1 /* 2 * sysctl.c: General linux system control interface 3 * 4 * Begun 24 March 1995, Stephen Tweedie 5 * Added /proc support, Dec 1995 6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. 7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. 8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. 9 * Dynamic registration fixes, Stephen Tweedie. 10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. 11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris 12 * Horn. 13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. 14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. 15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill 16 * Wendling. 17 * The list_for_each() macro wasn't appropriate for the sysctl loop. 18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling 19 */ 20 21 #include <linux/module.h> 22 #include <linux/mm.h> 23 #include <linux/swap.h> 24 #include <linux/slab.h> 25 #include <linux/sysctl.h> 26 #include <linux/signal.h> 27 #include <linux/printk.h> 28 #include <linux/proc_fs.h> 29 #include <linux/security.h> 30 #include <linux/ctype.h> 31 #include <linux/kmemcheck.h> 32 #include <linux/fs.h> 33 #include <linux/init.h> 34 #include <linux/kernel.h> 35 #include <linux/kobject.h> 36 #include <linux/net.h> 37 #include <linux/sysrq.h> 38 #include <linux/highuid.h> 39 #include <linux/writeback.h> 40 #include <linux/ratelimit.h> 41 #include <linux/compaction.h> 42 #include <linux/hugetlb.h> 43 #include <linux/initrd.h> 44 #include <linux/key.h> 45 #include <linux/times.h> 46 #include <linux/limits.h> 47 #include <linux/dcache.h> 48 #include <linux/dnotify.h> 49 #include <linux/syscalls.h> 50 #include <linux/vmstat.h> 51 #include <linux/nfs_fs.h> 52 #include <linux/acpi.h> 53 #include <linux/reboot.h> 54 #include <linux/ftrace.h> 55 #include <linux/perf_event.h> 56 #include <linux/kprobes.h> 57 #include <linux/pipe_fs_i.h> 58 #include <linux/oom.h> 59 60 #include <asm/uaccess.h> 61 #include <asm/processor.h> 62 63 #ifdef CONFIG_X86 64 #include <asm/nmi.h> 65 #include <asm/stacktrace.h> 66 #include <asm/io.h> 67 #endif 68 #ifdef CONFIG_BSD_PROCESS_ACCT 69 #include <linux/acct.h> 70 #endif 71 #ifdef CONFIG_RT_MUTEXES 72 #include <linux/rtmutex.h> 73 #endif 74 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 75 #include <linux/lockdep.h> 76 #endif 77 #ifdef CONFIG_CHR_DEV_SG 78 #include <scsi/sg.h> 79 #endif 80 81 #ifdef CONFIG_LOCKUP_DETECTOR 82 #include <linux/nmi.h> 83 #endif 84 85 86 #if defined(CONFIG_SYSCTL) 87 88 /* External variables not in a header file. */ 89 extern int sysctl_overcommit_memory; 90 extern int sysctl_overcommit_ratio; 91 extern int max_threads; 92 extern int core_uses_pid; 93 extern int suid_dumpable; 94 extern char core_pattern[]; 95 extern unsigned int core_pipe_limit; 96 extern int pid_max; 97 extern int min_free_kbytes; 98 extern int pid_max_min, pid_max_max; 99 extern int sysctl_drop_caches; 100 extern int percpu_pagelist_fraction; 101 extern int compat_log; 102 extern int latencytop_enabled; 103 extern int sysctl_nr_open_min, sysctl_nr_open_max; 104 #ifndef CONFIG_MMU 105 extern int sysctl_nr_trim_pages; 106 #endif 107 #ifdef CONFIG_BLOCK 108 extern int blk_iopoll_enabled; 109 #endif 110 111 /* Constants used for minimum and maximum */ 112 #ifdef CONFIG_LOCKUP_DETECTOR 113 static int sixty = 60; 114 static int neg_one = -1; 115 #endif 116 117 static int zero; 118 static int __maybe_unused one = 1; 119 static int __maybe_unused two = 2; 120 static unsigned long one_ul = 1; 121 static int one_hundred = 100; 122 #ifdef CONFIG_PRINTK 123 static int ten_thousand = 10000; 124 #endif 125 126 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 127 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 128 129 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 130 static int maxolduid = 65535; 131 static int minolduid; 132 static int min_percpu_pagelist_fract = 8; 133 134 static int ngroups_max = NGROUPS_MAX; 135 136 #ifdef CONFIG_INOTIFY_USER 137 #include <linux/inotify.h> 138 #endif 139 #ifdef CONFIG_SPARC 140 #include <asm/system.h> 141 #endif 142 143 #ifdef CONFIG_SPARC64 144 extern int sysctl_tsb_ratio; 145 #endif 146 147 #ifdef __hppa__ 148 extern int pwrsw_enabled; 149 extern int unaligned_enabled; 150 #endif 151 152 #ifdef CONFIG_S390 153 #ifdef CONFIG_MATHEMU 154 extern int sysctl_ieee_emulation_warnings; 155 #endif 156 extern int sysctl_userprocess_debug; 157 extern int spin_retry; 158 #endif 159 160 #ifdef CONFIG_IA64 161 extern int no_unaligned_warning; 162 extern int unaligned_dump_stack; 163 #endif 164 165 #ifdef CONFIG_PROC_SYSCTL 166 static int proc_do_cad_pid(struct ctl_table *table, int write, 167 void __user *buffer, size_t *lenp, loff_t *ppos); 168 static int proc_taint(struct ctl_table *table, int write, 169 void __user *buffer, size_t *lenp, loff_t *ppos); 170 #endif 171 172 #ifdef CONFIG_MAGIC_SYSRQ 173 /* Note: sysrq code uses it's own private copy */ 174 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 175 176 static int sysrq_sysctl_handler(ctl_table *table, int write, 177 void __user *buffer, size_t *lenp, 178 loff_t *ppos) 179 { 180 int error; 181 182 error = proc_dointvec(table, write, buffer, lenp, ppos); 183 if (error) 184 return error; 185 186 if (write) 187 sysrq_toggle_support(__sysrq_enabled); 188 189 return 0; 190 } 191 192 #endif 193 194 static struct ctl_table root_table[]; 195 static struct ctl_table_root sysctl_table_root; 196 static struct ctl_table_header root_table_header = { 197 {{.count = 1, 198 .ctl_table = root_table, 199 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, 200 .root = &sysctl_table_root, 201 .set = &sysctl_table_root.default_set, 202 }; 203 static struct ctl_table_root sysctl_table_root = { 204 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 205 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 206 }; 207 208 static struct ctl_table kern_table[]; 209 static struct ctl_table vm_table[]; 210 static struct ctl_table fs_table[]; 211 static struct ctl_table debug_table[]; 212 static struct ctl_table dev_table[]; 213 extern struct ctl_table random_table[]; 214 #ifdef CONFIG_EPOLL 215 extern struct ctl_table epoll_table[]; 216 #endif 217 218 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 219 int sysctl_legacy_va_layout; 220 #endif 221 222 /* The default sysctl tables: */ 223 224 static struct ctl_table root_table[] = { 225 { 226 .procname = "kernel", 227 .mode = 0555, 228 .child = kern_table, 229 }, 230 { 231 .procname = "vm", 232 .mode = 0555, 233 .child = vm_table, 234 }, 235 { 236 .procname = "fs", 237 .mode = 0555, 238 .child = fs_table, 239 }, 240 { 241 .procname = "debug", 242 .mode = 0555, 243 .child = debug_table, 244 }, 245 { 246 .procname = "dev", 247 .mode = 0555, 248 .child = dev_table, 249 }, 250 { } 251 }; 252 253 #ifdef CONFIG_SCHED_DEBUG 254 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 255 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 256 static int min_wakeup_granularity_ns; /* 0 usecs */ 257 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 258 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 259 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 260 #endif 261 262 #ifdef CONFIG_COMPACTION 263 static int min_extfrag_threshold; 264 static int max_extfrag_threshold = 1000; 265 #endif 266 267 static struct ctl_table kern_table[] = { 268 { 269 .procname = "sched_child_runs_first", 270 .data = &sysctl_sched_child_runs_first, 271 .maxlen = sizeof(unsigned int), 272 .mode = 0644, 273 .proc_handler = proc_dointvec, 274 }, 275 #ifdef CONFIG_SCHED_DEBUG 276 { 277 .procname = "sched_min_granularity_ns", 278 .data = &sysctl_sched_min_granularity, 279 .maxlen = sizeof(unsigned int), 280 .mode = 0644, 281 .proc_handler = sched_proc_update_handler, 282 .extra1 = &min_sched_granularity_ns, 283 .extra2 = &max_sched_granularity_ns, 284 }, 285 { 286 .procname = "sched_latency_ns", 287 .data = &sysctl_sched_latency, 288 .maxlen = sizeof(unsigned int), 289 .mode = 0644, 290 .proc_handler = sched_proc_update_handler, 291 .extra1 = &min_sched_granularity_ns, 292 .extra2 = &max_sched_granularity_ns, 293 }, 294 { 295 .procname = "sched_wakeup_granularity_ns", 296 .data = &sysctl_sched_wakeup_granularity, 297 .maxlen = sizeof(unsigned int), 298 .mode = 0644, 299 .proc_handler = sched_proc_update_handler, 300 .extra1 = &min_wakeup_granularity_ns, 301 .extra2 = &max_wakeup_granularity_ns, 302 }, 303 { 304 .procname = "sched_tunable_scaling", 305 .data = &sysctl_sched_tunable_scaling, 306 .maxlen = sizeof(enum sched_tunable_scaling), 307 .mode = 0644, 308 .proc_handler = sched_proc_update_handler, 309 .extra1 = &min_sched_tunable_scaling, 310 .extra2 = &max_sched_tunable_scaling, 311 }, 312 { 313 .procname = "sched_migration_cost", 314 .data = &sysctl_sched_migration_cost, 315 .maxlen = sizeof(unsigned int), 316 .mode = 0644, 317 .proc_handler = proc_dointvec, 318 }, 319 { 320 .procname = "sched_nr_migrate", 321 .data = &sysctl_sched_nr_migrate, 322 .maxlen = sizeof(unsigned int), 323 .mode = 0644, 324 .proc_handler = proc_dointvec, 325 }, 326 { 327 .procname = "sched_time_avg", 328 .data = &sysctl_sched_time_avg, 329 .maxlen = sizeof(unsigned int), 330 .mode = 0644, 331 .proc_handler = proc_dointvec, 332 }, 333 { 334 .procname = "sched_shares_window", 335 .data = &sysctl_sched_shares_window, 336 .maxlen = sizeof(unsigned int), 337 .mode = 0644, 338 .proc_handler = proc_dointvec, 339 }, 340 { 341 .procname = "timer_migration", 342 .data = &sysctl_timer_migration, 343 .maxlen = sizeof(unsigned int), 344 .mode = 0644, 345 .proc_handler = proc_dointvec_minmax, 346 .extra1 = &zero, 347 .extra2 = &one, 