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 int __maybe_unused three = 3; 121 static unsigned long one_ul = 1; 122 static int one_hundred = 100; 123 #ifdef CONFIG_PRINTK 124 static int ten_thousand = 10000; 125 #endif 126 127 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 128 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 129 130 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 131 static int maxolduid = 65535; 132 static int minolduid; 133 static int min_percpu_pagelist_fract = 8; 134 135 static int ngroups_max = NGROUPS_MAX; 136 137 #ifdef CONFIG_INOTIFY_USER 138 #include <linux/inotify.h> 139 #endif 140 #ifdef CONFIG_SPARC 141 #include <asm/system.h> 142 #endif 143 144 #ifdef CONFIG_SPARC64 145 extern int sysctl_tsb_ratio; 146 #endif 147 148 #ifdef __hppa__ 149 extern int pwrsw_enabled; 150 extern int unaligned_enabled; 151 #endif 152 153 #ifdef CONFIG_S390 154 #ifdef CONFIG_MATHEMU 155 extern int sysctl_ieee_emulation_warnings; 156 #endif 157 extern int sysctl_userprocess_debug; 158 extern int spin_retry; 159 #endif 160 161 #ifdef CONFIG_IA64 162 extern int no_unaligned_warning; 163 extern int unaligned_dump_stack; 164 #endif 165 166 #ifdef CONFIG_PROC_SYSCTL 167 static int proc_do_cad_pid(struct ctl_table *table, int write, 168 void __user *buffer, size_t *lenp, loff_t *ppos); 169 static int proc_taint(struct ctl_table *table, int write, 170 void __user *buffer, size_t *lenp, loff_t *ppos); 171 #endif 172 173 #ifdef CONFIG_PRINTK 174 static int proc_dmesg_restrict(struct ctl_table *table, int write, 175 void __user *buffer, size_t *lenp, loff_t *ppos); 176 #endif 177 178 #ifdef CONFIG_MAGIC_SYSRQ 179 /* Note: sysrq code uses it's own private copy */ 180 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 181 182 static int sysrq_sysctl_handler(ctl_table *table, int write, 183 void __user *buffer, size_t *lenp, 184 loff_t *ppos) 185 { 186 int error; 187 188 error = proc_dointvec(table, write, buffer, lenp, ppos); 189 if (error) 190 return error; 191 192 if (write) 193 sysrq_toggle_support(__sysrq_enabled); 194 195 return 0; 196 } 197 198 #endif 199 200 static struct ctl_table root_table[]; 201 static struct ctl_table_root sysctl_table_root; 202 static struct ctl_table_header root_table_header = { 203 {{.count = 1, 204 .ctl_table = root_table, 205 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, 206 .root = &sysctl_table_root, 207 .set = &sysctl_table_root.default_set, 208 }; 209 static struct ctl_table_root sysctl_table_root = { 210 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 211 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 212 }; 213 214 static struct ctl_table kern_table[]; 215 static struct ctl_table vm_table[]; 216 static struct ctl_table fs_table[]; 217 static struct ctl_table debug_table[]; 218 static struct ctl_table dev_table[]; 219 extern struct ctl_table random_table[]; 220 #ifdef CONFIG_EPOLL 221 extern struct ctl_table epoll_table[]; 222 #endif 223 224 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 225 int sysctl_legacy_va_layout; 226 #endif 227 228 /* The default sysctl tables: */ 229 230 static struct ctl_table root_table[] = { 231 { 232 .procname = "kernel", 233 .mode = 0555, 234 .child = kern_table, 235 }, 236 { 237 .procname = "vm", 238 .mode = 0555, 239 .child = vm_table, 240 }, 241 { 242 .procname = "fs", 243 .mode = 0555, 244 .child = fs_table, 245 }, 246 { 247 .procname = "debug", 248 .mode = 0555, 249 .child = debug_table, 250 }, 251 { 252 .procname = "dev", 253 .mode = 0555, 254 .child = dev_table, 255 }, 256 { } 257 }; 258 259 #ifdef CONFIG_SCHED_DEBUG 260 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 261 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 262 static int min_wakeup_granularity_ns; /* 0 usecs */ 263 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 264 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 265 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 266 #endif 267 268 #ifdef CONFIG_COMPACTION 269 static int min_extfrag_threshold; 270 static int max_extfrag_threshold = 1000; 271 #endif 272 273 static struct ctl_table kern_table[] = { 274 { 275 .procname = "sched_child_runs_first", 276 .data = &sysctl_sched_child_runs_first, 277 .maxlen = sizeof(unsigned int), 278 .mode = 0644, 279 .proc_handler = proc_dointvec, 280 }, 281 #ifdef CONFIG_SCHED_DEBUG 282 { 283 .procname = "sched_min_granularity_ns", 284 .data = &sysctl_sched_min_granularity, 285 .maxlen = sizeof(unsigned int), 286 .mode = 0644, 287 .proc_handler = sched_proc_update_handler, 288 .extra1 = &min_sched_granularity_ns, 289 .extra2 = &max_sched_granularity_ns, 290 }, 291 { 292 .procname = "sched_latency_ns", 293 .data = &sysctl_sched_latency, 294 .maxlen = sizeof(unsigned int), 295 .mode = 0644, 296 .proc_handler = sched_proc_update_handler, 297 .extra1 = &min_sched_granularity_ns, 298 .extra2 = &max_sched_granularity_ns, 299 }, 300 { 301 .procname = "sched_wakeup_granularity_ns", 302 .data = &sysctl_sched_wakeup_granularity, 303 .maxlen = sizeof(unsigned int), 304 .mode = 0644, 305 .proc_handler = sched_proc_update_handler, 306 .extra1 = &min_wakeup_granularity_ns, 307 .extra2 = &max_wakeup_granularity_ns, 308 }, 309 { 310 .procname = "sched_tunable_scaling", 311 .data = &sysctl_sched_tunable_scaling, 312 .maxlen = sizeof(enum sched_tunable_scaling), 313 .mode = 0644, 314 .proc_handler = sched_proc_update_handler, 315 .extra1 = &min_sched_tunable_scaling, 316 .extra2 = &max_sched_tunable_scaling, 317 }, 318 { 319 .procname = "sched_migration_cost", 320 .data = &sysctl_sched_migration_cost, 321 .maxlen = sizeof(unsigned int), 322 .mode = 0644, 323 .proc_handler = proc_dointvec, 324 }, 325 { 326 .procname = "sched_nr_migrate", 327 .data = &sysctl_sched_nr_migrate, 328 .maxlen = sizeof(unsigned int), 329 .mode = 0644, 330 .proc_handler = proc_dointvec, 331 }, 332 { 333 .procname = "sched_time_avg", 334 .data = &sysctl_sched_time_avg, 335 .maxlen = sizeof(unsigned int), 336 .mode = 0644, 337 .proc_handler = proc_dointvec, 338 }, 339 { 340 .procname = "sched_shares_window", 341 .data = &sysctl_sched_shares_window, 342 .maxlen = sizeof(unsigned int), 343 .mode = 0644, 344 .proc_handler = proc_dointvec, 345 }, 346 { 347 .procname = "timer_migration", 348 .data = &sysctl_timer_migration, 349 .maxlen = sizeof(unsigned int), 350 .mode = 0644, 351 .proc_handler = proc_dointvec_minmax, 352 .extra1 = &zero, 353 .extra2 = &one, 354 }, 355 #endif 356 { 357 .procname = "sched_rt_period_us", 358 .data = &sysctl_sched_rt_period, 359 .maxlen = sizeof(unsigned int), 360 .mode = 0644, 361 .proc_handler = sched_rt_handler, 362 }, 363 { 364 .procname = "sched_rt_runtime_us", 365 .data = &sysctl_sched_rt_runtime, 366 .maxlen = sizeof(int), 367 .mode = 0644, 368 .proc_handler = sched_rt_handler, 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_minmax, 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_dmesg_restrict, 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 = perf_proc_update_handler, 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_minmax, 981 .extra1 = &zero, 982 .extra2 = &two, 983 }, 984 { 985 .procname = "panic_on_oom", 986 .data = &sysctl_panic_on_oom, 987 .maxlen = sizeof(sysctl_panic_on_oom), 988 .mode = 0644, 989 .proc_handler = proc_dointvec_minmax, 990 .extra1 = &zero, 991 .extra2 = &two, 992 }, 993 { 994 .procname = "oom_kill_allocating_task", 995 .data = &sysctl_oom_kill_allocating_task, 996 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 997 .mode = 0644, 998 .proc_handler = proc_dointvec, 