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, 734 .extra1 = &zero, 735 .extra2 = &one, 736 }, 737 { 738 .procname = "watchdog_thresh", 739 .data = &watchdog_thresh, 740 .maxlen = sizeof(int), 741 .mode = 0644, 742 .proc_handler = proc_dowatchdog, 743 .extra1 = &neg_one, 744 .extra2 = &sixty, 745 }, 746 { 747 .procname = "softlockup_panic", 748 .data = &softlockup_panic, 749 .maxlen = sizeof(int), 750 .mode = 0644, 751 .proc_handler = proc_dointvec_minmax, 752 .extra1 = &zero, 753 .extra2 = &one, 754 }, 755 { 756 .procname = "nmi_watchdog", 757 .data = &watchdog_enabled, 758 .maxlen = sizeof (int), 759 .mode = 0644, 760 .proc_handler = proc_dowatchdog, 761 .extra1 = &zero, 762 .extra2 = &one, 763 }, 764 #endif 765 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 766 { 767 .procname = "unknown_nmi_panic", 768 .data = &unknown_nmi_panic, 769 .maxlen = sizeof (int), 770 .mode = 0644, 771 .proc_handler = proc_dointvec, 772 }, 773 #endif 774 #if defined(CONFIG_X86) 775 { 776 .procname = "panic_on_unrecovered_nmi", 777 .data = &panic_on_unrecovered_nmi, 778 .maxlen = sizeof(int), 779 .mode = 0644, 780 .proc_handler = proc_dointvec, 781 }, 782 { 783 .procname = "panic_on_io_nmi", 784 .data = &panic_on_io_nmi, 785 .maxlen = sizeof(int), 786 .mode = 0644, 787 .proc_handler = proc_dointvec, 788 }, 789 { 790 .procname = "bootloader_type", 791 .data = &bootloader_type, 792 .maxlen = sizeof (int), 793 .mode = 0444, 794 .proc_handler = proc_dointvec, 795 }, 796 { 797 .procname = "bootloader_version", 798 .data = &bootloader_version, 799 .maxlen = sizeof (int), 800 .mode = 0444, 801 .proc_handler = proc_dointvec, 802 }, 803 { 804 .procname = "kstack_depth_to_print", 805 .data = &kstack_depth_to_print, 806 .maxlen = sizeof(int), 807 .mode = 0644, 808 .proc_handler = proc_dointvec, 809 }, 810 { 811 .procname = "io_delay_type", 812 .data = &io_delay_type, 813 .maxlen = sizeof(int), 814 .mode = 0644, 815 .proc_handler = proc_dointvec, 816 }, 817 #endif 818 #if defined(CONFIG_MMU) 819 { 820 .procname = "randomize_va_space", 821 .data = &randomize_va_space, 822 .maxlen = sizeof(int), 823 .mode = 0644, 824 .proc_handler = proc_dointvec, 825 }, 826 #endif 827 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 828 { 829 .procname = "spin_retry", 830 .data = &spin_retry, 831 .maxlen = sizeof (int), 832 .mode = 0644, 833 .proc_handler = proc_dointvec, 834 }, 835 #endif 836 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 837 { 838 .procname = "acpi_video_flags", 839 .data = &acpi_realmode_flags, 840 .maxlen = sizeof (unsigned long), 841 .mode = 0644, 842 .proc_handler = proc_doulongvec_minmax, 843 }, 844 #endif 845 #ifdef CONFIG_IA64 846 { 847 .procname = "ignore-unaligned-usertrap", 848 .data = &no_unaligned_warning, 849 .maxlen = sizeof (int), 850 .mode = 0644, 851 .proc_handler = proc_dointvec, 852 }, 853 { 854 .procname = "unaligned-dump-stack", 855 .data = &unaligned_dump_stack, 856 .maxlen = sizeof (int), 857 .mode = 0644, 858 .proc_handler = proc_dointvec, 859 }, 860 #endif 861 #ifdef CONFIG_DETECT_HUNG_TASK 862 { 863 .procname = "hung_task_panic", 864 .data = &sysctl_hung_task_panic, 865 .maxlen = sizeof(int), 866 .mode = 0644, 867 .proc_handler = proc_dointvec_minmax, 868 .extra1 = &zero, 869 .extra2 = &one, 870 }, 871 { 872 .procname = "hung_task_check_count", 873 .data = &sysctl_hung_task_check_count, 874 .maxlen = sizeof(unsigned long), 875 .mode = 0644, 876 .proc_handler = proc_doulongvec_minmax, 877 }, 878 { 879 .procname = "hung_task_timeout_secs", 880 .data = &sysctl_hung_task_timeout_secs, 881 .maxlen = sizeof(unsigned long), 882 .mode = 0644, 883 .proc_handler = proc_dohung_task_timeout_secs, 884 }, 885 { 886 .procname = "hung_task_warnings", 887 .data = &sysctl_hung_task_warnings, 888 .maxlen = sizeof(unsigned long), 889 .mode = 0644, 890 .proc_handler = proc_doulongvec_minmax, 891 }, 892 #endif 893 #ifdef CONFIG_COMPAT 894 { 895 .procname = "compat-log", 896 .data = &compat_log, 897 .maxlen = sizeof (int), 898 .mode = 0644, 899 .proc_handler = proc_dointvec, 900 }, 901 #endif 902 #ifdef CONFIG_RT_MUTEXES 903 { 904 .procname = "max_lock_depth", 905 .data = &max_lock_depth, 906 .maxlen = sizeof(int), 907 .mode = 0644, 908 .proc_handler = proc_dointvec, 909 }, 910 #endif 911 { 912 .procname = "poweroff_cmd", 913 .data = &poweroff_cmd, 914 .maxlen = POWEROFF_CMD_PATH_LEN, 915 .mode = 0644, 916 .proc_handler = proc_dostring, 917 }, 918 #ifdef CONFIG_KEYS 919 { 920 .procname = "keys", 921 .mode = 0555, 922 .child = key_sysctls, 923 }, 924 #endif 925 #ifdef CONFIG_RCU_TORTURE_TEST 926 { 927 .procname = "rcutorture_runnable", 928 .data = &rcutorture_runnable, 929 .maxlen = sizeof(int), 930 .mode = 0644, 931 .proc_handler = proc_dointvec, 932 }, 933 #endif 934 #ifdef CONFIG_PERF_EVENTS 935 { 936 .procname = "perf_event_paranoid", 937 .data = &sysctl_perf_event_paranoid, 938 .maxlen = sizeof(sysctl_perf_event_paranoid), 939 .mode = 0644, 940 .proc_handler = proc_dointvec, 941 }, 942 { 943 .procname = "perf_event_mlock_kb", 944 .data = &sysctl_perf_event_mlock, 945 .maxlen = sizeof(sysctl_perf_event_mlock), 946 .mode = 0644, 947 .proc_handler = proc_dointvec, 948 }, 949 { 950 .procname = "perf_event_max_sample_rate", 951 .data = &sysctl_perf_event_sample_rate, 952 .maxlen = sizeof(sysctl_perf_event_sample_rate), 953 .mode = 0644, 954 .proc_handler = perf_proc_update_handler, 955 }, 956 #endif 957 #ifdef CONFIG_KMEMCHECK 958 { 959 .procname = "kmemcheck", 960 .data = &kmemcheck_enabled, 961 .maxlen = sizeof(int), 962 .mode = 0644, 963 .proc_handler = proc_dointvec, 964 }, 965 #endif 966 #ifdef CONFIG_BLOCK 967 { 968 .procname = "blk_iopoll", 969 .data = &blk_iopoll_enabled, 970 .maxlen = sizeof(int), 971 .mode = 0644, 972 .proc_handler = proc_dointvec, 973 }, 974 #endif 975 { } 976 }; 977 978 static struct ctl_table vm_table[] = { 979 { 980 .procname = "overcommit_memory", 981 .data = &sysctl_overcommit_memory, 982 .maxlen = sizeof(sysctl_overcommit_memory), 983 .mode = 0644, 984 .proc_handler = proc_dointvec_minmax, 985 .extra1 = &zero, 986 .extra2 = &two, 987 }, 988 { 989 .procname = "panic_on_oom", 990 .data = &sysctl_panic_on_oom, 991 .maxlen = sizeof(sysctl_panic_on_oom), 992 .mode = 0644, 993 .proc_handler = proc_dointvec_minmax, 994 .extra1 = &zero, 995 .extra2 = &two, 996 }, 997 { 998 .procname = "oom_kill_allocating_task", 999 .data = &sysctl_oom_kill_allocating_task, 1000 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1001 .mode = 0644, 1002 .proc_handler = proc_dointvec, 1003 }, 1004 { 1005 .procname = "oom_dump_tasks", 1006 .data = &sysctl_oom_dump_tasks, 1007 .maxlen = sizeof(sysctl_oom_dump_tasks), 1008 .mode = 0644, 1009 .proc_handler = proc_dointvec, 1010 }, 1011 { 1012 .procname = "overcommit_ratio", 1013 .data = &sysctl_overcommit_ratio, 1014 .maxlen = sizeof(sysctl_overcommit_ratio), 1015 .mode = 0644, 1016 .proc_handler = proc_dointvec, 1017 }, 1018 { 1019 .procname = "page-cluster", 1020 .data = &page_cluster, 1021 .maxlen = sizeof(int), 1022 .mode = 0644, 1023 .proc_handler = proc_dointvec_minmax, 1024 .extra1 = &zero, 1025 }, 1026 { 1027 .procname = "dirty_background_ratio", 1028 .data = &dirty_background_ratio, 1029 .maxlen = sizeof(dirty_background_ratio), 1030 .mode = 0644, 1031 .proc_handler = dirty_background_ratio_handler, 1032 .extra1 = &zero, 1033 .extra2 = &one_hundred, 1034 }, 1035 { 1036 .procname = "dirty_background_bytes", 1037 .data = &dirty_background_bytes, 1038 .maxlen = sizeof(dirty_background_bytes), 1039 .mode = 0644, 1040 .proc_handler = dirty_background_bytes_handler, 1041 .extra1 = &one_ul, 1042 }, 1043 { 1044 .procname = "dirty_ratio", 1045 .data = &vm_dirty_ratio, 1046 .maxlen = sizeof(vm_dirty_ratio), 1047 .mode = 0644, 1048 .proc_handler = dirty_ratio_handler, 1049 .extra1 = &zero, 1050 .extra2 = &one_hundred, 1051 }, 1052 { 1053 .procname = "dirty_bytes", 1054 .data = &vm_dirty_bytes, 1055 .maxlen = sizeof(vm_dirty_bytes), 1056 .mode = 0644, 1057 .proc_handler = dirty_bytes_handler, 1058 .extra1 = &dirty_bytes_min, 1059 }, 1060 { 1061 .procname = "dirty_writeback_centisecs", 1062 .data = &dirty_writeback_interval, 1063 .maxlen = sizeof(dirty_writeback_interval), 1064 .mode = 0644, 1065 .proc_handler = dirty_writeback_centisecs_handler, 1066 }, 1067 { 1068 .procname = "dirty_expire_centisecs", 1069 .data = &dirty_expire_interval, 1070 .maxlen = sizeof(dirty_expire_interval), 1071 .mode = 0644, 1072 .proc_handler = proc_dointvec_minmax, 1073 .extra1 = &zero, 1074 }, 1075 { 1076 .procname = "nr_pdflush_threads", 1077 .data = &nr_pdflush_threads, 1078 .maxlen = sizeof nr_pdflush_threads, 1079 .mode = 0444 /* read-only*/, 1080 .proc_handler = proc_dointvec, 1081 }, 1082 { 1083 .procname = "swappiness", 1084 .data = &vm_swappiness, 1085 .maxlen = sizeof(vm_swappiness), 1086 .mode = 0644, 1087 .proc_handler = proc_dointvec_minmax, 1088 .extra1 = &zero, 1089 .extra2 = &one_hundred, 1090 }, 1091 #ifdef CONFIG_HUGETLB_PAGE 1092 { 1093 .procname = "nr_hugepages", 1094 .data = NULL, 1095 .maxlen = sizeof(unsigned long), 1096 .mode = 0644, 1097 .proc_handler = hugetlb_sysctl_handler, 1098 .extra1 = (void *)&hugetlb_zero, 1099 .extra2 = (void *)&hugetlb_infinity, 1100 }, 1101 #ifdef CONFIG_NUMA 1102 { 1103 .procname = "nr_hugepages_mempolicy", 1104 .data = NULL, 1105 .maxlen = sizeof(unsigned long), 1106 .mode = 0644, 1107 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1108 .extra1 = (void *)&hugetlb_zero, 1109 .extra2 = (void *)&hugetlb_infinity, 1110 }, 1111 #endif 1112 { 1113 .procname = "hugetlb_shm_group", 1114 .data = &sysctl_hugetlb_shm_group, 1115 .maxlen = sizeof(gid_t), 1116 .mode = 0644, 1117 .proc_handler = proc_dointvec, 1118 }, 1119 { 1120 .procname = "hugepages_treat_as_movable", 1121 .data = &hugepages_treat_as_movable, 1122 .maxlen = sizeof(int), 1123 .mode = 0644, 1124 .proc_handler = hugetlb_treat_movable_handler, 1125 }, 1126 { 1127 .procname = "nr_overcommit_hugepages", 1128 .data = NULL, 1129 .maxlen = sizeof(unsigned long), 1130 .mode = 0644, 1131 .proc_handler = hugetlb_overcommit_handler, 1132 .extra1 = (void *)&hugetlb_zero, 1133 .extra2 = (void *)&hugetlb_infinity, 1134 }, 1135 #endif 1136 { 1137 .procname = "lowmem_reserve_ratio", 1138 .data = &sysctl_lowmem_reserve_ratio, 1139 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1140 .mode = 0644, 1141 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1142 }, 1143 { 1144 .procname = "drop_caches", 1145 .data = &sysctl_drop_caches, 1146 .maxlen = sizeof(int), 1147 .mode = 0644, 1148 .proc_handler = drop_caches_sysctl_handler, 1149 .extra1 = &one, 1150 .extra2 = &three, 1151 }, 1152 #ifdef CONFIG_COMPACTION 1153 { 1154 .procname = "compact_memory", 1155 .data = &sysctl_compact_memory, 1156 .maxlen = sizeof(int), 1157 .mode = 0200, 1158 .proc_handler = sysctl_compaction_handler, 1159 }, 1160 { 1161 .procname = "extfrag_threshold", 1162 .data = &sysctl_extfrag_threshold, 1163 .maxlen = sizeof(int), 1164 .mode = 0644, 1165 .proc_handler = sysctl_extfrag_handler, 1166 .extra1 = &min_extfrag_threshold, 1167 .extra2 = &max_extfrag_threshold, 1168 }, 1169 1170 #endif /* CONFIG_COMPACTION */ 1171 { 1172 .procname = "min_free_kbytes", 1173 .data = &min_free_kbytes, 1174 .maxlen = sizeof(min_free_kbytes), 1175 .mode = 0644, 1176 .proc_handler = min_free_kbytes_sysctl_handler, 1177 .extra1 = &zero, 1178 }, 1179 { 1180 .procname = "percpu_pagelist_fraction", 1181 .data = &percpu_pagelist_fraction, 1182 .maxlen = sizeof(percpu_pagelist_fraction), 1183 .mode = 0644, 1184 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1185 .extra1 = &min_percpu_pagelist_fract, 1186 }, 1187 #ifdef CONFIG_MMU 1188 { 1189 .procname = "max_map_count", 1190 .data = &sysctl_max_map_count, 1191 .maxlen = sizeof(sysctl_max_map_count), 1192 .mode = 0644, 1193 .proc_handler = proc_dointvec_minmax, 1194 .extra1 = &zero, 1195 }, 1196 #else 1197 { 1198 .procname = "nr_trim_pages", 1199 .data = &sysctl_nr_trim_pages, 1200 .maxlen = sizeof(sysctl_nr_trim_pages), 1201 .mode = 0644, 1202 .proc_handler = proc_dointvec_minmax, 1203 .extra1 = &zero, 1204 }, 1205 #endif 1206 { 1207 .procname = "laptop_mode", 1208 .data = &laptop_mode, 1209 .maxlen = sizeof(laptop_mode), 1210 .mode = 0644, 1211 .proc_handler = proc_dointvec_jiffies, 1212 }, 1213 { 1214 .procname = "block_dump", 1215 .data = &block_dump, 1216 .maxlen = sizeof(block_dump), 1217 .mode = 0644, 1218 .proc_handler = proc_dointvec, 1219 .extra1 = &zero, 1220 }, 1221 { 1222 .procname = "vfs_cache_pressure", 1223 .data = &sysctl_vfs_cache_pressure, 1224 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1225 .mode = 0644, 1226 .proc_handler = proc_dointvec, 1227 .extra1 = &zero, 1228 }, 1229 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1230 { 1231 .procname = "legacy_va_layout", 1232 .data = &sysctl_legacy_va_layout, 1233 .maxlen = sizeof(sysctl_legacy_va_layout), 1234 .mode = 0644, 1235 .proc_handler = proc_dointvec, 1236 .extra1 = &zero, 1237 }, 1238 #endif 1239 #ifdef CONFIG_NUMA 1240 { 1241 .procname = "zone_reclaim_mode", 1242 .data = &zone_reclaim_mode, 1243 .maxlen = sizeof(zone_reclaim_mode), 1244 .mode = 0644, 1245 .proc_handler = proc_dointvec, 1246 .extra1 = &zero, 1247 }, 1248 { 1249 .procname = "min_unmapped_ratio", 1250 .data = &sysctl_min_unmapped_ratio, 1251 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1252 .mode = 0644, 1253 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1254 .extra1 = &zero, 1255 .extra2 = &one_hundred, 1256 }, 1257 { 1258 .procname = "min_slab_ratio", 1259 .data = &sysctl_min_slab_ratio, 1260 .maxlen = sizeof(sysctl_min_slab_ratio), 1261 .mode = 0644, 1262 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1263 .extra1 = &zero, 1264 .extra2 = &one_hundred, 1265 }, 1266 #endif 1267 #ifdef CONFIG_SMP 1268 { 1269 .procname = "stat_interval", 1270 .data = &sysctl_stat_interval, 1271 .maxlen = sizeof(sysctl_stat_interval), 1272 .mode = 0644, 1273 .proc_handler = proc_dointvec_jiffies, 1274 }, 1275 #endif 1276 #ifdef CONFIG_MMU 1277 { 1278 .procname = "mmap_min_addr", 1279 .data = &dac_mmap_min_addr, 1280 .maxlen = sizeof(unsigned long), 1281 .mode = 0644, 1282 .proc_handler = mmap_min_addr_handler, 1283 }, 1284 #endif 1285 #ifdef CONFIG_NUMA 1286 { 1287 .procname = "numa_zonelist_order", 1288 .data = &numa_zonelist_order, 1289 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1290 .mode = 0644, 1291 .proc_handler = numa_zonelist_order_handler, 1292 }, 1293 #endif 1294 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1295 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1296 { 1297 .procname = "vdso_enabled", 1298 .data = &vdso_enabled, 1299 .maxlen = sizeof(vdso_enabled), 1300 .mode = 0644, 1301 .proc_handler = proc_dointvec, 1302 .extra1 = &zero, 1303 }, 1304 #endif 1305 #ifdef