348 }, 349 #endif 350 { 351 .procname = "sched_rt_period_us", 352 .data = &sysctl_sched_rt_period, 353 .maxlen = sizeof(unsigned int), 354 .mode = 0644, 355 .proc_handler = sched_rt_handler, 356 }, 357 { 358 .procname = "sched_rt_runtime_us", 359 .data = &sysctl_sched_rt_runtime, 360 .maxlen = sizeof(int), 361 .mode = 0644, 362 .proc_handler = sched_rt_handler, 363 }, 364 { 365 .procname = "sched_compat_yield", 366 .data = &sysctl_sched_compat_yield, 367 .maxlen = sizeof(unsigned int), 368 .mode = 0644, 369 .proc_handler = proc_dointvec, 370 }, 371 #ifdef CONFIG_SCHED_AUTOGROUP 372 { 373 .procname = "sched_autogroup_enabled", 374 .data = &sysctl_sched_autogroup_enabled, 375 .maxlen = sizeof(unsigned int), 376 .mode = 0644, 377 .proc_handler = proc_dointvec, 378 .extra1 = &zero, 379 .extra2 = &one, 380 }, 381 #endif 382 #ifdef CONFIG_PROVE_LOCKING 383 { 384 .procname = "prove_locking", 385 .data = &prove_locking, 386 .maxlen = sizeof(int), 387 .mode = 0644, 388 .proc_handler = proc_dointvec, 389 }, 390 #endif 391 #ifdef CONFIG_LOCK_STAT 392 { 393 .procname = "lock_stat", 394 .data = &lock_stat, 395 .maxlen = sizeof(int), 396 .mode = 0644, 397 .proc_handler = proc_dointvec, 398 }, 399 #endif 400 { 401 .procname = "panic", 402 .data = &panic_timeout, 403 .maxlen = sizeof(int), 404 .mode = 0644, 405 .proc_handler = proc_dointvec, 406 }, 407 { 408 .procname = "core_uses_pid", 409 .data = &core_uses_pid, 410 .maxlen = sizeof(int), 411 .mode = 0644, 412 .proc_handler = proc_dointvec, 413 }, 414 { 415 .procname = "core_pattern", 416 .data = core_pattern, 417 .maxlen = CORENAME_MAX_SIZE, 418 .mode = 0644, 419 .proc_handler = proc_dostring, 420 }, 421 { 422 .procname = "core_pipe_limit", 423 .data = &core_pipe_limit, 424 .maxlen = sizeof(unsigned int), 425 .mode = 0644, 426 .proc_handler = proc_dointvec, 427 }, 428 #ifdef CONFIG_PROC_SYSCTL 429 { 430 .procname = "tainted", 431 .maxlen = sizeof(long), 432 .mode = 0644, 433 .proc_handler = proc_taint, 434 }, 435 #endif 436 #ifdef CONFIG_LATENCYTOP 437 { 438 .procname = "latencytop", 439 .data = &latencytop_enabled, 440 .maxlen = sizeof(int), 441 .mode = 0644, 442 .proc_handler = proc_dointvec, 443 }, 444 #endif 445 #ifdef CONFIG_BLK_DEV_INITRD 446 { 447 .procname = "real-root-dev", 448 .data = &real_root_dev, 449 .maxlen = sizeof(int), 450 .mode = 0644, 451 .proc_handler = proc_dointvec, 452 }, 453 #endif 454 { 455 .procname = "print-fatal-signals", 456 .data = &print_fatal_signals, 457 .maxlen = sizeof(int), 458 .mode = 0644, 459 .proc_handler = proc_dointvec, 460 }, 461 #ifdef CONFIG_SPARC 462 { 463 .procname = "reboot-cmd", 464 .data = reboot_command, 465 .maxlen = 256, 466 .mode = 0644, 467 .proc_handler = proc_dostring, 468 }, 469 { 470 .procname = "stop-a", 471 .data = &stop_a_enabled, 472 .maxlen = sizeof (int), 473 .mode = 0644, 474 .proc_handler = proc_dointvec, 475 }, 476 { 477 .procname = "scons-poweroff", 478 .data = &scons_pwroff, 479 .maxlen = sizeof (int), 480 .mode = 0644, 481 .proc_handler = proc_dointvec, 482 }, 483 #endif 484 #ifdef CONFIG_SPARC64 485 { 486 .procname = "tsb-ratio", 487 .data = &sysctl_tsb_ratio, 488 .maxlen = sizeof (int), 489 .mode = 0644, 490 .proc_handler = proc_dointvec, 491 }, 492 #endif 493 #ifdef __hppa__ 494 { 495 .procname = "soft-power", 496 .data = &pwrsw_enabled, 497 .maxlen = sizeof (int), 498 .mode = 0644, 499 .proc_handler = proc_dointvec, 500 }, 501 { 502 .procname = "unaligned-trap", 503 .data = &unaligned_enabled, 504 .maxlen = sizeof (int), 505 .mode = 0644, 506 .proc_handler = proc_dointvec, 507 }, 508 #endif 509 { 510 .procname = "ctrl-alt-del", 511 .data = &C_A_D, 512 .maxlen = sizeof(int), 513 .mode = 0644, 514 .proc_handler = proc_dointvec, 515 }, 516 #ifdef CONFIG_FUNCTION_TRACER 517 { 518 .procname = "ftrace_enabled", 519 .data = &ftrace_enabled, 520 .maxlen = sizeof(int), 521 .mode = 0644, 522 .proc_handler = ftrace_enable_sysctl, 523 }, 524 #endif 525 #ifdef CONFIG_STACK_TRACER 526 { 527 .procname = "stack_tracer_enabled", 528 .data = &stack_tracer_enabled, 529 .maxlen = sizeof(int), 530 .mode = 0644, 531 .proc_handler = stack_trace_sysctl, 532 }, 533 #endif 534 #ifdef CONFIG_TRACING 535 { 536 .procname = "ftrace_dump_on_oops", 537 .data = &ftrace_dump_on_oops, 538 .maxlen = sizeof(int), 539 .mode = 0644, 540 .proc_handler = proc_dointvec, 541 }, 542 #endif 543 #ifdef CONFIG_MODULES 544 { 545 .procname = "modprobe", 546 .data = &modprobe_path, 547 .maxlen = KMOD_PATH_LEN, 548 .mode = 0644, 549 .proc_handler = proc_dostring, 550 }, 551 { 552 .procname = "modules_disabled", 553 .data = &modules_disabled, 554 .maxlen = sizeof(int), 555 .mode = 0644, 556 /* only handle a transition from default "0" to "1" */ 557 .proc_handler = proc_dointvec_minmax, 558 .extra1 = &one, 559 .extra2 = &one, 560 }, 561 #endif 562 #ifdef CONFIG_HOTPLUG 563 { 564 .procname = "hotplug", 565 .data = &uevent_helper, 566 .maxlen = UEVENT_HELPER_PATH_LEN, 567 .mode = 0644, 568 .proc_handler = proc_dostring, 569 }, 570 #endif 571 #ifdef CONFIG_CHR_DEV_SG 572 { 573 .procname = "sg-big-buff", 574 .data = &sg_big_buff, 575 .maxlen = sizeof (int), 576 .mode = 0444, 577 .proc_handler = proc_dointvec, 578 }, 579 #endif 580 #ifdef CONFIG_BSD_PROCESS_ACCT 581 { 582 .procname = "acct", 583 .data = &acct_parm, 584 .maxlen = 3*sizeof(int), 585 .mode = 0644, 586 .proc_handler = proc_dointvec, 587 }, 588 #endif 589 #ifdef CONFIG_MAGIC_SYSRQ 590 { 591 .procname = "sysrq", 592 .data = &__sysrq_enabled, 593 .maxlen = sizeof (int), 594 .mode = 0644, 595 .proc_handler = sysrq_sysctl_handler, 596 }, 597 #endif 598 #ifdef CONFIG_PROC_SYSCTL 599 { 600 .procname = "cad_pid", 601 .data = NULL, 602 .maxlen = sizeof (int), 603 .mode = 0600, 604 .proc_handler = proc_do_cad_pid, 605 }, 606 #endif 607 { 608 .procname = "threads-max", 609 .data = &max_threads, 610 .maxlen = sizeof(int), 611 .mode = 0644, 612 .proc_handler = proc_dointvec, 613 }, 614 { 615 .procname = "random", 616 .mode = 0555, 617 .child = random_table, 618 }, 619 { 620 .procname = "overflowuid", 621 .data = &overflowuid, 622 .maxlen = sizeof(int), 623 .mode = 0644, 624 .proc_handler = proc_dointvec_minmax, 625 .extra1 = &minolduid, 626 .extra2 = &maxolduid, 627 }, 628 { 629 .procname = "overflowgid", 630 .data = &overflowgid, 631 .maxlen = sizeof(int), 632 .mode = 0644, 633 .proc_handler = proc_dointvec_minmax, 634 .extra1 = &minolduid, 635 .extra2 = &maxolduid, 636 }, 637 #ifdef CONFIG_S390 638 #ifdef CONFIG_MATHEMU 639 { 640 .procname = "ieee_emulation_warnings", 641 .data = &sysctl_ieee_emulation_warnings, 642 .maxlen = sizeof(int), 643 .mode = 0644, 644 .proc_handler = proc_dointvec, 645 }, 646 #endif 647 { 648 .procname = "userprocess_debug", 649 .data = &show_unhandled_signals, 650 .maxlen = sizeof(int), 651 .mode = 0644, 652 .proc_handler = proc_dointvec, 653 }, 654 #endif 655 { 656 .procname = "pid_max", 657 .data = &pid_max, 658 .maxlen = sizeof (int), 659 .mode = 0644, 660 .proc_handler = proc_dointvec_minmax, 661 .extra1 = &pid_max_min, 662 .extra2 = &pid_max_max, 663 }, 664 { 665 .procname = "panic_on_oops", 666 .data = &panic_on_oops, 667 .maxlen = sizeof(int), 668 .mode = 0644, 669 .proc_handler = proc_dointvec, 670 }, 671 #if defined CONFIG_PRINTK 672 { 673 .procname = "printk", 674 .data = &console_loglevel, 675 .maxlen = 4*sizeof(int), 676 .mode = 0644, 677 .proc_handler = proc_dointvec, 678 }, 679 { 680 .procname = "printk_ratelimit", 681 .data = &printk_ratelimit_state.interval, 682 .maxlen = sizeof(int), 683 .mode = 0644, 684 .proc_handler = proc_dointvec_jiffies, 685 }, 686 { 687 .procname = "printk_ratelimit_burst", 688 .data = &printk_ratelimit_state.burst, 689 .maxlen = sizeof(int), 690 .mode = 0644, 691 .proc_handler = proc_dointvec, 692 }, 693 { 694 .procname = "printk_delay", 695 .data = &printk_delay_msec, 696 .maxlen = sizeof(int), 697 .mode = 0644, 698 .proc_handler = proc_dointvec_minmax, 699 .extra1 = &zero, 700 .extra2 = &ten_thousand, 701 }, 702 { 703 .procname = "dmesg_restrict", 704 .data = &dmesg_restrict, 705 .maxlen = sizeof(int), 706 .mode = 0644, 707 .proc_handler = proc_dointvec_minmax, 708 .extra1 = &zero, 709 .extra2 = &one, 710 }, 711 { 712 .procname = "kptr_restrict", 713 .data = &kptr_restrict, 714 .maxlen = sizeof(int), 715 .mode = 0644, 716 .proc_handler = proc_dointvec_minmax, 717 .extra1 = &zero, 718 .extra2 = &two, 719 }, 720 #endif 721 { 722 .procname = "ngroups_max", 723 .data = &ngroups_max, 724 .maxlen = sizeof (int), 725 .mode = 0444, 726 .proc_handler = proc_dointvec, 727 }, 728 #if defined(CONFIG_LOCKUP_DETECTOR) 729 { 730 .procname = "watchdog", 731 .data = &watchdog_enabled, 732 .maxlen = sizeof (int), 733 .mode = 0644, 734 .proc_handler = proc_dowatchdog_enabled, 735 }, 736 { 737 .procname = "watchdog_thresh", 738 .data = &softlockup_thresh, 739 .maxlen = sizeof(int), 740 .mode = 0644, 741 .proc_handler = proc_dowatchdog_thresh, 742 .extra1 = &neg_one, 743 .extra2 = &sixty, 744 }, 745 { 746 .procname = "softlockup_panic", 747 .data = &softlockup_panic, 748 .maxlen = sizeof(int), 749 .mode = 0644, 750 .proc_handler = proc_dointvec_minmax, 751 .extra1 = &zero, 752 .extra2 = &one, 753 }, 754 { 755 .procname = "nmi_watchdog", 756 .data = &watchdog_enabled, 757 .maxlen = sizeof (int), 758 .mode = 0644, 759 .proc_handler = proc_dowatchdog_enabled, 760 }, 761 #endif 762 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 763 { 764 .procname = "unknown_nmi_panic", 765 .data = &unknown_nmi_panic, 766 .maxlen = sizeof (int), 767 .mode = 0644, 768 .proc_handler = proc_dointvec, 769 }, 770 #endif 771 #if defined(CONFIG_X86) 772 { 773 .procname = "panic_on_unrecovered_nmi", 774 .data = &panic_on_unrecovered_nmi, 