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 { 706 .procname = "dmesg_restrict", 707 .data = &dmesg_restrict, 708 .maxlen = sizeof(int), 709 .mode = 0644, 710 .proc_handler = proc_dointvec_minmax, 711 .extra1 = &zero, 712 .extra2 = &one, 713 }, 714 #endif 715 { 716 .procname = "ngroups_max", 717 .data = &ngroups_max, 718 .maxlen = sizeof (int), 719 .mode = 0444, 720 .proc_handler = proc_dointvec, 721 }, 722 #if defined(CONFIG_LOCKUP_DETECTOR) 723 { 724 .procname = "watchdog", 725 .data = &watchdog_enabled, 726 .maxlen = sizeof (int), 727 .mode = 0644, 728 .proc_handler = proc_dowatchdog_enabled, 729 }, 730 { 731 .procname = "watchdog_thresh", 732 .data = &softlockup_thresh, 733 .maxlen = sizeof(int), 734 .mode = 0644, 735 .proc_handler = proc_dowatchdog_thresh, 736 .extra1 = &neg_one, 737 .extra2 = &sixty, 738 }, 739 { 740 .procname = "softlockup_panic", 741 .data = &softlockup_panic, 742 .maxlen = sizeof(int), 743 .mode = 0644, 744 .proc_handler = proc_dointvec_minmax, 745 .extra1 = &zero, 746 .extra2 = &one, 747 }, 748 #endif 749 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR) 750 { 751 .procname = "unknown_nmi_panic", 752 .data = &unknown_nmi_panic, 753 .maxlen = sizeof (int), 754 .mode = 0644, 755 .proc_handler = proc_dointvec, 756 }, 757 { 758 .procname = "nmi_watchdog", 759 .data = &nmi_watchdog_enabled, 760 .maxlen = sizeof (int), 761 .mode = 0644, 762 .proc_handler = proc_nmi_enabled, 763 }, 764 #endif 765 #if defined(CONFIG_X86) 766 { 767 .procname = "panic_on_unrecovered_nmi", 768 .data = &panic_on_unrecovered_nmi, 769 .maxlen = sizeof(int), 770 .mode = 0644, 771 .proc_handler = proc_dointvec, 772 }, 773 { 774 .procname = "panic_on_io_nmi", 775 .data = &panic_on_io_nmi, 776 .maxlen = sizeof(int), 777 .mode = 0644, 778 .proc_handler = proc_dointvec, 779 }, 780 { 781 .procname = "bootloader_type", 782 .data = &bootloader_type, 783 .maxlen = sizeof (int), 784 .mode = 0444, 785 .proc_handler = proc_dointvec, 786 }, 787 { 788 .procname = "bootloader_version", 789 .data = &bootloader_version, 790 .maxlen = sizeof (int), 791 .mode = 0444, 792 .proc_handler = proc_dointvec, 793 }, 794 { 795 .procname = "kstack_depth_to_print", 796 .data = &kstack_depth_to_print, 797 .maxlen = sizeof(int), 798 .mode = 0644, 799 .proc_handler = proc_dointvec, 800 }, 801 { 802 .procname = "io_delay_type", 803 .data = &io_delay_type, 804 .maxlen = sizeof(int), 805 .mode = 0644, 806 .proc_handler = proc_dointvec, 807 }, 808 #endif 809 #if defined(CONFIG_MMU) 810 { 811 .procname = "randomize_va_space", 812 .data = &randomize_va_space, 813 .maxlen = sizeof(int), 814 .mode = 0644, 815 .proc_handler = proc_dointvec, 816 }, 817 #endif 818 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 819 { 820 .procname = "spin_retry", 821 .data = &spin_retry, 822 .maxlen = sizeof (int), 823 .mode = 0644, 824 .proc_handler = proc_dointvec, 825 }, 826 #endif 827 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 828 { 829 .procname = "acpi_video_flags", 830 .data = &acpi_realmode_flags, 831 .maxlen = sizeof (unsigned long), 832 .mode = 0644, 833 .proc_handler = proc_doulongvec_minmax, 834 }, 835 #endif 836 #ifdef CONFIG_IA64 837 { 838 .procname = "ignore-unaligned-usertrap", 839 .data = &no_unaligned_warning, 840 .maxlen = sizeof (int), 841 .mode = 0644, 842 .proc_handler = proc_dointvec, 843 }, 844 { 845 .procname = "unaligned-dump-stack", 846 .data = &unaligned_dump_stack, 847 .maxlen = sizeof (int), 848 .mode = 0644, 849 .proc_handler = proc_dointvec, 850 }, 851 #endif 852 #ifdef CONFIG_DETECT_HUNG_TASK 853 { 854 .procname = "hung_task_panic", 855 .data = &sysctl_hung_task_panic, 856 .maxlen = sizeof(int), 857 .mode = 0644, 858 .proc_handler = proc_dointvec_minmax, 859 .extra1 = &zero, 860 .extra2 = &one, 861 }, 862 { 863 .procname = "hung_task_check_count", 864 .data = &sysctl_hung_task_check_count, 865 .maxlen = sizeof(unsigned long), 866 .mode = 0644, 867 .proc_handler = proc_doulongvec_minmax, 868 }, 869 { 870 .procname = "hung_task_timeout_secs", 871 .data = &sysctl_hung_task_timeout_secs, 872 .maxlen = sizeof(unsigned long), 873 .mode = 0644, 874 .proc_handler = proc_dohung_task_timeout_secs, 875 }, 876 { 877 .procname = "hung_task_warnings", 878 .data = &sysctl_hung_task_warnings, 879 .maxlen = sizeof(unsigned long), 880 .mode = 0644, 881 .proc_handler = proc_doulongvec_minmax, 882 }, 883 #endif 884 #ifdef CONFIG_COMPAT 885 { 886 .procname = "compat-log", 887 .data = &compat_log, 888 .maxlen = sizeof (int), 889 .mode = 0644, 890 .proc_handler = proc_dointvec, 891 }, 892 #endif 893 #ifdef CONFIG_RT_MUTEXES 894 { 895 .procname = "max_lock_depth", 896 .data = &max_lock_depth, 897 .maxlen = sizeof(int), 898 .mode = 0644, 899 .proc_handler = proc_dointvec, 900 }, 901 #endif 902 { 903 .procname = "poweroff_cmd", 904 .data = &poweroff_cmd, 905 .maxlen = POWEROFF_CMD_PATH_LEN, 906 .mode = 0644, 907 .proc_handler = proc_dostring, 908 }, 909 #ifdef CONFIG_KEYS 910 { 911 .procname = "keys", 912 .mode = 0555, 913 .child = key_sysctls, 914 }, 915 #endif 916 #ifdef CONFIG_RCU_TORTURE_TEST 917 { 918 .procname = "rcutorture_runnable", 919 .data = &rcutorture_runnable, 920 .maxlen = sizeof(int), 921 .mode = 0644, 922 .proc_handler = proc_dointvec, 923 }, 924 #endif 925 #ifdef CONFIG_PERF_EVENTS 926 { 927 .procname = "perf_event_paranoid", 928 .data = &sysctl_perf_event_paranoid, 929 .maxlen = sizeof(sysctl_perf_event_paranoid), 930 .mode = 0644, 931 .proc_handler = proc_dointvec, 932 }, 933 { 934 .procname = "perf_event_mlock_kb", 935 .data = &sysctl_perf_event_mlock, 936 .maxlen = sizeof(sysctl_perf_event_mlock), 937 .mode = 0644, 938 .proc_handler = proc_dointvec, 939 }, 940 { 941 .procname = "perf_event_max_sample_rate", 942 .data = &sysctl_perf_event_sample_rate, 943 .maxlen = sizeof(sysctl_perf_event_sample_rate), 944 .mode = 0644, 945 .proc_handler = proc_dointvec, 946 }, 947 #endif 948 #ifdef CONFIG_KMEMCHECK 949 { 950 .procname = "kmemcheck", 951 .data = &kmemcheck_enabled, 952 .maxlen = sizeof(int), 953 .mode = 0644, 954 .proc_handler = proc_dointvec, 955 }, 956 #endif 957 #ifdef CONFIG_BLOCK 958 { 959 .procname = "blk_iopoll", 960 .data = &blk_iopoll_enabled, 961 .maxlen = sizeof(int), 962 .mode = 0644, 963 .proc_handler = proc_dointvec, 964 }, 965 #endif 966 /* 967 * NOTE: do not add new entries to this table unless you have read 968 * Documentation/sysctl/ctl_unnumbered.txt 969 */ 970 { } 971 }; 972 973 static struct ctl_table vm_table[] = { 974 { 975 .procname = "overcommit_memory", 976 .data = &sysctl_overcommit_memory, 977 .maxlen = sizeof(sysctl_overcommit_memory), 978 .mode = 0644, 979 .proc_handler = proc_dointvec, 980 }, 981 { 982 .procname = "panic_on_oom", 983 .data = &sysctl_panic_on_oom, 984 .maxlen = sizeof(sysctl_panic_on_oom), 985 .mode = 0644, 986 .proc_handler = proc_dointvec, 987 }, 988 { 989 .procname = "oom_kill_allocating_task", 990 .data = &sysctl_oom_kill_allocating_task, 991 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 992 .mode = 0644, 993 .proc_handler = proc_dointvec, 994 }, 995 { 996 .procname = "oom_dump_tasks", 997 .data = &sysctl_oom_dump_tasks, 998 .maxlen = sizeof(sysctl_oom_dump_tasks), 999 .mode = 0644, 1000 .proc_handler = proc_dointvec, 1001 }, 1002 { 1003 .procname = "overcommit_ratio", 1004 .data = &sysctl_overcommit_ratio, 1005 .maxlen = sizeof(sysctl_overcommit_ratio), 1006 .mode = 0644, 1007 .proc_handler = proc_dointvec, 1008 }, 1009 { 1010 .procname = "page-cluster", 