1 /* 2 * sysctl.c: General linux system control interface 3 * 4 * Begun 24 March 1995, Stephen Tweedie 5 * Added /proc support, Dec 1995 6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. 7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. 8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. 9 * Dynamic registration fixes, Stephen Tweedie. 10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. 11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris 12 * Horn. 13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. 14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. 15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill 16 * Wendling. 17 * The list_for_each() macro wasn't appropriate for the sysctl loop. 18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling 19 */ 20 21 #include <linux/module.h> 22 #include <linux/mm.h> 23 #include <linux/swap.h> 24 #include <linux/slab.h> 25 #include <linux/sysctl.h> 26 #include <linux/signal.h> 27 #include <linux/proc_fs.h> 28 #include <linux/security.h> 29 #include <linux/ctype.h> 30 #include <linux/kmemcheck.h> 31 #include <linux/fs.h> 32 #include <linux/init.h> 33 #include <linux/kernel.h> 34 #include <linux/kobject.h> 35 #include <linux/net.h> 36 #include <linux/sysrq.h> 37 #include <linux/highuid.h> 38 #include <linux/writeback.h> 39 #include <linux/ratelimit.h> 40 #include <linux/compaction.h> 41 #include <linux/hugetlb.h> 42 #include <linux/initrd.h> 43 #include <linux/key.h> 44 #include <linux/times.h> 45 #include <linux/limits.h> 46 #include <linux/dcache.h> 47 #include <linux/syscalls.h> 48 #include <linux/vmstat.h> 49 #include <linux/nfs_fs.h> 50 #include <linux/acpi.h> 51 #include <linux/reboot.h> 52 #include <linux/ftrace.h> 53 #include <linux/perf_event.h> 54 #include <linux/kprobes.h> 55 #include <linux/pipe_fs_i.h> 56 #include <linux/oom.h> 57 58 #include <asm/uaccess.h> 59 #include <asm/processor.h> 60 61 #ifdef CONFIG_X86 62 #include <asm/nmi.h> 63 #include <asm/stacktrace.h> 64 #include <asm/io.h> 65 #endif 66 #ifdef CONFIG_BSD_PROCESS_ACCT 67 #include <linux/acct.h> 68 #endif 69 #ifdef CONFIG_RT_MUTEXES 70 #include <linux/rtmutex.h> 71 #endif 72 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 73 #include <linux/lockdep.h> 74 #endif 75 #ifdef CONFIG_CHR_DEV_SG 76 #include <scsi/sg.h> 77 #endif 78 79 #ifdef CONFIG_LOCKUP_DETECTOR 80 #include <linux/nmi.h> 81 #endif 82 83 84 #if defined(CONFIG_SYSCTL) 85 86 /* External variables not in a header file. */ 87 extern int sysctl_overcommit_memory; 88 extern int sysctl_overcommit_ratio; 89 extern int max_threads; 90 extern int core_uses_pid; 91 extern int suid_dumpable; 92 extern char core_pattern[]; 93 extern unsigned int core_pipe_limit; 94 extern int pid_max; 95 extern int min_free_kbytes; 96 extern int pid_max_min, pid_max_max; 97 extern int sysctl_drop_caches; 98 extern int percpu_pagelist_fraction; 99 extern int compat_log; 100 extern int latencytop_enabled; 101 extern int sysctl_nr_open_min, sysctl_nr_open_max; 102 #ifndef CONFIG_MMU 103 extern int sysctl_nr_trim_pages; 104 #endif 105 #ifdef CONFIG_BLOCK 106 extern int blk_iopoll_enabled; 107 #endif 108 109 /* Constants used for minimum and maximum */ 110 #ifdef CONFIG_LOCKUP_DETECTOR 111 static int sixty = 60; 112 static int neg_one = -1; 113 #endif 114 115 static int zero; 116 static int __maybe_unused one = 1; 117 static int __maybe_unused two = 2; 118 static unsigned long one_ul = 1; 119 static int one_hundred = 100; 120 #ifdef CONFIG_PRINTK 121 static int ten_thousand = 10000; 122 #endif 123 124 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 125 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 126 127 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 128 static int maxolduid = 65535; 129 static int minolduid; 130 static int min_percpu_pagelist_fract = 8; 131 132 static int ngroups_max = NGROUPS_MAX; 133 134 #ifdef CONFIG_SPARC 135 #include <asm/system.h> 136 #endif 137 138 #ifdef CONFIG_SPARC64 139 extern int sysctl_tsb_ratio; 140 #endif 141 142 #ifdef __hppa__ 143 extern int pwrsw_enabled; 144 extern int unaligned_enabled; 145 #endif 146 147 #ifdef CONFIG_S390 148 #ifdef CONFIG_MATHEMU 149 extern int sysctl_ieee_emulation_warnings; 150 #endif 151 extern int sysctl_userprocess_debug; 152 extern int spin_retry; 153 #endif 154 155 #ifdef CONFIG_IA64 156 extern int no_unaligned_warning; 157 extern int unaligned_dump_stack; 158 #endif 159 160 extern struct ratelimit_state printk_ratelimit_state; 161 162 #ifdef CONFIG_PROC_SYSCTL 163 static int proc_do_cad_pid(struct ctl_table *table, int write, 164 void __user *buffer, size_t *lenp, loff_t *ppos); 165 static int proc_taint(struct ctl_table *table, int write, 166 void __user *buffer, size_t *lenp, loff_t *ppos); 167 #endif 168 169 #ifdef CONFIG_MAGIC_SYSRQ 170 static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */ 171 172 static int sysrq_sysctl_handler(ctl_table *table, int write, 173 void __user *buffer, size_t *lenp, 174 loff_t *ppos) 175 { 176 int error; 177 178 error = proc_dointvec(table, write, buffer, lenp, ppos); 179 if (error) 180 return error; 181 182 if (write) 183 sysrq_toggle_support(__sysrq_enabled); 184 185 return 0; 186 } 187 188 #endif 189 190 static struct ctl_table root_table[]; 191 static struct ctl_table_root sysctl_table_root; 192 static struct ctl_table_header root_table_header = { 193 .count = 1, 194 .ctl_table = root_table, 195 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 196 .root = &sysctl_table_root, 197 .set = &sysctl_table_root.default_set, 198 }; 199 static struct ctl_table_root sysctl_table_root = { 200 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 201 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 202 }; 203 204 static struct ctl_table kern_table[]; 205 static struct ctl_table vm_table[]; 206 static struct ctl_table fs_table[]; 207 static struct ctl_table debug_table[]; 208 static struct ctl_table dev_table[]; 209 extern struct ctl_table random_table[]; 210 #ifdef CONFIG_INOTIFY_USER 211 extern struct ctl_table inotify_table[]; 212 #endif 213 #ifdef CONFIG_EPOLL 214 extern struct ctl_table epoll_table[]; 215 #endif 216 217 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 218 int sysctl_legacy_va_layout; 219 #endif 220 221 /* The default sysctl tables: */ 222 223 static struct ctl_table root_table[] = { 224 { 225 .procname = "kernel", 226 .mode = 0555, 227 .child = kern_table, 228 }, 229 { 230 .procname = "vm", 231 .mode = 0555, 232 .child = vm_table, 233 }, 234 { 235 .procname = "fs", 236 .mode = 0555, 237 .child = fs_table, 238 }, 239 { 240 .procname = "debug", 241 .mode = 0555, 242 .child = debug_table, 243 }, 244 { 245 .procname = "dev", 246 .mode = 0555, 247 .child = dev_table, 248 }, 249 /* 250 * NOTE: do not add new entries to this table unless you have read 251 * Documentation/sysctl/ctl_unnumbered.txt 252 */ 253 { } 254 }; 255 256 #ifdef CONFIG_SCHED_DEBUG 257 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 258 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 259 static int min_wakeup_granularity_ns; /* 0 usecs */ 260 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 261 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 262 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 263 static int min_sched_shares_ratelimit = 100000; /* 100 usec */ 264 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */ 265 #endif 266 267 #ifdef CONFIG_COMPACTION 268 static int min_extfrag_threshold; 269 static int max_extfrag_threshold = 1000; 270 #endif 271 272 static struct ctl_table kern_table[] = { 273 { 274 .procname = "sched_child_runs_first", 275 .data = &sysctl_sched_child_runs_first, 276 .maxlen = sizeof(unsigned int), 277 .mode = 0644, 278 .proc_handler = proc_dointvec, 279 }, 280 #ifdef CONFIG_SCHED_DEBUG 281 { 282 .procname = "sched_min_granularity_ns", 283 .data = &sysctl_sched_min_granularity, 284 .maxlen = sizeof(unsigned int), 285 .mode = 0644, 286 .proc_handler = sched_proc_update_handler, 287 .extra1 = &min_sched_granularity_ns, 288 .extra2 = &max_sched_granularity_ns, 289 }, 290 { 291 .procname = "sched_latency_ns", 292 .data = &sysctl_sched_latency, 293 .maxlen = sizeof(unsigned int), 294 .mode = 0644, 295 .proc_handler = sched_proc_update_handler, 296 .extra1 = &min_sched_granularity_ns, 297 .extra2 = &max_sched_granularity_ns, 298 }, 299 { 300 .procname = "sched_wakeup_granularity_ns", 301 .data = &sysctl_sched_wakeup_granularity, 302 .maxlen = sizeof(unsigned int), 303 .mode = 0644, 304 .proc_handler = sched_proc_update_handler, 305 .extra1 = &min_wakeup_granularity_ns, 306 .extra2 = &max_wakeup_granularity_ns, 307 }, 308 { 309 .procname = "sched_shares_ratelimit", 310 .data = &sysctl_sched_shares_ratelimit, 311 .maxlen = sizeof(unsigned int), 312 .mode = 0644, 313 .proc_handler = sched_proc_update_handler, 314 .extra1 = &min_sched_shares_ratelimit, 315 .extra2 = &max_sched_shares_ratelimit, 316 }, 317 { 318 .procname = "sched_tunable_scaling", 319 .data = &sysctl_sched_tunable_scaling, 320 .maxlen = sizeof(enum sched_tunable_scaling), 321 .mode = 0644, 322 .proc_handler = sched_proc_update_handler, 323 .extra1 = &min_sched_tunable_scaling, 324 .extra2 = &max_sched_tunable_scaling, 325 }, 326 { 327 .procname = "sched_shares_thresh", 328 .data = &sysctl_sched_shares_thresh, 329 .maxlen = sizeof(unsigned int), 330 .mode = 0644, 331 .proc_handler = proc_dointvec_minmax, 332 .extra1 = &zero, 333 }, 334 { 335 .procname = "sched_migration_cost", 336 .data = &sysctl_sched_migration_cost, 337 .maxlen = sizeof(unsigned int), 338 .mode = 0644, 339 .proc_handler = proc_dointvec, 340 }, 341 { 342 .procname = "sched_nr_migrate", 