775 .maxlen = sizeof(int), 776 .mode = 0644, 777 .proc_handler = proc_dointvec, 778 }, 779 { 780 .procname = "panic_on_io_nmi", 781 .data = &panic_on_io_nmi, 782 .maxlen = sizeof(int), 783 .mode = 0644, 784 .proc_handler = proc_dointvec, 785 }, 786 { 787 .procname = "bootloader_type", 788 .data = &bootloader_type, 789 .maxlen = sizeof (int), 790 .mode = 0444, 791 .proc_handler = proc_dointvec, 792 }, 793 { 794 .procname = "bootloader_version", 795 .data = &bootloader_version, 796 .maxlen = sizeof (int), 797 .mode = 0444, 798 .proc_handler = proc_dointvec, 799 }, 800 { 801 .procname = "kstack_depth_to_print", 802 .data = &kstack_depth_to_print, 803 .maxlen = sizeof(int), 804 .mode = 0644, 805 .proc_handler = proc_dointvec, 806 }, 807 { 808 .procname = "io_delay_type", 809 .data = &io_delay_type, 810 .maxlen = sizeof(int), 811 .mode = 0644, 812 .proc_handler = proc_dointvec, 813 }, 814 #endif 815 #if defined(CONFIG_MMU) 816 { 817 .procname = "randomize_va_space", 818 .data = &randomize_va_space, 819 .maxlen = sizeof(int), 820 .mode = 0644, 821 .proc_handler = proc_dointvec, 822 }, 823 #endif 824 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 825 { 826 .procname = "spin_retry", 827 .data = &spin_retry, 828 .maxlen = sizeof (int), 829 .mode = 0644, 830 .proc_handler = proc_dointvec, 831 }, 832 #endif 833 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 834 { 835 .procname = "acpi_video_flags", 836 .data = &acpi_realmode_flags, 837 .maxlen = sizeof (unsigned long), 838 .mode = 0644, 839 .proc_handler = proc_doulongvec_minmax, 840 }, 841 #endif 842 #ifdef CONFIG_IA64 843 { 844 .procname = "ignore-unaligned-usertrap", 845 .data = &no_unaligned_warning, 846 .maxlen = sizeof (int), 847 .mode = 0644, 848 .proc_handler = proc_dointvec, 849 }, 850 { 851 .procname = "unaligned-dump-stack", 852 .data = &unaligned_dump_stack, 853 .maxlen = sizeof (int), 854 .mode = 0644, 855 .proc_handler = proc_dointvec, 856 }, 857 #endif 858 #ifdef CONFIG_DETECT_HUNG_TASK 859 { 860 .procname = "hung_task_panic", 861 .data = &sysctl_hung_task_panic, 862 .maxlen = sizeof(int), 863 .mode = 0644, 864 .proc_handler = proc_dointvec_minmax, 865 .extra1 = &zero, 866 .extra2 = &one, 867 }, 868 { 869 .procname = "hung_task_check_count", 870 .data = &sysctl_hung_task_check_count, 871 .maxlen = sizeof(unsigned long), 872 .mode = 0644, 873 .proc_handler = proc_doulongvec_minmax, 874 }, 875 { 876 .procname = "hung_task_timeout_secs", 877 .data = &sysctl_hung_task_timeout_secs, 878 .maxlen = sizeof(unsigned long), 879 .mode = 0644, 880 .proc_handler = proc_dohung_task_timeout_secs, 881 }, 882 { 883 .procname = "hung_task_warnings", 884 .data = &sysctl_hung_task_warnings, 885 .maxlen = sizeof(unsigned long), 886 .mode = 0644, 887 .proc_handler = proc_doulongvec_minmax, 888 }, 889 #endif 890 #ifdef CONFIG_COMPAT 891 { 892 .procname = "compat-log", 893 .data = &compat_log, 894 .maxlen = sizeof (int), 895 .mode = 0644, 896 .proc_handler = proc_dointvec, 897 }, 898 #endif 899 #ifdef CONFIG_RT_MUTEXES 900 { 901 .procname = "max_lock_depth", 902 .data = &max_lock_depth, 903 .maxlen = sizeof(int), 904 .mode = 0644, 905 .proc_handler = proc_dointvec, 906 }, 907 #endif 908 { 909 .procname = "poweroff_cmd", 910 .data = &poweroff_cmd, 911 .maxlen = POWEROFF_CMD_PATH_LEN, 912 .mode = 0644, 913 .proc_handler = proc_dostring, 914 }, 915 #ifdef CONFIG_KEYS 916 { 917 .procname = "keys", 918 .mode = 0555, 919 .child = key_sysctls, 920 }, 921 #endif 922 #ifdef CONFIG_RCU_TORTURE_TEST 923 { 924 .procname = "rcutorture_runnable", 925 .data = &rcutorture_runnable, 926 .maxlen = sizeof(int), 927 .mode = 0644, 928 .proc_handler = proc_dointvec, 929 }, 930 #endif 931 #ifdef CONFIG_PERF_EVENTS 932 { 933 .procname = "perf_event_paranoid", 934 .data = &sysctl_perf_event_paranoid, 935 .maxlen = sizeof(sysctl_perf_event_paranoid), 936 .mode = 0644, 937 .proc_handler = proc_dointvec, 938 }, 939 { 940 .procname = "perf_event_mlock_kb", 941 .data = &sysctl_perf_event_mlock, 942 .maxlen = sizeof(sysctl_perf_event_mlock), 943 .mode = 0644, 944 .proc_handler = proc_dointvec, 945 }, 946 { 947 .procname = "perf_event_max_sample_rate", 948 .data = &sysctl_perf_event_sample_rate, 949 .maxlen = sizeof(sysctl_perf_event_sample_rate), 950 .mode = 0644, 951 .proc_handler = proc_dointvec, 952 }, 953 #endif 954 #ifdef CONFIG_KMEMCHECK 955 { 956 .procname = "kmemcheck", 957 .data = &kmemcheck_enabled, 958 .maxlen = sizeof(int), 959 .mode = 0644, 960 .proc_handler = proc_dointvec, 961 }, 962 #endif 963 #ifdef CONFIG_BLOCK 964 { 965 .procname = "blk_iopoll", 966 .data = &blk_iopoll_enabled, 967 .maxlen = sizeof(int), 968 .mode = 0644, 969 .proc_handler = proc_dointvec, 970 }, 971 #endif 972 { } 973 }; 974 975 static struct ctl_table vm_table[] = { 976 { 977 .procname = "overcommit_memory", 978 .data = &sysctl_overcommit_memory, 979 .maxlen = sizeof(sysctl_overcommit_memory), 980 .mode = 0644, 981 .proc_handler = proc_dointvec, 982 }, 983 { 984 .procname = "panic_on_oom", 985 .data = &sysctl_panic_on_oom, 986 .maxlen = sizeof(sysctl_panic_on_oom), 987 .mode = 0644, 988 .proc_handler = proc_dointvec, 989 }, 990 { 991 .procname = "oom_kill_allocating_task", 992 .data = &sysctl_oom_kill_allocating_task, 993 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 994 .mode = 0644, 995 .proc_handler = proc_dointvec, 996 }, 997 { 998 .procname = "oom_dump_tasks", 999 .data = &sysctl_oom_dump_tasks, 1000 .maxlen = sizeof(sysctl_oom_dump_tasks), 1001 .mode = 0644, 1002 .proc_handler = proc_dointvec, 1003 }, 1004 { 1005 .procname = "overcommit_ratio", 1006 .data = &sysctl_overcommit_ratio, 1007 .maxlen = sizeof(sysctl_overcommit_ratio), 1008 .mode = 0644, 1009 .proc_handler = proc_dointvec, 1010 }, 1011 { 1012 .procname = "page-cluster", 1013 .data = &page_cluster, 1014 .maxlen = sizeof(int), 1015 .mode = 0644, 1016 .proc_handler = proc_dointvec, 1017 }, 1018 { 1019 .procname = "dirty_background_ratio", 1020 .data = &dirty_background_ratio, 1021 .maxlen = sizeof(dirty_background_ratio), 1022 .mode = 0644, 1023 .proc_handler = dirty_background_ratio_handler, 1024 .extra1 = &zero, 1025 .extra2 = &one_hundred, 1026 }, 1027 { 1028 .procname = "dirty_background_bytes", 1029 .data = &dirty_background_bytes, 1030 .maxlen = sizeof(dirty_background_bytes), 1031 .mode = 0644, 1032 .proc_handler = dirty_background_bytes_handler, 1033 .extra1 = &one_ul, 1034 }, 1035 { 1036 .procname = "dirty_ratio", 1037 .data = &vm_dirty_ratio, 1038 .maxlen = sizeof(vm_dirty_ratio), 1039 .mode = 0644, 1040 .proc_handler = dirty_ratio_handler, 1041 .extra1 = &zero, 1042 .extra2 = &one_hundred, 1043 }, 1044 { 1045 .procname = "dirty_bytes", 1046 .data = &vm_dirty_bytes, 1047 .maxlen = sizeof(vm_dirty_bytes), 1048 .mode = 0644, 1049 .proc_handler = dirty_bytes_handler, 1050 .extra1 = &dirty_bytes_min, 1051 }, 1052 { 1053 .procname = "dirty_writeback_centisecs", 1054 .data = &dirty_writeback_interval, 1055 .maxlen = sizeof(dirty_writeback_interval), 1056 .mode = 0644, 1057 .proc_handler = dirty_writeback_centisecs_handler, 1058 }, 1059 { 1060 .procname = "dirty_expire_centisecs", 1061 .data = &dirty_expire_interval, 1062 .maxlen = sizeof(dirty_expire_interval), 1063 .mode = 0644, 1064 .proc_handler = proc_dointvec, 1065 }, 1066 { 1067 .procname = "nr_pdflush_threads", 1068 .data = &nr_pdflush_threads, 1069 .maxlen = sizeof nr_pdflush_threads, 1070 .mode = 0444 /* read-only*/, 1071 .proc_handler = proc_dointvec, 1072 }, 1073 { 1074 .procname = "swappiness", 1075 .data = &vm_swappiness, 1076 .maxlen = sizeof(vm_swappiness), 1077 .mode = 0644, 1078 .proc_handler = proc_dointvec_minmax, 1079 .extra1 = &zero, 1080 .extra2 = &one_hundred, 1081 }, 1082 #ifdef CONFIG_HUGETLB_PAGE 1083 { 1084 .procname = "nr_hugepages", 1085 .data = NULL, 1086 .maxlen = sizeof(unsigned long), 1087 .mode = 0644, 1088 .proc_handler = hugetlb_sysctl_handler, 1089 .extra1 = (void *)&hugetlb_zero, 1090 .extra2 = (void *)&hugetlb_infinity, 1091 }, 1092 #ifdef CONFIG_NUMA 1093 { 1094 .procname = "nr_hugepages_mempolicy", 1095 .data = NULL, 1096 .maxlen = sizeof(unsigned long), 1097 .mode = 0644, 1098 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1099 .extra1 = (void *)&hugetlb_zero, 1100 .extra2 = (void *)&hugetlb_infinity, 1101 }, 1102 #endif 1103 { 1104 .procname = "hugetlb_shm_group", 1105 .data = &sysctl_hugetlb_shm_group, 1106 .maxlen = sizeof(gid_t), 1107 .mode = 0644, 1108 .proc_handler = proc_dointvec, 1109 }, 1110 { 1111 .procname = "hugepages_treat_as_movable", 1112 .data = &hugepages_treat_as_movable, 1113 .maxlen = sizeof(int), 1114 .mode = 0644, 1115 .proc_handler = hugetlb_treat_movable_handler, 1116 }, 1117 { 1118 .procname = "nr_overcommit_hugepages", 1119 .data = NULL, 1120 .maxlen = sizeof(unsigned long), 1121 .mode = 0644, 1122 .proc_handler = hugetlb_overcommit_handler, 1123 .extra1 = (void *)&hugetlb_zero, 1124 .extra2 = (void *)&hugetlb_infinity, 1125 }, 1126 #endif 1127 { 1128 .procname = "lowmem_reserve_ratio", 1129 .data = &sysctl_lowmem_reserve_ratio, 1130 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1131 .mode = 0644, 1132 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1133 }, 1134 { 1135 .procname = "drop_caches", 1136 .data = &sysctl_drop_caches, 1137 .maxlen = sizeof(int), 1138 .mode = 0644, 1139 .proc_handler = drop_caches_sysctl_handler, 1140 }, 1141 #ifdef CONFIG_COMPACTION 1142 { 1143 .procname = "compact_memory", 1144 .data = &sysctl_compact_memory, 1145 .maxlen = sizeof(int), 1146 .mode = 0200, 1147 .proc_handler = sysctl_compaction_handler, 1148 }, 1149 { 1150 .procname = "extfrag_threshold", 1151 .data = &sysctl_extfrag_threshold, 1152 .maxlen = sizeof(int), 1153 .mode = 0644, 1154 .proc_handler = sysctl_extfrag_handler, 1155 .extra1 = &min_extfrag_threshold, 1156 .extra2 = &max_extfrag_threshold, 1157 }, 1158 1159 #endif /* CONFIG_COMPACTION */ 1160 { 1161 .procname = "min_free_kbytes", 1162 .data = &min_free_kbytes, 1163 .maxlen = sizeof(min_free_kbytes), 1164 .mode = 0644, 1165 .proc_handler = min_free_kbytes_sysctl_handler, 1166 .extra1 = &zero, 1167 }, 1168 { 1169 .procname = "percpu_pagelist_fraction", 1170 .data = &percpu_pagelist_fraction, 1171 .maxlen = sizeof(percpu_pagelist_fraction), 1172 .mode = 0644, 1173 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1174 .extra1 = &min_percpu_pagelist_fract, 1175 }, 1176 #ifdef CONFIG_MMU 1177 { 1178 .procname = "max_map_count", 1179 .data = &sysctl_max_map_count, 1180 .maxlen = sizeof(sysctl_max_map_count), 1181 .mode = 0644, 1182 .proc_handler = proc_dointvec_minmax, 1183 .extra1 = &zero, 1184 }, 1185 #else 1186 { 1187 .procname = "nr_trim_pages", 1188 .data = &sysctl_nr_trim_pages, 1189 .maxlen = sizeof(sysctl_nr_trim_pages), 1190 .mode = 0644, 1191 .proc_handler = proc_dointvec_minmax, 1192 .extra1 = &zero, 1193 }, 1194 #endif 1195 { 1196 .procname = "laptop_mode", 1197 .data = &laptop_mode, 1198 .maxlen = sizeof(laptop_mode), 1199 .mode = 0644, 1200 .proc_handler = proc_dointvec_jiffies, 1201 }, 1202 { 1203 .procname = "block_dump", 1204 .data = &block_dump, 1205 .maxlen = sizeof(block_dump), 1206 .mode = 0644, 1207 .proc_handler = proc_dointvec, 1208 .extra1 = &zero, 1209 }, 1210 { 1211 .procname = "vfs_cache_pressure", 1212 .data = &sysctl_vfs_cache_pressure, 1213 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1214 .mode = 0644, 1215 .proc_handler = proc_dointvec, 1216 .extra1 = &zero, 1217 }, 1218 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1219 { 1220 .procname = "legacy_va_layout", 1221 .data = &sysctl_legacy_va_layout, 1222 .maxlen = sizeof(sysctl_legacy_va_layout), 1223 .mode = 0644, 1224 .proc_handler = proc_dointvec, 1225 .extra1 = &zero, 1226 }, 1227 #endif 1228 #ifdef CONFIG_NUMA 1229 { 1230 .procname = "zone_reclaim_mode", 1231 .data = &zone_reclaim_mode, 1232 .maxlen = sizeof(zone_reclaim_mode), 1233 .mode = 0644, 1234 .proc_handler = proc_dointvec, 1235 .extra1 = &zero, 1236 }, 1237 { 1238 .procname = "min_unmapped_ratio", 1239 .data = &sysctl_min_unmapped_ratio, 1240 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1241 .mode = 0644, 1242 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1243 .extra1 = &zero, 1244 .extra2 = &one_hundred, 1245 }, 1246 { 1247 .procname = "min_slab_ratio", 1248 .data = &sysctl_min_slab_ratio, 1249 .maxlen = sizeof(sysctl_min_slab_ratio), 1250 .mode = 0644, 1251 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1252 .extra1 = &zero, 1253 .extra2 = &one_hundred, 1254 }, 1255 #endif 1256 #ifdef CONFIG_SMP 1257 { 1258 .procname = "stat_interval", 1259 .data = &sysctl_stat_interval, 1260 .maxlen = sizeof(sysctl_stat_interval), 1261 .mode = 0644, 1262 .proc_handler = proc_dointvec_jiffies, 1263 }, 1264 #endif 1265 #ifdef CONFIG_MMU 1266 { 1267 .procname = "mmap_min_addr", 1268 .data = &dac_mmap_min_addr, 1269 .maxlen = sizeof(unsigned long), 1270 .mode = 0644, 1271 .proc_handler = mmap_min_addr_handler, 1272 }, 1273 #endif 1274 #ifdef CONFIG_NUMA 1275 { 1276 .procname = "numa_zonelist_order", 1277 .data = &numa_zonelist_order, 1278 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1279 .mode = 0644, 1280 .proc_handler = numa_zonelist_order_handler, 1281 }, 1282 #endif 1283 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1284 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1285 { 1286 .procname = "vdso_enabled", 1287 .data = &vdso_enabled, 1288 .maxlen = sizeof(vdso_enabled), 1289 .mode = 0644, 1290 .proc_handler = proc_dointvec, 1291 .extra1 = &zero, 1292 }, 1293 #endif 1294 #ifdef CONFIG_HIGHMEM 1295 { 1296 .procname = "highmem_is_dirtyable", 1297 .data = &vm_highmem_is_dirtyable, 1298 .maxlen = sizeof(vm_highmem_is_dirtyable), 1299 .mode = 0644, 1300 .proc_handler = proc_dointvec_minmax, 1301 .extra1 = &zero, 1302 .extra2 = &one, 1303 }, 1304 #endif 1305 { 1306 .procname = "scan_unevictable_pages", 1307 .data = &scan_unevictable_pages, 1308 .maxlen = sizeof(scan_unevictable_pages), 1309 .mode = 0644, 1310 .proc_handler = scan_unevictable_handler, 1311 }, 1312 #ifdef CONFIG_MEMORY_FAILURE 1313 { 1314 .procname = "memory_failure_early_kill", 1315 .data = &sysctl_memory_failure_early_kill, 1316 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1317 .mode = 0644, 1318 .proc_handler = proc_dointvec_minmax, 1319 .extra1 = &zero, 1320 .extra2 = &one, 1321 }, 1322 { 1323 .procname = "memory_failure_recovery", 1324 .data = &sysctl_memory_failure_recovery, 1325 .maxlen = sizeof(sysctl_memory_failure_recovery), 1326 .mode = 0644, 1327 .proc_handler = proc_dointvec_minmax, 1328 .extra1 = &zero, 1329 .extra2 = &one, 1330 }, 1331 #endif 1332 { } 1333 }; 1334 1335 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1336 static struct ctl_table binfmt_misc_table[] = { 1337 { } 1338 }; 1339 #endif 1340 1341 static struct ctl_table fs_table[] = { 1342 { 1343 .procname = "inode-nr", 1344 .data = &inodes_stat, 1345 .maxlen = 2*sizeof(int), 1346 .mode = 0444, 1347 .proc_handler = proc_nr_inodes, 1348 }, 1349 { 1350 .procname = "inode-state", 1351 .data = &inodes_stat, 1352 .maxlen = 7*sizeof(int), 1353 .mode = 0444, 1354 .proc_handler = proc_nr_inodes, 1355 }, 1356 { 1357 .procname = "file-nr", 1358 .data = &files_stat, 1359 .maxlen = sizeof(files_stat), 1360 .mode = 0444, 1361 .proc_handler = proc_nr_files, 1362 }, 1363 { 1364 .procname = "file-max", 1365 .data = &files_stat.max_files, 1366 .maxlen = sizeof(files_stat.max_files), 1367 .mode = 0644, 1368 .proc_handler = proc_doulongvec_minmax, 1369 }, 1370 { 1371 .procname = "nr_open", 1372 .data = &sysctl_nr_open, 1373 .maxlen = sizeof(int), 1374 .mode = 0644, 1375 .proc_handler = proc_dointvec_minmax, 1376 .extra1 = &sysctl_nr_open_min, 1377 .extra2 = &sysctl_nr_open_max, 1378 }, 1379 { 1380 .procname = "dentry-state", 1381 .data = &dentry_stat, 1382 .maxlen = 6*sizeof(int), 1383 .mode = 0444, 1384 .proc_handler = proc_nr_dentry, 1385 }, 1386 { 1387 .procname = "overflowuid", 1388 .data = &fs_overflowuid, 1389 .maxlen = sizeof(int), 1390 .mode = 0644, 1391 .proc_handler = proc_dointvec_minmax, 1392 .extra1 = &minolduid, 1393 .extra2 = &maxolduid, 1394 }, 1395 { 1396 .procname = "overflowgid", 1397 .data = &fs_overflowgid, 1398 .maxlen = sizeof(int), 1399 .mode = 0644, 1400 .proc_handler = proc_dointvec_minmax, 1401 .extra1 = &minolduid, 1402 .extra2 = &maxolduid, 1403 }, 1404 #ifdef CONFIG_FILE_LOCKING 1405 { 1406 .procname = "leases-enable", 1407 .data = &leases_enable, 1408 .maxlen = sizeof(int), 1409 .mode = 0644, 1410 .proc_handler = proc_dointvec, 1411 }, 1412 #endif 1413 #ifdef CONFIG_DNOTIFY 1414 { 1415 .procname = "dir-notify-enable", 1416 .data = &dir_notify_enable, 1417 .maxlen = sizeof(int), 1418 .mode = 0644, 1419 .proc_handler = proc_dointvec, 1420 }, 1421 #endif 1422 #ifdef CONFIG_MMU 1423 #ifdef CONFIG_FILE_LOCKING 1424 { 1425 .procname = "lease-break-time", 1426 .data = &lease_break_time, 1427 .maxlen = sizeof(int), 1428 .mode = 0644, 1429 .proc_handler = proc_dointvec, 1430 }, 1431 #endif 1432 #ifdef CONFIG_AIO 1433 { 1434 .procname = "aio-nr", 1435 .data = &aio_nr, 1436 .maxlen = sizeof(aio_nr), 1437 .mode = 0444, 1438 .proc_handler = proc_doulongvec_minmax, 1439 }, 1440 { 1441 .procname = "aio-max-nr", 1442 .data = &aio_max_nr, 1443 .maxlen = sizeof(aio_max_nr), 1444 .mode = 0644, 1445 .proc_handler = proc_doulongvec_minmax, 1446 }, 1447 #endif /* CONFIG_AIO */ 1448 #ifdef CONFIG_INOTIFY_USER 1449 { 1450 .procname = "inotify", 1451 .mode = 0555, 1452 .child = inotify_table, 1453 }, 1454 #endif 1455 #ifdef CONFIG_EPOLL 1456 { 1457 .procname = "epoll", 1458 .mode = 0555, 1459 .child = epoll_table, 1460 }, 1461 #endif 1462 #endif 1463 { 1464 .procname = "suid_dumpable", 1465 .data = &suid_dumpable, 1466 .maxlen = sizeof(int), 1467 .mode = 0644, 1468 .proc_handler = proc_dointvec_minmax, 1469 .extra1 = &zero, 1470 .extra2 = &two, 1471 }, 1472 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1473 { 1474 .procname = "binfmt_misc", 1475 .mode = 0555, 1476 .child = binfmt_misc_table, 1477 }, 1478 #endif 1479 { 1480 .procname = "pipe-max-size", 1481 .data = &pipe_max_size, 1482 .maxlen = sizeof(int), 1483 .mode = 0644, 1484 .proc_handler = &pipe_proc_fn, 1485 .extra1 = &pipe_min_size, 1486 }, 1487 { } 1488 }; 1489 1490 static struct ctl_table debug_table[] = { 1491 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1492 defined(CONFIG_S390) 1493 { 1494 .procname = "exception-trace", 1495 .data = &show_unhandled_signals, 1496 .maxlen = sizeof(int), 1497 .mode = 0644, 1498 .proc_handler = proc_dointvec 1499 }, 1500 #endif 1501 #if defined(CONFIG_OPTPROBES) 1502 { 1503 .procname = "kprobes-optimization", 1504 .data = &sysctl_kprobes_optimization, 1505 .maxlen = sizeof(int), 1506 .mode = 0644, 1507 .proc_handler = proc_kprobes_optimization_handler, 1508 .extra1 = &zero, 1509 .extra2 = &one, 1510 }, 1511 #endif 1512 { } 1513 }; 1514 1515 static struct ctl_table dev_table[] = { 1516 { } 1517 }; 1518 1519 static DEFINE_SPINLOCK(sysctl_lock); 1520 1521 /* called under sysctl_lock */ 1522 static int use_table(struct ctl_table_header *p) 1523 { 1524 if (unlikely(p->unregistering)) 1525 return 0; 1526 p->used++; 1527 return 1; 1528 } 1529 1530 /* called under sysctl_lock */ 1531 static void unuse_table(struct ctl_table_header *p) 1532 { 1533 if (!