1011 .data = &page_cluster, 1012 .maxlen = sizeof(int), 1013 .mode = 0644, 1014 .proc_handler = proc_dointvec, 1015 }, 1016 { 1017 .procname = "dirty_background_ratio", 1018 .data = &dirty_background_ratio, 1019 .maxlen = sizeof(dirty_background_ratio), 1020 .mode = 0644, 1021 .proc_handler = dirty_background_ratio_handler, 1022 .extra1 = &zero, 1023 .extra2 = &one_hundred, 1024 }, 1025 { 1026 .procname = "dirty_background_bytes", 1027 .data = &dirty_background_bytes, 1028 .maxlen = sizeof(dirty_background_bytes), 1029 .mode = 0644, 1030 .proc_handler = dirty_background_bytes_handler, 1031 .extra1 = &one_ul, 1032 }, 1033 { 1034 .procname = "dirty_ratio", 1035 .data = &vm_dirty_ratio, 1036 .maxlen = sizeof(vm_dirty_ratio), 1037 .mode = 0644, 1038 .proc_handler = dirty_ratio_handler, 1039 .extra1 = &zero, 1040 .extra2 = &one_hundred, 1041 }, 1042 { 1043 .procname = "dirty_bytes", 1044 .data = &vm_dirty_bytes, 1045 .maxlen = sizeof(vm_dirty_bytes), 1046 .mode = 0644, 1047 .proc_handler = dirty_bytes_handler, 1048 .extra1 = &dirty_bytes_min, 1049 }, 1050 { 1051 .procname = "dirty_writeback_centisecs", 1052 .data = &dirty_writeback_interval, 1053 .maxlen = sizeof(dirty_writeback_interval), 1054 .mode = 0644, 1055 .proc_handler = dirty_writeback_centisecs_handler, 1056 }, 1057 { 1058 .procname = "dirty_expire_centisecs", 1059 .data = &dirty_expire_interval, 1060 .maxlen = sizeof(dirty_expire_interval), 1061 .mode = 0644, 1062 .proc_handler = proc_dointvec, 1063 }, 1064 { 1065 .procname = "nr_pdflush_threads", 1066 .data = &nr_pdflush_threads, 1067 .maxlen = sizeof nr_pdflush_threads, 1068 .mode = 0444 /* read-only*/, 1069 .proc_handler = proc_dointvec, 1070 }, 1071 { 1072 .procname = "swappiness", 1073 .data = &vm_swappiness, 1074 .maxlen = sizeof(vm_swappiness), 1075 .mode = 0644, 1076 .proc_handler = proc_dointvec_minmax, 1077 .extra1 = &zero, 1078 .extra2 = &one_hundred, 1079 }, 1080 #ifdef CONFIG_HUGETLB_PAGE 1081 { 1082 .procname = "nr_hugepages", 1083 .data = NULL, 1084 .maxlen = sizeof(unsigned long), 1085 .mode = 0644, 1086 .proc_handler = hugetlb_sysctl_handler, 1087 .extra1 = (void *)&hugetlb_zero, 1088 .extra2 = (void *)&hugetlb_infinity, 1089 }, 1090 #ifdef CONFIG_NUMA 1091 { 1092 .procname = "nr_hugepages_mempolicy", 1093 .data = NULL, 1094 .maxlen = sizeof(unsigned long), 1095 .mode = 0644, 1096 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1097 .extra1 = (void *)&hugetlb_zero, 1098 .extra2 = (void *)&hugetlb_infinity, 1099 }, 1100 #endif 1101 { 1102 .procname = "hugetlb_shm_group", 1103 .data = &sysctl_hugetlb_shm_group, 1104 .maxlen = sizeof(gid_t), 1105 .mode = 0644, 1106 .proc_handler = proc_dointvec, 1107 }, 1108 { 1109 .procname = "hugepages_treat_as_movable", 1110 .data = &hugepages_treat_as_movable, 1111 .maxlen = sizeof(int), 1112 .mode = 0644, 1113 .proc_handler = hugetlb_treat_movable_handler, 1114 }, 1115 { 1116 .procname = "nr_overcommit_hugepages", 1117 .data = NULL, 1118 .maxlen = sizeof(unsigned long), 1119 .mode = 0644, 1120 .proc_handler = hugetlb_overcommit_handler, 1121 .extra1 = (void *)&hugetlb_zero, 1122 .extra2 = (void *)&hugetlb_infinity, 1123 }, 1124 #endif 1125 { 1126 .procname = "lowmem_reserve_ratio", 1127 .data = &sysctl_lowmem_reserve_ratio, 1128 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1129 .mode = 0644, 1130 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1131 }, 1132 { 1133 .procname = "drop_caches", 1134 .data = &sysctl_drop_caches, 1135 .maxlen = sizeof(int), 1136 .mode = 0644, 1137 .proc_handler = drop_caches_sysctl_handler, 1138 }, 1139 #ifdef CONFIG_COMPACTION 1140 { 1141 .procname = "compact_memory", 1142 .data = &sysctl_compact_memory, 1143 .maxlen = sizeof(int), 1144 .mode = 0200, 1145 .proc_handler = sysctl_compaction_handler, 1146 }, 1147 { 1148 .procname = "extfrag_threshold", 1149 .data = &sysctl_extfrag_threshold, 1150 .maxlen = sizeof(int), 1151 .mode = 0644, 1152 .proc_handler = sysctl_extfrag_handler, 1153 .extra1 = &min_extfrag_threshold, 1154 .extra2 = &max_extfrag_threshold, 1155 }, 1156 1157 #endif /* CONFIG_COMPACTION */ 1158 { 1159 .procname = "min_free_kbytes", 1160 .data = &min_free_kbytes, 1161 .maxlen = sizeof(min_free_kbytes), 1162 .mode = 0644, 1163 .proc_handler = min_free_kbytes_sysctl_handler, 1164 .extra1 = &zero, 1165 }, 1166 { 1167 .procname = "percpu_pagelist_fraction", 1168 .data = &percpu_pagelist_fraction, 1169 .maxlen = sizeof(percpu_pagelist_fraction), 1170 .mode = 0644, 1171 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1172 .extra1 = &min_percpu_pagelist_fract, 1173 }, 1174 #ifdef CONFIG_MMU 1175 { 1176 .procname = "max_map_count", 1177 .data = &sysctl_max_map_count, 1178 .maxlen = sizeof(sysctl_max_map_count), 1179 .mode = 0644, 1180 .proc_handler = proc_dointvec_minmax, 1181 .extra1 = &zero, 1182 }, 1183 #else 1184 { 1185 .procname = "nr_trim_pages", 1186 .data = &sysctl_nr_trim_pages, 1187 .maxlen = sizeof(sysctl_nr_trim_pages), 1188 .mode = 0644, 1189 .proc_handler = proc_dointvec_minmax, 1190 .extra1 = &zero, 1191 }, 1192 #endif 1193 { 1194 .procname = "laptop_mode", 1195 .data = &laptop_mode, 1196 .maxlen = sizeof(laptop_mode), 1197 .mode = 0644, 1198 .proc_handler = proc_dointvec_jiffies, 1199 }, 1200 { 1201 .procname = "block_dump", 1202 .data = &block_dump, 1203 .maxlen = sizeof(block_dump), 1204 .mode = 0644, 1205 .proc_handler = proc_dointvec, 1206 .extra1 = &zero, 1207 }, 1208 { 1209 .procname = "vfs_cache_pressure", 1210 .data = &sysctl_vfs_cache_pressure, 1211 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1212 .mode = 0644, 1213 .proc_handler = proc_dointvec, 1214 .extra1 = &zero, 1215 }, 1216 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1217 { 1218 .procname = "legacy_va_layout", 1219 .data = &sysctl_legacy_va_layout, 1220 .maxlen = sizeof(sysctl_legacy_va_layout), 1221 .mode = 0644, 1222 .proc_handler = proc_dointvec, 1223 .extra1 = &zero, 1224 }, 1225 #endif 1226 #ifdef CONFIG_NUMA 1227 { 1228 .procname = "zone_reclaim_mode", 1229 .data = &zone_reclaim_mode, 1230 .maxlen = sizeof(zone_reclaim_mode), 1231 .mode = 0644, 1232 .proc_handler = proc_dointvec, 1233 .extra1 = &zero, 1234 }, 1235 { 1236 .procname = "min_unmapped_ratio", 1237 .data = &sysctl_min_unmapped_ratio, 1238 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1239 .mode = 0644, 1240 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1241 .extra1 = &zero, 1242 .extra2 = &one_hundred, 1243 }, 1244 { 1245 .procname = "min_slab_ratio", 1246 .data = &sysctl_min_slab_ratio, 1247 .maxlen = sizeof(sysctl_min_slab_ratio), 1248 .mode = 0644, 1249 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1250 .extra1 = &zero, 1251 .extra2 = &one_hundred, 1252 }, 1253 #endif 1254 #ifdef CONFIG_SMP 1255 { 1256 .procname = "stat_interval", 1257 .data = &sysctl_stat_interval, 1258 .maxlen = sizeof(sysctl_stat_interval), 1259 .mode = 0644, 1260 .proc_handler = proc_dointvec_jiffies, 1261 }, 1262 #endif 1263 #ifdef CONFIG_MMU 1264 { 1265 .procname = "mmap_min_addr", 1266 .data = &dac_mmap_min_addr, 1267 .maxlen = sizeof(unsigned long), 1268 .mode = 0644, 1269 .proc_handler = mmap_min_addr_handler, 1270 }, 1271 #endif 1272 #ifdef CONFIG_NUMA 1273 { 1274 .procname = "numa_zonelist_order", 1275 .data = &numa_zonelist_order, 1276 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1277 .mode = 0644, 1278 .proc_handler = numa_zonelist_order_handler, 1279 }, 1280 #endif 1281 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1282 