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_CFS_BANDWIDTH 383 { 384 .procname = "sched_cfs_bandwidth_slice_us", 385 .data = &sysctl_sched_cfs_bandwidth_slice, 386 .maxlen = sizeof(unsigned int), 387 .mode = 0644, 388 .proc_handler = proc_dointvec_minmax, 389 .extra1 = &one, 390 }, 391 #endif 392 #ifdef CONFIG_PROVE_LOCKING 393 { 394 .procname = "prove_locking", 395 .data = &prove_locking, 396 .maxlen = sizeof(int), 397 .mode = 0644, 398 .proc_handler = proc_dointvec, 399 }, 400 #endif 401 #ifdef CONFIG_LOCK_STAT 402 { 403 .procname = "lock_stat", 404 .data = &lock_stat, 405 .maxlen = sizeof(int), 406 .mode = 0644, 407 .proc_handler = proc_dointvec, 408 }, 409 #endif 410 { 411 .procname = "panic", 412 .data = &panic_timeout, 413 .maxlen = sizeof(int), 414 .mode = 0644, 415 .proc_handler = proc_dointvec, 416 }, 417 { 418 .procname = "core_uses_pid", 419 .data = &core_uses_pid, 420 .maxlen = sizeof(int), 421 .mode = 0644, 422 .proc_handler = proc_dointvec, 423 }, 424 { 425 .procname = "core_pattern", 426 .data = core_pattern, 427 .maxlen = CORENAME_MAX_SIZE, 428 .mode = 0644, 429 .proc_handler = proc_dostring, 430 }, 431 { 432 .procname = "core_pipe_limit", 433 .data = &core_pipe_limit, 434 .maxlen = sizeof(unsigned int), 435 .mode = 0644, 436 .proc_handler = proc_dointvec, 437 }, 438 #ifdef CONFIG_PROC_SYSCTL 439 { 440 .procname = "tainted", 441 .maxlen = sizeof(long), 442 .mode = 0644, 443 .proc_handler = proc_taint, 444 }, 445 #endif 446 #ifdef CONFIG_LATENCYTOP 447 { 448 .procname = "latencytop", 449 .data = &latencytop_enabled, 450 .maxlen = sizeof(int), 451 .mode = 0644, 452 .proc_handler = proc_dointvec, 453 }, 454 #endif 455 #ifdef CONFIG_BLK_DEV_INITRD 456 { 457 .procname = "real-root-dev", 458 .data = &real_root_dev, 459 .maxlen = sizeof(int), 460 .mode = 0644, 461 .proc_handler = proc_dointvec, 462 }, 463 #endif 464 { 465 .procname = "print-fatal-signals", 466 .data = &print_fatal_signals, 467 .maxlen = sizeof(int), 468 .mode = 0644, 469 .proc_handler = proc_dointvec, 470 }, 471 #ifdef CONFIG_SPARC 472 { 473 .procname = "reboot-cmd", 474 .data = reboot_command, 475 .maxlen = 256, 476 .mode = 0644, 477 .proc_handler = proc_dostring, 478 }, 479 { 480 .procname = "stop-a", 481 .data = &stop_a_enabled, 482 .maxlen = sizeof (int), 483 .mode = 0644, 484 .proc_handler = proc_dointvec, 485 }, 486 { 487 .procname = "scons-poweroff", 488 .data = &scons_pwroff, 489 .maxlen = sizeof (int), 490 .mode = 0644, 491 .proc_handler = proc_dointvec, 492 }, 493 #endif 494 #ifdef CONFIG_SPARC64 495 { 496 .procname = "tsb-ratio", 497 .data = &sysctl_tsb_ratio, 498 .maxlen = sizeof (int), 499 .mode = 0644, 500 .proc_handler = proc_dointvec, 501 }, 502 #endif 503 #ifdef __hppa__ 504 { 505 .procname = "soft-power", 506 .data = &pwrsw_enabled, 507 .maxlen = sizeof (int), 508 .mode = 0644, 509 .proc_handler = proc_dointvec, 510 }, 511 { 512 .procname = "unaligned-trap", 513 .data = &unaligned_enabled, 514 .maxlen = sizeof (int), 515 .mode = 0644, 516 .proc_handler = proc_dointvec, 517 }, 518 #endif 519 { 520 .procname = "ctrl-alt-del", 521 .data = &C_A_D, 522 .maxlen = sizeof(int), 523 .mode = 0644, 524 .proc_handler = proc_dointvec, 525 }, 526 #ifdef CONFIG_FUNCTION_TRACER 527 { 528 .procname = "ftrace_enabled", 529 .data = &ftrace_enabled, 530 .maxlen = sizeof(int), 531 .mode = 0644, 532 .proc_handler = ftrace_enable_sysctl, 533 }, 534 #endif 535 #ifdef CONFIG_STACK_TRACER 536 { 537 .procname = "stack_tracer_enabled", 538 .data = &stack_tracer_enabled, 539 .maxlen = sizeof(int), 540 .mode = 0644, 541 .proc_handler = stack_trace_sysctl, 542 }, 543 #endif 544 #ifdef CONFIG_TRACING 545 { 546 .procname = "ftrace_dump_on_oops", 547 .data = &ftrace_dump_on_oops, 548 .maxlen = sizeof(int), 549 .mode = 0644, 550 .proc_handler = proc_dointvec, 551 }, 552 #endif 553 #ifdef CONFIG_MODULES 554 { 555 .procname = "modprobe", 556 .data = &modprobe_path, 557 .maxlen = KMOD_PATH_LEN, 558 .mode = 0644, 559 .proc_handler = proc_dostring, 560 }, 561 { 562 .procname = "modules_disabled", 563 .data = &modules_disabled, 564 .maxlen = sizeof(int), 565 .mode = 0644, 566 /* only handle a transition from default "0" to "1" */ 567 .proc_handler = proc_dointvec_minmax, 568 .extra1 = &one, 569 .extra2 = &one, 570 }, 571 #endif 572 #ifdef CONFIG_HOTPLUG 573 { 574 .procname = "hotplug", 575 .data = &uevent_helper, 576 .maxlen = UEVENT_HELPER_PATH_LEN, 577 .mode = 0644, 578 .proc_handler = proc_dostring, 579 }, 580 #endif 581 #ifdef CONFIG_CHR_DEV_SG 582 { 583 .procname = "sg-big-buff", 584 .data = &sg_big_buff, 585 .maxlen = sizeof (int), 586 .mode = 0444, 587 .proc_handler = proc_dointvec, 588 }, 589 #endif 590 #ifdef CONFIG_BSD_PROCESS_ACCT 591 { 592 .procname = "acct", 593 .data = &acct_parm, 594 .maxlen = 3*sizeof(int), 595 .mode = 0644, 596 .proc_handler = proc_dointvec, 597 }, 598 #endif 599 #ifdef CONFIG_MAGIC_SYSRQ 600 { 601 .procname = "sysrq", 602 .data = &__sysrq_enabled, 603 .maxlen = sizeof (int), 604 .mode = 0644, 605 .proc_handler = sysrq_sysctl_handler, 606 }, 607 #endif 608 #ifdef CONFIG_PROC_SYSCTL 609 { 610 .procname = "cad_pid", 611 .data = NULL, 612 .maxlen = sizeof (int), 613 .mode = 0600, 614 .proc_handler = proc_do_cad_pid, 615 }, 616 #endif 617 { 618 .procname = "threads-max", 619 .data = &max_threads, 620 .maxlen = sizeof(int), 621 .mode = 0644, 622 .proc_handler = proc_dointvec, 623 }, 624 { 625 .procname = "random", 626 .mode = 0555, 627 .child = random_table, 628 }, 629 { 630 .procname = "usermodehelper", 631 .mode = 0555, 632 .child = usermodehelper_table, 633 }, 634 { 635 .procname = "overflowuid", 636 .data = &overflowuid, 637 .maxlen = sizeof(int), 638 .mode = 0644, 639 .proc_handler = proc_dointvec_minmax, 640 .extra1 = &minolduid, 641 .extra2 = &maxolduid, 642 }, 643 { 644 .procname = "overflowgid", 645 .data = &overflowgid, 646 .maxlen = sizeof(int), 647 .mode = 0644, 648 .proc_handler = proc_dointvec_minmax, 649 .extra1 = &minolduid, 650 .extra2 = &maxolduid, 651 }, 652 #ifdef CONFIG_S390 653 #ifdef CONFIG_MATHEMU 654 { 655 .procname = "ieee_emulation_warnings", 656 .data = &sysctl_ieee_emulation_warnings, 657 .maxlen = sizeof(int), 658 .mode = 0644, 659 .proc_handler = proc_dointvec, 660 }, 661 #endif 662 { 663 .procname = "userprocess_debug", 664 .data = &show_unhandled_signals, 665 .maxlen = sizeof(int), 666 .mode = 0644, 667 .proc_handler = proc_dointvec, 668 }, 669 #endif 670 { 671 .procname = "pid_max", 672 .data = &pid_max, 673 .maxlen = sizeof (int), 674 .mode = 0644, 675 .proc_handler = proc_dointvec_minmax, 676 .extra1 = &pid_max_min, 677 .extra2 = &pid_max_max, 678 }, 679 { 680 .procname = "panic_on_oops", 681 .data = &panic_on_oops, 682 .maxlen = sizeof(int), 683 .mode = 0644, 684 .proc_handler = proc_dointvec, 685 }, 686 #if defined CONFIG_PRINTK 687 { 688 .procname = "printk", 689 .data = &console_loglevel, 690 .maxlen = 4*sizeof(int), 691 .mode = 0644, 692 .proc_handler = proc_dointvec, 693 }, 694 { 695 .procname = "printk_ratelimit", 696 .data = &printk_ratelimit_state.interval, 697 .maxlen = sizeof(int), 698 .mode = 0644, 699 .proc_handler = proc_dointvec_jiffies, 700 }, 701 { 702 .procname = "printk_ratelimit_burst", 703 .data = &printk_ratelimit_state.burst, 704 .maxlen = sizeof(int), 705 .mode = 0644, 706 .proc_handler = proc_dointvec, 707 }, 708 { 709 .procname = "printk_delay", 710 .data = &printk_delay_msec, 711 .maxlen = sizeof(int), 712 .mode = 0644, 713 .proc_handler = proc_dointvec_minmax, 714 .extra1 = &zero, 715 .extra2 = &ten_thousand, 716 }, 717 { 718 .procname = "dmesg_restrict", 719 .data = &dmesg_restrict, 720 .maxlen = sizeof(int), 721 .mode = 0644, 722 .proc_handler = proc_dointvec_minmax, 723 .extra1 = &zero, 724 .extra2 = &one, 725 }, 726 { 727 .procname = "kptr_restrict", 728 .data = &kptr_restrict, 729 .maxlen = sizeof(int), 730 .mode = 0644, 731 .proc_handler = proc_dmesg_restrict, 732 .extra1 = &zero, 733 .extra2 = &two, 734 }, 735 #endif 736 { 737 .procname = "ngroups_max", 738 .data = &ngroups_max, 739 .maxlen = sizeof (int), 740 .mode = 0444, 741 .proc_handler = proc_dointvec, 742 }, 743 #if defined(CONFIG_LOCKUP_DETECTOR) 744 { 745 .procname = "watchdog", 746 .data = &watchdog_enabled, 747 .maxlen = sizeof (int), 748 .mode = 0644, 749 .proc_handler = proc_dowatchdog, 750 .extra1 = &zero, 751 .extra2 = &one, 752 }, 753 { 754 .procname = "watchdog_thresh", 755 .data = &watchdog_thresh, 756 .maxlen = sizeof(int), 757 .mode = 0644, 758 .proc_handler = proc_dowatchdog, 759 .extra1 = &neg_one, 760 .extra2 = &sixty, 761 }, 762 { 763 .procname = "softlockup_panic", 764 .data = &softlockup_panic, 765 .maxlen = sizeof(int), 766 .mode = 0644, 767 .proc_handler = proc_dointvec_minmax, 768 .extra1 = &zero, 769 .extra2 = &one, 770 }, 771 { 772 .procname = "nmi_watchdog", 773 .data = &watchdog_enabled, 774 .maxlen = sizeof (int), 775 .mode = 0644, 776 .proc_handler = proc_dowatchdog, 777 .extra1 = &zero, 778 .extra2 = &one, 779 }, 780 #endif 781 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 782 { 783 .procname = "unknown_nmi_panic", 784 .data = &unknown_nmi_panic, 785 .maxlen = sizeof (int), 786 .mode = 0644, 787 .proc_handler = proc_dointvec, 788 }, 789 #endif 790 #if defined(CONFIG_X86) 791 { 792 .procname = "panic_on_unrecovered_nmi", 793 .data = &panic_on_unrecovered_nmi, 794 .maxlen = sizeof(int), 795 .mode = 0644, 796 .proc_handler = proc_dointvec, 797 }, 798 { 799 .procname = "panic_on_io_nmi", 800 .data = &panic_on_io_nmi, 801 .maxlen = sizeof(int), 802 .mode = 0644, 803 .proc_handler = proc_dointvec, 804 }, 805 { 806 .procname = "bootloader_type", 807 .data = &bootloader_type, 808 .maxlen = sizeof (int), 809 .mode = 0444, 810 .proc_handler = proc_dointvec, 811 }, 812 { 813 .procname = "bootloader_version", 814 .data = &bootloader_version, 815 .maxlen = sizeof (int), 816 .mode = 0444, 817 .proc_handler = proc_dointvec, 818 }, 819 { 820 .procname = "kstack_depth_to_print", 821 .data = &kstack_depth_to_print, 822 .maxlen = sizeof(int), 823 .mode = 0644, 824 .proc_handler = proc_dointvec, 825 }, 826 { 827 .procname = "io_delay_type", 828 .data = &io_delay_type, 829 .maxlen = sizeof(int), 830 .mode = 0644, 831 .proc_handler = proc_dointvec, 832 }, 833 #endif 834 #if defined(CONFIG_MMU) 835 { 836 .procname = "randomize_va_space", 837 .data = &randomize_va_space, 838 .maxlen = sizeof(int), 839 .mode = 0644, 840 .proc_handler = proc_dointvec, 841 }, 842 #endif 843 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 844 { 845 .procname = "spin_retry", 846 .data = &spin_retry, 847 .maxlen = sizeof (int), 848 .mode = 0644, 849 .proc_handler = proc_dointvec, 850 }, 851 #endif 852 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 853 { 854 .procname = "acpi_video_flags", 855 .data = &acpi_realmode_flags, 856 .maxlen = sizeof (unsigned long), 857 .mode = 0644, 858 .proc_handler = proc_doulongvec_minmax, 859 }, 860 #endif 861 #ifdef CONFIG_IA64 862 { 863 .procname = "ignore-unaligned-usertrap", 864 .data = &no_unaligned_warning, 865 .maxlen = sizeof (int), 866 .mode = 0644, 867 .proc_handler = proc_dointvec, 868 }, 869 { 870 .procname = "unaligned-dump-stack", 871 .data = &unaligned_dump_stack, 872 .maxlen = sizeof (int), 873 .mode = 0644, 874 .proc_handler = proc_dointvec, 875 }, 876 #endif 877 #ifdef CONFIG_DETECT_HUNG_TASK 878 { 879 .procname = "hung_task_panic", 880 .data = &sysctl_hung_task_panic, 881 .maxlen = sizeof(int), 882 .mode = 0644, 883 .proc_handler = proc_dointvec_minmax, 884 .extra1 = &zero, 885 .extra2 = &one, 886 }, 887 { 888 .procname = "hung_task_check_count", 889 .data = &sysctl_hung_task_check_count, 890 .maxlen = sizeof(unsigned long), 891 .mode = 0644, 892 .proc_handler = proc_doulongvec_minmax, 893 }, 894 { 895 .procname = "hung_task_timeout_secs", 896 .data = &sysctl_hung_task_timeout_secs, 897 .maxlen = sizeof(unsigned long), 898 .mode = 0644, 899 .proc_handler = proc_dohung_task_timeout_secs, 900 }, 901 { 902 .procname = "hung_task_warnings", 903 .data = &sysctl_hung_task_warnings, 904 .maxlen = sizeof(unsigned long), 905 .mode = 0644, 906 .proc_handler = proc_doulongvec_minmax, 907 }, 908 #endif 909 #ifdef CONFIG_COMPAT 910 { 911 .procname = "compat-log", 912 .data = &compat_log, 913 .maxlen = sizeof (int), 914 .mode = 0644, 915 .proc_handler = proc_dointvec, 916 }, 917 #endif 918 #ifdef CONFIG_RT_MUTEXES 919 { 920 .procname = "max_lock_depth", 921 .data = &max_lock_depth, 922 .maxlen = sizeof(int), 923 .mode = 0644, 924 .proc_handler = proc_dointvec, 925 }, 926 #endif 927 { 928 .procname = "poweroff_cmd", 929 .data = &poweroff_cmd, 930 .maxlen = POWEROFF_CMD_PATH_LEN, 931 .mode = 0644, 932 .proc_handler = proc_dostring, 933 }, 934 #ifdef CONFIG_KEYS 935 { 936 .procname = "keys", 937 .mode = 0555, 938 .child = key_sysctls, 939 }, 940 #endif 941 #ifdef CONFIG_RCU_TORTURE_TEST 942 { 943 .procname = "rcutorture_runnable", 944 .data = &rcutorture_runnable, 945 .maxlen = sizeof(int), 946 .mode = 0644, 947 .proc_handler = proc_dointvec, 948 }, 949 #endif 950 #ifdef CONFIG_PERF_EVENTS 951 /* 952 * User-space scripts rely on the existence of this file 953 * as a feature check for perf_events being enabled. 954 * 955 * So it's an ABI, do not remove! 956 */ 957 { 958 .procname = "perf_event_paranoid", 959 .data = &sysctl_perf_event_paranoid, 960 .maxlen = sizeof(sysctl_perf_event_paranoid), 961 .mode = 0644, 962 .proc_handler = proc_dointvec, 963 }, 964 { 965 .procname = "perf_event_mlock_kb", 966 .data = &sysctl_perf_event_mlock, 967 .maxlen = sizeof(sysctl_perf_event_mlock), 968 .mode = 0644, 969 .proc_handler = proc_dointvec, 970 }, 971 { 972 .procname = "perf_event_max_sample_rate", 973 .data = &sysctl_perf_event_sample_rate, 974 .maxlen = sizeof(sysctl_perf_event_sample_rate), 975 .mode = 0644, 976 .proc_handler = perf_proc_update_handler, 977 }, 978 #endif 979 #ifdef CONFIG_KMEMCHECK 980 { 981 .procname = "kmemcheck", 982 .data = &kmemcheck_enabled, 983 .maxlen = sizeof(int), 984 .mode = 0644, 985 .proc_handler = proc_dointvec, 986 }, 987 #endif 988 #ifdef CONFIG_BLOCK 989 { 990 .procname = "blk_iopoll", 991 .data = &blk_iopoll_enabled, 992 .maxlen = sizeof(int), 993 .mode = 0644, 994 .proc_handler = proc_dointvec, 995 }, 996 #endif 997 { } 998 }; 999 1000 static struct ctl_table vm_table[] = { 1001 { 1002 .procname = "overcommit_memory", 1003 .data = &sysctl_overcommit_memory, 1004 .maxlen = sizeof(sysctl_overcommit_memory), 1005 .mode = 0644, 1006 .proc_handler = proc_dointvec_minmax, 1007 .extra1 = &zero, 1008 .extra2 = &two, 1009 }, 1010 { 1011 .procname = "panic_on_oom", 1012 .data = &sysctl_panic_on_oom, 1013 .maxlen = sizeof(sysctl_panic_on_oom), 1014 .mode = 0644, 1015 .proc_handler = proc_dointvec_minmax, 1016 .extra1 = &zero, 1017 .extra2 = &two, 1018 }, 1019 { 1020 .procname = "oom_kill_allocating_task", 1021 .data = &sysctl_oom_kill_allocating_task, 1022 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1023 .mode = 0644, 1024 .proc_handler = proc_dointvec, 1025 }, 1026 { 1027 .procname = "oom_dump_tasks", 1028 .data = &sysctl_oom_dump_tasks, 1029 .maxlen = sizeof(sysctl_oom_dump_tasks), 1030 .mode = 0644, 1031 .proc_handler = proc_dointvec, 1032 }, 1033 { 1034 .procname = "overcommit_ratio", 1035 .data = &sysctl_overcommit_ratio, 1036 .maxlen = sizeof(sysctl_overcommit_ratio), 1037 .mode = 0644, 1038 .proc_handler = proc_dointvec, 1039 }, 1040 { 1041 .procname = "page-cluster", 1042 .data = &page_cluster, 1043 .maxlen = sizeof(int), 1044 .mode = 0644, 1045 .proc_handler = proc_dointvec_minmax, 1046 .extra1 = &zero, 1047 }, 1048 { 1049 .procname = "dirty_background_ratio", 1050 .data = &dirty_background_ratio, 1051 .maxlen = sizeof(dirty_background_ratio), 1052 .mode = 0644, 1053 .proc_handler = dirty_background_ratio_handler, 1054 .extra1 = &zero, 1055 .extra2 = &one_hundred, 1056 }, 1057 { 1058 .procname = "dirty_background_bytes", 1059 .data = &dirty_background_bytes, 1060 .maxlen = sizeof(dirty_background_bytes), 1061 .mode = 0644, 1062 .proc_handler = dirty_background_bytes_handler, 1063 .extra1 = &one_ul, 1064 }, 1065 { 1066 .procname = "dirty_ratio", 1067 .data = &vm_dirty_ratio, 1068 .maxlen = sizeof(vm_dirty_ratio), 1069 .mode = 0644, 1070 .proc_handler = dirty_ratio_handler, 1071 .extra1 = &zero, 1072 .extra2 = &one_hundred, 1073 }, 1074 { 1075 .procname = "dirty_bytes", 1076 .data = &vm_dirty_bytes, 1077 .maxlen = sizeof(vm_dirty_bytes), 1078 .mode = 0644, 1079 .proc_handler = dirty_bytes_handler, 1080 .extra1 = &dirty_bytes_min, 1081 }, 1082 { 1083 .procname = "dirty_writeback_centisecs", 1084 .data = &dirty_writeback_interval, 1085 .maxlen = sizeof(dirty_writeback_interval), 1086 .mode = 0644, 1087 .proc_handler = dirty_writeback_centisecs_handler, 1088 }, 1089 { 1090 .procname = "dirty_expire_centisecs", 1091 .data = &dirty_expire_interval, 1092 .maxlen = sizeof(dirty_expire_interval), 1093 .mode = 0644, 1094 .proc_handler = proc_dointvec_minmax, 1095 .extra1 = &zero, 1096 }, 1097 { 1098 .procname = "nr_pdflush_threads", 1099 .data = &nr_pdflush_threads, 1100 .maxlen = sizeof nr_pdflush_threads, 1101 .mode = 0444 /* read-only*/, 1102 .proc_handler = proc_dointvec, 1103 }, 1104 { 1105 .procname = "swappiness", 1106 .data = &vm_swappiness, 1107 .maxlen = sizeof(vm_swappiness), 1108 .mode = 0644, 1109 .proc_handler = proc_dointvec_minmax, 1110 .extra1 = &zero, 1111 .extra2 = &one_hundred, 1112 }, 1113 #ifdef CONFIG_HUGETLB_PAGE 1114 { 1115 .procname = "nr_hugepages", 1116 .data = NULL, 1117 .maxlen = sizeof(unsigned long), 1118 .mode = 0644, 1119 .proc_handler = hugetlb_sysctl_handler, 1120 .extra1 = (void *)&hugetlb_zero, 1121 .extra2 = (void *)&hugetlb_infinity, 1122 }, 1123 #ifdef CONFIG_NUMA 1124 { 1125 .procname = "nr_hugepages_mempolicy", 1126 .data = NULL, 1127 .maxlen = sizeof(unsigned long), 1128 .mode = 0644, 1129 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1130 .extra1 = (void *)&hugetlb_zero, 1131 .extra2 = (void *)&hugetlb_infinity, 1132 }, 1133 #endif 1134 { 1135 .procname = "hugetlb_shm_group", 1136 .data = &sysctl_hugetlb_shm_group, 1137 .maxlen = sizeof(gid_t), 1138 .mode = 0644, 1139 .proc_handler = proc_dointvec, 1140 }, 1141 { 1142 .procname = "hugepages_treat_as_movable", 1143 .data = &hugepages_treat_as_movable, 1144 .maxlen = sizeof(int), 1145 .mode = 0644, 1146 .proc_handler = hugetlb_treat_movable_handler, 1147 }, 1148 { 1149 .procname = "nr_overcommit_hugepages", 1150 .data = NULL, 1151 .maxlen = sizeof(unsigned long), 1152 .mode = 0644, 1153 .proc_handler = hugetlb_overcommit_handler, 1154 .extra1 = (void *)&hugetlb_zero, 1155 .extra2 = (void *)&hugetlb_infinity, 1156 }, 1157 #endif 1158 { 1159 .procname = "lowmem_reserve_ratio", 1160 .data = &sysctl_lowmem_reserve_ratio, 1161 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1162 .mode = 0644, 1163 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1164 }, 1165 { 1166 .procname = "drop_caches", 1167 .data = &sysctl_drop_caches, 1168 .maxlen = sizeof(int), 1169 .mode = 0644, 1170 .proc_handler = drop_caches_sysctl_handler, 1171 .extra1 = &one, 1172 .extra2 = &three, 1173 }, 1174 #ifdef CONFIG_COMPACTION 1175 { 1176 .procname = "compact_memory", 1177 .data = &sysctl_compact_memory, 1178 .maxlen = sizeof(int), 1179 .mode = 0200, 1180 .proc_handler = sysctl_compaction_handler, 1181 }, 1182 { 1183 .procname = "extfrag_threshold", 1184 .data = &sysctl_extfrag_threshold, 1185 .maxlen = sizeof(int), 1186 .mode = 0644, 1187 .proc_handler = sysctl_extfrag_handler, 1188 .extra1 = &min_extfrag_threshold, 1189 .extra2 = &max_extfrag_threshold, 1190 }, 1191 1192 #endif /* CONFIG_COMPACTION */ 1193 { 1194 .procname = "min_free_kbytes", 1195 .data = &min_free_kbytes, 1196 .maxlen = sizeof(min_free_kbytes), 1197 .mode = 0644, 1198 .proc_handler = min_free_kbytes_sysctl_handler, 1199 .extra1 = &zero, 1200 }, 1201 { 1202 .procname = "percpu_pagelist_fraction", 1203 .data = &percpu_pagelist_fraction, 1204 .maxlen = sizeof(percpu_pagelist_fraction), 1205 .mode = 0644, 1206 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1207 .extra1 = &min_percpu_pagelist_fract, 1208 }, 1209 #ifdef CONFIG_MMU 1210 { 1211 .procname = "max_map_count", 1212 .data = &sysctl_max_map_count, 1213 .maxlen = sizeof(sysctl_max_map_count), 1214 .mode = 0644, 1215 .proc_handler = proc_dointvec_minmax, 1216 .extra1 = &zero, 1217 }, 1218 #else 1219 { 1220 .procname = "nr_trim_pages", 1221 .data = &sysctl_nr_trim_pages, 1222 .maxlen = sizeof(sysctl_nr_trim_pages), 1223 .mode = 0644, 1224 .proc_handler = proc_dointvec_minmax, 1225 .extra1 = &zero, 1226 }, 1227 #endif 1228 { 1229 .procname = "laptop_mode", 1230 .data = &laptop_mode, 1231 .maxlen = sizeof(laptop_mode), 1232 .mode = 0644, 1233 .proc_handler = proc_dointvec_jiffies, 1234 }, 1235 { 1236 .procname = "block_dump", 1237 .data = &block_dump, 1238 .maxlen = sizeof(block_dump), 1239 .mode = 0644, 1240 .proc_handler = proc_dointvec, 1241 .extra1 = &zero, 1242 }, 1243 { 1244 .procname = "vfs_cache_pressure", 1245 .data = &sysctl_vfs_cache_pressure, 1246 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1247 .mode = 0644, 1248 .proc_handler = proc_dointvec, 1249 .extra1 = &zero, 1250 }, 1251 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1252 { 1253 .procname = "legacy_va_layout", 1254 .data = &sysctl_legacy_va_layout, 1255 .maxlen = sizeof(sysctl_legacy_va_layout), 1256 .mode = 0644, 1257 .proc_handler = proc_dointvec, 1258 .extra1 = &zero, 1259 }, 1260 #endif 1261 #ifdef CONFIG_NUMA 1262 { 1263 .procname = "zone_reclaim_mode", 1264 .data = &zone_reclaim_mode, 1265 .maxlen = sizeof(zone_reclaim_mode), 1266 .mode = 0644, 1267 .proc_handler = proc_dointvec, 1268 .extra1 = &zero, 1269 }, 1270 { 1271 .procname = "min_unmapped_ratio", 1272 .data = &sysctl_min_unmapped_ratio, 1273 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1274 .mode = 0644, 1275 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1276 .extra1 = &zero, 1277 .extra2 = &one_hundred, 1278 }, 1279 { 1280 .procname = "min_slab_ratio", 1281 .data = &sysctl_min_slab_ratio, 1282 .maxlen = sizeof(sysctl_min_slab_ratio), 1283 .mode = 0644, 1284 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1285 .extra1 = &zero, 1286 .extra2 = &one_hundred, 1287 }, 1288 #endif 1289 #ifdef CONFIG_SMP 1290 { 1291 .procname = "stat_interval", 1292 .data = &sysctl_stat_interval, 1293 .maxlen = sizeof(sysctl_stat_interval), 1294 .mode = 0644, 1295 .proc_handler = proc_dointvec_jiffies, 1296 }, 1297 #endif 1298 #ifdef CONFIG_MMU 1299 { 1300 .procname = "mmap_min_addr", 1301 .data = &dac_mmap_min_addr, 1302 .maxlen = sizeof(unsigned long), 1303 .mode = 0644, 1304 .proc_handler = mmap_min_addr_handler, 1305 }, 1306 #endif 1307 #ifdef CONFIG_NUMA 1308 { 1309 .procname = "numa_zonelist_order", 1310 .data = &numa_zonelist_order, 1311 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1312 .mode = 0644, 1313 .proc_handler = numa_zonelist_order_handler, 1314 }, 1315 #endif 1316 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1317 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1318 { 1319 .procname = "vdso_enabled", 1320 .data = &vdso_enabled, 1321 .maxlen = sizeof(vdso_enabled), 1322 .mode = 0644, 1323 .proc_handler = proc_dointvec, 1324 .extra1 = &zero, 1325 }, 1326 #endif 1327 #ifdef CONFIG_HIGHMEM 1328 { 1329 .procname = "highmem_is_dirtyable", 1330 .data = &vm_highmem_is_dirtyable, 1331 .maxlen = sizeof(vm_highmem_is_dirtyable), 1332 .mode = 0644, 1333 .proc_handler = proc_dointvec_minmax, 1334 .extra1 = &zero, 1335 .extra2 = &one, 1336 }, 1337 #endif 1338 { 1339 .procname = "scan_unevictable_pages", 1340 .data = &scan_unevictable_pages, 1341 .maxlen = sizeof(scan_unevictable_pages), 1342 .mode = 0644, 1343 .proc_handler = scan_unevictable_handler, 1344 }, 1345 #ifdef CONFIG_MEMORY_FAILURE 1346 { 1347 .procname = "memory_failure_early_kill", 1348 .data = &sysctl_memory_failure_early_kill, 1349 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1350 .mode = 0644, 1351 .proc_handler = proc_dointvec_minmax, 1352 .extra1 = &zero, 1353 .extra2 = &one, 1354 }, 1355 { 1356 .procname = "memory_failure_recovery", 1357 .data = &sysctl_memory_failure_recovery, 1358 .maxlen = sizeof(sysctl_memory_failure_recovery), 1359 .mode = 0644, 1360 .proc_handler = proc_dointvec_minmax, 1361 .extra1 = &zero, 1362 .extra2 = &one, 1363 }, 1364 #endif 1365 { } 1366 }; 1367 1368 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1369 static struct ctl_table binfmt_misc_table[] = { 1370 { } 1371 }; 1372 #endif 1373 1374 static struct ctl_table fs_table[] = { 1375 { 1376 .procname = "inode-nr", 1377 .data = &inodes_stat, 1378 .maxlen = 2*sizeof(int), 1379 .mode = 0444, 1380 .proc_handler = proc_nr_inodes, 1381 }, 1382 { 1383 .procname = "inode-state", 1384 .data = &inodes_stat, 1385 .maxlen = 7*sizeof(int), 1386 .mode = 0444, 1387 .proc_handler = proc_nr_inodes, 1388 }, 1389 { 1390 .procname = "file-nr", 1391 .data = &files_stat, 1392 .maxlen = sizeof(files_stat), 1393 .mode = 0444, 1394 .proc_handler = proc_nr_files, 1395 }, 1396 { 1397 .procname = "file-max", 1398 .data = &files_stat.max_files, 1399 .maxlen = sizeof(files_stat.max_files), 1400 .mode = 0644, 1401 .proc_handler = proc_doulongvec_minmax, 1402 }, 1403 { 1404 .procname = "nr_open", 1405 .data = &sysctl_nr_open, 1406 .maxlen = sizeof(int), 1407 .mode = 0644, 1408 .proc_handler = proc_dointvec_minmax, 1409 .extra1 = &sysctl_nr_open_min, 1410 .extra2 = &sysctl_nr_open_max, 