999 }, 1000 { 1001 .procname = "oom_dump_tasks", 1002 .data = &sysctl_oom_dump_tasks, 1003 .maxlen = sizeof(sysctl_oom_dump_tasks), 1004 .mode = 0644, 1005 .proc_handler = proc_dointvec, 1006 }, 1007 { 1008 .procname = "overcommit_ratio", 1009 .data = &sysctl_overcommit_ratio, 1010 .maxlen = sizeof(sysctl_overcommit_ratio), 1011 .mode = 0644, 1012 .proc_handler = proc_dointvec, 1013 }, 1014 { 1015 .procname = "page-cluster", 1016 .data = &page_cluster, 1017 .maxlen = sizeof(int), 1018 .mode = 0644, 1019 .proc_handler = proc_dointvec_minmax, 1020 .extra1 = &zero, 1021 }, 1022 { 1023 .procname = "dirty_background_ratio", 1024 .data = &dirty_background_ratio, 1025 .maxlen = sizeof(dirty_background_ratio), 1026 .mode = 0644, 1027 .proc_handler = dirty_background_ratio_handler, 1028 .extra1 = &zero, 1029 .extra2 = &one_hundred, 1030 }, 1031 { 1032 .procname = "dirty_background_bytes", 1033 .data = &dirty_background_bytes, 1034 .maxlen = sizeof(dirty_background_bytes), 1035 .mode = 0644, 1036 .proc_handler = dirty_background_bytes_handler, 1037 .extra1 = &one_ul, 1038 }, 1039 { 1040 .procname = "dirty_ratio", 1041 .data = &vm_dirty_ratio, 1042 .maxlen = sizeof(vm_dirty_ratio), 1043 .mode = 0644, 1044 .proc_handler = dirty_ratio_handler, 1045 .extra1 = &zero, 1046 .extra2 = &one_hundred, 1047 }, 1048 { 1049 .procname = "dirty_bytes", 1050 .data = &vm_dirty_bytes, 1051 .maxlen = sizeof(vm_dirty_bytes), 1052 .mode = 0644, 1053 .proc_handler = dirty_bytes_handler, 1054 .extra1 = &dirty_bytes_min, 1055 }, 1056 { 1057 .procname = "dirty_writeback_centisecs", 1058 .data = &dirty_writeback_interval, 1059 .maxlen = sizeof(dirty_writeback_interval), 1060 .mode = 0644, 1061 .proc_handler = dirty_writeback_centisecs_handler, 1062 }, 1063 { 1064 .procname = "dirty_expire_centisecs", 1065 .data = &dirty_expire_interval, 1066 .maxlen = sizeof(dirty_expire_interval), 1067 .mode = 0644, 1068 .proc_handler = proc_dointvec_minmax, 1069 .extra1 = &zero, 1070 }, 1071 { 1072 .procname = "nr_pdflush_threads", 1073 .data = &nr_pdflush_threads, 1074 .maxlen = sizeof nr_pdflush_threads, 1075 .mode = 0444 /* read-only*/, 1076 .proc_handler = proc_dointvec, 1077 }, 1078 { 1079 .procname = "swappiness", 1080 .data = &vm_swappiness, 1081 .maxlen = sizeof(vm_swappiness), 1082 .mode = 0644, 1083 .proc_handler = proc_dointvec_minmax, 1084 .extra1 = &zero, 1085 .extra2 = &one_hundred, 1086 }, 1087 #ifdef CONFIG_HUGETLB_PAGE 1088 { 1089 .procname = "nr_hugepages", 1090 .data = NULL, 1091 .maxlen = sizeof(unsigned long), 1092 .mode = 0644, 1093 .proc_handler = hugetlb_sysctl_handler, 1094 .extra1 = (void *)&hugetlb_zero, 1095 .extra2 = (void *)&hugetlb_infinity, 1096 }, 1097 #ifdef CONFIG_NUMA 1098 { 1099 .procname = "nr_hugepages_mempolicy", 1100 .data = NULL, 1101 .maxlen = sizeof(unsigned long), 1102 .mode = 0644, 1103 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1104 .extra1 = (void *)&hugetlb_zero, 1105 .extra2 = (void *)&hugetlb_infinity, 1106 }, 1107 #endif 1108 { 1109 .procname = "hugetlb_shm_group", 1110 .data = &sysctl_hugetlb_shm_group, 1111 .maxlen = sizeof(gid_t), 1112 .mode = 0644, 1113 .proc_handler = proc_dointvec, 1114 }, 1115 { 1116 .procname = "hugepages_treat_as_movable", 1117 .data = &hugepages_treat_as_movable, 1118 .maxlen = sizeof(int), 1119 .mode = 0644, 1120 .proc_handler = hugetlb_treat_movable_handler, 1121 }, 1122 { 1123 .procname = "nr_overcommit_hugepages", 1124 .data = NULL, 1125 .maxlen = sizeof(unsigned long), 1126 .mode = 0644, 1127 .proc_handler = hugetlb_overcommit_handler, 1128 .extra1 = (void *)&hugetlb_zero, 1129 .extra2 = (void *)&hugetlb_infinity, 1130 }, 1131 #endif 1132 { 1133 .procname = "lowmem_reserve_ratio", 1134 .data = &sysctl_lowmem_reserve_ratio, 1135 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1136 .mode = 0644, 1137 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1138 }, 1139 { 1140 .procname = "drop_caches", 1141 .data = &sysctl_drop_caches, 1142 .maxlen = sizeof(int), 1143 .mode = 0644, 1144 .proc_handler = drop_caches_sysctl_handler, 1145 .extra1 = &one, 1146 .extra2 = &three, 1147 }, 1148 #ifdef CONFIG_COMPACTION 1149 { 1150 .procname = "compact_memory", 1151 .data = &sysctl_compact_memory, 1152 .maxlen = sizeof(int), 1153 .mode = 0200, 1154 .proc_handler = sysctl_compaction_handler, 1155 }, 1156 { 1157 .procname = "extfrag_threshold", 1158 .data = &sysctl_extfrag_threshold, 1159 .maxlen = sizeof(int), 1160 .mode = 0644, 1161 .proc_handler = sysctl_extfrag_handler, 1162 .extra1 = &min_extfrag_threshold, 1163 .extra2 = &max_extfrag_threshold, 1164 }, 1165 1166 #endif /* CONFIG_COMPACTION */ 1167 { 1168 .procname = "min_free_kbytes", 1169 .data = &min_free_kbytes, 1170 .maxlen = sizeof(min_free_kbytes), 1171 .mode = 0644, 1172 .proc_handler = min_free_kbytes_sysctl_handler, 1173 .extra1 = &zero, 1174 }, 1175 { 1176 .procname = "percpu_pagelist_fraction", 1177 .data = &percpu_pagelist_fraction, 1178 .maxlen = sizeof(percpu_pagelist_fraction), 1179 .mode = 0644, 1180 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1181 .extra1 = &min_percpu_pagelist_fract, 1182 }, 1183 #ifdef CONFIG_MMU 1184 { 1185 .procname = "max_map_count", 1186 .data = &sysctl_max_map_count, 1187 .maxlen = sizeof(sysctl_max_map_count), 1188 .mode = 0644, 1189 .proc_handler = proc_dointvec_minmax, 1190 .extra1 = &zero, 1191 }, 1192 #else 1193 { 1194 .procname = "nr_trim_pages", 1195 .data = &sysctl_nr_trim_pages, 1196 .maxlen = sizeof(sysctl_nr_trim_pages), 1197 .mode = 0644, 1198 .proc_handler = proc_dointvec_minmax, 1199 .extra1 = &zero, 1200 }, 1201 #endif 1202 { 1203 .procname = "laptop_mode", 1204 .data = &laptop_mode, 1205 .maxlen = sizeof(laptop_mode), 1206 .mode = 0644, 1207 .proc_handler = proc_dointvec_jiffies, 1208 }, 1209 { 1210 .procname = "block_dump", 1211 .data = &block_dump, 1212 .maxlen = sizeof(block_dump), 1213 .mode = 0644, 1214 .proc_handler = proc_dointvec, 1215 .extra1 = &zero, 1216 }, 1217 { 1218 .procname = "vfs_cache_pressure", 1219 .data = &sysctl_vfs_cache_pressure, 1220 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1221 .mode = 0644, 1222 .proc_handler = proc_dointvec, 1223 .extra1 = &zero, 1224 }, 1225 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1226 { 1227 .procname = "legacy_va_layout", 1228 .data = &sysctl_legacy_va_layout, 1229 .maxlen = sizeof(sysctl_legacy_va_layout), 1230 .mode = 0644, 1231 .proc_handler = proc_dointvec, 1232 .extra1 = &zero, 1233 }, 1234 #endif 1235 #ifdef CONFIG_NUMA 1236 { 1237 .procname = "zone_reclaim_mode", 1238 .data = &zone_reclaim_mode, 1239 .maxlen = sizeof(zone_reclaim_mode), 1240 .mode = 0644, 1241 .proc_handler = proc_dointvec, 1242 .extra1 = &zero, 1243 }, 1244 { 1245 .procname = "min_unmapped_ratio", 1246 .data = &sysctl_min_unmapped_ratio, 1247 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1248 .mode = 0644, 1249 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1250 .extra1 = &zero, 1251 .extra2 = &one_hundred, 1252 }, 1253 { 1254 .procname = "min_slab_ratio", 1255 .data = &sysctl_min_slab_ratio, 1256 .maxlen = sizeof(sysctl_min_slab_ratio), 1257 .mode = 0644, 1258 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1259 .extra1 = &zero, 1260 .extra2 = &one_hundred, 1261 }, 1262 #endif 1263 #ifdef CONFIG_SMP 1264 { 1265 .procname = "stat_interval", 1266 .data = &sysctl_stat_interval, 1267 .maxlen = sizeof(sysctl_stat_interval), 1268 .mode = 0644, 1269 .proc_handler = proc_dointvec_jiffies, 1270 }, 1271 #endif 1272 #ifdef CONFIG_MMU 1273 { 1274 .procname = "mmap_min_addr", 1275 .data = &dac_mmap_min_addr, 