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 #include <linux/kmod.h> 60 61 #include <asm/uaccess.h> 62 #include <asm/processor.h> 63 64 #ifdef CONFIG_X86 65 #include <asm/nmi.h> 66 #include <asm/stacktrace.h> 67 #include <asm/io.h> 68 #endif 69 #ifdef CONFIG_BSD_PROCESS_ACCT 70 #include <linux/acct.h> 71 #endif 72 #ifdef CONFIG_RT_MUTEXES 73 #include <linux/rtmutex.h> 74 #endif 75 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 76 #include <linux/lockdep.h> 77 #endif 78 #ifdef CONFIG_CHR_DEV_SG 79 #include <scsi/sg.h> 80 #endif 81 82 #ifdef CONFIG_LOCKUP_DETECTOR 83 #include <linux/nmi.h> 84 #endif 85 86 87 #if defined(CONFIG_SYSCTL) 88 89 /* External variables not in a header file. */ 90 extern int sysctl_overcommit_memory; 91 extern int sysctl_overcommit_ratio; 92 extern int max_threads; 93 extern int core_uses_pid; 94 extern int suid_dumpable; 95 extern char core_pattern[]; 96 extern unsigned int core_pipe_limit; 97 extern int pid_max; 98 extern int min_free_kbytes; 99 extern int pid_max_min, pid_max_max; 100 extern int sysctl_drop_caches; 101 extern int percpu_pagelist_fraction; 102 extern int compat_log; 103 extern int latencytop_enabled; 104 extern int sysctl_nr_open_min, sysctl_nr_open_max; 105 #ifndef CONFIG_MMU 106 extern int sysctl_nr_trim_pages; 107 #endif 108 #ifdef CONFIG_BLOCK 109 extern int blk_iopoll_enabled; 110 #endif 111 112 /* Constants used for minimum and maximum */ 113 #ifdef CONFIG_LOCKUP_DETECTOR 114 static int sixty = 60; 115 static int neg_one = -1; 116 #endif 117 118 static int zero; 119 static int __maybe_unused one = 1; 120 static int __maybe_unused two = 2; 121 static int __maybe_unused three = 3; 122 static unsigned long one_ul = 1; 123 static int one_hundred = 100; 124 #ifdef CONFIG_PRINTK 125 static int ten_thousand = 10000; 126 #endif 127 128 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 129 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 130 131 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 132 static int maxolduid = 65535; 133 static int minolduid; 134 static int min_percpu_pagelist_fract = 8; 135 136 static int ngroups_max = NGROUPS_MAX; 137 138 #ifdef CONFIG_INOTIFY_USER 139 #include <linux/inotify.h> 140 #endif 141 #ifdef CONFIG_SPARC 142 #include <asm/system.h> 143 #endif 144 145 #ifdef CONFIG_SPARC64 146 extern int sysctl_tsb_ratio; 147 #endif 148 149 #ifdef __hppa__ 150 extern int pwrsw_enabled; 151 extern int unaligned_enabled; 152 #endif 153 154 #ifdef CONFIG_S390 155 #ifdef CONFIG_MATHEMU 156 extern int sysctl_ieee_emulation_warnings; 157 #endif 158 extern int sysctl_userprocess_debug; 159 extern int spin_retry; 160 #endif 161 162 #ifdef CONFIG_IA64 163 extern int no_unaligned_warning; 164 extern int unaligned_dump_stack; 165 #endif 166 167 #ifdef CONFIG_PROC_SYSCTL 168 static int proc_do_cad_pid(struct ctl_table *table, int write, 169 void __user *buffer, size_t *lenp, loff_t *ppos); 170 static int proc_taint(struct ctl_table *table, int write, 171 void __user *buffer, size_t *lenp, loff_t *ppos); 172 #endif 173 174 #ifdef CONFIG_PRINTK 175 static int proc_dmesg_restrict(struct ctl_table *table, int write, 176 void __user *buffer, size_t *lenp, loff_t *ppos); 177 #endif 178 179 #ifdef CONFIG_MAGIC_SYSRQ 180 /* Note: sysrq code uses it's own private copy */ 181 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 182 183 static int sysrq_sysctl_handler(ctl_table *table, int write, 184 void __user *buffer, size_t *lenp, 185 loff_t *ppos) 186 { 187 int error; 188 189 error = proc_dointvec(table, write, buffer, lenp, ppos); 190 if (error) 191 return error; 192 193 if (write) 194 sysrq_toggle_support(__sysrq_enabled); 195 196 return 0; 197 } 198 199 #endif 200 201 static struct ctl_table root_table[]; 202 static struct ctl_table_root sysctl_table_root; 203 static struct ctl_table_header root_table_header = { 204 {{.count = 1, 205 .ctl_table = root_table, 206 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, 207 .root = &sysctl_table_root, 208 .set = &sysctl_table_root.default_set, 209 }; 210 static struct ctl_table_root sysctl_table_root = { 211 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 212 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 213 }; 214 215 static struct ctl_table kern_table[]; 216 static struct ctl_table vm_table[]; 217 static struct ctl_table fs_table[]; 218 static struct ctl_table debug_table[]; 219 static struct ctl_table dev_table[]; 220 extern struct ctl_table random_table[]; 221 #ifdef CONFIG_EPOLL 222 extern struct ctl_table epoll_table[]; 223 #endif 224 225 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 226 int sysctl_legacy_va_layout; 227 #endif 228 229 /* The default sysctl tables: */ 230 231 static struct ctl_table root_table[] = { 232 { 233 .procname = "kernel", 234 .mode = 0555, 235 .child = kern_table, 236 }, 237 { 238 .procname = "vm", 239 .mode = 0555, 240 .child = vm_table, 241 }, 242 { 243 .procname = "fs", 244 .mode = 0555, 245 .child = fs_table, 246 }, 247 { 248 .procname = "debug", 249 .mode = 0555, 250 .child = debug_table, 251 }, 252 { 253 .procname = "dev", 254 .mode = 0555, 255 .child = dev_table, 256 }, 257 { } 258 }; 259 260 #ifdef CONFIG_SCHED_DEBUG 261 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 262 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 263 static int min_wakeup_granularity_ns; /* 0 usecs */ 264 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 265 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 266 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 267 #endif 268 269 #ifdef CONFIG_COMPACTION 270 static int min_extfrag_threshold; 271 static int max_extfrag_threshold = 1000; 272 #endif 273 274 static struct ctl_table kern_table[] = { 275 { 276 .procname = "sched_child_runs_first", 277 .data = &sysctl_sched_child_runs_first, 278 .maxlen = sizeof(unsigned int), 279 .mode = 0644, 280 .proc_handler = proc_dointvec, 281 }, 282 #ifdef CONFIG_SCHED_DEBUG 283 { 284 .procname = "sched_min_granularity_ns", 285 .data = &sysctl_sched_min_granularity, 286 .maxlen = sizeof(unsigned int), 287 .mode = 0644, 288 .proc_handler = sched_proc_update_handler, 289 .extra1 = &min_sched_granularity_ns, 290 .extra2 = &max_sched_granularity_ns, 291 }, 292 { 293 .procname = "sched_latency_ns", 294 .data = &sysctl_sched_latency, 295 .maxlen = sizeof(unsigned int), 296 .mode = 0644, 297 .proc_handler = sched_proc_update_handler, 298 .extra1 = &min_sched_granularity_ns, 299 .extra2 = &max_sched_granularity_ns, 300 }, 301 { 302 .procname = "sched_wakeup_granularity_ns", 303 .data = &sysctl_sched_wakeup_granularity, 304 .maxlen = sizeof(unsigned int), 305 .mode = 0644, 306 .proc_handler = sched_proc_update_handler, 307 .extra1 = &min_wakeup_granularity_ns, 308 .extra2 = &max_wakeup_granularity_ns, 309 }, 310 { 311 .procname = "sched_tunable_scaling", 312 .data = &sysctl_sched_tunable_scaling, 313 .maxlen = sizeof(enum sched_tunable_scaling), 314 .mode = 0644, 315 .proc_handler = sched_proc_update_handler, 316 .extra1 = &min_sched_tunable_scaling, 317 .extra2 = &max_sched_tunable_scaling, 318 }, 319 { 320 .procname = "sched_migration_cost", 321 .data = &sysctl_sched_migration_cost, 322 .maxlen = sizeof(unsigned int), 323 .mode = 0644, 324 .proc_handler = proc_dointvec, 325 }, 326 { 327 .procname = "sched_nr_migrate", 328 .data = &sysctl_sched_nr_migrate, 329 .maxlen = sizeof(unsigned int), 330 .mode = 0644, 331 .proc_handler = proc_dointvec, 332 }, 333 { 334 .procname = "sched_time_avg", 335 .data = &sysctl_sched_time_avg, 336 .maxlen = sizeof(unsigned int), 337 .mode = 0644, 338 .proc_handler = proc_dointvec, 339 }, 340 { 341 .procname = "sched_shares_window", 342 .data = &sysctl_sched_shares_window, 343 .maxlen = sizeof(unsigned int), 344 .mode = 0644, 345 .proc_handler = proc_dointvec, 346 }, 347 { 348 .procname = "timer_migration", 349 .data = &sysctl_timer_migration, 350 .maxlen = sizeof(unsigned int), 351 .mode = 0644, 352 .proc_handler = proc_dointvec_minmax, 353 .extra1 = &zero, 354 .extra2 = &one, 355 }, 356 #endif 357 { 358 .procname = "sched_rt_period_us", 359 .data = &sysctl_sched_rt_period, 360 .maxlen = sizeof(unsigned int), 361 .mode = 0644, 362 .proc_handler = sched_rt_handler, 363 }, 364 { 365 .procname = "sched_rt_runtime_us", 366 .data = &sysctl_sched_rt_runtime, 367 .maxlen = sizeof(int), 368 .mode = 0644, 369 .proc_handler = sched_rt_handler, 370 }, 371 #ifdef CONFIG_SCHED_AUTOGROUP 372 { 373 .procname = "sched_autogroup_enabled", 374 .data = &sysctl_sched_autogroup_enabled, 375 .maxlen = sizeof(unsigned int), 376 .mode = 0644, 377 .proc_handler = proc_dointvec_minmax, 378 .extra1 = &zero, 379 .extra2 = &one, 380 }, 381 #endif 382 #ifdef CONFIG_PROVE_LOCKING 383 { 384 .procname = "prove_locking", 385 .data = &prove_locking, 386 .maxlen = sizeof(int), 387 .mode = 0644, 388 .proc_handler = proc_dointvec, 389 }, 390 #endif 391 #ifdef CONFIG_LOCK_STAT 392 { 393 .procname = "lock_stat", 394 .data = &lock_stat, 395 .maxlen = sizeof(int), 396 .mode = 0644, 397 .proc_handler = proc_dointvec, 398 }, 399 #endif 400 { 401 .procname = "panic", 402 .data = &panic_timeout, 403 .maxlen = sizeof(int), 404 .mode = 0644, 405 .proc_handler = proc_dointvec, 406 }, 407 { 408 .procname = "core_uses_pid", 409 .data = &core_uses_pid, 410 .maxlen = sizeof(int), 411 .mode = 0644, 412 .proc_handler = proc_dointvec, 413 }, 414 { 415 .procname = "core_pattern", 416 .data = core_pattern, 417 .maxlen = CORENAME_MAX_SIZE, 418 .mode = 0644, 419 .proc_handler = proc_dostring, 420 }, 421 { 422 .procname = "core_pipe_limit", 423 .data = &core_pipe_limit, 424 .maxlen = sizeof(unsigned int), 425 .mode = 0644, 426 .proc_handler = proc_dointvec, 427 }, 428 #ifdef CONFIG_PROC_SYSCTL 429 { 430 .procname = "tainted", 431 .maxlen = sizeof(long), 432 .mode = 0644, 433 .proc_handler = proc_taint, 434 }, 435 #endif 436 #ifdef CONFIG_LATENCYTOP 437 { 438 .procname = "latencytop", 439 .data = &latencytop_enabled, 440 .maxlen = sizeof(int), 441 .mode = 0644, 442 .proc_handler = proc_dointvec, 443 }, 444 #endif 445 #ifdef CONFIG_BLK_DEV_INITRD 446 { 447 .procname = "real-root-dev", 448 .data = &real_root_dev, 449 .maxlen = sizeof(int), 450 .mode = 0644, 451 .proc_handler = proc_dointvec, 452 }, 453 #endif 454 { 455 .procname = "print-fatal-signals", 456 .data = &print_fatal_signals, 457 .maxlen = sizeof(int), 458 .mode = 0644, 459 .proc_handler = proc_dointvec, 460 }, 461 #ifdef CONFIG_SPARC 462 { 463 .procname = "reboot-cmd", 464 .data = reboot_command, 465 .maxlen = 256, 466 .mode = 0644, 467 .proc_handler = proc_dostring, 468 }, 469 { 470 .procname = "stop-a", 471 .data = &stop_a_enabled, 472 .maxlen = sizeof (int), 473 .mode = 0644, 474 .proc_handler = proc_dointvec, 475 }, 476 { 477 .procname = "scons-poweroff", 478 .data = &scons_pwroff, 479 .maxlen = sizeof (int), 480 .mode = 0644, 481 .proc_handler = proc_dointvec, 482 }, 483 #endif 484 #ifdef CONFIG_SPARC64 485 { 486 .procname = "tsb-ratio", 487 .data = &sysctl_tsb_ratio, 488 .maxlen = sizeof (int), 489 .mode = 0644, 490 .proc_handler = proc_dointvec, 491 }, 492 #endif 493 #ifdef __hppa__ 494 { 495 .procname = "soft-power", 496 .data = &pwrsw_enabled, 497 .maxlen = sizeof (int), 498 .mode = 0644, 499 .proc_handler = proc_dointvec, 500 }, 501 { 502 .procname = "unaligned-trap", 503 .data = &unaligned_enabled, 504 .maxlen = sizeof (int), 505 .mode = 0644, 506 .proc_handler = proc_dointvec, 507 }, 508 #endif 509 { 510 .procname = "ctrl-alt-del", 511 .data = &C_A_D, 512 .maxlen = sizeof(int), 513 .mode = 0644, 514 .proc_handler = proc_dointvec, 515 }, 516 #ifdef CONFIG_FUNCTION_TRACER 517 { 518 .procname = "ftrace_enabled", 519 .data = &ftrace_enabled, 520 .maxlen = sizeof(int), 521 .mode = 0644, 522 .proc_handler = ftrace_enable_sysctl, 523 }, 524 #endif 525 #ifdef CONFIG_STACK_TRACER 526 { 527 .procname = "stack_tracer_enabled", 528 .data = &stack_tracer_enabled, 529 .maxlen = sizeof(int), 530 .mode = 0644, 531 .proc_handler = stack_trace_sysctl, 532 }, 533 #endif 534 #ifdef CONFIG_TRACING 535 { 536 .procname = "ftrace_dump_on_oops", 537 .data = &ftrace_dump_on_oops, 538 .maxlen = sizeof(int), 539 .mode = 0644, 540 .proc_handler = proc_dointvec, 541 }, 542 #endif 543 #ifdef CONFIG_MODULES 544 { 545 .procname = "modprobe", 546 .data = &modprobe_path, 547 .maxlen = KMOD_PATH_LEN, 548 .mode = 0644, 549 .proc_handler = proc_dostring, 550 }, 551 { 552 .procname = "modules_disabled", 553 .data = &modules_disabled, 554 .maxlen = sizeof(int), 555 .mode = 0644, 556 /* only handle a transition from default "0" to "1" */ 557 .proc_handler = proc_dointvec_minmax, 558 .extra1 = &one, 559 .extra2 = &one, 560 }, 561 #endif 562 #ifdef CONFIG_HOTPLUG 563 { 564 .procname = "hotplug", 565 .data = &uevent_helper, 566 .maxlen = UEVENT_HELPER_PATH_LEN, 567 .mode = 0644, 568 .proc_handler = proc_dostring, 569 }, 570 #endif 571 #ifdef CONFIG_CHR_DEV_SG 572 { 573 .procname = "sg-big-buff", 574 .data = &sg_big_buff, 575 .maxlen = sizeof (int), 576 .mode = 0444, 577 .proc_handler = proc_dointvec, 578 }, 579 #endif 580 #ifdef CONFIG_BSD_PROCESS_ACCT 581 { 582 .procname = "acct", 583 .data = &acct_parm, 584 .maxlen = 3*sizeof(int), 585 .mode = 0644, 586 .proc_handler = proc_dointvec, 587 }, 588 #endif 589 #ifdef CONFIG_MAGIC_SYSRQ 590 { 591 .procname = "sysrq", 592 .data = &__sysrq_enabled, 593 .maxlen = sizeof (int), 594 .mode = 0644, 595 .proc_handler = sysrq_sysctl_handler, 596 }, 597 #endif 598 #ifdef CONFIG_PROC_SYSCTL 599 { 600 .procname = "cad_pid", 601 .data = NULL, 602 .maxlen = sizeof (int), 603 .mode = 0600, 604 .proc_handler = proc_do_cad_pid, 605 }, 606 #endif 607 { 608 .procname = "threads-max", 609 .data = &max_threads, 610 .maxlen = sizeof(int), 611 .mode = 0644, 612 .proc_handler = proc_dointvec, 613 }, 614 { 615 .procname = "random", 616 .mode = 0555, 617 .child = random_table, 618 }, 619 { 620 .procname = "usermodehelper", 621 .mode = 0555, 622 .child = usermodehelper_table, 623 }, 624 { 625 .procname = "overflowuid", 626 .data = &overflowuid, 627 .maxlen = sizeof(int), 628 .mode = 0644, 629 .proc_handler = proc_dointvec_minmax, 630 .extra1 = &minolduid, 631 .extra2 = &maxolduid, 632 }, 633 { 634 .procname = "overflowgid", 635 .data = &overflowgid, 636 .maxlen = sizeof(int), 637 .mode = 0644, 638 .proc_handler = proc_dointvec_minmax, 639 .extra1 = &minolduid, 640 .extra2 = &maxolduid, 641 }, 642 #ifdef CONFIG_S390 643 #ifdef CONFIG_MATHEMU 644 { 645 .procname = "ieee_emulation_warnings", 646 .data = &sysctl_ieee_emulation_warnings, 647 .maxlen = sizeof(int), 648 .mode = 0644, 649 .proc_handler = proc_dointvec, 650 }, 651 #endif 652 { 653 .procname = "userprocess_debug", 654 .data = &show_unhandled_signals, 655 .maxlen = sizeof(int), 656 .mode = 0644, 657 .proc_handler = proc_dointvec, 658 }, 659 #endif 660 { 661 .procname = "pid_max", 662 .data = &pid_max, 663 .maxlen = sizeof (int), 664 .mode = 0644, 665 .proc_handler = proc_dointvec_minmax, 666 .extra1 = &pid_max_min, 667 .extra2 = &pid_max_max, 668 }, 669 { 670 .procname = "panic_on_oops", 671 .data = &panic_on_oops, 672 .maxlen = sizeof(int), 673 .mode = 0644, 674 .proc_handler = proc_dointvec, 675 }, 676 #if defined CONFIG_PRINTK 677 { 678 .procname = "printk", 679 .data = &console_loglevel, 680 .maxlen = 4*sizeof(int), 681 .mode = 0644, 682 .proc_handler = proc_dointvec, 683 }, 684 { 685 .procname = "printk_ratelimit", 686 .data = &printk_ratelimit_state.interval, 687 .maxlen = sizeof(int), 688 .mode = 0644, 689 .proc_handler = proc_dointvec_jiffies, 690 }, 691 { 692 .procname = "printk_ratelimit_burst", 693 .data = &printk_ratelimit_state.burst, 694 .maxlen = sizeof(int), 695 .mode = 0644, 696 .proc_handler = proc_dointvec, 697 }, 698 { 699 .procname = "printk_delay", 700 .data = &printk_delay_msec, 701 .maxlen = sizeof(int), 702 .mode = 0644, 703 .proc_handler = proc_dointvec_minmax, 704 .extra1 = &zero, 705 .extra2 = &ten_thousand, 706 }, 707 { 708 .procname = "dmesg_restrict", 709 .data = &dmesg_restrict, 710 .maxlen = sizeof(int), 711 .mode = 0644, 712 .proc_handler = proc_dointvec_minmax, 713 .extra1 = &zero, 714 .extra2 = &one, 715 }, 716 { 717 .procname = "kptr_restrict", 718 .data = &kptr_restrict, 719 .maxlen = sizeof(int), 720 .mode = 0644, 721 .proc_handler = proc_dmesg_restrict, 722 .extra1 = &zero, 723 .extra2 = &two, 724 }, 725 #endif 726 { 727 .procname = "ngroups_max", 728 .data = &ngroups_max, 729 .maxlen = sizeof (int), 730 .mode = 0444, 731 .proc_handler = proc_dointvec, 732 }, 733 #if defined(CONFIG_LOCKUP_DETECTOR) 734 { 735 .procname = "watchdog", 736 .data = &watchdog_enabled, 737 .maxlen = sizeof (int), 738 .mode = 0644, 739 .proc_handler = proc_dowatchdog, 740 .extra1 = &zero, 741 .extra2 = &one, 742 }, 743 { 744 .procname = "watchdog_thresh", 745 .data = &watchdog_thresh, 746 .maxlen = sizeof(int), 747 .mode = 0644, 748 .proc_handler = proc_dowatchdog, 749 .extra1 = &neg_one, 750 .extra2 = &sixty, 751 }, 752 { 753 .procname = "softlockup_panic", 754 .data = &softlockup_panic, 755 .maxlen = sizeof(int), 756 .mode = 0644, 757 .proc_handler = proc_dointvec_minmax, 758 .extra1 = &zero, 759 .extra2 = &one, 760 }, 761 { 762 .procname = "nmi_watchdog", 763 .data = &watchdog_enabled, 764 .maxlen = sizeof (int), 765 .mode = 0644, 766 .proc_handler = proc_dowatchdog, 767 .extra1 = &zero, 768 .extra2 = &one, 769 }, 770 #endif 771 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 772 { 773 .procname = "unknown_nmi_panic", 774 .data = &unknown_nmi_panic, 775 .maxlen = sizeof (int), 776 .mode = 0644, 777 .proc_handler = proc_dointvec, 778 }, 779 #endif 780 #if defined(CONFIG_X86) 781 { 782 .procname = "panic_on_unrecovered_nmi", 783 .data = &panic_on_unrecovered_nmi, 784 .maxlen = sizeof(int), 785 .mode = 0644, 786 .proc_handler = proc_dointvec, 787 }, 788 { 789 .procname = "panic_on_io_nmi", 790 .data = &panic_on_io_nmi, 791 .maxlen = sizeof(int), 792 .mode = 0644, 793 .proc_handler = proc_dointvec, 794 }, 795 { 796 .procname = "bootloader_type", 797 .data = &bootloader_type, 798 .maxlen = sizeof (int), 799 .mode = 0444, 800 .proc_handler = proc_dointvec, 801 }, 802 { 803 .procname = "bootloader_version", 804 .data = &bootloader_version, 805 .maxlen = sizeof (int), 806 .mode = 0444, 807 .proc_handler = proc_dointvec, 808 }, 809 { 810 .procname = "kstack_depth_to_print", 811 .data = &kstack_depth_to_print, 812 .maxlen = sizeof(int), 813 .mode = 0644, 814 .proc_handler = proc_dointvec, 815 }, 816 { 817 .procname = "io_delay_type", 818 .data = &io_delay_type, 819 .maxlen = sizeof(int), 820 .mode = 0644, 821 .proc_handler = proc_dointvec, 822 }, 823 #endif 824 #if defined(CONFIG_MMU) 825 { 826 .procname = "randomize_va_space", 827 .data = &randomize_va_space, 828 .maxlen = sizeof(int), 829 .mode = 0644, 830 .proc_handler = proc_dointvec, 831 }, 832 #endif 833 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 834 { 835 .procname = "spin_retry", 836 .data = &spin_retry, 837 .maxlen = sizeof (int), 838 .mode = 0644, 839 .proc_handler = proc_dointvec, 840 }, 841 #endif 842 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 843 { 844 .procname = "acpi_video_flags", 845 .data = &acpi_realmode_flags, 846 .maxlen = sizeof (unsigned long), 847 .mode = 0644, 848 .proc_handler = proc_doulongvec_minmax, 849 }, 850 #endif 851 #ifdef CONFIG_IA64 852 { 853 .procname = "ignore-unaligned-usertrap", 854 .data = &no_unaligned_warning, 855 .maxlen = sizeof (int), 856 .mode = 0644, 857 .proc_handler = proc_dointvec, 858 }, 859 { 860 .procname = "unaligned-dump-stack", 861 .data = &unaligned_dump_stack, 862 .maxlen = sizeof (int), 863 .mode = 0644, 864 .proc_handler = proc_dointvec, 865 }, 866 #endif 867 #ifdef CONFIG_DETECT_HUNG_TASK 868 { 869 .procname = "hung_task_panic", 870 .data = &sysctl_hung_task_panic, 871 .maxlen = sizeof(int), 872 .mode = 0644, 873 .proc_handler = proc_dointvec_minmax, 874 .extra1 = &zero, 875 .extra2 = &one, 876 }, 877 { 878 .procname = "hung_task_check_count", 879 .data = &sysctl_hung_task_check_count, 880 .maxlen = sizeof(unsigned long), 881 .mode = 0644, 882 .proc_handler = proc_doulongvec_minmax, 883 }, 884 { 885 .procname = "hung_task_timeout_secs", 886 .data = &sysctl_hung_task_timeout_secs, 887 .maxlen = sizeof(unsigned long), 888 .mode = 0644, 889 .proc_handler = proc_dohung_task_timeout_secs, 890 }, 891 { 892 .procname = "hung_task_warnings", 893 .data = &sysctl_hung_task_warnings, 894 .maxlen = sizeof(unsigned long), 895 .mode = 0644, 896 .proc_handler = proc_doulongvec_minmax, 897 }, 898 #endif 899 #ifdef CONFIG_COMPAT 900 { 901 .procname = "compat-log", 902 .data = &compat_log, 903 .maxlen = sizeof (int), 904 .mode = 0644, 905 .proc_handler = proc_dointvec, 906 }, 907 #endif 908 #ifdef CONFIG_RT_MUTEXES 909 { 910 .procname = "max_lock_depth", 911 .data = &max_lock_depth, 912 .maxlen = sizeof(int), 913 .mode = 0644, 914 .proc_handler = proc_dointvec, 915 }, 916 #endif 917 { 918 .procname = "poweroff_cmd", 919 .data = &poweroff_cmd, 920 .maxlen = POWEROFF_CMD_PATH_LEN, 921 .mode = 0644, 922 .proc_handler = proc_dostring, 923 }, 924 #ifdef CONFIG_KEYS 925 { 926 .procname = "keys", 927 .mode = 0555, 928 .child = key_sysctls, 929 }, 930 #endif 931 #ifdef CONFIG_RCU_TORTURE_TEST 932 { 933 .procname = "rcutorture_runnable", 934 .data = &rcutorture_runnable, 935 .maxlen = sizeof(int), 936 .mode = 0644, 937 .proc_handler = proc_dointvec, 938 }, 939 #endif 940 #ifdef CONFIG_PERF_EVENTS 941 /* 942 * User-space scripts rely on the existence of this file 943 * as a feature check for perf_events being enabled. 944 * 945 * So it's an ABI, do not remove! 946 */ 947 { 948 .procname = "perf_event_paranoid", 949 .data = &sysctl_perf_event_paranoid, 950 .maxlen = sizeof(sysctl_perf_event_paranoid), 951 .mode = 0644, 952 .proc_handler = proc_dointvec, 953 }, 954 { 955 .procname = "perf_event_mlock_kb", 956 .data = &sysctl_perf_event_mlock, 957 .maxlen = sizeof(sysctl_perf_event_mlock), 958 .mode = 0644, 959 .proc_handler = proc_dointvec, 960 }, 961 { 962 .procname = "perf_event_max_sample_rate", 963 .data = &sysctl_perf_event_sample_rate, 964 .maxlen = sizeof(sysctl_perf_event_sample_rate), 965 .mode = 0644, 966 .proc_handler = perf_proc_update_handler, 967 }, 968 #endif 969 #ifdef CONFIG_KMEMCHECK 970 { 971 .procname = "kmemcheck", 972 .data = &kmemcheck_enabled, 973 .maxlen = sizeof(int), 974 .mode = 0644, 975 .proc_handler = proc_dointvec, 976 }, 977 #endif 978 #ifdef CONFIG_BLOCK 979 { 980 .procname = "blk_iopoll", 981 .data = &blk_iopoll_enabled, 982 .maxlen = sizeof(int), 983 .mode = 0644, 984 .proc_handler = proc_dointvec, 985 }, 986 #endif 987 { } 988 }; 989 990 static struct ctl_table vm_table[] = { 991 { 992 .procname = "overcommit_memory", 993 .data = &sysctl_overcommit_memory, 994 .maxlen = sizeof(sysctl_overcommit_memory), 995 .mode = 0644, 996 .proc_handler = proc_dointvec_minmax, 997 .extra1 = &zero, 998 .extra2 = &two, 999 }, 1000 { 1001 .procname = "panic_on_oom", 1002 .data = &sysctl_panic_on_oom, 1003 .maxlen = sizeof(sysctl_panic_on_oom), 1004 .mode = 0644, 1005 .proc_handler = proc_dointvec_minmax, 1006 .extra1 = &zero, 1007 .extra2 = &two, 1008 }, 1009 { 1010 .procname = "oom_kill_allocating_task", 1011 .data = &sysctl_oom_kill_allocating_task, 1012 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1013 .mode = 0644, 1014 .proc_handler = proc_dointvec, 1015 }, 1016 { 1017 .procname = "oom_dump_tasks", 1018 .data = &sysctl_oom_dump_tasks, 1019 .maxlen = sizeof(sysctl_oom_dump_tasks), 1020 .mode = 0644, 1021 .proc_handler = proc_dointvec, 1022 }, 1023 { 1024 .procname = "overcommit_ratio", 1025 .data = &sysctl_overcommit_ratio, 1026 .maxlen = sizeof(sysctl_overcommit_ratio), 1027 .mode = 0644, 1028 .proc_handler = proc_dointvec, 1029 }, 1030 { 1031 .procname = "page-cluster", 1032 .data = &page_cluster, 1033 .maxlen = sizeof(int), 1034 .mode = 0644, 1035 .proc_handler = proc_dointvec_minmax, 1036 .extra1 = &zero, 1037 }, 1038 { 1039 .procname = "dirty_background_ratio", 1040 .data = &dirty_background_ratio, 1041 .maxlen = sizeof(dirty_background_ratio), 1042 .mode = 0644, 1043 .proc_handler = dirty_background_ratio_handler, 1044 .extra1 = &zero, 1045 .extra2 = &one_hundred, 1046 }, 1047 { 1048 .procname = "dirty_background_bytes", 1049 .data = &dirty_background_bytes, 1050 .maxlen = sizeof(dirty_background_bytes), 1051 .mode = 0644, 1052 .proc_handler = dirty_background_bytes_handler, 1053 .extra1 = &one_ul, 1054 }, 1055 { 1056 .procname = "dirty_ratio", 1057 .data = &vm_dirty_ratio, 1058 .maxlen = sizeof(vm_dirty_ratio), 1059 .mode = 0644, 1060 .proc_handler = dirty_ratio_handler, 1061 .extra1 = &zero, 1062 .extra2 = &one_hundred, 1063 }, 1064 { 1065 .procname = "dirty_bytes", 1066 .data = &vm_dirty_bytes, 1067 .maxlen = sizeof(vm_dirty_bytes), 1068 .mode = 0644, 1069 .proc_handler = dirty_bytes_handler, 1070 .extra1 = &dirty_bytes_min, 1071 }, 1072 { 1073 .procname = "dirty_writeback_centisecs", 1074 .data = &dirty_writeback_interval, 1075 .maxlen = sizeof(dirty_writeback_interval), 1076 .mode = 0644, 1077 .proc_handler = dirty_writeback_centisecs_handler, 1078 }, 1079 { 1080 .procname = "dirty_expire_centisecs", 1081 .data = &dirty_expire_interval, 1082 .maxlen = sizeof(dirty_expire_interval), 1083 .mode = 0644, 1084 .proc_handler = proc_dointvec_minmax, 1085 .extra1 = &zero, 1086 }, 1087 { 1088 .procname = "nr_pdflush_threads", 1089 .data = &nr_pdflush_threads, 1090 .maxlen = sizeof nr_pdflush_threads, 1091 .mode = 0444 /* read-only*/, 1092 .proc_handler = proc_dointvec, 1093 }, 1094 { 1095 .procname = "swappiness", 1096 .data = &vm_swappiness, 1097 .maxlen = sizeof(vm_swappiness), 1098 .mode = 0644, 1099 .proc_handler = proc_dointvec_minmax, 1100 .extra1 = &zero, 1101 .extra2 = &one_hundred, 1102 }, 1103 #ifdef CONFIG_HUGETLB_PAGE 1104 { 1105 .procname = "nr_hugepages", 1106 .data = NULL, 1107 .maxlen = sizeof(unsigned long), 1108 .mode = 0644, 1109 .proc_handler = hugetlb_sysctl_handler, 1110 .extra1 = (void *)&hugetlb_zero, 1111 .extra2 = (void *)&hugetlb_infinity, 1112 }, 1113 #ifdef CONFIG_NUMA 1114 { 1115 .procname = "nr_hugepages_mempolicy", 1116 .data = NULL, 1117 .maxlen = sizeof(unsigned long), 1118 .mode = 0644, 1119 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1120 .extra1 = (void *)&hugetlb_zero, 1121 .extra2 = (void *)&hugetlb_infinity, 1122 }, 1123 #endif 1124 { 1125 .procname = "hugetlb_shm_group", 1126 .data = &sysctl_hugetlb_shm_group, 1127 .maxlen = sizeof(gid_t), 1128 .mode = 0644, 1129 .proc_handler = proc_dointvec, 1130 }, 1131 { 1132 .procname = "hugepages_treat_as_movable", 1133 .data = &hugepages_treat_as_movable, 1134 .maxlen = sizeof(int), 1135 .mode = 0644, 1136 .proc_handler = hugetlb_treat_movable_handler, 1137 }, 1138 { 1139 .procname = "nr_overcommit_hugepages", 1140 .data = NULL, 1141 .maxlen = sizeof(unsigned long), 1142 .mode = 0644, 1143 .proc_handler = hugetlb_overcommit_handler, 1144 .extra1 = (void *)&hugetlb_zero, 1145 .extra2 = (void *)&hugetlb_infinity, 1146 }, 1147 #endif 1148 { 1149 .procname = "lowmem_reserve_ratio", 1150 .data = &sysctl_lowmem_reserve_ratio, 1151 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1152 .mode = 0644, 1153 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1154 }, 1155 { 1156 .procname = "drop_caches", 1157 .data = &sysctl_drop_caches, 1158 .maxlen = sizeof(int), 1159 .mode = 0644, 1160 .proc_handler = drop_caches_sysctl_handler, 1161 .extra1 = &one, 1162 .extra2 = &three, 1163 }, 1164 #ifdef CONFIG_COMPACTION 1165 { 1166 .procname = "compact_memory", 1167 .data = &sysctl_compact_memory, 1168 .maxlen = sizeof(int), 1169 .mode = 0200, 1170 .proc_handler = sysctl_compaction_handler, 1171 }, 1172 { 1173 .procname = "extfrag_threshold", 1174 .data = &sysctl_extfrag_threshold, 1175 .maxlen = sizeof(int), 1176 .mode = 0644, 1177 .proc_handler = sysctl_extfrag_handler, 1178 .extra1 = &min_extfrag_threshold, 1179 .extra2 = &max_extfrag_threshold, 1180 }, 1181 1182 #endif /* CONFIG_COMPACTION */ 1183 { 1184 .procname = "min_free_kbytes", 1185 .data = &min_free_kbytes, 1186 .maxlen = sizeof(min_free_kbytes), 1187 .mode = 0644, 1188 .proc_handler = min_free_kbytes_sysctl_handler, 1189 .extra1 = &zero, 1190 }, 1191 { 1192 .procname = "percpu_pagelist_fraction", 1193 .data = &percpu_pagelist_fraction, 1194 .maxlen = sizeof(percpu_pagelist_fraction), 1195 .mode = 0644, 1196 