343 .data = &sysctl_sched_nr_migrate, 344 .maxlen = sizeof(unsigned int), 345 .mode = 0644, 346 .proc_handler = proc_dointvec, 347 }, 348 { 349 .procname = "sched_time_avg", 350 .data = &sysctl_sched_time_avg, 351 .maxlen = sizeof(unsigned int), 352 .mode = 0644, 353 .proc_handler = proc_dointvec, 354 }, 355 { 356 .procname = "timer_migration", 357 .data = &sysctl_timer_migration, 358 .maxlen = sizeof(unsigned int), 359 .mode = 0644, 360 .proc_handler = proc_dointvec_minmax, 361 .extra1 = &zero, 362 .extra2 = &one, 363 }, 364 #endif 365 { 366 .procname = "sched_rt_period_us", 367 .data = &sysctl_sched_rt_period, 368 .maxlen = sizeof(unsigned int), 369 .mode = 0644, 370 .proc_handler = sched_rt_handler, 371 }, 372 { 373 .procname = "sched_rt_runtime_us", 374 .data = &sysctl_sched_rt_runtime, 375 .maxlen = sizeof(int), 376 .mode = 0644, 377 .proc_handler = sched_rt_handler, 378 }, 379 { 380 .procname = "sched_compat_yield", 381 .data = &sysctl_sched_compat_yield, 382 .maxlen = sizeof(unsigned int), 383 .mode = 0644, 384 .proc_handler = proc_dointvec, 385 }, 386 #ifdef CONFIG_PROVE_LOCKING 387 { 388 .procname = "prove_locking", 389 .data = &prove_locking, 390 .maxlen = sizeof(int), 391 .mode = 0644, 392 .proc_handler = proc_dointvec, 393 }, 394 #endif 395 #ifdef CONFIG_LOCK_STAT 396 { 397 .procname = "lock_stat", 398 .data = &lock_stat, 399 .maxlen = sizeof(int), 400 .mode = 0644, 401 .proc_handler = proc_dointvec, 402 }, 403 #endif 404 { 405 .procname = "panic", 406 .data = &panic_timeout, 407 .maxlen = sizeof(int), 408 .mode = 0644, 409 .proc_handler = proc_dointvec, 410 }, 411 { 412 .procname = "core_uses_pid", 413 .data = &core_uses_pid, 414 .maxlen = sizeof(int), 415 .mode = 0644, 416 .proc_handler = proc_dointvec, 417 }, 418 { 419 .procname = "core_pattern", 420 .data = core_pattern, 421 .maxlen = CORENAME_MAX_SIZE, 422 .mode = 0644, 423 .proc_handler = proc_dostring, 424 }, 425 { 426 .procname = "core_pipe_limit", 427 .data = &core_pipe_limit, 428 .maxlen = sizeof(unsigned int), 429 .mode = 0644, 430 .proc_handler = proc_dointvec, 431 }, 432 #ifdef CONFIG_PROC_SYSCTL 433 { 434 .procname = "tainted", 435 .maxlen = sizeof(long), 436 .mode = 0644, 437 .proc_handler = proc_taint, 438 }, 439 #endif 440 #ifdef CONFIG_LATENCYTOP 441 { 442 .procname = "latencytop", 443 .data = &latencytop_enabled, 444 .maxlen = sizeof(int), 445 .mode = 0644, 446 .proc_handler = proc_dointvec, 447 }, 448 #endif 449 #ifdef CONFIG_BLK_DEV_INITRD 450 { 451 .procname = "real-root-dev", 452 .data = &real_root_dev, 453 .maxlen = sizeof(int), 454 .mode = 0644, 455 .proc_handler = proc_dointvec, 456 }, 457 #endif 458 { 459 .procname = "print-fatal-signals", 460 .data = &print_fatal_signals, 461 .maxlen = sizeof(int), 462 .mode = 0644, 463 .proc_handler = proc_dointvec, 464 }, 465 #ifdef CONFIG_SPARC 466 { 467 .procname = "reboot-cmd", 468 .data = reboot_command, 469 .maxlen = 256, 470 .mode = 0644, 471 .proc_handler = proc_dostring, 472 }, 473 { 474 .procname = "stop-a", 475 .data = &stop_a_enabled, 476 .maxlen = sizeof (int), 477 .mode = 0644, 478 .proc_handler = proc_dointvec, 479 }, 480 { 481 .procname = "scons-poweroff", 482 .data = &scons_pwroff, 483 .maxlen = sizeof (int), 484 .mode = 0644, 485 .proc_handler = proc_dointvec, 486 }, 487 #endif 488 #ifdef CONFIG_SPARC64 489 { 490 .procname = "tsb-ratio", 491 .data = &sysctl_tsb_ratio, 492 .maxlen = sizeof (int), 493 .mode = 0644, 494 .proc_handler = proc_dointvec, 495 }, 496 #endif 497 #ifdef __hppa__ 498 { 499 .procname = "soft-power", 500 .data = &pwrsw_enabled, 501 .maxlen = sizeof (int), 502 .mode = 0644, 503 .proc_handler = proc_dointvec, 504 }, 505 { 506 .procname = "unaligned-trap", 507 .data = &unaligned_enabled, 508 .maxlen = sizeof (int), 509 .mode = 0644, 510 .proc_handler = proc_dointvec, 511 }, 512 #endif 513 { 514 .procname = "ctrl-alt-del", 515 .data = &C_A_D, 516 .maxlen = sizeof(int), 517 .mode = 0644, 518 .proc_handler = proc_dointvec, 519 }, 520 #ifdef CONFIG_FUNCTION_TRACER 521 { 522 .procname = "ftrace_enabled", 523 .data = &ftrace_enabled, 524 .maxlen = sizeof(int), 525 .mode = 0644, 526 .proc_handler = ftrace_enable_sysctl, 527 }, 528 #endif 529 #ifdef CONFIG_STACK_TRACER 530 { 531 .procname = "stack_tracer_enabled", 532 .data = &stack_tracer_enabled, 533 .maxlen = sizeof(int), 534 .mode = 0644, 535 .proc_handler = stack_trace_sysctl, 536 }, 537 #endif 538 #ifdef CONFIG_TRACING 539 { 540 .procname = "ftrace_dump_on_oops", 541 .data = &ftrace_dump_on_oops, 542 .maxlen = sizeof(int), 543 .mode = 0644, 544 .proc_handler = proc_dointvec, 545 }, 546 #endif 547 #ifdef CONFIG_MODULES 548 { 549 .procname = "modprobe", 550 .data = &modprobe_path, 551 .maxlen = KMOD_PATH_LEN, 552 .mode = 0644, 553 .proc_handler = proc_dostring, 554 }, 555 { 556 .procname = "modules_disabled", 557 .data = &modules_disabled, 558 .maxlen = sizeof(int), 559 .mode = 0644, 560 /* only handle a transition from default "0" to "1" */ 561 .proc_handler = proc_dointvec_minmax, 562 .extra1 = &one, 563 .extra2 = &one, 564 }, 565 #endif 566 #ifdef CONFIG_HOTPLUG 567 { 568 .procname = "hotplug", 569 .data = &uevent_helper, 570 .maxlen = UEVENT_HELPER_PATH_LEN, 571 .mode = 0644, 572 .proc_handler = proc_dostring, 573 }, 574 #endif 575 #ifdef CONFIG_CHR_DEV_SG 576 { 577 .procname = "sg-big-buff", 578 .data = &sg_big_buff, 579 .maxlen = sizeof (int), 580 .mode = 0444, 581 .proc_handler = proc_dointvec, 582 }, 583 #endif 584 #ifdef CONFIG_BSD_PROCESS_ACCT 585 { 586 .procname = "acct", 587 .data = &acct_parm, 588 .maxlen = 3*sizeof(int), 589 .mode = 0644, 590 .proc_handler = proc_dointvec, 591 }, 592 #endif 593 #ifdef CONFIG_MAGIC_SYSRQ 594 { 595 .procname = "sysrq", 596 .data = &__sysrq_enabled, 597 .maxlen = sizeof (int), 598 .mode = 0644, 599 .proc_handler = sysrq_sysctl_handler, 600 }, 601 #endif 602 #ifdef CONFIG_PROC_SYSCTL 603 { 604 .procname = "cad_pid", 605 .data = NULL, 606 .maxlen = sizeof (int), 607 .mode = 0600, 608 .proc_handler = proc_do_cad_pid, 609 }, 610 #endif 611 { 612 .procname = "threads-max", 613 .data = &max_threads, 614 .maxlen = sizeof(int), 615 .mode = 0644, 616 .proc_handler = proc_dointvec, 617 }, 618 { 619 .procname = "random", 620 .mode = 0555, 621 .child = random_table, 622 }, 623 { 624 .procname = "overflowuid", 625 .data = &overflowuid, 626 .maxlen = sizeof(int), 627 .mode = 0644, 628 .proc_handler = proc_dointvec_minmax, 629 .extra1 = &minolduid, 630 .extra2 = &maxolduid, 631 }, 632 { 633 .procname = "overflowgid", 634 .data = &overflowgid, 635 .maxlen = sizeof(int), 636 .mode = 0644, 637 .proc_handler = proc_dointvec_minmax, 638 .extra1 = &minolduid, 639 .extra2 = &maxolduid, 640 }, 641 #ifdef CONFIG_S390 642 #ifdef CONFIG_MATHEMU 643 { 644 .procname = "ieee_emulation_warnings", 645 .data = &sysctl_ieee_emulation_warnings, 646 .maxlen = sizeof(int), 647 .mode = 0644, 648 .proc_handler = proc_dointvec, 649 }, 650 #endif 651 { 652 .procname = "userprocess_debug", 653 .data = &show_unhandled_signals, 654 .maxlen = sizeof(int), 655 .mode = 0644, 656 .proc_handler = proc_dointvec, 657 }, 658 #endif 659 { 660 .procname = "pid_max", 661 .data = &pid_max, 662 .maxlen = sizeof (int), 663 .mode = 0644, 664 .proc_handler = proc_dointvec_minmax, 665 .extra1 = &pid_max_min, 666 .extra2 = &pid_max_max, 667 }, 668 { 669 .procname = "panic_on_oops", 670 .data = &panic_on_oops, 671 .maxlen = sizeof(int), 672 .mode = 0644, 673 .proc_handler = proc_dointvec, 674 }, 675 #if defined CONFIG_PRINTK 676 { 677 .procname = "printk", 678 .data = &console_loglevel, 679 .maxlen = 4*sizeof(int), 680 .mode = 0644, 681 .proc_handler = proc_dointvec, 682 }, 683 { 684 .procname = "printk_ratelimit", 685 .data = &printk_ratelimit_state.interval, 686 .maxlen = sizeof(int), 687 .mode = 0644, 688 .proc_handler = proc_dointvec_jiffies, 689 }, 690 { 691 .procname = "printk_ratelimit_burst", 692 .data = &printk_ratelimit_state.burst, 693 .maxlen = sizeof(int), 694 .mode = 0644, 695 .proc_handler = proc_dointvec, 696 }, 697 { 698 .procname = "printk_delay", 699 .data = &printk_delay_msec, 700 .maxlen = sizeof(int), 701 .mode = 0644, 702 .proc_handler = proc_dointvec_minmax, 703 .extra1 = &zero, 704 .extra2 = &ten_thousand, 705 }, 706 #endif 707 { 708 .procname = "ngroups_max", 709 .data = &ngroups_max, 710 .maxlen = sizeof (int), 711 .mode = 0444, 712 .proc_handler = proc_dointvec, 713 }, 714 #if defined(CONFIG_LOCKUP_DETECTOR) 715 { 716 .procname = "watchdog", 717 .data = &watchdog_enabled, 718 .maxlen = sizeof (int), 719 .mode = 0644, 720 .proc_handler = proc_dowatchdog_enabled, 721 }, 722 { 723 .procname = "watchdog_thresh", 724 .data = &softlockup_thresh, 725 .maxlen = sizeof(int), 726 .mode = 0644, 727 .proc_handler = proc_dowatchdog_thresh, 728 .extra1 = &neg_one, 729 .extra2 = &sixty, 730 }, 731 { 732 .procname = "softlockup_panic", 733 .data = &softlockup_panic, 734 .maxlen = sizeof(int), 735 .mode = 0644, 736 .proc_handler = proc_dointvec_minmax, 737 .extra1 = &zero, 738 .extra2 = &one, 739 }, 740 #endif 741 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR) 742 { 743 .procname = "unknown_nmi_panic", 744 .data = &unknown_nmi_panic, 745 .maxlen = sizeof (int), 746 .mode = 0644, 747 .proc_handler = proc_dointvec, 748 }, 749 { 750 .procname = "nmi_watchdog", 751 .data = &nmi_watchdog_enabled, 752 .maxlen = sizeof (int), 753 .mode = 0644, 754 .proc_handler = proc_nmi_enabled, 755 }, 756 #endif 757 #if defined(CONFIG_X86) 758 { 759 .procname = "panic_on_unrecovered_nmi", 760 .data = &panic_on_unrecovered_nmi, 761 .maxlen = sizeof(int), 762 .mode = 0644, 763 .proc_handler = proc_dointvec, 764 }, 765 { 766 .procname = "panic_on_io_nmi", 767 .data = &panic_on_io_nmi, 768 .maxlen = sizeof(int), 769 .mode = 0644, 770 .proc_handler = proc_dointvec, 771 }, 772 { 773 .procname = "bootloader_type", 774 .data = &bootloader_type, 775 .maxlen = sizeof (int), 776 .mode = 0444, 777 .proc_handler = proc_dointvec, 778 }, 779 { 780 .procname = "bootloader_version", 781 .data = &bootloader_version, 782 .maxlen = sizeof (int), 783 .mode = 0444, 784 .proc_handler = proc_dointvec, 785 }, 786 { 787 .procname = "kstack_depth_to_print", 788 .data = &kstack_depth_to_print, 789 .maxlen = sizeof(int), 790 .mode = 0644, 791 .proc_handler = proc_dointvec, 792 }, 793 { 794 .procname = "io_delay_type", 795 .data = &io_delay_type, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec, 799 }, 800 #endif 801 #if defined(CONFIG_MMU) 802 { 803 .procname = "randomize_va_space", 804 .data = &randomize_va_space, 805 .maxlen = sizeof(int), 806 .mode = 0644, 807 .proc_handler = proc_dointvec, 808 }, 809 #endif 810 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 811 { 812 .procname = "spin_retry", 813 .data = &spin_retry, 814 .maxlen = sizeof (int), 815 .mode = 0644, 816 .proc_handler = proc_dointvec, 817 }, 818 #endif 819 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 820 { 821 .procname = "acpi_video_flags", 822 .data = &acpi_realmode_flags, 823 .maxlen = sizeof (unsigned long), 824 .mode = 0644, 825 .proc_handler = proc_doulongvec_minmax, 826 }, 827 #endif 828 #ifdef CONFIG_IA64 829 { 830 .procname = "ignore-unaligned-usertrap", 831 .data = &no_unaligned_warning, 832 .maxlen = sizeof (int), 833 .mode = 0644, 834 .proc_handler = proc_dointvec, 835 }, 836 { 837 .procname = "unaligned-dump-stack", 838 .data = &unaligned_dump_stack, 839 .maxlen = sizeof (int), 840 .mode = 0644, 841 .proc_handler = proc_dointvec, 842 }, 843 #endif 844 #ifdef CONFIG_DETECT_HUNG_TASK 845 { 846 .procname = "hung_task_panic", 847 .data = &sysctl_hung_task_panic, 848 .maxlen = sizeof(int), 849 .mode = 0644, 850 .proc_handler = proc_dointvec_minmax, 851 .extra1 = &zero, 852 .extra2 = &one, 853 }, 854 { 855 .procname = "hung_task_check_count", 856 .data = &sysctl_hung_task_check_count, 857 .maxlen = sizeof(unsigned long), 858 .mode = 0644, 859 .proc_handler = proc_doulongvec_minmax, 860 }, 861 { 862 .procname = "hung_task_timeout_secs", 863 .data = &sysctl_hung_task_timeout_secs, 864 .maxlen = sizeof(unsigned long), 865 .mode = 0644, 866 .proc_handler = proc_dohung_task_timeout_secs, 867 }, 868 { 869 .procname = "hung_task_warnings", 870 .data = &sysctl_hung_task_warnings, 871 .maxlen = sizeof(unsigned long), 872 .mode = 0644, 873 .proc_handler = proc_doulongvec_minmax, 874 }, 875 #endif 876 #ifdef CONFIG_COMPAT 877 { 878 .procname = "compat-log", 879 .data = &compat_log, 880 .maxlen = sizeof (int), 881 .mode = 0644, 882 .proc_handler = proc_dointvec, 883 }, 884 #endif 885 #ifdef CONFIG_RT_MUTEXES 886 { 887 .procname = "max_lock_depth", 888 .data = &max_lock_depth, 889 .maxlen = sizeof(int), 890 .mode = 0644, 891 .proc_handler = proc_dointvec, 892 }, 893 #endif 894 { 895 .procname = "poweroff_cmd", 896 .data = &poweroff_cmd, 897 .maxlen = POWEROFF_CMD_PATH_LEN, 898 .mode = 0644, 899 .proc_handler = proc_dostring, 900 }, 901 #ifdef CONFIG_KEYS 902 { 903 .procname = "keys", 904 .mode = 0555, 905 .child = key_sysctls, 906 }, 907 #endif 908 #ifdef CONFIG_RCU_TORTURE_TEST 909 { 910 .procname = "rcutorture_runnable", 911 .data = &rcutorture_runnable, 912 .maxlen = sizeof(int), 913 .mode = 0644, 914 .proc_handler = proc_dointvec, 915 }, 916 #endif 917 #ifdef CONFIG_PERF_EVENTS 918 { 919 .procname = "perf_event_paranoid", 920 .data = &sysctl_perf_event_paranoid, 921 .maxlen = sizeof(sysctl_perf_event_paranoid), 922 .mode = 0644, 923 .proc_handler = proc_dointvec, 924 }, 925 { 926 .procname = "perf_event_mlock_kb", 927 .data = &sysctl_perf_event_mlock, 928 .maxlen = sizeof(sysctl_perf_event_mlock), 929 .mode = 0644, 930 .proc_handler = proc_dointvec, 931 }, 932 { 933 .procname = "perf_event_max_sample_rate", 934 .data = &sysctl_perf_event_sample_rate, 935 .maxlen = sizeof(sysctl_perf_event_sample_rate), 936 .mode = 0644, 937 .proc_handler = proc_dointvec, 938 }, 939 #endif 940 #ifdef CONFIG_KMEMCHECK 941 { 942 .procname = "kmemcheck", 943 .data = &kmemcheck_enabled, 944 .maxlen = sizeof(int), 945 .mode = 0644, 946 .proc_handler = proc_dointvec, 947 }, 948 #endif 949 #ifdef CONFIG_BLOCK 950 { 951 .procname = "blk_iopoll", 952 .data = &blk_iopoll_enabled, 953 .maxlen = sizeof(int), 954 .mode = 0644, 955 .proc_handler = proc_dointvec, 956 }, 957 #endif 958 /* 959 * NOTE: do not add new entries to this table unless you have read 960 * Documentation/sysctl/ctl_unnumbered.txt 961 */ 962 { } 963 }; 964 965 static struct ctl_table vm_table[] = { 966 { 967 .procname = "overcommit_memory", 968 .data = &sysctl_overcommit_memory, 969 .maxlen = sizeof(sysctl_overcommit_memory), 970 .mode = 0644, 971 .proc_handler = proc_dointvec, 972 }, 973 { 974 .procname = "panic_on_oom", 975 .data = &sysctl_panic_on_oom, 976 .maxlen = sizeof(sysctl_panic_on_oom), 977 .mode = 0644, 978 .proc_handler = proc_dointvec, 979 }, 980 { 981 .procname = "oom_kill_allocating_task", 982 .data = &sysctl_oom_kill_allocating_task, 983 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 984 .mode = 0644, 985 .proc_handler = proc_dointvec, 986 }, 987 { 988 .procname = "oom_dump_tasks", 989 .data = &sysctl_oom_dump_tasks, 990 .maxlen = sizeof(sysctl_oom_dump_tasks), 991 .mode = 0644, 992 .proc_handler = proc_dointvec, 993 }, 994 { 995 .procname = "overcommit_ratio", 996 .data = &sysctl_overcommit_ratio, 997 .maxlen = sizeof(sysctl_overcommit_ratio), 998 .mode = 0644, 999 .proc_handler = proc_dointvec, 1000 }, 1001 { 1002 .procname = "page-cluster", 1003 .data = &page_cluster, 1004 .maxlen = sizeof(int), 1005 .mode = 0644, 1006 .proc_handler = proc_dointvec, 1007 }, 1008 { 1009 .procname = "dirty_background_ratio", 1010 .data = &dirty_background_ratio, 1011 .maxlen = sizeof(dirty_background_ratio), 1012 .mode = 0644, 1013 .proc_handler = dirty_background_ratio_handler, 1014 .extra1 = &zero, 1015 .extra2 = &one_hundred, 1016 }, 1017 { 1018 .procname = "dirty_background_bytes", 1019 .data = &dirty_background_bytes, 1020 .maxlen = sizeof(dirty_background_bytes), 1021 .mode = 0644, 1022 .proc_handler = dirty_background_bytes_handler, 1023 .extra1 = &one_ul, 1024 }, 1025 { 1026 .procname = "dirty_ratio", 1027 .data = &vm_dirty_ratio, 1028 .maxlen = sizeof(vm_dirty_ratio), 1029 .mode = 0644, 1030 .proc_handler = dirty_ratio_handler, 1031 .extra1 = &zero, 1032 .extra2 = &one_hundred, 1033 }, 1034 { 1035 .procname = "dirty_bytes", 1036 .data = &vm_dirty_bytes, 1037 .maxlen = sizeof(vm_dirty_bytes), 1038 .mode = 0644, 1039 .proc_handler = dirty_bytes_handler, 1040 .extra1 = &dirty_bytes_min, 1041 }, 1042 { 1043 .procname = "dirty_writeback_centisecs", 1044 .data = &dirty_writeback_interval, 1045 .maxlen = sizeof(dirty_writeback_interval), 1046 .mode = 0644, 1047 .proc_handler = dirty_writeback_centisecs_handler, 1048 }, 1049 { 1050 .procname = "dirty_expire_centisecs", 1051 .data = &dirty_expire_interval, 1052 .maxlen = sizeof(dirty_expire_interval), 1053 .mode = 0644, 1054 .proc_handler = proc_dointvec, 1055 }, 1056 { 1057 .procname = "nr_pdflush_threads", 1058 .data = &nr_pdflush_threads, 1059 .maxlen = sizeof nr_pdflush_threads, 1060 .mode = 0444 /* read-only*/, 1061 .proc_handler = proc_dointvec, 1062 }, 1063 { 1064 .procname = "swappiness", 1065 .data = &vm_swappiness, 1066 .maxlen = sizeof(vm_swappiness), 1067 .mode = 0644, 1068 .proc_handler = proc_dointvec_minmax, 1069 .extra1 = &zero, 1070 .extra2 = &one_hundred, 1071 }, 1072 #ifdef CONFIG_HUGETLB_PAGE 1073 { 1074 .procname = "nr_hugepages", 1075 .data = NULL, 1076 .maxlen = sizeof(unsigned long), 1077 .mode = 0644, 1078 .proc_handler = hugetlb_sysctl_handler, 1079 .extra1 = (void *)&hugetlb_zero, 1080 .extra2 = (void *)&hugetlb_infinity, 1081 }, 1082 #ifdef CONFIG_NUMA 1083 { 1084 .procname = "nr_hugepages_mempolicy", 1085 .data = NULL, 1086 .maxlen = sizeof(unsigned long), 1087 .mode = 0644, 1088 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1089 .extra1 = (void *)&hugetlb_zero, 1090 .extra2 = (void *)&hugetlb_infinity, 1091 }, 1092 #endif 1093 { 1094 .procname = "hugetlb_shm_group", 1095 .data = &sysctl_hugetlb_shm_group, 1096 .maxlen = sizeof(gid_t), 1097 .mode = 0644, 1098 .proc_handler = proc_dointvec, 1099 }, 1100 { 1101 .procname = "hugepages_treat_as_movable", 1102 .data = &hugepages_treat_as_movable, 1103 .maxlen = sizeof(int), 1104 .mode = 0644, 1105 .proc_handler = hugetlb_treat_movable_handler, 1106 }, 1107 { 1108 .procname = "nr_overcommit_hugepages", 1109 .data = NULL, 1110 .maxlen = sizeof(unsigned long), 1111 .mode = 0644, 1112 .proc_handler = hugetlb_overcommit_handler, 1113 .extra1 = (void *)&hugetlb_zero, 1114 .extra2 = (void *)&hugetlb_infinity, 1115 }, 1116 #endif 1117 { 1118 .procname = "lowmem_reserve_ratio", 1119 .data = &sysctl_lowmem_reserve_ratio, 1120 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1121 .mode = 0644, 1122 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1123 }, 1124 { 1125 .procname = "drop_caches", 1126 .data = &sysctl_drop_caches, 1127 .maxlen = sizeof(int), 1128 .mode = 0644, 1129 .proc_handler = drop_caches_sysctl_handler, 1130 }, 1131 #ifdef CONFIG_COMPACTION 1132 { 1133 .procname = "compact_memory", 1134 .data = &sysctl_compact_memory, 1135 .maxlen = sizeof(int), 1136 .mode = 0200, 1137 .proc_handler = sysctl_compaction_handler, 1138 }, 1139 { 1140 .procname = "extfrag_threshold", 1141 .data = &sysctl_extfrag_threshold, 1142 .maxlen = sizeof(int), 1143 .mode = 0644, 1144 .proc_handler = sysctl_extfrag_handler, 1145 .extra1 = &min_extfrag_threshold, 1146 .extra2 = &max_extfrag_threshold, 1147 }, 1148 1149 #endif /* CONFIG_COMPACTION */ 1150 { 1151 .procname = "min_free_kbytes", 1152 .data = &min_free_kbytes, 1153 .maxlen = sizeof(min_free_kbytes), 1154 .mode = 0644, 1155 .proc_handler = min_free_kbytes_sysctl_handler, 1156 .extra1 = &zero, 1157 }, 1158 { 1159 .procname = "percpu_pagelist_fraction", 1160 .data = &percpu_pagelist_fraction, 1161 .maxlen = sizeof(percpu_pagelist_fraction), 1162 .mode = 0644, 1163 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1164 .extra1 = &min_percpu_pagelist_fract, 1165 }, 1166 #ifdef CONFIG_MMU 1167 { 1168 .procname = "max_map_count", 1169 .data = &sysctl_max_map_count, 1170 .maxlen = sizeof(sysctl_max_map_count), 1171 .mode = 0644, 1172 .proc_handler = proc_dointvec_minmax, 1173 .extra1 = &zero, 1174 }, 1175 #else 1176 { 1177 .procname = "nr_trim_pages", 1178 .data = &sysctl_nr_trim_pages, 1179 .maxlen = sizeof(sysctl_nr_trim_pages), 1180 .mode = 0644, 1181 .proc_handler = proc_dointvec_minmax, 1182 .extra1 = &zero, 1183 }, 1184 #endif 1185 { 1186 .procname = "laptop_mode", 1187 .data = &laptop_mode, 1188 .maxlen = sizeof(laptop_mode), 1189 .mode = 0644, 1190 .proc_handler = proc_dointvec_jiffies, 1191 }, 1192 { 1193 .procname = "block_dump", 1194 .data = &block_dump, 1195 .maxlen = sizeof(block_dump), 1196 .mode = 0644, 1197 .proc_handler = proc_dointvec, 1198 .extra1 = &zero, 1199 }, 1200 { 1201 .procname = "vfs_cache_pressure", 1202 .data = &sysctl_vfs_cache_pressure, 1203 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1204 .mode = 0644, 1205 .proc_handler = proc_dointvec, 1206 .extra1 = &zero, 1207 }, 1208 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1209 { 1210 .procname = "legacy_va_layout", 1211 .data = &sysctl_legacy_va_layout, 1212 .maxlen = sizeof(sysctl_legacy_va_layout), 1213 .mode = 0644, 1214 .proc_handler = proc_dointvec, 1215 .extra1 = &zero, 1216 }, 1217 #endif 1218 #ifdef CONFIG_NUMA 1219 { 1220 .procname = "zone_reclaim_mode", 1221 .data = &zone_reclaim_mode, 1222 .maxlen = sizeof(zone_reclaim_mode), 1223 .mode = 0644, 1224 .proc_handler = proc_dointvec, 1225 .extra1 = &zero, 1226 }, 1227 { 1228 .procname = "min_unmapped_ratio", 1229 .data = &sysctl_min_unmapped_ratio, 1230 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1231 .mode = 0644, 1232 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1233 .extra1 = &zero, 1234 .extra2 = &one_hundred, 1235 }, 1236 { 1237 .procname = "min_slab_ratio", 1238 .data = &sysctl_min_slab_ratio, 1239 .maxlen = sizeof(sysctl_min_slab_ratio), 1240 .mode = 0644, 1241 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1242 .extra1 = &zero, 1243 .extra2 = &one_hundred, 1244 }, 1245 #endif 1246 #ifdef CONFIG_SMP 1247 { 1248 .procname = "stat_interval", 1249 .data = &sysctl_stat_interval, 1250 .maxlen = sizeof(sysctl_stat_interval), 1251 .mode = 0644, 1252 .proc_handler = proc_dointvec_jiffies, 1253 }, 1254 #endif 1255 #ifdef CONFIG_MMU 1256 { 1257 .procname = "mmap_min_addr", 1258 .data = &dac_mmap_min_addr, 1259 .maxlen = sizeof(unsigned long), 1260 .mode = 0644, 1261 .proc_handler = mmap_min_addr_handler, 1262 }, 1263 #endif 1264 #ifdef CONFIG_NUMA 1265 { 1266 .procname = "numa_zonelist_order", 1267 .data = &numa_zonelist_order, 1268 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1269 .mode = 0644, 1270 .proc_handler = numa_zonelist_order_handler, 1271 }, 1272 #endif 1273 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1274 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1275 { 1276 .procname = "vdso_enabled", 1277 .data = &vdso_enabled, 1278 .maxlen = sizeof(vdso_enabled), 1279 .mode = 0644, 1280 .proc_handler = proc_dointvec, 1281 .extra1 = &zero, 1282 }, 1283 #endif 1284 #ifdef CONFIG_HIGHMEM 1285 { 1286 .procname = "highmem_is_dirtyable", 1287 .data = &vm_highmem_is_dirtyable, 1288 .maxlen = sizeof(vm_highmem_is_dirtyable), 1289 .mode = 0644, 1290 .proc_handler = proc_dointvec_minmax, 1291 .extra1 = &zero, 1292 .extra2 = &one, 1293 }, 1294 #endif 1295 { 1296 .procname = "scan_unevictable_pages", 1297 .data = &scan_unevictable_pages, 1298 .maxlen = sizeof(scan_unevictable_pages), 1299 .mode = 0644, 1300 .proc_handler = scan_unevictable_handler, 1301 }, 1302 #ifdef CONFIG_MEMORY_FAILURE 1303 { 1304 .procname = "memory_failure_early_kill", 1305 .data = &sysctl_memory_failure_early_kill, 1306 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1307 .mode = 0644, 1308 .proc_handler = proc_dointvec_minmax, 1309 .extra1 = &zero, 1310 .extra2 = &one, 1311 }, 1312 { 1313 .procname = "memory_failure_recovery", 1314 .data = &sysctl_memory_failure_recovery, 1315 .maxlen = sizeof(sysctl_memory_failure_recovery), 1316 .mode = 0644, 1317 .proc_handler = proc_dointvec_minmax, 1318 .extra1 = &zero, 1319 .extra2 = &one, 1320 }, 1321 #endif 1322 1323 /* 1324 * NOTE: do not add new entries to this table unless you have read 1325 * Documentation/sysctl/ctl_unnumbered.txt 1326 */ 1327 { } 1328 }; 1329 1330 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1331 static struct ctl_table binfmt_misc_table[] = { 1332 { } 1333 }; 1334 #endif 1335 1336 static struct ctl_table fs_table[] = { 1337 { 1338 .procname = "inode-nr", 1339 .data = &inodes_stat, 1340 .maxlen = 2*sizeof(int), 1341 .mode = 0444, 1342 .proc_handler = proc_dointvec, 1343 }, 1344 { 1345 .procname = "inode-state", 1346 .data = &inodes_stat, 1347 .maxlen = 7*sizeof(int), 1348 .mode = 0444, 1349 .proc_handler = proc_dointvec, 1350 }, 1351 { 1352 .procname = "file-nr", 1353 .data = &files_stat, 1354 .maxlen = 3*sizeof(int), 1355 .mode = 0444, 1356 .proc_handler = proc_nr_files, 1357 }, 1358 { 1359 .procname = "file-max", 1360 .data = &files_stat.max_files, 1361 .maxlen = sizeof(int), 1362 .mode = 0644, 1363 .proc_handler = proc_dointvec, 1364 }, 1365 { 1366 .procname = "nr_open", 1367 .data = &sysctl_nr_open, 1368 .maxlen = sizeof(int), 1369 .mode = 0644, 1370 .proc_handler = proc_dointvec_minmax, 1371 .extra1 = &sysctl_nr_open_min, 1372 .extra2 = &sysctl_nr_open_max, 1373 }, 1374 { 1375 .procname = "dentry-state", 1376 .data = &dentry_stat, 1377 .maxlen = 6*sizeof(int), 1378 .mode = 0444, 1379 .proc_handler = proc_dointvec, 1380 }, 1381 { 1382 .procname = "overflowuid", 1383 .data = &fs_overflowuid, 1384 .maxlen = sizeof(int), 1385 .mode = 0644, 1386 .proc_handler = proc_dointvec_minmax, 1387 .extra1 = &minolduid, 1388 .extra2 = &maxolduid, 1389 }, 1390 { 1391 .procname = "overflowgid", 1392 .data = &fs_overflowgid, 1393 .maxlen = sizeof(int), 1394 .mode = 0644, 1395 .proc_handler = proc_dointvec_minmax, 1396 .extra1 = &minolduid, 1397 .extra2 = &maxolduid, 1398 }, 1399 #ifdef CONFIG_FILE_LOCKING 1400 { 1401 .procname = "leases-enable", 1402 .data = &leases_enable, 1403 .maxlen = sizeof(int), 1404 .mode = 0644, 1405 .proc_handler = proc_dointvec, 1406 }, 1407 #endif 1408 #ifdef CONFIG_DNOTIFY 1409 { 1410 .procname = "dir-notify-enable", 1411 .data = &dir_notify_enable, 1412 .maxlen = sizeof(int), 1413 .mode = 0644, 1414 .proc_handler = proc_dointvec, 1415 }, 1416 #endif 1417 #ifdef CONFIG_MMU 1418 #ifdef CONFIG_FILE_LOCKING 1419 { 1420 .procname = "lease-break-time", 1421 .data = &lease_break_time, 1422 .maxlen = sizeof(int), 1423 .mode = 0644, 1424 .proc_handler = proc_dointvec, 1425 }, 1426 #endif 1427 #ifdef CONFIG_AIO 1428 { 1429 .procname = "aio-nr", 1430 .data = &aio_nr, 1431 .maxlen = sizeof(aio_nr), 1432 .mode = 0444, 1433 .proc_handler = proc_doulongvec_minmax, 1434 }, 1435 { 1436 .procname = "aio-max-nr", 1437 .data = &aio_max_nr, 1438 .maxlen = sizeof(aio_max_nr), 1439 .mode = 0644, 1440 .proc_handler = proc_doulongvec_minmax, 1441 }, 1442 #endif /* CONFIG_AIO */ 1443 #ifdef CONFIG_INOTIFY_USER 1444 { 1445 .procname = "inotify", 1446 .mode = 0555, 1447 .child = inotify_table, 1448 }, 1449 #endif 1450 #ifdef CONFIG_EPOLL 1451 { 1452 .procname = "epoll", 1453 .mode = 0555, 1454 .child = epoll_table, 1455 }, 1456 #endif 1457 #endif 1458 { 1459 .procname = "suid_dumpable", 1460 .data = &suid_dumpable, 1461 .maxlen = sizeof(int), 1462 .mode = 0644, 1463 .proc_handler = proc_dointvec_minmax, 1464 .extra1 = &zero, 1465 .extra2 = &two, 1466 }, 1467 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1468 { 1469 .procname = "binfmt_misc", 1470 .mode = 0555, 1471 .child = binfmt_misc_table, 1472 }, 1473 #endif 1474 { 1475 .procname = "pipe-max-size", 1476 .data = &pipe_max_size, 1477 .maxlen = sizeof(int), 1478 .mode = 0644, 1479 .proc_handler = &pipe_proc_fn, 1480 .extra1 = &pipe_min_size, 1481 }, 1482 /* 1483 * NOTE: do not add new entries to this table unless you have read 1484 * Documentation/sysctl/ctl_unnumbered.txt 1485 */ 1486 { } 1487 }; 1488 1489 static struct ctl_table debug_table[] = { 1490 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1491 defined(CONFIG_S390) 1492 { 1493 .procname = "exception-trace", 1494 .data = &show_unhandled_signals, 1495 .maxlen = sizeof(int), 1496 .mode = 0644, 1497 .proc_handler = proc_dointvec 1498 }, 1499 #endif 1500 #if defined(CONFIG_OPTPROBES) 1501 { 1502 .procname = "kprobes-optimization", 1503 .data = &sysctl_kprobes_optimization, 1504 .maxlen = sizeof(int), 1505 .mode = 0644, 1506 .proc_handler = proc_kprobes_optimization_handler, 1507 .extra1 = &zero, 1508 .extra2 = &one, 1509 }, 1510 #endif 1511 { } 1512 }; 1513 1514 static struct ctl_table dev_table[] = { 1515 { } 1516 }; 1517 1518 static DEFINE_SPINLOCK(sysctl_lock); 1519 1520 /* called under sysctl_lock */ 1521 static int use_table(struct ctl_table_header *p) 1522 { 1523 if (unlikely(p->unregistering)) 1524 return 0; 1525 p->used++; 1526 return 1; 1527 } 1528 1529 /* called under sysctl_lock */ 1530 static void unuse_table(struct ctl_table_header *p) 1531 { 1532 if (!