--p->used) 1534 if (unlikely(p->unregistering)) 1535 complete(p->unregistering); 1536 } 1537 1538 /* called under sysctl_lock, will reacquire if has to wait */ 1539 static void start_unregistering(struct ctl_table_header *p) 1540 { 1541 /* 1542 * if p->used is 0, nobody will ever touch that entry again; 1543 * we'll eliminate all paths to it before dropping sysctl_lock 1544 */ 1545 if (unlikely(p->used)) { 1546 struct completion wait; 1547 init_completion(&wait); 1548 p->unregistering = &wait; 1549 spin_unlock(&sysctl_lock); 1550 wait_for_completion(&wait); 1551 spin_lock(&sysctl_lock); 1552 } else { 1553 /* anything non-NULL; we'll never dereference it */ 1554 p->unregistering = ERR_PTR(-EINVAL); 1555 } 1556 /* 1557 * do not remove from the list until nobody holds it; walking the 1558 * list in do_sysctl() relies on that. 1559 */ 1560 list_del_init(&p->ctl_entry); 1561 } 1562 1563 void sysctl_head_get(struct ctl_table_header *head) 1564 { 1565 spin_lock(&sysctl_lock); 1566 head->count++; 1567 spin_unlock(&sysctl_lock); 1568 } 1569 1570 static void free_head(struct rcu_head *rcu) 1571 { 1572 kfree(container_of(rcu, struct ctl_table_header, rcu)); 1573 } 1574 1575 void sysctl_head_put(struct ctl_table_header *head) 1576 { 1577 spin_lock(&sysctl_lock); 1578 if (!--head->count) 1579 call_rcu(&head->rcu, free_head); 1580 spin_unlock(&sysctl_lock); 1581 } 1582 1583 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1584 { 1585 if (!head) 1586 BUG(); 1587 spin_lock(&sysctl_lock); 1588 if (!use_table(head)) 1589 head = ERR_PTR(-ENOENT); 1590 spin_unlock(&sysctl_lock); 1591 return head; 1592 } 1593 1594 void sysctl_head_finish(struct ctl_table_header *head) 1595 { 1596 if (!head) 1597 return; 1598 spin_lock(&sysctl_lock); 1599 unuse_table(head); 1600 spin_unlock(&sysctl_lock); 1601 } 1602 1603 static struct ctl_table_set * 1604 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1605 { 1606 struct ctl_table_set *set = &root->default_set; 1607 if (root->lookup) 1608 set = root->lookup(root, namespaces); 1609 return set; 1610 } 1611 1612 static struct list_head * 1613 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1614 { 1615 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1616 return &set->list; 1617 } 1618 1619 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1620 struct ctl_table_header *prev) 1621 { 1622 struct ctl_table_root *root; 1623 struct list_head *header_list; 1624 struct ctl_table_header *head; 1625 struct list_head *tmp; 1626 1627 spin_lock(&sysctl_lock); 1628 if (prev) { 1629 head = prev; 1630 tmp = &prev->ctl_entry; 1631 unuse_table(prev); 1632 goto next; 1633 } 1634 tmp = &root_table_header.ctl_entry; 1635 for (;;) { 1636 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1637 1638 if (!use_table(head)) 1639 goto next; 1640 spin_unlock(&sysctl_lock); 1641 return head; 1642 next: 1643 root = head->root; 1644 tmp = tmp->next; 1645 header_list = lookup_header_list(root, namespaces); 1646 if (tmp != header_list) 1647 continue; 1648 1649 do { 1650 root = list_entry(root->root_list.next, 1651 struct ctl_table_root, root_list); 1652 if (root == &sysctl_table_root) 1653 goto out; 1654 header_list = lookup_header_list(root, namespaces); 1655 } while (list_empty(header_list)); 1656 tmp = header_list->next; 1657 } 1658 out: 1659 spin_unlock(&sysctl_lock); 1660 return NULL; 1661 } 1662 1663 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1664 { 1665 return __sysctl_head_next(current->nsproxy, prev); 1666 } 1667 1668 void register_sysctl_root(struct ctl_table_root *root) 1669 { 1670 spin_lock(&sysctl_lock); 1671 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1672 spin_unlock(&sysctl_lock); 1673 } 1674 1675 /* 1676 * sysctl_perm does NOT grant the superuser all rights automatically, because 1677 * some sysctl variables are readonly even to root. 1678 */ 1679 1680 static int test_perm(int mode, int op) 1681 { 1682 if (!current_euid()) 1683 mode >>= 6; 1684 else if (in_egroup_p(0)) 1685 mode >>= 3; 1686 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1687 return 0; 1688 return -EACCES; 1689 } 1690 1691 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1692 { 1693 int error; 1694 int mode; 1695 1696 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1697 if (error) 1698 return error; 1699 1700 if (root->permissions) 1701 mode = root->permissions(root, current->nsproxy, table); 1702 else 1703 mode = table->mode; 1704 1705 return test_perm(mode, op); 1706 } 1707 1708 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1709 { 1710 for (; table->procname; table++) { 1711 table->parent = parent; 1712 if (table->child) 1713 sysctl_set_parent(table, table->child); 1714 } 1715 } 1716 1717 static __init int sysctl_init(void) 1718 { 1719 sysctl_set_parent(NULL, root_table); 1720 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1721 sysctl_check_table(current->nsproxy, root_table); 1722 #endif 1723 return 0; 1724 } 1725 1726 core_initcall(sysctl_init); 1727 1728 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1729 struct ctl_table *table) 1730 { 1731 struct ctl_table *p; 1732 const char *s = branch->procname; 1733 1734 /* branch should have named subdirectory as its first element */ 1735 if (!s || !branch->child) 1736 return NULL; 1737 1738 /* ... and nothing else */ 1739 if (branch[1].procname) 1740 return NULL; 1741 1742 /* table should contain subdirectory with the same name */ 1743 for (p = table; p->procname; p++) { 1744 if (!p->child) 1745 continue; 1746 if (p->procname && strcmp(p->procname, s) == 0) 1747 return p; 1748 } 1749 return NULL; 1750 } 1751 1752 /* see if attaching q to p would be an improvement */ 1753 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1754 { 1755 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1756 struct ctl_table *next; 1757 int is_better = 0; 1758 int not_in_parent = !p->attached_by; 1759 1760 while ((next = is_branch_in(by, to)) != NULL) { 1761 if (by == q->attached_by) 1762 is_better = 1; 1763 if (to == p->attached_by) 1764 not_in_parent = 1; 1765 by = by->child; 1766 to = next->child; 1767 } 1768 1769 if (is_better && not_in_parent) { 1770 q->attached_by = by; 1771 q->attached_to = to; 1772 q->parent = p; 1773 } 1774 } 1775 1776 /** 1777 * __register_sysctl_paths - register a sysctl hierarchy 1778 * @root: List of sysctl headers to register on 1779 * @namespaces: Data to compute which lists of sysctl entries are visible 1780 * @path: The path to the directory the sysctl table is in. 1781 * @table: the top-level table structure 1782 * 1783 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1784 * array. A completely 0 filled entry terminates the table. 1785 * 1786 * The members of the &struct ctl_table structure are used as follows: 1787 * 1788 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1789 * enter a sysctl file 1790 * 1791 * data - a pointer to data for use by proc_handler 1792 * 1793 * maxlen - the maximum size in bytes of the data 1794 * 1795 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1796 * 1797 * child - a pointer to the child sysctl table if this entry is a directory, or 1798 * %NULL. 1799 * 1800 * proc_handler - the text handler routine (described below) 1801 * 1802 * de - for internal use by the sysctl routines 1803 * 1804 * extra1, extra2 - extra pointers usable by the proc handler routines 1805 * 1806 * Leaf nodes in the sysctl tree will be represented by a single file 1807 * under /proc; non-leaf nodes will be represented by directories. 1808 * 1809 * sysctl(2) can automatically manage read and write requests through 1810 * the sysctl table. The data and maxlen fields of the ctl_table 1811 * struct enable minimal validation of the values being written to be 1812 * performed, and the mode field allows minimal authentication. 1813 * 1814 * There must be a proc_handler routine for any terminal nodes 1815 * mirrored under /proc/sys (non-terminals are handled by a built-in 1816 * directory handler). Several default handlers are available to 1817 * cover common cases - 1818 * 1819 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1820 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1821 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1822 * 1823 * It is the handler's job to read the input buffer from user memory 1824 * and process it. The handler should return 0 on success. 1825 * 1826 * This routine returns %NULL on a failure to register, and a pointer 1827 * to the table header on success. 1828 */ 1829 struct ctl_table_header *__register_sysctl_paths( 1830 struct ctl_table_root *root, 1831 struct nsproxy *namespaces, 1832 const struct ctl_path *path, struct ctl_table *table) 1833 { 1834 struct ctl_table_header *header; 1835 struct ctl_table *new, **prevp; 1836 unsigned int n, npath; 1837 struct ctl_table_set *set; 1838 1839 /* Count the path components */ 1840 for (npath = 0; path[npath].procname; ++npath) 1841 ; 1842 1843 /* 1844 * For each path component, allocate a 2-element ctl_table array. 1845 * The first array element will be filled with the sysctl entry 1846 * for this, the second will be the sentinel (procname == 0). 1847 * 1848 * We allocate everything in one go so that we don't have to 1849 * worry about freeing additional memory in unregister_sysctl_table. 