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1283 { 1284 .procname = "vdso_enabled", 1285 .data = &vdso_enabled, 1286 .maxlen = sizeof(vdso_enabled), 1287 .mode = 0644, 1288 .proc_handler = proc_dointvec, 1289 .extra1 = &zero, 1290 }, 1291 #endif 1292 #ifdef CONFIG_HIGHMEM 1293 { 1294 .procname = "highmem_is_dirtyable", 1295 .data = &vm_highmem_is_dirtyable, 1296 .maxlen = sizeof(vm_highmem_is_dirtyable), 1297 .mode = 0644, 1298 .proc_handler = proc_dointvec_minmax, 1299 .extra1 = &zero, 1300 .extra2 = &one, 1301 }, 1302 #endif 1303 { 1304 .procname = "scan_unevictable_pages", 1305 .data = &scan_unevictable_pages, 1306 .maxlen = sizeof(scan_unevictable_pages), 1307 .mode = 0644, 1308 .proc_handler = scan_unevictable_handler, 1309 }, 1310 #ifdef CONFIG_MEMORY_FAILURE 1311 { 1312 .procname = "memory_failure_early_kill", 1313 .data = &sysctl_memory_failure_early_kill, 1314 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1315 .mode = 0644, 1316 .proc_handler = proc_dointvec_minmax, 1317 .extra1 = &zero, 1318 .extra2 = &one, 1319 }, 1320 { 1321 .procname = "memory_failure_recovery", 1322 .data = &sysctl_memory_failure_recovery, 1323 .maxlen = sizeof(sysctl_memory_failure_recovery), 1324 .mode = 0644, 1325 .proc_handler = proc_dointvec_minmax, 1326 .extra1 = &zero, 1327 .extra2 = &one, 1328 }, 1329 #endif 1330 1331 /* 1332 * NOTE: do not add new entries to this table unless you have read 1333 * Documentation/sysctl/ctl_unnumbered.txt 1334 */ 1335 { } 1336 }; 1337 1338 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1339 static struct ctl_table binfmt_misc_table[] = { 1340 { } 1341 }; 1342 #endif 1343 1344 static struct ctl_table fs_table[] = { 1345 { 1346 .procname = "inode-nr", 1347 .data = &inodes_stat, 1348 .maxlen = 2*sizeof(int), 1349 .mode = 0444, 1350 .proc_handler = proc_nr_inodes, 1351 }, 1352 { 1353 .procname = "inode-state", 1354 .data = &inodes_stat, 1355 .maxlen = 7*sizeof(int), 1356 .mode = 0444, 1357 .proc_handler = proc_nr_inodes, 1358 }, 1359 { 1360 .procname = "file-nr", 1361 .data = &files_stat, 1362 .maxlen = sizeof(files_stat), 1363 .mode = 0444, 1364 .proc_handler = proc_nr_files, 1365 }, 1366 { 1367 .procname = "file-max", 1368 .data = &files_stat.max_files, 1369 .maxlen = sizeof(files_stat.max_files), 1370 .mode = 0644, 1371 .proc_handler = proc_doulongvec_minmax, 1372 }, 1373 { 1374 .procname = "nr_open", 1375 .data = &sysctl_nr_open, 1376 .maxlen = sizeof(int), 1377 .mode = 0644, 1378 .proc_handler = proc_dointvec_minmax, 1379 .extra1 = &sysctl_nr_open_min, 1380 .extra2 = &sysctl_nr_open_max, 1381 }, 1382 { 1383 .procname = "dentry-state", 1384 .data = &dentry_stat, 1385 .maxlen = 6*sizeof(int), 1386 .mode = 0444, 1387 .proc_handler = proc_nr_dentry, 1388 }, 1389 { 1390 .procname = "overflowuid", 1391 .data = &fs_overflowuid, 1392 .maxlen = sizeof(int), 1393 .mode = 0644, 1394 .proc_handler = proc_dointvec_minmax, 1395 .extra1 = &minolduid, 1396 .extra2 = &maxolduid, 1397 }, 1398 { 1399 .procname = "overflowgid", 1400 .data = &fs_overflowgid, 1401 .maxlen = sizeof(int), 1402 .mode = 0644, 1403 .proc_handler = proc_dointvec_minmax, 1404 .extra1 = &minolduid, 1405 .extra2 = &maxolduid, 1406 }, 1407 #ifdef CONFIG_FILE_LOCKING 1408 { 1409 .procname = "leases-enable", 1410 .data = &leases_enable, 1411 .maxlen = sizeof(int), 1412 .mode = 0644, 1413 .proc_handler = proc_dointvec, 1414 }, 1415 #endif 1416 #ifdef CONFIG_DNOTIFY 1417 { 1418 .procname = "dir-notify-enable", 1419 .data = &dir_notify_enable, 1420 .maxlen = sizeof(int), 1421 .mode = 0644, 1422 .proc_handler = proc_dointvec, 1423 }, 1424 #endif 1425 #ifdef CONFIG_MMU 1426 #ifdef CONFIG_FILE_LOCKING 1427 { 1428 .procname = "lease-break-time", 1429 .data = &lease_break_time, 1430 .maxlen = sizeof(int), 1431 .mode = 0644, 1432 .proc_handler = proc_dointvec, 1433 }, 1434 #endif 1435 #ifdef CONFIG_AIO 1436 { 1437 .procname = "aio-nr", 1438 .data = &aio_nr, 1439 .maxlen = sizeof(aio_nr), 1440 .mode = 0444, 1441 .proc_handler = proc_doulongvec_minmax, 1442 }, 1443 { 1444 .procname = "aio-max-nr", 1445 .data = &aio_max_nr, 1446 .maxlen = sizeof(aio_max_nr), 1447 .mode = 0644, 1448 .proc_handler = proc_doulongvec_minmax, 1449 }, 1450 #endif /* CONFIG_AIO */ 1451 #ifdef CONFIG_INOTIFY_USER 1452 { 1453 .procname = "inotify", 1454 .mode = 0555, 1455 .child = inotify_table, 1456 }, 1457 #endif 1458 #ifdef CONFIG_EPOLL 1459 { 1460 .procname = "epoll", 1461 .mode = 0555, 1462 .child = epoll_table, 1463 }, 1464 #endif 1465 #endif 1466 { 1467 .procname = "suid_dumpable", 1468 .data = &suid_dumpable, 1469 .maxlen = sizeof(int), 1470 .mode = 0644, 1471 .proc_handler = proc_dointvec_minmax, 1472 .extra1 = &zero, 1473 .extra2 = &two, 1474 }, 1475 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1476 { 1477 .procname = "binfmt_misc", 1478 .mode = 0555, 1479 .child = binfmt_misc_table, 1480 }, 1481 #endif 1482 { 1483 .procname = "pipe-max-size", 1484 .data = &pipe_max_size, 1485 .maxlen = sizeof(int), 1486 .mode = 0644, 1487 .proc_handler = &pipe_proc_fn, 1488 .extra1 = &pipe_min_size, 1489 }, 1490 /* 1491 * NOTE: do not add new entries to this table unless you have read 1492 * Documentation/sysctl/ctl_unnumbered.txt 1493 */ 1494 { } 1495 }; 1496 1497 static struct ctl_table debug_table[] = { 1498 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1499 defined(CONFIG_S390) 1500 { 1501 .procname = "exception-trace", 1502 .data = &show_unhandled_signals, 1503 .maxlen = sizeof(int), 1504 .mode = 0644, 1505 .proc_handler = proc_dointvec 1506 }, 1507 #endif 1508 #if defined(CONFIG_OPTPROBES) 1509 { 1510 .procname = "kprobes-optimization", 1511 .data = &sysctl_kprobes_optimization, 1512 .maxlen = sizeof(int), 1513 .mode = 0644, 1514 .proc_handler = proc_kprobes_optimization_handler, 1515 .extra1 = &zero, 1516 .extra2 = &one, 1517 }, 1518 #endif 1519 { } 1520 }; 1521 1522 static struct ctl_table dev_table[] = { 1523 { } 1524 }; 1525 1526 static DEFINE_SPINLOCK(sysctl_lock); 1527 1528 /* called under sysctl_lock */ 1529 static int use_table(struct ctl_table_header *p) 1530 { 1531 if (unlikely(p->unregistering)) 1532 return 0; 1533 p->used++; 1534 return 1; 1535 } 1536 1537 /* called under sysctl_lock */ 1538 static void unuse_table(struct ctl_table_header *p) 1539 { 1540 if (!--p->used) 1541 if (unlikely(p->unregistering)) 1542 complete(p->unregistering); 1543 } 1544 1545 /* called under sysctl_lock, will reacquire if has to wait */ 1546 static void start_unregistering(struct ctl_table_header *p) 1547 { 1548 /* 1549 * if p->used is 0, nobody will ever touch that entry again; 1550 * we'll eliminate all paths to it before dropping sysctl_lock 1551 */ 1552 if (unlikely(p->used)) { 1553 struct completion wait; 1554 init_completion(&wait); 1555 p->unregistering = &wait; 1556 spin_unlock(&sysctl_lock); 1557 wait_for_completion(&wait); 1558 spin_lock(&sysctl_lock); 1559 } else { 1560 /* anything non-NULL; we'll never dereference it */ 1561 p->unregistering = ERR_PTR(-EINVAL); 1562 } 1563 /* 1564 * do not remove from the list until nobody holds it; walking the 1565 * list in do_sysctl() relies on that. 1566 */ 1567 list_del_init(&p->ctl_entry); 1568 } 1569 1570 void sysctl_head_get(struct ctl_table_header *head) 1571 { 1572 spin_lock(&sysctl_lock); 1573 head->count++; 1574 spin_unlock(&sysctl_lock); 1575 } 1576 1577 void sysctl_head_put(struct ctl_table_header *head) 1578 { 1579 spin_lock(&sysctl_lock); 1580 if (!