ifdef CONFIG_EPOLL 215 extern struct ctl_table epoll_table[]; 216 #endif 217 218 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 219 int sysctl_legacy_va_layout; 220 #endif 221 222 /* The default sysctl tables: */ 223 224 static struct ctl_table root_table[] = { 225 { 226 .procname = "kernel", 227 .mode = 0555, 228 .child = kern_table, 229 }, 230 { 231 .procname = "vm", 232 .mode = 0555, 233 .child = vm_table, 234 }, 235 { 236 .procname = "fs", 237 .mode = 0555, 238 .child = fs_table, 239 }, 240 { 241 .procname = "debug", 242 .mode = 0555, 243 .child = debug_table, 244 }, 245 { 246 .procname = "dev", 247 .mode = 0555, 248 .child = dev_table, 249 }, 250 { } 251 }; 252 253 #ifdef CONFIG_SCHED_DEBUG 254 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 255 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 256 static int min_wakeup_granularity_ns; /* 0 usecs */ 257 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 258 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 259 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 260 #endif 261 262 #ifdef CONFIG_COMPACTION 263 static int min_extfrag_threshold; 264 static int max_extfrag_threshold = 1000; 265 #endif 266 267 static struct ctl_table kern_table[] = { 268 { 269 .procname = "sched_child_runs_first", 270 .data = &sysctl_sched_child_runs_first, 271 .maxlen = sizeof(unsigned int), 272 .mode = 0644, 273 .proc_handler = proc_dointvec, 274 }, 275 #ifdef CONFIG_SCHED_DEBUG 276 { 277 .procname = "sched_min_granularity_ns", 278 .data = &sysctl_sched_min_granularity, 279 .maxlen = sizeof(unsigned int), 280 .mode = 0644, 281 .proc_handler = sched_proc_update_handler, 282 .extra1 = &min_sched_granularity_ns, 283 .extra2 = &max_sched_granularity_ns, 284 }, 285 { 286 .procname = "sched_latency_ns", 287 .data = &sysctl_sched_latency, 288 .maxlen = sizeof(unsigned int), 289 .mode = 0644, 290 .proc_handler = sched_proc_update_handler, 291 .extra1 = &min_sched_granularity_ns, 292 .extra2 = &max_sched_granularity_ns, 293 }, 294 { 295 .procname = "sched_wakeup_granularity_ns", 296 .data = &sysctl_sched_wakeup_granularity, 297 .maxlen = sizeof(unsigned int), 298 .mode = 0644, 299 .proc_handler = sched_proc_update_handler, 300 .extra1 = &min_wakeup_granularity_ns, 301 .extra2 = &max_wakeup_granularity_ns, 302 }, 303 { 304 .procname = "sched_tunable_scaling", 305 .data = &sysctl_sched_tunable_scaling, 306 .maxlen = sizeof(enum sched_tunable_scaling), 307 .mode = 0644, 308 .proc_handler = sched_proc_update_handler, 309 .extra1 = &min_sched_tunable_scaling, 310 .extra2 = &max_sched_tunable_scaling, 311 }, 312 { 313 .procname = "sched_migration_cost", 314 .data = &sysctl_sched_migration_cost, 315 .maxlen = sizeof(unsigned int), 316 .mode = 0644, 317 .proc_handler = proc_dointvec, 318 }, 319 { 320 .procname = "sched_nr_migrate", 321 .data = &sysctl_sched_nr_migrate, 322 .maxlen = sizeof(unsigned int), 323 .mode = 0644, 324 .proc_handler = proc_dointvec, 325 }, 326 { 327 .procname = "sched_time_avg", 328 .data = &sysctl_sched_time_avg, 329 .maxlen = sizeof(unsigned int), 330 .mode = 0644, 331 .proc_handler = proc_dointvec, 332 }, 333 { 334 .procname = "sched_shares_window", 335 .data = &sysctl_sched_shares_window, 336 .maxlen = sizeof(unsigned int), 337 .mode = 0644, 338 .proc_handler = proc_dointvec, 339 }, 340 { 341 .procname = "timer_migration", 342 .data = &sysctl_timer_migration, 343 .maxlen = sizeof(unsigned int), 344 .mode = 0644, 345 .proc_handler = proc_dointvec_minmax, 346 .extra1 = &zero, 347 .extra2 = &one, 348 }, 349 #endif 350 { 351 .procname = "sched_rt_period_us", 352 .data = &sysctl_sched_rt_period, 353 .maxlen = sizeof(unsigned int), 354 .mode = 0644, 355 .proc_handler = sched_rt_handler, 356 }, 357 { 358 .procname = "sched_rt_runtime_us", 359 .data = &sysctl_sched_rt_runtime, 360 .maxlen = sizeof(int), 361 .mode = 0644, 362 .proc_handler = sched_rt_handler, 363 }, 364 #ifdef CONFIG_SCHED_AUTOGROUP 365 { 366 .procname = "sched_autogroup_enabled", 367 .data = &sysctl_sched_autogroup_enabled, 368 .maxlen = sizeof(unsigned int), 369 .mode = 0644, 370 .proc_handler = proc_dointvec_minmax, 371 .extra1 = &zero, 372 .extra2 = &one, 373 }, 374 #endif 375 #ifdef CONFIG_PROVE_LOCKING 376 { 377 .procname = "prove_locking", 378 .data = &prove_locking, 379 .maxlen = sizeof(int), 380 .mode = 0644, 381 .proc_handler = proc_dointvec, 382 }, 383 #endif 384 #ifdef CONFIG_LOCK_STAT 385 { 386 .procname = "lock_stat", 387 .data = &lock_stat, 388 .maxlen = sizeof(int), 389 .mode = 0644, 390 .proc_handler = proc_dointvec, 391 }, 392 #endif 393 { 394 .procname = "panic", 395 .data = &panic_timeout, 396 .maxlen = sizeof(int), 397 .mode = 0644, 398 .proc_handler = proc_dointvec, 399 }, 400 { 401 .procname = "core_uses_pid", 402 .data = &core_uses_pid, 403 .maxlen = sizeof(int), 404 .mode = 0644, 405 .proc_handler = proc_dointvec, 406 }, 407 { 408 .procname = "core_pattern", 409 .data = core_pattern, 410 .maxlen = CORENAME_MAX_SIZE, 411 .mode = 0644, 412 .proc_handler = proc_dostring, 413 }, 414 { 415 .procname = "core_pipe_limit", 416 .data = &core_pipe_limit, 417 .maxlen = sizeof(unsigned int), 418 .mode = 0644, 419 .proc_handler = proc_dointvec, 420 }, 421 #ifdef CONFIG_PROC_SYSCTL 422 { 423 .procname = "tainted", 424 .maxlen = sizeof(long), 425 .mode = 0644, 426 .proc_handler = proc_taint, 427 }, 428 #endif 429 #ifdef CONFIG_LATENCYTOP 430 { 431 .procname = "latencytop", 432 .data = &latencytop_enabled, 433 .maxlen = sizeof(int), 434 .mode = 0644, 435 .proc_handler = proc_dointvec, 436 }, 437 #endif 438 #ifdef CONFIG_BLK_DEV_INITRD 439 { 440 .procname = "real-root-dev", 441 .data = &real_root_dev, 442 .maxlen = sizeof(int), 443 .mode = 0644, 444 .proc_handler = proc_dointvec, 445 }, 446 #endif 447 { 448 .procname = "print-fatal-signals", 449 .data = &print_fatal_signals, 450 .maxlen = sizeof(int), 451 .mode = 0644, 452 .proc_handler = proc_dointvec, 453 }, 454 #ifdef CONFIG_SPARC 455 { 456 .procname = "reboot-cmd", 457 .data = reboot_command, 458 .maxlen = 256, 459 .mode = 0644, 460 .proc_handler = proc_dostring, 461 }, 462 { 463 .procname = "stop-a", 464 .data = &stop_a_enabled, 465 .maxlen = sizeof (int), 466 .mode = 0644, 467 .proc_handler = proc_dointvec, 468 }, 469 { 470 .procname = "scons-poweroff", 471 .data = &scons_pwroff, 472 .maxlen = sizeof (int), 473 .mode = 0644, 474 .proc_handler = proc_dointvec, 475 }, 476 #endif 477 #ifdef CONFIG_SPARC64 478 { 479 .procname = "tsb-ratio", 480 .data = &sysctl_tsb_ratio, 481 .maxlen = sizeof (int), 482 .mode = 0644, 483 .proc_handler = proc_dointvec, 484 }, 485 #endif 486 #ifdef __hppa__ 487 { 488 .procname = "soft-power", 489 .data = &pwrsw_enabled, 490 .maxlen = sizeof (int), 491 .mode = 0644, 492 .proc_handler = proc_dointvec, 493 }, 494 { 495 .procname = "unaligned-trap", 496 .data = &unaligned_enabled, 497 .maxlen = sizeof (int), 498 .mode = 0644, 499 .proc_handler = proc_dointvec, 500 }, 501 #endif 502 { 503 .procname = "ctrl-alt-del", 504 .data = &C_A_D, 505 .maxlen = sizeof(int), 506 .mode = 0644, 507 .proc_handler = proc_dointvec, 508 }, 509 #ifdef CONFIG_FUNCTION_TRACER 510 { 511 .procname = "ftrace_enabled", 512 .data = &ftrace_enabled, 513 .maxlen = sizeof(int), 514 .mode = 0644, 515 .proc_handler = ftrace_enable_sysctl, 516 }, 517 #endif 518 #ifdef CONFIG_STACK_TRACER 519 { 520 .procname = "stack_tracer_enabled", 521 .data = &stack_tracer_enabled, 522 .maxlen = sizeof(int), 523 .mode = 0644, 524 .proc_handler = stack_trace_sysctl, 525 }, 526 #endif 527 #ifdef CONFIG_TRACING 528 { 529 .procname = "ftrace_dump_on_oops", 530 .data = &ftrace_dump_on_oops, 531 .maxlen = sizeof(int), 532 .mode = 0644, 533 .proc_handler = proc_dointvec, 534 }, 535 #endif 536 #ifdef CONFIG_MODULES 537 { 538 .procname = "modprobe", 539 .data = &modprobe_path, 540 .maxlen = KMOD_PATH_LEN, 541 .mode = 0644, 542 .proc_handler = proc_dostring, 543 }, 544 { 545 .procname = "modules_disabled", 546 .data = &modules_disabled, 547 .maxlen = sizeof(int), 548 .mode = 0644, 549 /* only handle a transition from default "0" to "1" */ 550 .proc_handler = proc_dointvec_minmax, 551 .extra1 = &one, 552 .extra2 = &one, 553 }, 554 #endif 555 #ifdef CONFIG_HOTPLUG 556 { 557 .procname = "hotplug", 558 .data = &uevent_helper, 559 .maxlen = UEVENT_HELPER_PATH_LEN, 560 .mode = 0644, 561 .proc_handler = proc_dostring, 562 }, 563 #endif 564 #ifdef CONFIG_CHR_DEV_SG 565 { 566 .procname = "sg-big-buff", 567 .data = &sg_big_buff, 568 .maxlen = sizeof (int), 569 .mode = 0444, 570 .proc_handler = proc_dointvec, 571 }, 572 #endif 573 #ifdef CONFIG_BSD_PROCESS_ACCT 574 { 575 .procname = "acct", 576 .data = &acct_parm, 577 .maxlen = 3*sizeof(int), 578 .mode = 0644, 579 .proc_handler = proc_dointvec, 580 }, 581 #endif 582 #ifdef CONFIG_MAGIC_SYSRQ 583 { 584 .procname = "sysrq", 585 .data = &__sysrq_enabled, 