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1197 .extra1 = &min_percpu_pagelist_fract, 1198 }, 1199 #ifdef CONFIG_MMU 1200 { 1201 .procname = "max_map_count", 1202 .data = &sysctl_max_map_count, 1203 .maxlen = sizeof(sysctl_max_map_count), 1204 .mode = 0644, 1205 .proc_handler = proc_dointvec_minmax, 1206 .extra1 = &zero, 1207 }, 1208 #else 1209 { 1210 .procname = "nr_trim_pages", 1211 .data = &sysctl_nr_trim_pages, 1212 .maxlen = sizeof(sysctl_nr_trim_pages), 1213 .mode = 0644, 1214 .proc_handler = proc_dointvec_minmax, 1215 .extra1 = &zero, 1216 }, 1217 #endif 1218 { 1219 .procname = "laptop_mode", 1220 .data = &laptop_mode, 1221 .maxlen = sizeof(laptop_mode), 1222 .mode = 0644, 1223 .proc_handler = proc_dointvec_jiffies, 1224 }, 1225 { 1226 .procname = "block_dump", 1227 .data = &block_dump, 1228 .maxlen = sizeof(block_dump), 1229 .mode = 0644, 1230 .proc_handler = proc_dointvec, 1231 .extra1 = &zero, 1232 }, 1233 { 1234 .procname = "vfs_cache_pressure", 1235 .data = &sysctl_vfs_cache_pressure, 1236 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1237 .mode = 0644, 1238 .proc_handler = proc_dointvec, 1239 .extra1 = &zero, 1240 }, 1241 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1242 { 1243 .procname = "legacy_va_layout", 1244 .data = &sysctl_legacy_va_layout, 1245 .maxlen = sizeof(sysctl_legacy_va_layout), 1246 .mode = 0644, 1247 .proc_handler = proc_dointvec, 1248 .extra1 = &zero, 1249 }, 1250 #endif 1251 #ifdef CONFIG_NUMA 1252 { 1253 .procname = "zone_reclaim_mode", 1254 .data = &zone_reclaim_mode, 1255 .maxlen = sizeof(zone_reclaim_mode), 1256 .mode = 0644, 1257 .proc_handler = proc_dointvec, 1258 .extra1 = &zero, 1259 }, 1260 { 1261 .procname = "min_unmapped_ratio", 1262 .data = &sysctl_min_unmapped_ratio, 1263 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1264 .mode = 0644, 1265 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1266 .extra1 = &zero, 1267 .extra2 = &one_hundred, 1268 }, 1269 { 1270 .procname = "min_slab_ratio", 1271 .data = &sysctl_min_slab_ratio, 1272 .maxlen = sizeof(sysctl_min_slab_ratio), 1273 .mode = 0644, 1274 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1275 .extra1 = &zero, 1276 .extra2 = &one_hundred, 1277 }, 1278 #endif 1279 #ifdef CONFIG_SMP 1280 { 1281 .procname = "stat_interval", 1282 .data = &sysctl_stat_interval, 1283 .maxlen = sizeof(sysctl_stat_interval), 1284 .mode = 0644, 1285 .proc_handler = proc_dointvec_jiffies, 1286 }, 1287 #endif 1288 #ifdef CONFIG_MMU 1289 { 1290 .procname = "mmap_min_addr", 1291 .data = &dac_mmap_min_addr, 1292 .maxlen = sizeof(unsigned long), 1293 .mode = 0644, 1294 .proc_handler = mmap_min_addr_handler, 1295 }, 1296 #endif 1297 #ifdef CONFIG_NUMA 1298 { 1299 .procname = "numa_zonelist_order", 1300 .data = &numa_zonelist_order, 1301 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1302 .mode = 0644, 1303 .proc_handler = numa_zonelist_order_handler, 1304 }, 1305 #endif 1306 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1307 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1308 { 1309 .procname = "vdso_enabled", 1310 .data = &vdso_enabled, 1311 .maxlen = sizeof(vdso_enabled), 1312 .mode = 0644, 1313 .proc_handler = proc_dointvec, 1314 .extra1 = &zero, 1315 }, 1316 #endif 1317 #ifdef CONFIG_HIGHMEM 1318 { 1319 .procname = "highmem_is_dirtyable", 1320 .data = &vm_highmem_is_dirtyable, 1321 .maxlen = sizeof(vm_highmem_is_dirtyable), 1322 .mode = 0644, 1323 .proc_handler = proc_dointvec_minmax, 1324 .extra1 = &zero, 1325 .extra2 = &one, 1326 }, 1327 #endif 1328 { 1329 .procname = "scan_unevictable_pages", 1330 .data = &scan_unevictable_pages, 1331 .maxlen = sizeof(scan_unevictable_pages), 1332 .mode = 0644, 1333 .proc_handler = scan_unevictable_handler, 1334 }, 1335 #ifdef CONFIG_MEMORY_FAILURE 1336 { 1337 .procname = "memory_failure_early_kill", 1338 .data = &sysctl_memory_failure_early_kill, 1339 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1340 .mode = 0644, 1341 .proc_handler = proc_dointvec_minmax, 1342 .extra1 = &zero, 1343 .extra2 = &one, 1344 }, 1345 { 1346 .procname = "memory_failure_recovery", 1347 .data = &sysctl_memory_failure_recovery, 1348 .maxlen = sizeof(sysctl_memory_failure_recovery), 1349 .mode = 0644, 1350 .proc_handler = proc_dointvec_minmax, 1351 .extra1 = &zero, 1352 .extra2 = &one, 1353 }, 1354 #endif 1355 { } 1356 }; 1357 1358 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1359 static struct ctl_table binfmt_misc_table[] = { 1360 { } 1361 }; 1362 #endif 1363 1364 static struct ctl_table fs_table[] = { 1365 { 1366 .procname = "inode-nr", 1367 .data = &inodes_stat, 1368 .maxlen = 2*sizeof(int), 1369 .mode = 0444, 1370 .proc_handler = proc_nr_inodes, 1371 }, 1372 { 1373 .procname = "inode-state", 1374 .data = &inodes_stat, 1375 .maxlen = 7*sizeof(int), 1376 .mode = 0444, 1377 .proc_handler = proc_nr_inodes, 1378 }, 1379 { 1380 .procname = "file-nr", 1381 .data = &files_stat, 1382 .maxlen = sizeof(files_stat), 1383 .mode = 0444, 1384 .proc_handler = proc_nr_files, 1385 }, 1386 { 1387 .procname = "file-max", 1388 .data = &files_stat.max_files, 1389 .maxlen = sizeof(files_stat.max_files), 1390 .mode = 0644, 1391 .proc_handler = proc_doulongvec_minmax, 1392 }, 1393 { 1394 .procname = "nr_open", 1395 .data = &sysctl_nr_open, 1396 .maxlen = sizeof(int), 1397 .mode = 0644, 1398 .proc_handler = proc_dointvec_minmax, 1399 .extra1 = &sysctl_nr_open_min, 1400 .extra2 = &sysctl_nr_open_max, 1401 }, 1402 { 1403 .procname = "dentry-state", 1404 .data = &dentry_stat, 1405 .maxlen = 6*sizeof(int), 1406 .mode = 0444, 1407 .proc_handler = proc_nr_dentry, 1408 }, 1409 { 1410 .procname = "overflowuid", 1411 .data = &fs_overflowuid, 1412 .maxlen = sizeof(int), 1413 .mode = 0644, 1414 .proc_handler = proc_dointvec_minmax, 1415 .extra1 = &minolduid, 1416 .extra2 = &maxolduid, 1417 }, 1418 { 1419 .procname = "overflowgid", 1420 .data = &fs_overflowgid, 1421 .maxlen = sizeof(int), 1422 .mode = 0644, 1423 .proc_handler = proc_dointvec_minmax, 1424 .extra1 = &minolduid, 1425 .extra2 = &maxolduid, 1426 }, 1427 #ifdef CONFIG_FILE_LOCKING 1428 { 1429 .procname = "leases-enable", 1430 .data = &leases_enable, 1431 .maxlen = sizeof(int), 1432 .mode = 0644, 1433 .proc_handler = proc_dointvec, 1434 }, 1435 #endif 1436 #ifdef CONFIG_DNOTIFY 1437 { 1438 .procname = "dir-notify-enable", 1439 .data = &dir_notify_enable, 1440 .maxlen = sizeof(int), 1441 .mode = 0644, 1442 .proc_handler = proc_dointvec, 1443 }, 1444 #endif 1445 #ifdef CONFIG_MMU 1446 #ifdef CONFIG_FILE_LOCKING 1447 { 1448 .procname = "lease-break-time", 1449 .data = &lease_break_time, 1450 .maxlen = sizeof(int), 1451 .mode = 0644, 1452 .proc_handler = proc_dointvec, 1453 }, 1454 #endif 1455 #ifdef CONFIG_AIO 1456 { 1457 .procname = "aio-nr", 1458 .data = &aio_nr, 1459 .maxlen = sizeof(aio_nr), 1460 .mode = 0444, 1461 .proc_handler = proc_doulongvec_minmax, 1462 }, 1463 { 1464 .procname = "aio-max-nr", 1465 .data = &aio_max_nr, 1466 .maxlen = sizeof(aio_max_nr), 1467 .mode = 0644, 1468 .proc_handler = proc_doulongvec_minmax, 1469 }, 1470 #endif /* CONFIG_AIO */ 1471 #ifdef CONFIG_INOTIFY_USER 1472 { 1473 .procname = "inotify", 1474 .mode = 0555, 1475 .child = inotify_table, 1476 }, 1477 #endif 1478 #ifdef CONFIG_EPOLL 1479 { 1480 .procname = "epoll", 1481 .mode = 0555, 1482 .child = epoll_table, 1483 }, 1484 #endif 1485 #endif 1486 { 1487 .procname = "suid_dumpable", 1488 .data = &suid_dumpable, 1489 .maxlen = sizeof(int), 1490 .mode = 0644, 1491 .proc_handler = proc_dointvec_minmax, 1492 .extra1 = &zero, 1493 .extra2 = &two, 1494 }, 1495 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1496 { 1497 .procname = "binfmt_misc", 1498 .mode = 0555, 1499 .child = binfmt_misc_table, 1500 }, 1501 #endif 1502 { 1503 .procname = "pipe-max-size", 1504 .data = &pipe_max_size, 1505 .maxlen = sizeof(int), 1506 .mode = 0644, 1507 .proc_handler = &pipe_proc_fn, 1508 .extra1 = &pipe_min_size, 1509 }, 1510 { } 1511 }; 1512 1513 static struct ctl_table debug_table[] = { 1514 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1515 defined(CONFIG_S390) || defined(CONFIG_TILE) 1516 { 1517 .procname = "exception-trace", 1518 .data = &show_unhandled_signals, 1519 .maxlen = sizeof(int), 1520 .mode = 0644, 1521 .proc_handler = proc_dointvec 1522 }, 1523 #endif 1524 #if defined(CONFIG_OPTPROBES) 1525 { 1526 .procname = "kprobes-optimization", 1527 .data = &sysctl_kprobes_optimization, 1528 .maxlen = sizeof(int), 1529 .mode = 0644, 1530 .proc_handler = proc_kprobes_optimization_handler, 1531 .extra1 = &zero, 1532 .extra2 = &one, 1533 }, 1534 #endif 1535 { } 1536 }; 1537 1538 static struct ctl_table dev_table[] = { 1539 { } 1540 }; 1541 1542 static DEFINE_SPINLOCK(sysctl_lock); 1543 1544 /* called under sysctl_lock */ 1545 static int use_table(struct ctl_table_header *p) 1546 { 1547 if (unlikely(p->unregistering)) 1548 return 0; 1549 p->used++; 1550 return 1; 1551 } 1552 1553 /* called under sysctl_lock */ 1554 static void unuse_table(struct ctl_table_header *p) 1555 { 1556 if (!