--head->count) 1581 kfree(head); 1582 spin_unlock(&sysctl_lock); 1583 } 1584 1585 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1586 { 1587 if (!head) 1588 BUG(); 1589 spin_lock(&sysctl_lock); 1590 if (!use_table(head)) 1591 head = ERR_PTR(-ENOENT); 1592 spin_unlock(&sysctl_lock); 1593 return head; 1594 } 1595 1596 void sysctl_head_finish(struct ctl_table_header *head) 1597 { 1598 if (!head) 1599 return; 1600 spin_lock(&sysctl_lock); 1601 unuse_table(head); 1602 spin_unlock(&sysctl_lock); 1603 } 1604 1605 static struct ctl_table_set * 1606 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1607 { 1608 struct ctl_table_set *set = &root->default_set; 1609 if (root->lookup) 1610 set = root->lookup(root, namespaces); 1611 return set; 1612 } 1613 1614 static struct list_head * 1615 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1616 { 1617 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1618 return &set->list; 1619 } 1620 1621 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1622 struct ctl_table_header *prev) 1623 { 1624 struct ctl_table_root *root; 1625 struct list_head *header_list; 1626 struct ctl_table_header *head; 1627 struct list_head *tmp; 1628 1629 spin_lock(&sysctl_lock); 1630 if (prev) { 1631 head = prev; 1632 tmp = &prev->ctl_entry; 1633 unuse_table(prev); 1634 goto next; 1635 } 1636 tmp = &root_table_header.ctl_entry; 1637 for (;;) { 1638 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1639 1640 if (!use_table(head)) 1641 goto next; 1642 spin_unlock(&sysctl_lock); 1643 return head; 1644 next: 1645 root = head->root; 1646 tmp = tmp->next; 1647 header_list = lookup_header_list(root, namespaces); 1648 if (tmp != header_list) 1649 continue; 1650 1651 do { 1652 root = list_entry(root->root_list.next, 1653 struct ctl_table_root, root_list); 1654 if (root == &sysctl_table_root) 1655 goto out; 1656 header_list = lookup_header_list(root, namespaces); 1657 } while (list_empty(header_list)); 1658 tmp = header_list->next; 1659 } 1660 out: 1661 spin_unlock(&sysctl_lock); 1662 return NULL; 1663 } 1664 1665 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1666 { 1667 return __sysctl_head_next(current->nsproxy, prev); 1668 } 1669 1670 void register_sysctl_root(struct ctl_table_root *root) 1671 { 1672 spin_lock(&sysctl_lock); 1673 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1674 spin_unlock(&sysctl_lock); 1675 } 1676 1677 /* 1678 * sysctl_perm does NOT grant the superuser all rights automatically, because 1679 * some sysctl variables are readonly even to root. 1680 */ 1681 1682 static int test_perm(int mode, int op) 1683 { 1684 if (!current_euid()) 1685 mode >>= 6; 1686 else if (in_egroup_p(0)) 1687 mode >>= 3; 1688 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1689 return 0; 1690 return -EACCES; 1691 } 1692 1693 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1694 { 1695 int error; 1696 int mode; 1697 1698 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1699 if (error) 1700 return error; 1701 1702 if (root->permissions) 1703 mode = root->permissions(root, current->nsproxy, table); 1704 else 1705 mode = table->mode; 1706 1707 return test_perm(mode, op); 1708 } 1709 1710 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1711 { 1712 for (; table->procname; table++) { 1713 table->parent = parent; 1714 if (table->child) 1715 sysctl_set_parent(table, table->child); 1716 } 1717 } 1718 1719 static __init int sysctl_init(void) 1720 { 1721 sysctl_set_parent(NULL, root_table); 1722 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1723 sysctl_check_table(current->nsproxy, root_table); 1724 #endif 1725 return 0; 1726 } 1727 1728 core_initcall(sysctl_init); 1729 1730 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1731 struct ctl_table *table) 1732 { 1733 struct ctl_table *p; 1734 const char *s = branch->procname; 1735 1736 /* branch should have named subdirectory as its first element */ 1737 if (!s || !branch->child) 1738 return NULL; 1739 1740 /* ... and nothing else */ 1741 if (branch[1].procname) 1742 return NULL; 1743 1744 /* table should contain subdirectory with the same name */ 1745 for (p = table; p->procname; p++) { 1746 if (!p->child) 1747 continue; 1748 if (p->procname && strcmp(p->procname, s) == 0) 1749 return p; 1750 } 1751 return NULL; 1752 } 1753 1754 /* see if attaching q to p would be an improvement */ 1755 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1756 { 1757 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1758 struct ctl_table *next; 1759 int is_better = 0; 1760 int not_in_parent = !p->attached_by; 1761 1762 while ((next = is_branch_in(by, to)) != NULL) { 1763 if (by == q->attached_by) 1764 is_better = 1; 1765 if (to == p->attached_by) 1766 not_in_parent = 1; 1767 by = by->child; 1768 to = next->child; 1769 } 1770 1771 if (is_better && not_in_parent) { 1772 q->attached_by = by; 1773 q->attached_to = to; 1774 q->parent = p; 1775 } 1776 } 1777 1778 /** 1779 * __register_sysctl_paths - register a sysctl hierarchy 1780 * @root: List of sysctl headers to register on 1781 * @namespaces: Data to compute which lists of sysctl entries are visible 1782 * @path: The path to the directory the sysctl table is in. 1783 * @table: the top-level table structure 1784 * 1785 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1786 * array. A completely 0 filled entry terminates the table. 1787 * 1788 * The members of the &struct ctl_table structure are used as follows: 1789 * 1790 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1791 * enter a sysctl file 1792 * 1793 * data - a pointer to data for use by proc_handler 1794 * 1795 * maxlen - the maximum size in bytes of the data 1796 * 1797 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1798 * 1799 * child - a pointer to the child sysctl table if this entry is a directory, or 1800 * %NULL. 1801 * 1802 * proc_handler - the text handler routine (described below) 1803 * 1804 * de - for internal use by the sysctl routines 1805 * 1806 * extra1, extra2 - extra pointers usable by the proc handler routines 1807 * 1808 * Leaf nodes in the sysctl tree will be represented by a single file 1809 * under /proc; non-leaf nodes will be represented by directories. 1810 * 1811 * sysctl(2) can automatically manage read and write requests through 1812 * the sysctl table. The data and maxlen fields of the ctl_table 1813 * struct enable minimal validation of the values being written to be 1814 * performed, and the mode field allows minimal authentication. 1815 * 1816 * There must be a proc_handler routine for any terminal nodes 1817 * mirrored under /proc/sys (non-terminals are handled by a built-in 1818 * directory handler). Several default handlers are available to 1819 * cover common cases - 1820 * 1821 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1822 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1823 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1824 * 1825 * It is the handler's job to read the input buffer from user memory 1826 * and process it. The handler should return 0 on success. 1827 * 1828 * This routine returns %NULL on a failure to register, and a pointer 1829 * to the table header on success. 1830 */ 1831 struct ctl_table_header *__register_sysctl_paths( 1832 struct ctl_table_root *root, 1833 struct nsproxy *namespaces, 1834 const struct ctl_path *path, struct ctl_table *table) 1835 { 1836 struct ctl_table_header *header; 1837 struct ctl_table *new, **prevp; 1838 unsigned int n, npath; 1839 struct ctl_table_set *set; 1840 1841 /* Count the path components */ 1842 for (npath = 0; path[npath].procname; ++npath) 1843 ; 1844 1845 /* 1846 * For each path component, allocate a 2-element ctl_table array. 