586 .maxlen = sizeof (int), 587 .mode = 0644, 588 .proc_handler = sysrq_sysctl_handler, 589 }, 590 #endif 591 #ifdef CONFIG_PROC_SYSCTL 592 { 593 .procname = "cad_pid", 594 .data = NULL, 595 .maxlen = sizeof (int), 596 .mode = 0600, 597 .proc_handler = proc_do_cad_pid, 598 }, 599 #endif 600 { 601 .procname = "threads-max", 602 .data = &max_threads, 603 .maxlen = sizeof(int), 604 .mode = 0644, 605 .proc_handler = proc_dointvec, 606 }, 607 { 608 .procname = "random", 609 .mode = 0555, 610 .child = random_table, 611 }, 612 { 613 .procname = "overflowuid", 614 .data = &overflowuid, 615 .maxlen = sizeof(int), 616 .mode = 0644, 617 .proc_handler = proc_dointvec_minmax, 618 .extra1 = &minolduid, 619 .extra2 = &maxolduid, 620 }, 621 { 622 .procname = "overflowgid", 623 .data = &overflowgid, 624 .maxlen = sizeof(int), 625 .mode = 0644, 626 .proc_handler = proc_dointvec_minmax, 627 .extra1 = &minolduid, 628 .extra2 = &maxolduid, 629 }, 630 #ifdef CONFIG_S390 631 #ifdef CONFIG_MATHEMU 632 { 633 .procname = "ieee_emulation_warnings", 634 .data = &sysctl_ieee_emulation_warnings, 635 .maxlen = sizeof(int), 636 .mode = 0644, 637 .proc_handler = proc_dointvec, 638 }, 639 #endif 640 { 641 .procname = "userprocess_debug", 642 .data = &show_unhandled_signals, 643 .maxlen = sizeof(int), 644 .mode = 0644, 645 .proc_handler = proc_dointvec, 646 }, 647 #endif 648 { 649 .procname = "pid_max", 650 .data = &pid_max, 651 .maxlen = sizeof (int), 652 .mode = 0644, 653 .proc_handler = proc_dointvec_minmax, 654 .extra1 = &pid_max_min, 655 .extra2 = &pid_max_max, 656 }, 657 { 658 .procname = "panic_on_oops", 659 .data = &panic_on_oops, 660 .maxlen = sizeof(int), 661 .mode = 0644, 662 .proc_handler = proc_dointvec, 663 }, 664 #if defined CONFIG_PRINTK 665 { 666 .procname = "printk", 667 .data = &console_loglevel, 668 .maxlen = 4*sizeof(int), 669 .mode = 0644, 670 .proc_handler = proc_dointvec, 671 }, 672 { 673 .procname = "printk_ratelimit", 674 .data = &printk_ratelimit_state.interval, 675 .maxlen = sizeof(int), 676 .mode = 0644, 677 .proc_handler = proc_dointvec_jiffies, 678 }, 679 { 680 .procname = "printk_ratelimit_burst", 681 .data = &printk_ratelimit_state.burst, 682 .maxlen = sizeof(int), 683 .mode = 0644, 684 .proc_handler = proc_dointvec, 685 }, 686 { 687 .procname = "printk_delay", 688 .data = &printk_delay_msec, 689 .maxlen = sizeof(int), 690 .mode = 0644, 691 .proc_handler = proc_dointvec_minmax, 692 .extra1 = &zero, 693 .extra2 = &ten_thousand, 694 }, 695 { 696 .procname = "dmesg_restrict", 697 .data = &dmesg_restrict, 698 .maxlen = sizeof(int), 699 .mode = 0644, 700 .proc_handler = proc_dointvec_minmax, 701 .extra1 = &zero, 702 .extra2 = &one, 703 }, 704 { 705 .procname = "kptr_restrict", 706 .data = &kptr_restrict, 707 .maxlen = sizeof(int), 708 .mode = 0644, 709 .proc_handler = proc_dointvec_minmax, 710 .extra1 = &zero, 711 .extra2 = &two, 712 }, 713 #endif 714 { 715 .procname = "ngroups_max", 716 .data = &ngroups_max, 717 .maxlen = sizeof (int), 718 .mode = 0444, 719 .proc_handler = proc_dointvec, 720 }, 721 #if defined(CONFIG_LOCKUP_DETECTOR) 722 { 723 .procname = "watchdog", 724 .data = &watchdog_enabled, 725 .maxlen = sizeof (int), 726 .mode = 0644, 727 .proc_handler = proc_dowatchdog_enabled, 728 }, 729 { 730 .procname = "watchdog_thresh", 731 .data = &softlockup_thresh, 732 .maxlen = sizeof(int), 733 .mode = 0644, 734 .proc_handler = proc_dowatchdog_thresh, 735 .extra1 = &neg_one, 736 .extra2 = &sixty, 737 }, 738 { 739 .procname = "softlockup_panic", 740 .data = &softlockup_panic, 741 .maxlen = sizeof(int), 742 .mode = 0644, 743 .proc_handler = proc_dointvec_minmax, 744 .extra1 = &zero, 745 .extra2 = &one, 746 }, 747 { 748 .procname = "nmi_watchdog", 749 .data = &watchdog_enabled, 750 .maxlen = sizeof (int), 751 .mode = 0644, 752 .proc_handler = proc_dowatchdog_enabled, 753 }, 754 #endif 755 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 756 { 757 .procname = "unknown_nmi_panic", 758 .data = &unknown_nmi_panic, 759 .maxlen = sizeof (int), 760 .mode = 0644, 761 .proc_handler = proc_dointvec, 762 }, 763 #endif 764 #if defined(CONFIG_X86) 765 { 766 .procname = "panic_on_unrecovered_nmi", 767 .data = &panic_on_unrecovered_nmi, 768 .maxlen = sizeof(int), 769 .mode = 0644, 770 .proc_handler = proc_dointvec, 771 }, 772 { 773 .procname = "panic_on_io_nmi", 774 .data = &panic_on_io_nmi, 775 .maxlen = sizeof(int), 776 .mode = 0644, 777 .proc_handler = proc_dointvec, 778 }, 779 { 780 .procname = "bootloader_type", 781 .data = &bootloader_type, 782 .maxlen = sizeof (int), 783 .mode = 0444, 784 .proc_handler = proc_dointvec, 785 }, 786 { 787 .procname = "bootloader_version", 788 .data = &bootloader_version, 789 .maxlen = sizeof (int), 790 .mode = 0444, 791 .proc_handler = proc_dointvec, 792 }, 793 { 794 .procname = "kstack_depth_to_print", 795 .data = &kstack_depth_to_print, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec, 799 }, 800 { 801 .procname = "io_delay_type", 802 .data = &io_delay_type, 803 .maxlen = sizeof(int), 804 .mode = 0644, 805 .proc_handler = proc_dointvec, 806 }, 807 #endif 808 #if defined(CONFIG_MMU) 809 { 810 .procname = "randomize_va_space", 811 .data = &randomize_va_space, 812 .maxlen = sizeof(int), 813 .mode = 0644, 814 .proc_handler = proc_dointvec, 815 }, 816 #endif 817 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 818 { 819 .procname = "spin_retry", 820 .data = &spin_retry, 821 .maxlen = sizeof (int), 822 .mode = 0644, 823 .proc_handler = proc_dointvec, 824 }, 825 #endif 826 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 827 { 828 .procname = "acpi_video_flags", 829 .data = &acpi_realmode_flags, 830 .maxlen = sizeof (unsigned long), 831 .mode = 0644, 832 .proc_handler = proc_doulongvec_minmax, 833 }, 834 #endif 835 #ifdef CONFIG_IA64 836 { 837 .procname = "ignore-unaligned-usertrap", 838 .data = &no_unaligned_warning, 839 .maxlen = sizeof (int), 840 .mode = 0644, 841 .proc_handler = proc_dointvec, 842 }, 843 { 844 .procname = "unaligned-dump-stack", 845 .data = &unaligned_dump_stack, 846 .maxlen = sizeof (int), 847 .mode = 0644, 848 .proc_handler = proc_dointvec, 849 }, 850 #endif 851 #ifdef CONFIG_DETECT_HUNG_TASK 852 { 853 .procname = "hung_task_panic", 854 .data = &sysctl_hung_task_panic, 855 .maxlen = sizeof(int), 856 .mode = 0644, 857 .proc_handler = proc_dointvec_minmax, 858 .extra1 = &zero, 859 .extra2 = &one, 860 }, 861 { 862 .procname = "hung_task_check_count", 863 .data = &sysctl_hung_task_check_count, 864 .maxlen = sizeof(unsigned long), 865 .mode = 0644, 866 .proc_handler = proc_doulongvec_minmax, 867 }, 868 { 869 .procname = "hung_task_timeout_secs", 870 .data = &sysctl_hung_task_timeout_secs, 871 .maxlen = sizeof(unsigned long), 872 .mode = 0644, 873 .proc_handler = proc_dohung_task_timeout_secs, 874 }, 875 { 876 .procname = "hung_task_warnings", 877 .data = &sysctl_hung_task_warnings, 878 .maxlen = sizeof(unsigned long), 879 .mode = 0644, 880 .proc_handler = proc_doulongvec_minmax, 881 }, 882 #endif 883 #ifdef CONFIG_COMPAT 884 { 885 .procname = "compat-log", 886 .data = &compat_log, 887 .maxlen = sizeof (int), 888 .mode = 0644, 889 .proc_handler = proc_dointvec, 890 }, 891 #endif 892 #ifdef CONFIG_RT_MUTEXES 893 { 894 .procname = "max_lock_depth", 895 .data = &max_lock_depth, 896 .maxlen = sizeof(int), 897 .mode = 0644, 898 .proc_handler = proc_dointvec, 899 }, 900 #endif 901 { 902 .procname = "poweroff_cmd", 903 .data = &poweroff_cmd, 904 .maxlen = POWEROFF_CMD_PATH_LEN, 905 .mode = 0644, 906 .proc_handler = proc_dostring, 907 }, 908 #ifdef CONFIG_KEYS 909 { 910 .procname = "keys", 911 .mode = 0555, 912 .child = key_sysctls, 913 }, 914 #endif 915 #ifdef CONFIG_RCU_TORTURE_TEST 916 { 917 .procname = "rcutorture_runnable", 918 .data = &rcutorture_runnable, 919 .maxlen = sizeof(int), 920 .mode = 0644, 921 .proc_handler = proc_dointvec, 922 }, 923 #endif 924 #ifdef CONFIG_PERF_EVENTS 925 { 926 .procname = "perf_event_paranoid", 927 .data = &sysctl_perf_event_paranoid, 928 .maxlen = sizeof(sysctl_perf_event_paranoid), 929 .mode = 0644, 930 .proc_handler = proc_dointvec, 931 }, 932 { 933 .procname = "perf_event_mlock_kb", 934 .data = &sysctl_perf_event_mlock, 935 .maxlen = sizeof(sysctl_perf_event_mlock), 936 .mode = 0644, 937 .proc_handler = proc_dointvec, 938 }, 939 { 940 .procname = "perf_event_max_sample_rate", 941 .data = &sysctl_perf_event_sample_rate, 942 .maxlen = sizeof(sysctl_perf_event_sample_rate), 943 .mode = 0644, 944 .proc_handler = perf_proc_update_handler, 945 }, 946 #endif 947 #ifdef CONFIG_KMEMCHECK 948 { 949 .procname = "kmemcheck", 950 .data = &kmemcheck_enabled, 951 .maxlen = sizeof(int), 952 .mode = 0644, 953 .proc_handler = proc_dointvec, 954 }, 955 #endif 956 #ifdef CONFIG_BLOCK 957 { 958 .procname = "blk_iopoll", 959 .data = &blk_iopoll_enabled, 960 .maxlen = sizeof(int), 961 .mode = 