--p->used) 1557 if (unlikely(p->unregistering)) 1558 complete(p->unregistering); 1559 } 1560 1561 /* called under sysctl_lock, will reacquire if has to wait */ 1562 static void start_unregistering(struct ctl_table_header *p) 1563 { 1564 /* 1565 * if p->used is 0, nobody will ever touch that entry again; 1566 * we'll eliminate all paths to it before dropping sysctl_lock 1567 */ 1568 if (unlikely(p->used)) { 1569 struct completion wait; 1570 init_completion(&wait); 1571 p->unregistering = &wait; 1572 spin_unlock(&sysctl_lock); 1573 wait_for_completion(&wait); 1574 spin_lock(&sysctl_lock); 1575 } else { 1576 /* anything non-NULL; we'll never dereference it */ 1577 p->unregistering = ERR_PTR(-EINVAL); 1578 } 1579 /* 1580 * do not remove from the list until nobody holds it; walking the 1581 * list in do_sysctl() relies on that. 1582 */ 1583 list_del_init(&p->ctl_entry); 1584 } 1585 1586 void sysctl_head_get(struct ctl_table_header *head) 1587 { 1588 spin_lock(&sysctl_lock); 1589 head->count++; 1590 spin_unlock(&sysctl_lock); 1591 } 1592 1593 static void free_head(struct rcu_head *rcu) 1594 { 1595 kfree(container_of(rcu, struct ctl_table_header, rcu)); 1596 } 1597 1598 void sysctl_head_put(struct ctl_table_header *head) 1599 { 1600 spin_lock(&sysctl_lock); 1601 if (!--head->count) 1602 call_rcu(&head->rcu, free_head); 1603 spin_unlock(&sysctl_lock); 1604 } 1605 1606 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1607 { 1608 if (!head) 1609 BUG(); 1610 spin_lock(&sysctl_lock); 1611 if (!use_table(head)) 1612 head = ERR_PTR(-ENOENT); 1613 spin_unlock(&sysctl_lock); 1614 return head; 1615 } 1616 1617 void sysctl_head_finish(struct ctl_table_header *head) 1618 { 1619 if (!head) 1620 return; 1621 spin_lock(&sysctl_lock); 1622 unuse_table(head); 1623 spin_unlock(&sysctl_lock); 1624 } 1625 1626 static struct ctl_table_set * 1627 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1628 { 1629 struct ctl_table_set *set = &root->default_set; 1630 if (root->lookup) 1631 set = root->lookup(root, namespaces); 1632 return set; 1633 } 1634 1635 static struct list_head * 1636 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1637 { 1638 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1639 return &set->list; 1640 } 1641 1642 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1643 struct ctl_table_header *prev) 1644 { 1645 struct ctl_table_root *root; 1646 struct list_head *header_list; 1647 struct ctl_table_header *head; 1648 struct list_head *tmp; 1649 1650 spin_lock(&sysctl_lock); 1651 if (prev) { 1652 head = prev; 1653 tmp = &prev->ctl_entry; 1654 unuse_table(prev); 1655 goto next; 1656 } 1657 tmp = &root_table_header.ctl_entry; 1658 for (;;) { 1659 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1660 1661 if (!use_table(head)) 1662 goto next; 1663 spin_unlock(&sysctl_lock); 1664 return head; 1665 next: 1666 root = head->root; 1667 tmp = tmp->next; 1668 header_list = lookup_header_list(root, namespaces); 1669 if (tmp != header_list) 1670 continue; 1671 1672 do { 1673 root = list_entry(root->root_list.next, 1674 struct ctl_table_root, root_list); 1675 if (root == &sysctl_table_root) 1676 goto out; 1677 header_list = lookup_header_list(root, namespaces); 1678 } while (list_empty(header_list)); 1679 tmp = header_list->next; 1680 } 1681 out: 1682 spin_unlock(&sysctl_lock); 1683 return NULL; 1684 } 1685 1686 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1687 { 1688 return __sysctl_head_next(current->nsproxy, prev); 1689 } 1690 1691 void register_sysctl_root(struct ctl_table_root *root) 1692 { 1693 spin_lock(&sysctl_lock); 1694 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1695 spin_unlock(&sysctl_lock); 1696 } 1697 1698 /* 1699 * sysctl_perm does NOT grant the superuser all rights automatically, because 1700 * some sysctl variables are readonly even to root. 1701 */ 1702 1703 static int test_perm(int mode, int op) 1704 { 1705 if (!current_euid()) 1706 mode >>= 6; 1707 else if (in_egroup_p(0)) 1708 mode >>= 3; 1709 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1710 return 0; 1711 return -EACCES; 1712 } 1713 1714 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1715 { 1716 int mode; 1717 1718 if (root->permissions) 1719 mode = root->permissions(root, current->nsproxy, table); 1720 else 1721 mode = table->mode; 1722 1723 return test_perm(mode, op); 1724 } 1725 1726 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1727 { 1728 for (; table->procname; table++) { 1729 table->parent = parent; 1730 if (table->child) 1731 sysctl_set_parent(table, table->child); 1732 } 1733 } 1734 1735 static __init int sysctl_init(void) 1736 { 1737 sysctl_set_parent(NULL, root_table); 1738 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1739 sysctl_check_table(current->nsproxy, root_table); 1740 #endif 1741 return 0; 1742 } 1743 1744 core_initcall(sysctl_init); 1745 1746 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1747 struct ctl_table *table) 1748 { 1749 struct ctl_table *p; 1750 const char *s = branch->procname; 1751 1752 /* branch should have named subdirectory as its first element */ 1753 if (!s || !branch->child) 1754 return NULL; 1755 1756 /* ... and nothing else */ 1757 if (branch[1].procname) 1758 return NULL; 1759 1760 /* table should contain subdirectory with the same name */ 1761 for (p = table; p->procname; p++) { 1762 if (!p->child) 1763 continue; 1764 if (p->procname && strcmp(p->procname, s) == 0) 1765 return p; 1766 } 1767 return NULL; 1768 } 1769 1770 /* see if attaching q to p would be an improvement */ 1771 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1772 { 1773 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1774 struct ctl_table *next; 1775 int is_better = 0; 1776 int not_in_parent = !p->attached_by; 1777 1778 while ((next = is_branch_in(by, to)) != NULL) { 1779 if (by == q->attached_by) 1780 is_better = 1; 1781 if (to == p->attached_by) 1782 not_in_parent = 1; 1783 by = by->child; 1784 to = next->child; 1785 } 1786 1787 if (is_better && not_in_parent) { 1788 q->attached_by = by; 1789 q->attached_to = to; 1790 q->parent = p; 1791 } 1792 } 1793 1794 /** 1795 * __register_sysctl_paths - register a sysctl hierarchy 1796 * @root: List of sysctl headers to register on 1797 * @namespaces: Data to compute which lists of sysctl entries are visible 1798 * @path: The path to the directory the sysctl table is in. 1799 * @table: the top-level table structure 1800 * 1801 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1802 * array. A completely 0 filled entry terminates the table. 1803 * 1804 * The members of the &struct ctl_table structure are used as follows: 1805 * 1806 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1807 * enter a sysctl file 1808 * 1809 * data - a pointer to data for use by proc_handler 1810 * 1811 * maxlen - the maximum size in bytes of the data 1812 * 1813 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1814 * 1815 * child - a pointer to the child sysctl table if this entry is a directory, or 1816 * %NULL. 1817 * 1818 * proc_handler - the text handler routine (described below) 1819 * 1820 * de - for internal use by the sysctl routines 1821 * 1822 * extra1, extra2 - extra pointers usable by the proc handler routines 1823 * 1824 * Leaf nodes in the sysctl tree will be represented by a single file 1825 * under /proc; non-leaf nodes will be represented by directories. 1826 * 1827 * sysctl(2) can automatically manage read and write requests through 1828 * the sysctl table. The data and maxlen fields of the ctl_table 1829 * struct enable minimal validation of the values being written to be 1830 * performed, and the mode field allows minimal authentication. 1831 * 1832 * There must be a proc_handler routine for any terminal nodes 1833 * mirrored under /proc/sys (non-terminals are handled by a built-in 1834 * directory handler). Several default handlers are available to 1835 * cover common cases - 1836 * 1837 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1838 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1839 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1840 * 1841 * It is the handler's job to read the input buffer from user memory 1842 * and process it. The handler should return 0 on success. 1843 * 1844 * This routine returns %NULL on a failure to register, and a pointer 1845 * to the table header on success. 1846 */ 1847 struct ctl_table_header *__register_sysctl_paths( 1848 struct ctl_table_root *root, 1849 struct nsproxy *namespaces, 1850 const struct ctl_path *path, struct ctl_table *table) 1851 { 1852 struct ctl_table_header *header; 1853 struct ctl_table *new, **prevp; 1854 unsigned int n, npath; 1855 struct ctl_table_set *set; 1856 1857 /* Count the path components */ 1858 for (npath = 0; path[npath].procname; ++npath) 1859 ; 1860 1861 /* 1862 * For each path component, allocate a 2-element ctl_table array. 1863 * The first array element will be filled with the sysctl entry 1864 * for this, the second will be the sentinel (procname == 0). 1865 * 1866 * We allocate everything in one go so that we don't have to 1867 * worry about freeing additional memory in unregister_sysctl_table. 