1847 * The first array element will be filled with the sysctl entry 1848 * for this, the second will be the sentinel (procname == 0). 1849 * 1850 * We allocate everything in one go so that we don't have to 1851 * worry about freeing additional memory in unregister_sysctl_table. 1852 */ 1853 header = kzalloc(sizeof(struct ctl_table_header) + 1854 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1855 if (!header) 1856 return NULL; 1857 1858 new = (struct ctl_table *) (header + 1); 1859 1860 /* Now connect the dots */ 1861 prevp = &header->ctl_table; 1862 for (n = 0; n < npath; ++n, ++path) { 1863 /* Copy the procname */ 1864 new->procname = path->procname; 1865 new->mode = 0555; 1866 1867 *prevp = new; 1868 prevp = &new->child; 1869 1870 new += 2; 1871 } 1872 *prevp = table; 1873 header->ctl_table_arg = table; 1874 1875 INIT_LIST_HEAD(&header->ctl_entry); 1876 header->used = 0; 1877 header->unregistering = NULL; 1878 header->root = root; 1879 sysctl_set_parent(NULL, header->ctl_table); 1880 header->count = 1; 1881 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1882 if (sysctl_check_table(namespaces, header->ctl_table)) { 1883 kfree(header); 1884 return NULL; 1885 } 1886 #endif 1887 spin_lock(&sysctl_lock); 1888 header->set = lookup_header_set(root, namespaces); 1889 header->attached_by = header->ctl_table; 1890 header->attached_to = root_table; 1891 header->parent = &root_table_header; 1892 for (set = header->set; set; set = set->parent) { 1893 struct ctl_table_header *p; 1894 list_for_each_entry(p, &set->list, ctl_entry) { 1895 if (p->unregistering) 1896 continue; 1897 try_attach(p, header); 1898 } 1899 } 1900 header->parent->count++; 1901 list_add_tail(&header->ctl_entry, &header->set->list); 1902 spin_unlock(&sysctl_lock); 1903 1904 return header; 1905 } 1906 1907 /** 1908 * register_sysctl_table_path - register a sysctl table hierarchy 1909 * @path: The path to the directory the sysctl table is in. 1910 * @table: the top-level table structure 1911 * 1912 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1913 * array. A completely 0 filled entry terminates the table. 1914 * 1915 * See __register_sysctl_paths for more details. 1916 */ 1917 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1918 struct ctl_table *table) 1919 { 1920 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1921 path, table); 1922 } 1923 1924 /** 1925 * register_sysctl_table - register a sysctl table hierarchy 1926 * @table: the top-level table structure 1927 * 1928 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1929 * array. A completely 0 filled entry terminates the table. 1930 * 1931 * See register_sysctl_paths for more details. 1932 */ 1933 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1934 { 1935 static const struct ctl_path null_path[] = { {} }; 1936 1937 return register_sysctl_paths(null_path, table); 1938 } 1939 1940 /** 1941 * unregister_sysctl_table - unregister a sysctl table hierarchy 1942 * @header: the header returned from register_sysctl_table 1943 * 1944 * Unregisters the sysctl table and all children. proc entries may not 1945 * actually be removed until they are no longer used by anyone. 1946 */ 1947 void unregister_sysctl_table(struct ctl_table_header * header) 1948 { 1949 might_sleep(); 1950 1951 if (header == NULL) 1952 return; 1953 1954 spin_lock(&sysctl_lock); 1955 start_unregistering(header); 1956 if (!--header->parent->count) { 1957 WARN_ON(1); 1958 kfree(header->parent); 1959 } 1960 if (!--header->count) 1961 kfree(header); 1962 spin_unlock(&sysctl_lock); 1963 } 1964 1965 int sysctl_is_seen(struct ctl_table_header *p) 1966 { 1967 struct ctl_table_set *set = p->set; 1968 int res; 1969 spin_lock(&sysctl_lock); 1970 if (p->unregistering) 1971 res = 0; 1972 else if (!set->is_seen) 1973 res = 1; 1974 else 1975 res = set->is_seen(set); 1976 spin_unlock(&sysctl_lock); 1977 return res; 1978 } 1979 1980 void setup_sysctl_set(struct ctl_table_set *p, 1981 struct ctl_table_set *parent, 1982 int (*is_seen)(struct ctl_table_set *)) 1983 { 1984 INIT_LIST_HEAD(&p->list); 1985 p->parent = parent ? parent : &sysctl_table_root.default_set; 1986 p->is_seen = is_seen; 1987 } 1988 1989 #else /* !CONFIG_SYSCTL */ 1990 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1991 { 1992 return NULL; 1993 } 1994 1995 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1996 struct ctl_table *table) 1997 { 1998 return NULL; 1999 } 2000 2001 void unregister_sysctl_table(struct ctl_table_header * table) 2002 { 2003 } 2004 2005 void setup_sysctl_set(struct ctl_table_set *p, 2006 struct ctl_table_set *parent, 2007 int (*is_seen)(struct ctl_table_set *)) 2008 { 2009 } 2010 2011 void sysctl_head_put(struct ctl_table_header *head) 2012 { 2013 } 2014 2015 #endif /* CONFIG_SYSCTL */ 2016 2017 /* 2018 * /proc/sys support 2019 */ 2020 2021 #ifdef CONFIG_PROC_SYSCTL 2022 2023 static int _proc_do_string(void* data, int maxlen, int write, 2024 void __user *buffer, 2025 size_t *lenp, loff_t *ppos) 2026 { 2027 size_t len; 2028 char __user *p; 2029 char c; 2030 2031 if (!data || !maxlen || !*lenp) { 2032 *lenp = 0; 2033 return 0; 2034 } 2035 2036 if (write) { 2037 len = 0; 2038 p = buffer; 2039 while (len < *lenp) { 2040 if (get_user(c, p++)) 2041 return -EFAULT; 2042 if (c == 0 || c == '\n') 2043 break; 2044 len++; 2045 } 2046 if (len >= maxlen) 2047 len = maxlen-1; 2048 if(copy_from_user(data, buffer, len)) 2049 return -EFAULT; 2050 ((char *) data)[len] = 0; 2051 *ppos += *lenp; 2052 } else { 2053 len = strlen(data); 2054 if (len > maxlen) 2055 len = maxlen; 2056 2057 if (*ppos > len) { 2058 *lenp = 0; 2059 return 0; 2060 } 2061 2062 data += *ppos; 2063 len -= *ppos; 2064 2065 if (len > *lenp) 2066 len = *lenp; 2067 if (len) 2068 if(copy_to_user(buffer, data, len)) 2069 return -EFAULT; 2070 if (len < *lenp) { 2071 if(put_user('\n', ((char __user *) buffer) + len)) 2072 return -EFAULT; 2073 len++; 2074 } 2075 *lenp = len; 2076 *ppos += len; 2077 } 2078 return 0; 2079 } 2080 2081 /** 2082 * proc_dostring - read a string sysctl 2083 * @table: the sysctl table 2084 * @write: %TRUE if this is a write to the sysctl file 2085 * @buffer: the user buffer 2086 * @lenp: the size of the user buffer 2087 * @ppos: file position 2088 * 2089 * Reads/writes a string from/to the user buffer. If the kernel 2090 * buffer provided is not large enough to hold the string, the 2091 * string is truncated. The copied string is %NULL-terminated. 2092 * If the string is being read by the user process, it is copied 2093 * and a newline '\n' is added. It is truncated if the buffer is 2094 * not large enough. 2095 * 2096 * Returns 0 on success. 