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 #include <linux/capability.h> 61 62 #include <asm/uaccess.h> 63 #include <asm/processor.h> 64 65 #ifdef CONFIG_X86 66 #include <asm/nmi.h> 67 #include <asm/stacktrace.h> 68 #include <asm/io.h> 69 #endif 70 #ifdef CONFIG_BSD_PROCESS_ACCT 71 #include <linux/acct.h> 72 #endif 73 #ifdef CONFIG_RT_MUTEXES 74 #include <linux/rtmutex.h> 75 #endif 76 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 77 #include <linux/lockdep.h> 78 #endif 79 #ifdef CONFIG_CHR_DEV_SG 80 #include <scsi/sg.h> 81 #endif 82 83 #ifdef CONFIG_LOCKUP_DETECTOR 84 #include <linux/nmi.h> 85 #endif 86 87 88 #if defined(CONFIG_SYSCTL) 89 90 /* External variables not in a header file. */ 91 extern int sysctl_overcommit_memory; 92 extern int sysctl_overcommit_ratio; 93 extern int max_threads; 94 extern int core_uses_pid; 95 extern int suid_dumpable; 96 extern char core_pattern[]; 97 extern unsigned int core_pipe_limit; 98 extern int pid_max; 99 extern int min_free_kbytes; 100 extern int pid_max_min, pid_max_max; 101 extern int sysctl_drop_caches; 102 extern int percpu_pagelist_fraction; 103 extern int compat_log; 104 extern int latencytop_enabled; 105 extern int sysctl_nr_open_min, sysctl_nr_open_max; 106 #ifndef CONFIG_MMU 107 extern int sysctl_nr_trim_pages; 108 #endif 109 #ifdef CONFIG_BLOCK 110 extern int blk_iopoll_enabled; 111 #endif 112 113 /* Constants used for minimum and maximum */ 114 #ifdef CONFIG_LOCKUP_DETECTOR 115 static int sixty = 60; 116 static int neg_one = -1; 117 #endif 118 119 static int zero; 120 static int __maybe_unused one = 1; 121 static int __maybe_unused two = 2; 122 static int __maybe_unused three = 3; 123 static unsigned long one_ul = 1; 124 static int one_hundred = 100; 125 #ifdef CONFIG_PRINTK 126 static int ten_thousand = 10000; 127 #endif 128 129 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 130 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 131 132 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 133 static int maxolduid = 65535; 134 static int minolduid; 135 static int min_percpu_pagelist_fract = 8; 136 137 static int ngroups_max = NGROUPS_MAX; 138 static const int cap_last_cap = CAP_LAST_CAP; 139 140 #ifdef CONFIG_INOTIFY_USER 141 #include <linux/inotify.h> 142 #endif 143 #ifdef CONFIG_SPARC 144 #include <asm/system.h> 145 #endif 146 147 #ifdef CONFIG_SPARC64 148 extern int sysctl_tsb_ratio; 149 #endif 150 151 #ifdef __hppa__ 152 extern int pwrsw_enabled; 153 extern int unaligned_enabled; 154 #endif 155 156 #ifdef CONFIG_IA64 157 extern int no_unaligned_warning; 158 extern int unaligned_dump_stack; 159 #endif 160 161 #ifdef CONFIG_PROC_SYSCTL 162 static int proc_do_cad_pid(struct ctl_table *table, int write, 163 void __user *buffer, size_t *lenp, loff_t *ppos); 164 static int proc_taint(struct ctl_table *table, int write, 165 void __user *buffer, size_t *lenp, loff_t *ppos); 166 #endif 167 168 #ifdef CONFIG_PRINTK 169 static int proc_dmesg_restrict(struct ctl_table *table, int write, 170 void __user *buffer, size_t *lenp, loff_t *ppos); 171 #endif 172 173 #ifdef CONFIG_MAGIC_SYSRQ 174 /* Note: sysrq code uses it's own private copy */ 175 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 176 177 static int sysrq_sysctl_handler(ctl_table *table, int write, 178 void __user *buffer, size_t *lenp, 179 loff_t *ppos) 180 { 181 int error; 182 183 error = proc_dointvec(table, write, buffer, lenp, ppos); 184 if (error) 185 return error; 186 187 if (write) 188 sysrq_toggle_support(__sysrq_enabled); 189 190 return 0; 191 } 192 193 #endif 194 195 static struct ctl_table root_table[]; 196 static struct ctl_table_root sysctl_table_root; 197 static struct ctl_table_header root_table_header = { 198 {{.count = 1, 199 .ctl_table = root_table, 200 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, 201 .root = &sysctl_table_root, 202 .set = &sysctl_table_root.default_set, 203 }; 204 static struct ctl_table_root sysctl_table_root = { 205 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 206 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 207 }; 208 209 static struct ctl_table kern_table[]; 210 static struct ctl_table vm_table[]; 211 static struct ctl_table fs_table[]; 212 static struct ctl_table debug_table[]; 213 static struct ctl_table dev_table[]; 214 extern struct ctl_table random_table[]; 215 #ifdef CONFIG_EPOLL 216 extern struct ctl_table epoll_table[]; 217 #endif 218 219 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 220 int sysctl_legacy_va_layout; 221 #endif 222 223 /* The default sysctl tables: */ 224 225 static struct ctl_table root_table[] = { 226 { 227 .procname = "kernel", 228 .mode = 0555, 229 .child = kern_table, 230 }, 231 { 232 .procname = "vm", 233 .mode = 0555, 234 .child = vm_table, 235 }, 236 { 237 .procname = "fs", 238 .mode = 0555, 239 .child = fs_table, 240 }, 241 { 242 .procname = "debug", 243 .mode = 0555, 244 .child = debug_table, 245 }, 246 { 247 .procname = "dev", 248 .mode = 0555, 249 .child = dev_table, 250 }, 251 { } 252 }; 253 254 #ifdef CONFIG_SCHED_DEBUG 255 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 256 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 257 static int min_wakeup_granularity_ns; /* 0 usecs */ 258 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 259 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 260 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 261 #endif 262 263 #ifdef CONFIG_COMPACTION 264 static int min_extfrag_threshold; 265 static int max_extfrag_threshold = 1000; 266 #endif 267 268 static struct ctl_table kern_table[] = { 269 { 270 .procname = "sched_child_runs_first", 271 .data = &sysctl_sched_child_runs_first, 272 .maxlen = sizeof(unsigned int), 273 .mode = 0644, 274 .proc_handler = proc_dointvec, 275 }, 276 #ifdef CONFIG_SCHED_DEBUG 277 { 278 .procname = "sched_min_granularity_ns", 279 .data = &sysctl_sched_min_granularity, 280 .maxlen = sizeof(unsigned int), 281 .mode = 0644, 282 .proc_handler = sched_proc_update_handler, 283 .extra1 = &min_sched_granularity_ns, 284 .extra2 = &max_sched_granularity_ns, 285 }, 286 { 287 .procname = "sched_latency_ns", 288 .data = &sysctl_sched_latency, 289 .maxlen = sizeof(unsigned int), 290 .mode = 0644, 291 .proc_handler = sched_proc_update_handler, 292 .extra1 = &min_sched_granularity_ns, 293 .extra2 = &max_sched_granularity_ns, 294 }, 295 { 296 .procname = "sched_wakeup_granularity_ns", 297 .data = &sysctl_sched_wakeup_granularity, 298 .maxlen = sizeof(unsigned int), 299 .mode = 0644, 300 .proc_handler = sched_proc_update_handler, 301 .extra1 = &min_wakeup_granularity_ns, 302 .extra2 = &max_wakeup_granularity_ns, 303 }, 304 { 305 .procname = "sched_tunable_scaling", 306 .data = &sysctl_sched_tunable_scaling, 307 .maxlen = sizeof(enum sched_tunable_scaling), 308 .mode = 0644, 309 .proc_handler = sched_proc_update_handler, 310 .extra1 = &min_sched_tunable_scaling, 311 .extra2 = &max_sched_tunable_scaling, 312 }, 313 { 314 .procname = "sched_migration_cost", 315 .data = &sysctl_sched_migration_cost, 316 .maxlen = sizeof(unsigned int), 317 .mode = 0644, 318 .proc_handler = proc_dointvec, 319 }, 320 { 321 .procname = "sched_nr_migrate", 322 .data = &sysctl_sched_nr_migrate, 323 .maxlen = sizeof(unsigned int), 324 .mode = 0644, 325 .proc_handler = proc_dointvec, 326 }, 327 { 328 .procname = "sched_time_avg", 329 .data = &sysctl_sched_time_avg, 330 .maxlen = sizeof(unsigned int), 331 .mode = 0644, 332 .proc_handler = proc_dointvec, 333 }, 334 { 335 .procname = "sched_shares_window", 336 .data = &sysctl_sched_shares_window, 337 .maxlen = sizeof(unsigned int), 338 .mode = 0644, 339 .proc_handler = proc_dointvec, 340 }, 341 { 342 .procname = "timer_migration", 343 .data = &sysctl_timer_migration, 344 .maxlen = sizeof(unsigned int), 345 .mode = 0644, 346 .proc_handler = proc_dointvec_minmax, 347 .extra1 = &zero, 348 .extra2 = &one, 349 }, 350 #endif 351 { 352 .procname = "sched_rt_period_us", 353 .data = &sysctl_sched_rt_period, 354 .maxlen = sizeof(unsigned int), 355 .mode = 0644, 356 .proc_handler = sched_rt_handler, 357 }, 358 { 359 .procname = "sched_rt_runtime_us", 360 .data = &sysctl_sched_rt_runtime, 361 .maxlen = sizeof(int), 362 .mode = 0644, 363 .proc_handler = sched_rt_handler, 364 }, 365 #ifdef CONFIG_SCHED_AUTOGROUP 366 { 367 .procname = "sched_autogroup_enabled", 368 .data = &sysctl_sched_autogroup_enabled, 369 .maxlen = sizeof(unsigned int), 370 .mode = 0644, 371 .proc_handler = proc_dointvec_minmax, 372 .extra1 = &zero, 373 .extra2 = &one, 374 }, 375 #endif 376 #ifdef CONFIG_CFS_BANDWIDTH 377 { 378 .procname = "sched_cfs_bandwidth_slice_us", 379 .data = &sysctl_sched_cfs_bandwidth_slice, 380 .maxlen = sizeof(unsigned int), 381 .mode = 0644, 382 .proc_handler = proc_dointvec_minmax, 383 .extra1 = &one, 384 }, 385 #endif 386 #ifdef CONFIG_PROVE_LOCKING 387 { 388 .procname = "prove_locking", 389 .data = &prove_locking, 390 .maxlen = sizeof(int), 391 .mode = 0644, 392 .proc_handler = proc_dointvec, 393 }, 394 #endif 395 #ifdef CONFIG_LOCK_STAT 396 { 397 .procname = "lock_stat", 398 .data = &lock_stat, 399 .maxlen = sizeof(int), 400 .mode = 0644, 401 .proc_handler = proc_dointvec, 402 }, 403 #endif 404 { 405 .procname = "panic", 406 .data = &panic_timeout, 407 .maxlen = sizeof(int), 408 .mode = 0644, 409 .proc_handler = proc_dointvec, 410 }, 411 { 412 .procname = "core_uses_pid", 413 .data = &core_uses_pid, 414 .maxlen = sizeof(int), 415 .mode = 0644, 416 .proc_handler = proc_dointvec, 417 }, 418 { 419 .procname = "core_pattern", 420 .data = core_pattern, 421 .maxlen = CORENAME_MAX_SIZE, 422 .mode = 0644, 423 .proc_handler = proc_dostring, 424 }, 425 { 426 .procname = "core_pipe_limit", 427 .data = &core_pipe_limit, 428 .maxlen = sizeof(unsigned int), 429 .mode = 0644, 430 .proc_handler = proc_dointvec, 431 }, 432 #ifdef CONFIG_PROC_SYSCTL 433 { 434 .procname = "tainted", 435 .maxlen = sizeof(long), 436 .mode = 0644, 437 .proc_handler = proc_taint, 438 }, 439 #endif 440 #ifdef CONFIG_LATENCYTOP 441 { 442 .procname = "latencytop", 443 .data = &latencytop_enabled, 444 .maxlen = sizeof(int), 445 .mode = 0644, 446 .proc_handler = proc_dointvec, 447 }, 448 #endif 449 #ifdef CONFIG_BLK_DEV_INITRD 450 { 451 .procname = "real-root-dev", 452 .data = &real_root_dev, 453 .maxlen = sizeof(int), 454 .mode = 0644, 455 .proc_handler = proc_dointvec, 456 }, 457 #endif 458 { 459 .procname = "print-fatal-signals", 460 .data = &print_fatal_signals, 461 .maxlen = sizeof(int), 462 .mode = 0644, 463 .proc_handler = proc_dointvec, 464 }, 465 #ifdef CONFIG_SPARC 466 { 467 .procname = "reboot-cmd", 468 .data = reboot_command, 469 .maxlen = 256, 470 .mode = 0644, 471 .proc_handler = proc_dostring, 472 }, 473 { 474 .procname = "stop-a", 475 .data = &stop_a_enabled, 476 .maxlen = sizeof (int), 477 .mode = 0644, 478 .proc_handler = proc_dointvec, 479 }, 480 { 481 .procname = "scons-poweroff", 482 .data = &scons_pwroff, 483 .maxlen = sizeof (int), 484 .mode = 0644, 485 .proc_handler = proc_dointvec, 486 }, 487 #endif 488 #ifdef CONFIG_SPARC64 489 { 490 .procname = "tsb-ratio", 491 .data = &sysctl_tsb_ratio, 492 .maxlen = sizeof (int), 493 .mode = 0644, 494 .proc_handler = proc_dointvec, 495 }, 496 #endif 497 #ifdef __hppa__ 498 { 499 .procname = "soft-power", 500 .data = &pwrsw_enabled, 501 .maxlen = sizeof (int), 502 .mode = 0644, 503 .proc_handler = proc_dointvec, 504 }, 505 { 506 .procname = "unaligned-trap", 507 .data = &unaligned_enabled, 508 .maxlen = sizeof (int), 509 .mode = 0644, 510 .proc_handler = proc_dointvec, 511 }, 512 #endif 513 { 514 .procname = "ctrl-alt-del", 515 .data = &C_A_D, 516 .maxlen = sizeof(int), 517 .mode = 0644, 518 .proc_handler = proc_dointvec, 519 }, 520 #ifdef CONFIG_FUNCTION_TRACER 521 { 522 .procname = "ftrace_enabled", 523 .data = &ftrace_enabled, 524 .maxlen = sizeof(int), 525 .mode = 0644, 526 .proc_handler = ftrace_enable_sysctl, 527 }, 528 #endif 529 #ifdef CONFIG_STACK_TRACER 530 { 531 .procname = "stack_tracer_enabled", 532 .data = &stack_tracer_enabled, 533 .maxlen = sizeof(int), 534 .mode = 0644, 535 .proc_handler = stack_trace_sysctl, 536 }, 537 #endif 538 #ifdef CONFIG_TRACING 539 { 540 .procname = "ftrace_dump_on_oops", 541 .data = &ftrace_dump_on_oops, 542 .maxlen = sizeof(int), 543 .mode = 0644, 544 .proc_handler = proc_dointvec, 545 }, 546 #endif 547 #ifdef CONFIG_MODULES 548 { 549 .procname = "modprobe", 550 .data = &modprobe_path, 551 .maxlen = KMOD_PATH_LEN, 552 .mode = 0644, 553 .proc_handler = proc_dostring, 554 }, 555 { 556 .procname = "modules_disabled", 557 .data = &modules_disabled, 558 .maxlen = sizeof(int), 559 .mode = 0644, 560 /* only handle a transition from default "0" to "1" */ 561 .proc_handler = proc_dointvec_minmax, 562 .extra1 = &one, 563 .extra2 = &one, 564 }, 565 #endif 566 #ifdef CONFIG_HOTPLUG 567 { 568 .procname = "hotplug", 569 .data = &uevent_helper, 570 .maxlen = UEVENT_HELPER_PATH_LEN, 571 .mode = 0644, 572 .proc_handler = proc_dostring, 573 }, 574 #endif 575 #ifdef CONFIG_CHR_DEV_SG 576 { 577 .procname = "sg-big-buff", 578 .data = &sg_big_buff, 579 .maxlen = sizeof (int), 580 .mode = 0444, 581 .proc_handler = proc_dointvec, 582 }, 583 #endif 584 #ifdef CONFIG_BSD_PROCESS_ACCT 585 { 586 .procname = "acct", 587 .data = &acct_parm, 588 .maxlen = 3*sizeof(int), 589 .mode = 0644, 590 .proc_handler = proc_dointvec, 591 }, 592 #endif 593 #ifdef CONFIG_MAGIC_SYSRQ 594 { 595 .procname = "sysrq", 596 .data = &__sysrq_enabled, 597 .maxlen = sizeof (int), 598 .mode = 0644, 599 .proc_handler = sysrq_sysctl_handler, 600 }, 601 #endif 602 #ifdef CONFIG_PROC_SYSCTL 603 { 604 .procname = "cad_pid", 605 .data = NULL, 606 .maxlen = sizeof (int), 607 .mode = 0600, 608 .proc_handler = proc_do_cad_pid, 609 }, 610 #endif 611 { 612 .procname = "threads-max", 613 .data = &max_threads, 614 .maxlen = sizeof(int), 615 .mode = 0644, 616 .proc_handler = proc_dointvec, 617 }, 618 { 619 .procname = "random", 620 .mode = 0555, 621 .child = random_table, 622 }, 623 { 624 .procname = "usermodehelper", 625 .mode = 0555, 626 .child = usermodehelper_table, 627 }, 628 { 629 .procname = "overflowuid", 630 .data = &overflowuid, 631 .maxlen = sizeof(int), 632 .mode = 0644, 633 .proc_handler = proc_dointvec_minmax, 634 .extra1 = &minolduid, 635 .extra2 = &maxolduid, 636 }, 637 { 638 .procname = "overflowgid", 639 .data = &overflowgid, 640 .maxlen = sizeof(int), 641 .mode = 0644, 642 .proc_handler = proc_dointvec_minmax, 643 .extra1 = &minolduid, 644 .extra2 = &maxolduid, 645 }, 646 #ifdef CONFIG_S390 647 #ifdef CONFIG_MATHEMU 648 { 649 .procname = "ieee_emulation_warnings", 650 .data = &sysctl_ieee_emulation_warnings, 651 .maxlen = sizeof(int), 652 .mode = 0644, 653 .proc_handler = proc_dointvec, 654 }, 655 #endif 656 { 657 .procname = "userprocess_debug", 658 .data = &show_unhandled_signals, 659 .maxlen = sizeof(int), 660 .mode = 0644, 661 .proc_handler = proc_dointvec, 662 }, 663 #endif 664 { 665 .procname = "pid_max", 666 .data = &pid_max, 667 .maxlen = sizeof (int), 668 .mode = 0644, 669 .proc_handler = proc_dointvec_minmax, 670 .extra1 = &pid_max_min, 671 .extra2 = &pid_max_max, 672 }, 673 { 674 .procname = "panic_on_oops", 675 .data = &panic_on_oops, 676 .maxlen = sizeof(int), 677 .mode = 0644, 678 .proc_handler = proc_dointvec, 679 }, 680 #if defined CONFIG_PRINTK 681 { 682 .procname = "printk", 683 .data = &console_loglevel, 684 .maxlen = 4*sizeof(int), 685 .mode = 0644, 686 .proc_handler = proc_dointvec, 687 }, 688 { 689 .procname = "printk_ratelimit", 690 .data = &printk_ratelimit_state.interval, 691 .maxlen = sizeof(int), 692 .mode = 0644, 693 .proc_handler = proc_dointvec_jiffies, 694 }, 695 { 696 .procname = "printk_ratelimit_burst", 697 .data = &printk_ratelimit_state.burst, 698 .maxlen = sizeof(int), 699 .mode = 0644, 700 .proc_handler = proc_dointvec, 701 }, 702 { 703 .procname = "printk_delay", 704 .data = &printk_delay_msec, 705 .maxlen = sizeof(int), 706 .mode = 0644, 707 .proc_handler = proc_dointvec_minmax, 708 .extra1 = &zero, 709 .extra2 = &ten_thousand, 710 }, 711 { 712 .procname = "dmesg_restrict", 713 .data = &dmesg_restrict, 714 .maxlen = sizeof(int), 715 .mode = 0644, 716 .proc_handler = proc_dointvec_minmax, 717 .extra1 = &zero, 718 .extra2 = &one, 719 }, 720 { 721 .procname = "kptr_restrict", 722 .data = &kptr_restrict, 723 .maxlen = sizeof(int), 724 .mode = 0644, 725 .proc_handler = proc_dmesg_restrict, 726 .extra1 = &zero, 727 .extra2 = &two, 728 }, 729 #endif 730 { 731 .procname = "ngroups_max", 732 .data = &ngroups_max, 733 .maxlen = sizeof (int), 734 .mode = 0444, 735 .proc_handler = proc_dointvec, 736 }, 737 { 738 .procname = "cap_last_cap", 739 .data = (void *)&cap_last_cap, 740 .maxlen = sizeof(int), 741 .mode = 0444, 742 .proc_handler = proc_dointvec, 743 }, 744 #if defined(CONFIG_LOCKUP_DETECTOR) 745 { 746 .procname = "watchdog", 747 .data = &watchdog_enabled, 748 .maxlen = sizeof (int), 749 .mode = 0644, 750 .proc_handler = proc_dowatchdog, 751 .extra1 = &zero, 752 .extra2 = &one, 753 }, 754 { 755 .procname = "watchdog_thresh", 756 .data = &watchdog_thresh, 757 .maxlen = sizeof(int), 758 .mode = 0644, 759 .proc_handler = proc_dowatchdog, 760 .extra1 = &neg_one, 761 .extra2 = &sixty, 762 }, 763 { 764 .procname = "softlockup_panic", 765 .data = &softlockup_panic, 766 .maxlen = sizeof(int), 767 .mode = 0644, 768 .proc_handler = proc_dointvec_minmax, 769 .extra1 = &zero, 770 .extra2 = &one, 771 }, 772 { 773 .procname = "nmi_watchdog", 774 .data = &watchdog_enabled, 775 .maxlen = sizeof (int), 776 .mode = 0644, 777 .proc_handler = proc_dowatchdog, 778 .extra1 = &zero, 779 .extra2 = &one, 780 }, 781 #endif 782 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 783 { 784 .procname = "unknown_nmi_panic", 785 .data = &unknown_nmi_panic, 786 .maxlen = sizeof (int), 787 .mode = 0644, 788 .proc_handler = proc_dointvec, 789 }, 790 #endif 791 #if defined(CONFIG_X86) 792 { 793 .procname = "panic_on_unrecovered_nmi", 794 .data = &panic_on_unrecovered_nmi, 795 .maxlen = sizeof(int), 796 .mode = 0644, 797 .proc_handler = proc_dointvec, 798 }, 799 { 800 .procname = "panic_on_io_nmi", 801 .data = &panic_on_io_nmi, 802 .maxlen = sizeof(int), 803 .mode = 0644, 804 .proc_handler = proc_dointvec, 805 }, 806 { 807 .procname = "bootloader_type", 808 .data = &bootloader_type, 809 .maxlen = sizeof (int), 810 .mode = 0444, 811 .proc_handler = proc_dointvec, 812 }, 813 { 814 .procname = "bootloader_version", 815 .data = &bootloader_version, 816 .maxlen = sizeof (int), 817 .mode = 0444, 818 .proc_handler = proc_dointvec, 819 }, 820 { 821 .procname = "kstack_depth_to_print", 822 .data = &kstack_depth_to_print, 823 .maxlen = sizeof(int), 824 .mode = 0644, 825 .proc_handler = proc_dointvec, 826 }, 827 { 828 .procname = "io_delay_type", 829 .data = &io_delay_type, 830 .maxlen = sizeof(int), 831 .mode = 0644, 832 .proc_handler = proc_dointvec, 833 }, 834 #endif 835 #if defined(CONFIG_MMU) 836 { 837 .procname = "randomize_va_space", 