1868 */ 1869 header = kzalloc(sizeof(struct ctl_table_header) + 1870 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1871 if (!header) 1872 return NULL; 1873 1874 new = (struct ctl_table *) (header + 1); 1875 1876 /* Now connect the dots */ 1877 prevp = &header->ctl_table; 1878 for (n = 0; n < npath; ++n, ++path) { 1879 /* Copy the procname */ 1880 new->procname = path->procname; 1881 new->mode = 0555; 1882 1883 *prevp = new; 1884 prevp = &new->child; 1885 1886 new += 2; 1887 } 1888 *prevp = table; 1889 header->ctl_table_arg = table; 1890 1891 INIT_LIST_HEAD(&header->ctl_entry); 1892 header->used = 0; 1893 header->unregistering = NULL; 1894 header->root = root; 1895 sysctl_set_parent(NULL, header->ctl_table); 1896 header->count = 1; 1897 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1898 if (sysctl_check_table(namespaces, header->ctl_table)) { 1899 kfree(header); 1900 return NULL; 1901 } 1902 #endif 1903 spin_lock(&sysctl_lock); 1904 header->set = lookup_header_set(root, namespaces); 1905 header->attached_by = header->ctl_table; 1906 header->attached_to = root_table; 1907 header->parent = &root_table_header; 1908 for (set = header->set; set; set = set->parent) { 1909 struct ctl_table_header *p; 1910 list_for_each_entry(p, &set->list, ctl_entry) { 1911 if (p->unregistering) 1912 continue; 1913 try_attach(p, header); 1914 } 1915 } 1916 header->parent->count++; 1917 list_add_tail(&header->ctl_entry, &header->set->list); 1918 spin_unlock(&sysctl_lock); 1919 1920 return header; 1921 } 1922 1923 /** 1924 * register_sysctl_table_path - register a sysctl table hierarchy 1925 * @path: The path to the directory the sysctl table is in. 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_paths(const struct ctl_path *path, 1934 struct ctl_table *table) 1935 { 1936 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1937 path, table); 1938 } 1939 1940 /** 1941 * register_sysctl_table - register a sysctl table hierarchy 1942 * @table: the top-level table structure 1943 * 1944 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1945 * array. A completely 0 filled entry terminates the table. 1946 * 1947 * See register_sysctl_paths for more details. 1948 */ 1949 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1950 { 1951 static const struct ctl_path null_path[] = { {} }; 1952 1953 return register_sysctl_paths(null_path, table); 1954 } 1955 1956 /** 1957 * unregister_sysctl_table - unregister a sysctl table hierarchy 1958 * @header: the header returned from register_sysctl_table 1959 * 1960 * Unregisters the sysctl table and all children. proc entries may not 1961 * actually be removed until they are no longer used by anyone. 1962 */ 1963 void unregister_sysctl_table(struct ctl_table_header * header) 1964 { 1965 might_sleep(); 1966 1967 if (header == NULL) 1968 return; 1969 1970 spin_lock(&sysctl_lock); 1971 start_unregistering(header); 1972 if (!--header->parent->count) { 1973 WARN_ON(1); 1974 call_rcu(&header->parent->rcu, free_head); 1975 } 1976 if (!--header->count) 1977 call_rcu(&header->rcu, free_head); 1978 spin_unlock(&sysctl_lock); 1979 } 1980 1981 int sysctl_is_seen(struct ctl_table_header *p) 1982 { 1983 struct ctl_table_set *set = p->set; 1984 int res; 1985 spin_lock(&sysctl_lock); 1986 if (p->unregistering) 1987 res = 0; 1988 else if (!set->is_seen) 1989 res = 1; 1990 else 1991 res = set->is_seen(set); 1992 spin_unlock(&sysctl_lock); 1993 return res; 1994 } 1995 1996 void setup_sysctl_set(struct ctl_table_set *p, 1997 struct ctl_table_set *parent, 1998 int (*is_seen)(struct ctl_table_set *)) 1999 { 2000 INIT_LIST_HEAD(&p->list); 2001 p->parent = parent ? parent : &sysctl_table_root.default_set; 2002 p->is_seen = is_seen; 2003 } 2004 2005 #else /* !CONFIG_SYSCTL */ 2006 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2007 { 2008 return NULL; 2009 } 2010 2011 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2012 struct ctl_table *table) 2013 { 2014 return NULL; 2015 } 2016 2017 void unregister_sysctl_table(struct ctl_table_header * table) 2018 { 2019 } 2020 2021 void setup_sysctl_set(struct ctl_table_set *p, 2022 struct ctl_table_set *parent, 2023 int (*is_seen)(struct ctl_table_set *)) 2024 { 2025 } 2026 2027 void sysctl_head_put(struct ctl_table_header *head) 2028 { 2029 } 2030 2031 #endif /* CONFIG_SYSCTL */ 2032 2033 /* 2034 * /proc/sys support 2035 */ 2036 2037 #ifdef CONFIG_PROC_SYSCTL 2038 2039 static int _proc_do_string(void* data, int maxlen, int write, 2040 void __user *buffer, 2041 size_t *lenp, loff_t *ppos) 2042 { 2043 size_t len; 2044 char __user *p; 2045 char c; 2046 2047 if (!data || !maxlen || !*lenp) { 2048 *lenp = 0; 2049 return 0; 2050 } 2051 2052 if (write) { 2053 len = 0; 2054 p = buffer; 2055 while (len < *lenp) { 2056 if (get_user(c, p++)) 2057 return -EFAULT; 2058 if (c == 0 || c == '\n') 2059 break; 2060 len++; 2061 } 2062 if (len >= maxlen) 2063 len = maxlen-1; 2064 if(copy_from_user(data, buffer, len)) 2065 return -EFAULT; 2066 ((char *) data)[len] = 0; 2067 *ppos += *lenp; 2068 } else { 2069 len = strlen(data); 2070 if (len > maxlen) 2071 len = maxlen; 2072 2073 if (*ppos > len) { 2074 *lenp = 0; 2075 return 0; 2076 } 2077 2078 data += *ppos; 2079 len -= *ppos; 2080 2081 if (len > *lenp) 2082 len = *lenp; 2083 if (len) 2084 if(copy_to_user(buffer, data, len)) 2085 return -EFAULT; 2086 if (len < *lenp) { 2087 if(put_user('\n', ((char __user *) buffer) + len)) 2088 return -EFAULT; 2089 len++; 2090 } 2091 *lenp = len; 2092 *ppos += len; 2093 } 2094 return 0; 2095 } 2096 2097 /** 2098 * proc_dostring - read a string sysctl 2099 * @table: the sysctl table 2100 * @write: %TRUE if this is a write to the sysctl file 2101 * @buffer: the user buffer 2102 * @lenp: the size of the user buffer 2103 * @ppos: file position 2104 * 2105 * Reads/writes a string from/to the user buffer. If the kernel 2106 * buffer provided is not large enough to hold the string, the 2107 * string is truncated. The copied string is %NULL-terminated. 2108 * If the string is being read by the user process, it is copied 2109 * and a newline '\n' is added. It is truncated if the buffer is 2110 * not large enough. 2111 * 2112 * Returns 0 on success. 2113 */ 2114 int proc_dostring(struct ctl_table *table, int write, 2115 void __user *buffer, size_t *lenp, loff_t *ppos) 2116 { 2117 return _proc_do_string(table->data, table->maxlen, write, 2118 buffer, lenp, ppos); 2119 } 2120 2121 static size_t proc_skip_spaces(char **buf) 2122 { 2123 size_t ret; 2124 char *tmp = skip_spaces(*buf); 2125 ret = tmp - *buf; 2126 *buf = tmp; 2127 return ret; 2128 } 2129 2130 static void proc_skip_char(char **buf, size_t *size, const char v) 2131 { 2132 while (*size) { 2133 if (**buf != v) 2134 break; 2135 (*size)--; 2136 (*buf)++; 2137 } 2138 } 2139 2140 #define TMPBUFLEN 22 2141 /** 2142 * proc_get_long - reads an ASCII formatted integer from a user buffer 2143 * 2144 * @buf: a kernel buffer 2145 * @size: size of the kernel buffer 2146 * @val: this is where the number will be stored 2147 * @neg: set to %TRUE if number is negative 2148 * @perm_tr: a vector which contains the allowed trailers 2149 * @perm_tr_len: size of the perm_tr vector 2150 * @tr: pointer to store the trailer character 2151 * 2152 * In case of success %0 is returned and @buf and @size are updated with 2153 * the amount of bytes read. If @tr is non-NULL and a trailing 2154 * character exists (size is non-zero after returning from this 2155 * function), @tr is updated with the trailing character. 2156 */ 2157 static int proc_get_long(char **buf, size_t *size, 2158 unsigned long *val, bool *neg, 2159 const char *perm_tr, unsigned perm_tr_len, char *tr) 2160 { 2161 int len; 2162 char *p, tmp[TMPBUFLEN]; 2163 2164 if (!*size) 2165 return -EINVAL; 2166 2167 len = *size; 2168 if (len > TMPBUFLEN - 1) 2169 len = TMPBUFLEN - 1; 2170 2171 memcpy(tmp, *buf, len); 2172 2173 tmp[len] = 0; 2174 p = tmp; 2175 if (*p == '-' && *size > 1) { 2176 *neg = true; 2177 p++; 2178 } else 2179 *neg = false; 2180 if (!isdigit(*p)) 2181 return -EINVAL; 2182 2183 *val = simple_strtoul(p, &p, 0); 2184 2185 len = p - tmp; 2186 2187 /* We don't know if the next char is whitespace thus we may accept 2188 * invalid integers (e.g. 1234...a) or two integers instead of one 2189 * (e.g. 123...1). So lets not allow such large numbers. */ 2190 if (len == TMPBUFLEN - 1) 2191 return -EINVAL; 2192 2193 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2194 return -EINVAL; 2195 2196 if (tr && (len < *size)) 2197 *tr = *p; 2198 2199 *buf += len; 2200 *size -= len; 2201 2202 return 0; 2203 } 2204 2205 /** 2206 * proc_put_long - converts an integer to a decimal ASCII formatted string 2207 * 2208 * @buf: the user buffer 2209 * @size: the size of the user buffer 2210 * @val: the integer to be converted 2211 * @neg: sign of the number, %TRUE for negative 2212 * 2213 * In case of success %0 is returned and @buf and @size are updated with 2214 * the amount of bytes written. 