CONFIG_HIGHMEM 1306 { 1307 .procname = "highmem_is_dirtyable", 1308 .data = &vm_highmem_is_dirtyable, 1309 .maxlen = sizeof(vm_highmem_is_dirtyable), 1310 .mode = 0644, 1311 .proc_handler = proc_dointvec_minmax, 1312 .extra1 = &zero, 1313 .extra2 = &one, 1314 }, 1315 #endif 1316 { 1317 .procname = "scan_unevictable_pages", 1318 .data = &scan_unevictable_pages, 1319 .maxlen = sizeof(scan_unevictable_pages), 1320 .mode = 0644, 1321 .proc_handler = scan_unevictable_handler, 1322 }, 1323 #ifdef CONFIG_MEMORY_FAILURE 1324 { 1325 .procname = "memory_failure_early_kill", 1326 .data = &sysctl_memory_failure_early_kill, 1327 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1328 .mode = 0644, 1329 .proc_handler = proc_dointvec_minmax, 1330 .extra1 = &zero, 1331 .extra2 = &one, 1332 }, 1333 { 1334 .procname = "memory_failure_recovery", 1335 .data = &sysctl_memory_failure_recovery, 1336 .maxlen = sizeof(sysctl_memory_failure_recovery), 1337 .mode = 0644, 1338 .proc_handler = proc_dointvec_minmax, 1339 .extra1 = &zero, 1340 .extra2 = &one, 1341 }, 1342 #endif 1343 { } 1344 }; 1345 1346 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1347 static struct ctl_table binfmt_misc_table[] = { 1348 { } 1349 }; 1350 #endif 1351 1352 static struct ctl_table fs_table[] = { 1353 { 1354 .procname = "inode-nr", 1355 .data = &inodes_stat, 1356 .maxlen = 2*sizeof(int), 1357 .mode = 0444, 1358 .proc_handler = proc_nr_inodes, 1359 }, 1360 { 1361 .procname = "inode-state", 1362 .data = &inodes_stat, 1363 .maxlen = 7*sizeof(int), 1364 .mode = 0444, 1365 .proc_handler = proc_nr_inodes, 1366 }, 1367 { 1368 .procname = "file-nr", 1369 .data = &files_stat, 1370 .maxlen = sizeof(files_stat), 1371 .mode = 0444, 1372 .proc_handler = proc_nr_files, 1373 }, 1374 { 1375 .procname = "file-max", 1376 .data = &files_stat.max_files, 1377 .maxlen = sizeof(files_stat.max_files), 1378 .mode = 0644, 1379 .proc_handler = proc_doulongvec_minmax, 1380 }, 1381 { 1382 .procname = "nr_open", 1383 .data = &sysctl_nr_open, 1384 .maxlen = sizeof(int), 1385 .mode = 0644, 1386 .proc_handler = proc_dointvec_minmax, 1387 .extra1 = &sysctl_nr_open_min, 1388 .extra2 = &sysctl_nr_open_max, 1389 }, 1390 { 1391 .procname = "dentry-state", 1392 .data = &dentry_stat, 1393 .maxlen = 6*sizeof(int), 1394 .mode = 0444, 1395 .proc_handler = proc_nr_dentry, 1396 }, 1397 { 1398 .procname = "overflowuid", 1399 .data = &fs_overflowuid, 1400 .maxlen = sizeof(int), 1401 .mode = 0644, 1402 .proc_handler = proc_dointvec_minmax, 1403 .extra1 = &minolduid, 1404 .extra2 = &maxolduid, 1405 }, 1406 { 1407 .procname = "overflowgid", 1408 .data = &fs_overflowgid, 1409 .maxlen = sizeof(int), 1410 .mode = 0644, 1411 .proc_handler = proc_dointvec_minmax, 1412 .extra1 = &minolduid, 1413 .extra2 = &maxolduid, 1414 }, 1415 #ifdef CONFIG_FILE_LOCKING 1416 { 1417 .procname = "leases-enable", 1418 .data = &leases_enable, 1419 .maxlen = sizeof(int), 1420 .mode = 0644, 1421 .proc_handler = proc_dointvec, 1422 }, 1423 #endif 1424 #ifdef CONFIG_DNOTIFY 1425 { 1426 .procname = "dir-notify-enable", 1427 .data = &dir_notify_enable, 1428 .maxlen = sizeof(int), 1429 .mode = 0644, 1430 .proc_handler = proc_dointvec, 1431 }, 1432 #endif 1433 #ifdef CONFIG_MMU 1434 #ifdef CONFIG_FILE_LOCKING 1435 { 1436 .procname = "lease-break-time", 1437 .data = &lease_break_time, 1438 .maxlen = sizeof(int), 1439 .mode = 0644, 1440 .proc_handler = proc_dointvec, 1441 }, 1442 #endif 1443 #ifdef CONFIG_AIO 1444 { 1445 .procname = "aio-nr", 1446 .data = &aio_nr, 1447 .maxlen = sizeof(aio_nr), 1448 .mode = 0444, 1449 .proc_handler = proc_doulongvec_minmax, 1450 }, 1451 { 1452 .procname = "aio-max-nr", 1453 .data = &aio_max_nr, 1454 .maxlen = sizeof(aio_max_nr), 1455 .mode = 0644, 1456 .proc_handler = proc_doulongvec_minmax, 1457 }, 1458 #endif /* CONFIG_AIO */ 1459 #ifdef CONFIG_INOTIFY_USER 1460 { 1461 .procname = "inotify", 1462 .mode = 0555, 1463 .child = inotify_table, 1464 }, 1465 #endif 1466 #ifdef CONFIG_EPOLL 1467 { 1468 .procname = "epoll", 1469 .mode = 0555, 1470 .child = epoll_table, 1471 }, 1472 #endif 1473 #endif 1474 { 1475 .procname = "suid_dumpable", 1476 .data = &suid_dumpable, 1477 .maxlen = sizeof(int), 1478 .mode = 0644, 1479 .proc_handler = proc_dointvec_minmax, 1480 .extra1 = &zero, 1481 .extra2 = &two, 1482 }, 1483 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1484 { 1485 .procname = "binfmt_misc", 1486 .mode = 0555, 1487 .child = binfmt_misc_table, 1488 }, 1489 #endif 1490 { 1491 .procname = "pipe-max-size", 1492 .data = &pipe_max_size, 1493 .maxlen = sizeof(int), 1494 .mode = 0644, 1495 .proc_handler = &pipe_proc_fn, 1496 .extra1 = &pipe_min_size, 1497 }, 1498 { } 1499 }; 1500 1501 static struct ctl_table debug_table[] = { 1502 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1503 defined(CONFIG_S390) 1504 { 1505 .procname = "exception-trace", 1506 .data = &show_unhandled_signals, 1507 .maxlen = sizeof(int), 1508 .mode = 0644, 1509 .proc_handler = proc_dointvec 1510 }, 1511 #endif 1512 #if defined(CONFIG_OPTPROBES) 1513 { 1514 .procname = "kprobes-optimization", 1515 .data = &sysctl_kprobes_optimization, 1516 .maxlen = sizeof(int), 1517 .mode = 0644, 1518 .proc_handler = proc_kprobes_optimization_handler, 1519 .extra1 = &zero, 1520 .extra2 = &one, 1521 }, 1522 #endif 1523 { } 1524 }; 1525 1526 static struct ctl_table dev_table[] = { 1527 { } 1528 }; 1529 1530 static DEFINE_SPINLOCK(sysctl_lock); 1531 1532 /* called under sysctl_lock */ 1533 static int use_table(struct ctl_table_header *p) 1534 { 1535 if (unlikely(p->unregistering)) 1536 return 0; 1537 p->used++; 1538 return 1; 1539 } 1540 1541 /* called under sysctl_lock */ 1542 static void unuse_table(struct ctl_table_header *p) 1543 { 1544 if (!--p->used) 1545 if (unlikely(p->unregistering)) 1546 complete(p->unregistering); 1547 } 1548 1549 /* called under sysctl_lock, will reacquire if has to wait */ 1550 static void start_unregistering(struct ctl_table_header *p) 1551 { 1552 /* 1553 * if p->used is 0, nobody will ever touch that entry again; 1554 * we'll eliminate all paths to it before dropping sysctl_lock 1555 */ 1556 if (unlikely(p->used)) { 1557 struct completion wait; 1558 init_completion(&wait); 1559 p->unregistering = &wait; 1560 spin_unlock(&sysctl_lock); 1561 wait_for_completion(&wait); 1562 spin_lock(&sysctl_lock); 1563 } else { 1564 /* anything non-NULL; we'll never dereference it */ 1565 p->unregistering = ERR_PTR(-EINVAL); 1566 } 1567 /* 1568 * do not remove from the list until nobody holds it; walking the 1569 * list in do_sysctl() relies on that. 1570 */ 1571 list_del_init(&p->ctl_entry); 1572 } 1573 1574 void sysctl_head_get(struct ctl_table_header *head) 1575 { 1576 spin_lock(&sysctl_lock); 1577 head->count++; 1578 spin_unlock(&sysctl_lock); 1579 } 1580 1581 static void free_head(struct rcu_head *rcu) 1582 { 1583 kfree(container_of(rcu, struct ctl_table_header, rcu)); 1584 } 1585 1586 void sysctl_head_put(struct ctl_table_header *head) 1587 { 1588 spin_lock(&sysctl_lock); 1589 if (!