1276 .maxlen = sizeof(unsigned long), 1277 .mode = 0644, 1278 .proc_handler = mmap_min_addr_handler, 1279 }, 1280 #endif 1281 #ifdef CONFIG_NUMA 1282 { 1283 .procname = "numa_zonelist_order", 1284 .data = &numa_zonelist_order, 1285 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1286 .mode = 0644, 1287 .proc_handler = numa_zonelist_order_handler, 1288 }, 1289 #endif 1290 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1291 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1292 { 1293 .procname = "vdso_enabled", 1294 .data = &vdso_enabled, 1295 .maxlen = sizeof(vdso_enabled), 1296 .mode = 0644, 1297 .proc_handler = proc_dointvec, 1298 .extra1 = &zero, 1299 }, 1300 #endif 1301 #ifdef CONFIG_HIGHMEM 1302 { 1303 .procname = "highmem_is_dirtyable", 1304 .data = &vm_highmem_is_dirtyable, 1305 .maxlen = sizeof(vm_highmem_is_dirtyable), 1306 .mode = 0644, 1307 .proc_handler = proc_dointvec_minmax, 1308 .extra1 = &zero, 1309 .extra2 = &one, 1310 }, 1311 #endif 1312 { 1313 .procname = "scan_unevictable_pages", 1314 .data = &scan_unevictable_pages, 1315 .maxlen = sizeof(scan_unevictable_pages), 1316 .mode = 0644, 1317 .proc_handler = scan_unevictable_handler, 1318 }, 1319 #ifdef CONFIG_MEMORY_FAILURE 1320 { 1321 .procname = "memory_failure_early_kill", 1322 .data = &sysctl_memory_failure_early_kill, 1323 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1324 .mode = 0644, 1325 .proc_handler = proc_dointvec_minmax, 1326 .extra1 = &zero, 1327 .extra2 = &one, 1328 }, 1329 { 1330 .procname = "memory_failure_recovery", 1331 .data = &sysctl_memory_failure_recovery, 1332 .maxlen = sizeof(sysctl_memory_failure_recovery), 1333 .mode = 0644, 1334 .proc_handler = proc_dointvec_minmax, 1335 .extra1 = &zero, 1336 .extra2 = &one, 1337 }, 1338 #endif 1339 { } 1340 }; 1341 1342 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1343 static struct ctl_table binfmt_misc_table[] = { 1344 { } 1345 }; 1346 #endif 1347 1348 static struct ctl_table fs_table[] = { 1349 { 1350 .procname = "inode-nr", 1351 .data = &inodes_stat, 1352 .maxlen = 2*sizeof(int), 1353 .mode = 0444, 1354 .proc_handler = proc_nr_inodes, 1355 }, 1356 { 1357 .procname = "inode-state", 1358 .data = &inodes_stat, 1359 .maxlen = 7*sizeof(int), 1360 .mode = 0444, 1361 .proc_handler = proc_nr_inodes, 1362 }, 1363 { 1364 .procname = "file-nr", 1365 .data = &files_stat, 1366 .maxlen = sizeof(files_stat), 1367 .mode = 0444, 1368 .proc_handler = proc_nr_files, 1369 }, 1370 { 1371 .procname = "file-max", 1372 .data = &files_stat.max_files, 1373 .maxlen = sizeof(files_stat.max_files), 1374 .mode = 0644, 1375 .proc_handler = proc_doulongvec_minmax, 1376 }, 1377 { 1378 .procname = "nr_open", 1379 .data = &sysctl_nr_open, 1380 .maxlen = sizeof(int), 1381 .mode = 0644, 1382 .proc_handler = proc_dointvec_minmax, 1383 .extra1 = &sysctl_nr_open_min, 1384 .extra2 = &sysctl_nr_open_max, 1385 }, 1386 { 1387 .procname = "dentry-state", 1388 .data = &dentry_stat, 1389 .maxlen = 6*sizeof(int), 1390 .mode = 0444, 1391 .proc_handler = proc_nr_dentry, 1392 }, 1393 { 1394 .procname = "overflowuid", 1395 .data = &fs_overflowuid, 1396 .maxlen = sizeof(int), 1397 .mode = 0644, 1398 .proc_handler = proc_dointvec_minmax, 1399 .extra1 = &minolduid, 1400 .extra2 = &maxolduid, 1401 }, 1402 { 1403 .procname = "overflowgid", 1404 .data = &fs_overflowgid, 1405 .maxlen = sizeof(int), 1406 .mode = 0644, 1407 .proc_handler = proc_dointvec_minmax, 1408 .extra1 = &minolduid, 1409 .extra2 = &maxolduid, 1410 }, 1411 #ifdef CONFIG_FILE_LOCKING 1412 { 1413 .procname = "leases-enable", 1414 .data = &leases_enable, 1415 .maxlen = sizeof(int), 1416 .mode = 0644, 1417 .proc_handler = proc_dointvec, 1418 }, 1419 #endif 1420 #ifdef CONFIG_DNOTIFY 1421 { 1422 .procname = "dir-notify-enable", 1423 .data = &dir_notify_enable, 1424 .maxlen = sizeof(int), 1425 .mode = 0644, 1426 .proc_handler = proc_dointvec, 1427 }, 1428 #endif 1429 #ifdef CONFIG_MMU 1430 #ifdef CONFIG_FILE_LOCKING 1431 { 1432 .procname = "lease-break-time", 1433 .data = &lease_break_time, 1434 .maxlen = sizeof(int), 1435 .mode = 0644, 1436 .proc_handler = proc_dointvec, 1437 }, 1438 #endif 1439 #ifdef CONFIG_AIO 1440 { 1441 .procname = "aio-nr", 1442 .data = &aio_nr, 1443 .maxlen = sizeof(aio_nr), 1444 .mode = 0444, 1445 .proc_handler = proc_doulongvec_minmax, 1446 }, 1447 { 1448 .procname = "aio-max-nr", 1449 .data = &aio_max_nr, 1450 .maxlen = sizeof(aio_max_nr), 1451 .mode = 0644, 1452 .proc_handler = proc_doulongvec_minmax, 1453 }, 1454 #endif /* CONFIG_AIO */ 1455 #ifdef CONFIG_INOTIFY_USER 1456 { 1457 .procname = "inotify", 1458 .mode = 0555, 1459 .child = inotify_table, 1460 }, 1461 #endif 1462 #ifdef CONFIG_EPOLL 1463 { 1464 .procname = "epoll", 1465 .mode = 0555, 1466 .child = epoll_table, 1467 }, 1468 #endif 1469 #endif 1470 { 1471 .procname = "suid_dumpable", 1472 .data = &suid_dumpable, 1473 .maxlen = sizeof(int), 1474 .mode = 0644, 1475 .proc_handler = proc_dointvec_minmax, 1476 .extra1 = &zero, 1477 .extra2 = &two, 1478 }, 1479 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1480 { 1481 .procname = "binfmt_misc", 1482 .mode = 0555, 1483 .child = binfmt_misc_table, 1484 }, 1485 #endif 1486 { 1487 .procname = "pipe-max-size", 1488 .data = &pipe_max_size, 1489 .maxlen = sizeof(int), 1490 .mode = 0644, 1491 .proc_handler = &pipe_proc_fn, 1492 .extra1 = &pipe_min_size, 1493 }, 1494 { } 1495 }; 1496 1497 static struct ctl_table debug_table[] = { 1498 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1499 defined(CONFIG_S390) 1500 { 1501 .procname = "exception-trace", 1502 .data = &show_unhandled_signals, 1503 .maxlen = sizeof(int), 1504 .mode = 0644, 1505 .proc_handler = proc_dointvec 1506 }, 1507 #endif 1508 #if defined(CONFIG_OPTPROBES) 1509 { 1510 .procname = "kprobes-optimization", 1511 .data = &sysctl_kprobes_optimization, 1512 .maxlen = sizeof(int), 1513 .mode = 0644, 1514 .proc_handler = proc_kprobes_optimization_handler, 1515 .extra1 = &zero, 1516 .extra2 = &one, 1517 }, 1518 #endif 1519 { } 1520 }; 1521 1522 static struct ctl_table dev_table[] = { 1523 { } 1524 }; 1525 1526 static DEFINE_SPINLOCK(sysctl_lock); 1527 1528 /* called under sysctl_lock */ 1529 static int use_table(struct ctl_table_header *p) 1530 { 1531 if (unlikely(p->unregistering)) 1532 return 0; 1533 p->used++; 1534 return 1; 1535 } 1536 1537 /* called under sysctl_lock */ 1538 static void unuse_table(struct ctl_table_header *p) 1539 { 1540 if (!--p->used) 1541 if (unlikely(p->unregistering)) 1542 complete(p->unregistering); 1543 } 1544 1545 /* called under sysctl_lock, will reacquire if has to wait */ 1546 static void start_unregistering(struct ctl_table_header *p) 1547 { 1548 /* 1549 * if p->used is 0, nobody will ever touch that entry again; 1550 * we'll eliminate all paths to it before dropping sysctl_lock 1551 */ 1552 if (unlikely(p->used)) { 1553 struct completion wait; 1554 init_completion(&wait); 1555 p->unregistering = &wait; 1556 spin_unlock(&sysctl_lock); 1557 wait_for_completion(&wait); 1558 spin_lock(&sysctl_lock); 1559 } else { 1560 /* anything non-NULL; we'll never dereference it */ 1561 p->unregistering = ERR_PTR(-EINVAL); 1562 } 1563 /* 1564 * do not remove from the list until nobody holds it; walking the 1565 * list in do_sysctl() relies on that. 1566 */ 1567 list_del_init(&p->ctl_entry); 1568 } 1569 1570 void sysctl_head_get(struct ctl_table_header *head) 1571 { 1572 spin_lock(&sysctl_lock); 1573 head->count++; 1574 spin_unlock(&sysctl_lock); 1575 } 1576 1577 static void free_head(struct rcu_head *rcu) 1578 { 1579 kfree(container_of(rcu, struct ctl_table_header, rcu)); 1580 } 1581 1582 void sysctl_head_put(struct ctl_table_header *head) 1583 { 1584 spin_lock(&sysctl_lock); 1585 if (!