838 .data = &randomize_va_space, 839 .maxlen = sizeof(int), 840 .mode = 0644, 841 .proc_handler = proc_dointvec, 842 }, 843 #endif 844 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 845 { 846 .procname = "spin_retry", 847 .data = &spin_retry, 848 .maxlen = sizeof (int), 849 .mode = 0644, 850 .proc_handler = proc_dointvec, 851 }, 852 #endif 853 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 854 { 855 .procname = "acpi_video_flags", 856 .data = &acpi_realmode_flags, 857 .maxlen = sizeof (unsigned long), 858 .mode = 0644, 859 .proc_handler = proc_doulongvec_minmax, 860 }, 861 #endif 862 #ifdef CONFIG_IA64 863 { 864 .procname = "ignore-unaligned-usertrap", 865 .data = &no_unaligned_warning, 866 .maxlen = sizeof (int), 867 .mode = 0644, 868 .proc_handler = proc_dointvec, 869 }, 870 { 871 .procname = "unaligned-dump-stack", 872 .data = &unaligned_dump_stack, 873 .maxlen = sizeof (int), 874 .mode = 0644, 875 .proc_handler = proc_dointvec, 876 }, 877 #endif 878 #ifdef CONFIG_DETECT_HUNG_TASK 879 { 880 .procname = "hung_task_panic", 881 .data = &sysctl_hung_task_panic, 882 .maxlen = sizeof(int), 883 .mode = 0644, 884 .proc_handler = proc_dointvec_minmax, 885 .extra1 = &zero, 886 .extra2 = &one, 887 }, 888 { 889 .procname = "hung_task_check_count", 890 .data = &sysctl_hung_task_check_count, 891 .maxlen = sizeof(unsigned long), 892 .mode = 0644, 893 .proc_handler = proc_doulongvec_minmax, 894 }, 895 { 896 .procname = "hung_task_timeout_secs", 897 .data = &sysctl_hung_task_timeout_secs, 898 .maxlen = sizeof(unsigned long), 899 .mode = 0644, 900 .proc_handler = proc_dohung_task_timeout_secs, 901 }, 902 { 903 .procname = "hung_task_warnings", 904 .data = &sysctl_hung_task_warnings, 905 .maxlen = sizeof(unsigned long), 906 .mode = 0644, 907 .proc_handler = proc_doulongvec_minmax, 908 }, 909 #endif 910 #ifdef CONFIG_COMPAT 911 { 912 .procname = "compat-log", 913 .data = &compat_log, 914 .maxlen = sizeof (int), 915 .mode = 0644, 916 .proc_handler = proc_dointvec, 917 }, 918 #endif 919 #ifdef CONFIG_RT_MUTEXES 920 { 921 .procname = "max_lock_depth", 922 .data = &max_lock_depth, 923 .maxlen = sizeof(int), 924 .mode = 0644, 925 .proc_handler = proc_dointvec, 926 }, 927 #endif 928 { 929 .procname = "poweroff_cmd", 930 .data = &poweroff_cmd, 931 .maxlen = POWEROFF_CMD_PATH_LEN, 932 .mode = 0644, 933 .proc_handler = proc_dostring, 934 }, 935 #ifdef CONFIG_KEYS 936 { 937 .procname = "keys", 938 .mode = 0555, 939 .child = key_sysctls, 940 }, 941 #endif 942 #ifdef CONFIG_RCU_TORTURE_TEST 943 { 944 .procname = "rcutorture_runnable", 945 .data = &rcutorture_runnable, 946 .maxlen = sizeof(int), 947 .mode = 0644, 948 .proc_handler = proc_dointvec, 949 }, 950 #endif 951 #ifdef CONFIG_PERF_EVENTS 952 /* 953 * User-space scripts rely on the existence of this file 954 * as a feature check for perf_events being enabled. 955 * 956 * So it's an ABI, do not remove! 957 */ 958 { 959 .procname = "perf_event_paranoid", 960 .data = &sysctl_perf_event_paranoid, 961 .maxlen = sizeof(sysctl_perf_event_paranoid), 962 .mode = 0644, 963 .proc_handler = proc_dointvec, 964 }, 965 { 966 .procname = "perf_event_mlock_kb", 967 .data = &sysctl_perf_event_mlock, 968 .maxlen = sizeof(sysctl_perf_event_mlock), 969 .mode = 0644, 970 .proc_handler = proc_dointvec, 971 }, 972 { 973 .procname = "perf_event_max_sample_rate", 974 .data = &sysctl_perf_event_sample_rate, 975 .maxlen = sizeof(sysctl_perf_event_sample_rate), 976 .mode = 0644, 977 .proc_handler = perf_proc_update_handler, 978 }, 979 #endif 980 #ifdef CONFIG_KMEMCHECK 981 { 982 .procname = "kmemcheck", 983 .data = &kmemcheck_enabled, 984 .maxlen = sizeof(int), 985 .mode = 0644, 986 .proc_handler = proc_dointvec, 987 }, 988 #endif 989 #ifdef CONFIG_BLOCK 990 { 991 .procname = "blk_iopoll", 992 .data = &blk_iopoll_enabled, 993 .maxlen = sizeof(int), 994 .mode = 0644, 995 .proc_handler = proc_dointvec, 996 }, 997 #endif 998 { } 999 }; 1000 1001 static struct ctl_table vm_table[] = { 1002 { 1003 .procname = "overcommit_memory", 1004 .data = &sysctl_overcommit_memory, 1005 .maxlen = sizeof(sysctl_overcommit_memory), 1006 .mode = 0644, 1007 .proc_handler = proc_dointvec_minmax, 1008 .extra1 = &zero, 1009 .extra2 = &two, 1010 }, 1011 { 1012 .procname = "panic_on_oom", 1013 .data = &sysctl_panic_on_oom, 1014 .maxlen = sizeof(sysctl_panic_on_oom), 1015 .mode = 0644, 1016 .proc_handler = proc_dointvec_minmax, 1017 .extra1 = &zero, 1018 .extra2 = &two, 1019 }, 1020 { 1021 .procname = "oom_kill_allocating_task", 1022 .data = &sysctl_oom_kill_allocating_task, 1023 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1024 .mode = 0644, 1025 .proc_handler = proc_dointvec, 1026 }, 1027 { 1028 .procname = "oom_dump_tasks", 1029 .data = &sysctl_oom_dump_tasks, 1030 .maxlen = sizeof(sysctl_oom_dump_tasks), 1031 .mode = 0644, 1032 .proc_handler = proc_dointvec, 1033 }, 1034 { 1035 .procname = "overcommit_ratio", 1036 .data = &sysctl_overcommit_ratio, 1037 .maxlen = sizeof(sysctl_overcommit_ratio), 1038 .mode = 0644, 1039 .proc_handler = proc_dointvec, 1040 }, 1041 { 1042 .procname = "page-cluster", 1043 .data = &page_cluster, 1044 .maxlen = sizeof(int), 1045 .mode = 0644, 1046 .proc_handler = proc_dointvec_minmax, 1047 .extra1 = &zero, 1048 }, 1049 { 1050 .procname = "dirty_background_ratio", 1051 .data = &dirty_background_ratio, 1052 .maxlen = sizeof(dirty_background_ratio), 1053 .mode = 0644, 1054 .proc_handler = dirty_background_ratio_handler, 1055 .extra1 = &zero, 1056 .extra2 = &one_hundred, 1057 }, 1058 { 1059 .procname = "dirty_background_bytes", 1060 .data = &dirty_background_bytes, 1061 .maxlen = sizeof(dirty_background_bytes), 1062 .mode = 0644, 1063 .proc_handler = dirty_background_bytes_handler, 1064 .extra1 = &one_ul, 1065 }, 1066 { 1067 .procname = "dirty_ratio", 1068 .data = &vm_dirty_ratio, 1069 .maxlen = sizeof(vm_dirty_ratio), 1070 .mode = 0644, 1071 .proc_handler = dirty_ratio_handler, 1072 .extra1 = &zero, 1073 .extra2 = &one_hundred, 1074 }, 1075 { 1076 .procname = "dirty_bytes", 1077 .data = &vm_dirty_bytes, 1078 .maxlen = sizeof(vm_dirty_bytes), 1079 .mode = 0644, 1080 .proc_handler = dirty_bytes_handler, 1081 .extra1 = &dirty_bytes_min, 1082 }, 1083 { 1084 .procname = "dirty_writeback_centisecs", 1085 .data = &dirty_writeback_interval, 1086 .maxlen = sizeof(dirty_writeback_interval), 1087 .mode = 0644, 1088 .proc_handler = dirty_writeback_centisecs_handler, 1089 }, 1090 { 1091 .procname = "dirty_expire_centisecs", 1092 .data = &dirty_expire_interval, 1093 .maxlen = sizeof(dirty_expire_interval), 1094 .mode = 0644, 1095 .proc_handler = proc_dointvec_minmax, 1096 .extra1 = &zero, 1097 }, 1098 { 1099 .procname = "nr_pdflush_threads", 1100 .data = &nr_pdflush_threads, 1101 .maxlen = sizeof nr_pdflush_threads, 1102 .mode = 0444 /* read-only*/, 1103 .proc_handler = proc_dointvec, 1104 }, 1105 { 1106 .procname = "swappiness", 1107 .data = &vm_swappiness, 1108 .maxlen = sizeof(vm_swappiness), 1109 .mode = 0644, 1110 .proc_handler = proc_dointvec_minmax, 1111 .extra1 = &zero, 1112 .extra2 = &one_hundred, 1113 }, 1114 #ifdef CONFIG_HUGETLB_PAGE 1115 { 1116 .procname = "nr_hugepages", 1117 .data = NULL, 1118 .maxlen = sizeof(unsigned long), 1119 .mode = 0644, 1120 .proc_handler = hugetlb_sysctl_handler, 1121 .extra1 = (void *)&hugetlb_zero, 1122 .extra2 = (void *)&hugetlb_infinity, 1123 }, 1124 #ifdef CONFIG_NUMA 1125 { 1126 .procname = "nr_hugepages_mempolicy", 1127 .data = NULL, 1128 .maxlen = sizeof(unsigned long), 1129 .mode = 0644, 1130 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1131 .extra1 = (void *)&hugetlb_zero, 1132 .extra2 = (void *)&hugetlb_infinity, 1133 }, 1134 #endif 1135 { 1136 .procname = "hugetlb_shm_group", 1137 .data = &sysctl_hugetlb_shm_group, 1138 .maxlen = sizeof(gid_t), 1139 .mode = 0644, 1140 .proc_handler = proc_dointvec, 1141 }, 1142 { 1143 .procname = "hugepages_treat_as_movable", 1144 .data = &hugepages_treat_as_movable, 1145 .maxlen = sizeof(int), 1146 .mode = 0644, 1147 .proc_handler = hugetlb_treat_movable_handler, 1148 }, 1149 { 1150 .procname = "nr_overcommit_hugepages", 1151 .data = NULL, 1152 .maxlen = sizeof(unsigned long), 1153 .mode = 0644, 1154 .proc_handler = hugetlb_overcommit_handler, 1155 .extra1 = (void *)&hugetlb_zero, 1156 .extra2 = (void *)&hugetlb_infinity, 1157 }, 1158 #endif 1159 { 1160 .procname = "lowmem_reserve_ratio", 1161 .data = &sysctl_lowmem_reserve_ratio, 1162 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1163 .mode = 0644, 1164 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1165 }, 1166 { 1167 .procname = "drop_caches", 1168 .data = &sysctl_drop_caches, 1169 .maxlen = sizeof(int), 1170 .mode = 0644, 1171 .proc_handler = drop_caches_sysctl_handler, 1172 .extra1 = &one, 1173 .extra2 = &three, 1174 }, 1175 #ifdef CONFIG_COMPACTION 1176 { 1177 .procname = "compact_memory", 1178 .data = &sysctl_compact_memory, 1179 .maxlen = sizeof(int), 1180 .mode = 0200, 1181 .proc_handler = sysctl_compaction_handler, 1182 }, 1183 { 1184 .procname = "extfrag_threshold", 1185 .data = &sysctl_extfrag_threshold, 1186 .maxlen = sizeof(int), 1187 .mode = 0644, 1188 .proc_handler = sysctl_extfrag_handler, 1189 .extra1 = &min_extfrag_threshold, 1190 .extra2 = &max_extfrag_threshold, 1191 }, 1192 1193 #endif /* CONFIG_COMPACTION */ 1194 { 1195 .procname = "min_free_kbytes", 1196 .data = &min_free_kbytes, 1197 .maxlen = sizeof(min_free_kbytes), 1198 .mode = 0644, 1199 .proc_handler = min_free_kbytes_sysctl_handler, 1200 .extra1 = &zero, 1201 }, 1202 { 1203 .procname = "percpu_pagelist_fraction", 1204 .data = &percpu_pagelist_fraction, 1205 .maxlen = sizeof(percpu_pagelist_fraction), 1206 .mode = 0644, 1207 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1208 .extra1 = &min_percpu_pagelist_fract, 1209 }, 1210 #ifdef CONFIG_MMU 1211 { 1212 .procname = "max_map_count", 1213 .data = &sysctl_max_map_count, 1214 .maxlen = sizeof(sysctl_max_map_count), 1215 .mode = 0644, 1216 .proc_handler = proc_dointvec_minmax, 1217 .extra1 = &zero, 1218 }, 1219 #else 1220 { 1221 .procname = "nr_trim_pages", 1222 .data = &sysctl_nr_trim_pages, 1223 .maxlen = sizeof(sysctl_nr_trim_pages), 1224 .mode = 0644, 1225 .proc_handler = proc_dointvec_minmax, 1226 .extra1 = &zero, 1227 }, 1228 #endif 1229 { 1230 .procname = "laptop_mode", 1231 .data = &laptop_mode, 1232 .maxlen = sizeof(laptop_mode), 1233 .mode = 0644, 1234 .proc_handler = proc_dointvec_jiffies, 1235 }, 1236 { 1237 .procname = "block_dump", 1238 .data = &block_dump, 1239 .maxlen = sizeof(block_dump), 1240 .mode = 0644, 1241 .proc_handler = proc_dointvec, 1242 .extra1 = &zero, 1243 }, 1244 { 1245 .procname = "vfs_cache_pressure", 1246 .data = &sysctl_vfs_cache_pressure, 1247 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1248 .mode = 0644, 1249 .proc_handler = proc_dointvec, 1250 .extra1 = &zero, 1251 }, 1252 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1253 { 1254 .procname = "legacy_va_layout", 1255 .data = &sysctl_legacy_va_layout, 1256 .maxlen = sizeof(sysctl_legacy_va_layout), 1257 .mode = 0644, 1258 .proc_handler = proc_dointvec, 1259 .extra1 = &zero, 1260 }, 1261 #endif 1262 #ifdef CONFIG_NUMA 1263 { 1264 .procname = "zone_reclaim_mode", 1265 .data = &zone_reclaim_mode, 1266 .maxlen = sizeof(zone_reclaim_mode), 1267 .mode = 0644, 1268 .proc_handler = proc_dointvec, 1269 .extra1 = &zero, 1270 }, 1271 { 1272 .procname = "min_unmapped_ratio", 1273 .data = &sysctl_min_unmapped_ratio, 1274 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1275 .mode = 0644, 1276 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1277 .extra1 = &zero, 1278 .extra2 = &one_hundred, 1279 }, 1280 { 1281 .procname = "min_slab_ratio", 1282 .data = &sysctl_min_slab_ratio, 1283 .maxlen = sizeof(sysctl_min_slab_ratio), 1284 .mode = 0644, 1285 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1286 .extra1 = &zero, 1287 .extra2 = &one_hundred, 1288 }, 1289 #endif 1290 #ifdef CONFIG_SMP 1291 { 1292 .procname = "stat_interval", 1293 .data = &sysctl_stat_interval, 1294 .maxlen = sizeof(sysctl_stat_interval), 1295 .mode = 0644, 1296 .proc_handler = proc_dointvec_jiffies, 1297 }, 1298 #endif 1299 #ifdef CONFIG_MMU 1300 { 1301 .procname = "mmap_min_addr", 1302 .data = &dac_mmap_min_addr, 1303 .maxlen = sizeof(unsigned long), 1304 .mode = 0644, 1305 .proc_handler = mmap_min_addr_handler, 1306 }, 1307 #endif 1308 #ifdef CONFIG_NUMA 1309 { 1310 .procname = "numa_zonelist_order", 1311 .data = &numa_zonelist_order, 1312 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1313 .mode = 0644, 1314 .proc_handler = numa_zonelist_order_handler, 1315 }, 1316 #endif 1317 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1318 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1319 { 1320 .procname = "vdso_enabled", 1321 .data = &vdso_enabled, 1322 .maxlen = sizeof(vdso_enabled), 1323 .mode = 0644, 1324 .proc_handler = proc_dointvec, 1325 .extra1 = &zero, 1326 }, 1327 #endif 1328 #ifdef CONFIG_HIGHMEM 1329 { 1330 .procname = "highmem_is_dirtyable", 1331 .data = &vm_highmem_is_dirtyable, 1332 .maxlen = sizeof(vm_highmem_is_dirtyable), 1333 .mode = 0644, 1334 .proc_handler = proc_dointvec_minmax, 1335 .extra1 = &zero, 1336 .extra2 = &one, 1337 }, 1338 #endif 1339 { 1340 .procname = "scan_unevictable_pages", 1341 .data = &scan_unevictable_pages, 1342 .maxlen = sizeof(scan_unevictable_pages), 1343 .mode = 0644, 1344 .proc_handler = scan_unevictable_handler, 1345 }, 1346 #ifdef CONFIG_MEMORY_FAILURE 1347 { 1348 .procname = "memory_failure_early_kill", 1349 .data = &sysctl_memory_failure_early_kill, 1350 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1351 .mode = 0644, 1352 .proc_handler = proc_dointvec_minmax, 1353 .extra1 = &zero, 1354 .extra2 = &one, 1355 }, 1356 { 1357 .procname = "memory_failure_recovery", 1358 .data = &sysctl_memory_failure_recovery, 1359 .maxlen = sizeof(sysctl_memory_failure_recovery), 1360 .mode = 0644, 1361 .proc_handler = proc_dointvec_minmax, 1362 .extra1 = &zero, 1363 .extra2 = &one, 1364 }, 1365 #endif 1366 { } 1367 }; 1368 1369 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1370 static struct ctl_table binfmt_misc_table[] = { 1371 { } 1372 }; 1373 #endif 1374 1375 static struct ctl_table fs_table[] = { 1376 { 1377 .procname = "inode-nr", 1378 .data = &inodes_stat, 1379 .maxlen = 2*sizeof(int), 1380 .mode = 0444, 1381 .proc_handler = proc_nr_inodes, 1382 }, 1383 { 1384 .procname = "inode-state", 1385 .data = &inodes_stat, 1386 .maxlen = 7*sizeof(int), 1387 .mode = 0444, 1388 .proc_handler = proc_nr_inodes, 1389 }, 1390 { 1391 .procname = "file-nr", 1392 .data = &files_stat, 1393 .maxlen = sizeof(files_stat), 1394 .mode = 0444, 1395 .proc_handler = proc_nr_files, 1396 }, 1397 { 1398 .procname = "file-max", 1399 .data = &files_stat.max_files, 1400 .maxlen = sizeof(files_stat.max_files), 1401 .mode = 0644, 1402 .proc_handler = proc_doulongvec_minmax, 1403 }, 1404 { 1405 .procname = "nr_open", 1406 .data = &sysctl_nr_open, 1407 .maxlen = sizeof(int), 1408 .mode = 0644, 1409 .proc_handler = proc_dointvec_minmax, 1410 .extra1 = &sysctl_nr_open_min, 1411 .extra2 = &sysctl_nr_open_max, 1412 }, 1413 { 1414 .procname = "dentry-state", 1415 .data = &dentry_stat, 1416 .maxlen = 6*sizeof(int), 1417 .mode = 0444, 1418 .proc_handler = proc_nr_dentry, 1419 }, 1420 { 1421 .procname = "overflowuid", 1422 .data = &fs_overflowuid, 1423 .maxlen = sizeof(int), 1424 .mode = 0644, 1425 .proc_handler = proc_dointvec_minmax, 1426 .extra1 = &minolduid, 1427 .extra2 = &maxolduid, 1428 }, 1429 { 1430 .procname = "overflowgid", 1431 .data = &fs_overflowgid, 1432 .maxlen = sizeof(int), 1433 .mode = 0644, 1434 .proc_handler = proc_dointvec_minmax, 1435 .extra1 = &minolduid, 1436 .extra2 = &maxolduid, 1437 }, 1438 #ifdef CONFIG_FILE_LOCKING 1439 { 1440 .procname = "leases-enable", 1441 .data = &leases_enable, 1442 .maxlen = sizeof(int), 1443 .mode = 0644, 1444 .proc_handler = proc_dointvec, 1445 }, 1446 #endif 1447 #ifdef CONFIG_DNOTIFY 1448 { 1449 .procname = "dir-notify-enable", 1450 .data = &dir_notify_enable, 1451 .maxlen = sizeof(int), 1452 .mode = 0644, 1453 .proc_handler = proc_dointvec, 1454 }, 1455 #endif 1456 #ifdef CONFIG_MMU 1457 #ifdef CONFIG_FILE_LOCKING 1458 { 1459 .procname = "lease-break-time", 1460 .data = &lease_break_time, 1461 .maxlen = sizeof(int), 1462 .mode = 0644, 1463 .proc_handler = proc_dointvec, 1464 }, 1465 #endif 1466 #ifdef CONFIG_AIO 1467 { 1468 .procname = "aio-nr", 1469 .data = &aio_nr, 1470 .maxlen = sizeof(aio_nr), 1471 .mode = 0444, 1472 .proc_handler = proc_doulongvec_minmax, 1473 }, 1474 { 1475 .procname = "aio-max-nr", 1476 .data = &aio_max_nr, 1477 .maxlen = sizeof(aio_max_nr), 1478 .mode = 0644, 1479 .proc_handler = proc_doulongvec_minmax, 1480 }, 1481 #endif /* CONFIG_AIO */ 1482 #ifdef CONFIG_INOTIFY_USER 1483 { 1484 .procname = "inotify", 1485 .mode = 0555, 1486 .child = inotify_table, 1487 }, 1488 #endif 1489 #ifdef CONFIG_EPOLL 1490 { 1491 .procname = "epoll", 1492 .mode = 0555, 1493 .child = epoll_table, 1494 }, 1495 #endif 1496 #endif 1497 { 1498 .procname = "suid_dumpable", 1499 .data = &suid_dumpable, 1500 .maxlen = sizeof(int), 1501 .mode = 0644, 1502 .proc_handler = proc_dointvec_minmax, 1503 .extra1 = &zero, 1504 .extra2 = &two, 1505 }, 1506 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1507 { 1508 .procname = "binfmt_misc", 1509 .mode = 0555, 1510 .child = binfmt_misc_table, 1511 }, 1512 #endif 1513 { 1514 .procname = "pipe-max-size", 1515 .data = &pipe_max_size, 1516 .maxlen = sizeof(int), 1517 .mode = 0644, 1518 .proc_handler = &pipe_proc_fn, 1519 .extra1 = &pipe_min_size, 1520 }, 1521 { } 1522 }; 1523 1524 static struct ctl_table debug_table[] = { 1525 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1526 defined(CONFIG_S390) || defined(CONFIG_TILE) 1527 { 1528 .procname = "exception-trace", 1529 .data = &show_unhandled_signals, 1530 .maxlen = sizeof(int), 1531 .mode = 0644, 1532 .proc_handler = proc_dointvec 1533 }, 1534 #endif 1535 #if defined(CONFIG_OPTPROBES) 1536 { 1537 .procname = "kprobes-optimization", 1538 .data = &sysctl_kprobes_optimization, 1539 .maxlen = sizeof(int), 1540 .mode = 0644, 1541 .proc_handler = proc_kprobes_optimization_handler, 1542 .extra1 = &zero, 1543 .extra2 = &one, 1544 }, 1545 #endif 1546 { } 1547 }; 1548 1549 static struct ctl_table dev_table[] = { 1550 { } 1551 }; 1552 1553 static DEFINE_SPINLOCK(sysctl_lock); 1554 1555 /* called under sysctl_lock */ 1556 static int use_table(struct ctl_table_header *p) 1557 { 1558 if (unlikely(p->unregistering)) 1559 return 0; 1560 p->used++; 1561 return 1; 1562 } 1563 1564 /* called under sysctl_lock */ 1565 static void unuse_table(struct ctl_table_header *p) 1566 { 1567 if (!