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