--head->count) 1586 call_rcu(&head->rcu, free_head); 1587 spin_unlock(&sysctl_lock); 1588 } 1589 1590 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1591 { 1592 if (!head) 1593 BUG(); 1594 spin_lock(&sysctl_lock); 1595 if (!use_table(head)) 1596 head = ERR_PTR(-ENOENT); 1597 spin_unlock(&sysctl_lock); 1598 return head; 1599 } 1600 1601 void sysctl_head_finish(struct ctl_table_header *head) 1602 { 1603 if (!head) 1604 return; 1605 spin_lock(&sysctl_lock); 1606 unuse_table(head); 1607 spin_unlock(&sysctl_lock); 1608 } 1609 1610 static struct ctl_table_set * 1611 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1612 { 1613 struct ctl_table_set *set = &root->default_set; 1614 if (root->lookup) 1615 set = root->lookup(root, namespaces); 1616 return set; 1617 } 1618 1619 static struct list_head * 1620 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1621 { 1622 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1623 return &set->list; 1624 } 1625 1626 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1627 struct ctl_table_header *prev) 1628 { 1629 struct ctl_table_root *root; 1630 struct list_head *header_list; 1631 struct ctl_table_header *head; 1632 struct list_head *tmp; 1633 1634 spin_lock(&sysctl_lock); 1635 if (prev) { 1636 head = prev; 1637 tmp = &prev->ctl_entry; 1638 unuse_table(prev); 1639 goto next; 1640 } 1641 tmp = &root_table_header.ctl_entry; 1642 for (;;) { 1643 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1644 1645 if (!use_table(head)) 1646 goto next; 1647 spin_unlock(&sysctl_lock); 1648 return head; 1649 next: 1650 root = head->root; 1651 tmp = tmp->next; 1652 header_list = lookup_header_list(root, namespaces); 1653 if (tmp != header_list) 1654 continue; 1655 1656 do { 1657 root = list_entry(root->root_list.next, 1658 struct ctl_table_root, root_list); 1659 if (root == &sysctl_table_root) 1660 goto out; 1661 header_list = lookup_header_list(root, namespaces); 1662 } while (list_empty(header_list)); 1663 tmp = header_list->next; 1664 } 1665 out: 1666 spin_unlock(&sysctl_lock); 1667 return NULL; 1668 } 1669 1670 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1671 { 1672 return __sysctl_head_next(current->nsproxy, prev); 1673 } 1674 1675 void register_sysctl_root(struct ctl_table_root *root) 1676 { 1677 spin_lock(&sysctl_lock); 1678 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1679 spin_unlock(&sysctl_lock); 1680 } 1681 1682 /* 1683 * sysctl_perm does NOT grant the superuser all rights automatically, because 1684 * some sysctl variables are readonly even to root. 1685 */ 1686 1687 static int test_perm(int mode, int op) 1688 { 1689 if (!current_euid()) 1690 mode >>= 6; 1691 else if (in_egroup_p(0)) 1692 mode >>= 3; 1693 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1694 return 0; 1695 return -EACCES; 1696 } 1697 1698 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1699 { 1700 int mode; 1701 1702 if (root->permissions) 1703 mode = root->permissions(root, current->nsproxy, table); 1704 else 1705 mode = table->mode; 1706 1707 return test_perm(mode, op); 1708 } 1709 1710 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1711 { 1712 for (; table->procname; table++) { 1713 table->parent = parent; 1714 if (table->child) 1715 sysctl_set_parent(table, table->child); 1716 } 1717 } 1718 1719 static __init int sysctl_init(void) 1720 { 1721 sysctl_set_parent(NULL, root_table); 1722 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1723 sysctl_check_table(current->nsproxy, root_table); 1724 #endif 1725 return 0; 1726 } 1727 1728 core_initcall(sysctl_init); 1729 1730 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1731 struct ctl_table *table) 1732 { 1733 struct ctl_table *p; 1734 const char *s = branch->procname; 1735 1736 /* branch should have named subdirectory as its first element */ 1737 if (!s || !branch->child) 1738 return NULL; 1739 1740 /* ... and nothing else */ 1741 if (branch[1].procname) 1742 return NULL; 1743 1744 /* table should contain subdirectory with the same name */ 1745 for (p = table; p->procname; p++) { 1746 if (!p->child) 1747 continue; 1748 if (p->procname && strcmp(p->procname, s) == 0) 1749 return p; 1750 } 1751 return NULL; 1752 } 1753 1754 /* see if attaching q to p would be an improvement */ 1755 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1756 { 1757 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1758 struct ctl_table *next; 1759 int is_better = 0; 1760 int not_in_parent = !p->attached_by; 1761 1762 while ((next = is_branch_in(by, to)) != NULL) { 1763 if (by == q->attached_by) 1764 is_better = 1; 1765 if (to == p->attached_by) 1766 not_in_parent = 1; 1767 by = by->child; 1768 to = next->child; 1769 } 1770 1771 if (is_better && not_in_parent) { 1772 q->attached_by = by; 1773 q->attached_to = to; 1774 q->parent = p; 1775 } 1776 } 1777 1778 /** 1779 * __register_sysctl_paths - register a sysctl hierarchy 1780 * @root: List of sysctl headers to register on 1781 * @namespaces: Data to compute which lists of sysctl entries are visible 1782 * @path: The path to the directory the sysctl table is in. 1783 * @table: the top-level table structure 1784 * 1785 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1786 * array. A completely 0 filled entry terminates the table. 1787 * 1788 * The members of the &struct ctl_table structure are used as follows: 1789 * 1790 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1791 * enter a sysctl file 1792 * 1793 * data - a pointer to data for use by proc_handler 1794 * 1795 * maxlen - the maximum size in bytes of the data 1796 * 1797 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1798 * 1799 * child - a pointer to the child sysctl table if this entry is a directory, or 1800 * %NULL. 1801 * 1802 * proc_handler - the text handler routine (described below) 1803 * 1804 * de - for internal use by the sysctl routines 1805 * 1806 * extra1, extra2 - extra pointers usable by the proc handler routines 1807 * 1808 * Leaf nodes in the sysctl tree will be represented by a single file 1809 * under /proc; non-leaf nodes will be represented by directories. 1810 * 1811 * sysctl(2) can automatically manage read and write requests through 1812 * the sysctl table. The data and maxlen fields of the ctl_table 1813 * struct enable minimal validation of the values being written to be 1814 * performed, and the mode field allows minimal authentication. 1815 * 1816 * There must be a proc_handler routine for any terminal nodes 1817 * mirrored under /proc/sys (non-terminals are handled by a built-in 1818 * directory handler). Several default handlers are available to 1819 * cover common cases - 1820 * 1821 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1822 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1823 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1824 * 1825 * It is the handler's job to read the input buffer from user memory 1826 * and process it. The handler should return 0 on success. 1827 * 1828 * This routine returns %NULL on a failure to register, and a pointer 1829 * to the table header on success. 1830 */ 1831 struct ctl_table_header *__register_sysctl_paths( 1832 struct ctl_table_root *root, 1833 struct nsproxy *namespaces, 1834 const struct ctl_path *path, struct ctl_table *table) 1835 { 1836 struct ctl_table_header *header; 1837 struct ctl_table *new, **prevp; 1838 unsigned int n, npath; 1839 struct ctl_table_set *set; 1840 1841 /* Count the path components */ 1842 for (npath = 0; path[npath].procname; ++npath) 1843 ; 1844 1845 /* 1846 * For each path component, allocate a 2-element ctl_table array. 