1411 }, 1412 { 1413 .procname = "dentry-state", 1414 .data = &dentry_stat, 1415 .maxlen = 6*sizeof(int), 1416 .mode = 0444, 1417 .proc_handler = proc_nr_dentry, 1418 }, 1419 { 1420 .procname = "overflowuid", 1421 .data = &fs_overflowuid, 1422 .maxlen = sizeof(int), 1423 .mode = 0644, 1424 .proc_handler = proc_dointvec_minmax, 1425 .extra1 = &minolduid, 1426 .extra2 = &maxolduid, 1427 }, 1428 { 1429 .procname = "overflowgid", 1430 .data = &fs_overflowgid, 1431 .maxlen = sizeof(int), 1432 .mode = 0644, 1433 .proc_handler = proc_dointvec_minmax, 1434 .extra1 = &minolduid, 1435 .extra2 = &maxolduid, 1436 }, 1437 #ifdef CONFIG_FILE_LOCKING 1438 { 1439 .procname = "leases-enable", 1440 .data = &leases_enable, 1441 .maxlen = sizeof(int), 1442 .mode = 0644, 1443 .proc_handler = proc_dointvec, 1444 }, 1445 #endif 1446 #ifdef CONFIG_DNOTIFY 1447 { 1448 .procname = "dir-notify-enable", 1449 .data = &dir_notify_enable, 1450 .maxlen = sizeof(int), 1451 .mode = 0644, 1452 .proc_handler = proc_dointvec, 1453 }, 1454 #endif 1455 #ifdef CONFIG_MMU 1456 #ifdef CONFIG_FILE_LOCKING 1457 { 1458 .procname = "lease-break-time", 1459 .data = &lease_break_time, 1460 .maxlen = sizeof(int), 1461 .mode = 0644, 1462 .proc_handler = proc_dointvec, 1463 }, 1464 #endif 1465 #ifdef CONFIG_AIO 1466 { 1467 .procname = "aio-nr", 1468 .data = &aio_nr, 1469 .maxlen = sizeof(aio_nr), 1470 .mode = 0444, 1471 .proc_handler = proc_doulongvec_minmax, 1472 }, 1473 { 1474 .procname = "aio-max-nr", 1475 .data = &aio_max_nr, 1476 .maxlen = sizeof(aio_max_nr), 1477 .mode = 0644, 1478 .proc_handler = proc_doulongvec_minmax, 1479 }, 1480 #endif /* CONFIG_AIO */ 1481 #ifdef CONFIG_INOTIFY_USER 1482 { 1483 .procname = "inotify", 1484 .mode = 0555, 1485 .child = inotify_table, 1486 }, 1487 #endif 1488 #ifdef CONFIG_EPOLL 1489 { 1490 .procname = "epoll", 1491 .mode = 0555, 1492 .child = epoll_table, 1493 }, 1494 #endif 1495 #endif 1496 { 1497 .procname = "suid_dumpable", 1498 .data = &suid_dumpable, 1499 .maxlen = sizeof(int), 1500 .mode = 0644, 1501 .proc_handler = proc_dointvec_minmax, 1502 .extra1 = &zero, 1503 .extra2 = &two, 1504 }, 1505 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1506 { 1507 .procname = "binfmt_misc", 1508 .mode = 0555, 1509 .child = binfmt_misc_table, 1510 }, 1511 #endif 1512 { 1513 .procname = "pipe-max-size", 1514 .data = &pipe_max_size, 1515 .maxlen = sizeof(int), 1516 .mode = 0644, 1517 .proc_handler = &pipe_proc_fn, 1518 .extra1 = &pipe_min_size, 1519 }, 1520 { } 1521 }; 1522 1523 static struct ctl_table debug_table[] = { 1524 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1525 defined(CONFIG_S390) || defined(CONFIG_TILE) 1526 { 1527 .procname = "exception-trace", 1528 .data = &show_unhandled_signals, 1529 .maxlen = sizeof(int), 1530 .mode = 0644, 1531 .proc_handler = proc_dointvec 1532 }, 1533 #endif 1534 #if defined(CONFIG_OPTPROBES) 1535 { 1536 .procname = "kprobes-optimization", 1537 .data = &sysctl_kprobes_optimization, 1538 .maxlen = sizeof(int), 1539 .mode = 0644, 1540 .proc_handler = proc_kprobes_optimization_handler, 1541 .extra1 = &zero, 1542 .extra2 = &one, 1543 }, 1544 #endif 1545 { } 1546 }; 1547 1548 static struct ctl_table dev_table[] = { 1549 { } 1550 }; 1551 1552 static DEFINE_SPINLOCK(sysctl_lock); 1553 1554 /* called under sysctl_lock */ 1555 static int use_table(struct ctl_table_header *p) 1556 { 1557 if (unlikely(p->unregistering)) 1558 return 0; 1559 p->used++; 1560 return 1; 1561 } 1562 1563 /* called under sysctl_lock */ 1564 static void unuse_table(struct ctl_table_header *p) 1565 { 1566 if (!--p->used) 1567 if (unlikely(p->unregistering)) 1568 complete(p->unregistering); 1569 } 1570 1571 /* called under sysctl_lock, will reacquire if has to wait */ 1572 static void start_unregistering(struct ctl_table_header *p) 1573 { 1574 /* 1575 * if p->used is 0, nobody will ever touch that entry again; 1576 * we'll eliminate all paths to it before dropping sysctl_lock 1577 */ 1578 if (unlikely(p->used)) { 1579 struct completion wait; 1580 init_completion(&wait); 1581 p->unregistering = &wait; 1582 spin_unlock(&sysctl_lock); 1583 wait_for_completion(&wait); 1584 spin_lock(&sysctl_lock); 1585 } else { 1586 /* anything non-NULL; we'll never dereference it */ 1587 p->unregistering = ERR_PTR(-EINVAL); 1588 } 1589 /* 1590 * do not remove from the list until nobody holds it; walking the 1591 * list in do_sysctl() relies on that. 1592 */ 1593 list_del_init(&p->ctl_entry); 1594 } 1595 1596 void sysctl_head_get(struct ctl_table_header *head) 1597 { 1598 spin_lock(&sysctl_lock); 1599 head->count++; 1600 spin_unlock(&sysctl_lock); 1601 } 1602 1603 void sysctl_head_put(struct ctl_table_header *head) 1604 { 1605 spin_lock(&sysctl_lock); 1606 if (!--head->count) 1607 kfree_rcu(head, rcu); 1608 spin_unlock(&sysctl_lock); 1609 } 1610 1611 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1612 { 1613 if (!head) 1614 BUG(); 1615 spin_lock(&sysctl_lock); 1616 if (!use_table(head)) 1617 head = ERR_PTR(-ENOENT); 1618 spin_unlock(&sysctl_lock); 1619 return head; 1620 } 1621 1622 void sysctl_head_finish(struct ctl_table_header *head) 1623 { 1624 if (!head) 1625 return; 1626 spin_lock(&sysctl_lock); 1627 unuse_table(head); 1628 spin_unlock(&sysctl_lock); 1629 } 1630 1631 static struct ctl_table_set * 1632 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1633 { 1634 struct ctl_table_set *set = &root->default_set; 1635 if (root->lookup) 1636 set = root->lookup(root, namespaces); 1637 return set; 1638 } 1639 1640 static struct list_head * 1641 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1642 { 1643 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1644 return &set->list; 1645 } 1646 1647 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1648 struct ctl_table_header *prev) 1649 { 1650 struct ctl_table_root *root; 1651 struct list_head *header_list; 1652 struct ctl_table_header *head; 1653 struct list_head *tmp; 1654 1655 spin_lock(&sysctl_lock); 1656 if (prev) { 1657 head = prev; 1658 tmp = &prev->ctl_entry; 1659 unuse_table(prev); 1660 goto next; 1661 } 1662 tmp = &root_table_header.ctl_entry; 1663 for (;;) { 1664 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1665 1666 if (!use_table(head)) 1667 goto next; 1668 spin_unlock(&sysctl_lock); 1669 return head; 1670 next: 1671 root = head->root; 1672 tmp = tmp->next; 1673 header_list = lookup_header_list(root, namespaces); 1674 if (tmp != header_list) 1675 continue; 1676 1677 do { 1678 root = list_entry(root->root_list.next, 1679 struct ctl_table_root, root_list); 1680 if (root == &sysctl_table_root) 1681 goto out; 1682 header_list = lookup_header_list(root, namespaces); 1683 } while (list_empty(header_list)); 1684 tmp = header_list->next; 1685 } 1686 out: 1687 spin_unlock(&sysctl_lock); 1688 return NULL; 1689 } 1690 1691 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1692 { 1693 return __sysctl_head_next(current->nsproxy, prev); 1694 } 1695 1696 void register_sysctl_root(struct ctl_table_root *root) 1697 { 1698 spin_lock(&sysctl_lock); 1699 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1700 spin_unlock(&sysctl_lock); 1701 } 1702 1703 /* 1704 * sysctl_perm does NOT grant the superuser all rights automatically, because 1705 * some sysctl variables are readonly even to root. 1706 */ 1707 1708 static int test_perm(int mode, int op) 1709 { 1710 if (!current_euid()) 1711 mode >>= 6; 1712 else if (in_egroup_p(0)) 1713 mode >>= 3; 1714 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1715 return 0; 1716 return -EACCES; 1717 } 1718 1719 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1720 { 1721 int mode; 1722 1723 if (root->permissions) 1724 mode = root->permissions(root, current->nsproxy, table); 1725 else 1726 mode = table->mode; 1727 1728 return test_perm(mode, op); 1729 } 1730 1731 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1732 { 1733 for (; table->procname; table++) { 1734 table->parent = parent; 1735 if (table->child) 1736 sysctl_set_parent(table, table->child); 1737 } 1738 } 1739 1740 static __init int sysctl_init(void) 1741 { 1742 sysctl_set_parent(NULL, root_table); 1743 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1744 sysctl_check_table(current->nsproxy, root_table); 1745 #endif 1746 return 0; 1747 } 1748 1749 core_initcall(sysctl_init); 1750 1751 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1752 struct ctl_table *table) 1753 { 1754 struct ctl_table *p; 1755 const char *s = branch->procname; 