--p->used) 1568 if (unlikely(p->unregistering)) 1569 complete(p->unregistering); 1570 } 1571 1572 /* called under sysctl_lock, will reacquire if has to wait */ 1573 static void start_unregistering(struct ctl_table_header *p) 1574 { 1575 /* 1576 * if p->used is 0, nobody will ever touch that entry again; 1577 * we'll eliminate all paths to it before dropping sysctl_lock 1578 */ 1579 if (unlikely(p->used)) { 1580 struct completion wait; 1581 init_completion(&wait); 1582 p->unregistering = &wait; 1583 spin_unlock(&sysctl_lock); 1584 wait_for_completion(&wait); 1585 spin_lock(&sysctl_lock); 1586 } else { 1587 /* anything non-NULL; we'll never dereference it */ 1588 p->unregistering = ERR_PTR(-EINVAL); 1589 } 1590 /* 1591 * do not remove from the list until nobody holds it; walking the 1592 * list in do_sysctl() relies on that. 1593 */ 1594 list_del_init(&p->ctl_entry); 1595 } 1596 1597 void sysctl_head_get(struct ctl_table_header *head) 1598 { 1599 spin_lock(&sysctl_lock); 1600 head->count++; 1601 spin_unlock(&sysctl_lock); 1602 } 1603 1604 void sysctl_head_put(struct ctl_table_header *head) 1605 { 1606 spin_lock(&sysctl_lock); 1607 if (!--head->count) 1608 kfree_rcu(head, rcu); 1609 spin_unlock(&sysctl_lock); 1610 } 1611 1612 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1613 { 1614 if (!head) 1615 BUG(); 1616 spin_lock(&sysctl_lock); 1617 if (!use_table(head)) 1618 head = ERR_PTR(-ENOENT); 1619 spin_unlock(&sysctl_lock); 1620 return head; 1621 } 1622 1623 void sysctl_head_finish(struct ctl_table_header *head) 1624 { 1625 if (!head) 1626 return; 1627 spin_lock(&sysctl_lock); 1628 unuse_table(head); 1629 spin_unlock(&sysctl_lock); 1630 } 1631 1632 static struct ctl_table_set * 1633 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1634 { 1635 struct ctl_table_set *set = &root->default_set; 1636 if (root->lookup) 1637 set = root->lookup(root, namespaces); 1638 return set; 1639 } 1640 1641 static struct list_head * 1642 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1643 { 1644 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1645 return &set->list; 1646 } 1647 1648 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1649 struct ctl_table_header *prev) 1650 { 1651 struct ctl_table_root *root; 1652 struct list_head *header_list; 1653 struct ctl_table_header *head; 1654 struct list_head *tmp; 1655 1656 spin_lock(&sysctl_lock); 1657 if (prev) { 1658 head = prev; 1659 tmp = &prev->ctl_entry; 1660 unuse_table(prev); 1661 goto next; 1662 } 1663 tmp = &root_table_header.ctl_entry; 1664 for (;;) { 1665 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1666 1667 if (!use_table(head)) 1668 goto next; 1669 spin_unlock(&sysctl_lock); 1670 return head; 1671 next: 1672 root = head->root; 1673 tmp = tmp->next; 1674 header_list = lookup_header_list(root, namespaces); 1675 if (tmp != header_list) 1676 continue; 1677 1678 do { 1679 root = list_entry(root->root_list.next, 1680 struct ctl_table_root, root_list); 1681 if (root == &sysctl_table_root) 1682 goto out; 1683 header_list = lookup_header_list(root, namespaces); 1684 } while (list_empty(header_list)); 1685 tmp = header_list->next; 1686 } 1687 out: 1688 spin_unlock(&sysctl_lock); 1689 return NULL; 1690 } 1691 1692 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1693 { 1694 return __sysctl_head_next(current->nsproxy, prev); 1695 } 1696 1697 void register_sysctl_root(struct ctl_table_root *root) 1698 { 1699 spin_lock(&sysctl_lock); 1700 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1701 spin_unlock(&sysctl_lock); 1702 } 1703 1704 /* 1705 * sysctl_perm does NOT grant the superuser all rights automatically, because 1706 * some sysctl variables are readonly even to root. 1707 */ 1708 1709 static int test_perm(int mode, int op) 1710 { 1711 if (!current_euid()) 1712 mode >>= 6; 1713 else if (in_egroup_p(0)) 1714 mode >>= 3; 1715 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1716 return 0; 1717 return -EACCES; 1718 } 1719 1720 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1721 { 1722 int mode; 1723 1724 if (root->permissions) 1725 mode = root->permissions(root, current->nsproxy, table); 1726 else 1727 mode = table->mode; 1728 1729 return test_perm(mode, op); 1730 } 1731 1732 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1733 { 1734 for (; table->procname; table++) { 1735 table->parent = parent; 1736 if (table->child) 1737 sysctl_set_parent(table, table->child); 1738 } 1739 } 1740 1741 static __init int sysctl_init(void) 1742 { 1743 sysctl_set_parent(NULL, root_table); 1744 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1745 sysctl_check_table(current->nsproxy, root_table); 1746 #endif 1747 return 0; 1748 } 1749 1750 core_initcall(sysctl_init); 1751 1752 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1753 struct ctl_table *table) 1754 { 1755 struct ctl_table *p; 1756 const char *s = branch->procname; 1757 1758 /* branch should have named subdirectory as its first element */ 1759 if (!s || !branch->child) 1760 return NULL; 1761 1762 /* ... and nothing else */ 1763 if (branch[1].procname) 1764 return NULL; 1765 1766 /* table should contain subdirectory with the same name */ 1767 for (p = table; p->procname; p++) { 1768 if (!p->child) 1769 continue; 1770 if (p->procname && strcmp(p->procname, s) == 0) 1771 return p; 1772 } 1773 return NULL; 1774 } 1775 1776 /* see if attaching q to p would be an improvement */ 1777 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1778 { 1779 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1780 struct ctl_table *next; 1781 int is_better = 0; 1782 int not_in_parent = !p->attached_by; 1783 1784 while ((next = is_branch_in(by, to)) != NULL) { 1785 if (by == q->attached_by) 1786 is_better = 1; 1787 if (to == p->attached_by) 1788 not_in_parent = 1; 1789 by = by->child; 1790 to = next->child; 1791 } 1792 1793 if (is_better && not_in_parent) { 1794 q->attached_by = by; 1795 q->attached_to = to; 1796 q->parent = p; 1797 } 1798 } 1799 1800 /** 1801 * __register_sysctl_paths - register a sysctl hierarchy 1802 * @root: List of sysctl headers to register on 1803 * @namespaces: Data to compute which lists of sysctl entries are visible 1804 * @path: The path to the directory the sysctl table is in. 1805 * @table: the top-level table structure 1806 * 1807 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1808 * array. A completely 0 filled entry terminates the table. 1809 * 1810 * The members of the &struct ctl_table structure are used as follows: 1811 * 1812 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1813 * enter a sysctl file 1814 * 1815 * data - a pointer to data for use by proc_handler 1816 * 1817 * maxlen - the maximum size in bytes of the data 1818 * 1819 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1820 * 1821 * child - a pointer to the child sysctl table if this entry is a directory, or 1822 * %NULL. 1823 * 1824 * proc_handler - the text handler routine (described below) 1825 * 1826 * de - for internal use by the sysctl routines 1827 * 1828 * extra1, extra2 - extra pointers usable by the proc handler routines 1829 * 1830 * Leaf nodes in the sysctl tree will be represented by a single file 1831 * under /proc; non-leaf nodes will be represented by directories. 1832 * 1833 * sysctl(2) can automatically manage read and write requests through 1834 * the sysctl table. The data and maxlen fields of the ctl_table 1835 * struct enable minimal validation of the values being written to be 1836 * performed, and the mode field allows minimal authentication. 1837 * 1838 * There must be a proc_handler routine for any terminal nodes 1839 * mirrored under /proc/sys (non-terminals are handled by a built-in 1840 * directory handler). Several default handlers are available to 1841 * cover common cases - 1842 * 1843 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1844 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1845 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1846 * 1847 * It is the handler's job to read the input buffer from user memory 1848 * and process it. The handler should return 0 on success. 1849 * 1850 * This routine returns %NULL on a failure to register, and a pointer 1851 * to the table header on success. 1852 */ 1853 struct ctl_table_header *__register_sysctl_paths( 1854 struct ctl_table_root *root, 1855 struct nsproxy *namespaces, 1856 const struct ctl_path *path, struct ctl_table *table) 1857 { 1858 struct ctl_table_header *header; 1859 struct ctl_table *new, **prevp; 1860 unsigned int n, npath; 1861 struct ctl_table_set *set; 1862 1863 /* Count the path components */ 1864 for (npath = 0; path[npath].procname; ++npath) 1865 ; 1866 1867 /* 1868 * For each path component, allocate a 2-element ctl_table array. 1869 * The first array element will be filled with the sysctl entry 1870 * for this, the second will be the sentinel (procname == 0). 1871 * 1872 * We allocate everything in one go so that we don't have to 1873 * worry about freeing additional memory in unregister_sysctl_table. 