1847 * The first array element will be filled with the sysctl entry 1848 * for this, the second will be the sentinel (procname == 0). 1849 * 1850 * We allocate everything in one go so that we don't have to 1851 * worry about freeing additional memory in unregister_sysctl_table. 1852 */ 1853 header = kzalloc(sizeof(struct ctl_table_header) + 1854 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1855 if (!header) 1856 return NULL; 1857 1858 new = (struct ctl_table *) (header + 1); 1859 1860 /* Now connect the dots */ 1861 prevp = &header->ctl_table; 1862 for (n = 0; n < npath; ++n, ++path) { 1863 /* Copy the procname */ 1864 new->procname = path->procname; 1865 new->mode = 0555; 1866 1867 *prevp = new; 1868 prevp = &new->child; 1869 1870 new += 2; 1871 } 1872 *prevp = table; 1873 header->ctl_table_arg = table; 1874 1875 INIT_LIST_HEAD(&header->ctl_entry); 1876 header->used = 0; 1877 header->unregistering = NULL; 1878 header->root = root; 1879 sysctl_set_parent(NULL, header->ctl_table); 1880 header->count = 1; 1881 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1882 if (sysctl_check_table(namespaces, header->ctl_table)) { 1883 kfree(header); 1884 return NULL; 1885 } 1886 #endif 1887 spin_lock(&sysctl_lock); 1888 header->set = lookup_header_set(root, namespaces); 1889 header->attached_by = header->ctl_table; 1890 header->attached_to = root_table; 1891 header->parent = &root_table_header; 1892 for (set = header->set; set; set = set->parent) { 1893 struct ctl_table_header *p; 1894 list_for_each_entry(p, &set->list, ctl_entry) { 1895 if (p->unregistering) 1896 continue; 1897 try_attach(p, header); 1898 } 1899 } 1900 header->parent->count++; 1901 list_add_tail(&header->ctl_entry, &header->set->list); 1902 spin_unlock(&sysctl_lock); 1903 1904 return header; 1905 } 1906 1907 /** 1908 * register_sysctl_table_path - register a sysctl table hierarchy 1909 * @path: The path to the directory the sysctl table is in. 1910 * @table: the top-level table structure 1911 * 1912 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1913 * array. A completely 0 filled entry terminates the table. 1914 * 1915 * See __register_sysctl_paths for more details. 1916 */ 1917 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1918 struct ctl_table *table) 1919 { 1920 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1921 path, table); 1922 } 1923 1924 /** 1925 * register_sysctl_table - register a sysctl table hierarchy 1926 * @table: the top-level table structure 1927 * 1928 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1929 * array. A completely 0 filled entry terminates the table. 1930 * 1931 * See register_sysctl_paths for more details. 1932 */ 1933 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1934 { 1935 static const struct ctl_path null_path[] = { {} }; 1936 1937 return register_sysctl_paths(null_path, table); 1938 } 1939 1940 /** 1941 * unregister_sysctl_table - unregister a sysctl table hierarchy 1942 * @header: the header returned from register_sysctl_table 1943 * 1944 * Unregisters the sysctl table and all children. proc entries may not 1945 * actually be removed until they are no longer used by anyone. 1946 */ 1947 void unregister_sysctl_table(struct ctl_table_header * header) 1948 { 1949 might_sleep(); 1950 1951 if (header == NULL) 1952 return; 1953 1954 spin_lock(&sysctl_lock); 1955 start_unregistering(header); 1956 if (!--header->parent->count) { 1957 WARN_ON(1); 1958 call_rcu(&header->parent->rcu, free_head); 1959 } 1960 if (!--header->count) 1961 call_rcu(&header->rcu, free_head); 1962 spin_unlock(&sysctl_lock); 1963 } 1964 1965 int sysctl_is_seen(struct ctl_table_header *p) 1966 { 1967 struct ctl_table_set *set = p->set; 1968 int res; 1969 spin_lock(&sysctl_lock); 1970 if (p->unregistering) 1971 res = 0; 1972 else if (!set->is_seen) 1973 res = 1; 1974 else 1975 res = set->is_seen(set); 1976 spin_unlock(&sysctl_lock); 1977 return res; 1978 } 1979 1980 void setup_sysctl_set(struct ctl_table_set *p, 1981 struct ctl_table_set *parent, 1982 int (*is_seen)(struct ctl_table_set *)) 1983 { 1984 INIT_LIST_HEAD(&p->list); 1985 p->parent = parent ? parent : &sysctl_table_root.default_set; 1986 p->is_seen = is_seen; 1987 } 1988 1989 #else /* !CONFIG_SYSCTL */ 1990 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1991 { 1992 return NULL; 1993 } 1994 1995 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1996 struct ctl_table *table) 1997 { 1998 return NULL; 1999 } 2000 2001 void unregister_sysctl_table(struct ctl_table_header * table) 2002 { 2003 } 2004 2005 void setup_sysctl_set(struct ctl_table_set *p, 2006 struct ctl_table_set *parent, 2007 int (*is_seen)(struct ctl_table_set *)) 2008 { 2009 } 2010 2011 void sysctl_head_put(struct ctl_table_header *head) 2012 { 2013 } 2014 2015 #endif /* CONFIG_SYSCTL */ 2016 2017 /* 2018 * /proc/sys support 2019 */ 2020 2021 #ifdef CONFIG_PROC_SYSCTL 2022 2023 static int _proc_do_string(void* data, int maxlen, int write, 2024 void __user *buffer, 2025 size_t *lenp, loff_t *ppos) 2026 { 2027 size_t len; 2028 char __user *p; 2029 char c; 2030 2031 if (!data || !maxlen || !*lenp) { 2032 *lenp = 0; 2033 return 0; 2034 } 2035 2036 if (write) { 2037 len = 0; 2038 p = buffer; 2039 while (len < *lenp) { 2040 if (get_user(c, p++)) 2041 return -EFAULT; 2042 if (c == 0 || c == '\n') 2043 break; 2044 len++; 2045 } 2046 if (len >= maxlen) 2047 len = maxlen-1; 2048 if(copy_from_user(data, buffer, len)) 2049 return -EFAULT; 2050 ((char *) data)[len] = 0; 2051 *ppos += *lenp; 2052 } else { 2053 len = strlen(data); 2054 if (len > maxlen) 2055 len = maxlen; 2056 2057 if (*ppos > len) { 2058 *lenp = 0; 2059 return 0; 2060 } 2061 2062 data += *ppos; 2063 len -= *ppos; 2064 2065 if (len > *lenp) 2066 len = *lenp; 2067 if (len) 2068 if(copy_to_user(buffer, data, len)) 2069 return -EFAULT; 2070 if (len < *lenp) { 2071 if(put_user('\n', ((char __user *) buffer) + len)) 2072 return -EFAULT; 2073 len++; 2074 } 2075 *lenp = len; 2076 *ppos += len; 2077 } 2078 return 0; 2079 } 2080 2081 /** 2082 * proc_dostring - read a string sysctl 2083 * @table: the sysctl table 2084 * @write: %TRUE if this is a write to the sysctl file 2085 * @buffer: the user buffer 2086 * @lenp: the size of the user buffer 2087 * @ppos: file position 2088 * 2089 * Reads/writes a string from/to the user buffer. If the kernel 2090 * buffer provided is not large enough to hold the string, the 2091 * string is truncated. The copied string is %NULL-terminated. 2092 * If the string is being read by the user process, it is copied 2093 * and a newline '\n' is added. It is truncated if the buffer is 2094 * not large enough. 2095 * 2096 * Returns 0 on success. 2097 */ 2098 int proc_dostring(struct ctl_table *table, int write, 2099 void __user *buffer, size_t *lenp, loff_t *ppos) 2100 { 2101 return _proc_do_string(table->data, table->maxlen, write, 2102 buffer, lenp, ppos); 2103 } 2104 2105 static size_t proc_skip_spaces(char **buf) 2106 { 2107 size_t ret; 2108 char *tmp = skip_spaces(*buf); 2109 ret = tmp - *buf; 2110 *buf = tmp; 2111 return ret; 2112 } 2113 2114 static void proc_skip_char(char **buf, size_t *size, const char v) 2115 { 2116 while (*size) { 2117 if (**buf != v) 2118 break; 2119 (*size)--; 2120 (*buf)++; 2121 } 2122 } 2123 2124 #define TMPBUFLEN 22 2125 /** 2126 * proc_get_long - reads an ASCII formatted integer from a user buffer 2127 * 2128 * @buf: a kernel buffer 2129 * @size: size of the kernel buffer 2130 * @val: this is where the number will be stored 2131 * @neg: set to %TRUE if number is negative 2132 * @perm_tr: a vector which contains the allowed trailers 2133 * @perm_tr_len: size of the perm_tr vector 2134 * @tr: pointer to store the trailer character 2135 * 2136 * In case of success %0 is returned and @buf and @size are updated with 2137 * the amount of bytes read. If @tr is non-NULL and a trailing 2138 * character exists (size is non-zero after returning from this 2139 * function), @tr is updated with the trailing character. 