1756 1757 /* branch should have named subdirectory as its first element */ 1758 if (!s || !branch->child) 1759 return NULL; 1760 1761 /* ... and nothing else */ 1762 if (branch[1].procname) 1763 return NULL; 1764 1765 /* table should contain subdirectory with the same name */ 1766 for (p = table; p->procname; p++) { 1767 if (!p->child) 1768 continue; 1769 if (p->procname && strcmp(p->procname, s) == 0) 1770 return p; 1771 } 1772 return NULL; 1773 } 1774 1775 /* see if attaching q to p would be an improvement */ 1776 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1777 { 1778 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1779 struct ctl_table *next; 1780 int is_better = 0; 1781 int not_in_parent = !p->attached_by; 1782 1783 while ((next = is_branch_in(by, to)) != NULL) { 1784 if (by == q->attached_by) 1785 is_better = 1; 1786 if (to == p->attached_by) 1787 not_in_parent = 1; 1788 by = by->child; 1789 to = next->child; 1790 } 1791 1792 if (is_better && not_in_parent) { 1793 q->attached_by = by; 1794 q->attached_to = to; 1795 q->parent = p; 1796 } 1797 } 1798 1799 /** 1800 * __register_sysctl_paths - register a sysctl hierarchy 1801 * @root: List of sysctl headers to register on 1802 * @namespaces: Data to compute which lists of sysctl entries are visible 1803 * @path: The path to the directory the sysctl table is in. 1804 * @table: the top-level table structure 1805 * 1806 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1807 * array. A completely 0 filled entry terminates the table. 1808 * 1809 * The members of the &struct ctl_table structure are used as follows: 1810 * 1811 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1812 * enter a sysctl file 1813 * 1814 * data - a pointer to data for use by proc_handler 1815 * 1816 * maxlen - the maximum size in bytes of the data 1817 * 1818 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1819 * 1820 * child - a pointer to the child sysctl table if this entry is a directory, or 1821 * %NULL. 1822 * 1823 * proc_handler - the text handler routine (described below) 1824 * 1825 * de - for internal use by the sysctl routines 1826 * 1827 * extra1, extra2 - extra pointers usable by the proc handler routines 1828 * 1829 * Leaf nodes in the sysctl tree will be represented by a single file 1830 * under /proc; non-leaf nodes will be represented by directories. 1831 * 1832 * sysctl(2) can automatically manage read and write requests through 1833 * the sysctl table. The data and maxlen fields of the ctl_table 1834 * struct enable minimal validation of the values being written to be 1835 * performed, and the mode field allows minimal authentication. 1836 * 1837 * There must be a proc_handler routine for any terminal nodes 1838 * mirrored under /proc/sys (non-terminals are handled by a built-in 1839 * directory handler). Several default handlers are available to 1840 * cover common cases - 1841 * 1842 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1843 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1844 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1845 * 1846 * It is the handler's job to read the input buffer from user memory 1847 * and process it. The handler should return 0 on success. 1848 * 1849 * This routine returns %NULL on a failure to register, and a pointer 1850 * to the table header on success. 1851 */ 1852 struct ctl_table_header *__register_sysctl_paths( 1853 struct ctl_table_root *root, 1854 struct nsproxy *namespaces, 1855 const struct ctl_path *path, struct ctl_table *table) 1856 { 1857 struct ctl_table_header *header; 1858 struct ctl_table *new, **prevp; 1859 unsigned int n, npath; 1860 struct ctl_table_set *set; 1861 1862 /* Count the path components */ 1863 for (npath = 0; path[npath].procname; ++npath) 1864 ; 1865 1866 /* 1867 * For each path component, allocate a 2-element ctl_table array. 1868 * The first array element will be filled with the sysctl entry 1869 * for this, the second will be the sentinel (procname == 0). 1870 * 1871 * We allocate everything in one go so that we don't have to 1872 * worry about freeing additional memory in unregister_sysctl_table. 1873 */ 1874 header = kzalloc(sizeof(struct ctl_table_header) + 1875 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1876 if (!header) 1877 return NULL; 1878 1879 new = (struct ctl_table *) (header + 1); 1880 1881 /* Now connect the dots */ 1882 prevp = &header->ctl_table; 1883 for (n = 0; n < npath; ++n, ++path) { 1884 /* Copy the procname */ 1885 new->procname = path->procname; 1886 new->mode = 0555; 1887 1888 *prevp = new; 1889 prevp = &new->child; 1890 1891 new += 2; 1892 } 1893 *prevp = table; 1894 header->ctl_table_arg = table; 1895 1896 INIT_LIST_HEAD(&header->ctl_entry); 1897 header->used = 0; 1898 header->unregistering = NULL; 1899 header->root = root; 1900 sysctl_set_parent(NULL, header->ctl_table); 1901 header->count = 1; 1902 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1903 if (sysctl_check_table(namespaces, header->ctl_table)) { 1904 kfree(header); 1905 return NULL; 1906 } 1907 #endif 1908 spin_lock(&sysctl_lock); 1909 header->set = lookup_header_set(root, namespaces); 1910 header->attached_by = header->ctl_table; 1911 header->attached_to = root_table; 1912 header->parent = &root_table_header; 1913 for (set = header->set; set; set = set->parent) { 1914 struct ctl_table_header *p; 1915 list_for_each_entry(p, &set->list, ctl_entry) { 1916 if (p->unregistering) 1917 continue; 1918 try_attach(p, header); 1919 } 1920 } 1921 header->parent->count++; 1922 list_add_tail(&header->ctl_entry, &header->set->list); 1923 spin_unlock(&sysctl_lock); 1924 1925 return header; 1926 } 1927 1928 /** 1929 * register_sysctl_table_path - register a sysctl table hierarchy 1930 * @path: The path to the directory the sysctl table is in. 1931 * @table: the top-level table structure 1932 * 1933 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1934 * array. A completely 0 filled entry terminates the table. 1935 * 1936 * See __register_sysctl_paths for more details. 1937 */ 1938 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1939 struct ctl_table *table) 1940 { 1941 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1942 path, table); 1943 } 1944 1945 /** 1946 * register_sysctl_table - register a sysctl table hierarchy 1947 * @table: the top-level table structure 1948 * 1949 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1950 * array. A completely 0 filled entry terminates the table. 1951 * 1952 * See register_sysctl_paths for more details. 1953 */ 1954 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1955 { 1956 static const struct ctl_path null_path[] = { {} }; 1957 1958 return register_sysctl_paths(null_path, table); 1959 } 1960 1961 /** 1962 * unregister_sysctl_table - unregister a sysctl table hierarchy 1963 * @header: the header returned from register_sysctl_table 1964 * 1965 * Unregisters the sysctl table and all children. proc entries may not 1966 * actually be removed until they are no longer used by anyone. 1967 */ 1968 void unregister_sysctl_table(struct ctl_table_header * header) 1969 { 1970 might_sleep(); 1971 1972 if (header == NULL) 1973 return; 1974 1975 spin_lock(&sysctl_lock); 1976 start_unregistering(header); 1977 if (!--header->parent->count) { 1978 WARN_ON(1); 1979 kfree_rcu(header->parent, rcu); 1980 } 1981 if (!--header->count) 1982 kfree_rcu(header, rcu); 1983 spin_unlock(&sysctl_lock); 1984 } 1985 1986 int sysctl_is_seen(struct ctl_table_header *p) 1987 { 1988 struct ctl_table_set *set = p->set; 1989 int res; 1990 spin_lock(&sysctl_lock); 1991 if (p->unregistering) 1992 res = 0; 1993 else if (!set->is_seen) 1994 res = 1; 1995 else 1996 res = set->is_seen(set); 1997 spin_unlock(&sysctl_lock); 1998 return res; 1999 } 2000 2001 void setup_sysctl_set(struct ctl_table_set *p, 2002 struct ctl_table_set *parent, 2003 int (*is_seen)(struct ctl_table_set *)) 2004 { 2005 INIT_LIST_HEAD(&p->list); 2006 p->parent = parent ? parent : &sysctl_table_root.default_set; 2007 p->is_seen = is_seen; 2008 } 2009 2010 #else /* !CONFIG_SYSCTL */ 2011 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2012 { 2013 return NULL; 2014 } 2015 2016 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2017 struct ctl_table *table) 2018 { 2019 return NULL; 2020 } 2021 2022 void unregister_sysctl_table(struct ctl_table_header * table) 2023 { 2024 } 2025 2026 void setup_sysctl_set(struct ctl_table_set *p, 2027 struct ctl_table_set *parent, 2028 int (*is_seen)(struct ctl_table_set *)) 2029 { 2030 } 2031 2032 void sysctl_head_put(struct ctl_table_header *head) 2033 { 2034 } 2035 2036 #endif /* CONFIG_SYSCTL */ 2037 2038 /* 2039 * /proc/sys support 2040 */ 2041 2042 #ifdef CONFIG_PROC_SYSCTL 2043 2044 static int _proc_do_string(void* data, int maxlen, int write, 2045 void __user *buffer, 2046 size_t *lenp, loff_t *ppos) 2047 { 2048 size_t len; 2049 char __user *p; 2050 char c; 2051 2052 if (!data || !maxlen || !