--head->count) 1590 call_rcu(&head->rcu, free_head); 1591 spin_unlock(&sysctl_lock); 1592 } 1593 1594 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1595 { 1596 if (!head) 1597 BUG(); 1598 spin_lock(&sysctl_lock); 1599 if (!use_table(head)) 1600 head = ERR_PTR(-ENOENT); 1601 spin_unlock(&sysctl_lock); 1602 return head; 1603 } 1604 1605 void sysctl_head_finish(struct ctl_table_header *head) 1606 { 1607 if (!head) 1608 return; 1609 spin_lock(&sysctl_lock); 1610 unuse_table(head); 1611 spin_unlock(&sysctl_lock); 1612 } 1613 1614 static struct ctl_table_set * 1615 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1616 { 1617 struct ctl_table_set *set = &root->default_set; 1618 if (root->lookup) 1619 set = root->lookup(root, namespaces); 1620 return set; 1621 } 1622 1623 static struct list_head * 1624 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1625 { 1626 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1627 return &set->list; 1628 } 1629 1630 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1631 struct ctl_table_header *prev) 1632 { 1633 struct ctl_table_root *root; 1634 struct list_head *header_list; 1635 struct ctl_table_header *head; 1636 struct list_head *tmp; 1637 1638 spin_lock(&sysctl_lock); 1639 if (prev) { 1640 head = prev; 1641 tmp = &prev->ctl_entry; 1642 unuse_table(prev); 1643 goto next; 1644 } 1645 tmp = &root_table_header.ctl_entry; 1646 for (;;) { 1647 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1648 1649 if (!use_table(head)) 1650 goto next; 1651 spin_unlock(&sysctl_lock); 1652 return head; 1653 next: 1654 root = head->root; 1655 tmp = tmp->next; 1656 header_list = lookup_header_list(root, namespaces); 1657 if (tmp != header_list) 1658 continue; 1659 1660 do { 1661 root = list_entry(root->root_list.next, 1662 struct ctl_table_root, root_list); 1663 if (root == &sysctl_table_root) 1664 goto out; 1665 header_list = lookup_header_list(root, namespaces); 1666 } while (list_empty(header_list)); 1667 tmp = header_list->next; 1668 } 1669 out: 1670 spin_unlock(&sysctl_lock); 1671 return NULL; 1672 } 1673 1674 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1675 { 1676 return __sysctl_head_next(current->nsproxy, prev); 1677 } 1678 1679 void register_sysctl_root(struct ctl_table_root *root) 1680 { 1681 spin_lock(&sysctl_lock); 1682 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1683 spin_unlock(&sysctl_lock); 1684 } 1685 1686 /* 1687 * sysctl_perm does NOT grant the superuser all rights automatically, because 1688 * some sysctl variables are readonly even to root. 1689 */ 1690 1691 static int test_perm(int mode, int op) 1692 { 1693 if (!current_euid()) 1694 mode >>= 6; 1695 else if (in_egroup_p(0)) 1696 mode >>= 3; 1697 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1698 return 0; 1699 return -EACCES; 1700 } 1701 1702 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1703 { 1704 int mode; 1705 1706 if (root->permissions) 1707 mode = root->permissions(root, current->nsproxy, table); 1708 else 1709 mode = table->mode; 1710 1711 return test_perm(mode, op); 1712 } 1713 1714 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1715 { 1716 for (; table->procname; table++) { 1717 table->parent = parent; 1718 if (table->child) 1719 sysctl_set_parent(table, table->child); 1720 } 1721 } 1722 1723 static __init int sysctl_init(void) 1724 { 1725 sysctl_set_parent(NULL, root_table); 1726 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1727 sysctl_check_table(current->nsproxy, root_table); 1728 #endif 1729 return 0; 1730 } 1731 1732 core_initcall(sysctl_init); 1733 1734 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1735 struct ctl_table *table) 1736 { 1737 struct ctl_table *p; 1738 const char *s = branch->procname; 1739 1740 /* branch should have named subdirectory as its first element */ 1741 if (!s || !branch->child) 1742 return NULL; 1743 1744 /* ... and nothing else */ 1745 if (branch[1].procname) 1746 return NULL; 1747 1748 /* table should contain subdirectory with the same name */ 1749 for (p = table; p->procname; p++) { 1750 if (!p->child) 1751 continue; 1752 if (p->procname && strcmp(p->procname, s) == 0) 1753 return p; 1754 } 1755 return NULL; 1756 } 1757 1758 /* see if attaching q to p would be an improvement */ 1759 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1760 { 1761 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1762 struct ctl_table *next; 1763 int is_better = 0; 1764 int not_in_parent = !p->attached_by; 1765 1766 while ((next = is_branch_in(by, to)) != NULL) { 1767 if (by == q->attached_by) 1768 is_better = 1; 1769 if (to == p->attached_by) 1770 not_in_parent = 1; 1771 by = by->child; 1772 to = next->child; 1773 } 1774 1775 if (is_better && not_in_parent) { 1776 q->attached_by = by; 1777 q->attached_to = to; 1778 q->parent = p; 1779 } 1780 } 1781 1782 /** 1783 * __register_sysctl_paths - register a sysctl hierarchy 1784 * @root: List of sysctl headers to register on 1785 * @namespaces: Data to compute which lists of sysctl entries are visible 1786 * @path: The path to the directory the sysctl table is in. 1787 * @table: the top-level table structure 1788 * 1789 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1790 * array. A completely 0 filled entry terminates the table. 1791 * 1792 * The members of the &struct ctl_table structure are used as follows: 1793 * 1794 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1795 * enter a sysctl file 1796 * 1797 * data - a pointer to data for use by proc_handler 1798 * 1799 * maxlen - the maximum size in bytes of the data 1800 * 1801 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1802 * 1803 * child - a pointer to the child sysctl table if this entry is a directory, or 1804 * %NULL. 1805 * 1806 * proc_handler - the text handler routine (described below) 1807 * 1808 * de - for internal use by the sysctl routines 1809 * 1810 * extra1, extra2 - extra pointers usable by the proc handler routines 1811 * 1812 * Leaf nodes in the sysctl tree will be represented by a single file 1813 * under /proc; non-leaf nodes will be represented by directories. 1814 * 1815 * sysctl(2) can automatically manage read and write requests through 1816 * the sysctl table. The data and maxlen fields of the ctl_table 1817 * struct enable minimal validation of the values being written to be 1818 * performed, and the mode field allows minimal authentication. 1819 * 1820 * There must be a proc_handler routine for any terminal nodes 1821 * mirrored under /proc/sys (non-terminals are handled by a built-in 1822 * directory handler). Several default handlers are available to 1823 * cover common cases - 1824 * 1825 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1826 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1827 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1828 * 1829 * It is the handler's job to read the input buffer from user memory 1830 * and process it. The handler should return 0 on success. 1831 * 1832 * This routine returns %NULL on a failure to register, and a pointer 1833 * to the table header on success. 1834 */ 1835 struct ctl_table_header *__register_sysctl_paths( 1836 struct ctl_table_root *root, 1837 struct nsproxy *namespaces, 1838 const struct ctl_path *path, struct ctl_table *table) 1839 { 1840 struct ctl_table_header *header; 1841 struct ctl_table *new, **prevp; 1842 unsigned int n, npath; 1843 struct ctl_table_set *set; 1844 1845 /* Count the path components */ 1846 for (npath = 0; path[npath].procname; ++npath) 1847 ; 1848 1849 /* 1850 * For each path component, allocate a 2-element ctl_table array. 1851 * The first array element will be filled with the sysctl entry 1852 * for this, the second will be the sentinel (procname == 0). 