--p->used) 1533 if (unlikely(p->unregistering)) 1534 complete(p->unregistering); 1535 } 1536 1537 /* called under sysctl_lock, will reacquire if has to wait */ 1538 static void start_unregistering(struct ctl_table_header *p) 1539 { 1540 /* 1541 * if p->used is 0, nobody will ever touch that entry again; 1542 * we'll eliminate all paths to it before dropping sysctl_lock 1543 */ 1544 if (unlikely(p->used)) { 1545 struct completion wait; 1546 init_completion(&wait); 1547 p->unregistering = &wait; 1548 spin_unlock(&sysctl_lock); 1549 wait_for_completion(&wait); 1550 spin_lock(&sysctl_lock); 1551 } else { 1552 /* anything non-NULL; we'll never dereference it */ 1553 p->unregistering = ERR_PTR(-EINVAL); 1554 } 1555 /* 1556 * do not remove from the list until nobody holds it; walking the 1557 * list in do_sysctl() relies on that. 1558 */ 1559 list_del_init(&p->ctl_entry); 1560 } 1561 1562 void sysctl_head_get(struct ctl_table_header *head) 1563 { 1564 spin_lock(&sysctl_lock); 1565 head->count++; 1566 spin_unlock(&sysctl_lock); 1567 } 1568 1569 void sysctl_head_put(struct ctl_table_header *head) 1570 { 1571 spin_lock(&sysctl_lock); 1572 if (!--head->count) 1573 kfree(head); 1574 spin_unlock(&sysctl_lock); 1575 } 1576 1577 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1578 { 1579 if (!head) 1580 BUG(); 1581 spin_lock(&sysctl_lock); 1582 if (!use_table(head)) 1583 head = ERR_PTR(-ENOENT); 1584 spin_unlock(&sysctl_lock); 1585 return head; 1586 } 1587 1588 void sysctl_head_finish(struct ctl_table_header *head) 1589 { 1590 if (!head) 1591 return; 1592 spin_lock(&sysctl_lock); 1593 unuse_table(head); 1594 spin_unlock(&sysctl_lock); 1595 } 1596 1597 static struct ctl_table_set * 1598 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1599 { 1600 struct ctl_table_set *set = &root->default_set; 1601 if (root->lookup) 1602 set = root->lookup(root, namespaces); 1603 return set; 1604 } 1605 1606 static struct list_head * 1607 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1608 { 1609 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1610 return &set->list; 1611 } 1612 1613 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1614 struct ctl_table_header *prev) 1615 { 1616 struct ctl_table_root *root; 1617 struct list_head *header_list; 1618 struct ctl_table_header *head; 1619 struct list_head *tmp; 1620 1621 spin_lock(&sysctl_lock); 1622 if (prev) { 1623 head = prev; 1624 tmp = &prev->ctl_entry; 1625 unuse_table(prev); 1626 goto next; 1627 } 1628 tmp = &root_table_header.ctl_entry; 1629 for (;;) { 1630 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1631 1632 if (!use_table(head)) 1633 goto next; 1634 spin_unlock(&sysctl_lock); 1635 return head; 1636 next: 1637 root = head->root; 1638 tmp = tmp->next; 1639 header_list = lookup_header_list(root, namespaces); 1640 if (tmp != header_list) 1641 continue; 1642 1643 do { 1644 root = list_entry(root->root_list.next, 1645 struct ctl_table_root, root_list); 1646 if (root == &sysctl_table_root) 1647 goto out; 1648 header_list = lookup_header_list(root, namespaces); 1649 } while (list_empty(header_list)); 1650 tmp = header_list->next; 1651 } 1652 out: 1653 spin_unlock(&sysctl_lock); 1654 return NULL; 1655 } 1656 1657 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1658 { 1659 return __sysctl_head_next(current->nsproxy, prev); 1660 } 1661 1662 void register_sysctl_root(struct ctl_table_root *root) 1663 { 1664 spin_lock(&sysctl_lock); 1665 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1666 spin_unlock(&sysctl_lock); 1667 } 1668 1669 /* 1670 * sysctl_perm does NOT grant the superuser all rights automatically, because 1671 * some sysctl variables are readonly even to root. 1672 */ 1673 1674 static int test_perm(int mode, int op) 1675 { 1676 if (!current_euid()) 1677 mode >>= 6; 1678 else if (in_egroup_p(0)) 1679 mode >>= 3; 1680 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1681 return 0; 1682 return -EACCES; 1683 } 1684 1685 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1686 { 1687 int error; 1688 int mode; 1689 1690 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1691 if (error) 1692 return error; 1693 1694 if (root->permissions) 1695 mode = root->permissions(root, current->nsproxy, table); 1696 else 1697 mode = table->mode; 1698 1699 return test_perm(mode, op); 1700 } 1701 1702 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1703 { 1704 for (; table->procname; table++) { 1705 table->parent = parent; 1706 if (table->child) 1707 sysctl_set_parent(table, table->child); 1708 } 1709 } 1710 1711 static __init int sysctl_init(void) 1712 { 1713 sysctl_set_parent(NULL, root_table); 1714 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1715 { 1716 int err; 1717 err = sysctl_check_table(current->nsproxy, root_table); 1718 } 1719 #endif 1720 return 0; 1721 } 1722 1723 core_initcall(sysctl_init); 1724 1725 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1726 struct ctl_table *table) 1727 { 1728 struct ctl_table *p; 1729 const char *s = branch->procname; 1730 1731 /* branch should have named subdirectory as its first element */ 1732 if (!s || !branch->child) 1733 return NULL; 1734 1735 /* ... and nothing else */ 1736 if (branch[1].procname) 1737 return NULL; 1738 1739 /* table should contain subdirectory with the same name */ 1740 for (p = table; p->procname; p++) { 1741 if (!p->child) 1742 continue; 1743 if (p->procname && strcmp(p->procname, s) == 0) 1744 return p; 1745 } 1746 return NULL; 1747 } 1748 1749 /* see if attaching q to p would be an improvement */ 1750 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1751 { 1752 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1753 struct ctl_table *next; 1754 int is_better = 0; 1755 int not_in_parent = !p->attached_by; 1756 1757 while ((next = is_branch_in(by, to)) != NULL) { 1758 if (by == q->attached_by) 1759 is_better = 1; 1760 if (to == p->attached_by) 1761 not_in_parent = 1; 1762 by = by->child; 1763 to = next->child; 1764 } 1765 1766 if (is_better && not_in_parent) { 1767 q->attached_by = by; 1768 q->attached_to = to; 1769 q->parent = p; 1770 } 1771 } 1772 1773 /** 1774 * __register_sysctl_paths - register a sysctl hierarchy 1775 * @root: List of sysctl headers to register on 1776 * @namespaces: Data to compute which lists of sysctl entries are visible 1777 * @path: The path to the directory the sysctl table is in. 1778 * @table: the top-level table structure 1779 * 1780 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1781 * array. A completely 0 filled entry terminates the table. 1782 * 1783 * The members of the &struct ctl_table structure are used as follows: 1784 * 1785 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1786 * enter a sysctl file 1787 * 1788 * data - a pointer to data for use by proc_handler 1789 * 1790 * maxlen - the maximum size in bytes of the data 1791 * 1792 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1793 * 1794 * child - a pointer to the child sysctl table if this entry is a directory, or 1795 * %NULL. 1796 * 1797 * proc_handler - the text handler routine (described below) 1798 * 1799 * de - for internal use by the sysctl routines 1800 * 1801 * extra1, extra2 - extra pointers usable by the proc handler routines 1802 * 1803 * Leaf nodes in the sysctl tree will be represented by a single file 1804 * under /proc; non-leaf nodes will be represented by directories. 1805 * 1806 * sysctl(2) can automatically manage read and write requests through 1807 * the sysctl table. The data and maxlen fields of the ctl_table 1808 * struct enable minimal validation of the values being written to be 1809 * performed, and the mode field allows minimal authentication. 1810 * 1811 * There must be a proc_handler routine for any terminal nodes 1812 * mirrored under /proc/sys (non-terminals are handled by a built-in 1813 * directory handler). Several default handlers are available to 1814 * cover common cases - 1815 * 1816 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1817 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1818 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1819 * 1820 * It is the handler's job to read the input buffer from user memory 1821 * and process it. The handler should return 0 on success. 1822 * 1823 * This routine returns %NULL on a failure to register, and a pointer 1824 * to the table header on success. 1825 */ 1826 struct ctl_table_header *__register_sysctl_paths( 1827 struct ctl_table_root *root, 1828 struct nsproxy *namespaces, 1829 const struct ctl_path *path, struct ctl_table *table) 1830 { 1831 struct ctl_table_header *header; 1832 struct ctl_table *new, **prevp; 1833 unsigned int n, npath; 1834 struct ctl_table_set *set; 1835 1836 /* Count the path components */ 1837 for (npath = 0; path[npath].procname; ++npath) 1838 ; 1839 1840 /* 1841 * For each path component, allocate a 2-element ctl_table array. 1842 * The first array element will be filled with the sysctl entry 1843 * for this, the second will be the sentinel (procname == 0). 1844 * 1845 * We allocate everything in one go so that we don't have to 1846 * worry about freeing additional memory in unregister_sysctl_table. 