0644, 962 .proc_handler = proc_dointvec, 963 }, 964 #endif 965 { } 966 }; 967 968 static struct ctl_table vm_table[] = { 969 { 970 .procname = "overcommit_memory", 971 .data = &sysctl_overcommit_memory, 972 .maxlen = sizeof(sysctl_overcommit_memory), 973 .mode = 0644, 974 .proc_handler = proc_dointvec, 975 }, 976 { 977 .procname = "panic_on_oom", 978 .data = &sysctl_panic_on_oom, 979 .maxlen = sizeof(sysctl_panic_on_oom), 980 .mode = 0644, 981 .proc_handler = proc_dointvec, 982 }, 983 { 984 .procname = "oom_kill_allocating_task", 985 .data = &sysctl_oom_kill_allocating_task, 986 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 987 .mode = 0644, 988 .proc_handler = proc_dointvec, 989 }, 990 { 991 .procname = "oom_dump_tasks", 992 .data = &sysctl_oom_dump_tasks, 993 .maxlen = sizeof(sysctl_oom_dump_tasks), 994 .mode = 0644, 995 .proc_handler = proc_dointvec, 996 }, 997 { 998 .procname = "overcommit_ratio", 999 .data = &sysctl_overcommit_ratio, 1000 .maxlen = sizeof(sysctl_overcommit_ratio), 1001 .mode = 0644, 1002 .proc_handler = proc_dointvec, 1003 }, 1004 { 1005 .procname = "page-cluster", 1006 .data = &page_cluster, 1007 .maxlen = sizeof(int), 1008 .mode = 0644, 1009 .proc_handler = proc_dointvec, 1010 }, 1011 { 1012 .procname = "dirty_background_ratio", 1013 .data = &dirty_background_ratio, 1014 .maxlen = sizeof(dirty_background_ratio), 1015 .mode = 0644, 1016 .proc_handler = dirty_background_ratio_handler, 1017 .extra1 = &zero, 1018 .extra2 = &one_hundred, 1019 }, 1020 { 1021 .procname = "dirty_background_bytes", 1022 .data = &dirty_background_bytes, 1023 .maxlen = sizeof(dirty_background_bytes), 1024 .mode = 0644, 1025 .proc_handler = dirty_background_bytes_handler, 1026 .extra1 = &one_ul, 1027 }, 1028 { 1029 .procname = "dirty_ratio", 1030 .data = &vm_dirty_ratio, 1031 .maxlen = sizeof(vm_dirty_ratio), 1032 .mode = 0644, 1033 .proc_handler = dirty_ratio_handler, 1034 .extra1 = &zero, 1035 .extra2 = &one_hundred, 1036 }, 1037 { 1038 .procname = "dirty_bytes", 1039 .data = &vm_dirty_bytes, 1040 .maxlen = sizeof(vm_dirty_bytes), 1041 .mode = 0644, 1042 .proc_handler = dirty_bytes_handler, 1043 .extra1 = &dirty_bytes_min, 1044 }, 1045 { 1046 .procname = "dirty_writeback_centisecs", 1047 .data = &dirty_writeback_interval, 1048 .maxlen = sizeof(dirty_writeback_interval), 1049 .mode = 0644, 1050 .proc_handler = dirty_writeback_centisecs_handler, 1051 }, 1052 { 1053 .procname = "dirty_expire_centisecs", 1054 .data = &dirty_expire_interval, 1055 .maxlen = sizeof(dirty_expire_interval), 1056 .mode = 0644, 1057 .proc_handler = proc_dointvec, 1058 }, 1059 { 1060 .procname = "nr_pdflush_threads", 1061 .data = &nr_pdflush_threads, 1062 .maxlen = sizeof nr_pdflush_threads, 1063 .mode = 0444 /* read-only*/, 1064 .proc_handler = proc_dointvec, 1065 }, 1066 { 1067 .procname = "swappiness", 1068 .data = &vm_swappiness, 1069 .maxlen = sizeof(vm_swappiness), 1070 .mode = 0644, 1071 .proc_handler = proc_dointvec_minmax, 1072 .extra1 = &zero, 1073 .extra2 = &one_hundred, 1074 }, 1075 #ifdef CONFIG_HUGETLB_PAGE 1076 { 1077 .procname = "nr_hugepages", 1078 .data = NULL, 1079 .maxlen = sizeof(unsigned long), 1080 .mode = 0644, 1081 .proc_handler = hugetlb_sysctl_handler, 1082 .extra1 = (void *)&hugetlb_zero, 1083 .extra2 = (void *)&hugetlb_infinity, 1084 }, 1085 #ifdef CONFIG_NUMA 1086 { 1087 .procname = "nr_hugepages_mempolicy", 1088 .data = NULL, 1089 .maxlen = sizeof(unsigned long), 1090 .mode = 0644, 1091 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1092 .extra1 = (void *)&hugetlb_zero, 1093 .extra2 = (void *)&hugetlb_infinity, 1094 }, 1095 #endif 1096 { 1097 .procname = "hugetlb_shm_group", 1098 .data = &sysctl_hugetlb_shm_group, 1099 .maxlen = sizeof(gid_t), 1100 .mode = 0644, 1101 .proc_handler = proc_dointvec, 1102 }, 1103 { 1104 .procname = "hugepages_treat_as_movable", 1105 .data = &hugepages_treat_as_movable, 1106 .maxlen = sizeof(int), 1107 .mode = 0644, 1108 .proc_handler = hugetlb_treat_movable_handler, 1109 }, 1110 { 1111 .procname = "nr_overcommit_hugepages", 1112 .data = NULL, 1113 .maxlen = sizeof(unsigned long), 1114 .mode = 0644, 1115 .proc_handler = hugetlb_overcommit_handler, 1116 .extra1 = (void *)&hugetlb_zero, 1117 .extra2 = (void *)&hugetlb_infinity, 1118 }, 1119 #endif 1120 { 1121 .procname = "lowmem_reserve_ratio", 1122 .data = &sysctl_lowmem_reserve_ratio, 1123 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1124 .mode = 0644, 1125 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1126 }, 1127 { 1128 .procname = "drop_caches", 1129 .data = &sysctl_drop_caches, 1130 .maxlen = sizeof(int), 1131 .mode = 0644, 1132 .proc_handler = drop_caches_sysctl_handler, 1133 }, 1134 #ifdef CONFIG_COMPACTION 1135 { 1136 .procname = "compact_memory", 1137 .data = &sysctl_compact_memory, 1138 .maxlen = sizeof(int), 1139 .mode = 0200, 1140 .proc_handler = sysctl_compaction_handler, 1141 }, 1142 { 1143 .procname = "extfrag_threshold", 1144 .data = &sysctl_extfrag_threshold, 1145 .maxlen = sizeof(int), 1146 .mode = 0644, 1147 .proc_handler = sysctl_extfrag_handler, 1148 .extra1 = &min_extfrag_threshold, 1149 .extra2 = &max_extfrag_threshold, 1150 }, 1151 1152 #endif /* CONFIG_COMPACTION */ 1153 { 1154 .procname = "min_free_kbytes", 1155 .data = &min_free_kbytes, 1156 .maxlen = sizeof(min_free_kbytes), 1157 .mode = 0644, 1158 .proc_handler = min_free_kbytes_sysctl_handler, 1159 .extra1 = &zero, 1160 }, 1161 { 1162 .procname = "percpu_pagelist_fraction", 1163 .data = &percpu_pagelist_fraction, 1164 .maxlen = sizeof(percpu_pagelist_fraction), 1165 .mode = 0644, 1166 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1167 .extra1 = &min_percpu_pagelist_fract, 1168 }, 1169 #ifdef CONFIG_MMU 1170 { 1171 .procname = "max_map_count", 1172 .data = &sysctl_max_map_count, 1173 .maxlen = sizeof(sysctl_max_map_count), 1174 .mode = 0644, 1175 .proc_handler = proc_dointvec_minmax, 1176 .extra1 = &zero, 1177 }, 1178 #else 1179 { 1180 .procname = "nr_trim_pages", 1181 .data = &sysctl_nr_trim_pages, 1182 .maxlen = sizeof(sysctl_nr_trim_pages), 1183 .mode = 0644, 1184 .proc_handler = proc_dointvec_minmax, 1185 .extra1 = &zero, 1186 }, 1187 #endif 1188 { 1189 .procname = "laptop_mode", 1190 .data = &laptop_mode, 1191 .maxlen = sizeof(laptop_mode), 1192 .mode = 0644, 1193 .proc_handler = proc_dointvec_jiffies, 1194 }, 1195 { 1196 .procname = "block_dump", 1197 .data = &block_dump, 1198 .maxlen = sizeof(block_dump), 1199 .mode = 0644, 1200 .proc_handler = proc_dointvec, 1201 .extra1 = &zero, 1202 }, 1203 { 1204 .procname = "vfs_cache_pressure", 1205 .data = &sysctl_vfs_cache_pressure, 1206 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1207 .mode = 0644, 1208 .proc_handler = proc_dointvec, 1209 .extra1 = &zero, 1210 }, 1211 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1212 { 1213 .procname = "legacy_va_layout", 1214 .data = &sysctl_legacy_va_layout, 1215 .maxlen = sizeof(sysctl_legacy_va_layout), 1216 .mode = 0644, 1217 .proc_handler = proc_dointvec, 1218 .extra1 = &zero, 1219 }, 1220 #endif 1221 #ifdef CONFIG_NUMA 1222 { 1223 .procname = "zone_reclaim_mode", 1224 .data = &zone_reclaim_mode, 1225 .maxlen = sizeof(zone_reclaim_mode), 1226 .mode = 0644, 1227 .proc_handler = proc_dointvec, 1228 .extra1 = &zero, 1229 }, 1230 { 1231 .procname = "min_unmapped_ratio", 1232 .data = &sysctl_min_unmapped_ratio, 1233 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1234 .mode = 0644, 1235 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1236 .extra1 = &zero, 1237 .extra2 = &one_hundred, 1238 }, 1239 { 1240 .procname = "min_slab_ratio", 1241 .data = &sysctl_min_slab_ratio, 1242 .maxlen = sizeof(sysctl_min_slab_ratio), 1243 .mode = 0644, 1244 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1245 .extra1 = &zero, 1246 .extra2 = &one_hundred, 1247 }, 1248 #endif 1249 #ifdef CONFIG_SMP 1250 { 1251 .procname = "stat_interval", 1252 .data = &sysctl_stat_interval, 1253 .maxlen = sizeof(sysctl_stat_interval), 1254 .mode = 0644, 1255 .proc_handler = proc_dointvec_jiffies, 1256 }, 1257 #endif 1258 #ifdef CONFIG_MMU 1259 { 1260 .procname = "mmap_min_addr", 1261 .data = &dac_mmap_min_addr, 1262 .maxlen = sizeof(unsigned long), 1263 .mode = 0644, 1264 .proc_handler = mmap_min_addr_handler, 1265 }, 1266 #endif 1267 #ifdef CONFIG_NUMA 1268 { 1269 .procname = "numa_zonelist_order", 1270 .data = &numa_zonelist_order, 1271 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1272 .mode = 0644, 1273 .proc_handler = numa_zonelist_order_handler, 1274 }, 1275 #endif 1276 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1277 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1278 { 1279 .procname = "vdso_enabled", 1280 .data = &vdso_enabled, 1281 .maxlen = sizeof(vdso_enabled), 1282 .mode = 0644, 1283 .proc_handler = proc_dointvec, 1284 .extra1 = &zero, 1285 }, 1286 #endif 1287 #ifdef CONFIG_HIGHMEM 1288 { 1289 .procname = "highmem_is_dirtyable", 1290 .data = &vm_highmem_is_dirtyable, 1291 .maxlen = sizeof(vm_highmem_is_dirtyable), 1292 .mode = 0644, 1293 .proc_handler = proc_dointvec_minmax, 1294 .extra1 = &zero, 1295 .extra2 = &one, 1296 }, 1297 #endif 1298 { 1299 .procname = "scan_unevictable_pages", 1300 .data = &scan_unevictable_pages, 1301 .maxlen = sizeof(scan_unevictable_pages), 1302 .mode = 0644, 1303 .proc_handler = scan_unevictable_handler, 1304 }, 1305 #ifdef CONFIG_MEMORY_FAILURE 1306 { 1307 .procname = "memory_failure_early_kill", 1308 .data = &sysctl_memory_failure_early_kill, 1309 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1310 .mode = 0644, 1311 .proc_handler = proc_dointvec_minmax, 1312 .extra1 = &zero, 1313 .extra2 = &one, 1314 }, 1315 { 1316 .procname = "memory_failure_recovery", 1317 .data = &sysctl_memory_failure_recovery, 1318 .maxlen = sizeof(sysctl_memory_failure_recovery), 1319 .mode = 0644, 1320 .proc_handler = proc_dointvec_minmax, 1321 .extra1 = &zero, 1322 .extra2 = &one, 1323 }, 1324 #endif 1325 { } 1326 }; 1327 1328 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1329 static struct ctl_table binfmt_misc_table[] = { 1330 { } 1331 }; 1332 #endif 1333 1334 static struct ctl_table fs_table[] = { 1335 { 1336 .procname = "inode-nr", 1337 .data = &inodes_stat, 1338 .maxlen = 2*sizeof(int), 1339 .mode = 0444, 1340 .proc_handler = proc_nr_inodes, 1341 }, 1342 { 1343 .procname = "inode-state", 1344 .data = &inodes_stat, 1345 .maxlen = 7*sizeof(int), 1346 .mode = 0444, 1347 .proc_handler = proc_nr_inodes, 1348 }, 1349 { 1350 .procname = "file-nr", 1351 .data = &files_stat, 1352 .maxlen = sizeof(files_stat), 1353 .mode = 0444, 1354 .proc_handler = proc_nr_files, 1355 }, 1356 { 1357 .procname = "file-max", 1358 .data = &files_stat.max_files, 1359 .maxlen = sizeof(files_stat.max_files), 1360 .mode = 0644, 1361 .proc_handler = proc_doulongvec_minmax, 1362 }, 1363 { 1364 .procname = "nr_open", 1365 .data = &sysctl_nr_open, 1366 .maxlen = sizeof(int), 1367 .mode = 0644, 1368 .proc_handler = proc_dointvec_minmax, 1369 .extra1 = &sysctl_nr_open_min, 1370 .extra2 = &sysctl_nr_open_max, 1371 }, 1372 { 1373 .procname = "dentry-state", 1374 .data = &dentry_stat, 1375 .maxlen = 6*sizeof(int), 1376 .mode = 0444, 1377 .proc_handler = proc_nr_dentry, 1378 }, 1379 { 1380 .procname = "overflowuid", 1381 .data = &fs_overflowuid, 1382 .maxlen = sizeof(int), 1383 .mode = 0644, 1384 .proc_handler = proc_dointvec_minmax, 1385 .extra1 = &minolduid, 1386 .extra2 = &maxolduid, 1387 }, 1388 { 1389 .procname = "overflowgid", 1390 .data = &fs_overflowgid, 1391 .maxlen = sizeof(int), 1392 .mode = 0644, 1393 .proc_handler = proc_dointvec_minmax, 1394 .extra1 = &minolduid, 1395 .extra2 = &maxolduid, 1396 }, 1397 #ifdef CONFIG_FILE_LOCKING 1398 { 1399 .procname = "leases-enable", 1400 .data = &leases_enable, 1401 .maxlen = sizeof(int), 1402 .mode = 0644, 1403 .proc_handler = proc_dointvec, 1404 }, 1405 #endif 1406 #ifdef CONFIG_DNOTIFY 1407 { 1408 .procname = "dir-notify-enable", 1409 .data = &dir_notify_enable, 1410 .maxlen = sizeof(int), 1411 .mode = 0644, 1412 .proc_handler = proc_dointvec, 1413 }, 1414 #endif 1415 #ifdef CONFIG_MMU 1416 #ifdef CONFIG_FILE_LOCKING 1417 { 1418 .procname = "lease-break-time", 1419 .data = &lease_break_time, 1420 .maxlen = sizeof(int), 1421 .mode = 0644, 1422 .proc_handler = proc_dointvec, 1423 }, 1424 #endif 1425 #ifdef CONFIG_AIO 1426 { 1427 .procname = "aio-nr", 1428 .data = &aio_nr, 1429 .maxlen = sizeof(aio_nr), 1430 .mode = 0444, 1431 .proc_handler = proc_doulongvec_minmax, 1432 }, 1433 { 1434 .procname = "aio-max-nr", 1435 .data = &aio_max_nr, 1436 .maxlen = sizeof(aio_max_nr), 1437 .mode = 0644, 1438 .proc_handler = proc_doulongvec_minmax, 1439 }, 1440 #endif /* CONFIG_AIO */ 1441 #ifdef CONFIG_INOTIFY_USER 1442 { 1443 .procname = "inotify", 1444 .mode = 0555, 1445 .child = inotify_table, 1446 }, 1447 #endif 1448 #ifdef CONFIG_EPOLL 1449 { 1450 .procname = "epoll", 1451 .mode = 0555, 1452 .child = epoll_table, 1453 }, 1454 #endif 1455 #endif 1456 { 1457 .procname = "suid_dumpable", 1458 .data = &suid_dumpable, 1459 .maxlen = sizeof(int), 1460 .mode = 0644, 1461 .proc_handler = proc_dointvec_minmax, 1462 .extra1 = &zero, 1463 .extra2 = &two, 1464 }, 1465 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1466 { 1467 .procname = "binfmt_misc", 1468 .mode = 0555, 1469 .child = binfmt_misc_table, 1470 }, 1471 #endif 1472 { 1473 .procname = "pipe-max-size", 1474 .data = &pipe_max_size, 1475 .maxlen = sizeof(int), 1476 .mode = 0644, 1477 .proc_handler = &pipe_proc_fn, 1478 .extra1 = &pipe_min_size, 1479 }, 1480 { } 1481 }; 1482 1483 static struct ctl_table debug_table[] = { 1484 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1485 defined(CONFIG_S390) 1486 { 1487 .procname = "exception-trace", 1488 .data = &show_unhandled_signals, 1489 .maxlen = sizeof(int), 1490 .mode = 0644, 1491 .proc_handler = proc_dointvec 1492 }, 1493 #endif 1494 #if defined(CONFIG_OPTPROBES) 1495 { 1496 .procname = "kprobes-optimization", 1497 .data = &sysctl_kprobes_optimization, 1498 .maxlen = sizeof(int), 1499 .mode = 0644, 1500 .proc_handler = proc_kprobes_optimization_handler, 1501 .extra1 = &zero, 1502 .extra2 = &one, 1503 }, 1504 #endif 1505 { } 1506 }; 1507 1508 static struct ctl_table dev_table[] = { 1509 { } 1510 }; 1511 1512 static DEFINE_SPINLOCK(sysctl_lock); 1513 1514 /* called under sysctl_lock */ 1515 static int use_table(struct ctl_table_header *p) 1516 { 1517 if (unlikely(p->unregistering)) 1518 return 0; 1519 p->used++; 1520 return 1; 1521 } 1522 1523 /* called under sysctl_lock */ 1524 static void unuse_table(struct ctl_table_header *p) 1525 { 1526 if (!--p->used) 1527 if (unlikely(p->unregistering)) 1528 complete(p->unregistering); 1529 } 1530 1531 /* called under sysctl_lock, will reacquire if has to wait */ 1532 static void start_unregistering(struct ctl_table_header *p) 1533 { 1534 /* 1535 * if p->used is 0, nobody will ever touch that entry again; 1536 * we'll eliminate all paths to it before dropping sysctl_lock 1537 */ 1538 if (unlikely(p->used)) { 1539 struct completion wait; 1540 init_completion(&wait); 1541 p->unregistering = &wait; 1542 spin_unlock(&sysctl_lock); 1543 wait_for_completion(&wait); 1544 spin_lock(&sysctl_lock); 1545 } else { 1546 /* anything non-NULL; we'll never dereference it */ 1547 p->unregistering = ERR_PTR(-EINVAL); 1548 } 1549 /* 1550 * do not remove from the list until nobody holds it; walking the 1551 * list in do_sysctl() relies on that. 1552 */ 1553 list_del_init(&p->ctl_entry); 1554 } 1555 1556 void sysctl_head_get(struct ctl_table_header *head) 1557 { 1558 spin_lock(&sysctl_lock); 1559 head->count++; 1560 spin_unlock(&sysctl_lock); 1561 } 1562 1563 static void free_head(struct rcu_head *rcu) 1564 { 1565 kfree(container_of(rcu, struct ctl_table_header, rcu)); 1566 } 1567 1568 void sysctl_head_put(struct ctl_table_header *head) 1569 { 1570 spin_lock(&sysctl_lock); 1571 if (!--head->count) 1572 call_rcu(&head->rcu, free_head); 1573 spin_unlock(&sysctl_lock); 1574 } 1575 1576 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1577 { 1578 if (!head) 1579 BUG(); 1580 spin_lock(&sysctl_lock); 1581 if (!use_table(head)) 1582 head = ERR_PTR(-ENOENT); 1583 spin_unlock(&sysctl_lock); 1584 return head; 1585 } 1586 1587 void sysctl_head_finish(struct ctl_table_header *head) 1588 { 1589 if (!head) 1590 return; 1591 spin_lock(&sysctl_lock); 1592 unuse_table(head); 1593 spin_unlock(&sysctl_lock); 1594 } 1595 1596 static struct ctl_table_set * 1597 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1598 { 1599 struct ctl_table_set *set = &root->default_set; 1600 if (root->lookup) 1601 set = root->lookup(root, namespaces); 1602 return set; 1603 } 1604 1605 static struct list_head * 1606 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1607 { 1608 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1609 return &set->list; 1610 } 1611 1612 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1613 struct ctl_table_header *prev) 1614 { 1615 struct ctl_table_root *root; 1616 struct list_head *header_list; 1617 struct ctl_table_header *head; 1618 struct list_head *tmp; 1619 1620 spin_lock(&sysctl_lock); 1621 if (prev) { 1622 head = prev; 1623 tmp = &prev->ctl_entry; 1624 unuse_table(prev); 1625 goto next; 1626 } 1627 tmp = &root_table_header.ctl_entry; 1628 for (;;) { 1629 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1630 1631 if (!use_table(head)) 1632 goto next; 1633 spin_unlock(&sysctl_lock); 1634 return head; 1635 next: 1636 root = head->root; 1637 tmp = tmp->next; 1638 header_list = lookup_header_list(root, namespaces); 1639 if (tmp != header_list) 1640 continue; 1641 1642 do { 1643 root = list_entry(root->root_list.next, 1644 struct