*lenp) { 2053 *lenp = 0; 2054 return 0; 2055 } 2056 2057 if (write) { 2058 len = 0; 2059 p = buffer; 2060 while (len < *lenp) { 2061 if (get_user(c, p++)) 2062 return -EFAULT; 2063 if (c == 0 || c == '\n') 2064 break; 2065 len++; 2066 } 2067 if (len >= maxlen) 2068 len = maxlen-1; 2069 if(copy_from_user(data, buffer, len)) 2070 return -EFAULT; 2071 ((char *) data)[len] = 0; 2072 *ppos += *lenp; 2073 } else { 2074 len = strlen(data); 2075 if (len > maxlen) 2076 len = maxlen; 2077 2078 if (*ppos > len) { 2079 *lenp = 0; 2080 return 0; 2081 } 2082 2083 data += *ppos; 2084 len -= *ppos; 2085 2086 if (len > *lenp) 2087 len = *lenp; 2088 if (len) 2089 if(copy_to_user(buffer, data, len)) 2090 return -EFAULT; 2091 if (len < *lenp) { 2092 if(put_user('\n', ((char __user *) buffer) + len)) 2093 return -EFAULT; 2094 len++; 2095 } 2096 *lenp = len; 2097 *ppos += len; 2098 } 2099 return 0; 2100 } 2101 2102 /** 2103 * proc_dostring - read a string sysctl 2104 * @table: the sysctl table 2105 * @write: %TRUE if this is a write to the sysctl file 2106 * @buffer: the user buffer 2107 * @lenp: the size of the user buffer 2108 * @ppos: file position 2109 * 2110 * Reads/writes a string from/to the user buffer. If the kernel 2111 * buffer provided is not large enough to hold the string, the 2112 * string is truncated. The copied string is %NULL-terminated. 2113 * If the string is being read by the user process, it is copied 2114 * and a newline '\n' is added. It is truncated if the buffer is 2115 * not large enough. 2116 * 2117 * Returns 0 on success. 2118 */ 2119 int proc_dostring(struct ctl_table *table, int write, 2120 void __user *buffer, size_t *lenp, loff_t *ppos) 2121 { 2122 return _proc_do_string(table->data, table->maxlen, write, 2123 buffer, lenp, ppos); 2124 } 2125 2126 static size_t proc_skip_spaces(char **buf) 2127 { 2128 size_t ret; 2129 char *tmp = skip_spaces(*buf); 2130 ret = tmp - *buf; 2131 *buf = tmp; 2132 return ret; 2133 } 2134 2135 static void proc_skip_char(char **buf, size_t *size, const char v) 2136 { 2137 while (*size) { 2138 if (**buf != v) 2139 break; 2140 (*size)--; 2141 (*buf)++; 2142 } 2143 } 2144 2145 #define TMPBUFLEN 22 2146 /** 2147 * proc_get_long - reads an ASCII formatted integer from a user buffer 2148 * 2149 * @buf: a kernel buffer 2150 * @size: size of the kernel buffer 2151 * @val: this is where the number will be stored 2152 * @neg: set to %TRUE if number is negative 2153 * @perm_tr: a vector which contains the allowed trailers 2154 * @perm_tr_len: size of the perm_tr vector 2155 * @tr: pointer to store the trailer character 2156 * 2157 * In case of success %0 is returned and @buf and @size are updated with 2158 * the amount of bytes read. If @tr is non-NULL and a trailing 2159 * character exists (size is non-zero after returning from this 2160 * function), @tr is updated with the trailing character. 2161 */ 2162 static int proc_get_long(char **buf, size_t *size, 2163 unsigned long *val, bool *neg, 2164 const char *perm_tr, unsigned perm_tr_len, char *tr) 2165 { 2166 int len; 2167 char *p, tmp[TMPBUFLEN]; 2168 2169 if (!*size) 2170 return -EINVAL; 2171 2172 len = *size; 2173 if (len > TMPBUFLEN - 1) 2174 len = TMPBUFLEN - 1; 2175 2176 memcpy(tmp, *buf, len); 2177 2178 tmp[len] = 0; 2179 p = tmp; 2180 if (*p == '-' && *size > 1) { 2181 *neg = true; 2182 p++; 2183 } else 2184 *neg = false; 2185 if (!isdigit(*p)) 2186 return -EINVAL; 2187 2188 *val = simple_strtoul(p, &p, 0); 2189 2190 len = p - tmp; 2191 2192 /* We don't know if the next char is whitespace thus we may accept 2193 * invalid integers (e.g. 1234...a) or two integers instead of one 2194 * (e.g. 123...1). So lets not allow such large numbers. */ 2195 if (len == TMPBUFLEN - 1) 2196 return -EINVAL; 2197 2198 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2199 return -EINVAL; 2200 2201 if (tr && (len < *size)) 2202 *tr = *p; 2203 2204 *buf += len; 2205 *size -= len; 2206 2207 return 0; 2208 } 2209 2210 /** 2211 * proc_put_long - converts an integer to a decimal ASCII formatted string 2212 * 2213 * @buf: the user buffer 2214 * @size: the size of the user buffer 2215 * @val: the integer to be converted 2216 * @neg: sign of the number, %TRUE for negative 2217 * 2218 * In case of success %0 is returned and @buf and @size are updated with 2219 * the amount of bytes written. 2220 */ 2221 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2222 bool neg) 2223 { 2224 int len; 2225 char tmp[TMPBUFLEN], *p = tmp; 2226 2227 sprintf(p, "%s%lu", neg ? "-" : "", val); 2228 len = strlen(tmp); 2229 if (len > *size) 2230 len = *size; 2231 if (copy_to_user(*buf, tmp, len)) 2232 return -EFAULT; 2233 *size -= len; 2234 *buf += len; 2235 return 0; 2236 } 2237 #undef TMPBUFLEN 2238 2239 static int proc_put_char(void __user **buf, size_t *size, char c) 2240 { 2241 if (*size) { 2242 char __user **buffer = (char __user **)buf; 2243 if (put_user(c, *buffer)) 2244 return -EFAULT; 2245 (*size)--, (*buffer)++; 2246 *buf = *buffer; 2247 } 2248 return 0; 2249 } 2250 2251 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2252 int *valp, 2253 int write, void *data) 2254 { 2255 if (write) { 2256 *valp = *negp ? -*lvalp : *lvalp; 2257 } else { 2258 int val = *valp; 2259 if (val < 0) { 2260 *negp = true; 2261 *lvalp = (unsigned long)-val; 2262 } else { 2263 *negp = false; 2264 *lvalp = (unsigned long)val; 2265 } 2266 } 2267 return 0; 2268 } 2269 2270 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2271 2272 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2273 int write, void __user *buffer, 2274 size_t *lenp, loff_t *ppos, 2275 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2276 int write, void *data), 2277 void *data) 2278 { 2279 int *i, vleft, first = 1, err = 0; 2280 unsigned long page = 0; 2281 size_t left; 2282 char *kbuf; 2283 2284 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2285 *lenp = 0; 2286 return 0; 2287 } 2288 2289 i = (int *) tbl_data; 2290 vleft = table->maxlen / sizeof(*i); 2291 left = *lenp; 2292 2293 if (!conv) 2294 conv = do_proc_dointvec_conv; 2295 2296 if (write) { 2297 if (left > PAGE_SIZE - 1) 2298 left = PAGE_SIZE - 1; 2299 page = __get_free_page(GFP_TEMPORARY); 2300 kbuf = (char *) page; 2301 if (!kbuf) 2302 return -ENOMEM; 2303 if (copy_from_user(kbuf, buffer, left)) { 2304 err = -EFAULT; 2305 goto free; 2306 } 2307 kbuf[left] = 0; 2308 } 2309 2310 for (; left && vleft--; i++, first=0) { 2311 unsigned long lval; 2312 bool neg; 2313 2314 if (write) { 2315 left -= proc_skip_spaces(&kbuf); 2316 2317 if (!left) 2318 break; 2319 err = proc_get_long(&kbuf, &left, &lval, &neg, 2320 proc_wspace_sep, 2321 sizeof(proc_wspace_sep), NULL); 2322 if (err) 2323 break; 2324 if (conv(&neg, &lval, i, 1, data)) { 2325 err = -EINVAL; 2326 break; 2327 } 2328 } else { 2329 if (conv(&neg, &lval, i, 0, data)) { 2330 err = -EINVAL; 2331 break; 2332 } 2333 if (!first) 2334 err = proc_put_char(&buffer, &left, '\t'); 2335 if (err) 2336 break; 2337 err = proc_put_long(&buffer, &left, lval, neg); 2338 if (err) 2339 break; 2340 } 2341 } 2342 2343 if (!write && !first && left && !err) 2344 err = proc_put_char(&buffer, &left, '\n'); 2345 if (write && !err && left) 2346 left -= proc_skip_spaces(&kbuf); 2347 free: 2348 if (write) { 2349 free_page(page); 2350 if (first) 2351 return err ? : -EINVAL; 2352 } 2353 *lenp -= left; 2354 *ppos += *lenp; 2355 return err; 2356 } 2357 2358 static int do_proc_dointvec(struct ctl_table *table, int write, 2359 void __user *buffer, size_t *lenp, loff_t *ppos, 2360 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2361 int write, void *data), 2362 void *data) 2363 { 2364 return __do_proc_dointvec(table->data, table, write, 2365 buffer, lenp, ppos, conv, data); 2366 } 2367 2368 /** 2369 * proc_dointvec - read a vector of integers 2370 * @table: the sysctl table 2371 * @write: %TRUE if this is a write to the sysctl file 2372 * @buffer: the user buffer 2373 * @lenp: the size of the user buffer 2374 * @ppos: file position 2375 * 2376 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2377 * values from/to the user buffer, treated as an ASCII string. 