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/bitmap.h> 27 #include <linux/signal.h> 28 #include <linux/printk.h> 29 #include <linux/proc_fs.h> 30 #include <linux/security.h> 31 #include <linux/ctype.h> 32 #include <linux/kmemcheck.h> 33 #include <linux/fs.h> 34 #include <linux/init.h> 35 #include <linux/kernel.h> 36 #include <linux/kobject.h> 37 #include <linux/net.h> 38 #include <linux/sysrq.h> 39 #include <linux/highuid.h> 40 #include <linux/writeback.h> 41 #include <linux/ratelimit.h> 42 #include <linux/compaction.h> 43 #include <linux/hugetlb.h> 44 #include <linux/initrd.h> 45 #include <linux/key.h> 46 #include <linux/times.h> 47 #include <linux/limits.h> 48 #include <linux/dcache.h> 49 #include <linux/dnotify.h> 50 #include <linux/syscalls.h> 51 #include <linux/vmstat.h> 52 #include <linux/nfs_fs.h> 53 #include <linux/acpi.h> 54 #include <linux/reboot.h> 55 #include <linux/ftrace.h> 56 #include <linux/perf_event.h> 57 #include <linux/kprobes.h> 58 #include <linux/pipe_fs_i.h> 59 #include <linux/oom.h> 60 #include <linux/kmod.h> 61 #include <linux/capability.h> 62 #include <linux/binfmts.h> 63 64 #include <asm/uaccess.h> 65 #include <asm/processor.h> 66 67 #ifdef CONFIG_X86 68 #include <asm/nmi.h> 69 #include <asm/stacktrace.h> 70 #include <asm/io.h> 71 #endif 72 #ifdef CONFIG_SPARC 73 #include <asm/setup.h> 74 #endif 75 #ifdef CONFIG_BSD_PROCESS_ACCT 76 #include <linux/acct.h> 77 #endif 78 #ifdef CONFIG_RT_MUTEXES 79 #include <linux/rtmutex.h> 80 #endif 81 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 82 #include <linux/lockdep.h> 83 #endif 84 #ifdef CONFIG_CHR_DEV_SG 85 #include <scsi/sg.h> 86 #endif 87 88 #ifdef CONFIG_LOCKUP_DETECTOR 89 #include <linux/nmi.h> 90 #endif 91 92 93 #if defined(CONFIG_SYSCTL) 94 95 /* External variables not in a header file. */ 96 extern int sysctl_overcommit_memory; 97 extern int sysctl_overcommit_ratio; 98 extern int max_threads; 99 extern int core_uses_pid; 100 extern int suid_dumpable; 101 extern char core_pattern[]; 102 extern unsigned int core_pipe_limit; 103 extern int pid_max; 104 extern int min_free_kbytes; 105 extern int pid_max_min, pid_max_max; 106 extern int sysctl_drop_caches; 107 extern int percpu_pagelist_fraction; 108 extern int compat_log; 109 extern int latencytop_enabled; 110 extern int sysctl_nr_open_min, sysctl_nr_open_max; 111 #ifndef CONFIG_MMU 112 extern int sysctl_nr_trim_pages; 113 #endif 114 #ifdef CONFIG_BLOCK 115 extern int blk_iopoll_enabled; 116 #endif 117 118 /* Constants used for minimum and maximum */ 119 #ifdef CONFIG_LOCKUP_DETECTOR 120 static int sixty = 60; 121 static int neg_one = -1; 122 #endif 123 124 static int zero; 125 static int __maybe_unused one = 1; 126 static int __maybe_unused two = 2; 127 static int __maybe_unused three = 3; 128 static unsigned long one_ul = 1; 129 static int one_hundred = 100; 130 #ifdef CONFIG_PRINTK 131 static int ten_thousand = 10000; 132 #endif 133 134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 136 137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 138 static int maxolduid = 65535; 139 static int minolduid; 140 