1847 */ 1848 header = kzalloc(sizeof(struct ctl_table_header) + 1849 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1850 if (!header) 1851 return NULL; 1852 1853 new = (struct ctl_table *) (header + 1); 1854 1855 /* Now connect the dots */ 1856 prevp = &header->ctl_table; 1857 for (n = 0; n < npath; ++n, ++path) { 1858 /* Copy the procname */ 1859 new->procname = path->procname; 1860 new->mode = 0555; 1861 1862 *prevp = new; 1863 prevp = &new->child; 1864 1865 new += 2; 1866 } 1867 *prevp = table; 1868 header->ctl_table_arg = table; 1869 1870 INIT_LIST_HEAD(&header->ctl_entry); 1871 header->used = 0; 1872 header->unregistering = NULL; 1873 header->root = root; 1874 sysctl_set_parent(NULL, header->ctl_table); 1875 header->count = 1; 1876 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1877 if (sysctl_check_table(namespaces, header->ctl_table)) { 1878 kfree(header); 1879 return NULL; 1880 } 1881 #endif 1882 spin_lock(&sysctl_lock); 1883 header->set = lookup_header_set(root, namespaces); 1884 header->attached_by = header->ctl_table; 1885 header->attached_to = root_table; 1886 header->parent = &root_table_header; 1887 for (set = header->set; set; set = set->parent) { 1888 struct ctl_table_header *p; 1889 list_for_each_entry(p, &set->list, ctl_entry) { 1890 if (p->unregistering) 1891 continue; 1892 try_attach(p, header); 1893 } 1894 } 1895 header->parent->count++; 1896 list_add_tail(&header->ctl_entry, &header->set->list); 1897 spin_unlock(&sysctl_lock); 1898 1899 return header; 1900 } 1901 1902 /** 1903 * register_sysctl_table_path - register a sysctl table hierarchy 1904 * @path: The path to the directory the sysctl table is in. 1905 * @table: the top-level table structure 1906 * 1907 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1908 * array. A completely 0 filled entry terminates the table. 1909 * 1910 * See __register_sysctl_paths for more details. 1911 */ 1912 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1913 struct ctl_table *table) 1914 { 1915 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1916 path, table); 1917 } 1918 1919 /** 1920 * register_sysctl_table - register a sysctl table hierarchy 1921 * @table: the top-level table structure 1922 * 1923 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1924 * array. A completely 0 filled entry terminates the table. 1925 * 1926 * See register_sysctl_paths for more details. 1927 */ 1928 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1929 { 1930 static const struct ctl_path null_path[] = { {} }; 1931 1932 return register_sysctl_paths(null_path, table); 1933 } 1934 1935 /** 1936 * unregister_sysctl_table - unregister a sysctl table hierarchy 1937 * @header: the header returned from register_sysctl_table 1938 * 1939 * Unregisters the sysctl table and all children. proc entries may not 1940 * actually be removed until they are no longer used by anyone. 1941 */ 1942 void unregister_sysctl_table(struct ctl_table_header * header) 1943 { 1944 might_sleep(); 1945 1946 if (header == NULL) 1947 return; 1948 1949 spin_lock(&sysctl_lock); 1950 start_unregistering(header); 1951 if (!--header->parent->count) { 1952 WARN_ON(1); 1953 kfree(header->parent); 1954 } 1955 if (!--header->count) 1956 kfree(header); 1957 spin_unlock(&sysctl_lock); 1958 } 1959 1960 int sysctl_is_seen(struct ctl_table_header *p) 1961 { 1962 struct ctl_table_set *set = p->set; 1963 int res; 1964 spin_lock(&sysctl_lock); 1965 if (p->unregistering) 1966 res = 0; 1967 else if (!set->is_seen) 1968 res = 1; 1969 else 1970 res = set->is_seen(set); 1971 spin_unlock(&sysctl_lock); 1972 return res; 1973 } 1974 1975 void setup_sysctl_set(struct ctl_table_set *p, 1976 struct ctl_table_set *parent, 1977 int (*is_seen)(struct ctl_table_set *)) 1978 { 1979 INIT_LIST_HEAD(&p->list); 1980 p->parent = parent ? parent : &sysctl_table_root.default_set; 1981 p->is_seen = is_seen; 1982 } 1983 1984 #else /* !CONFIG_SYSCTL */ 1985 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1986 { 1987 return NULL; 1988 } 1989 1990 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1991 struct ctl_table *table) 1992 { 1993 return NULL; 1994 } 1995 1996 void unregister_sysctl_table(struct ctl_table_header * table) 1997 { 1998 } 1999 2000 void setup_sysctl_set(struct ctl_table_set *p, 2001 struct ctl_table_set *parent, 2002 int (*is_seen)(struct ctl_table_set *)) 2003 { 2004 } 2005 2006 void sysctl_head_put(struct ctl_table_header *head) 2007 { 2008 } 2009 2010 #endif /* CONFIG_SYSCTL */ 2011 2012 /* 2013 * /proc/sys support 2014 */ 2015 2016 #ifdef CONFIG_PROC_SYSCTL 2017 2018 static int _proc_do_string(void* data, int maxlen, int write, 2019 void __user *buffer, 2020 size_t *lenp, loff_t *ppos) 2021 { 2022 size_t len; 2023 char __user *p; 2024 char c; 2025 2026 if (!data || !maxlen || !*lenp) { 2027 *lenp = 0; 2028 return 0; 2029 } 2030 2031 if (write) { 2032 len = 0; 2033 p = buffer; 2034 while (len < *lenp) { 2035 if (get_user(c, p++)) 2036 return -EFAULT; 2037 if (c == 0 || c == '\n') 2038 break; 2039 len++; 2040 } 2041 if (len >= maxlen) 2042 len = maxlen-1; 2043 if(copy_from_user(data, buffer, len)) 2044 return -EFAULT; 2045 ((char *) data)[len] = 0; 2046 *ppos += *lenp; 2047 } else { 2048 len = strlen(data); 2049 if (len > maxlen) 2050 len = maxlen; 2051 2052 if (*ppos > len) { 2053 *lenp = 0; 2054 return 0; 2055 } 2056 2057 data += *ppos; 2058 len -= *ppos; 2059 2060 if (len > *lenp) 2061 len = *lenp; 2062 if (len) 2063 if(copy_to_user(buffer, data, len)) 2064 return -EFAULT; 2065 if (len < *lenp) { 2066 if(put_user('\n', ((char __user *) buffer) + len)) 2067 return -EFAULT; 2068 len++; 2069 } 2070 *lenp = len; 2071 *ppos += len; 2072 } 2073 return 0; 2074 } 2075 2076 /** 2077 * proc_dostring - read a string sysctl 2078 * @table: the sysctl table 2079 * @write: %TRUE if this is a write to the sysctl file 2080 * @buffer: the user buffer 2081 * @lenp: the size of the user buffer 2082 * @ppos: file position 2083 * 2084 * Reads/writes a string from/to the user buffer. If the kernel 2085 * buffer provided is not large enough to hold the string, the 2086 * string is truncated. The copied string is %NULL-terminated. 2087 * If the string is being read by the user process, it is copied 2088 * and a newline '\n' is added. It is truncated if the buffer is 2089 * not large enough. 2090 * 2091 * Returns 0 on success. 2092 */ 2093 int proc_dostring(struct ctl_table *table, int write, 2094 void __user *buffer, size_t *lenp, loff_t *ppos) 2095 { 2096 return _proc_do_string(table->data, table->maxlen, write, 2097 buffer, lenp, ppos); 2098 } 2099 2100 static size_t proc_skip_spaces(char **buf) 2101 { 2102 size_t ret; 2103 char *tmp = skip_spaces(*buf); 2104 ret = tmp - *buf; 2105 *buf = tmp; 2106 return ret; 2107 } 2108 2109 static void proc_skip_char(char **buf, size_t *size, const char v) 2110 { 2111 while (*size) { 2112 if (**buf != v) 2113 break; 2114 (*size)--; 2115 (*buf)++; 2116 } 2117 } 2118 2119 #define TMPBUFLEN 22 2120 /** 2121 * proc_get_long - reads an ASCII formatted integer from a user buffer 2122 * 2123 * @buf: a kernel buffer 2124 * @size: size of the kernel buffer 2125 * @val: this is where the number will be stored 2126 * @neg: set to %TRUE if number is negative 2127 * @perm_tr: a vector which contains the allowed trailers 2128 * @perm_tr_len: size of the perm_tr vector 2129 * @tr: pointer to store the trailer character 2130 * 2131 * In case of success %0 is returned and @buf and @size are updated with 2132 * the amount of bytes read. If @tr is non-NULL and a trailing 2133 * character exists (size is non-zero after returning from this 2134 * function), @tr is updated with the trailing character. 2135 */ 2136 static int proc_get_long(char **buf, size_t *size, 2137 unsigned long *val, bool *neg, 2138 const char *perm_tr, unsigned perm_tr_len, char *tr) 2139 { 2140 int len; 2141 char *p, tmp[TMPBUFLEN]; 2142 2143 if (!*size) 2144 return -EINVAL; 2145 2146 len = *size; 2147 if (len > TMPBUFLEN - 1) 2148 len = TMPBUFLEN - 1; 2149 2150 memcpy(tmp, *buf, len); 2151 2152 tmp[len] = 0; 2153 p = tmp; 2154 if (*p == '-' && *size > 1) { 2155 *neg = true; 2156 p++; 2157 } else 2158 *neg = false; 2159 if (!isdigit(*p)) 2160 return -EINVAL; 2161 2162 *val = simple_strtoul(p, &p, 0); 2163 2164 len = p - tmp; 2165 2166 /* We don't know if the next char is whitespace thus we may accept 2167 * invalid integers (e.g. 1234...a) or two integers instead of one 2168 * (e.g. 123...1). So lets not allow such large numbers. */ 2169 if (len == TMPBUFLEN - 1) 2170 return -EINVAL; 2171 2172 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2173 return -EINVAL; 2174 2175 if (tr && (len < *size)) 2176 *tr = *p; 2177 2178 *buf += len; 2179 *size -= len; 2180 2181 return 0; 2182 } 2183 2184 /** 2185 * proc_put_long - converts an integer to a decimal ASCII formatted string 2186 * 2187 * @buf: the user buffer 2188 * @size: the size of the user buffer 2189 * @val: the integer to be converted 2190 * @neg: sign of the number, %TRUE for negative 2191 * 2192 * In case of success %0 is returned and @buf and @size are updated with 2193 * the amount of bytes written. 