2097 */ 2098 int proc_dostring(struct ctl_table *table, int write, 2099 void __user *buffer, size_t *lenp, loff_t *ppos) 2100 { 2101 return _proc_do_string(table->data, table->maxlen, write, 2102 buffer, lenp, ppos); 2103 } 2104 2105 static size_t proc_skip_spaces(char **buf) 2106 { 2107 size_t ret; 2108 char *tmp = skip_spaces(*buf); 2109 ret = tmp - *buf; 2110 *buf = tmp; 2111 return ret; 2112 } 2113 2114 static void proc_skip_char(char **buf, size_t *size, const char v) 2115 { 2116 while (*size) { 2117 if (**buf != v) 2118 break; 2119 (*size)--; 2120 (*buf)++; 2121 } 2122 } 2123 2124 #define TMPBUFLEN 22 2125 /** 2126 * proc_get_long - reads an ASCII formatted integer from a user buffer 2127 * 2128 * @buf: a kernel buffer 2129 * @size: size of the kernel buffer 2130 * @val: this is where the number will be stored 2131 * @neg: set to %TRUE if number is negative 2132 * @perm_tr: a vector which contains the allowed trailers 2133 * @perm_tr_len: size of the perm_tr vector 2134 * @tr: pointer to store the trailer character 2135 * 2136 * In case of success %0 is returned and @buf and @size are updated with 2137 * the amount of bytes read. If @tr is non-NULL and a trailing 2138 * character exists (size is non-zero after returning from this 2139 * function), @tr is updated with the trailing character. 2140 */ 2141 static int proc_get_long(char **buf, size_t *size, 2142 unsigned long *val, bool *neg, 2143 const char *perm_tr, unsigned perm_tr_len, char *tr) 2144 { 2145 int len; 2146 char *p, tmp[TMPBUFLEN]; 2147 2148 if (!*size) 2149 return -EINVAL; 2150 2151 len = *size; 2152 if (len > TMPBUFLEN - 1) 2153 len = TMPBUFLEN - 1; 2154 2155 memcpy(tmp, *buf, len); 2156 2157 tmp[len] = 0; 2158 p = tmp; 2159 if (*p == '-' && *size > 1) { 2160 *neg = true; 2161 p++; 2162 } else 2163 *neg = false; 2164 if (!isdigit(*p)) 2165 return -EINVAL; 2166 2167 *val = simple_strtoul(p, &p, 0); 2168 2169 len = p - tmp; 2170 2171 /* We don't know if the next char is whitespace thus we may accept 2172 * invalid integers (e.g. 1234...a) or two integers instead of one 2173 * (e.g. 123...1). So lets not allow such large numbers. */ 2174 if (len == TMPBUFLEN - 1) 2175 return -EINVAL; 2176 2177 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2178 return -EINVAL; 2179 2180 if (tr && (len < *size)) 2181 *tr = *p; 2182 2183 *buf += len; 2184 *size -= len; 2185 2186 return 0; 2187 } 2188 2189 /** 2190 * proc_put_long - converts an integer to a decimal ASCII formatted string 2191 * 2192 * @buf: the user buffer 2193 * @size: the size of the user buffer 2194 * @val: the integer to be converted 2195 * @neg: sign of the number, %TRUE for negative 2196 * 2197 * In case of success %0 is returned and @buf and @size are updated with 2198 * the amount of bytes written. 2199 */ 2200 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2201 bool neg) 2202 { 2203 int len; 2204 char tmp[TMPBUFLEN], *p = tmp; 2205 2206 sprintf(p, "%s%lu", neg ? "-" : "", val); 2207 len = strlen(tmp); 2208 if (len > *size) 2209 len = *size; 2210 if (copy_to_user(*buf, tmp, len)) 2211 return -EFAULT; 2212 *size -= len; 2213 *buf += len; 2214 return 0; 2215 } 2216 #undef TMPBUFLEN 2217 2218 static int proc_put_char(void __user **buf, size_t *size, char c) 2219 { 2220 if (*size) { 2221 char __user **buffer = (char __user **)buf; 2222 if (put_user(c, *buffer)) 2223 return -EFAULT; 2224 (*size)--, (*buffer)++; 2225 *buf = *buffer; 2226 } 2227 return 0; 2228 } 2229 2230 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2231 int *valp, 2232 int write, void *data) 2233 { 2234 if (write) { 2235 *valp = *negp ? -*lvalp : *lvalp; 2236 } else { 2237 int val = *valp; 2238 if (val < 0) { 2239 *negp = true; 2240 *lvalp = (unsigned long)-val; 2241 } else { 2242 *negp = false; 2243 *lvalp = (unsigned long)val; 2244 } 2245 } 2246 return 0; 2247 } 2248 2249 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2250 2251 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2252 int write, void __user *buffer, 2253 size_t *lenp, loff_t *ppos, 2254 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2255 int write, void *data), 2256 void *data) 2257 { 2258 int *i, vleft, first = 1, err = 0; 2259 unsigned long page = 0; 2260 size_t left; 2261 char *kbuf; 2262 2263 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2264 *lenp = 0; 2265 return 0; 2266 } 2267 2268 i = (int *) tbl_data; 2269 vleft = table->maxlen / sizeof(*i); 2270 left = *lenp; 2271 2272 if (!conv) 2273 conv = do_proc_dointvec_conv; 2274 2275 if (write) { 2276 if (left > PAGE_SIZE - 1) 2277 left = PAGE_SIZE - 1; 2278 page = __get_free_page(GFP_TEMPORARY); 2279 kbuf = (char *) page; 2280 if (!kbuf) 2281 return -ENOMEM; 2282 if (copy_from_user(kbuf, buffer, left)) { 2283 err = -EFAULT; 2284 goto free; 2285 } 2286 kbuf[left] = 0; 2287 } 2288 2289 for (; left && vleft--; i++, first=0) { 2290 unsigned long lval; 2291 bool neg; 2292 2293 if (write) { 2294 left -= proc_skip_spaces(&kbuf); 2295 2296 if (!left) 2297 break; 2298 err = proc_get_long(&kbuf, &left, &lval, &neg, 2299 proc_wspace_sep, 2300 sizeof(proc_wspace_sep), NULL); 2301 if (err) 2302 break; 2303 if (conv(&neg, &lval, i, 1, data)) { 2304 err = -EINVAL; 2305 break; 2306 } 2307 } else { 2308 if (conv(&neg, &lval, i, 0, data)) { 2309 err = -EINVAL; 2310 break; 2311 } 2312 if (!first) 2313 err = proc_put_char(&buffer, &left, '\t'); 2314 if (err) 2315 break; 2316 err = proc_put_long(&buffer, &left, lval, neg); 2317 if (err) 2318 break; 2319 } 2320 } 2321 2322 if (!write && !first && left && !err) 2323 err = proc_put_char(&buffer, &left, '\n'); 2324 if (write && !err && left) 2325 left -= proc_skip_spaces(&kbuf); 2326 free: 2327 if (write) { 2328 free_page(page); 2329 if (first) 2330 return err ? : -EINVAL; 2331 } 2332 *lenp -= left; 2333 *ppos += *lenp; 2334 return err; 2335 } 2336 2337 static int do_proc_dointvec(struct ctl_table *table, int write, 2338 void __user *buffer, size_t *lenp, loff_t *ppos, 2339 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2340 int write, void *data), 2341 void *data) 2342 { 2343 return __do_proc_dointvec(table->data, table, write, 2344 buffer, lenp, ppos, conv, data); 2345 } 2346 2347 /** 2348 * proc_dointvec - read a vector of integers 2349 * @table: the sysctl table 2350 * @write: %TRUE if this is a write to the sysctl file 2351 * @buffer: the user buffer 2352 * @lenp: the size of the user buffer 2353 * @ppos: file position 2354 * 2355 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2356 * values from/to the user buffer, treated as an ASCII string. 2357 * 2358 * Returns 0 on success. 2359 */ 2360 int proc_dointvec(struct ctl_table *table, int write, 2361 void __user *buffer, size_t *lenp, loff_t *ppos) 2362 { 2363 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2364 NULL,NULL); 2365 } 2366 2367 /* 2368 * Taint values can only be increased 2369 * This means we can safely use a temporary. 2370 */ 2371 static int proc_taint(struct ctl_table *table, int write, 2372 void __user *buffer, size_t *lenp, loff_t *ppos) 2373 { 2374 struct ctl_table t; 2375 unsigned long tmptaint = get_taint(); 2376 int err; 2377 2378 if (write && !capable(CAP_SYS_ADMIN)) 2379 return -EPERM; 2380 2381 t = *table; 2382 t.data = &tmptaint; 2383 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2384 if (err < 0) 2385 return err; 2386 2387 if (write) { 2388 /* 2389 * Poor man's atomic or. Not worth adding a primitive 2390 * to everyone's atomic.h for this 2391 */ 2392 int i; 2393 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2394 if ((tmptaint >> i) & 1) 2395 add_taint(i); 2396 } 2397 } 2398 2399 return err; 2400 } 2401 2402 struct do_proc_dointvec_minmax_conv_param { 2403 int *min; 2404 int *max; 2405 }; 2406 2407 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2408 int *valp, 2409 int write, void *data) 2410 { 2411 struct do_proc_dointvec_minmax_conv_param *param = data; 2412 if (write) { 2413 int val = *negp ? -*lvalp : *lvalp; 2414 if ((param->min && *param->min > val) || 2415 (param->max && *param->max < val)) 2416 return -EINVAL; 2417 *valp = val; 2418 } else { 2419 int val = *valp; 2420 if (val < 0) { 2421 *negp = true; 2422 *lvalp = (unsigned long)-val; 2423 } else { 2424 *negp = false; 2425 *lvalp = (unsigned long)val; 2426 } 2427 } 2428 return 0; 2429 } 2430 2431 /** 2432 * proc_dointvec_minmax - read a vector of integers with min/max values 2433 * @table: the sysctl table 2434 * @write: %TRUE if this is a write to the sysctl file 2435 * @buffer: the user buffer 2436 * @lenp: the size of the user buffer 2437 * @ppos: file position 2438 * 2439 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2440 * values from/to the user buffer, treated as an ASCII string. 