2215 */ 2216 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2217 bool neg) 2218 { 2219 int len; 2220 char tmp[TMPBUFLEN], *p = tmp; 2221 2222 sprintf(p, "%s%lu", neg ? "-" : "", val); 2223 len = strlen(tmp); 2224 if (len > *size) 2225 len = *size; 2226 if (copy_to_user(*buf, tmp, len)) 2227 return -EFAULT; 2228 *size -= len; 2229 *buf += len; 2230 return 0; 2231 } 2232 #undef TMPBUFLEN 2233 2234 static int proc_put_char(void __user **buf, size_t *size, char c) 2235 { 2236 if (*size) { 2237 char __user **buffer = (char __user **)buf; 2238 if (put_user(c, *buffer)) 2239 return -EFAULT; 2240 (*size)--, (*buffer)++; 2241 *buf = *buffer; 2242 } 2243 return 0; 2244 } 2245 2246 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2247 int *valp, 2248 int write, void *data) 2249 { 2250 if (write) { 2251 *valp = *negp ? -*lvalp : *lvalp; 2252 } else { 2253 int val = *valp; 2254 if (val < 0) { 2255 *negp = true; 2256 *lvalp = (unsigned long)-val; 2257 } else { 2258 *negp = false; 2259 *lvalp = (unsigned long)val; 2260 } 2261 } 2262 return 0; 2263 } 2264 2265 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2266 2267 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2268 int write, void __user *buffer, 2269 size_t *lenp, loff_t *ppos, 2270 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2271 int write, void *data), 2272 void *data) 2273 { 2274 int *i, vleft, first = 1, err = 0; 2275 unsigned long page = 0; 2276 size_t left; 2277 char *kbuf; 2278 2279 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2280 *lenp = 0; 2281 return 0; 2282 } 2283 2284 i = (int *) tbl_data; 2285 vleft = table->maxlen / sizeof(*i); 2286 left = *lenp; 2287 2288 if (!conv) 2289 conv = do_proc_dointvec_conv; 2290 2291 if (write) { 2292 if (left > PAGE_SIZE - 1) 2293 left = PAGE_SIZE - 1; 2294 page = __get_free_page(GFP_TEMPORARY); 2295 kbuf = (char *) page; 2296 if (!kbuf) 2297 return -ENOMEM; 2298 if (copy_from_user(kbuf, buffer, left)) { 2299 err = -EFAULT; 2300 goto free; 2301 } 2302 kbuf[left] = 0; 2303 } 2304 2305 for (; left && vleft--; i++, first=0) { 2306 unsigned long lval; 2307 bool neg; 2308 2309 if (write) { 2310 left -= proc_skip_spaces(&kbuf); 2311 2312 if (!left) 2313 break; 2314 err = proc_get_long(&kbuf, &left, &lval, &neg, 2315 proc_wspace_sep, 2316 sizeof(proc_wspace_sep), NULL); 2317 if (err) 2318 break; 2319 if (conv(&neg, &lval, i, 1, data)) { 2320 err = -EINVAL; 2321 break; 2322 } 2323 } else { 2324 if (conv(&neg, &lval, i, 0, data)) { 2325 err = -EINVAL; 2326 break; 2327 } 2328 if (!first) 2329 err = proc_put_char(&buffer, &left, '\t'); 2330 if (err) 2331 break; 2332 err = proc_put_long(&buffer, &left, lval, neg); 2333 if (err) 2334 break; 2335 } 2336 } 2337 2338 if (!write && !first && left && !err) 2339 err = proc_put_char(&buffer, &left, '\n'); 2340 if (write && !err && left) 2341 left -= proc_skip_spaces(&kbuf); 2342 free: 2343 if (write) { 2344 free_page(page); 2345 if (first) 2346 return err ? : -EINVAL; 2347 } 2348 *lenp -= left; 2349 *ppos += *lenp; 2350 return err; 2351 } 2352 2353 static int do_proc_dointvec(struct ctl_table *table, int write, 2354 void __user *buffer, size_t *lenp, loff_t *ppos, 2355 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2356 int write, void *data), 2357 void *data) 2358 { 2359 return __do_proc_dointvec(table->data, table, write, 2360 buffer, lenp, ppos, conv, data); 2361 } 2362 2363 /** 2364 * proc_dointvec - read a vector of integers 2365 * @table: the sysctl table 2366 * @write: %TRUE if this is a write to the sysctl file 2367 * @buffer: the user buffer 2368 * @lenp: the size of the user buffer 2369 * @ppos: file position 2370 * 2371 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2372 * values from/to the user buffer, treated as an ASCII string. 2373 * 2374 * Returns 0 on success. 2375 */ 2376 int proc_dointvec(struct ctl_table *table, int write, 2377 void __user *buffer, size_t *lenp, loff_t *ppos) 2378 { 2379 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2380 NULL,NULL); 2381 } 2382 2383 /* 2384 * Taint values can only be increased 2385 * This means we can safely use a temporary. 2386 */ 2387 static int proc_taint(struct ctl_table *table, int write, 2388 void __user *buffer, size_t *lenp, loff_t *ppos) 2389 { 2390 struct ctl_table t; 2391 unsigned long tmptaint = get_taint(); 2392 int err; 2393 2394 if (write && !capable(CAP_SYS_ADMIN)) 2395 return -EPERM; 2396 2397 t = *table; 2398 t.data = &tmptaint; 2399 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2400 if (err < 0) 2401 return err; 2402 2403 if (write) { 2404 /* 2405 * Poor man's atomic or. Not worth adding a primitive 2406 * to everyone's atomic.h for this 2407 */ 2408 int i; 2409 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2410 if ((tmptaint >> i) & 1) 2411 add_taint(i); 2412 } 2413 } 2414 2415 return err; 2416 } 2417 2418 #ifdef CONFIG_PRINTK 2419 static int proc_dmesg_restrict(struct ctl_table *table, int write, 2420 void __user *buffer, size_t *lenp, loff_t *ppos) 2421 { 2422 if (write && !capable(CAP_SYS_ADMIN)) 2423 return -EPERM; 2424 2425 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2426 } 2427 #endif 2428 2429 struct do_proc_dointvec_minmax_conv_param { 2430 int *min; 2431 int *max; 2432 }; 2433 2434 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2435 int *valp, 2436 int write, void *data) 2437 { 2438 struct do_proc_dointvec_minmax_conv_param *param = data; 2439 if (write) { 2440 int val = *negp ? -*lvalp : *lvalp; 2441 if ((param->min && *param->min > val) || 2442 (param->max && *param->max < val)) 2443 return -EINVAL; 2444 *valp = val; 2445 } else { 2446 int val = *valp; 2447 if (val < 0) { 2448 *negp = true; 2449 *lvalp = (unsigned long)-val; 2450 } else { 2451 *negp = false; 2452 *lvalp = (unsigned long)val; 2453 } 2454 } 2455 return 0; 2456 } 2457 2458 /** 2459 * proc_dointvec_minmax - read a vector of integers with min/max values 2460 * @table: the sysctl table 2461 * @write: %TRUE if this is a write to the sysctl file 2462 * @buffer: the user buffer 2463 * @lenp: the size of the user buffer 2464 * @ppos: file position 2465 * 2466 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2467 * values from/to the user buffer, treated as an ASCII string. 2468 * 2469 * This routine will ensure the values are within the range specified by 2470 * table->extra1 (min) and table->extra2 (max). 2471 * 2472 * Returns 0 on success. 2473 */ 2474 int proc_dointvec_minmax(struct ctl_table *table, int write, 2475 void __user *buffer, size_t *lenp, loff_t *ppos) 2476 { 2477 struct do_proc_dointvec_minmax_conv_param param = { 2478 .min = (int *) table->extra1, 2479 .max = (int *) table->extra2, 2480 }; 2481 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2482 do_proc_dointvec_minmax_conv, ¶m); 2483 } 2484 2485 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2486 void __user *buffer, 2487 size_t *lenp, loff_t *ppos, 2488 unsigned long convmul, 2489 unsigned long convdiv) 2490 { 2491 unsigned long *i, *min, *max; 2492 int vleft, first = 1, err = 0; 2493 unsigned long page = 0; 2494 size_t left; 2495 char *kbuf; 2496 2497 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2498 *lenp = 0; 2499 return 0; 2500 } 2501 2502 i = (unsigned long *) data; 2503 min = (unsigned long *) table->extra1; 2504 max = (unsigned long *) table->extra2; 2505 vleft = table->maxlen / sizeof(unsigned long); 2506 left = *lenp; 2507 2508 if (write) { 2509 if (left > PAGE_SIZE - 1) 2510 left = PAGE_SIZE - 1; 2511 page = __get_free_page(GFP_TEMPORARY); 2512 kbuf = (char *) page; 2513 if (!kbuf) 2514 return -ENOMEM; 2515 if (copy_from_user(kbuf, buffer, left)) { 2516 err = -EFAULT; 2517 goto free; 2518 } 2519 kbuf[left] = 0; 2520 } 2521 2522 for (; left && vleft--; i++, first = 0) { 2523 unsigned long val; 2524 2525 if (write) { 2526 bool neg; 2527 2528 left -= proc_skip_spaces(&kbuf); 2529 2530 err = proc_get_long(&kbuf, &left, &val, &neg, 2531 proc_wspace_sep, 2532 sizeof(proc_wspace_sep), NULL); 2533 if (err) 2534 break; 2535 if (neg) 2536 continue; 2537 if ((min && val < *min) || (max && val > *max)) 2538 continue; 2539 *i = val; 2540 } else { 2541 val = convdiv * (*i) / convmul; 2542 if (!first) 2543 err = proc_put_char(&buffer, &left, '\t'); 2544 err = proc_put_long(&buffer, &left, val, false); 2545 if (err) 2546 break; 2547 } 2548 } 2549 2550 if (!write && !first && left && !err) 2551 err = proc_put_char(&buffer, &left, '\n'); 2552 if (write && !err) 2553 left -= proc_skip_spaces(&kbuf); 2554 free: 2555 if (write) { 2556 free_page(page); 2557 if (first) 2558 return err ? : -EINVAL; 2559 } 2560 *lenp -= left; 2561 *ppos += *lenp; 2562 return err; 2563 } 2564 2565 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2566 void __user *buffer, 2567 size_t *lenp, loff_t *ppos, 2568 unsigned long convmul, 2569 unsigned long convdiv) 2570 { 2571 return __do_proc_doulongvec_minmax(table->data, table, write, 2572 buffer, lenp, ppos, convmul, convdiv); 2573 } 2574 2575 /** 2576 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2577 * @table: the sysctl table 2578 * @write: %TRUE if this is a write to the sysctl file 2579 * @buffer: the user buffer 2580 * @lenp: the size of the user buffer 2581 * @ppos: file position 2582 * 2583 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2584 * values from/to the user buffer, treated as an ASCII string. 2585 * 2586 * This routine will ensure the values are within the range specified by 2587 * table->extra1 (min) and table->extra2 (max). 2588 * 2589 * Returns 0 on success. 2590 */ 2591 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2592 void __user *buffer, size_t *lenp, loff_t *ppos) 2593 { 2594 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2595 } 2596 2597 /** 2598 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2599 * @table: the sysctl table 2600 * @write: %TRUE if this is a write to the sysctl file 2601 * @buffer: the user buffer 2602 * @lenp: the size of the user buffer 2603 * @ppos: file position 2604 * 2605 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2606 * values from/to the user buffer, treated as an ASCII string. The values 2607 * are treated as milliseconds, and converted to jiffies when they are stored. 2608 * 2609 * This routine will ensure the values are within the range specified by 2610 * table->extra1 (min) and table->extra2 (max). 2611 * 2612 * Returns 0 on success. 