2194 */ 2195 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2196 bool neg) 2197 { 2198 int len; 2199 char tmp[TMPBUFLEN], *p = tmp; 2200 2201 sprintf(p, "%s%lu", neg ? "-" : "", val); 2202 len = strlen(tmp); 2203 if (len > *size) 2204 len = *size; 2205 if (copy_to_user(*buf, tmp, len)) 2206 return -EFAULT; 2207 *size -= len; 2208 *buf += len; 2209 return 0; 2210 } 2211 #undef TMPBUFLEN 2212 2213 static int proc_put_char(void __user **buf, size_t *size, char c) 2214 { 2215 if (*size) { 2216 char __user **buffer = (char __user **)buf; 2217 if (put_user(c, *buffer)) 2218 return -EFAULT; 2219 (*size)--, (*buffer)++; 2220 *buf = *buffer; 2221 } 2222 return 0; 2223 } 2224 2225 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2226 int *valp, 2227 int write, void *data) 2228 { 2229 if (write) { 2230 *valp = *negp ? -*lvalp : *lvalp; 2231 } else { 2232 int val = *valp; 2233 if (val < 0) { 2234 *negp = true; 2235 *lvalp = (unsigned long)-val; 2236 } else { 2237 *negp = false; 2238 *lvalp = (unsigned long)val; 2239 } 2240 } 2241 return 0; 2242 } 2243 2244 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2245 2246 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2247 int write, void __user *buffer, 2248 size_t *lenp, loff_t *ppos, 2249 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2250 int write, void *data), 2251 void *data) 2252 { 2253 int *i, vleft, first = 1, err = 0; 2254 unsigned long page = 0; 2255 size_t left; 2256 char *kbuf; 2257 2258 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2259 *lenp = 0; 2260 return 0; 2261 } 2262 2263 i = (int *) tbl_data; 2264 vleft = table->maxlen / sizeof(*i); 2265 left = *lenp; 2266 2267 if (!conv) 2268 conv = do_proc_dointvec_conv; 2269 2270 if (write) { 2271 if (left > PAGE_SIZE - 1) 2272 left = PAGE_SIZE - 1; 2273 page = __get_free_page(GFP_TEMPORARY); 2274 kbuf = (char *) page; 2275 if (!kbuf) 2276 return -ENOMEM; 2277 if (copy_from_user(kbuf, buffer, left)) { 2278 err = -EFAULT; 2279 goto free; 2280 } 2281 kbuf[left] = 0; 2282 } 2283 2284 for (; left && vleft--; i++, first=0) { 2285 unsigned long lval; 2286 bool neg; 2287 2288 if (write) { 2289 left -= proc_skip_spaces(&kbuf); 2290 2291 if (!left) 2292 break; 2293 err = proc_get_long(&kbuf, &left, &lval, &neg, 2294 proc_wspace_sep, 2295 sizeof(proc_wspace_sep), NULL); 2296 if (err) 2297 break; 2298 if (conv(&neg, &lval, i, 1, data)) { 2299 err = -EINVAL; 2300 break; 2301 } 2302 } else { 2303 if (conv(&neg, &lval, i, 0, data)) { 2304 err = -EINVAL; 2305 break; 2306 } 2307 if (!first) 2308 err = proc_put_char(&buffer, &left, '\t'); 2309 if (err) 2310 break; 2311 err = proc_put_long(&buffer, &left, lval, neg); 2312 if (err) 2313 break; 2314 } 2315 } 2316 2317 if (!write && !first && left && !err) 2318 err = proc_put_char(&buffer, &left, '\n'); 2319 if (write && !err && left) 2320 left -= proc_skip_spaces(&kbuf); 2321 free: 2322 if (write) { 2323 free_page(page); 2324 if (first) 2325 return err ? : -EINVAL; 2326 } 2327 *lenp -= left; 2328 *ppos += *lenp; 2329 return err; 2330 } 2331 2332 static int do_proc_dointvec(struct ctl_table *table, int write, 2333 void __user *buffer, size_t *lenp, loff_t *ppos, 2334 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2335 int write, void *data), 2336 void *data) 2337 { 2338 return __do_proc_dointvec(table->data, table, write, 2339 buffer, lenp, ppos, conv, data); 2340 } 2341 2342 /** 2343 * proc_dointvec - read a vector of integers 2344 * @table: the sysctl table 2345 * @write: %TRUE if this is a write to the sysctl file 2346 * @buffer: the user buffer 2347 * @lenp: the size of the user buffer 2348 * @ppos: file position 2349 * 2350 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2351 * values from/to the user buffer, treated as an ASCII string. 2352 * 2353 * Returns 0 on success. 2354 */ 2355 int proc_dointvec(struct ctl_table *table, int write, 2356 void __user *buffer, size_t *lenp, loff_t *ppos) 2357 { 2358 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2359 NULL,NULL); 2360 } 2361 2362 /* 2363 * Taint values can only be increased 2364 * This means we can safely use a temporary. 2365 */ 2366 static int proc_taint(struct ctl_table *table, int write, 2367 void __user *buffer, size_t *lenp, loff_t *ppos) 2368 { 2369 struct ctl_table t; 2370 unsigned long tmptaint = get_taint(); 2371 int err; 2372 2373 if (write && !capable(CAP_SYS_ADMIN)) 2374 return -EPERM; 2375 2376 t = *table; 2377 t.data = &tmptaint; 2378 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2379 if (err < 0) 2380 return err; 2381 2382 if (write) { 2383 /* 2384 * Poor man's atomic or. Not worth adding a primitive 2385 * to everyone's atomic.h for this 2386 */ 2387 int i; 2388 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2389 if ((tmptaint >> i) & 1) 2390 add_taint(i); 2391 } 2392 } 2393 2394 return err; 2395 } 2396 2397 struct do_proc_dointvec_minmax_conv_param { 2398 int *min; 2399 int *max; 2400 }; 2401 2402 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2403 int *valp, 2404 int write, void *data) 2405 { 2406 struct do_proc_dointvec_minmax_conv_param *param = data; 2407 if (write) { 2408 int val = *negp ? -*lvalp : *lvalp; 2409 if ((param->min && *param->min > val) || 2410 (param->max && *param->max < val)) 2411 return -EINVAL; 2412 *valp = val; 2413 } else { 2414 int val = *valp; 2415 if (val < 0) { 2416 *negp = true; 2417 *lvalp = (unsigned long)-val; 2418 } else { 2419 *negp = false; 2420 *lvalp = (unsigned long)val; 2421 } 2422 } 2423 return 0; 2424 } 2425 2426 /** 2427 * proc_dointvec_minmax - read a vector of integers with min/max values 2428 * @table: the sysctl table 2429 * @write: %TRUE if this is a write to the sysctl file 2430 * @buffer: the user buffer 2431 * @lenp: the size of the user buffer 2432 * @ppos: file position 2433 * 2434 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2435 * values from/to the user buffer, treated as an ASCII string. 2436 * 2437 * This routine will ensure the values are within the range specified by 2438 * table->extra1 (min) and table->extra2 (max). 2439 * 2440 * Returns 0 on success. 2441 */ 2442 int proc_dointvec_minmax(struct ctl_table *table, int write, 2443 void __user *buffer, size_t *lenp, loff_t *ppos) 2444 { 2445 struct do_proc_dointvec_minmax_conv_param param = { 2446 .min = (int *) table->extra1, 2447 .max = (int *) table->extra2, 2448 }; 2449 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2450 do_proc_dointvec_minmax_conv, ¶m); 2451 } 2452 2453 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2454 void __user *buffer, 2455 size_t *lenp, loff_t *ppos, 2456 unsigned long convmul, 2457 unsigned long convdiv) 2458 { 2459 unsigned long *i, *min, *max; 2460 int vleft, first = 1, err = 0; 2461 unsigned long page = 0; 2462 size_t left; 2463 char *kbuf; 2464 2465 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2466 *lenp = 0; 2467 return 0; 2468 } 2469 2470 i = (unsigned long *) data; 2471 min = (unsigned long *) table->extra1; 2472 max = (unsigned long *) table->extra2; 2473 vleft = table->maxlen / sizeof(unsigned long); 2474 left = *lenp; 2475 2476 if (write) { 2477 if (left > PAGE_SIZE - 1) 2478 left = PAGE_SIZE - 1; 2479 page = __get_free_page(GFP_TEMPORARY); 2480 kbuf = (char *) page; 2481 if (!kbuf) 2482 return -ENOMEM; 2483 if (copy_from_user(kbuf, buffer, left)) { 2484 err = -EFAULT; 2485 goto free; 2486 } 2487 kbuf[left] = 0; 2488 } 2489 2490 for (; left && vleft--; i++, min++, max++, first=0) { 2491 unsigned long val; 2492 2493 if (write) { 2494 bool neg; 2495 2496 left -= proc_skip_spaces(&kbuf); 2497 2498 err = proc_get_long(&kbuf, &left, &val, &neg, 2499 proc_wspace_sep, 2500 sizeof(proc_wspace_sep), NULL); 2501 if (err) 2502 break; 2503 if (neg) 2504 continue; 2505 if ((min && val < *min) || (max && val > *max)) 2506 continue; 2507 *i = val; 2508 } else { 2509 val = convdiv * (*i) / convmul; 2510 if (!first) 2511 err = proc_put_char(&buffer, &left, '\t'); 2512 err = proc_put_long(&buffer, &left, val, false); 2513 if (err) 2514 break; 2515 } 2516 } 2517 2518 if (!write && !first && left && !err) 2519 err = proc_put_char(&buffer, &left, '\n'); 2520 if (write && !err) 2521 left -= proc_skip_spaces(&kbuf); 2522 free: 2523 if (write) { 2524 free_page(page); 2525 if (first) 2526 return err ? : -EINVAL; 2527 } 2528 *lenp -= left; 2529 *ppos += *lenp; 2530 return err; 2531 } 2532 2533 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2534 void __user *buffer, 2535 size_t *lenp, loff_t *ppos, 2536 unsigned long convmul, 2537 unsigned long convdiv) 2538 { 2539 return __do_proc_doulongvec_minmax(table->data, table, write, 2540 buffer, lenp, ppos, convmul, convdiv); 2541 } 2542 2543 /** 2544 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2545 * @table: the sysctl table 2546 * @write: %TRUE if this is a write to the sysctl file 2547 * @buffer: the user buffer 2548 * @lenp: the size of the user buffer 2549 * @ppos: file position 2550 * 2551 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2552 * values from/to the user buffer, treated as an ASCII string. 2553 * 2554 * This routine will ensure the values are within the range specified by 2555 * table->extra1 (min) and table->extra2 (max). 2556 * 2557 * Returns 0 on success. 2558 */ 2559 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2560 void __user *buffer, size_t *lenp, loff_t *ppos) 2561 { 2562 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2563 } 2564 2565 /** 2566 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2567 * @table: the sysctl table 2568 * @write: %TRUE if this is a write to the sysctl file 2569 * @buffer: the user buffer 2570 * @lenp: the size of the user buffer 2571 * @ppos: file position 2572 * 2573 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2574 * values from/to the user buffer, treated as an ASCII string. The values 2575 * are treated as milliseconds, and converted to jiffies when they are stored. 2576 * 2577 * This routine will ensure the values are within the range specified by 2578 * table->extra1 (min) and table->extra2 (max). 2579 * 2580 * Returns 0 on success. 