1874 */ 1875 header = kzalloc(sizeof(struct ctl_table_header) + 1876 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1877 if (!header) 1878 return NULL; 1879 1880 new = (struct ctl_table *) (header + 1); 1881 1882 /* Now connect the dots */ 1883 prevp = &header->ctl_table; 1884 for (n = 0; n < npath; ++n, ++path) { 1885 /* Copy the procname */ 1886 new->procname = path->procname; 1887 new->mode = 0555; 1888 1889 *prevp = new; 1890 prevp = &new->child; 1891 1892 new += 2; 1893 } 1894 *prevp = table; 1895 header->ctl_table_arg = table; 1896 1897 INIT_LIST_HEAD(&header->ctl_entry); 1898 header->used = 0; 1899 header->unregistering = NULL; 1900 header->root = root; 1901 sysctl_set_parent(NULL, header->ctl_table); 1902 header->count = 1; 1903 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1904 if (sysctl_check_table(namespaces, header->ctl_table)) { 1905 kfree(header); 1906 return NULL; 1907 } 1908 #endif 1909 spin_lock(&sysctl_lock); 1910 header->set = lookup_header_set(root, namespaces); 1911 header->attached_by = header->ctl_table; 1912 header->attached_to = root_table; 1913 header->parent = &root_table_header; 1914 for (set = header->set; set; set = set->parent) { 1915 struct ctl_table_header *p; 1916 list_for_each_entry(p, &set->list, ctl_entry) { 1917 if (p->unregistering) 1918 continue; 1919 try_attach(p, header); 1920 } 1921 } 1922 header->parent->count++; 1923 list_add_tail(&header->ctl_entry, &header->set->list); 1924 spin_unlock(&sysctl_lock); 1925 1926 return header; 1927 } 1928 1929 /** 1930 * register_sysctl_table_path - register a sysctl table hierarchy 1931 * @path: The path to the directory the sysctl table is in. 1932 * @table: the top-level table structure 1933 * 1934 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1935 * array. A completely 0 filled entry terminates the table. 1936 * 1937 * See __register_sysctl_paths for more details. 1938 */ 1939 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1940 struct ctl_table *table) 1941 { 1942 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1943 path, table); 1944 } 1945 1946 /** 1947 * register_sysctl_table - register a sysctl table hierarchy 1948 * @table: the top-level table structure 1949 * 1950 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1951 * array. A completely 0 filled entry terminates the table. 1952 * 1953 * See register_sysctl_paths for more details. 1954 */ 1955 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1956 { 1957 static const struct ctl_path null_path[] = { {} }; 1958 1959 return register_sysctl_paths(null_path, table); 1960 } 1961 1962 /** 1963 * unregister_sysctl_table - unregister a sysctl table hierarchy 1964 * @header: the header returned from register_sysctl_table 1965 * 1966 * Unregisters the sysctl table and all children. proc entries may not 1967 * actually be removed until they are no longer used by anyone. 1968 */ 1969 void unregister_sysctl_table(struct ctl_table_header * header) 1970 { 1971 might_sleep(); 1972 1973 if (header == NULL) 1974 return; 1975 1976 spin_lock(&sysctl_lock); 1977 start_unregistering(header); 1978 if (!--header->parent->count) { 1979 WARN_ON(1); 1980 kfree_rcu(header->parent, rcu); 1981 } 1982 if (!--header->count) 1983 kfree_rcu(header, rcu); 1984 spin_unlock(&sysctl_lock); 1985 } 1986 1987 int sysctl_is_seen(struct ctl_table_header *p) 1988 { 1989 struct ctl_table_set *set = p->set; 1990 int res; 1991 spin_lock(&sysctl_lock); 1992 if (p->unregistering) 1993 res = 0; 1994 else if (!set->is_seen) 1995 res = 1; 1996 else 1997 res = set->is_seen(set); 1998 spin_unlock(&sysctl_lock); 1999 return res; 2000 } 2001 2002 void setup_sysctl_set(struct ctl_table_set *p, 2003 struct ctl_table_set *parent, 2004 int (*is_seen)(struct ctl_table_set *)) 2005 { 2006 INIT_LIST_HEAD(&p->list); 2007 p->parent = parent ? parent : &sysctl_table_root.default_set; 2008 p->is_seen = is_seen; 2009 } 2010 2011 #else /* !CONFIG_SYSCTL */ 2012 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2013 { 2014 return NULL; 2015 } 2016 2017 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2018 struct ctl_table *table) 2019 { 2020 return NULL; 2021 } 2022 2023 void unregister_sysctl_table(struct ctl_table_header * table) 2024 { 2025 } 2026 2027 void setup_sysctl_set(struct ctl_table_set *p, 2028 struct ctl_table_set *parent, 2029 int (*is_seen)(struct ctl_table_set *)) 2030 { 2031 } 2032 2033 void sysctl_head_put(struct ctl_table_header *head) 2034 { 2035 } 2036 2037 #endif /* CONFIG_SYSCTL */ 2038 2039 /* 2040 * /proc/sys support 2041 */ 2042 2043 #ifdef CONFIG_PROC_SYSCTL 2044 2045 static int _proc_do_string(void* data, int maxlen, int write, 2046 void __user *buffer, 2047 size_t *lenp, loff_t *ppos) 2048 { 2049 size_t len; 2050 char __user *p; 2051 char c; 2052 2053 if (!data || !maxlen || !*lenp) { 2054 *lenp = 0; 2055 return 0; 2056 } 2057 2058 if (write) { 2059 len = 0; 2060 p = buffer; 2061 while (len < *lenp) { 2062 if (get_user(c, p++)) 2063 return -EFAULT; 2064 if (c == 0 || c == '\n') 2065 break; 2066 len++; 2067 } 2068 if (len >= maxlen) 2069 len = maxlen-1; 2070 if(copy_from_user(data, buffer, len)) 2071 return -EFAULT; 2072 ((char *) data)[len] = 0; 2073 *ppos += *lenp; 2074 } else { 2075 len = strlen(data); 2076 if (len > maxlen) 2077 len = maxlen; 2078 2079 if (*ppos > len) { 2080 *lenp = 0; 2081 return 0; 2082 } 2083 2084 data += *ppos; 2085 len -= *ppos; 2086 2087 if (len > *lenp) 2088 len = *lenp; 2089 if (len) 2090 if(copy_to_user(buffer, data, len)) 2091 return -EFAULT; 2092 if (len < *lenp) { 2093 if(put_user('\n', ((char __user *) buffer) + len)) 2094 return -EFAULT; 2095 len++; 2096 } 2097 *lenp = len; 2098 *ppos += len; 2099 } 2100 return 0; 2101 } 2102 2103 /** 2104 * proc_dostring - read a string sysctl 2105 * @table: the sysctl table 2106 * @write: %TRUE if this is a write to the sysctl file 2107 * @buffer: the user buffer 2108 * @lenp: the size of the user buffer 2109 * @ppos: file position 2110 * 2111 * Reads/writes a string from/to the user buffer. If the kernel 2112 * buffer provided is not large enough to hold the string, the 2113 * string is truncated. The copied string is %NULL-terminated. 2114 * If the string is being read by the user process, it is copied 2115 * and a newline '\n' is added. It is truncated if the buffer is 2116 * not large enough. 2117 * 2118 * Returns 0 on success. 2119 */ 2120 int proc_dostring(struct ctl_table *table, int write, 2121 void __user *buffer, size_t *lenp, loff_t *ppos) 2122 { 2123 return _proc_do_string(table->data, table->maxlen, write, 2124 buffer, lenp, ppos); 2125 } 2126 2127 static size_t proc_skip_spaces(char **buf) 2128 { 2129 size_t ret; 2130 char *tmp = skip_spaces(*buf); 2131 ret = tmp - *buf; 2132 *buf = tmp; 2133 return ret; 2134 } 2135 2136 static void proc_skip_char(char **buf, size_t *size, const char v) 2137 { 2138 while (*size) { 2139 if (**buf != v) 2140 break; 2141 (*size)--; 2142 (*buf)++; 2143 } 2144 } 2145 2146 #define TMPBUFLEN 22 2147 /** 2148 * proc_get_long - reads an ASCII formatted integer from a user buffer 2149 * 2150 * @buf: a kernel buffer 2151 * @size: size of the kernel buffer 2152 * @val: this is where the number will be stored 2153 * @neg: set to %TRUE if number is negative 2154 * @perm_tr: a vector which contains the allowed trailers 2155 * @perm_tr_len: size of the perm_tr vector 2156 * @tr: pointer to store the trailer character 2157 * 2158 * In case of success %0 is returned and @buf and @size are updated with 2159 * the amount of bytes read. If @tr is non-NULL and a trailing 2160 * character exists (size is non-zero after returning from this 2161 * function), @tr is updated with the trailing character. 2162 */ 2163 static int proc_get_long(char **buf, size_t *size, 2164 unsigned long *val, bool *neg, 2165 const char *perm_tr, unsigned perm_tr_len, char *tr) 2166 { 2167 int len; 2168 char *p, tmp[TMPBUFLEN]; 2169 2170 if (!*size) 2171 return -EINVAL; 2172 2173 len = *size; 2174 if (len > TMPBUFLEN - 1) 2175 len = TMPBUFLEN - 1; 2176 2177 memcpy(tmp, *buf, len); 2178 2179 tmp[len] = 0; 2180 p = tmp; 2181 if (*p == '-' && *size > 1) { 2182 *neg = true; 2183 p++; 2184 } else 2185 *neg = false; 2186 if (!isdigit(*p)) 2187 return -EINVAL; 2188 2189 *val = simple_strtoul(p, &p, 0); 2190 2191 len = p - tmp; 2192 2193 /* We don't know if the next char is whitespace thus we may accept 2194 * invalid integers (e.g. 1234...a) or two integers instead of one 2195 * (e.g. 123...1). So lets not allow such large numbers. */ 2196 if (len == TMPBUFLEN - 1) 2197 return -EINVAL; 2198 2199 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2200 return -EINVAL; 2201 2202 if (tr && (len < *size)) 2203 *tr = *p; 2204 2205 *buf += len; 2206 *size -= len; 2207 2208 return 0; 2209 } 2210 2211 /** 2212 * proc_put_long - converts an integer to a decimal ASCII formatted string 2213 * 2214 * @buf: the user buffer 2215 * @size: the size of the user buffer 2216 * @val: the integer to be converted 2217 * @neg: sign of the number, %TRUE for negative 2218 * 2219 * In case of success %0 is returned and @buf and @size are updated with 2220 * the amount of bytes written. 