1850 */ 1851 header = kzalloc(sizeof(struct ctl_table_header) + 1852 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1853 if (!header) 1854 return NULL; 1855 1856 new = (struct ctl_table *) (header + 1); 1857 1858 /* Now connect the dots */ 1859 prevp = &header->ctl_table; 1860 for (n = 0; n < npath; ++n, ++path) { 1861 /* Copy the procname */ 1862 new->procname = path->procname; 1863 new->mode = 0555; 1864 1865 *prevp = new; 1866 prevp = &new->child; 1867 1868 new += 2; 1869 } 1870 *prevp = table; 1871 header->ctl_table_arg = table; 1872 1873 INIT_LIST_HEAD(&header->ctl_entry); 1874 header->used = 0; 1875 header->unregistering = NULL; 1876 header->root = root; 1877 sysctl_set_parent(NULL, header->ctl_table); 1878 header->count = 1; 1879 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1880 if (sysctl_check_table(namespaces, header->ctl_table)) { 1881 kfree(header); 1882 return NULL; 1883 } 1884 #endif 1885 spin_lock(&sysctl_lock); 1886 header->set = lookup_header_set(root, namespaces); 1887 header->attached_by = header->ctl_table; 1888 header->attached_to = root_table; 1889 header->parent = &root_table_header; 1890 for (set = header->set; set; set = set->parent) { 1891 struct ctl_table_header *p; 1892 list_for_each_entry(p, &set->list, ctl_entry) { 1893 if (p->unregistering) 1894 continue; 1895 try_attach(p, header); 1896 } 1897 } 1898 header->parent->count++; 1899 list_add_tail(&header->ctl_entry, &header->set->list); 1900 spin_unlock(&sysctl_lock); 1901 1902 return header; 1903 } 1904 1905 /** 1906 * register_sysctl_table_path - register a sysctl table hierarchy 1907 * @path: The path to the directory the sysctl table is in. 1908 * @table: the top-level table structure 1909 * 1910 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1911 * array. A completely 0 filled entry terminates the table. 1912 * 1913 * See __register_sysctl_paths for more details. 1914 */ 1915 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1916 struct ctl_table *table) 1917 { 1918 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1919 path, table); 1920 } 1921 1922 /** 1923 * register_sysctl_table - register a sysctl table hierarchy 1924 * @table: the top-level table structure 1925 * 1926 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1927 * array. A completely 0 filled entry terminates the table. 1928 * 1929 * See register_sysctl_paths for more details. 1930 */ 1931 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1932 { 1933 static const struct ctl_path null_path[] = { {} }; 1934 1935 return register_sysctl_paths(null_path, table); 1936 } 1937 1938 /** 1939 * unregister_sysctl_table - unregister a sysctl table hierarchy 1940 * @header: the header returned from register_sysctl_table 1941 * 1942 * Unregisters the sysctl table and all children. proc entries may not 1943 * actually be removed until they are no longer used by anyone. 1944 */ 1945 void unregister_sysctl_table(struct ctl_table_header * header) 1946 { 1947 might_sleep(); 1948 1949 if (header == NULL) 1950 return; 1951 1952 spin_lock(&sysctl_lock); 1953 start_unregistering(header); 1954 if (!--header->parent->count) { 1955 WARN_ON(1); 1956 call_rcu(&header->parent->rcu, free_head); 1957 } 1958 if (!--header->count) 1959 call_rcu(&header->rcu, free_head); 1960 spin_unlock(&sysctl_lock); 1961 } 1962 1963 int sysctl_is_seen(struct ctl_table_header *p) 1964 { 1965 struct ctl_table_set *set = p->set; 1966 int res; 1967 spin_lock(&sysctl_lock); 1968 if (p->unregistering) 1969 res = 0; 1970 else if (!set->is_seen) 1971 res = 1; 1972 else 1973 res = set->is_seen(set); 1974 spin_unlock(&sysctl_lock); 1975 return res; 1976 } 1977 1978 void setup_sysctl_set(struct ctl_table_set *p, 1979 struct ctl_table_set *parent, 1980 int (*is_seen)(struct ctl_table_set *)) 1981 { 1982 INIT_LIST_HEAD(&p->list); 1983 p->parent = parent ? parent : &sysctl_table_root.default_set; 1984 p->is_seen = is_seen; 1985 } 1986 1987 #else /* !CONFIG_SYSCTL */ 1988 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1989 { 1990 return NULL; 1991 } 1992 1993 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1994 struct ctl_table *table) 1995 { 1996 return NULL; 1997 } 1998 1999 void unregister_sysctl_table(struct ctl_table_header * table) 2000 { 2001 } 2002 2003 void setup_sysctl_set(struct ctl_table_set *p, 2004 struct ctl_table_set *parent, 2005 int (*is_seen)(struct ctl_table_set *)) 2006 { 2007 } 2008 2009 void sysctl_head_put(struct ctl_table_header *head) 2010 { 2011 } 2012 2013 #endif /* CONFIG_SYSCTL */ 2014 2015 /* 2016 * /proc/sys support 2017 */ 2018 2019 #ifdef CONFIG_PROC_SYSCTL 2020 2021 static int _proc_do_string(void* data, int maxlen, int write, 2022 void __user *buffer, 2023 size_t *lenp, loff_t *ppos) 2024 { 2025 size_t len; 2026 char __user *p; 2027 char c; 2028 2029 if (!data || !maxlen || !*lenp) { 2030 *lenp = 0; 2031 return 0; 2032 } 2033 2034 if (write) { 2035 len = 0; 2036 p = buffer; 2037 while (len < *lenp) { 2038 if (get_user(c, p++)) 2039 return -EFAULT; 2040 if (c == 0 || c == '\n') 2041 break; 2042 len++; 2043 } 2044 if (len >= maxlen) 2045 len = maxlen-1; 2046 if(copy_from_user(data, buffer, len)) 2047 return -EFAULT; 2048 ((char *) data)[len] = 0; 2049 *ppos += *lenp; 2050 } else { 2051 len = strlen(data); 2052 if (len > maxlen) 2053 len = maxlen; 2054 2055 if (*ppos > len) { 2056 *lenp = 0; 2057 return 0; 2058 } 2059 2060 data += *ppos; 2061 len -= *ppos; 2062 2063 if (len > *lenp) 2064 len = *lenp; 2065 if (len) 2066 if(copy_to_user(buffer, data, len)) 2067 return -EFAULT; 2068 if (len < *lenp) { 2069 if(put_user('\n', ((char __user *) buffer) + len)) 2070 return -EFAULT; 2071 len++; 2072 } 2073 *lenp = len; 2074 *ppos += len; 2075 } 2076 return 0; 2077 } 2078 2079 /** 2080 * proc_dostring - read a string sysctl 2081 * @table: the sysctl table 2082 * @write: %TRUE if this is a write to the sysctl file 2083 * @buffer: the user buffer 2084 * @lenp: the size of the user buffer 2085 * @ppos: file position 2086 * 2087 * Reads/writes a string from/to the user buffer. If the kernel 2088 * buffer provided is not large enough to hold the string, the 2089 * string is truncated. The copied string is %NULL-terminated. 2090 * If the string is being read by the user process, it is copied 2091 * and a newline '\n' is added. It is truncated if the buffer is 2092 * not large enough. 2093 * 2094 * Returns 0 on success. 2095 */ 2096 int proc_dostring(struct ctl_table *table, int write, 2097 void __user *buffer, size_t *lenp, loff_t *ppos) 2098 { 2099 return _proc_do_string(table->data, table->maxlen, write, 2100 buffer, lenp, ppos); 2101 } 2102 2103 static size_t proc_skip_spaces(char **buf) 2104 { 2105 size_t ret; 2106 char *tmp = skip_spaces(*buf); 2107 ret = tmp - *buf; 2108 *buf = tmp; 2109 return ret; 2110 } 2111 2112 static void proc_skip_char(char **buf, size_t *size, const char v) 2113 { 2114 while (*size) { 2115 if (**buf != v) 2116 break; 2117 (*size)--; 2118 (*buf)++; 2119 } 2120 } 2121 2122 #define TMPBUFLEN 22 2123 /** 2124 * proc_get_long - reads an ASCII formatted integer from a user buffer 2125 * 2126 * @buf: a kernel buffer 2127 * @size: size of the kernel buffer 2128 * @val: this is where the number will be stored 2129 * @neg: set to %TRUE if number is negative 2130 * @perm_tr: a vector which contains the allowed trailers 2131 * @perm_tr_len: size of the perm_tr vector 2132 * @tr: pointer to store the trailer character 2133 * 2134 * In case of success %0 is returned and @buf and @size are updated with 2135 * the amount of bytes read. If @tr is non-NULL and a trailing 2136 * character exists (size is non-zero after returning from this 2137 * function), @tr is updated with the trailing character. 2138 */ 2139 static int proc_get_long(char **buf, size_t *size, 2140 unsigned long *val, bool *neg, 2141 const char *perm_tr, unsigned perm_tr_len, char *tr) 2142 { 2143 int len; 2144 char *p, tmp[TMPBUFLEN]; 2145 2146 if (!*size) 2147 return -EINVAL; 2148 2149 len = *size; 2150 if (len > TMPBUFLEN - 1) 2151 len = TMPBUFLEN - 1; 2152 2153 memcpy(tmp, *buf, len); 2154 2155 tmp[len] = 0; 2156 p = tmp; 2157 if (*p == '-' && *size > 1) { 2158 *neg = true; 2159 p++; 2160 } else 2161 *neg = false; 2162 if (!isdigit(*p)) 2163 return -EINVAL; 2164 2165 *val = simple_strtoul(p, &p, 0); 2166 2167 len = p - tmp; 2168 2169 /* We don't know if the next char is whitespace thus we may accept 2170 * invalid integers (e.g. 1234...a) or two integers instead of one 2171 * (e.g. 123...1). So lets not allow such large numbers. */ 2172 if (len == TMPBUFLEN - 1) 2173 return -EINVAL; 2174 2175 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2176 return -EINVAL; 2177 2178 if (tr && (len < *size)) 2179 *tr = *p; 2180 2181 *buf += len; 2182 *size -= len; 2183 2184 return 0; 2185 } 2186 2187 /** 2188 * proc_put_long - converts an integer to a decimal ASCII formatted string 2189 * 2190 * @buf: the user buffer 2191 * @size: the size of the user buffer 2192 * @val: the integer to be converted 2193 * @neg: sign of the number, %TRUE for negative 2194 * 2195 * In case of success %0 is returned and @buf and @size are updated with 2196 * the amount of bytes written. 