2140 */ 2141 static int proc_get_long(char **buf, size_t *size, 2142 unsigned long *val, bool *neg, 2143 const char *perm_tr, unsigned perm_tr_len, char *tr) 2144 { 2145 int len; 2146 char *p, tmp[TMPBUFLEN]; 2147 2148 if (!*size) 2149 return -EINVAL; 2150 2151 len = *size; 2152 if (len > TMPBUFLEN - 1) 2153 len = TMPBUFLEN - 1; 2154 2155 memcpy(tmp, *buf, len); 2156 2157 tmp[len] = 0; 2158 p = tmp; 2159 if (*p == '-' && *size > 1) { 2160 *neg = true; 2161 p++; 2162 } else 2163 *neg = false; 2164 if (!isdigit(*p)) 2165 return -EINVAL; 2166 2167 *val = simple_strtoul(p, &p, 0); 2168 2169 len = p - tmp; 2170 2171 /* We don't know if the next char is whitespace thus we may accept 2172 * invalid integers (e.g. 1234...a) or two integers instead of one 2173 * (e.g. 123...1). So lets not allow such large numbers. */ 2174 if (len == TMPBUFLEN - 1) 2175 return -EINVAL; 2176 2177 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2178 return -EINVAL; 2179 2180 if (tr && (len < *size)) 2181 *tr = *p; 2182 2183 *buf += len; 2184 *size -= len; 2185 2186 return 0; 2187 } 2188 2189 /** 2190 * proc_put_long - converts an integer to a decimal ASCII formatted string 2191 * 2192 * @buf: the user buffer 2193 * @size: the size of the user buffer 2194 * @val: the integer to be converted 2195 * @neg: sign of the number, %TRUE for negative 2196 * 2197 * In case of success %0 is returned and @buf and @size are updated with 2198 * the amount of bytes written. 2199 */ 2200 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2201 bool neg) 2202 { 2203 int len; 2204 char tmp[TMPBUFLEN], *p = tmp; 2205 2206 sprintf(p, "%s%lu", neg ? "-" : "", val); 2207 len = strlen(tmp); 2208 if (len > *size) 2209 len = *size; 2210 if (copy_to_user(*buf, tmp, len)) 2211 return -EFAULT; 2212 *size -= len; 2213 *buf += len; 2214 return 0; 2215 } 2216 #undef TMPBUFLEN 2217 2218 static int proc_put_char(void __user **buf, size_t *size, char c) 2219 { 2220 if (*size) { 2221 char __user **buffer = (char __user **)buf; 2222 if (put_user(c, *buffer)) 2223 return -EFAULT; 2224 (*size)--, (*buffer)++; 2225 *buf = *buffer; 2226 } 2227 return 0; 2228 } 2229 2230 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2231 int *valp, 2232 int write, void *data) 2233 { 2234 if (write) { 2235 *valp = *negp ? -*lvalp : *lvalp; 2236 } else { 2237 int val = *valp; 2238 if (val < 0) { 2239 *negp = true; 2240 *lvalp = (unsigned long)-val; 2241 } else { 2242 *negp = false; 2243 *lvalp = (unsigned long)val; 2244 } 2245 } 2246 return 0; 2247 } 2248 2249 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2250 2251 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2252 int write, void __user *buffer, 2253 size_t *lenp, loff_t *ppos, 2254 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2255 int write, void *data), 2256 void *data) 2257 { 2258 int *i, vleft, first = 1, err = 0; 2259 unsigned long page = 0; 2260 size_t left; 2261 char *kbuf; 2262 2263 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2264 *lenp = 0; 2265 return 0; 2266 } 2267 2268 i = (int *) tbl_data; 2269 vleft = table->maxlen / sizeof(*i); 2270 left = *lenp; 2271 2272 if (!conv) 2273 conv = do_proc_dointvec_conv; 2274 2275 if (write) { 2276 if (left > PAGE_SIZE - 1) 2277 left = PAGE_SIZE - 1; 2278 page = __get_free_page(GFP_TEMPORARY); 2279 kbuf = (char *) page; 2280 if (!kbuf) 2281 return -ENOMEM; 2282 if (copy_from_user(kbuf, buffer, left)) { 2283 err = -EFAULT; 2284 goto free; 2285 } 2286 kbuf[left] = 0; 2287 } 2288 2289 for (; left && vleft--; i++, first=0) { 2290 unsigned long lval; 2291 bool neg; 2292 2293 if (write) { 2294 left -= proc_skip_spaces(&kbuf); 2295 2296 if (!left) 2297 break; 2298 err = proc_get_long(&kbuf, &left, &lval, &neg, 2299 proc_wspace_sep, 2300 sizeof(proc_wspace_sep), NULL); 2301 if (err) 2302 break; 2303 if (conv(&neg, &lval, i, 1, data)) { 2304 err = -EINVAL; 2305 break; 2306 } 2307 } else { 2308 if (conv(&neg, &lval, i, 0, data)) { 2309 err = -EINVAL; 2310 break; 2311 } 2312 if (!first) 2313 err = proc_put_char(&buffer, &left, '\t'); 2314 if (err) 2315 break; 2316 err = proc_put_long(&buffer, &left, lval, neg); 2317 if (err) 2318 break; 2319 } 2320 } 2321 2322 if (!write && !first && left && !err) 2323 err = proc_put_char(&buffer, &left, '\n'); 2324 if (write && !err && left) 2325 left -= proc_skip_spaces(&kbuf); 2326 free: 2327 if (write) { 2328 free_page(page); 2329 if (first) 2330 return err ? : -EINVAL; 2331 } 2332 *lenp -= left; 2333 *ppos += *lenp; 2334 return err; 2335 } 2336 2337 static int do_proc_dointvec(struct ctl_table *table, int write, 2338 void __user *buffer, size_t *lenp, loff_t *ppos, 2339 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2340 int write, void *data), 2341 void *data) 2342 { 2343 return __do_proc_dointvec(table->data, table, write, 2344 buffer, lenp, ppos, conv, data); 2345 } 2346 2347 /** 2348 * proc_dointvec - read a vector of integers 2349 * @table: the sysctl table 2350 * @write: %TRUE if this is a write to the sysctl file 2351 * @buffer: the user buffer 2352 * @lenp: the size of the user buffer 2353 * @ppos: file position 2354 * 2355 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2356 * values from/to the user buffer, treated as an ASCII string. 2357 * 2358 * Returns 0 on success. 2359 */ 2360 int proc_dointvec(struct ctl_table *table, int write, 2361 void __user *buffer, size_t *lenp, loff_t *ppos) 2362 { 2363 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2364 NULL,NULL); 2365 } 2366 2367 /* 2368 * Taint values can only be increased 2369 * This means we can safely use a temporary. 2370 */ 2371 static int proc_taint(struct ctl_table *table, int write, 2372 void __user *buffer, size_t *lenp, loff_t *ppos) 2373 { 2374 struct ctl_table t; 2375 unsigned long tmptaint = get_taint(); 2376 int err; 2377 2378 if (write && !capable(CAP_SYS_ADMIN)) 2379 return -EPERM; 2380 2381 t = *table; 2382 t.data = &tmptaint; 2383 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2384 if (err < 0) 2385 return err; 2386 2387 if (write) { 2388 /* 2389 * Poor man's atomic or. Not worth adding a primitive 2390 * to everyone's atomic.h for this 2391 */ 2392 int i; 2393 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2394 if ((tmptaint >> i) & 1) 2395 add_taint(i); 2396 } 2397 } 2398 2399 return err; 2400 } 2401 2402 #ifdef CONFIG_PRINTK 2403 static int proc_dmesg_restrict(struct ctl_table *table, int write, 2404 void __user *buffer, size_t *lenp, loff_t *ppos) 2405 { 2406 if (write && !capable(CAP_SYS_ADMIN)) 2407 return -EPERM; 2408 2409 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2410 } 2411 #endif 2412 2413 struct do_proc_dointvec_minmax_conv_param { 2414 int *min; 2415 int *max; 2416 }; 2417 2418 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2419 int *valp, 2420 int write, void *data) 2421 { 2422 struct do_proc_dointvec_minmax_conv_param *param = data; 2423 if (write) { 2424 int val = *negp ? -*lvalp : *lvalp; 2425 if ((param->min && *param->min > val) || 2426 (param->max && *param->max < val)) 2427 return -EINVAL; 2428 *valp = val; 2429 } else { 2430 int val = *valp; 2431 if (val < 0) { 2432 *negp = true; 2433 *lvalp = (unsigned long)-val; 2434 } else { 2435 *negp = false; 2436 *lvalp = (unsigned long)val; 2437 } 2438 } 2439 return 0; 2440 } 2441 2442 /** 2443 * proc_dointvec_minmax - read a vector of integers with min/max values 2444 * @table: the sysctl table 2445 * @write: %TRUE if this is a write to the sysctl file 2446 * @buffer: the user buffer 2447 * @lenp: the size of the user buffer 2448 * @ppos: file position 2449 * 2450 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2451 * values from/to the user buffer, treated as an ASCII string. 