2378 * 2379 * Returns 0 on success. 2380 */ 2381 int proc_dointvec(struct ctl_table *table, int write, 2382 void __user *buffer, size_t *lenp, loff_t *ppos) 2383 { 2384 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2385 NULL,NULL); 2386 } 2387 2388 /* 2389 * Taint values can only be increased 2390 * This means we can safely use a temporary. 2391 */ 2392 static int proc_taint(struct ctl_table *table, int write, 2393 void __user *buffer, size_t *lenp, loff_t *ppos) 2394 { 2395 struct ctl_table t; 2396 unsigned long tmptaint = get_taint(); 2397 int err; 2398 2399 if (write && !capable(CAP_SYS_ADMIN)) 2400 return -EPERM; 2401 2402 t = *table; 2403 t.data = &tmptaint; 2404 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2405 if (err < 0) 2406 return err; 2407 2408 if (write) { 2409 /* 2410 * Poor man's atomic or. Not worth adding a primitive 2411 * to everyone's atomic.h for this 2412 */ 2413 int i; 2414 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2415 if ((tmptaint >> i) & 1) 2416 add_taint(i); 2417 } 2418 } 2419 2420 return err; 2421 } 2422 2423 #ifdef CONFIG_PRINTK 2424 static int proc_dmesg_restrict(struct ctl_table *table, int write, 2425 void __user *buffer, size_t *lenp, loff_t *ppos) 2426 { 2427 if (write && !capable(CAP_SYS_ADMIN)) 2428 return -EPERM; 2429 2430 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2431 } 2432 #endif 2433 2434 struct do_proc_dointvec_minmax_conv_param { 2435 int *min; 2436 int *max; 2437 }; 2438 2439 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2440 int *valp, 2441 int write, void *data) 2442 { 2443 struct do_proc_dointvec_minmax_conv_param *param = data; 2444 if (write) { 2445 int val = *negp ? -*lvalp : *lvalp; 2446 if ((param->min && *param->min > val) || 2447 (param->max && *param->max < val)) 2448 return -EINVAL; 2449 *valp = val; 2450 } else { 2451 int val = *valp; 2452 if (val < 0) { 2453 *negp = true; 2454 *lvalp = (unsigned long)-val; 2455 } else { 2456 *negp = false; 2457 *lvalp = (unsigned long)val; 2458 } 2459 } 2460 return 0; 2461 } 2462 2463 /** 2464 * proc_dointvec_minmax - read a vector of integers with min/max values 2465 * @table: the sysctl table 2466 * @write: %TRUE if this is a write to the sysctl file 2467 * @buffer: the user buffer 2468 * @lenp: the size of the user buffer 2469 * @ppos: file position 2470 * 2471 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2472 * values from/to the user buffer, treated as an ASCII string. 2473 * 2474 * This routine will ensure the values are within the range specified by 2475 * table->extra1 (min) and table->extra2 (max). 2476 * 2477 * Returns 0 on success. 2478 */ 2479 int proc_dointvec_minmax(struct ctl_table *table, int write, 2480 void __user *buffer, size_t *lenp, loff_t *ppos) 2481 { 2482 struct do_proc_dointvec_minmax_conv_param param = { 2483 .min = (int *) table->extra1, 2484 .max = (int *) table->extra2, 2485 }; 2486 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2487 do_proc_dointvec_minmax_conv, ¶m); 2488 } 2489 2490 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2491 void __user *buffer, 2492 size_t *lenp, loff_t *ppos, 2493 unsigned long convmul, 2494 unsigned long convdiv) 2495 { 2496 unsigned long *i, *min, *max; 2497 int vleft, first = 1, err = 0; 2498 unsigned long page = 0; 2499 size_t left; 2500 char *kbuf; 2501 2502 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2503 *lenp = 0; 2504 return 0; 2505 } 2506 2507 i = (unsigned long *) data; 2508 min = (unsigned long *) table->extra1; 2509 max = (unsigned long *) table->extra2; 2510 vleft = table->maxlen / sizeof(unsigned long); 2511 left = *lenp; 2512 2513 if (write) { 2514 if (left > PAGE_SIZE - 1) 2515 left = PAGE_SIZE - 1; 2516 page = __get_free_page(GFP_TEMPORARY); 2517 kbuf = (char *) page; 2518 if (!kbuf) 2519 return -ENOMEM; 2520 if (copy_from_user(kbuf, buffer, left)) { 2521 err = -EFAULT; 2522 goto free; 2523 } 2524 kbuf[left] = 0; 2525 } 2526 2527 for (; left && vleft--; i++, first = 0) { 2528 unsigned long val; 2529 2530 if (write) { 2531 bool neg; 2532 2533 left -= proc_skip_spaces(&kbuf); 2534 2535 err = proc_get_long(&kbuf, &left, &val, &neg, 2536 proc_wspace_sep, 2537 sizeof(proc_wspace_sep), NULL); 2538 if (err) 2539 break; 2540 if (neg) 2541 continue; 2542 if ((min && val < *min) || (max && val > *max)) 2543 continue; 2544 *i = val; 2545 } else { 2546 val = convdiv * (*i) / convmul; 2547 if (!first) 2548 err = proc_put_char(&buffer, &left, '\t'); 2549 err = proc_put_long(&buffer, &left, val, false); 2550 if (err) 2551 break; 2552 } 2553 } 2554 2555 if (!write && !first && left && !err) 2556 err = proc_put_char(&buffer, &left, '\n'); 2557 if (write && !err) 2558 left -= proc_skip_spaces(&kbuf); 2559 free: 2560 if (write) { 2561 free_page(page); 2562 if (first) 2563 return err ? : -EINVAL; 2564 } 2565 *lenp -= left; 2566 *ppos += *lenp; 2567 return err; 2568 } 2569 2570 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2571 void __user *buffer, 2572 size_t *lenp, loff_t *ppos, 2573 unsigned long convmul, 2574 unsigned long convdiv) 2575 { 2576 return __do_proc_doulongvec_minmax(table->data, table, write, 2577 buffer, lenp, ppos, convmul, convdiv); 2578 } 2579 2580 /** 2581 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2582 * @table: the sysctl table 2583 * @write: %TRUE if this is a write to the sysctl file 2584 * @buffer: the user buffer 2585 * @lenp: the size of the user buffer 2586 * @ppos: file position 2587 * 2588 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2589 * values from/to the user buffer, treated as an ASCII string. 2590 * 2591 * This routine will ensure the values are within the range specified by 2592 * table->extra1 (min) and table->extra2 (max). 2593 * 2594 * Returns 0 on success. 2595 */ 2596 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2597 void __user *buffer, size_t *lenp, loff_t *ppos) 2598 { 2599 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2600 } 2601 2602 /** 2603 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2604 * @table: the sysctl table 2605 * @write: %TRUE if this is a write to the sysctl file 2606 * @buffer: the user buffer 2607 * @lenp: the size of the user buffer 2608 * @ppos: file position 2609 * 2610 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2611 * values from/to the user buffer, treated as an ASCII string. The values 2612 * are treated as milliseconds, and converted to jiffies when they are stored. 2613 * 2614 * This routine will ensure the values are within the range specified by 2615 * table->extra1 (min) and table->extra2 (max). 2616 * 2617 * Returns 0 on success. 2618 */ 2619 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2620 void __user *buffer, 2621 size_t *lenp, loff_t *ppos) 2622 { 2623 return do_proc_doulongvec_minmax(table, write, buffer, 2624 lenp, ppos, HZ, 1000l); 2625 } 2626 2627 2628 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2629 int *valp, 2630 int write, void *data) 2631 { 2632 if (write) { 2633 if (*lvalp > LONG_MAX / HZ) 2634 return 1; 2635 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2636 } else { 2637 int val = *valp; 2638 unsigned long lval; 2639 if (val < 0) { 2640 *negp = true; 2641 lval = (unsigned long)-val; 2642 } else { 2643 *negp = false; 2644 lval = (unsigned long)val; 2645 } 2646 *lvalp = lval / HZ; 2647 } 2648 return 0; 2649 } 2650 2651 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2652 int *valp, 2653 int write, void *data) 2654 { 2655 if (write) { 2656 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2657 return 1; 2658 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2659 } else { 2660 int val = *valp; 2661 unsigned long lval; 2662 if (val < 0) { 2663 *negp = true; 2664 lval = (unsigned long)-val; 2665 } else { 2666 *negp = false; 2667 lval = (unsigned long)val; 2668 } 2669 *lvalp = jiffies_to_clock_t(lval); 2670 } 2671 return 0; 2672 } 2673 2674 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2675 int *valp, 2676 int write, void *data) 2677 { 2678 if (write) { 2679 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2680 } else { 2681 int val = *valp; 2682 unsigned long lval; 2683 if (val < 0) { 2684 *negp = true; 2685 lval = (unsigned long)-val; 2686 } else { 2687 *negp = false; 2688 lval = (unsigned long)val; 2689 } 2690 *lvalp = jiffies_to_msecs(lval); 2691 } 2692 return 0; 2693 } 2694 2695 /** 2696 * proc_dointvec_jiffies - read a vector of integers as seconds 2697 * @table: the sysctl table 2698 * @write: %TRUE if this is a write to the sysctl file 2699 * @buffer: the user buffer 2700 * @lenp: the size of the user buffer 2701 * @ppos: file position 2702 * 2703 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2704 * values from/to the user buffer, treated as an ASCII string. 