2197 */ 2198 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2199 bool neg) 2200 { 2201 int len; 2202 char tmp[TMPBUFLEN], *p = tmp; 2203 2204 sprintf(p, "%s%lu", neg ? "-" : "", val); 2205 len = strlen(tmp); 2206 if (len > *size) 2207 len = *size; 2208 if (copy_to_user(*buf, tmp, len)) 2209 return -EFAULT; 2210 *size -= len; 2211 *buf += len; 2212 return 0; 2213 } 2214 #undef TMPBUFLEN 2215 2216 static int proc_put_char(void __user **buf, size_t *size, char c) 2217 { 2218 if (*size) { 2219 char __user **buffer = (char __user **)buf; 2220 if (put_user(c, *buffer)) 2221 return -EFAULT; 2222 (*size)--, (*buffer)++; 2223 *buf = *buffer; 2224 } 2225 return 0; 2226 } 2227 2228 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2229 int *valp, 2230 int write, void *data) 2231 { 2232 if (write) { 2233 *valp = *negp ? -*lvalp : *lvalp; 2234 } else { 2235 int val = *valp; 2236 if (val < 0) { 2237 *negp = true; 2238 *lvalp = (unsigned long)-val; 2239 } else { 2240 *negp = false; 2241 *lvalp = (unsigned long)val; 2242 } 2243 } 2244 return 0; 2245 } 2246 2247 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2248 2249 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2250 int write, void __user *buffer, 2251 size_t *lenp, loff_t *ppos, 2252 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2253 int write, void *data), 2254 void *data) 2255 { 2256 int *i, vleft, first = 1, err = 0; 2257 unsigned long page = 0; 2258 size_t left; 2259 char *kbuf; 2260 2261 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2262 *lenp = 0; 2263 return 0; 2264 } 2265 2266 i = (int *) tbl_data; 2267 vleft = table->maxlen / sizeof(*i); 2268 left = *lenp; 2269 2270 if (!conv) 2271 conv = do_proc_dointvec_conv; 2272 2273 if (write) { 2274 if (left > PAGE_SIZE - 1) 2275 left = PAGE_SIZE - 1; 2276 page = __get_free_page(GFP_TEMPORARY); 2277 kbuf = (char *) page; 2278 if (!kbuf) 2279 return -ENOMEM; 2280 if (copy_from_user(kbuf, buffer, left)) { 2281 err = -EFAULT; 2282 goto free; 2283 } 2284 kbuf[left] = 0; 2285 } 2286 2287 for (; left && vleft--; i++, first=0) { 2288 unsigned long lval; 2289 bool neg; 2290 2291 if (write) { 2292 left -= proc_skip_spaces(&kbuf); 2293 2294 if (!left) 2295 break; 2296 err = proc_get_long(&kbuf, &left, &lval, &neg, 2297 proc_wspace_sep, 2298 sizeof(proc_wspace_sep), NULL); 2299 if (err) 2300 break; 2301 if (conv(&neg, &lval, i, 1, data)) { 2302 err = -EINVAL; 2303 break; 2304 } 2305 } else { 2306 if (conv(&neg, &lval, i, 0, data)) { 2307 err = -EINVAL; 2308 break; 2309 } 2310 if (!first) 2311 err = proc_put_char(&buffer, &left, '\t'); 2312 if (err) 2313 break; 2314 err = proc_put_long(&buffer, &left, lval, neg); 2315 if (err) 2316 break; 2317 } 2318 } 2319 2320 if (!write && !first && left && !err) 2321 err = proc_put_char(&buffer, &left, '\n'); 2322 if (write && !err && left) 2323 left -= proc_skip_spaces(&kbuf); 2324 free: 2325 if (write) { 2326 free_page(page); 2327 if (first) 2328 return err ? : -EINVAL; 2329 } 2330 *lenp -= left; 2331 *ppos += *lenp; 2332 return err; 2333 } 2334 2335 static int do_proc_dointvec(struct ctl_table *table, int write, 2336 void __user *buffer, size_t *lenp, loff_t *ppos, 2337 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2338 int write, void *data), 2339 void *data) 2340 { 2341 return __do_proc_dointvec(table->data, table, write, 2342 buffer, lenp, ppos, conv, data); 2343 } 2344 2345 /** 2346 * proc_dointvec - read a vector of integers 2347 * @table: the sysctl table 2348 * @write: %TRUE if this is a write to the sysctl file 2349 * @buffer: the user buffer 2350 * @lenp: the size of the user buffer 2351 * @ppos: file position 2352 * 2353 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2354 * values from/to the user buffer, treated as an ASCII string. 2355 * 2356 * Returns 0 on success. 2357 */ 2358 int proc_dointvec(struct ctl_table *table, int write, 2359 void __user *buffer, size_t *lenp, loff_t *ppos) 2360 { 2361 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2362 NULL,NULL); 2363 } 2364 2365 /* 2366 * Taint values can only be increased 2367 * This means we can safely use a temporary. 2368 */ 2369 static int proc_taint(struct ctl_table *table, int write, 2370 void __user *buffer, size_t *lenp, loff_t *ppos) 2371 { 2372 struct ctl_table t; 2373 unsigned long tmptaint = get_taint(); 2374 int err; 2375 2376 if (write && !capable(CAP_SYS_ADMIN)) 2377 return -EPERM; 2378 2379 t = *table; 2380 t.data = &tmptaint; 2381 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2382 if (err < 0) 2383 return err; 2384 2385 if (write) { 2386 /* 2387 * Poor man's atomic or. Not worth adding a primitive 2388 * to everyone's atomic.h for this 2389 */ 2390 int i; 2391 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2392 if ((tmptaint >> i) & 1) 2393 add_taint(i); 2394 } 2395 } 2396 2397 return err; 2398 } 2399 2400 struct do_proc_dointvec_minmax_conv_param { 2401 int *min; 2402 int *max; 2403 }; 2404 2405 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2406 int *valp, 2407 int write, void *data) 2408 { 2409 struct do_proc_dointvec_minmax_conv_param *param = data; 2410 if (write) { 2411 int val = *negp ? -*lvalp : *lvalp; 2412 if ((param->min && *param->min > val) || 2413 (param->max && *param->max < val)) 2414 return -EINVAL; 2415 *valp = val; 2416 } else { 2417 int val = *valp; 2418 if (val < 0) { 2419 *negp = true; 2420 *lvalp = (unsigned long)-val; 2421 } else { 2422 *negp = false; 2423 *lvalp = (unsigned long)val; 2424 } 2425 } 2426 return 0; 2427 } 2428 2429 /** 2430 * proc_dointvec_minmax - read a vector of integers with min/max values 2431 * @table: the sysctl table 2432 * @write: %TRUE if this is a write to the sysctl file 2433 * @buffer: the user buffer 2434 * @lenp: the size of the user buffer 2435 * @ppos: file position 2436 * 2437 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2438 * values from/to the user buffer, treated as an ASCII string. 2439 * 2440 * This routine will ensure the values are within the range specified by 2441 * table->extra1 (min) and table->extra2 (max). 2442 * 2443 * Returns 0 on success. 2444 */ 2445 int proc_dointvec_minmax(struct ctl_table *table, int write, 2446 void __user *buffer, size_t *lenp, loff_t *ppos) 2447 { 2448 struct do_proc_dointvec_minmax_conv_param param = { 2449 .min = (int *) table->extra1, 2450 .max = (int *) table->extra2, 2451 }; 2452 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2453 do_proc_dointvec_minmax_conv, ¶m); 2454 } 2455 2456 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2457 void __user *buffer, 2458 size_t *lenp, loff_t *ppos, 2459 unsigned long convmul, 2460 unsigned long convdiv) 2461 { 2462 unsigned long *i, *min, *max; 2463 int vleft, first = 1, err = 0; 2464 unsigned long page = 0; 2465 size_t left; 2466 char *kbuf; 2467 2468 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2469 *lenp = 0; 2470 return 0; 2471 } 2472 2473 i = (unsigned long *) data; 2474 min = (unsigned long *) table->extra1; 2475 max = (unsigned long *) table->extra2; 2476 vleft = table->maxlen / sizeof(unsigned long); 2477 left = *lenp; 2478 2479 if (write) { 2480 if (left > PAGE_SIZE - 1) 2481 left = PAGE_SIZE - 1; 2482 page = __get_free_page(GFP_TEMPORARY); 2483 kbuf = (char *) page; 2484 if (!kbuf) 2485 return -ENOMEM; 2486 if (copy_from_user(kbuf, buffer, left)) { 2487 err = -EFAULT; 2488 goto free; 2489 } 2490 kbuf[left] = 0; 2491 } 2492 2493 for (; left && vleft--; i++, first = 0) { 2494 unsigned long val; 2495 2496 if (write) { 2497 bool neg; 2498 2499 left -= proc_skip_spaces(&kbuf); 2500 2501 err = proc_get_long(&kbuf, &left, &val, &neg, 2502 proc_wspace_sep, 2503 sizeof(proc_wspace_sep), NULL); 2504 if (err) 2505 break; 2506 if (neg) 2507 continue; 2508 if ((min && val < *min) || (max && val > *max)) 2509 continue; 2510 *i = val; 2511 } else { 2512 val = convdiv * (*i) / convmul; 2513 if (!first) 2514 err = proc_put_char(&buffer, &left, '\t'); 2515 err = proc_put_long(&buffer, &left, val, false); 2516 if (err) 2517 break; 2518 } 2519 } 2520 2521 if (!write && !first && left && !err) 2522 err = proc_put_char(&buffer, &left, '\n'); 2523 if (write && !err) 2524 left -= proc_skip_spaces(&kbuf); 2525 free: 2526 if (write) { 2527 free_page(page); 2528 if (first) 2529 return err ? : -EINVAL; 2530 } 2531 *lenp -= left; 2532 *ppos += *lenp; 2533 return err; 2534 } 2535 2536 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2537 void __user *buffer, 2538 size_t *lenp, loff_t *ppos, 2539 unsigned long convmul, 2540 unsigned long convdiv) 2541 { 2542 return __do_proc_doulongvec_minmax(table->data, table, write, 2543 buffer, lenp, ppos, convmul, convdiv); 2544 } 2545 2546 /** 2547 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2548 * @table: the sysctl table 2549 * @write: %TRUE if this is a write to the sysctl file 2550 * @buffer: the user buffer 2551 * @lenp: the size of the user buffer 2552 * @ppos: file position 2553 * 2554 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2555 * values from/to the user buffer, treated as an ASCII string. 2556 * 2557 * This routine will ensure the values are within the range specified by 2558 * table->extra1 (min) and table->extra2 (max). 2559 * 2560 * Returns 0 on success. 2561 */ 2562 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2563 void __user *buffer, size_t *lenp, loff_t *ppos) 2564 { 2565 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2566 } 2567 2568 /** 2569 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2570 * @table: the sysctl table 2571 * @write: %TRUE if this is a write to the sysctl file 2572 * @buffer: the user buffer 2573 * @lenp: the size of the user buffer 2574 * @ppos: file position 2575 * 2576 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2577 * values from/to the user buffer, treated as an ASCII string. The values 2578 * are treated as milliseconds, and converted to jiffies when they are stored. 2579 * 2580 * This routine will ensure the values are within the range specified by 2581 * table->extra1 (min) and table->extra2 (max). 2582 * 2583 * Returns 0 on success. 