1853 * 1854 * We allocate everything in one go so that we don't have to 1855 * worry about freeing additional memory in unregister_sysctl_table. 1856 */ 1857 header = kzalloc(sizeof(struct ctl_table_header) + 1858 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1859 if (!header) 1860 return NULL; 1861 1862 new = (struct ctl_table *) (header + 1); 1863 1864 /* Now connect the dots */ 1865 prevp = &header->ctl_table; 1866 for (n = 0; n < npath; ++n, ++path) { 1867 /* Copy the procname */ 1868 new->procname = path->procname; 1869 new->mode = 0555; 1870 1871 *prevp = new; 1872 prevp = &new->child; 1873 1874 new += 2; 1875 } 1876 *prevp = table; 1877 header->ctl_table_arg = table; 1878 1879 INIT_LIST_HEAD(&header->ctl_entry); 1880 header->used = 0; 1881 header->unregistering = NULL; 1882 header->root = root; 1883 sysctl_set_parent(NULL, header->ctl_table); 1884 header->count = 1; 1885 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1886 if (sysctl_check_table(namespaces, header->ctl_table)) { 1887 kfree(header); 1888 return NULL; 1889 } 1890 #endif 1891 spin_lock(&sysctl_lock); 1892 header->set = lookup_header_set(root, namespaces); 1893 header->attached_by = header->ctl_table; 1894 header->attached_to = root_table; 1895 header->parent = &root_table_header; 1896 for (set = header->set; set; set = set->parent) { 1897 struct ctl_table_header *p; 1898 list_for_each_entry(p, &set->list, ctl_entry) { 1899 if (p->unregistering) 1900 continue; 1901 try_attach(p, header); 1902 } 1903 } 1904 header->parent->count++; 1905 list_add_tail(&header->ctl_entry, &header->set->list); 1906 spin_unlock(&sysctl_lock); 1907 1908 return header; 1909 } 1910 1911 /** 1912 * register_sysctl_table_path - register a sysctl table hierarchy 1913 * @path: The path to the directory the sysctl table is in. 1914 * @table: the top-level table structure 1915 * 1916 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1917 * array. A completely 0 filled entry terminates the table. 1918 * 1919 * See __register_sysctl_paths for more details. 1920 */ 1921 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1922 struct ctl_table *table) 1923 { 1924 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1925 path, table); 1926 } 1927 1928 /** 1929 * register_sysctl_table - register a sysctl table hierarchy 1930 * @table: the top-level table structure 1931 * 1932 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1933 * array. A completely 0 filled entry terminates the table. 1934 * 1935 * See register_sysctl_paths for more details. 1936 */ 1937 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1938 { 1939 static const struct ctl_path null_path[] = { {} }; 1940 1941 return register_sysctl_paths(null_path, table); 1942 } 1943 1944 /** 1945 * unregister_sysctl_table - unregister a sysctl table hierarchy 1946 * @header: the header returned from register_sysctl_table 1947 * 1948 * Unregisters the sysctl table and all children. proc entries may not 1949 * actually be removed until they are no longer used by anyone. 1950 */ 1951 void unregister_sysctl_table(struct ctl_table_header * header) 1952 { 1953 might_sleep(); 1954 1955 if (header == NULL) 1956 return; 1957 1958 spin_lock(&sysctl_lock); 1959 start_unregistering(header); 1960 if (!--header->parent->count) { 1961 WARN_ON(1); 1962 call_rcu(&header->parent->rcu, free_head); 1963 } 1964 if (!--header->count) 1965 call_rcu(&header->rcu, free_head); 1966 spin_unlock(&sysctl_lock); 1967 } 1968 1969 int sysctl_is_seen(struct ctl_table_header *p) 1970 { 1971 struct ctl_table_set *set = p->set; 1972 int res; 1973 spin_lock(&sysctl_lock); 1974 if (p->unregistering) 1975 res = 0; 1976 else if (!set->is_seen) 1977 res = 1; 1978 else 1979 res = set->is_seen(set); 1980 spin_unlock(&sysctl_lock); 1981 return res; 1982 } 1983 1984 void setup_sysctl_set(struct ctl_table_set *p, 1985 struct ctl_table_set *parent, 1986 int (*is_seen)(struct ctl_table_set *)) 1987 { 1988 INIT_LIST_HEAD(&p->list); 1989 p->parent = parent ? parent : &sysctl_table_root.default_set; 1990 p->is_seen = is_seen; 1991 } 1992 1993 #else /* !CONFIG_SYSCTL */ 1994 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1995 { 1996 return NULL; 1997 } 1998 1999 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2000 struct ctl_table *table) 2001 { 2002 return NULL; 2003 } 2004 2005 void unregister_sysctl_table(struct ctl_table_header * table) 2006 { 2007 } 2008 2009 void setup_sysctl_set(struct ctl_table_set *p, 2010 struct ctl_table_set *parent, 2011 int (*is_seen)(struct ctl_table_set *)) 2012 { 2013 } 2014 2015 void sysctl_head_put(struct ctl_table_header *head) 2016 { 2017 } 2018 2019 #endif /* CONFIG_SYSCTL */ 2020 2021 /* 2022 * /proc/sys support 2023 */ 2024 2025 #ifdef CONFIG_PROC_SYSCTL 2026 2027 static int _proc_do_string(void* data, int maxlen, int write, 2028 void __user *buffer, 2029 size_t *lenp, loff_t *ppos) 2030 { 2031 size_t len; 2032 char __user *p; 2033 char c; 2034 2035 if (!data || !maxlen || !*lenp) { 2036 *lenp = 0; 2037 return 0; 2038 } 2039 2040 if (write) { 2041 len = 0; 2042 p = buffer; 2043 while (len < *lenp) { 2044 if (get_user(c, p++)) 2045 return -EFAULT; 2046 if (c == 0 || c == '\n') 2047 break; 2048 len++; 2049 } 2050 if (len >= maxlen) 2051 len = maxlen-1; 2052 if(copy_from_user(data, buffer, len)) 2053 return -EFAULT; 2054 ((char *) data)[len] = 0; 2055 *ppos += *lenp; 2056 } else { 2057 len = strlen(data); 2058 if (len > maxlen) 2059 len = maxlen; 2060 2061 if (*ppos > len) { 2062 *lenp = 0; 2063 return 0; 2064 } 2065 2066 data += *ppos; 2067 len -= *ppos; 2068 2069 if (len > *lenp) 2070 len = *lenp; 2071 if (len) 2072 if(copy_to_user(buffer, data, len)) 2073 return -EFAULT; 2074 if (len < *lenp) { 2075 if(put_user('\n', ((char __user *) buffer) + len)) 2076 return -EFAULT; 2077 len++; 2078 } 2079 *lenp = len; 2080 *ppos += len; 2081 } 2082 return 0; 2083 } 2084 2085 /** 2086 * proc_dostring - read a string sysctl 2087 * @table: the sysctl table 2088 * @write: %TRUE if this is a write to the sysctl file 2089 * @buffer: the user buffer 2090 * @lenp: the size of the user buffer 2091 * @ppos: file position 2092 * 2093 * Reads/writes a string from/to the user buffer. If the kernel 2094 * buffer provided is not large enough to hold the string, the 2095 * string is truncated. The copied string is %NULL-terminated. 2096 * If the string is being read by the user process, it is copied 2097 * and a newline '\n' is added. It is truncated if the buffer is 2098 * not large enough. 2099 * 2100 * Returns 0 on success. 2101 */ 2102 int proc_dostring(struct ctl_table *table, int write, 2103 void __user *buffer, size_t *lenp, loff_t *ppos) 2104 { 2105 return _proc_do_string(table->data, table->maxlen, write, 2106 buffer, lenp, ppos); 2107 } 2108 2109 static size_t proc_skip_spaces(char **buf) 2110 { 2111 size_t ret; 2112 char *tmp = skip_spaces(*buf); 2113 ret = tmp - *buf; 2114 *buf = tmp; 2115 return ret; 2116 } 2117 2118 static void proc_skip_char(char **buf, size_t *size, const char v) 2119 { 2120 while (*size) { 2121 if (**buf != v) 2122 break; 2123 (*size)--; 2124 (*buf)++; 2125 } 2126 } 2127 2128 #define TMPBUFLEN 22 2129 /** 2130 * proc_get_long - reads an ASCII formatted integer from a user buffer 2131 * 2132 * @buf: a kernel buffer 2133 * @size: size of the kernel buffer 2134 * @val: this is where the number will be stored 2135 * @neg: set to %TRUE if number is negative 2136 * @perm_tr: a vector which contains the allowed trailers 2137 * @perm_tr_len: size of the perm_tr vector 2138 * @tr: pointer to store the trailer character 2139 * 2140 * In case of success %0 is returned and @buf and @size are updated with 2141 * the amount of bytes read. If @tr is non-NULL and a trailing 2142 * character exists (size is non-zero after returning from this 2143 * function), @tr is updated with the trailing character. 