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