ctl_table_root, root_list); 1645 if (root == &sysctl_table_root) 1646 goto out; 1647 header_list = lookup_header_list(root, namespaces); 1648 } while (list_empty(header_list)); 1649 tmp = header_list->next; 1650 } 1651 out: 1652 spin_unlock(&sysctl_lock); 1653 return NULL; 1654 } 1655 1656 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1657 { 1658 return __sysctl_head_next(current->nsproxy, prev); 1659 } 1660 1661 void register_sysctl_root(struct ctl_table_root *root) 1662 { 1663 spin_lock(&sysctl_lock); 1664 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1665 spin_unlock(&sysctl_lock); 1666 } 1667 1668 /* 1669 * sysctl_perm does NOT grant the superuser all rights automatically, because 1670 * some sysctl variables are readonly even to root. 1671 */ 1672 1673 static int test_perm(int mode, int op) 1674 { 1675 if (!current_euid()) 1676 mode >>= 6; 1677 else if (in_egroup_p(0)) 1678 mode >>= 3; 1679 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1680 return 0; 1681 return -EACCES; 1682 } 1683 1684 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1685 { 1686 int mode; 1687 1688 if (root->permissions) 1689 mode = root->permissions(root, current->nsproxy, table); 1690 else 1691 mode = table->mode; 1692 1693 return test_perm(mode, op); 1694 } 1695 1696 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1697 { 1698 for (; table->procname; table++) { 1699 table->parent = parent; 1700 if (table->child) 1701 sysctl_set_parent(table, table->child); 1702 } 1703 } 1704 1705 static __init int sysctl_init(void) 1706 { 1707 sysctl_set_parent(NULL, root_table); 1708 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1709 sysctl_check_table(current->nsproxy, root_table); 1710 #endif 1711 return 0; 1712 } 1713 1714 core_initcall(sysctl_init); 1715 1716 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1717 struct ctl_table *table) 1718 { 1719 struct ctl_table *p; 1720 const char *s = branch->procname; 1721 1722 /* branch should have named subdirectory as its first element */ 1723 if (!s || !branch->child) 1724 return NULL; 1725 1726 /* ... and nothing else */ 1727 if (branch[1].procname) 1728 return NULL; 1729 1730 /* table should contain subdirectory with the same name */ 1731 for (p = table; p->procname; p++) { 1732 if (!p->child) 1733 continue; 1734 if (p->procname && strcmp(p->procname, s) == 0) 1735 return p; 1736 } 1737 return NULL; 1738 } 1739 1740 /* see if attaching q to p would be an improvement */ 1741 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1742 { 1743 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1744 struct ctl_table *next; 1745 int is_better = 0; 1746 int not_in_parent = !p->attached_by; 1747 1748 while ((next = is_branch_in(by, to)) != NULL) { 1749 if (by == q->attached_by) 1750 is_better = 1; 1751 if (to == p->attached_by) 1752 not_in_parent = 1; 1753 by = by->child; 1754 to = next->child; 1755 } 1756 1757 if (is_better && not_in_parent) { 1758 q->attached_by = by; 1759 q->attached_to = to; 1760 q->parent = p; 1761 } 1762 } 1763 1764 /** 1765 * __register_sysctl_paths - register a sysctl hierarchy 1766 * @root: List of sysctl headers to register on 1767 * @namespaces: Data to compute which lists of sysctl entries are visible 1768 * @path: The path to the directory the sysctl table is in. 1769 * @table: the top-level table structure 1770 * 1771 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1772 * array. A completely 0 filled entry terminates the table. 1773 * 1774 * The members of the &struct ctl_table structure are used as follows: 1775 * 1776 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1777 * enter a sysctl file 1778 * 1779 * data - a pointer to data for use by proc_handler 1780 * 1781 * maxlen - the maximum size in bytes of the data 1782 * 1783 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1784 * 1785 * child - a pointer to the child sysctl table if this entry is a directory, or 1786 * %NULL. 1787 * 1788 * proc_handler - the text handler routine (described below) 1789 * 1790 * de - for internal use by the sysctl routines 1791 * 1792 * extra1, extra2 - extra pointers usable by the proc handler routines 1793 * 1794 * Leaf nodes in the sysctl tree will be represented by a single file 1795 * under /proc; non-leaf nodes will be represented by directories. 1796 * 1797 * sysctl(2) can automatically manage read and write requests through 1798 * the sysctl table. The data and maxlen fields of the ctl_table 1799 * struct enable minimal validation of the values being written to be 1800 * performed, and the mode field allows minimal authentication. 1801 * 1802 * There must be a proc_handler routine for any terminal nodes 1803 * mirrored under /proc/sys (non-terminals are handled by a built-in 1804 * directory handler). Several default handlers are available to 1805 * cover common cases - 1806 * 1807 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1808 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1809 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1810 * 1811 * It is the handler's job to read the input buffer from user memory 1812 * and process it. The handler should return 0 on success. 1813 * 1814 * This routine returns %NULL on a failure to register, and a pointer 1815 * to the table header on success. 1816 */ 1817 struct ctl_table_header *__register_sysctl_paths( 1818 struct ctl_table_root *root, 1819 struct nsproxy *namespaces, 1820 const struct ctl_path *path, struct ctl_table *table) 1821 { 1822 struct ctl_table_header *header; 1823 struct ctl_table *new, **prevp; 1824 unsigned int n, npath; 1825 struct ctl_table_set *set; 1826 1827 /* Count the path components */ 1828 for (npath = 0; path[npath].procname; ++npath) 1829 ; 1830 1831 /* 1832 * For each path component, allocate a 2-element ctl_table array. 1833 * The first array element will be filled with the sysctl entry 1834 * for this, the second will be the sentinel (procname == 0). 1835 * 1836 * We allocate everything in one go so that we don't have to 1837 * worry about freeing additional memory in unregister_sysctl_table. 1838 */ 1839 header = kzalloc(sizeof(struct ctl_table_header) + 1840 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1841 if (!header) 1842 return NULL; 1843 1844 new = (struct ctl_table *) (header + 1); 1845 1846 /* Now connect the dots */ 1847 prevp = &header->ctl_table; 1848 for (n = 0; n < npath; ++n, ++path) { 1849 /* Copy the procname */ 1850 new->procname = path->procname; 1851 new->mode = 0555; 1852 1853 *prevp = new; 1854 prevp = &new->child; 1855 1856 new += 2; 1857 } 1858 *prevp = table; 1859 header->ctl_table_arg = table; 1860 1861 INIT_LIST_HEAD(&header->ctl_entry); 1862 header->used = 0; 1863 header->unregistering = NULL; 1864 header->root = root; 1865 sysctl_set_parent(NULL, header->ctl_table); 1866 header->count = 1; 1867 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1868 if (sysctl_check_table(namespaces, header->ctl_table)) { 1869 kfree(header); 1870 return NULL; 1871 } 1872 #endif 1873 spin_lock(&sysctl_lock); 1874 header->set = lookup_header_set(root, namespaces); 1875 header->attached_by = header->ctl_table; 1876 header->attached_to = root_table; 1877 header->parent = &root_table_header; 1878 for (set = header->set; set; set = set->parent) { 1879 struct ctl_table_header *p; 1880 list_for_each_entry(p, &set->list, ctl_entry) { 1881 if (p->unregistering) 1882 continue; 1883 try_attach(p, header); 1884 } 1885 } 1886 header->parent->count++; 1887 list_add_tail(&header->ctl_entry, &header->set->list); 1888 spin_unlock(&sysctl_lock); 1889 1890 return header; 1891 } 1892 1893 /** 1894 * register_sysctl_table_path - register a sysctl table hierarchy 1895 * @path: The path to the directory the sysctl table is in. 1896 * @table: the top-level table structure 1897 * 1898 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1899 * array. A completely 0 filled entry terminates the table. 1900 * 1901 * See __register_sysctl_paths for more details. 1902 */ 1903 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1904 struct ctl_table *table) 1905 { 1906 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1907 path, table); 1908 } 1909 1910 /** 1911 * register_sysctl_table - register a sysctl table hierarchy 1912 * @table: the top-level table structure 1913 * 1914 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1915 * array. A completely 0 filled entry terminates the table. 1916 * 1917 * See register_sysctl_paths for more details. 1918 */ 1919 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1920 { 1921 static const struct ctl_path null_path[] = { {} }; 1922 1923 return register_sysctl_paths(null_path, table); 1924 } 1925 1926 /** 1927 * unregister_sysctl_table - unregister a sysctl table hierarchy 1928 * @header: the header returned from register_sysctl_table 1929 * 1930 * Unregisters the sysctl table and all children. proc entries may not 1931 * actually be removed until they are no longer used by anyone. 