2705 * The values read are assumed to be in seconds, and are converted into 2706 * jiffies. 2707 * 2708 * Returns 0 on success. 2709 */ 2710 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2711 void __user *buffer, size_t *lenp, loff_t *ppos) 2712 { 2713 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2714 do_proc_dointvec_jiffies_conv,NULL); 2715 } 2716 2717 /** 2718 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2719 * @table: the sysctl table 2720 * @write: %TRUE if this is a write to the sysctl file 2721 * @buffer: the user buffer 2722 * @lenp: the size of the user buffer 2723 * @ppos: pointer to the file position 2724 * 2725 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2726 * values from/to the user buffer, treated as an ASCII string. 2727 * The values read are assumed to be in 1/USER_HZ seconds, and 2728 * are converted into jiffies. 2729 * 2730 * Returns 0 on success. 2731 */ 2732 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2733 void __user *buffer, size_t *lenp, loff_t *ppos) 2734 { 2735 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2736 do_proc_dointvec_userhz_jiffies_conv,NULL); 2737 } 2738 2739 /** 2740 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2741 * @table: the sysctl table 2742 * @write: %TRUE if this is a write to the sysctl file 2743 * @buffer: the user buffer 2744 * @lenp: the size of the user buffer 2745 * @ppos: file position 2746 * @ppos: the current position in the file 2747 * 2748 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2749 * values from/to the user buffer, treated as an ASCII string. 2750 * The values read are assumed to be in 1/1000 seconds, and 2751 * are converted into jiffies. 2752 * 2753 * Returns 0 on success. 2754 */ 2755 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2756 void __user *buffer, size_t *lenp, loff_t *ppos) 2757 { 2758 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2759 do_proc_dointvec_ms_jiffies_conv, NULL); 2760 } 2761 2762 static int proc_do_cad_pid(struct ctl_table *table, int write, 2763 void __user *buffer, size_t *lenp, loff_t *ppos) 2764 { 2765 struct pid *new_pid; 2766 pid_t tmp; 2767 int r; 2768 2769 tmp = pid_vnr(cad_pid); 2770 2771 r = __do_proc_dointvec(&tmp, table, write, buffer, 2772 lenp, ppos, NULL, NULL); 2773 if (r || !write) 2774 return r; 2775 2776 new_pid = find_get_pid(tmp); 2777 if (!new_pid) 2778 return -ESRCH; 2779 2780 put_pid(xchg(&cad_pid, new_pid)); 2781 return 0; 2782 } 2783 2784 /** 2785 * proc_do_large_bitmap - read/write from/to a large bitmap 2786 * @table: the sysctl table 2787 * @write: %TRUE if this is a write to the sysctl file 2788 * @buffer: the user buffer 2789 * @lenp: the size of the user buffer 2790 * @ppos: file position 2791 * 2792 * The bitmap is stored at table->data and the bitmap length (in bits) 2793 * in table->maxlen. 2794 * 2795 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2796 * large bitmaps may be represented in a compact manner. Writing into 2797 * the file will clear the bitmap then update it with the given input. 2798 * 2799 * Returns 0 on success. 2800 */ 2801 int proc_do_large_bitmap(struct ctl_table *table, int write, 2802 void __user *buffer, size_t *lenp, loff_t *ppos) 2803 { 2804 int err = 0; 2805 bool first = 1; 2806 size_t left = *lenp; 2807 unsigned long bitmap_len = table->maxlen; 2808 unsigned long *bitmap = (unsigned long *) table->data; 2809 unsigned long *tmp_bitmap = NULL; 2810 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2811 2812 if (!bitmap_len || !left || (*ppos && !write)) { 2813 *lenp = 0; 2814 return 0; 2815 } 2816 2817 if (write) { 2818 unsigned long page = 0; 2819 char *kbuf; 2820 2821 if (left > PAGE_SIZE - 1) 2822 left = PAGE_SIZE - 1; 2823 2824 page = __get_free_page(GFP_TEMPORARY); 2825 kbuf = (char *) page; 2826 if (!kbuf) 2827 return -ENOMEM; 2828 if (copy_from_user(kbuf, buffer, left)) { 2829 free_page(page); 2830 return -EFAULT; 2831 } 2832 kbuf[left] = 0; 2833 2834 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2835 GFP_KERNEL); 2836 if (!tmp_bitmap) { 2837 free_page(page); 2838 return -ENOMEM; 2839 } 2840 proc_skip_char(&kbuf, &left, '\n'); 2841 while (!err && left) { 2842 unsigned long val_a, val_b; 2843 bool neg; 2844 2845 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2846 sizeof(tr_a), &c); 2847 if (err) 2848 break; 2849 if (val_a >= bitmap_len || neg) { 2850 err = -EINVAL; 2851 break; 2852 } 2853 2854 val_b = val_a; 2855 if (left) { 2856 kbuf++; 2857 left--; 2858 } 2859 2860 if (c == '-') { 2861 err = proc_get_long(&kbuf, &left, &val_b, 2862 &neg, tr_b, sizeof(tr_b), 2863 &c); 2864 if (err) 2865 break; 2866 if (val_b >= bitmap_len || neg || 2867 val_a > val_b) { 2868 err = -EINVAL; 2869 break; 2870 } 2871 if (left) { 2872 kbuf++; 2873 left--; 2874 } 2875 } 2876 2877 while (val_a <= val_b) 2878 set_bit(val_a++, tmp_bitmap); 2879 2880 first = 0; 2881 proc_skip_char(&kbuf, &left, '\n'); 2882 } 2883 free_page(page); 2884 } else { 2885 unsigned long bit_a, bit_b = 0; 2886 2887 while (left) { 2888 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2889 if (bit_a >= bitmap_len) 2890 break; 2891 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2892 bit_a + 1) - 1; 2893 2894 if (!first) { 2895 err = proc_put_char(&buffer, &left, ','); 2896 if (err) 2897 break; 2898 } 2899 err = proc_put_long(&buffer, &left, bit_a, false); 2900 if (err) 2901 break; 2902 if (bit_a != bit_b) { 2903 err = proc_put_char(&buffer, &left, '-'); 2904 if (err) 2905 break; 2906 err = proc_put_long(&buffer, &left, bit_b, false); 2907 if (err) 2908 break; 2909 } 2910 2911 first = 0; bit_b++; 2912 } 2913 if (!err) 2914 err = proc_put_char(&buffer, &left, '\n'); 2915 } 2916 2917 if (!err) { 2918 if (write) { 2919 if (*ppos) 2920 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2921 else 2922 memcpy(bitmap, tmp_bitmap, 2923 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2924 } 2925 kfree(tmp_bitmap); 2926 *lenp -= left; 2927 *ppos += *lenp; 2928 return 0; 2929 } else { 2930 kfree(tmp_bitmap); 2931 return err; 2932 } 2933 } 2934 2935 #else /* CONFIG_PROC_SYSCTL */ 2936 2937 int proc_dostring(struct ctl_table *table, int write, 2938 void __user *buffer, size_t *lenp, loff_t *ppos) 2939 { 2940 return -ENOSYS; 2941 } 2942 2943 int proc_dointvec(struct ctl_table *table, int write, 2944 void __user *buffer, size_t *lenp, loff_t *ppos) 2945 { 2946 return -ENOSYS; 2947 } 2948 2949 int proc_dointvec_minmax(struct ctl_table *table, int write, 2950 void __user *buffer, size_t *lenp, loff_t *ppos) 2951 { 2952 return -ENOSYS; 2953 } 2954 2955 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2956 void __user *buffer, size_t *lenp, loff_t *ppos) 2957 { 2958 return -ENOSYS; 2959 } 2960 2961 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2962 void __user *buffer, size_t *lenp, loff_t *ppos) 2963 { 2964 return -ENOSYS; 2965 } 2966 2967 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2968 void __user *buffer, size_t *lenp, loff_t *ppos) 2969 { 2970 return -ENOSYS; 2971 } 2972 2973 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2974 void __user *buffer, size_t *lenp, loff_t *ppos) 2975 { 2976 return -ENOSYS; 2977 } 2978 2979 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2980 void __user *buffer, 2981 size_t *lenp, loff_t *ppos) 2982 { 2983 return -ENOSYS; 2984 } 2985 2986 2987 #endif /* CONFIG_PROC_SYSCTL */ 2988 2989 /* 2990 * No sense putting this after each symbol definition, twice, 2991 * exception granted :-) 2992 */ 2993 EXPORT_SYMBOL(proc_dointvec); 2994 EXPORT_SYMBOL(proc_dointvec_jiffies); 2995 EXPORT_SYMBOL(proc_dointvec_minmax); 2996 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2997 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2998 EXPORT_SYMBOL(proc_dostring); 2999 EXPORT_SYMBOL(proc_doulongvec_minmax); 3000 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3001 EXPORT_SYMBOL(register_sysctl_table); 3002 EXPORT_SYMBOL(register_sysctl_paths); 3003 EXPORT_SYMBOL(unregister_sysctl_table); 3004