2441 * 2442 * This routine will ensure the values are within the range specified by 2443 * table->extra1 (min) and table->extra2 (max). 2444 * 2445 * Returns 0 on success. 2446 */ 2447 int proc_dointvec_minmax(struct ctl_table *table, int write, 2448 void __user *buffer, size_t *lenp, loff_t *ppos) 2449 { 2450 struct do_proc_dointvec_minmax_conv_param param = { 2451 .min = (int *) table->extra1, 2452 .max = (int *) table->extra2, 2453 }; 2454 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2455 do_proc_dointvec_minmax_conv, ¶m); 2456 } 2457 2458 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2459 void __user *buffer, 2460 size_t *lenp, loff_t *ppos, 2461 unsigned long convmul, 2462 unsigned long convdiv) 2463 { 2464 unsigned long *i, *min, *max; 2465 int vleft, first = 1, err = 0; 2466 unsigned long page = 0; 2467 size_t left; 2468 char *kbuf; 2469 2470 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2471 *lenp = 0; 2472 return 0; 2473 } 2474 2475 i = (unsigned long *) data; 2476 min = (unsigned long *) table->extra1; 2477 max = (unsigned long *) table->extra2; 2478 vleft = table->maxlen / sizeof(unsigned long); 2479 left = *lenp; 2480 2481 if (write) { 2482 if (left > PAGE_SIZE - 1) 2483 left = PAGE_SIZE - 1; 2484 page = __get_free_page(GFP_TEMPORARY); 2485 kbuf = (char *) page; 2486 if (!kbuf) 2487 return -ENOMEM; 2488 if (copy_from_user(kbuf, buffer, left)) { 2489 err = -EFAULT; 2490 goto free; 2491 } 2492 kbuf[left] = 0; 2493 } 2494 2495 for (; left && vleft--; i++, first = 0) { 2496 unsigned long val; 2497 2498 if (write) { 2499 bool neg; 2500 2501 left -= proc_skip_spaces(&kbuf); 2502 2503 err = proc_get_long(&kbuf, &left, &val, &neg, 2504 proc_wspace_sep, 2505 sizeof(proc_wspace_sep), NULL); 2506 if (err) 2507 break; 2508 if (neg) 2509 continue; 2510 if ((min && val < *min) || (max && val > *max)) 2511 continue; 2512 *i = val; 2513 } else { 2514 val = convdiv * (*i) / convmul; 2515 if (!first) 2516 err = proc_put_char(&buffer, &left, '\t'); 2517 err = proc_put_long(&buffer, &left, val, false); 2518 if (err) 2519 break; 2520 } 2521 } 2522 2523 if (!write && !first && left && !err) 2524 err = proc_put_char(&buffer, &left, '\n'); 2525 if (write && !err) 2526 left -= proc_skip_spaces(&kbuf); 2527 free: 2528 if (write) { 2529 free_page(page); 2530 if (first) 2531 return err ? : -EINVAL; 2532 } 2533 *lenp -= left; 2534 *ppos += *lenp; 2535 return err; 2536 } 2537 2538 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2539 void __user *buffer, 2540 size_t *lenp, loff_t *ppos, 2541 unsigned long convmul, 2542 unsigned long convdiv) 2543 { 2544 return __do_proc_doulongvec_minmax(table->data, table, write, 2545 buffer, lenp, ppos, convmul, convdiv); 2546 } 2547 2548 /** 2549 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2550 * @table: the sysctl table 2551 * @write: %TRUE if this is a write to the sysctl file 2552 * @buffer: the user buffer 2553 * @lenp: the size of the user buffer 2554 * @ppos: file position 2555 * 2556 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2557 * values from/to the user buffer, treated as an ASCII string. 2558 * 2559 * This routine will ensure the values are within the range specified by 2560 * table->extra1 (min) and table->extra2 (max). 2561 * 2562 * Returns 0 on success. 2563 */ 2564 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2565 void __user *buffer, size_t *lenp, loff_t *ppos) 2566 { 2567 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2568 } 2569 2570 /** 2571 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2572 * @table: the sysctl table 2573 * @write: %TRUE if this is a write to the sysctl file 2574 * @buffer: the user buffer 2575 * @lenp: the size of the user buffer 2576 * @ppos: file position 2577 * 2578 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2579 * values from/to the user buffer, treated as an ASCII string. The values 2580 * are treated as milliseconds, and converted to jiffies when they are stored. 2581 * 2582 * This routine will ensure the values are within the range specified by 2583 * table->extra1 (min) and table->extra2 (max). 2584 * 2585 * Returns 0 on success. 2586 */ 2587 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2588 void __user *buffer, 2589 size_t *lenp, loff_t *ppos) 2590 { 2591 return do_proc_doulongvec_minmax(table, write, buffer, 2592 lenp, ppos, HZ, 1000l); 2593 } 2594 2595 2596 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2597 int *valp, 2598 int write, void *data) 2599 { 2600 if (write) { 2601 if (*lvalp > LONG_MAX / HZ) 2602 return 1; 2603 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2604 } else { 2605 int val = *valp; 2606 unsigned long lval; 2607 if (val < 0) { 2608 *negp = true; 2609 lval = (unsigned long)-val; 2610 } else { 2611 *negp = false; 2612 lval = (unsigned long)val; 2613 } 2614 *lvalp = lval / HZ; 2615 } 2616 return 0; 2617 } 2618 2619 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2620 int *valp, 2621 int write, void *data) 2622 { 2623 if (write) { 2624 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2625 return 1; 2626 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2627 } else { 2628 int val = *valp; 2629 unsigned long lval; 2630 if (val < 0) { 2631 *negp = true; 2632 lval = (unsigned long)-val; 2633 } else { 2634 *negp = false; 2635 lval = (unsigned long)val; 2636 } 2637 *lvalp = jiffies_to_clock_t(lval); 2638 } 2639 return 0; 2640 } 2641 2642 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2643 int *valp, 2644 int write, void *data) 2645 { 2646 if (write) { 2647 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2648 } else { 2649 int val = *valp; 2650 unsigned long lval; 2651 if (val < 0) { 2652 *negp = true; 2653 lval = (unsigned long)-val; 2654 } else { 2655 *negp = false; 2656 lval = (unsigned long)val; 2657 } 2658 *lvalp = jiffies_to_msecs(lval); 2659 } 2660 return 0; 2661 } 2662 2663 /** 2664 * proc_dointvec_jiffies - read a vector of integers as seconds 2665 * @table: the sysctl table 2666 * @write: %TRUE if this is a write to the sysctl file 2667 * @buffer: the user buffer 2668 * @lenp: the size of the user buffer 2669 * @ppos: file position 2670 * 2671 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2672 * values from/to the user buffer, treated as an ASCII string. 2673 * The values read are assumed to be in seconds, and are converted into 2674 * jiffies. 2675 * 2676 * Returns 0 on success. 2677 */ 2678 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2679 void __user *buffer, size_t *lenp, loff_t *ppos) 2680 { 2681 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2682 do_proc_dointvec_jiffies_conv,NULL); 2683 } 2684 2685 /** 2686 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2687 * @table: the sysctl table 2688 * @write: %TRUE if this is a write to the sysctl file 2689 * @buffer: the user buffer 2690 * @lenp: the size of the user buffer 2691 * @ppos: pointer to the file position 2692 * 2693 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2694 * values from/to the user buffer, treated as an ASCII string. 