1932 */ 1933 void unregister_sysctl_table(struct ctl_table_header * header) 1934 { 1935 might_sleep(); 1936 1937 if (header == NULL) 1938 return; 1939 1940 spin_lock(&sysctl_lock); 1941 start_unregistering(header); 1942 if (!--header->parent->count) { 1943 WARN_ON(1); 1944 call_rcu(&header->parent->rcu, free_head); 1945 } 1946 if (!--header->count) 1947 call_rcu(&header->rcu, free_head); 1948 spin_unlock(&sysctl_lock); 1949 } 1950 1951 int sysctl_is_seen(struct ctl_table_header *p) 1952 { 1953 struct ctl_table_set *set = p->set; 1954 int res; 1955 spin_lock(&sysctl_lock); 1956 if (p->unregistering) 1957 res = 0; 1958 else if (!set->is_seen) 1959 res = 1; 1960 else 1961 res = set->is_seen(set); 1962 spin_unlock(&sysctl_lock); 1963 return res; 1964 } 1965 1966 void setup_sysctl_set(struct ctl_table_set *p, 1967 struct ctl_table_set *parent, 1968 int (*is_seen)(struct ctl_table_set *)) 1969 { 1970 INIT_LIST_HEAD(&p->list); 1971 p->parent = parent ? parent : &sysctl_table_root.default_set; 1972 p->is_seen = is_seen; 1973 } 1974 1975 #else /* !CONFIG_SYSCTL */ 1976 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1977 { 1978 return NULL; 1979 } 1980 1981 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1982 struct ctl_table *table) 1983 { 1984 return NULL; 1985 } 1986 1987 void unregister_sysctl_table(struct ctl_table_header * table) 1988 { 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 } 1996 1997 void sysctl_head_put(struct ctl_table_header *head) 1998 { 1999 } 2000 2001 #endif /* CONFIG_SYSCTL */ 2002 2003 /* 2004 * /proc/sys support 2005 */ 2006 2007 #ifdef CONFIG_PROC_SYSCTL 2008 2009 static int _proc_do_string(void* data, int maxlen, int write, 2010 void __user *buffer, 2011 size_t *lenp, loff_t *ppos) 2012 { 2013 size_t len; 2014 char __user *p; 2015 char c; 2016 2017 if (!data || !maxlen || !*lenp) { 2018 *lenp = 0; 2019 return 0; 2020 } 2021 2022 if (write) { 2023 len = 0; 2024 p = buffer; 2025 while (len < *lenp) { 2026 if (get_user(c, p++)) 2027 return -EFAULT; 2028 if (c == 0 || c == '\n') 2029 break; 2030 len++; 2031 } 2032 if (len >= maxlen) 2033 len = maxlen-1; 2034 if(copy_from_user(data, buffer, len)) 2035 return -EFAULT; 2036 ((char *) data)[len] = 0; 2037 *ppos += *lenp; 2038 } else { 2039 len = strlen(data); 2040 if (len > maxlen) 2041 len = maxlen; 2042 2043 if (*ppos > len) { 2044 *lenp = 0; 2045 return 0; 2046 } 2047 2048 data += *ppos; 2049 len -= *ppos; 2050 2051 if (len > *lenp) 2052 len = *lenp; 2053 if (len) 2054 if(copy_to_user(buffer, data, len)) 2055 return -EFAULT; 2056 if (len < *lenp) { 2057 if(put_user('\n', ((char __user *) buffer) + len)) 2058 return -EFAULT; 2059 len++; 2060 } 2061 *lenp = len; 2062 *ppos += len; 2063 } 2064 return 0; 2065 } 2066 2067 /** 2068 * proc_dostring - read a string sysctl 2069 * @table: the sysctl table 2070 * @write: %TRUE if this is a write to the sysctl file 2071 * @buffer: the user buffer 2072 * @lenp: the size of the user buffer 2073 * @ppos: file position 2074 * 2075 * Reads/writes a string from/to the user buffer. If the kernel 2076 * buffer provided is not large enough to hold the string, the 2077 * string is truncated. The copied string is %NULL-terminated. 2078 * If the string is being read by the user process, it is copied 2079 * and a newline '\n' is added. It is truncated if the buffer is 2080 * not large enough. 2081 * 2082 * Returns 0 on success. 2083 */ 2084 int proc_dostring(struct ctl_table *table, int write, 2085 void __user *buffer, size_t *lenp, loff_t *ppos) 2086 { 2087 return _proc_do_string(table->data, table->maxlen, write, 2088 buffer, lenp, ppos); 2089 } 2090 2091 static size_t proc_skip_spaces(char **buf) 2092 { 2093 size_t ret; 2094 char *tmp = skip_spaces(*buf); 2095 ret = tmp - *buf; 2096 *buf = tmp; 2097 return ret; 2098 } 2099 2100 static void proc_skip_char(char **buf, size_t *size, const char v) 2101 { 2102 while (*size) { 2103 if (**buf != v) 2104 break; 2105 (*size)--; 2106 (*buf)++; 2107 } 2108 } 2109 2110 #define TMPBUFLEN 22 2111 /** 2112 * proc_get_long - reads an ASCII formatted integer from a user buffer 2113 * 2114 * @buf: a kernel buffer 2115 * @size: size of the kernel buffer 2116 * @val: this is where the number will be stored 2117 * @neg: set to %TRUE if number is negative 2118 * @perm_tr: a vector which contains the allowed trailers 2119 * @perm_tr_len: size of the perm_tr vector 2120 * @tr: pointer to store the trailer character 2121 * 2122 * In case of success %0 is returned and @buf and @size are updated with 2123 * the amount of bytes read. If @tr is non-NULL and a trailing 2124 * character exists (size is non-zero after returning from this 2125 * function), @tr is updated with the trailing character. 2126 */ 2127 static int proc_get_long(char **buf, size_t *size, 2128 unsigned long *val, bool *neg, 2129 const char *perm_tr, unsigned perm_tr_len, char *tr) 2130 { 2131 int len; 2132 char *p, tmp[TMPBUFLEN]; 2133 2134 if (!*size) 2135 return -EINVAL; 2136 2137 len = *size; 2138 if (len > TMPBUFLEN - 1) 2139 len = TMPBUFLEN - 1; 2140 2141 memcpy(tmp, *buf, len); 2142 2143 tmp[len] = 0; 2144 p = tmp; 2145 if (*p == '-' && *size > 1) { 2146 *neg = true; 2147 p++; 2148 } else 2149 *neg = false; 2150 if (!isdigit(*p)) 2151 return -EINVAL; 2152 2153 *val = simple_strtoul(p, &p, 0); 2154 2155 len = p - tmp; 2156 2157 /* We don't know if the next char is whitespace thus we may accept 2158 * invalid integers (e.g. 1234...a) or two integers instead of one 2159 * (e.g. 123...1). So lets not allow such large numbers. */ 2160 if (len == TMPBUFLEN - 1) 2161 return -EINVAL; 2162 2163 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2164 return -EINVAL; 2165 2166 if (tr && (len < *size)) 2167 *tr = *p; 2168 2169 *buf += len; 2170 *size -= len; 2171 2172 return 0; 2173 } 2174 2175 /** 2176 * proc_put_long - converts an integer to a decimal ASCII formatted string 2177 * 2178 * @buf: the user buffer 2179 * @size: the size of the user buffer 2180 * @val: the integer to be converted 2181 * @neg: sign of the number, %TRUE for negative 2182 * 2183 * In case of success %0 is returned and @buf and @size are updated with 2184 * the amount of bytes written. 2185 */ 2186 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2187 bool neg) 2188 { 2189 int len; 2190 char tmp[TMPBUFLEN], *p = tmp; 2191 2192 sprintf(p, "%s%lu", neg ? "-" : "", val); 2193 len = strlen(tmp); 2194 if (len > *size) 2195 len = *size; 2196 if (copy_to_user(*buf, tmp, len)) 2197 return -EFAULT; 2198 *size -= len; 2199 *buf += len; 2200 return 0; 2201 } 2202 #undef TMPBUFLEN 2203 2204 static int proc_put_char(void __user **buf, size_t *size, char c) 2205 { 2206 if (*size) { 2207 char __user **buffer = (char __user **)buf; 2208 if (put_user(c, *buffer)) 2209 return -EFAULT; 2210 (*size)--, (*buffer)++; 2211 *buf = *buffer; 2212 } 2213 return 0; 2214 } 2215 2216 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2217 int *valp, 2218 int write, void *data) 2219 { 2220 if (write) { 2221 *valp = *negp ? -*lvalp : *lvalp; 2222 } else { 2223 int val = *valp; 2224 if (val < 0) { 2225 *negp = true; 2226 *lvalp = (unsigned long)-val; 2227 } else { 2228 *negp = false; 2229 *lvalp = (unsigned long)val; 2230 } 2231 } 2232 return 0; 2233 } 2234 2235 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2236 2237 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2238 int write, void __user *buffer, 2239 size_t *lenp, loff_t *ppos, 2240 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2241 int write, void *data), 2242 void *data) 2243 { 2244 int *i, vleft, first = 1, err = 0; 2245 unsigned long page = 0; 2246 size_t left; 2247 char *kbuf; 2248 2249 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2250 *lenp = 0; 2251 return 0; 2252 } 2253 2254 i = (int *) tbl_data; 2255 vleft = table->maxlen / sizeof(*i); 2256 left = *lenp; 2257 2258 if (!conv) 2259 conv = do_proc_dointvec_conv; 2260 2261 if (write) { 2262 if (left > PAGE_SIZE - 1) 2263 left = PAGE_SIZE - 1; 2264 page = __get_free_page(GFP_TEMPORARY); 2265 kbuf = (char *) page; 2266 if (!kbuf) 2267 return -ENOMEM; 2268 if (copy_from_user(kbuf, buffer, left)) { 2269 err = -EFAULT; 2270 goto free; 2271 } 2272 kbuf[left] = 0; 2273 } 2274 2275 for (; left && vleft--; i++, first=0) { 2276 unsigned long lval; 2277 bool neg; 2278 2279 if (write) { 2280 left -= proc_skip_spaces(&kbuf); 2281 2282 if (!left) 2283 break; 2284 err = proc_get_long(&kbuf, &left, &lval, &neg, 2285 proc_wspace_sep, 2286 sizeof(proc_wspace_sep), NULL); 2287 if (err) 2288 break; 2289 if (conv(&neg, &lval, i, 1, data)) { 2290 err = -EINVAL; 2291 break; 2292 } 2293 } else { 2294 if (conv(&neg, &lval, i, 0, data)) { 2295 err = -EINVAL; 2296 break; 2297 } 2298 if (!first) 2299 err = proc_put_char(&buffer, &left, '\t'); 2300 if (err) 2301 break; 2302 err = proc_put_long(&buffer, &left, lval, neg); 2303 if (err) 2304 break; 2305 } 2306 } 2307 2308 if (!write && !first && left && !err) 2309 err = proc_put_char(&buffer, &left, '\n'); 2310 if (write && !err && left) 2311 left -= proc_skip_spaces(&kbuf); 2312 free: 2313 if (write) { 2314 free_page(page); 2315 if (first) 2316 return err ? : -EINVAL; 2317 } 2318 *lenp -= left; 2319 *ppos += *lenp; 2320 return err; 2321 } 2322 2323 static int do_proc_dointvec(struct ctl_table *table, int write, 2324 void __user *buffer, size_t *lenp, loff_t *ppos, 2325 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2326 int write, void *data), 2327 void *data) 2328 { 2329 return __do_proc_dointvec(table->data, table, write, 2330 buffer, lenp, ppos, conv, data); 2331 } 2332 2333 /** 2334 * proc_dointvec - read a vector of integers 2335 * @table: the sysctl table 2336 * @write: %TRUE if this is a write to the sysctl file 2337 * @buffer: the user buffer 2338 * @lenp: the size of the user buffer 2339 * @ppos: file position 2340 * 2341 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2342 * values from/to the user buffer, treated as an ASCII string. 