2144 */ 2145 static int proc_get_long(char **buf, size_t *size, 2146 unsigned long *val, bool *neg, 2147 const char *perm_tr, unsigned perm_tr_len, char *tr) 2148 { 2149 int len; 2150 char *p, tmp[TMPBUFLEN]; 2151 2152 if (!*size) 2153 return -EINVAL; 2154 2155 len = *size; 2156 if (len > TMPBUFLEN - 1) 2157 len = TMPBUFLEN - 1; 2158 2159 memcpy(tmp, *buf, len); 2160 2161 tmp[len] = 0; 2162 p = tmp; 2163 if (*p == '-' && *size > 1) { 2164 *neg = true; 2165 p++; 2166 } else 2167 *neg = false; 2168 if (!isdigit(*p)) 2169 return -EINVAL; 2170 2171 *val = simple_strtoul(p, &p, 0); 2172 2173 len = p - tmp; 2174 2175 /* We don't know if the next char is whitespace thus we may accept 2176 * invalid integers (e.g. 1234...a) or two integers instead of one 2177 * (e.g. 123...1). So lets not allow such large numbers. */ 2178 if (len == TMPBUFLEN - 1) 2179 return -EINVAL; 2180 2181 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2182 return -EINVAL; 2183 2184 if (tr && (len < *size)) 2185 *tr = *p; 2186 2187 *buf += len; 2188 *size -= len; 2189 2190 return 0; 2191 } 2192 2193 /** 2194 * proc_put_long - converts an integer to a decimal ASCII formatted string 2195 * 2196 * @buf: the user buffer 2197 * @size: the size of the user buffer 2198 * @val: the integer to be converted 2199 * @neg: sign of the number, %TRUE for negative 2200 * 2201 * In case of success %0 is returned and @buf and @size are updated with 2202 * the amount of bytes written. 2203 */ 2204 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2205 bool neg) 2206 { 2207 int len; 2208 char tmp[TMPBUFLEN], *p = tmp; 2209 2210 sprintf(p, "%s%lu", neg ? "-" : "", val); 2211 len = strlen(tmp); 2212 if (len > *size) 2213 len = *size; 2214 if (copy_to_user(*buf, tmp, len)) 2215 return -EFAULT; 2216 *size -= len; 2217 *buf += len; 2218 return 0; 2219 } 2220 #undef TMPBUFLEN 2221 2222 static int proc_put_char(void __user **buf, size_t *size, char c) 2223 { 2224 if (*size) { 2225 char __user **buffer = (char __user **)buf; 2226 if (put_user(c, *buffer)) 2227 return -EFAULT; 2228 (*size)--, (*buffer)++; 2229 *buf = *buffer; 2230 } 2231 return 0; 2232 } 2233 2234 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2235 int *valp, 2236 int write, void *data) 2237 { 2238 if (write) { 2239 *valp = *negp ? -*lvalp : *lvalp; 2240 } else { 2241 int val = *valp; 2242 if (val < 0) { 2243 *negp = true; 2244 *lvalp = (unsigned long)-val; 2245 } else { 2246 *negp = false; 2247 *lvalp = (unsigned long)val; 2248 } 2249 } 2250 return 0; 2251 } 2252 2253 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2254 2255 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2256 int write, void __user *buffer, 2257 size_t *lenp, loff_t *ppos, 2258 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2259 int write, void *data), 2260 void *data) 2261 { 2262 int *i, vleft, first = 1, err = 0; 2263 unsigned long page = 0; 2264 size_t left; 2265 char *kbuf; 2266 2267 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2268 *lenp = 0; 2269 return 0; 2270 } 2271 2272 i = (int *) tbl_data; 2273 vleft = table->maxlen / sizeof(*i); 2274 left = *lenp; 2275 2276 if (!conv) 2277 conv = do_proc_dointvec_conv; 2278 2279 if (write) { 2280 if (left > PAGE_SIZE - 1) 2281 left = PAGE_SIZE - 1; 2282 page = __get_free_page(GFP_TEMPORARY); 2283 kbuf = (char *) page; 2284 if (!kbuf) 2285 return -ENOMEM; 2286 if (copy_from_user(kbuf, buffer, left)) { 2287 err = -EFAULT; 2288 goto free; 2289 } 2290 kbuf[left] = 0; 2291 } 2292 2293 for (; left && vleft--; i++, first=0) { 2294 unsigned long lval; 2295 bool neg; 2296 2297 if (write) { 2298 left -= proc_skip_spaces(&kbuf); 2299 2300 if (!left) 2301 break; 2302 err = proc_get_long(&kbuf, &left, &lval, &neg, 2303 proc_wspace_sep, 2304 sizeof(proc_wspace_sep), NULL); 2305 if (err) 2306 break; 2307 if (conv(&neg, &lval, i, 1, data)) { 2308 err = -EINVAL; 2309 break; 2310 } 2311 } else { 2312 if (conv(&neg, &lval, i, 0, data)) { 2313 err = -EINVAL; 2314 break; 2315 } 2316 if (!first) 2317 err = proc_put_char(&buffer, &left, '\t'); 2318 if (err) 2319 break; 2320 err = proc_put_long(&buffer, &left, lval, neg); 2321 if (err) 2322 break; 2323 } 2324 } 2325 2326 if (!write && !first && left && !err) 2327 err = proc_put_char(&buffer, &left, '\n'); 2328 if (write && !err && left) 2329 left -= proc_skip_spaces(&kbuf); 2330 free: 2331 if (write) { 2332 free_page(page); 2333 if (first) 2334 return err ? : -EINVAL; 2335 } 2336 *lenp -= left; 2337 *ppos += *lenp; 2338 return err; 2339 } 2340 2341 static int do_proc_dointvec(struct ctl_table *table, int write, 2342 void __user *buffer, size_t *lenp, loff_t *ppos, 2343 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2344 int write, void *data), 2345 void *data) 2346 { 2347 return __do_proc_dointvec(table->data, table, write, 2348 buffer, lenp, ppos, conv, data); 2349 } 2350 2351 /** 2352 * proc_dointvec - read a vector of integers 2353 * @table: the sysctl table 2354 * @write: %TRUE if this is a write to the sysctl file 2355 * @buffer: the user buffer 2356 * @lenp: the size of the user buffer 2357 * @ppos: file position 2358 * 2359 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2360 * values from/to the user buffer, treated as an ASCII string. 2361 * 2362 * Returns 0 on success. 2363 */ 2364 int proc_dointvec(struct ctl_table *table, int write, 2365 void __user *buffer, size_t *lenp, loff_t *ppos) 2366 { 2367 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2368 NULL,NULL); 2369 } 2370 2371 /* 2372 * Taint values can only be increased 2373 * This means we can safely use a temporary. 2374 */ 2375 static int proc_taint(struct ctl_table *table, int write, 2376 void __user *buffer, size_t *lenp, loff_t *ppos) 2377 { 2378 struct ctl_table t; 2379 unsigned long tmptaint = get_taint(); 2380 int err; 2381 2382 if (write && !capable(CAP_SYS_ADMIN)) 2383 return -EPERM; 2384 2385 t = *table; 2386 t.data = &tmptaint; 2387 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2388 if (err < 0) 2389 return err; 2390 2391 if (write) { 2392 /* 2393 * Poor man's atomic or. Not worth adding a primitive 2394 * to everyone's atomic.h for this 2395 */ 2396 int i; 2397 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2398 if ((tmptaint >> i) & 1) 2399 add_taint(i); 2400 } 2401 } 2402 2403 return err; 2404 } 2405 2406 #ifdef CONFIG_PRINTK 2407 static int proc_dmesg_restrict(struct ctl_table *table, int write, 2408 void __user *buffer, size_t *lenp, loff_t *ppos) 2409 { 2410 if (write && !capable(CAP_SYS_ADMIN)) 2411 return -EPERM; 2412 2413 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2414 } 2415 #endif 2416 2417 struct do_proc_dointvec_minmax_conv_param { 2418 int *min; 2419 int *max; 2420 }; 2421 2422 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2423 int *valp, 2424 int write, void *data) 2425 { 2426 struct do_proc_dointvec_minmax_conv_param *param = data; 2427 if (write) { 2428 int val = *negp ? -*lvalp : *lvalp; 2429 if ((param->min && *param->min > val) || 2430 (param->max && *param->max < val)) 2431 return -EINVAL; 2432 *valp = val; 2433 } else { 2434 int val = *valp; 2435 if (val < 0) { 2436 *negp = true; 2437 *lvalp = (unsigned long)-val; 2438 } else { 2439 *negp = false; 2440 *lvalp = (unsigned long)val; 2441 } 2442 } 2443 return 0; 2444 } 2445 2446 /** 2447 * proc_dointvec_minmax - read a vector of integers with min/max values 2448 * @table: the sysctl table 2449 * @write: %TRUE if this is a write to the sysctl file 2450 * @buffer: the user buffer 2451 * @lenp: the size of the user buffer 2452 * @ppos: file position 2453 * 2454 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2455 * values from/to the user buffer, treated as an ASCII string. 