2695 * The values read are assumed to be in 1/USER_HZ seconds, and 2696 * are converted into jiffies. 2697 * 2698 * Returns 0 on success. 2699 */ 2700 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2701 void __user *buffer, size_t *lenp, loff_t *ppos) 2702 { 2703 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2704 do_proc_dointvec_userhz_jiffies_conv,NULL); 2705 } 2706 2707 /** 2708 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2709 * @table: the sysctl table 2710 * @write: %TRUE if this is a write to the sysctl file 2711 * @buffer: the user buffer 2712 * @lenp: the size of the user buffer 2713 * @ppos: file position 2714 * @ppos: the current position in the file 2715 * 2716 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2717 * values from/to the user buffer, treated as an ASCII string. 2718 * The values read are assumed to be in 1/1000 seconds, and 2719 * are converted into jiffies. 2720 * 2721 * Returns 0 on success. 2722 */ 2723 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2724 void __user *buffer, size_t *lenp, loff_t *ppos) 2725 { 2726 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2727 do_proc_dointvec_ms_jiffies_conv, NULL); 2728 } 2729 2730 static int proc_do_cad_pid(struct ctl_table *table, int write, 2731 void __user *buffer, size_t *lenp, loff_t *ppos) 2732 { 2733 struct pid *new_pid; 2734 pid_t tmp; 2735 int r; 2736 2737 tmp = pid_vnr(cad_pid); 2738 2739 r = __do_proc_dointvec(&tmp, table, write, buffer, 2740 lenp, ppos, NULL, NULL); 2741 if (r || !write) 2742 return r; 2743 2744 new_pid = find_get_pid(tmp); 2745 if (!new_pid) 2746 return -ESRCH; 2747 2748 put_pid(xchg(&cad_pid, new_pid)); 2749 return 0; 2750 } 2751 2752 /** 2753 * proc_do_large_bitmap - read/write from/to a large bitmap 2754 * @table: the sysctl table 2755 * @write: %TRUE if this is a write to the sysctl file 2756 * @buffer: the user buffer 2757 * @lenp: the size of the user buffer 2758 * @ppos: file position 2759 * 2760 * The bitmap is stored at table->data and the bitmap length (in bits) 2761 * in table->maxlen. 2762 * 2763 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2764 * large bitmaps may be represented in a compact manner. Writing into 2765 * the file will clear the bitmap then update it with the given input. 2766 * 2767 * Returns 0 on success. 2768 */ 2769 int proc_do_large_bitmap(struct ctl_table *table, int write, 2770 void __user *buffer, size_t *lenp, loff_t *ppos) 2771 { 2772 int err = 0; 2773 bool first = 1; 2774 size_t left = *lenp; 2775 unsigned long bitmap_len = table->maxlen; 2776 unsigned long *bitmap = (unsigned long *) table->data; 2777 unsigned long *tmp_bitmap = NULL; 2778 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2779 2780 if (!bitmap_len || !left || (*ppos && !write)) { 2781 *lenp = 0; 2782 return 0; 2783 } 2784 2785 if (write) { 2786 unsigned long page = 0; 2787 char *kbuf; 2788 2789 if (left > PAGE_SIZE - 1) 2790 left = PAGE_SIZE - 1; 2791 2792 page = __get_free_page(GFP_TEMPORARY); 2793 kbuf = (char *) page; 2794 if (!kbuf) 2795 return -ENOMEM; 2796 if (copy_from_user(kbuf, buffer, left)) { 2797 free_page(page); 2798 return -EFAULT; 2799 } 2800 kbuf[left] = 0; 2801 2802 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2803 GFP_KERNEL); 2804 if (!tmp_bitmap) { 2805 free_page(page); 2806 return -ENOMEM; 2807 } 2808 proc_skip_char(&kbuf, &left, '\n'); 2809 while (!err && left) { 2810 unsigned long val_a, val_b; 2811 bool neg; 2812 2813 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2814 sizeof(tr_a), &c); 2815 if (err) 2816 break; 2817 if (val_a >= bitmap_len || neg) { 2818 err = -EINVAL; 2819 break; 2820 } 2821 2822 val_b = val_a; 2823 if (left) { 2824 kbuf++; 2825 left--; 2826 } 2827 2828 if (c == '-') { 2829 err = proc_get_long(&kbuf, &left, &val_b, 2830 &neg, tr_b, sizeof(tr_b), 2831 &c); 2832 if (err) 2833 break; 2834 if (val_b >= bitmap_len || neg || 2835 val_a > val_b) { 2836 err = -EINVAL; 2837 break; 2838 } 2839 if (left) { 2840 kbuf++; 2841 left--; 2842 } 2843 } 2844 2845 while (val_a <= val_b) 2846 set_bit(val_a++, tmp_bitmap); 2847 2848 first = 0; 2849 proc_skip_char(&kbuf, &left, '\n'); 2850 } 2851 free_page(page); 2852 } else { 2853 unsigned long bit_a, bit_b = 0; 2854 2855 while (left) { 2856 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2857 if (bit_a >= bitmap_len) 2858 break; 2859 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2860 bit_a + 1) - 1; 2861 2862 if (!first) { 2863 err = proc_put_char(&buffer, &left, ','); 2864 if (err) 2865 break; 2866 } 2867 err = proc_put_long(&buffer, &left, bit_a, false); 2868 if (err) 2869 break; 2870 if (bit_a != bit_b) { 2871 err = proc_put_char(&buffer, &left, '-'); 2872 if (err) 2873 break; 2874 err = proc_put_long(&buffer, &left, bit_b, false); 2875 if (err) 2876 break; 2877 } 2878 2879 first = 0; bit_b++; 2880 } 2881 if (!err) 2882 err = proc_put_char(&buffer, &left, '\n'); 2883 } 2884 2885 if (!err) { 2886 if (write) { 2887 if (*ppos) 2888 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2889 else 2890 memcpy(bitmap, tmp_bitmap, 2891 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2892 } 2893 kfree(tmp_bitmap); 2894 *lenp -= left; 2895 *ppos += *lenp; 2896 return 0; 2897 } else { 2898 kfree(tmp_bitmap); 2899 return err; 2900 } 2901 } 2902 2903 #else /* CONFIG_PROC_FS */ 2904 2905 int proc_dostring(struct ctl_table *table, int write, 2906 void __user *buffer, size_t *lenp, loff_t *ppos) 2907 { 2908 return -ENOSYS; 2909 } 2910 2911 int proc_dointvec(struct ctl_table *table, int write, 2912 void __user *buffer, size_t *lenp, loff_t *ppos) 2913 { 2914 return -ENOSYS; 2915 } 2916 2917 int proc_dointvec_minmax(struct ctl_table *table, int write, 2918 void __user *buffer, size_t *lenp, loff_t *ppos) 2919 { 2920 return -ENOSYS; 2921 } 2922 2923 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2924 void __user *buffer, size_t *lenp, loff_t *ppos) 2925 { 2926 return -ENOSYS; 2927 } 2928 2929 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2930 void __user *buffer, size_t *lenp, loff_t *ppos) 2931 { 2932 return -ENOSYS; 2933 } 2934 2935 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2936 void __user *buffer, size_t *lenp, loff_t *ppos) 2937 { 2938 return -ENOSYS; 2939 } 2940 2941 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2942 void __user *buffer, size_t *lenp, loff_t *ppos) 2943 { 2944 return -ENOSYS; 2945 } 2946 2947 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2948 void __user *buffer, 2949 size_t *lenp, loff_t *ppos) 2950 { 2951 return -ENOSYS; 2952 } 2953 2954 2955 #endif /* CONFIG_PROC_FS */ 2956 2957 /* 2958 * No sense putting this after each symbol definition, twice, 2959 * exception granted :-) 2960 */ 2961 EXPORT_SYMBOL(proc_dointvec); 2962 EXPORT_SYMBOL(proc_dointvec_jiffies); 2963 EXPORT_SYMBOL(proc_dointvec_minmax); 2964 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2965 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2966 EXPORT_SYMBOL(proc_dostring); 2967 EXPORT_SYMBOL(proc_doulongvec_minmax); 2968 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2969 EXPORT_SYMBOL(register_sysctl_table); 2970 EXPORT_SYMBOL(register_sysctl_paths); 2971 EXPORT_SYMBOL(unregister_sysctl_table); 2972