2343 * 2344 * Returns 0 on success. 2345 */ 2346 int proc_dointvec(struct ctl_table *table, int write, 2347 void __user *buffer, size_t *lenp, loff_t *ppos) 2348 { 2349 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2350 NULL,NULL); 2351 } 2352 2353 /* 2354 * Taint values can only be increased 2355 * This means we can safely use a temporary. 2356 */ 2357 static int proc_taint(struct ctl_table *table, int write, 2358 void __user *buffer, size_t *lenp, loff_t *ppos) 2359 { 2360 struct ctl_table t; 2361 unsigned long tmptaint = get_taint(); 2362 int err; 2363 2364 if (write && !capable(CAP_SYS_ADMIN)) 2365 return -EPERM; 2366 2367 t = *table; 2368 t.data = &tmptaint; 2369 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2370 if (err < 0) 2371 return err; 2372 2373 if (write) { 2374 /* 2375 * Poor man's atomic or. Not worth adding a primitive 2376 * to everyone's atomic.h for this 2377 */ 2378 int i; 2379 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2380 if ((tmptaint >> i) & 1) 2381 add_taint(i); 2382 } 2383 } 2384 2385 return err; 2386 } 2387 2388 struct do_proc_dointvec_minmax_conv_param { 2389 int *min; 2390 int *max; 2391 }; 2392 2393 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2394 int *valp, 2395 int write, void *data) 2396 { 2397 struct do_proc_dointvec_minmax_conv_param *param = data; 2398 if (write) { 2399 int val = *negp ? -*lvalp : *lvalp; 2400 if ((param->min && *param->min > val) || 2401 (param->max && *param->max < val)) 2402 return -EINVAL; 2403 *valp = val; 2404 } else { 2405 int val = *valp; 2406 if (val < 0) { 2407 *negp = true; 2408 *lvalp = (unsigned long)-val; 2409 } else { 2410 *negp = false; 2411 *lvalp = (unsigned long)val; 2412 } 2413 } 2414 return 0; 2415 } 2416 2417 /** 2418 * proc_dointvec_minmax - read a vector of integers with min/max values 2419 * @table: the sysctl table 2420 * @write: %TRUE if this is a write to the sysctl file 2421 * @buffer: the user buffer 2422 * @lenp: the size of the user buffer 2423 * @ppos: file position 2424 * 2425 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2426 * values from/to the user buffer, treated as an ASCII string. 2427 * 2428 * This routine will ensure the values are within the range specified by 2429 * table->extra1 (min) and table->extra2 (max). 2430 * 2431 * Returns 0 on success. 2432 */ 2433 int proc_dointvec_minmax(struct ctl_table *table, int write, 2434 void __user *buffer, size_t *lenp, loff_t *ppos) 2435 { 2436 struct do_proc_dointvec_minmax_conv_param param = { 2437 .min = (int *) table->extra1, 2438 .max = (int *) table->extra2, 2439 }; 2440 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2441 do_proc_dointvec_minmax_conv, ¶m); 2442 } 2443 2444 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2445 void __user *buffer, 2446 size_t *lenp, loff_t *ppos, 2447 unsigned long convmul, 2448 unsigned long convdiv) 2449 { 2450 unsigned long *i, *min, *max; 2451 int vleft, first = 1, err = 0; 2452 unsigned long page = 0; 2453 size_t left; 2454 char *kbuf; 2455 2456 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2457 *lenp = 0; 2458 return 0; 2459 } 2460 2461 i = (unsigned long *) data; 2462 min = (unsigned long *) table->extra1; 2463 max = (unsigned long *) table->extra2; 2464 vleft = table->maxlen / sizeof(unsigned long); 2465 left = *lenp; 2466 2467 if (write) { 2468 if (left > PAGE_SIZE - 1) 2469 left = PAGE_SIZE - 1; 2470 page = __get_free_page(GFP_TEMPORARY); 2471 kbuf = (char *) page; 2472 if (!kbuf) 2473 return -ENOMEM; 2474 if (copy_from_user(kbuf, buffer, left)) { 2475 err = -EFAULT; 2476 goto free; 2477 } 2478 kbuf[left] = 0; 2479 } 2480 2481 for (; left && vleft--; i++, first = 0) { 2482 unsigned long val; 2483 2484 if (write) { 2485 bool neg; 2486 2487 left -= proc_skip_spaces(&kbuf); 2488 2489 err = proc_get_long(&kbuf, &left, &val, &neg, 2490 proc_wspace_sep, 2491 sizeof(proc_wspace_sep), NULL); 2492 if (err) 2493 break; 2494 if (neg) 2495 continue; 2496 if ((min && val < *min) || (max && val > *max)) 2497 continue; 2498 *i = val; 2499 } else { 2500 val = convdiv * (*i) / convmul; 2501 if (!first) 2502 err = proc_put_char(&buffer, &left, '\t'); 2503 err = proc_put_long(&buffer, &left, val, false); 2504 if (err) 2505 break; 2506 } 2507 } 2508 2509 if (!write && !first && left && !err) 2510 err = proc_put_char(&buffer, &left, '\n'); 2511 if (write && !err) 2512 left -= proc_skip_spaces(&kbuf); 2513 free: 2514 if (write) { 2515 free_page(page); 2516 if (first) 2517 return err ? : -EINVAL; 2518 } 2519 *lenp -= left; 2520 *ppos += *lenp; 2521 return err; 2522 } 2523 2524 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2525 void __user *buffer, 2526 size_t *lenp, loff_t *ppos, 2527 unsigned long convmul, 2528 unsigned long convdiv) 2529 { 2530 return __do_proc_doulongvec_minmax(table->data, table, write, 2531 buffer, lenp, ppos, convmul, convdiv); 2532 } 2533 2534 /** 2535 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2536 * @table: the sysctl table 2537 * @write: %TRUE if this is a write to the sysctl file 2538 * @buffer: the user buffer 2539 * @lenp: the size of the user buffer 2540 * @ppos: file position 2541 * 2542 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2543 * values from/to the user buffer, treated as an ASCII string. 2544 * 2545 * This routine will ensure the values are within the range specified by 2546 * table->extra1 (min) and table->extra2 (max). 2547 * 2548 * Returns 0 on success. 2549 */ 2550 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2551 void __user *buffer, size_t *lenp, loff_t *ppos) 2552 { 2553 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2554 } 2555 2556 /** 2557 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2558 * @table: the sysctl table 2559 * @write: %TRUE if this is a write to the sysctl file 2560 * @buffer: the user buffer 2561 * @lenp: the size of the user buffer 2562 * @ppos: file position 2563 * 2564 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2565 * values from/to the user buffer, treated as an ASCII string. The values 2566 * are treated as milliseconds, and converted to jiffies when they are stored. 2567 * 2568 * This routine will ensure the values are within the range specified by 2569 * table->extra1 (min) and table->extra2 (max). 2570 * 2571 * Returns 0 on success. 2572 */ 2573 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2574 void __user *buffer, 2575 size_t *lenp, loff_t *ppos) 2576 { 2577 return do_proc_doulongvec_minmax(table, write, buffer, 2578 lenp, ppos, HZ, 1000l); 2579 } 2580 2581 2582 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2583 int *valp, 2584 int write, void *data) 2585 { 2586 if (write) { 2587 if (*lvalp > LONG_MAX / HZ) 2588 return 1; 2589 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2590 } else { 2591 int val = *valp; 2592 unsigned long lval; 2593 if (val < 0) { 2594 *negp = true; 2595 lval = (unsigned long)-val; 2596 } else { 2597 *negp = false; 2598 lval = (unsigned long)val; 2599 } 2600 *lvalp = lval / HZ; 2601 } 2602 return 0; 2603 } 2604 2605 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2606 int *valp, 2607 int write, void *data) 2608 { 2609 if (write) { 2610 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2611 return 1; 2612 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2613 } else { 2614 int val = *valp; 2615 unsigned long lval; 2616 if (val < 0) { 2617 *negp = true; 2618 lval = (unsigned long)-val; 2619 } else { 2620 *negp = false; 2621 lval = (unsigned long)val; 2622 } 2623 *lvalp = jiffies_to_clock_t(lval); 2624 } 2625 return 0; 2626 } 2627 2628 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2629 int *valp, 2630 int write, void *data) 2631 { 2632 if (write) { 2633 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2634 } else { 2635 int val = *valp; 2636 unsigned long lval; 2637 if (val < 0) { 2638 *negp = true; 2639 lval = (unsigned long)-val; 2640 } else { 2641 *negp = false; 2642 lval = (unsigned long)val; 2643 } 2644 *lvalp = jiffies_to_msecs(lval); 2645 } 2646 return 0; 2647 } 2648 2649 /** 2650 * proc_dointvec_jiffies - read a vector of integers as seconds 2651 * @table: the sysctl table 2652 * @write: %TRUE if this is a write to the sysctl file 2653 * @buffer: the user buffer 2654 * @lenp: the size of the user buffer 2655 * @ppos: file position 2656 * 2657 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2658 * values from/to the user buffer, treated as an ASCII string. 