2584 */ 2585 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2586 void __user *buffer, 2587 size_t *lenp, loff_t *ppos) 2588 { 2589 return do_proc_doulongvec_minmax(table, write, buffer, 2590 lenp, ppos, HZ, 1000l); 2591 } 2592 2593 2594 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2595 int *valp, 2596 int write, void *data) 2597 { 2598 if (write) { 2599 if (*lvalp > LONG_MAX / HZ) 2600 return 1; 2601 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2602 } else { 2603 int val = *valp; 2604 unsigned long lval; 2605 if (val < 0) { 2606 *negp = true; 2607 lval = (unsigned long)-val; 2608 } else { 2609 *negp = false; 2610 lval = (unsigned long)val; 2611 } 2612 *lvalp = lval / HZ; 2613 } 2614 return 0; 2615 } 2616 2617 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2618 int *valp, 2619 int write, void *data) 2620 { 2621 if (write) { 2622 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2623 return 1; 2624 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2625 } else { 2626 int val = *valp; 2627 unsigned long lval; 2628 if (val < 0) { 2629 *negp = true; 2630 lval = (unsigned long)-val; 2631 } else { 2632 *negp = false; 2633 lval = (unsigned long)val; 2634 } 2635 *lvalp = jiffies_to_clock_t(lval); 2636 } 2637 return 0; 2638 } 2639 2640 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2641 int *valp, 2642 int write, void *data) 2643 { 2644 if (write) { 2645 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2646 } else { 2647 int val = *valp; 2648 unsigned long lval; 2649 if (val < 0) { 2650 *negp = true; 2651 lval = (unsigned long)-val; 2652 } else { 2653 *negp = false; 2654 lval = (unsigned long)val; 2655 } 2656 *lvalp = jiffies_to_msecs(lval); 2657 } 2658 return 0; 2659 } 2660 2661 /** 2662 * proc_dointvec_jiffies - read a vector of integers as seconds 2663 * @table: the sysctl table 2664 * @write: %TRUE if this is a write to the sysctl file 2665 * @buffer: the user buffer 2666 * @lenp: the size of the user buffer 2667 * @ppos: file position 2668 * 2669 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2670 * values from/to the user buffer, treated as an ASCII string. 2671 * The values read are assumed to be in seconds, and are converted into 2672 * jiffies. 2673 * 2674 * Returns 0 on success. 2675 */ 2676 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2677 void __user *buffer, size_t *lenp, loff_t *ppos) 2678 { 2679 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2680 do_proc_dointvec_jiffies_conv,NULL); 2681 } 2682 2683 /** 2684 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2685 * @table: the sysctl table 2686 * @write: %TRUE if this is a write to the sysctl file 2687 * @buffer: the user buffer 2688 * @lenp: the size of the user buffer 2689 * @ppos: pointer to the file position 2690 * 2691 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2692 * values from/to the user buffer, treated as an ASCII string. 2693 * The values read are assumed to be in 1/USER_HZ seconds, and 2694 * are converted into jiffies. 2695 * 2696 * Returns 0 on success. 2697 */ 2698 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2699 void __user *buffer, size_t *lenp, loff_t *ppos) 2700 { 2701 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2702 do_proc_dointvec_userhz_jiffies_conv,NULL); 2703 } 2704 2705 /** 2706 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2707 * @table: the sysctl table 2708 * @write: %TRUE if this is a write to the sysctl file 2709 * @buffer: the user buffer 2710 * @lenp: the size of the user buffer 2711 * @ppos: file position 2712 * @ppos: the current position in the file 2713 * 2714 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2715 * values from/to the user buffer, treated as an ASCII string. 2716 * The values read are assumed to be in 1/1000 seconds, and 2717 * are converted into jiffies. 2718 * 2719 * Returns 0 on success. 2720 */ 2721 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2722 void __user *buffer, size_t *lenp, loff_t *ppos) 2723 { 2724 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2725 do_proc_dointvec_ms_jiffies_conv, NULL); 2726 } 2727 2728 static int proc_do_cad_pid(struct ctl_table *table, int write, 2729 void __user *buffer, size_t *lenp, loff_t *ppos) 2730 { 2731 struct pid *new_pid; 2732 pid_t tmp; 2733 int r; 2734 2735 tmp = pid_vnr(cad_pid); 2736 2737 r = __do_proc_dointvec(&tmp, table, write, buffer, 2738 lenp, ppos, NULL, NULL); 2739 if (r || !write) 2740 return r; 2741 2742 new_pid = find_get_pid(tmp); 2743 if (!new_pid) 2744 return -ESRCH; 2745 2746 put_pid(xchg(&cad_pid, new_pid)); 2747 return 0; 2748 } 2749 2750 /** 2751 * proc_do_large_bitmap - read/write from/to a large bitmap 2752 * @table: the sysctl table 2753 * @write: %TRUE if this is a write to the sysctl file 2754 * @buffer: the user buffer 2755 * @lenp: the size of the user buffer 2756 * @ppos: file position 2757 * 2758 * The bitmap is stored at table->data and the bitmap length (in bits) 2759 * in table->maxlen. 2760 * 2761 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2762 * large bitmaps may be represented in a compact manner. Writing into 2763 * the file will clear the bitmap then update it with the given input. 2764 * 2765 * Returns 0 on success. 2766 */ 2767 int proc_do_large_bitmap(struct ctl_table *table, int write, 2768 void __user *buffer, size_t *lenp, loff_t *ppos) 2769 { 2770 int err = 0; 2771 bool first = 1; 2772 size_t left = *lenp; 2773 unsigned long bitmap_len = table->maxlen; 2774 unsigned long *bitmap = (unsigned long *) table->data; 2775 unsigned long *tmp_bitmap = NULL; 2776 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2777 2778 if (!bitmap_len || !left || (*ppos && !write)) { 2779 *lenp = 0; 2780 return 0; 2781 } 2782 2783 if (write) { 2784 unsigned long page = 0; 2785 char *kbuf; 2786 2787 if (left > PAGE_SIZE - 1) 2788 left = PAGE_SIZE - 1; 2789 2790 page = __get_free_page(GFP_TEMPORARY); 2791 kbuf = (char *) page; 2792 if (!kbuf) 2793 return -ENOMEM; 2794 if (copy_from_user(kbuf, buffer, left)) { 2795 free_page(page); 2796 return -EFAULT; 2797 } 2798 kbuf[left] = 0; 2799 2800 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2801 GFP_KERNEL); 2802 if (!tmp_bitmap) { 2803 free_page(page); 2804 return -ENOMEM; 2805 } 2806 proc_skip_char(&kbuf, &left, '\n'); 2807 while (!err && left) { 2808 unsigned long val_a, val_b; 2809 bool neg; 2810 2811 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2812 sizeof(tr_a), &c); 2813 if (err) 2814 break; 2815 if (val_a >= bitmap_len || neg) { 2816 err = -EINVAL; 2817 break; 2818 } 2819 2820 val_b = val_a; 2821 if (left) { 2822 kbuf++; 2823 left--; 2824 } 2825 2826 if (c == '-') { 2827 err = proc_get_long(&kbuf, &left, &val_b, 2828 &neg, tr_b, sizeof(tr_b), 2829 &c); 2830 if (err) 2831 break; 2832 if (val_b >= bitmap_len || neg || 2833 val_a > val_b) { 2834 err = -EINVAL; 2835 break; 2836 } 2837 if (left) { 2838 kbuf++; 2839 left--; 2840 } 2841 } 2842 2843 while (val_a <= val_b) 2844 set_bit(val_a++, tmp_bitmap); 2845 2846 first = 0; 2847 proc_skip_char(&kbuf, &left, '\n'); 2848 } 2849 free_page(page); 2850 } else { 2851 unsigned long bit_a, bit_b = 0; 2852 2853 while (left) { 2854 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2855 if (bit_a >= bitmap_len) 2856 break; 2857 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2858 bit_a + 1) - 1; 2859 2860 if (!first) { 2861 err = proc_put_char(&buffer, &left, ','); 2862 if (err) 2863 break; 2864 } 2865 err = proc_put_long(&buffer, &left, bit_a, false); 2866 if (err) 2867 break; 2868 if (bit_a != bit_b) { 2869 err = proc_put_char(&buffer, &left, '-'); 2870 if (err) 2871 break; 2872 err = proc_put_long(&buffer, &left, bit_b, false); 2873 if (err) 2874 break; 2875 } 2876 2877 first = 0; bit_b++; 2878 } 2879 if (!err) 2880 err = proc_put_char(&buffer, &left, '\n'); 2881 } 2882 2883 if (!err) { 2884 if (write) { 2885 if (*ppos) 2886 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2887 else 2888 memcpy(bitmap, tmp_bitmap, 2889 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2890 } 2891 kfree(tmp_bitmap); 2892 *lenp -= left; 2893 *ppos += *lenp; 2894 return 0; 2895 } else { 2896 kfree(tmp_bitmap); 2897 return err; 2898 } 2899 } 2900 2901 #else /* CONFIG_PROC_SYSCTL */ 2902 2903 int proc_dostring(struct ctl_table *table, int write, 2904 void __user *buffer, size_t *lenp, loff_t *ppos) 2905 { 2906 return -ENOSYS; 2907 } 2908 2909 int proc_dointvec(struct ctl_table *table, int write, 2910 void __user *buffer, size_t *lenp, loff_t *ppos) 2911 { 2912 return -ENOSYS; 2913 } 2914 2915 int proc_dointvec_minmax(struct ctl_table *table, int write, 2916 void __user *buffer, size_t *lenp, loff_t *ppos) 2917 { 2918 return -ENOSYS; 2919 } 2920 2921 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2922 void __user *buffer, size_t *lenp, loff_t *ppos) 2923 { 2924 return -ENOSYS; 2925 } 2926 2927 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2928 void __user *buffer, size_t *lenp, loff_t *ppos) 2929 { 2930 return -ENOSYS; 2931 } 2932 2933 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2934 void __user *buffer, size_t *lenp, loff_t *ppos) 2935 { 2936 return -ENOSYS; 2937 } 2938 2939 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2940 void __user *buffer, size_t *lenp, loff_t *ppos) 2941 { 2942 return -ENOSYS; 2943 } 2944 2945 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2946 void __user *buffer, 2947 size_t *lenp, loff_t *ppos) 2948 { 2949 return -ENOSYS; 2950 } 2951 2952 2953 #endif /* CONFIG_PROC_SYSCTL */ 2954 2955 /* 2956 * No sense putting this after each symbol definition, twice, 2957 * exception granted :-) 2958 */ 2959 EXPORT_SYMBOL(proc_dointvec); 2960 EXPORT_SYMBOL(proc_dointvec_jiffies); 2961 EXPORT_SYMBOL(proc_dointvec_minmax); 2962 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2963 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2964 EXPORT_SYMBOL(proc_dostring); 2965 EXPORT_SYMBOL(proc_doulongvec_minmax); 2966 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2967 EXPORT_SYMBOL(register_sysctl_table); 2968 EXPORT_SYMBOL(register_sysctl_paths); 2969 EXPORT_SYMBOL(unregister_sysctl_table); 2970