2452 * 2453 * This routine will ensure the values are within the range specified by 2454 * table->extra1 (min) and table->extra2 (max). 2455 * 2456 * Returns 0 on success. 2457 */ 2458 int proc_dointvec_minmax(struct ctl_table *table, int write, 2459 void __user *buffer, size_t *lenp, loff_t *ppos) 2460 { 2461 struct do_proc_dointvec_minmax_conv_param param = { 2462 .min = (int *) table->extra1, 2463 .max = (int *) table->extra2, 2464 }; 2465 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2466 do_proc_dointvec_minmax_conv, ¶m); 2467 } 2468 2469 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2470 void __user *buffer, 2471 size_t *lenp, loff_t *ppos, 2472 unsigned long convmul, 2473 unsigned long convdiv) 2474 { 2475 unsigned long *i, *min, *max; 2476 int vleft, first = 1, err = 0; 2477 unsigned long page = 0; 2478 size_t left; 2479 char *kbuf; 2480 2481 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2482 *lenp = 0; 2483 return 0; 2484 } 2485 2486 i = (unsigned long *) data; 2487 min = (unsigned long *) table->extra1; 2488 max = (unsigned long *) table->extra2; 2489 vleft = table->maxlen / sizeof(unsigned long); 2490 left = *lenp; 2491 2492 if (write) { 2493 if (left > PAGE_SIZE - 1) 2494 left = PAGE_SIZE - 1; 2495 page = __get_free_page(GFP_TEMPORARY); 2496 kbuf = (char *) page; 2497 if (!kbuf) 2498 return -ENOMEM; 2499 if (copy_from_user(kbuf, buffer, left)) { 2500 err = -EFAULT; 2501 goto free; 2502 } 2503 kbuf[left] = 0; 2504 } 2505 2506 for (; left && vleft--; i++, first = 0) { 2507 unsigned long val; 2508 2509 if (write) { 2510 bool neg; 2511 2512 left -= proc_skip_spaces(&kbuf); 2513 2514 err = proc_get_long(&kbuf, &left, &val, &neg, 2515 proc_wspace_sep, 2516 sizeof(proc_wspace_sep), NULL); 2517 if (err) 2518 break; 2519 if (neg) 2520 continue; 2521 if ((min && val < *min) || (max && val > *max)) 2522 continue; 2523 *i = val; 2524 } else { 2525 val = convdiv * (*i) / convmul; 2526 if (!first) 2527 err = proc_put_char(&buffer, &left, '\t'); 2528 err = proc_put_long(&buffer, &left, val, false); 2529 if (err) 2530 break; 2531 } 2532 } 2533 2534 if (!write && !first && left && !err) 2535 err = proc_put_char(&buffer, &left, '\n'); 2536 if (write && !err) 2537 left -= proc_skip_spaces(&kbuf); 2538 free: 2539 if (write) { 2540 free_page(page); 2541 if (first) 2542 return err ? : -EINVAL; 2543 } 2544 *lenp -= left; 2545 *ppos += *lenp; 2546 return err; 2547 } 2548 2549 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2550 void __user *buffer, 2551 size_t *lenp, loff_t *ppos, 2552 unsigned long convmul, 2553 unsigned long convdiv) 2554 { 2555 return __do_proc_doulongvec_minmax(table->data, table, write, 2556 buffer, lenp, ppos, convmul, convdiv); 2557 } 2558 2559 /** 2560 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2561 * @table: the sysctl table 2562 * @write: %TRUE if this is a write to the sysctl file 2563 * @buffer: the user buffer 2564 * @lenp: the size of the user buffer 2565 * @ppos: file position 2566 * 2567 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2568 * values from/to the user buffer, treated as an ASCII string. 2569 * 2570 * This routine will ensure the values are within the range specified by 2571 * table->extra1 (min) and table->extra2 (max). 2572 * 2573 * Returns 0 on success. 2574 */ 2575 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2576 void __user *buffer, size_t *lenp, loff_t *ppos) 2577 { 2578 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2579 } 2580 2581 /** 2582 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2583 * @table: the sysctl table 2584 * @write: %TRUE if this is a write to the sysctl file 2585 * @buffer: the user buffer 2586 * @lenp: the size of the user buffer 2587 * @ppos: file position 2588 * 2589 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2590 * values from/to the user buffer, treated as an ASCII string. The values 2591 * are treated as milliseconds, and converted to jiffies when they are stored. 2592 * 2593 * This routine will ensure the values are within the range specified by 2594 * table->extra1 (min) and table->extra2 (max). 2595 * 2596 * Returns 0 on success. 2597 */ 2598 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2599 void __user *buffer, 2600 size_t *lenp, loff_t *ppos) 2601 { 2602 return do_proc_doulongvec_minmax(table, write, buffer, 2603 lenp, ppos, HZ, 1000l); 2604 } 2605 2606 2607 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2608 int *valp, 2609 int write, void *data) 2610 { 2611 if (write) { 2612 if (*lvalp > LONG_MAX / HZ) 2613 return 1; 2614 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2615 } else { 2616 int val = *valp; 2617 unsigned long lval; 2618 if (val < 0) { 2619 *negp = true; 2620 lval = (unsigned long)-val; 2621 } else { 2622 *negp = false; 2623 lval = (unsigned long)val; 2624 } 2625 *lvalp = lval / HZ; 2626 } 2627 return 0; 2628 } 2629 2630 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2631 int *valp, 2632 int write, void *data) 2633 { 2634 if (write) { 2635 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2636 return 1; 2637 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2638 } else { 2639 int val = *valp; 2640 unsigned long lval; 2641 if (val < 0) { 2642 *negp = true; 2643 lval = (unsigned long)-val; 2644 } else { 2645 *negp = false; 2646 lval = (unsigned long)val; 2647 } 2648 *lvalp = jiffies_to_clock_t(lval); 2649 } 2650 return 0; 2651 } 2652 2653 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2654 int *valp, 2655 int write, void *data) 2656 { 2657 if (write) { 2658 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2659 } else { 2660 int val = *valp; 2661 unsigned long lval; 2662 if (val < 0) { 2663 *negp = true; 2664 lval = (unsigned long)-val; 2665 } else { 2666 *negp = false; 2667 lval = (unsigned long)val; 2668 } 2669 *lvalp = jiffies_to_msecs(lval); 2670 } 2671 return 0; 2672 } 2673 2674 /** 2675 * proc_dointvec_jiffies - read a vector of integers as seconds 2676 * @table: the sysctl table 2677 * @write: %TRUE if this is a write to the sysctl file 2678 * @buffer: the user buffer 2679 * @lenp: the size of the user buffer 2680 * @ppos: file position 2681 * 2682 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2683 * values from/to the user buffer, treated as an ASCII string. 2684 * The values read are assumed to be in seconds, and are converted into 2685 * jiffies. 2686 * 2687 * Returns 0 on success. 2688 */ 2689 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2690 void __user *buffer, size_t *lenp, loff_t *ppos) 2691 { 2692 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2693 do_proc_dointvec_jiffies_conv,NULL); 2694 } 2695 2696 /** 2697 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2698 * @table: the sysctl table 2699 * @write: %TRUE if this is a write to the sysctl file 2700 * @buffer: the user buffer 2701 * @lenp: the size of the user buffer 2702 * @ppos: pointer to the file position 2703 * 2704 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2705 * values from/to the user buffer, treated as an ASCII string. 