2659 * The values read are assumed to be in seconds, and are converted into 2660 * jiffies. 2661 * 2662 * Returns 0 on success. 2663 */ 2664 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2665 void __user *buffer, size_t *lenp, loff_t *ppos) 2666 { 2667 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2668 do_proc_dointvec_jiffies_conv,NULL); 2669 } 2670 2671 /** 2672 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2673 * @table: the sysctl table 2674 * @write: %TRUE if this is a write to the sysctl file 2675 * @buffer: the user buffer 2676 * @lenp: the size of the user buffer 2677 * @ppos: pointer to the file position 2678 * 2679 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2680 * values from/to the user buffer, treated as an ASCII string. 2681 * The values read are assumed to be in 1/USER_HZ seconds, and 2682 * are converted into jiffies. 2683 * 2684 * Returns 0 on success. 2685 */ 2686 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2687 void __user *buffer, size_t *lenp, loff_t *ppos) 2688 { 2689 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2690 do_proc_dointvec_userhz_jiffies_conv,NULL); 2691 } 2692 2693 /** 2694 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2695 * @table: the sysctl table 2696 * @write: %TRUE if this is a write to the sysctl file 2697 * @buffer: the user buffer 2698 * @lenp: the size of the user buffer 2699 * @ppos: file position 2700 * @ppos: the current position in the file 2701 * 2702 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2703 * values from/to the user buffer, treated as an ASCII string. 2704 * The values read are assumed to be in 1/1000 seconds, and 2705 * are converted into jiffies. 2706 * 2707 * Returns 0 on success. 2708 */ 2709 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2710 void __user *buffer, size_t *lenp, loff_t *ppos) 2711 { 2712 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2713 do_proc_dointvec_ms_jiffies_conv, NULL); 2714 } 2715 2716 static int proc_do_cad_pid(struct ctl_table *table, int write, 2717 void __user *buffer, size_t *lenp, loff_t *ppos) 2718 { 2719 struct pid *new_pid; 2720 pid_t tmp; 2721 int r; 2722 2723 tmp = pid_vnr(cad_pid); 2724 2725 r = __do_proc_dointvec(&tmp, table, write, buffer, 2726 lenp, ppos, NULL, NULL); 2727 if (r || !write) 2728 return r; 2729 2730 new_pid = find_get_pid(tmp); 2731 if (!new_pid) 2732 return -ESRCH; 2733 2734 put_pid(xchg(&cad_pid, new_pid)); 2735 return 0; 2736 } 2737 2738 /** 2739 * proc_do_large_bitmap - read/write from/to a large bitmap 2740 * @table: the sysctl table 2741 * @write: %TRUE if this is a write to the sysctl file 2742 * @buffer: the user buffer 2743 * @lenp: the size of the user buffer 2744 * @ppos: file position 2745 * 2746 * The bitmap is stored at table->data and the bitmap length (in bits) 2747 * in table->maxlen. 2748 * 2749 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2750 * large bitmaps may be represented in a compact manner. Writing into 2751 * the file will clear the bitmap then update it with the given input. 2752 * 2753 * Returns 0 on success. 2754 */ 2755 int proc_do_large_bitmap(struct ctl_table *table, int write, 2756 void __user *buffer, size_t *lenp, loff_t *ppos) 2757 { 2758 int err = 0; 2759 bool first = 1; 2760 size_t left = *lenp; 2761 unsigned long bitmap_len = table->maxlen; 2762 unsigned long *bitmap = (unsigned long *) table->data; 2763 unsigned long *tmp_bitmap = NULL; 2764 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2765 2766 if (!bitmap_len || !left || (*ppos && !write)) { 2767 *lenp = 0; 2768 return 0; 2769 } 2770 2771 if (write) { 2772 unsigned long page = 0; 2773 char *kbuf; 2774 2775 if (left > PAGE_SIZE - 1) 2776 left = PAGE_SIZE - 1; 2777 2778 page = __get_free_page(GFP_TEMPORARY); 2779 kbuf = (char *) page; 2780 if (!kbuf) 2781 return -ENOMEM; 2782 if (copy_from_user(kbuf, buffer, left)) { 2783 free_page(page); 2784 return -EFAULT; 2785 } 2786 kbuf[left] = 0; 2787 2788 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2789 GFP_KERNEL); 2790 if (!tmp_bitmap) { 2791 free_page(page); 2792 return -ENOMEM; 2793 } 2794 proc_skip_char(&kbuf, &left, '\n'); 2795 while (!err && left) { 2796 unsigned long val_a, val_b; 2797 bool neg; 2798 2799 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2800 sizeof(tr_a), &c); 2801 if (err) 2802 break; 2803 if (val_a >= bitmap_len || neg) { 2804 err = -EINVAL; 2805 break; 2806 } 2807 2808 val_b = val_a; 2809 if (left) { 2810 kbuf++; 2811 left--; 2812 } 2813 2814 if (c == '-') { 2815 err = proc_get_long(&kbuf, &left, &val_b, 2816 &neg, tr_b, sizeof(tr_b), 2817 &c); 2818 if (err) 2819 break; 2820 if (val_b >= bitmap_len || neg || 2821 val_a > val_b) { 2822 err = -EINVAL; 2823 break; 2824 } 2825 if (left) { 2826 kbuf++; 2827 left--; 2828 } 2829 } 2830 2831 while (val_a <= val_b) 2832 set_bit(val_a++, tmp_bitmap); 2833 2834 first = 0; 2835 proc_skip_char(&kbuf, &left, '\n'); 2836 } 2837 free_page(page); 2838 } else { 2839 unsigned long bit_a, bit_b = 0; 2840 2841 while (left) { 2842 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2843 if (bit_a >= bitmap_len) 2844 break; 2845 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2846 bit_a + 1) - 1; 2847 2848 if (!first) { 2849 err = proc_put_char(&buffer, &left, ','); 2850 if (err) 2851 break; 2852 } 2853 err = proc_put_long(&buffer, &left, bit_a, false); 2854 if (err) 2855 break; 2856 if (bit_a != bit_b) { 2857 err = proc_put_char(&buffer, &left, '-'); 2858 if (err) 2859 break; 2860 err = proc_put_long(&buffer, &left, bit_b, false); 2861 if (err) 2862 break; 2863 } 2864 2865 first = 0; bit_b++; 2866 } 2867 if (!err) 2868 err = proc_put_char(&buffer, &left, '\n'); 2869 } 2870 2871 if (!err) { 2872 if (write) { 2873 if (*ppos) 2874 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2875 else 2876 memcpy(bitmap, tmp_bitmap, 2877 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2878 } 2879 kfree(tmp_bitmap); 2880 *lenp -= left; 2881 *ppos += *lenp; 2882 return 0; 2883 } else { 2884 kfree(tmp_bitmap); 2885 return err; 2886 } 2887 } 2888 2889 #else /* CONFIG_PROC_SYSCTL */ 2890 2891 int proc_dostring(struct ctl_table *table, int write, 2892 void __user *buffer, size_t *lenp, loff_t *ppos) 2893 { 2894 return -ENOSYS; 2895 } 2896 2897 int proc_dointvec(struct ctl_table *table, int write, 2898 void __user *buffer, size_t *lenp, loff_t *ppos) 2899 { 2900 return -ENOSYS; 2901 } 2902 2903 int proc_dointvec_minmax(struct ctl_table *table, int write, 2904 void __user *buffer, size_t *lenp, loff_t *ppos) 2905 { 2906 return -ENOSYS; 2907 } 2908 2909 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2910 void __user *buffer, size_t *lenp, loff_t *ppos) 2911 { 2912 return -ENOSYS; 2913 } 2914 2915 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2916 void __user *buffer, size_t *lenp, loff_t *ppos) 2917 { 2918 return -ENOSYS; 2919 } 2920 2921 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2922 void __user *buffer, size_t *lenp, loff_t *ppos) 2923 { 2924 return -ENOSYS; 2925 } 2926 2927 int proc_doulongvec_minmax(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_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2934 void __user *buffer, 2935 size_t *lenp, loff_t *ppos) 2936 { 2937 return -ENOSYS; 2938 } 2939 2940 2941 #endif /* CONFIG_PROC_SYSCTL */ 2942 2943 /* 2944 * No sense putting this after each symbol definition, twice, 2945 * exception granted :-) 2946 */ 2947 EXPORT_SYMBOL(proc_dointvec); 2948 EXPORT_SYMBOL(proc_dointvec_jiffies); 2949 EXPORT_SYMBOL(proc_dointvec_minmax); 2950 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2951 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2952 EXPORT_SYMBOL(proc_dostring); 2953 EXPORT_SYMBOL(proc_doulongvec_minmax); 2954 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2955 EXPORT_SYMBOL(register_sysctl_table); 2956 EXPORT_SYMBOL(register_sysctl_paths); 2957 EXPORT_SYMBOL(unregister_sysctl_table); 2958