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