2456 * 2457 * This routine will ensure the values are within the range specified by 2458 * table->extra1 (min) and table->extra2 (max). 2459 * 2460 * Returns 0 on success. 2461 */ 2462 int proc_dointvec_minmax(struct ctl_table *table, int write, 2463 void __user *buffer, size_t *lenp, loff_t *ppos) 2464 { 2465 struct do_proc_dointvec_minmax_conv_param param = { 2466 .min = (int *) table->extra1, 2467 .max = (int *) table->extra2, 2468 }; 2469 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2470 do_proc_dointvec_minmax_conv, ¶m); 2471 } 2472 2473 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2474 void __user *buffer, 2475 size_t *lenp, loff_t *ppos, 2476 unsigned long convmul, 2477 unsigned long convdiv) 2478 { 2479 unsigned long *i, *min, *max; 2480 int vleft, first = 1, err = 0; 2481 unsigned long page = 0; 2482 size_t left; 2483 char *kbuf; 2484 2485 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2486 *lenp = 0; 2487 return 0; 2488 } 2489 2490 i = (unsigned long *) data; 2491 min = (unsigned long *) table->extra1; 2492 max = (unsigned long *) table->extra2; 2493 vleft = table->maxlen / sizeof(unsigned long); 2494 left = *lenp; 2495 2496 if (write) { 2497 if (left > PAGE_SIZE - 1) 2498 left = PAGE_SIZE - 1; 2499 page = __get_free_page(GFP_TEMPORARY); 2500 kbuf = (char *) page; 2501 if (!kbuf) 2502 return -ENOMEM; 2503 if (copy_from_user(kbuf, buffer, left)) { 2504 err = -EFAULT; 2505 goto free; 2506 } 2507 kbuf[left] = 0; 2508 } 2509 2510 for (; left && vleft--; i++, first = 0) { 2511 unsigned long val; 2512 2513 if (write) { 2514 bool neg; 2515 2516 left -= proc_skip_spaces(&kbuf); 2517 2518 err = proc_get_long(&kbuf, &left, &val, &neg, 2519 proc_wspace_sep, 2520 sizeof(proc_wspace_sep), NULL); 2521 if (err) 2522 break; 2523 if (neg) 2524 continue; 2525 if ((min && val < *min) || (max && val > *max)) 2526 continue; 2527 *i = val; 2528 } else { 2529 val = convdiv * (*i) / convmul; 2530 if (!first) 2531 err = proc_put_char(&buffer, &left, '\t'); 2532 err = proc_put_long(&buffer, &left, val, false); 2533 if (err) 2534 break; 2535 } 2536 } 2537 2538 if (!write && !first && left && !err) 2539 err = proc_put_char(&buffer, &left, '\n'); 2540 if (write && !err) 2541 left -= proc_skip_spaces(&kbuf); 2542 free: 2543 if (write) { 2544 free_page(page); 2545 if (first) 2546 return err ? : -EINVAL; 2547 } 2548 *lenp -= left; 2549 *ppos += *lenp; 2550 return err; 2551 } 2552 2553 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2554 void __user *buffer, 2555 size_t *lenp, loff_t *ppos, 2556 unsigned long convmul, 2557 unsigned long convdiv) 2558 { 2559 return __do_proc_doulongvec_minmax(table->data, table, write, 2560 buffer, lenp, ppos, convmul, convdiv); 2561 } 2562 2563 /** 2564 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2565 * @table: the sysctl table 2566 * @write: %TRUE if this is a write to the sysctl file 2567 * @buffer: the user buffer 2568 * @lenp: the size of the user buffer 2569 * @ppos: file position 2570 * 2571 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2572 * values from/to the user buffer, treated as an ASCII string. 2573 * 2574 * This routine will ensure the values are within the range specified by 2575 * table->extra1 (min) and table->extra2 (max). 2576 * 2577 * Returns 0 on success. 2578 */ 2579 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2580 void __user *buffer, size_t *lenp, loff_t *ppos) 2581 { 2582 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2583 } 2584 2585 /** 2586 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2587 * @table: the sysctl table 2588 * @write: %TRUE if this is a write to the sysctl file 2589 * @buffer: the user buffer 2590 * @lenp: the size of the user buffer 2591 * @ppos: file position 2592 * 2593 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2594 * values from/to the user buffer, treated as an ASCII string. The values 2595 * are treated as milliseconds, and converted to jiffies when they are stored. 2596 * 2597 * This routine will ensure the values are within the range specified by 2598 * table->extra1 (min) and table->extra2 (max). 2599 * 2600 * Returns 0 on success. 2601 */ 2602 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2603 void __user *buffer, 2604 size_t *lenp, loff_t *ppos) 2605 { 2606 return do_proc_doulongvec_minmax(table, write, buffer, 2607 lenp, ppos, HZ, 1000l); 2608 } 2609 2610 2611 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2612 int *valp, 2613 int write, void *data) 2614 { 2615 if (write) { 2616 if (*lvalp > LONG_MAX / HZ) 2617 return 1; 2618 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2619 } else { 2620 int val = *valp; 2621 unsigned long lval; 2622 if (val < 0) { 2623 *negp = true; 2624 lval = (unsigned long)-val; 2625 } else { 2626 *negp = false; 2627 lval = (unsigned long)val; 2628 } 2629 *lvalp = lval / HZ; 2630 } 2631 return 0; 2632 } 2633 2634 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2635 int *valp, 2636 int write, void *data) 2637 { 2638 if (write) { 2639 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2640 return 1; 2641 *valp = clock_t_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_clock_t(lval); 2653 } 2654 return 0; 2655 } 2656 2657 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2658 int *valp, 2659 int write, void *data) 2660 { 2661 if (write) { 2662 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2663 } else { 2664 int val = *valp; 2665 unsigned long lval; 2666 if (val < 0) { 2667 *negp = true; 2668 lval = (unsigned long)-val; 2669 } else { 2670 *negp = false; 2671 lval = (unsigned long)val; 2672 } 2673 *lvalp = jiffies_to_msecs(lval); 2674 } 2675 return 0; 2676 } 2677 2678 /** 2679 * proc_dointvec_jiffies - read a vector of integers as seconds 2680 * @table: the sysctl table 2681 * @write: %TRUE if this is a write to the sysctl file 2682 * @buffer: the user buffer 2683 * @lenp: the size of the user buffer 2684 * @ppos: file position 2685 * 2686 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2687 * values from/to the user buffer, treated as an ASCII string. 2688 * The values read are assumed to be in seconds, and are converted into 2689 * jiffies. 2690 * 2691 * Returns 0 on success. 2692 */ 2693 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2694 void __user *buffer, size_t *lenp, loff_t *ppos) 2695 { 2696 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2697 do_proc_dointvec_jiffies_conv,NULL); 2698 } 2699 2700 /** 2701 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2702 * @table: the sysctl table 2703 * @write: %TRUE if this is a write to the sysctl file 2704 * @buffer: the user buffer 2705 * @lenp: the size of the user buffer 2706 * @ppos: pointer to the file position 2707 * 2708 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2709 * values from/to the user buffer, treated as an ASCII string. 