2706 * The values read are assumed to be in 1/USER_HZ seconds, and 2707 * are converted into jiffies. 2708 * 2709 * Returns 0 on success. 2710 */ 2711 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2712 void __user *buffer, size_t *lenp, loff_t *ppos) 2713 { 2714 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2715 do_proc_dointvec_userhz_jiffies_conv,NULL); 2716 } 2717 2718 /** 2719 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2720 * @table: the sysctl table 2721 * @write: %TRUE if this is a write to the sysctl file 2722 * @buffer: the user buffer 2723 * @lenp: the size of the user buffer 2724 * @ppos: file position 2725 * @ppos: the current position in the file 2726 * 2727 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2728 * values from/to the user buffer, treated as an ASCII string. 2729 * The values read are assumed to be in 1/1000 seconds, and 2730 * are converted into jiffies. 2731 * 2732 * Returns 0 on success. 2733 */ 2734 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2735 void __user *buffer, size_t *lenp, loff_t *ppos) 2736 { 2737 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2738 do_proc_dointvec_ms_jiffies_conv, NULL); 2739 } 2740 2741 static int proc_do_cad_pid(struct ctl_table *table, int write, 2742 void __user *buffer, size_t *lenp, loff_t *ppos) 2743 { 2744 struct pid *new_pid; 2745 pid_t tmp; 2746 int r; 2747 2748 tmp = pid_vnr(cad_pid); 2749 2750 r = __do_proc_dointvec(&tmp, table, write, buffer, 2751 lenp, ppos, NULL, NULL); 2752 if (r || !write) 2753 return r; 2754 2755 new_pid = find_get_pid(tmp); 2756 if (!new_pid) 2757 return -ESRCH; 2758 2759 put_pid(xchg(&cad_pid, new_pid)); 2760 return 0; 2761 } 2762 2763 /** 2764 * proc_do_large_bitmap - read/write from/to a large bitmap 2765 * @table: the sysctl table 2766 * @write: %TRUE if this is a write to the sysctl file 2767 * @buffer: the user buffer 2768 * @lenp: the size of the user buffer 2769 * @ppos: file position 2770 * 2771 * The bitmap is stored at table->data and the bitmap length (in bits) 2772 * in table->maxlen. 2773 * 2774 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2775 * large bitmaps may be represented in a compact manner. Writing into 2776 * the file will clear the bitmap then update it with the given input. 2777 * 2778 * Returns 0 on success. 2779 */ 2780 int proc_do_large_bitmap(struct ctl_table *table, int write, 2781 void __user *buffer, size_t *lenp, loff_t *ppos) 2782 { 2783 int err = 0; 2784 bool first = 1; 2785 size_t left = *lenp; 2786 unsigned long bitmap_len = table->maxlen; 2787 unsigned long *bitmap = (unsigned long *) table->data; 2788 unsigned long *tmp_bitmap = NULL; 2789 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2790 2791 if (!bitmap_len || !left || (*ppos && !write)) { 2792 *lenp = 0; 2793 return 0; 2794 } 2795 2796 if (write) { 2797 unsigned long page = 0; 2798 char *kbuf; 2799 2800 if (left > PAGE_SIZE - 1) 2801 left = PAGE_SIZE - 1; 2802 2803 page = __get_free_page(GFP_TEMPORARY); 2804 kbuf = (char *) page; 2805 if (!kbuf) 2806 return -ENOMEM; 2807 if (copy_from_user(kbuf, buffer, left)) { 2808 free_page(page); 2809 return -EFAULT; 2810 } 2811 kbuf[left] = 0; 2812 2813 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2814 GFP_KERNEL); 2815 if (!tmp_bitmap) { 2816 free_page(page); 2817 return -ENOMEM; 2818 } 2819 proc_skip_char(&kbuf, &left, '\n'); 2820 while (!err && left) { 2821 unsigned long val_a, val_b; 2822 bool neg; 2823 2824 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2825 sizeof(tr_a), &c); 2826 if (err) 2827 break; 2828 if (val_a >= bitmap_len || neg) { 2829 err = -EINVAL; 2830 break; 2831 } 2832 2833 val_b = val_a; 2834 if (left) { 2835 kbuf++; 2836 left--; 2837 } 2838 2839 if (c == '-') { 2840 err = proc_get_long(&kbuf, &left, &val_b, 2841 &neg, tr_b, sizeof(tr_b), 2842 &c); 2843 if (err) 2844 break; 2845 if (val_b >= bitmap_len || neg || 2846 val_a > val_b) { 2847 err = -EINVAL; 2848 break; 2849 } 2850 if (left) { 2851 kbuf++; 2852 left--; 2853 } 2854 } 2855 2856 while (val_a <= val_b) 2857 set_bit(val_a++, tmp_bitmap); 2858 2859 first = 0; 2860 proc_skip_char(&kbuf, &left, '\n'); 2861 } 2862 free_page(page); 2863 } else { 2864 unsigned long bit_a, bit_b = 0; 2865 2866 while (left) { 2867 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2868 if (bit_a >= bitmap_len) 2869 break; 2870 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2871 bit_a + 1) - 1; 2872 2873 if (!first) { 2874 err = proc_put_char(&buffer, &left, ','); 2875 if (err) 2876 break; 2877 } 2878 err = proc_put_long(&buffer, &left, bit_a, false); 2879 if (err) 2880 break; 2881 if (bit_a != bit_b) { 2882 err = proc_put_char(&buffer, &left, '-'); 2883 if (err) 2884 break; 2885 err = proc_put_long(&buffer, &left, bit_b, false); 2886 if (err) 2887 break; 2888 } 2889 2890 first = 0; bit_b++; 2891 } 2892 if (!err) 2893 err = proc_put_char(&buffer, &left, '\n'); 2894 } 2895 2896 if (!err) { 2897 if (write) { 2898 if (*ppos) 2899 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2900 else 2901 memcpy(bitmap, tmp_bitmap, 2902 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2903 } 2904 kfree(tmp_bitmap); 2905 *lenp -= left; 2906 *ppos += *lenp; 2907 return 0; 2908 } else { 2909 kfree(tmp_bitmap); 2910 return err; 2911 } 2912 } 2913 2914 #else /* CONFIG_PROC_SYSCTL */ 2915 2916 int proc_dostring(struct ctl_table *table, int write, 2917 void __user *buffer, size_t *lenp, loff_t *ppos) 2918 { 2919 return -ENOSYS; 2920 } 2921 2922 int proc_dointvec(struct ctl_table *table, int write, 2923 void __user *buffer, size_t *lenp, loff_t *ppos) 2924 { 2925 return -ENOSYS; 2926 } 2927 2928 int proc_dointvec_minmax(struct ctl_table *table, int write, 2929 void __user *buffer, size_t *lenp, loff_t *ppos) 2930 { 2931 return -ENOSYS; 2932 } 2933 2934 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2935 void __user *buffer, size_t *lenp, loff_t *ppos) 2936 { 2937 return -ENOSYS; 2938 } 2939 2940 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2941 void __user *buffer, size_t *lenp, loff_t *ppos) 2942 { 2943 return -ENOSYS; 2944 } 2945 2946 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2947 void __user *buffer, size_t *lenp, loff_t *ppos) 2948 { 2949 return -ENOSYS; 2950 } 2951 2952 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2953 void __user *buffer, size_t *lenp, loff_t *ppos) 2954 { 2955 return -ENOSYS; 2956 } 2957 2958 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2959 void __user *buffer, 2960 size_t *lenp, loff_t *ppos) 2961 { 2962 return -ENOSYS; 2963 } 2964 2965 2966 #endif /* CONFIG_PROC_SYSCTL */ 2967 2968 /* 2969 * No sense putting this after each symbol definition, twice, 2970 * exception granted :-) 2971 */ 2972 EXPORT_SYMBOL(proc_dointvec); 2973 EXPORT_SYMBOL(proc_dointvec_jiffies); 2974 EXPORT_SYMBOL(proc_dointvec_minmax); 2975 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2976 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2977 EXPORT_SYMBOL(proc_dostring); 2978 EXPORT_SYMBOL(proc_doulongvec_minmax); 2979 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2980 EXPORT_SYMBOL(register_sysctl_table); 2981 EXPORT_SYMBOL(register_sysctl_paths); 2982 EXPORT_SYMBOL(unregister_sysctl_table); 2983