2221 */ 2222 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2223 bool neg) 2224 { 2225 int len; 2226 char tmp[TMPBUFLEN], *p = tmp; 2227 2228 sprintf(p, "%s%lu", neg ? "-" : "", val); 2229 len = strlen(tmp); 2230 if (len > *size) 2231 len = *size; 2232 if (copy_to_user(*buf, tmp, len)) 2233 return -EFAULT; 2234 *size -= len; 2235 *buf += len; 2236 return 0; 2237 } 2238 #undef TMPBUFLEN 2239 2240 static int proc_put_char(void __user **buf, size_t *size, char c) 2241 { 2242 if (*size) { 2243 char __user **buffer = (char __user **)buf; 2244 if (put_user(c, *buffer)) 2245 return -EFAULT; 2246 (*size)--, (*buffer)++; 2247 *buf = *buffer; 2248 } 2249 return 0; 2250 } 2251 2252 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2253 int *valp, 2254 int write, void *data) 2255 { 2256 if (write) { 2257 *valp = *negp ? -*lvalp : *lvalp; 2258 } else { 2259 int val = *valp; 2260 if (val < 0) { 2261 *negp = true; 2262 *lvalp = (unsigned long)-val; 2263 } else { 2264 *negp = false; 2265 *lvalp = (unsigned long)val; 2266 } 2267 } 2268 return 0; 2269 } 2270 2271 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2272 2273 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2274 int write, void __user *buffer, 2275 size_t *lenp, loff_t *ppos, 2276 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2277 int write, void *data), 2278 void *data) 2279 { 2280 int *i, vleft, first = 1, err = 0; 2281 unsigned long page = 0; 2282 size_t left; 2283 char *kbuf; 2284 2285 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2286 *lenp = 0; 2287 return 0; 2288 } 2289 2290 i = (int *) tbl_data; 2291 vleft = table->maxlen / sizeof(*i); 2292 left = *lenp; 2293 2294 if (!conv) 2295 conv = do_proc_dointvec_conv; 2296 2297 if (write) { 2298 if (left > PAGE_SIZE - 1) 2299 left = PAGE_SIZE - 1; 2300 page = __get_free_page(GFP_TEMPORARY); 2301 kbuf = (char *) page; 2302 if (!kbuf) 2303 return -ENOMEM; 2304 if (copy_from_user(kbuf, buffer, left)) { 2305 err = -EFAULT; 2306 goto free; 2307 } 2308 kbuf[left] = 0; 2309 } 2310 2311 for (; left && vleft--; i++, first=0) { 2312 unsigned long lval; 2313 bool neg; 2314 2315 if (write) { 2316 left -= proc_skip_spaces(&kbuf); 2317 2318 if (!left) 2319 break; 2320 err = proc_get_long(&kbuf, &left, &lval, &neg, 2321 proc_wspace_sep, 2322 sizeof(proc_wspace_sep), NULL); 2323 if (err) 2324 break; 2325 if (conv(&neg, &lval, i, 1, data)) { 2326 err = -EINVAL; 2327 break; 2328 } 2329 } else { 2330 if (conv(&neg, &lval, i, 0, data)) { 2331 err = -EINVAL; 2332 break; 2333 } 2334 if (!first) 2335 err = proc_put_char(&buffer, &left, '\t'); 2336 if (err) 2337 break; 2338 err = proc_put_long(&buffer, &left, lval, neg); 2339 if (err) 2340 break; 2341 } 2342 } 2343 2344 if (!write && !first && left && !err) 2345 err = proc_put_char(&buffer, &left, '\n'); 2346 if (write && !err && left) 2347 left -= proc_skip_spaces(&kbuf); 2348 free: 2349 if (write) { 2350 free_page(page); 2351 if (first) 2352 return err ? : -EINVAL; 2353 } 2354 *lenp -= left; 2355 *ppos += *lenp; 2356 return err; 2357 } 2358 2359 static int do_proc_dointvec(struct ctl_table *table, int write, 2360 void __user *buffer, size_t *lenp, loff_t *ppos, 2361 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2362 int write, void *data), 2363 void *data) 2364 { 2365 return __do_proc_dointvec(table->data, table, write, 2366 buffer, lenp, ppos, conv, data); 2367 } 2368 2369 /** 2370 * proc_dointvec - read a vector of integers 2371 * @table: the sysctl table 2372 * @write: %TRUE if this is a write to the sysctl file 2373 * @buffer: the user buffer 2374 * @lenp: the size of the user buffer 2375 * @ppos: file position 2376 * 2377 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2378 * values from/to the user buffer, treated as an ASCII string. 2379 * 2380 * Returns 0 on success. 2381 */ 2382 int proc_dointvec(struct ctl_table *table, int write, 2383 void __user *buffer, size_t *lenp, loff_t *ppos) 2384 { 2385 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2386 NULL,NULL); 2387 } 2388 2389 /* 2390 * Taint values can only be increased 2391 * This means we can safely use a temporary. 2392 */ 2393 static int proc_taint(struct ctl_table *table, int write, 2394 void __user *buffer, size_t *lenp, loff_t *ppos) 2395 { 2396 struct ctl_table t; 2397 unsigned long tmptaint = get_taint(); 2398 int err; 2399 2400 if (write && !capable(CAP_SYS_ADMIN)) 2401 return -EPERM; 2402 2403 t = *table; 2404 t.data = &tmptaint; 2405 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2406 if (err < 0) 2407 return err; 2408 2409 if (write) { 2410 /* 2411 * Poor man's atomic or. Not worth adding a primitive 2412 * to everyone's atomic.h for this 2413 */ 2414 int i; 2415 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2416 if ((tmptaint >> i) & 1) 2417 add_taint(i); 2418 } 2419 } 2420 2421 return err; 2422 } 2423 2424 #ifdef CONFIG_PRINTK 2425 static int proc_dmesg_restrict(struct ctl_table *table, int write, 2426 void __user *buffer, size_t *lenp, loff_t *ppos) 2427 { 2428 if (write && !capable(CAP_SYS_ADMIN)) 2429 return -EPERM; 2430 2431 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2432 } 2433 #endif 2434 2435 struct do_proc_dointvec_minmax_conv_param { 2436 int *min; 2437 int *max; 2438 }; 2439 2440 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2441 int *valp, 2442 int write, void *data) 2443 { 2444 struct do_proc_dointvec_minmax_conv_param *param = data; 2445 if (write) { 2446 int val = *negp ? -*lvalp : *lvalp; 2447 if ((param->min && *param->min > val) || 2448 (param->max && *param->max < val)) 2449 return -EINVAL; 2450 *valp = val; 2451 } else { 2452 int val = *valp; 2453 if (val < 0) { 2454 *negp = true; 2455 *lvalp = (unsigned long)-val; 2456 } else { 2457 *negp = false; 2458 *lvalp = (unsigned long)val; 2459 } 2460 } 2461 return 0; 2462 } 2463 2464 /** 2465 * proc_dointvec_minmax - read a vector of integers with min/max values 2466 * @table: the sysctl table 2467 * @write: %TRUE if this is a write to the sysctl file 2468 * @buffer: the user buffer 2469 * @lenp: the size of the user buffer 2470 * @ppos: file position 2471 * 2472 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2473 * values from/to the user buffer, treated as an ASCII string. 2474 * 2475 * This routine will ensure the values are within the range specified by 2476 * table->extra1 (min) and table->extra2 (max). 2477 * 2478 * Returns 0 on success. 2479 */ 2480 int proc_dointvec_minmax(struct ctl_table *table, int write, 2481 void __user *buffer, size_t *lenp, loff_t *ppos) 2482 { 2483 struct do_proc_dointvec_minmax_conv_param param = { 2484 .min = (int *) table->extra1, 2485 .max = (int *) table->extra2, 2486 }; 2487 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2488 do_proc_dointvec_minmax_conv, ¶m); 2489 } 2490 2491 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2492 void __user *buffer, 2493 size_t *lenp, loff_t *ppos, 2494 unsigned long convmul, 2495 unsigned long convdiv) 2496 { 2497 unsigned long *i, *min, *max; 2498 int vleft, first = 1, err = 0; 2499 unsigned long page = 0; 2500 size_t left; 2501 char *kbuf; 2502 2503 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2504 *lenp = 0; 2505 return 0; 2506 } 2507 2508 i = (unsigned long *) data; 2509 min = (unsigned long *) table->extra1; 2510 max = (unsigned long *) table->extra2; 2511 vleft = table->maxlen / sizeof(unsigned long); 2512 left = *lenp; 2513 2514 if (write) { 2515 if (left > PAGE_SIZE - 1) 2516 left = PAGE_SIZE - 1; 2517 page = __get_free_page(GFP_TEMPORARY); 2518 kbuf = (char *) page; 2519 if (!kbuf) 2520 return -ENOMEM; 2521 if (copy_from_user(kbuf, buffer, left)) { 2522 err = -EFAULT; 2523 goto free; 2524 } 2525 kbuf[left] = 0; 2526 } 2527 2528 for (; left && vleft--; i++, first = 0) { 2529 unsigned long val; 2530 2531 if (write) { 2532 bool neg; 2533 2534 left -= proc_skip_spaces(&kbuf); 2535 2536 err = proc_get_long(&kbuf, &left, &val, &neg, 2537 proc_wspace_sep, 2538 sizeof(proc_wspace_sep), NULL); 2539 if (err) 2540 break; 2541 if (neg) 2542 continue; 2543 if ((min && val < *min) || (max && val > *max)) 2544 continue; 2545 *i = val; 2546 } else { 2547 val = convdiv * (*i) / convmul; 2548 if (!first) 2549 err = proc_put_char(&buffer, &left, '\t'); 2550 err = proc_put_long(&buffer, &left, val, false); 2551 if (err) 2552 break; 2553 } 2554 } 2555 2556 if (!write && !first && left && !err) 2557 err = proc_put_char(&buffer, &left, '\n'); 2558 if (write && !err) 2559 left -= proc_skip_spaces(&kbuf); 2560 free: 2561 if (write) { 2562 free_page(page); 2563 if (first) 2564 return err ? : -EINVAL; 2565 } 2566 *lenp -= left; 2567 *ppos += *lenp; 2568 return err; 2569 } 2570 2571 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2572 void __user *buffer, 2573 size_t *lenp, loff_t *ppos, 2574 unsigned long convmul, 2575 unsigned long convdiv) 2576 { 2577 return __do_proc_doulongvec_minmax(table->data, table, write, 2578 buffer, lenp, ppos, convmul, convdiv); 2579 } 2580 2581 /** 2582 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2583 * @table: the sysctl table 2584 * @write: %TRUE if this is a write to the sysctl file 2585 * @buffer: the user buffer 2586 * @lenp: the size of the user buffer 2587 * @ppos: file position 2588 * 2589 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2590 * values from/to the user buffer, treated as an ASCII string. 2591 * 2592 * This routine will ensure the values are within the range specified by 2593 * table->extra1 (min) and table->extra2 (max). 2594 * 2595 * Returns 0 on success. 2596 */ 2597 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2598 void __user *buffer, size_t *lenp, loff_t *ppos) 2599 { 2600 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2601 } 2602 2603 /** 2604 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2605 * @table: the sysctl table 2606 * @write: %TRUE if this is a write to the sysctl file 2607 * @buffer: the user buffer 2608 * @lenp: the size of the user buffer 2609 * @ppos: file position 2610 * 2611 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2612 * values from/to the user buffer, treated as an ASCII string. The values 2613 * are treated as milliseconds, and converted to jiffies when they are stored. 2614 * 2615 * This routine will ensure the values are within the range specified by 2616 * table->extra1 (min) and table->extra2 (max). 2617 * 2618 * Returns 0 on success. 