2710 * The values read are assumed to be in 1/USER_HZ seconds, and 2711 * are converted into jiffies. 2712 * 2713 * Returns 0 on success. 2714 */ 2715 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2716 void __user *buffer, size_t *lenp, loff_t *ppos) 2717 { 2718 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2719 do_proc_dointvec_userhz_jiffies_conv,NULL); 2720 } 2721 2722 /** 2723 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2724 * @table: the sysctl table 2725 * @write: %TRUE if this is a write to the sysctl file 2726 * @buffer: the user buffer 2727 * @lenp: the size of the user buffer 2728 * @ppos: file position 2729 * @ppos: the current position in the file 2730 * 2731 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2732 * values from/to the user buffer, treated as an ASCII string. 2733 * The values read are assumed to be in 1/1000 seconds, and 2734 * are converted into jiffies. 2735 * 2736 * Returns 0 on success. 2737 */ 2738 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2739 void __user *buffer, size_t *lenp, loff_t *ppos) 2740 { 2741 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2742 do_proc_dointvec_ms_jiffies_conv, NULL); 2743 } 2744 2745 static int proc_do_cad_pid(struct ctl_table *table, int write, 2746 void __user *buffer, size_t *lenp, loff_t *ppos) 2747 { 2748 struct pid *new_pid; 2749 pid_t tmp; 2750 int r; 2751 2752 tmp = pid_vnr(cad_pid); 2753 2754 r = __do_proc_dointvec(&tmp, table, write, buffer, 2755 lenp, ppos, NULL, NULL); 2756 if (r || !write) 2757 return r; 2758 2759 new_pid = find_get_pid(tmp); 2760 if (!new_pid) 2761 return -ESRCH; 2762 2763 put_pid(xchg(&cad_pid, new_pid)); 2764 return 0; 2765 } 2766 2767 /** 2768 * proc_do_large_bitmap - read/write from/to a large bitmap 2769 * @table: the sysctl table 2770 * @write: %TRUE if this is a write to the sysctl file 2771 * @buffer: the user buffer 2772 * @lenp: the size of the user buffer 2773 * @ppos: file position 2774 * 2775 * The bitmap is stored at table->data and the bitmap length (in bits) 2776 * in table->maxlen. 2777 * 2778 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2779 * large bitmaps may be represented in a compact manner. Writing into 2780 * the file will clear the bitmap then update it with the given input. 2781 * 2782 * Returns 0 on success. 2783 */ 2784 int proc_do_large_bitmap(struct ctl_table *table, int write, 2785 void __user *buffer, size_t *lenp, loff_t *ppos) 2786 { 2787 int err = 0; 2788 bool first = 1; 2789 size_t left = *lenp; 2790 unsigned long bitmap_len = table->maxlen; 2791 unsigned long *bitmap = (unsigned long *) table->data; 2792 unsigned long *tmp_bitmap = NULL; 2793 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2794 2795 if (!bitmap_len || !left || (*ppos && !write)) { 2796 *lenp = 0; 2797 return 0; 2798 } 2799 2800 if (write) { 2801 unsigned long page = 0; 2802 char *kbuf; 2803 2804 if (left > PAGE_SIZE - 1) 2805 left = PAGE_SIZE - 1; 2806 2807 page = __get_free_page(GFP_TEMPORARY); 2808 kbuf = (char *) page; 2809 if (!kbuf) 2810 return -ENOMEM; 2811 if (copy_from_user(kbuf, buffer, left)) { 2812 free_page(page); 2813 return -EFAULT; 2814 } 2815 kbuf[left] = 0; 2816 2817 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2818 GFP_KERNEL); 2819 if (!tmp_bitmap) { 2820 free_page(page); 2821 return -ENOMEM; 2822 } 2823 proc_skip_char(&kbuf, &left, '\n'); 2824 while (!err && left) { 2825 unsigned long val_a, val_b; 2826 bool neg; 2827 2828 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2829 sizeof(tr_a), &c); 2830 if (err) 2831 break; 2832 if (val_a >= bitmap_len || neg) { 2833 err = -EINVAL; 2834 break; 2835 } 2836 2837 val_b = val_a; 2838 if (left) { 2839 kbuf++; 2840 left--; 2841 } 2842 2843 if (c == '-') { 2844 err = proc_get_long(&kbuf, &left, &val_b, 2845 &neg, tr_b, sizeof(tr_b), 2846 &c); 2847 if (err) 2848 break; 2849 if (val_b >= bitmap_len || neg || 2850 val_a > val_b) { 2851 err = -EINVAL; 2852 break; 2853 } 2854 if (left) { 2855 kbuf++; 2856 left--; 2857 } 2858 } 2859 2860 while (val_a <= val_b) 2861 set_bit(val_a++, tmp_bitmap); 2862 2863 first = 0; 2864 proc_skip_char(&kbuf, &left, '\n'); 2865 } 2866 free_page(page); 2867 } else { 2868 unsigned long bit_a, bit_b = 0; 2869 2870 while (left) { 2871 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2872 if (bit_a >= bitmap_len) 2873 break; 2874 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2875 bit_a + 1) - 1; 2876 2877 if (!first) { 2878 err = proc_put_char(&buffer, &left, ','); 2879 if (err) 2880 break; 2881 } 2882 err = proc_put_long(&buffer, &left, bit_a, false); 2883 if (err) 2884 break; 2885 if (bit_a != bit_b) { 2886 err = proc_put_char(&buffer, &left, '-'); 2887 if (err) 2888 break; 2889 err = proc_put_long(&buffer, &left, bit_b, false); 2890 if (err) 2891 break; 2892 } 2893 2894 first = 0; bit_b++; 2895 } 2896 if (!err) 2897 err = proc_put_char(&buffer, &left, '\n'); 2898 } 2899 2900 if (!err) { 2901 if (write) { 2902 if (*ppos) 2903 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2904 else 2905 memcpy(bitmap, tmp_bitmap, 2906 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2907 } 2908 kfree(tmp_bitmap); 2909 *lenp -= left; 2910 *ppos += *lenp; 2911 return 0; 2912 } else { 2913 kfree(tmp_bitmap); 2914 return err; 2915 } 2916 } 2917 2918 #else /* CONFIG_PROC_SYSCTL */ 2919 2920 int proc_dostring(struct ctl_table *table, int write, 2921 void __user *buffer, size_t *lenp, loff_t *ppos) 2922 { 2923 return -ENOSYS; 2924 } 2925 2926 int proc_dointvec(struct ctl_table *table, int write, 2927 void __user *buffer, size_t *lenp, loff_t *ppos) 2928 { 2929 return -ENOSYS; 2930 } 2931 2932 int proc_dointvec_minmax(struct ctl_table *table, int write, 2933 void __user *buffer, size_t *lenp, loff_t *ppos) 2934 { 2935 return -ENOSYS; 2936 } 2937 2938 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2939 void __user *buffer, size_t *lenp, loff_t *ppos) 2940 { 2941 return -ENOSYS; 2942 } 2943 2944 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2945 void __user *buffer, size_t *lenp, loff_t *ppos) 2946 { 2947 return -ENOSYS; 2948 } 2949 2950 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2951 void __user *buffer, size_t *lenp, loff_t *ppos) 2952 { 2953 return -ENOSYS; 2954 } 2955 2956 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2957 void __user *buffer, size_t *lenp, loff_t *ppos) 2958 { 2959 return -ENOSYS; 2960 } 2961 2962 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2963 void __user *buffer, 2964 size_t *lenp, loff_t *ppos) 2965 { 2966 return -ENOSYS; 2967 } 2968 2969 2970 #endif /* CONFIG_PROC_SYSCTL */ 2971 2972 /* 2973 * No sense putting this after each symbol definition, twice, 2974 * exception granted :-) 2975 */ 2976 EXPORT_SYMBOL(proc_dointvec); 2977 EXPORT_SYMBOL(proc_dointvec_jiffies); 2978 EXPORT_SYMBOL(proc_dointvec_minmax); 2979 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2980 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2981 EXPORT_SYMBOL(proc_dostring); 2982 EXPORT_SYMBOL(proc_doulongvec_minmax); 2983 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2984 EXPORT_SYMBOL(register_sysctl_table); 2985 EXPORT_SYMBOL(register_sysctl_paths); 2986 EXPORT_SYMBOL(unregister_sysctl_table); 2987