2613 */ 2614 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2615 void __user *buffer, 2616 size_t *lenp, loff_t *ppos) 2617 { 2618 return do_proc_doulongvec_minmax(table, write, buffer, 2619 lenp, ppos, HZ, 1000l); 2620 } 2621 2622 2623 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2624 int *valp, 2625 int write, void *data) 2626 { 2627 if (write) { 2628 if (*lvalp > LONG_MAX / HZ) 2629 return 1; 2630 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2631 } else { 2632 int val = *valp; 2633 unsigned long lval; 2634 if (val < 0) { 2635 *negp = true; 2636 lval = (unsigned long)-val; 2637 } else { 2638 *negp = false; 2639 lval = (unsigned long)val; 2640 } 2641 *lvalp = lval / HZ; 2642 } 2643 return 0; 2644 } 2645 2646 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2647 int *valp, 2648 int write, void *data) 2649 { 2650 if (write) { 2651 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2652 return 1; 2653 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2654 } else { 2655 int val = *valp; 2656 unsigned long lval; 2657 if (val < 0) { 2658 *negp = true; 2659 lval = (unsigned long)-val; 2660 } else { 2661 *negp = false; 2662 lval = (unsigned long)val; 2663 } 2664 *lvalp = jiffies_to_clock_t(lval); 2665 } 2666 return 0; 2667 } 2668 2669 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2670 int *valp, 2671 int write, void *data) 2672 { 2673 if (write) { 2674 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2675 } else { 2676 int val = *valp; 2677 unsigned long lval; 2678 if (val < 0) { 2679 *negp = true; 2680 lval = (unsigned long)-val; 2681 } else { 2682 *negp = false; 2683 lval = (unsigned long)val; 2684 } 2685 *lvalp = jiffies_to_msecs(lval); 2686 } 2687 return 0; 2688 } 2689 2690 /** 2691 * proc_dointvec_jiffies - read a vector of integers as seconds 2692 * @table: the sysctl table 2693 * @write: %TRUE if this is a write to the sysctl file 2694 * @buffer: the user buffer 2695 * @lenp: the size of the user buffer 2696 * @ppos: file position 2697 * 2698 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2699 * values from/to the user buffer, treated as an ASCII string. 2700 * The values read are assumed to be in seconds, and are converted into 2701 * jiffies. 2702 * 2703 * Returns 0 on success. 2704 */ 2705 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2706 void __user *buffer, size_t *lenp, loff_t *ppos) 2707 { 2708 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2709 do_proc_dointvec_jiffies_conv,NULL); 2710 } 2711 2712 /** 2713 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2714 * @table: the sysctl table 2715 * @write: %TRUE if this is a write to the sysctl file 2716 * @buffer: the user buffer 2717 * @lenp: the size of the user buffer 2718 * @ppos: pointer to the file position 2719 * 2720 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2721 * values from/to the user buffer, treated as an ASCII string. 2722 * The values read are assumed to be in 1/USER_HZ seconds, and 2723 * are converted into jiffies. 2724 * 2725 * Returns 0 on success. 2726 */ 2727 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2728 void __user *buffer, size_t *lenp, loff_t *ppos) 2729 { 2730 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2731 do_proc_dointvec_userhz_jiffies_conv,NULL); 2732 } 2733 2734 /** 2735 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2736 * @table: the sysctl table 2737 * @write: %TRUE if this is a write to the sysctl file 2738 * @buffer: the user buffer 2739 * @lenp: the size of the user buffer 2740 * @ppos: file position 2741 * @ppos: the current position in the file 2742 * 2743 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2744 * values from/to the user buffer, treated as an ASCII string. 2745 * The values read are assumed to be in 1/1000 seconds, and 2746 * are converted into jiffies. 2747 * 2748 * Returns 0 on success. 2749 */ 2750 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2751 void __user *buffer, size_t *lenp, loff_t *ppos) 2752 { 2753 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2754 do_proc_dointvec_ms_jiffies_conv, NULL); 2755 } 2756 2757 static int proc_do_cad_pid(struct ctl_table *table, int write, 2758 void __user *buffer, size_t *lenp, loff_t *ppos) 2759 { 2760 struct pid *new_pid; 2761 pid_t tmp; 2762 int r; 2763 2764 tmp = pid_vnr(cad_pid); 2765 2766 r = __do_proc_dointvec(&tmp, table, write, buffer, 2767 lenp, ppos, NULL, NULL); 2768 if (r || !write) 2769 return r; 2770 2771 new_pid = find_get_pid(tmp); 2772 if (!new_pid) 2773 return -ESRCH; 2774 2775 put_pid(xchg(&cad_pid, new_pid)); 2776 return 0; 2777 } 2778 2779 /** 2780 * proc_do_large_bitmap - read/write from/to a large bitmap 2781 * @table: the sysctl table 2782 * @write: %TRUE if this is a write to the sysctl file 2783 * @buffer: the user buffer 2784 * @lenp: the size of the user buffer 2785 * @ppos: file position 2786 * 2787 * The bitmap is stored at table->data and the bitmap length (in bits) 2788 * in table->maxlen. 2789 * 2790 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2791 * large bitmaps may be represented in a compact manner. Writing into 2792 * the file will clear the bitmap then update it with the given input. 2793 * 2794 * Returns 0 on success. 2795 */ 2796 int proc_do_large_bitmap(struct ctl_table *table, int write, 2797 void __user *buffer, size_t *lenp, loff_t *ppos) 2798 { 2799 int err = 0; 2800 bool first = 1; 2801 size_t left = *lenp; 2802 unsigned long bitmap_len = table->maxlen; 2803 unsigned long *bitmap = (unsigned long *) table->data; 2804 unsigned long *tmp_bitmap = NULL; 2805 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2806 2807 if (!bitmap_len || !left || (*ppos && !write)) { 2808 *lenp = 0; 2809 return 0; 2810 } 2811 2812 if (write) { 2813 unsigned long page = 0; 2814 char *kbuf; 2815 2816 if (left > PAGE_SIZE - 1) 2817 left = PAGE_SIZE - 1; 2818 2819 page = __get_free_page(GFP_TEMPORARY); 2820 kbuf = (char *) page; 2821 if (!kbuf) 2822 return -ENOMEM; 2823 if (copy_from_user(kbuf, buffer, left)) { 2824 free_page(page); 2825 return -EFAULT; 2826 } 2827 kbuf[left] = 0; 2828 2829 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2830 GFP_KERNEL); 2831 if (!tmp_bitmap) { 2832 free_page(page); 2833 return -ENOMEM; 2834 } 2835 proc_skip_char(&kbuf, &left, '\n'); 2836 while (!err && left) { 2837 unsigned long val_a, val_b; 2838 bool neg; 2839 2840 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2841 sizeof(tr_a), &c); 2842 if (err) 2843 break; 2844 if (val_a >= bitmap_len || neg) { 2845 err = -EINVAL; 2846 break; 2847 } 2848 2849 val_b = val_a; 2850 if (left) { 2851 kbuf++; 2852 left--; 2853 } 2854 2855 if (c == '-') { 2856 err = proc_get_long(&kbuf, &left, &val_b, 2857 &neg, tr_b, sizeof(tr_b), 2858 &c); 2859 if (err) 2860 break; 2861 if (val_b >= bitmap_len || neg || 2862 val_a > val_b) { 2863 err = -EINVAL; 2864 break; 2865 } 2866 if (left) { 2867 kbuf++; 2868 left--; 2869 } 2870 } 2871 2872 while (val_a <= val_b) 2873 set_bit(val_a++, tmp_bitmap); 2874 2875 first = 0; 2876 proc_skip_char(&kbuf, &left, '\n'); 2877 } 2878 free_page(page); 2879 } else { 2880 unsigned long bit_a, bit_b = 0; 2881 2882 while (left) { 2883 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2884 if (bit_a >= bitmap_len) 2885 break; 2886 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2887 bit_a + 1) - 1; 2888 2889 if (!first) { 2890 err = proc_put_char(&buffer, &left, ','); 2891 if (err) 2892 break; 2893 } 2894 err = proc_put_long(&buffer, &left, bit_a, false); 2895 if (err) 2896 break; 2897 if (bit_a != bit_b) { 2898 err = proc_put_char(&buffer, &left, '-'); 2899 if (err) 2900 break; 2901 err = proc_put_long(&buffer, &left, bit_b, false); 2902 if (err) 2903 break; 2904 } 2905 2906 first = 0; bit_b++; 2907 } 2908 if (!err) 2909 err = proc_put_char(&buffer, &left, '\n'); 2910 } 2911 2912 if (!err) { 2913 if (write) { 2914 if (*ppos) 2915 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2916 else 2917 memcpy(bitmap, tmp_bitmap, 2918 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2919 } 2920 kfree(tmp_bitmap); 2921 *lenp -= left; 2922 *ppos += *lenp; 2923 return 0; 2924 } else { 2925 kfree(tmp_bitmap); 2926 return err; 2927 } 2928 } 2929 2930 #else /* CONFIG_PROC_SYSCTL */ 2931 2932 int proc_dostring(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(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_minmax(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_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_dointvec_userhz_jiffies(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_dointvec_ms_jiffies(struct ctl_table *table, int write, 2963 void __user *buffer, size_t *lenp, loff_t *ppos) 2964 { 2965 return -ENOSYS; 2966 } 2967 2968 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2969 void __user *buffer, size_t *lenp, loff_t *ppos) 2970 { 2971 return -ENOSYS; 2972 } 2973 2974 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2975 void __user *buffer, 2976 size_t *lenp, loff_t *ppos) 2977 { 2978 return -ENOSYS; 2979 } 2980 2981 2982 #endif /* CONFIG_PROC_SYSCTL */ 2983 2984 /* 2985 * No sense putting this after each symbol definition, twice, 2986 * exception granted :-) 2987 */ 2988 EXPORT_SYMBOL(proc_dointvec); 2989 EXPORT_SYMBOL(proc_dointvec_jiffies); 2990 EXPORT_SYMBOL(proc_dointvec_minmax); 2991 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2992 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2993 EXPORT_SYMBOL(proc_dostring); 2994 EXPORT_SYMBOL(proc_doulongvec_minmax); 2995 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2996 EXPORT_SYMBOL(register_sysctl_table); 2997 EXPORT_SYMBOL(register_sysctl_paths); 2998 EXPORT_SYMBOL(unregister_sysctl_table); 2999