2619 */ 2620 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2621 void __user *buffer, 2622 size_t *lenp, loff_t *ppos) 2623 { 2624 return do_proc_doulongvec_minmax(table, write, buffer, 2625 lenp, ppos, HZ, 1000l); 2626 } 2627 2628 2629 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2630 int *valp, 2631 int write, void *data) 2632 { 2633 if (write) { 2634 if (*lvalp > LONG_MAX / HZ) 2635 return 1; 2636 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2637 } else { 2638 int val = *valp; 2639 unsigned long lval; 2640 if (val < 0) { 2641 *negp = true; 2642 lval = (unsigned long)-val; 2643 } else { 2644 *negp = false; 2645 lval = (unsigned long)val; 2646 } 2647 *lvalp = lval / HZ; 2648 } 2649 return 0; 2650 } 2651 2652 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2653 int *valp, 2654 int write, void *data) 2655 { 2656 if (write) { 2657 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2658 return 1; 2659 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2660 } else { 2661 int val = *valp; 2662 unsigned long lval; 2663 if (val < 0) { 2664 *negp = true; 2665 lval = (unsigned long)-val; 2666 } else { 2667 *negp = false; 2668 lval = (unsigned long)val; 2669 } 2670 *lvalp = jiffies_to_clock_t(lval); 2671 } 2672 return 0; 2673 } 2674 2675 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2676 int *valp, 2677 int write, void *data) 2678 { 2679 if (write) { 2680 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2681 } else { 2682 int val = *valp; 2683 unsigned long lval; 2684 if (val < 0) { 2685 *negp = true; 2686 lval = (unsigned long)-val; 2687 } else { 2688 *negp = false; 2689 lval = (unsigned long)val; 2690 } 2691 *lvalp = jiffies_to_msecs(lval); 2692 } 2693 return 0; 2694 } 2695 2696 /** 2697 * proc_dointvec_jiffies - read a vector of integers as seconds 2698 * @table: the sysctl table 2699 * @write: %TRUE if this is a write to the sysctl file 2700 * @buffer: the user buffer 2701 * @lenp: the size of the user buffer 2702 * @ppos: file position 2703 * 2704 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2705 * values from/to the user buffer, treated as an ASCII string. 2706 * The values read are assumed to be in seconds, and are converted into 2707 * jiffies. 2708 * 2709 * Returns 0 on success. 2710 */ 2711 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2712 void __user *buffer, size_t *lenp, loff_t *ppos) 2713 { 2714 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2715 do_proc_dointvec_jiffies_conv,NULL); 2716 } 2717 2718 /** 2719 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2720 * @table: the sysctl table 2721 * @write: %TRUE if this is a write to the sysctl file 2722 * @buffer: the user buffer 2723 * @lenp: the size of the user buffer 2724 * @ppos: pointer to the file position 2725 * 2726 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2727 * values from/to the user buffer, treated as an ASCII string. 2728 * The values read are assumed to be in 1/USER_HZ seconds, and 2729 * are converted into jiffies. 2730 * 2731 * Returns 0 on success. 2732 */ 2733 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2734 void __user *buffer, size_t *lenp, loff_t *ppos) 2735 { 2736 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2737 do_proc_dointvec_userhz_jiffies_conv,NULL); 2738 } 2739 2740 /** 2741 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2742 * @table: the sysctl table 2743 * @write: %TRUE if this is a write to the sysctl file 2744 * @buffer: the user buffer 2745 * @lenp: the size of the user buffer 2746 * @ppos: file position 2747 * @ppos: the current position in the file 2748 * 2749 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2750 * values from/to the user buffer, treated as an ASCII string. 2751 * The values read are assumed to be in 1/1000 seconds, and 2752 * are converted into jiffies. 2753 * 2754 * Returns 0 on success. 2755 */ 2756 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2757 void __user *buffer, size_t *lenp, loff_t *ppos) 2758 { 2759 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2760 do_proc_dointvec_ms_jiffies_conv, NULL); 2761 } 2762 2763 static int proc_do_cad_pid(struct ctl_table *table, int write, 2764 void __user *buffer, size_t *lenp, loff_t *ppos) 2765 { 2766 struct pid *new_pid; 2767 pid_t tmp; 2768 int r; 2769 2770 tmp = pid_vnr(cad_pid); 2771 2772 r = __do_proc_dointvec(&tmp, table, write, buffer, 2773 lenp, ppos, NULL, NULL); 2774 if (r || !write) 2775 return r; 2776 2777 new_pid = find_get_pid(tmp); 2778 if (!new_pid) 2779 return -ESRCH; 2780 2781 put_pid(xchg(&cad_pid, new_pid)); 2782 return 0; 2783 } 2784 2785 /** 2786 * proc_do_large_bitmap - read/write from/to a large bitmap 2787 * @table: the sysctl table 2788 * @write: %TRUE if this is a write to the sysctl file 2789 * @buffer: the user buffer 2790 * @lenp: the size of the user buffer 2791 * @ppos: file position 2792 * 2793 * The bitmap is stored at table->data and the bitmap length (in bits) 2794 * in table->maxlen. 2795 * 2796 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2797 * large bitmaps may be represented in a compact manner. Writing into 2798 * the file will clear the bitmap then update it with the given input. 2799 * 2800 * Returns 0 on success. 2801 */ 2802 int proc_do_large_bitmap(struct ctl_table *table, int write, 2803 void __user *buffer, size_t *lenp, loff_t *ppos) 2804 { 2805 int err = 0; 2806 bool first = 1; 2807 size_t left = *lenp; 2808 unsigned long bitmap_len = table->maxlen; 2809 unsigned long *bitmap = (unsigned long *) table->data; 2810 unsigned long *tmp_bitmap = NULL; 2811 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2812 2813 if (!bitmap_len || !left || (*ppos && !write)) { 2814 *lenp = 0; 2815 return 0; 2816 } 2817 2818 if (write) { 2819 unsigned long page = 0; 2820 char *kbuf; 2821 2822 if (left > PAGE_SIZE - 1) 2823 left = PAGE_SIZE - 1; 2824 2825 page = __get_free_page(GFP_TEMPORARY); 2826 kbuf = (char *) page; 2827 if (!kbuf) 2828 return -ENOMEM; 2829 if (copy_from_user(kbuf, buffer, left)) { 2830 free_page(page); 2831 return -EFAULT; 2832 } 2833 kbuf[left] = 0; 2834 2835 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2836 GFP_KERNEL); 2837 if (!tmp_bitmap) { 2838 free_page(page); 2839 return -ENOMEM; 2840 } 2841 proc_skip_char(&kbuf, &left, '\n'); 2842 while (!err && left) { 2843 unsigned long val_a, val_b; 2844 bool neg; 2845 2846 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2847 sizeof(tr_a), &c); 2848 if (err) 2849 break; 2850 if (val_a >= bitmap_len || neg) { 2851 err = -EINVAL; 2852 break; 2853 } 2854 2855 val_b = val_a; 2856 if (left) { 2857 kbuf++; 2858 left--; 2859 } 2860 2861 if (c == '-') { 2862 err = proc_get_long(&kbuf, &left, &val_b, 2863 &neg, tr_b, sizeof(tr_b), 2864 &c); 2865 if (err) 2866 break; 2867 if (val_b >= bitmap_len || neg || 2868 val_a > val_b) { 2869 err = -EINVAL; 2870 break; 2871 } 2872 if (left) { 2873 kbuf++; 2874 left--; 2875 } 2876 } 2877 2878 while (val_a <= val_b) 2879 set_bit(val_a++, tmp_bitmap); 2880 2881 first = 0; 2882 proc_skip_char(&kbuf, &left, '\n'); 2883 } 2884 free_page(page); 2885 } else { 2886 unsigned long bit_a, bit_b = 0; 2887 2888 while (left) { 2889 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2890 if (bit_a >= bitmap_len) 2891 break; 2892 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2893 bit_a + 1) - 1; 2894 2895 if (!first) { 2896 err = proc_put_char(&buffer, &left, ','); 2897 if (err) 2898 break; 2899 } 2900 err = proc_put_long(&buffer, &left, bit_a, false); 2901 if (err) 2902 break; 2903 if (bit_a != bit_b) { 2904 err = proc_put_char(&buffer, &left, '-'); 2905 if (err) 2906 break; 2907 err = proc_put_long(&buffer, &left, bit_b, false); 2908 if (err) 2909 break; 2910 } 2911 2912 first = 0; bit_b++; 2913 } 2914 if (!err) 2915 err = proc_put_char(&buffer, &left, '\n'); 2916 } 2917 2918 if (!err) { 2919 if (write) { 2920 if (*ppos) 2921 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2922 else 2923 memcpy(bitmap, tmp_bitmap, 2924 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2925 } 2926 kfree(tmp_bitmap); 2927 *lenp -= left; 2928 *ppos += *lenp; 2929 return 0; 2930 } else { 2931 kfree(tmp_bitmap); 2932 return err; 2933 } 2934 } 2935 2936 #else /* CONFIG_PROC_SYSCTL */ 2937 2938 int proc_dostring(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(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_minmax(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_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_userhz_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_dointvec_ms_jiffies(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_minmax(struct ctl_table *table, int write, 2975 void __user *buffer, size_t *lenp, loff_t *ppos) 2976 { 2977 return -ENOSYS; 2978 } 2979 2980 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2981 void __user *buffer, 2982 size_t *lenp, loff_t *ppos) 2983 { 2984 return -ENOSYS; 2985 } 2986 2987 2988 #endif /* CONFIG_PROC_SYSCTL */ 2989 2990 /* 2991 * No sense putting this after each symbol definition, twice, 2992 * exception granted :-) 2993 */ 2994 EXPORT_SYMBOL(proc_dointvec); 2995 EXPORT_SYMBOL(proc_dointvec_jiffies); 2996 EXPORT_SYMBOL(proc_dointvec_minmax); 2997 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2998 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2999 EXPORT_SYMBOL(proc_dostring); 3000 EXPORT_SYMBOL(proc_doulongvec_minmax); 3001 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3002 EXPORT_SYMBOL(register_sysctl_table); 3003 EXPORT_SYMBOL(register_sysctl_paths); 3004 EXPORT_SYMBOL(unregister_sysctl_table); 3005