2581 */ 2582 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2583 void __user *buffer, 2584 size_t *lenp, loff_t *ppos) 2585 { 2586 return do_proc_doulongvec_minmax(table, write, buffer, 2587 lenp, ppos, HZ, 1000l); 2588 } 2589 2590 2591 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2592 int *valp, 2593 int write, void *data) 2594 { 2595 if (write) { 2596 if (*lvalp > LONG_MAX / HZ) 2597 return 1; 2598 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2599 } else { 2600 int val = *valp; 2601 unsigned long lval; 2602 if (val < 0) { 2603 *negp = true; 2604 lval = (unsigned long)-val; 2605 } else { 2606 *negp = false; 2607 lval = (unsigned long)val; 2608 } 2609 *lvalp = lval / HZ; 2610 } 2611 return 0; 2612 } 2613 2614 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2615 int *valp, 2616 int write, void *data) 2617 { 2618 if (write) { 2619 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2620 return 1; 2621 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2622 } else { 2623 int val = *valp; 2624 unsigned long lval; 2625 if (val < 0) { 2626 *negp = true; 2627 lval = (unsigned long)-val; 2628 } else { 2629 *negp = false; 2630 lval = (unsigned long)val; 2631 } 2632 *lvalp = jiffies_to_clock_t(lval); 2633 } 2634 return 0; 2635 } 2636 2637 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2638 int *valp, 2639 int write, void *data) 2640 { 2641 if (write) { 2642 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2643 } else { 2644 int val = *valp; 2645 unsigned long lval; 2646 if (val < 0) { 2647 *negp = true; 2648 lval = (unsigned long)-val; 2649 } else { 2650 *negp = false; 2651 lval = (unsigned long)val; 2652 } 2653 *lvalp = jiffies_to_msecs(lval); 2654 } 2655 return 0; 2656 } 2657 2658 /** 2659 * proc_dointvec_jiffies - read a vector of integers as seconds 2660 * @table: the sysctl table 2661 * @write: %TRUE if this is a write to the sysctl file 2662 * @buffer: the user buffer 2663 * @lenp: the size of the user buffer 2664 * @ppos: file position 2665 * 2666 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2667 * values from/to the user buffer, treated as an ASCII string. 2668 * The values read are assumed to be in seconds, and are converted into 2669 * jiffies. 2670 * 2671 * Returns 0 on success. 2672 */ 2673 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2674 void __user *buffer, size_t *lenp, loff_t *ppos) 2675 { 2676 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2677 do_proc_dointvec_jiffies_conv,NULL); 2678 } 2679 2680 /** 2681 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2682 * @table: the sysctl table 2683 * @write: %TRUE if this is a write to the sysctl file 2684 * @buffer: the user buffer 2685 * @lenp: the size of the user buffer 2686 * @ppos: pointer to the file position 2687 * 2688 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2689 * values from/to the user buffer, treated as an ASCII string. 2690 * The values read are assumed to be in 1/USER_HZ seconds, and 2691 * are converted into jiffies. 2692 * 2693 * Returns 0 on success. 2694 */ 2695 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2696 void __user *buffer, size_t *lenp, loff_t *ppos) 2697 { 2698 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2699 do_proc_dointvec_userhz_jiffies_conv,NULL); 2700 } 2701 2702 /** 2703 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2704 * @table: the sysctl table 2705 * @write: %TRUE if this is a write to the sysctl file 2706 * @buffer: the user buffer 2707 * @lenp: the size of the user buffer 2708 * @ppos: file position 2709 * @ppos: the current position in the file 2710 * 2711 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2712 * values from/to the user buffer, treated as an ASCII string. 2713 * The values read are assumed to be in 1/1000 seconds, and 2714 * are converted into jiffies. 2715 * 2716 * Returns 0 on success. 2717 */ 2718 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2719 void __user *buffer, size_t *lenp, loff_t *ppos) 2720 { 2721 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2722 do_proc_dointvec_ms_jiffies_conv, NULL); 2723 } 2724 2725 static int proc_do_cad_pid(struct ctl_table *table, int write, 2726 void __user *buffer, size_t *lenp, loff_t *ppos) 2727 { 2728 struct pid *new_pid; 2729 pid_t tmp; 2730 int r; 2731 2732 tmp = pid_vnr(cad_pid); 2733 2734 r = __do_proc_dointvec(&tmp, table, write, buffer, 2735 lenp, ppos, NULL, NULL); 2736 if (r || !write) 2737 return r; 2738 2739 new_pid = find_get_pid(tmp); 2740 if (!new_pid) 2741 return -ESRCH; 2742 2743 put_pid(xchg(&cad_pid, new_pid)); 2744 return 0; 2745 } 2746 2747 /** 2748 * proc_do_large_bitmap - read/write from/to a large bitmap 2749 * @table: the sysctl table 2750 * @write: %TRUE if this is a write to the sysctl file 2751 * @buffer: the user buffer 2752 * @lenp: the size of the user buffer 2753 * @ppos: file position 2754 * 2755 * The bitmap is stored at table->data and the bitmap length (in bits) 2756 * in table->maxlen. 2757 * 2758 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2759 * large bitmaps may be represented in a compact manner. Writing into 2760 * the file will clear the bitmap then update it with the given input. 2761 * 2762 * Returns 0 on success. 2763 */ 2764 int proc_do_large_bitmap(struct ctl_table *table, int write, 2765 void __user *buffer, size_t *lenp, loff_t *ppos) 2766 { 2767 int err = 0; 2768 bool first = 1; 2769 size_t left = *lenp; 2770 unsigned long bitmap_len = table->maxlen; 2771 unsigned long *bitmap = (unsigned long *) table->data; 2772 unsigned long *tmp_bitmap = NULL; 2773 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2774 2775 if (!bitmap_len || !left || (*ppos && !write)) { 2776 *lenp = 0; 2777 return 0; 2778 } 2779 2780 if (write) { 2781 unsigned long page = 0; 2782 char *kbuf; 2783 2784 if (left > PAGE_SIZE - 1) 2785 left = PAGE_SIZE - 1; 2786 2787 page = __get_free_page(GFP_TEMPORARY); 2788 kbuf = (char *) page; 2789 if (!kbuf) 2790 return -ENOMEM; 2791 if (copy_from_user(kbuf, buffer, left)) { 2792 free_page(page); 2793 return -EFAULT; 2794 } 2795 kbuf[left] = 0; 2796 2797 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2798 GFP_KERNEL); 2799 if (!tmp_bitmap) { 2800 free_page(page); 2801 return -ENOMEM; 2802 } 2803 proc_skip_char(&kbuf, &left, '\n'); 2804 while (!err && left) { 2805 unsigned long val_a, val_b; 2806 bool neg; 2807 2808 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2809 sizeof(tr_a), &c); 2810 if (err) 2811 break; 2812 if (val_a >= bitmap_len || neg) { 2813 err = -EINVAL; 2814 break; 2815 } 2816 2817 val_b = val_a; 2818 if (left) { 2819 kbuf++; 2820 left--; 2821 } 2822 2823 if (c == '-') { 2824 err = proc_get_long(&kbuf, &left, &val_b, 2825 &neg, tr_b, sizeof(tr_b), 2826 &c); 2827 if (err) 2828 break; 2829 if (val_b >= bitmap_len || neg || 2830 val_a > val_b) { 2831 err = -EINVAL; 2832 break; 2833 } 2834 if (left) { 2835 kbuf++; 2836 left--; 2837 } 2838 } 2839 2840 while (val_a <= val_b) 2841 set_bit(val_a++, tmp_bitmap); 2842 2843 first = 0; 2844 proc_skip_char(&kbuf, &left, '\n'); 2845 } 2846 free_page(page); 2847 } else { 2848 unsigned long bit_a, bit_b = 0; 2849 2850 while (left) { 2851 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2852 if (bit_a >= bitmap_len) 2853 break; 2854 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2855 bit_a + 1) - 1; 2856 2857 if (!first) { 2858 err = proc_put_char(&buffer, &left, ','); 2859 if (err) 2860 break; 2861 } 2862 err = proc_put_long(&buffer, &left, bit_a, false); 2863 if (err) 2864 break; 2865 if (bit_a != bit_b) { 2866 err = proc_put_char(&buffer, &left, '-'); 2867 if (err) 2868 break; 2869 err = proc_put_long(&buffer, &left, bit_b, false); 2870 if (err) 2871 break; 2872 } 2873 2874 first = 0; bit_b++; 2875 } 2876 if (!err) 2877 err = proc_put_char(&buffer, &left, '\n'); 2878 } 2879 2880 if (!err) { 2881 if (write) { 2882 if (*ppos) 2883 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2884 else 2885 memcpy(bitmap, tmp_bitmap, 2886 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2887 } 2888 kfree(tmp_bitmap); 2889 *lenp -= left; 2890 *ppos += *lenp; 2891 return 0; 2892 } else { 2893 kfree(tmp_bitmap); 2894 return err; 2895 } 2896 } 2897 2898 #else /* CONFIG_PROC_FS */ 2899 2900 int proc_dostring(struct ctl_table *table, int write, 2901 void __user *buffer, size_t *lenp, loff_t *ppos) 2902 { 2903 return -ENOSYS; 2904 } 2905 2906 int proc_dointvec(struct ctl_table *table, int write, 2907 void __user *buffer, size_t *lenp, loff_t *ppos) 2908 { 2909 return -ENOSYS; 2910 } 2911 2912 int proc_dointvec_minmax(struct ctl_table *table, int write, 2913 void __user *buffer, size_t *lenp, loff_t *ppos) 2914 { 2915 return -ENOSYS; 2916 } 2917 2918 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2919 void __user *buffer, size_t *lenp, loff_t *ppos) 2920 { 2921 return -ENOSYS; 2922 } 2923 2924 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2925 void __user *buffer, size_t *lenp, loff_t *ppos) 2926 { 2927 return -ENOSYS; 2928 } 2929 2930 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2931 void __user *buffer, size_t *lenp, loff_t *ppos) 2932 { 2933 return -ENOSYS; 2934 } 2935 2936 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2937 void __user *buffer, size_t *lenp, loff_t *ppos) 2938 { 2939 return -ENOSYS; 2940 } 2941 2942 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2943 void __user *buffer, 2944 size_t *lenp, loff_t *ppos) 2945 { 2946 return -ENOSYS; 2947 } 2948 2949 2950 #endif /* CONFIG_PROC_FS */ 2951 2952 /* 2953 * No sense putting this after each symbol definition, twice, 2954 * exception granted :-) 2955 */ 2956 EXPORT_SYMBOL(proc_dointvec); 2957 EXPORT_SYMBOL(proc_dointvec_jiffies); 2958 EXPORT_SYMBOL(proc_dointvec_minmax); 2959 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2960 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2961 EXPORT_SYMBOL(proc_dostring); 2962 EXPORT_SYMBOL(proc_doulongvec_minmax); 2963 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2964 EXPORT_SYMBOL(register_sysctl_table); 2965 EXPORT_SYMBOL(register_sysctl_paths); 2966 EXPORT_SYMBOL(unregister_sysctl_table); 2967