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