static int min_percpu_pagelist_fract = 8; 141 142 static int ngroups_max = NGROUPS_MAX; 143 static const int cap_last_cap = CAP_LAST_CAP; 144 145 #ifdef CONFIG_INOTIFY_USER 146 #include <linux/inotify.h> 147 #endif 148 #ifdef CONFIG_SPARC 149 #endif 150 151 #ifdef CONFIG_SPARC64 152 extern int sysctl_tsb_ratio; 153 #endif 154 155 #ifdef __hppa__ 156 extern int pwrsw_enabled; 157 extern int unaligned_enabled; 158 #endif 159 160 #ifdef CONFIG_IA64 161 extern int no_unaligned_warning; 162 extern int unaligned_dump_stack; 163 #endif 164 165 #ifdef CONFIG_PROC_SYSCTL 166 static int proc_do_cad_pid(struct ctl_table *table, int write, 167 void __user *buffer, size_t *lenp, loff_t *ppos); 168 static int proc_taint(struct ctl_table *table, int write, 169 void __user *buffer, size_t *lenp, loff_t *ppos); 170 #endif 171 172 #ifdef CONFIG_PRINTK 173 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 174 void __user *buffer, size_t *lenp, loff_t *ppos); 175 #endif 176 177 #ifdef CONFIG_MAGIC_SYSRQ 178 /* Note: sysrq code uses it's own private copy */ 179 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 180 181 static int sysrq_sysctl_handler(ctl_table *table, int write, 182 void __user *buffer, size_t *lenp, 183 loff_t *ppos) 184 { 185 int error; 186 187 error = proc_dointvec(table, write, buffer, lenp, ppos); 188 if (error) 189 return error; 190 191 if (write) 192 sysrq_toggle_support(__sysrq_enabled); 193 194 return 0; 195 } 196 197 #endif 198 199 static struct ctl_table kern_table[]; 200 static struct ctl_table vm_table[]; 201 static struct ctl_table fs_table[]; 202 static struct ctl_table debug_table[]; 203 static struct ctl_table dev_table[]; 204 extern struct ctl_table random_table[]; 205 #ifdef CONFIG_EPOLL 206 extern struct ctl_table epoll_table[]; 207 #endif 208 209 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 210 int sysctl_legacy_va_layout; 211 #endif 212 213 /* The default sysctl tables: */ 214 215 static struct ctl_table sysctl_base_table[] = { 216 { 217 .procname = "kernel", 218 .mode = 0555, 219 .child = kern_table, 220 }, 221 { 222 .procname = "vm", 223 .mode = 0555, 224 .child = vm_table, 225 }, 226 { 227 .procname = "fs", 228 .mode = 0555, 229 .child = fs_table, 230 }, 231 { 232 .procname = "debug", 233 .mode = 0555, 234 .child = debug_table, 235 }, 236 { 237 .procname = "dev", 238 .mode = 0555, 239 .child = dev_table, 240 }, 241 { } 242 }; 243 244 #ifdef CONFIG_SCHED_DEBUG 245 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 246 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 247 static int min_wakeup_granularity_ns; /* 0 usecs */ 248 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 249 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 250 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 251 #endif 252 253 #ifdef CONFIG_COMPACTION 254 static int min_extfrag_threshold; 255 static int max_extfrag_threshold = 1000; 256 #endif 257 258 static struct ctl_table kern_table[] = { 259 { 260 .procname = "sched_child_runs_first", 261 .data = &sysctl_sched_child_runs_first, 262 .maxlen = sizeof(unsigned int), 263 .mode = 0644, 264 .proc_handler = proc_dointvec, 265 }, 266 #ifdef CONFIG_SCHED_DEBUG 267 { 268 .procname = "sched_min_granularity_ns", 269 .data = &sysctl_sched_min_granularity, 270 .maxlen = sizeof(unsigned int), 271 .mode = 0644, 272 .proc_handler = sched_proc_update_handler, 273 .extra1 = &min_sched_granularity_ns, 274 .extra2 = &max_sched_granularity_ns, 275 }, 276 { 277 .procname = "sched_latency_ns", 278 .data = &sysctl_sched_latency, 279 .maxlen = sizeof(unsigned int), 280 .mode = 0644, 281 .proc_handler = sched_proc_update_handler, 282 .extra1 = &min_sched_granularity_ns, 283 .extra2 = &max_sched_granularity_ns, 284 }, 285 { 286 .procname = "sched_wakeup_granularity_ns", 287 .data = &sysctl_sched_wakeup_granularity, 288 .maxlen = sizeof(unsigned int), 289 .mode = 0644, 290 .proc_handler = sched_proc_update_handler, 291 .extra1 = &min_wakeup_granularity_ns, 292 .extra2 = &max_wakeup_granularity_ns, 293 }, 294 { 295 .procname = "sched_tunable_scaling", 296 .data = &sysctl_sched_tunable_scaling, 297 .maxlen = sizeof(enum sched_tunable_scaling), 298 .mode = 0644, 299 .proc_handler = sched_proc_update_handler, 300 .extra1 = &min_sched_tunable_scaling, 301 .extra2 = &max_sched_tunable_scaling, 302 }, 303 { 304 .procname = "sched_migration_cost", 305 .data = &sysctl_sched_migration_cost, 306 .maxlen = sizeof(unsigned int), 307 .mode = 0644, 308 .proc_handler = proc_dointvec, 309 }, 310 { 311 .procname = "sched_nr_migrate", 312 .data = &sysctl_sched_nr_migrate, 313 .maxlen = sizeof(unsigned int), 314 .mode = 0644, 315 .proc_handler = proc_dointvec, 316 }, 317 { 318 .procname = "sched_time_avg", 319 .data = &sysctl_sched_time_avg, 320 .maxlen = sizeof(unsigned int), 321 .mode = 0644, 322 .proc_handler = proc_dointvec, 323 }, 324 { 325 .procname = "sched_shares_window", 326 .data = &sysctl_sched_shares_window, 327 .maxlen = sizeof(unsigned int), 328 .mode = 0644, 329 .proc_handler = proc_dointvec, 330 }, 331 { 332 .procname = "timer_migration", 333 .data = &sysctl_timer_migration, 334 .maxlen = sizeof(unsigned int), 335 .mode = 0644, 336 .proc_handler = proc_dointvec_minmax, 337 .extra1 = &zero, 338 .extra2 = &one, 339 }, 340 #endif 341 { 342 .procname = "sched_rt_period_us", 343 .data = &sysctl_sched_rt_period, 344 .maxlen = sizeof(unsigned int), 345 .mode = 0644, 346 .proc_handler = sched_rt_handler, 347 }, 348 { 349 .procname = "sched_rt_runtime_us", 350 .data = &sysctl_sched_rt_runtime, 351 .maxlen = sizeof(int), 352 .mode = 0644, 353 .proc_handler = sched_rt_handler, 354 }, 355 #ifdef CONFIG_SCHED_AUTOGROUP 356 { 357 .procname = "sched_autogroup_enabled", 358 .data = &sysctl_sched_autogroup_enabled, 359 .maxlen = sizeof(unsigned int), 360 .mode = 0644, 361 .proc_handler = proc_dointvec_minmax, 362 .extra1 = &zero, 363 .extra2 = &one, 364 }, 365 #endif 366 #ifdef CONFIG_CFS_BANDWIDTH 367 { 368 .procname = "sched_cfs_bandwidth_slice_us", 369 .data = &sysctl_sched_cfs_bandwidth_slice, 370 .maxlen = sizeof(unsigned int), 371 .mode = 0644, 372 .proc_handler = proc_dointvec_minmax, 373 .extra1 = &one, 374 }, 375 #endif 376 #ifdef CONFIG_PROVE_LOCKING 377 { 378 .procname = "prove_locking", 379 .data = &prove_locking, 380 .maxlen = sizeof(int), 381 .mode = 0644, 382 .proc_handler = proc_dointvec, 383 }, 384 #endif 385 #ifdef CONFIG_LOCK_STAT 386 { 387 .procname = "lock_stat", 388 .data = &lock_stat, 389 .maxlen = sizeof(int), 390 .mode = 0644, 391 .proc_handler = proc_dointvec, 392 }, 393 #endif 394 { 395 .procname = "panic", 396 .data = &panic_timeout, 397 .maxlen = sizeof(int), 398 .mode = 0644, 399 .proc_handler = proc_dointvec, 400 }, 401 { 402 .procname = "core_uses_pid", 403 .data = &core_uses_pid, 404 .maxlen = sizeof(int), 405 .mode = 0644, 406 .proc_handler = proc_dointvec, 407 }, 408 { 409 .procname = "core_pattern", 410 .data = core_pattern, 411 .maxlen = CORENAME_MAX_SIZE, 412 .mode = 0644, 413 .proc_handler = proc_dostring, 414 }, 415 { 416 .procname = "core_pipe_limit", 417 .data = &core_pipe_limit, 418 .maxlen = sizeof(unsigned int), 419 .mode = 0644, 420 .proc_handler = proc_dointvec, 421 }, 422 #ifdef CONFIG_PROC_SYSCTL 423 { 424 .procname = "tainted", 425 .maxlen = sizeof(long), 426 .mode = 0644, 427 .proc_handler = proc_taint, 428 }, 429 #endif 430 #ifdef CONFIG_LATENCYTOP 431 { 432 .procname = "latencytop", 433 .data = &latencytop_enabled, 434 .maxlen = sizeof(int), 435 .mode = 0644, 436 .proc_handler = proc_dointvec, 437 }, 438 #endif 439 #ifdef CONFIG_BLK_DEV_INITRD 440 { 441 .procname = "real-root-dev", 442 .data = &real_root_dev, 443 .maxlen = sizeof(int), 444 .mode = 0644, 445 .proc_handler = proc_dointvec, 446 }, 447 #endif 448 { 449 .procname = "print-fatal-signals", 450 .data = &print_fatal_signals, 451 .maxlen = sizeof(int), 452 .mode = 0644, 453 .proc_handler = proc_dointvec, 454 }, 455 #ifdef CONFIG_SPARC 456 { 457 .procname = "reboot-cmd", 458 .data = reboot_command, 459 .maxlen = 256, 460 .mode = 0644, 461 .proc_handler = proc_dostring, 462 }, 463 { 464 .procname = "stop-a", 465 .data = &stop_a_enabled, 466 .maxlen = sizeof (int), 467 .mode = 0644, 468 .proc_handler = proc_dointvec, 469 }, 470 { 471 .procname = "scons-poweroff", 472 .data = &scons_pwroff, 473 .maxlen = sizeof (int), 474 .mode = 0644, 475 .proc_handler = proc_dointvec, 476 }, 477 #endif 478 #ifdef CONFIG_SPARC64 479 { 480 .procname = "tsb-ratio", 481 .data = &sysctl_tsb_ratio, 482 .maxlen = sizeof (int), 483 .mode = 0644, 484 .proc_handler = proc_dointvec, 485 }, 486 #endif 487 #ifdef __hppa__ 488 { 489 .procname = "soft-power", 490 .data = &pwrsw_enabled, 491 .maxlen = sizeof (int), 492 .mode = 0644, 493 .proc_handler = proc_dointvec, 494 }, 495 { 496 .procname = "unaligned-trap", 497 .data = &unaligned_enabled, 498 .maxlen = sizeof (int), 499 .mode = 0644, 500 .proc_handler = proc_dointvec, 501 }, 502 #endif 503 { 504 .procname = "ctrl-alt-del", 505 .data = &C_A_D, 506 .maxlen = sizeof(int), 507 .mode = 0644, 508 .proc_handler = proc_dointvec, 509 }, 510 #ifdef CONFIG_FUNCTION_TRACER 511 { 512 .procname = "ftrace_enabled", 513 .data = &ftrace_enabled, 514 .maxlen = sizeof(int), 515 .mode = 0644, 516 .proc_handler = ftrace_enable_sysctl, 517 }, 518 #endif 519 #ifdef CONFIG_STACK_TRACER 520 { 521 .procname = "stack_tracer_enabled", 522 .data = &stack_tracer_enabled, 523 .maxlen = sizeof(int), 524 .mode = 0644, 525 .proc_handler = stack_trace_sysctl, 526 }, 527 #endif 528 #ifdef CONFIG_TRACING 529 { 530 .procname = "ftrace_dump_on_oops", 531 .data = &ftrace_dump_on_oops, 532 .maxlen = sizeof(int), 533 .mode = 0644, 534 .proc_handler = proc_dointvec, 535 }, 536 #endif 537 #ifdef CONFIG_MODULES 538 { 539 .procname = "modprobe", 540 .data = &modprobe_path, 541 .maxlen = KMOD_PATH_LEN, 542 .mode = 0644, 543 .proc_handler = proc_dostring, 544 }, 545 { 546 .procname = "modules_disabled", 547 .data = &modules_disabled, 548 .maxlen = sizeof(int), 549 .mode = 0644, 550 /* only handle a transition from default "0" to "1" */ 551 .proc_handler = proc_dointvec_minmax, 552 .extra1 = &one, 553 .extra2 = &one, 554 }, 555 #endif 556 #ifdef CONFIG_HOTPLUG 557 { 558 .procname = "hotplug", 559 .data = &uevent_helper, 560 .maxlen = UEVENT_HELPER_PATH_LEN, 561 .mode = 0644, 562 .proc_handler = proc_dostring, 563 }, 564 #endif 565 #ifdef CONFIG_CHR_DEV_SG 566 { 567 .procname = "sg-big-buff", 568 .data = &sg_big_buff, 569 .maxlen = sizeof (int), 570 .mode = 0444, 571 .proc_handler = proc_dointvec, 572 }, 573 #endif 574 #ifdef CONFIG_BSD_PROCESS_ACCT 575 { 576 .procname = "acct", 577 .data = &acct_parm, 578 .maxlen = 3*sizeof(int), 579 .mode = 0644, 580 .proc_handler = proc_dointvec, 581 }, 582 #endif 583 #ifdef CONFIG_MAGIC_SYSRQ 584 { 585 .procname = "sysrq", 586 .data = &__sysrq_enabled, 587 .maxlen = sizeof (int), 588 .mode = 0644, 589 .proc_handler = sysrq_sysctl_handler, 590 }, 591 #endif 592 #ifdef CONFIG_PROC_SYSCTL 593 { 594 .procname = "cad_pid", 595 .data = NULL, 596 .maxlen = sizeof (int), 597 .mode = 0600, 598 .proc_handler = proc_do_cad_pid, 599 }, 600 #endif 601 { 602 .procname = "threads-max", 603 .data = &max_threads, 604 .maxlen = sizeof(int), 605 .mode = 0644, 606 .proc_handler = proc_dointvec, 607 }, 608 { 609 .procname = "random", 610 .mode = 0555, 611 .child = random_table, 612 }, 613 { 614 .procname = "usermodehelper", 615 .mode = 0555, 616 .child = usermodehelper_table, 617 }, 618 { 619 .procname = "overflowuid", 620 .data = &overflowuid, 621 .maxlen = sizeof(int), 622 .mode = 0644, 623 .proc_handler = proc_dointvec_minmax, 624 .extra1 = &minolduid, 625 .extra2 = &maxolduid, 626 }, 627 { 628 .procname = "overflowgid", 629 .data = &overflowgid, 630 .maxlen = sizeof(int), 631 .mode = 0644, 632 .proc_handler = proc_dointvec_minmax, 633 .extra1 = &minolduid, 634 .extra2 = &maxolduid, 635 }, 636 #ifdef CONFIG_S390 637 #ifdef CONFIG_MATHEMU 638 { 639 .procname = "ieee_emulation_warnings", 640 .data = &sysctl_ieee_emulation_warnings, 641 .maxlen = sizeof(int), 642 .mode = 0644, 643 .proc_handler = proc_dointvec, 644 }, 645 #endif 646 { 647 .procname = "userprocess_debug", 648 .data = &show_unhandled_signals, 649 .maxlen = sizeof(int), 650 .mode = 0644, 651 .proc_handler = proc_dointvec, 652 }, 653 #endif 654 { 655 .procname = "pid_max", 656 .data = &pid_max, 657 .maxlen = sizeof (int), 658 .mode = 0644, 659 .proc_handler = proc_dointvec_minmax, 660 .extra1 = &pid_max_min, 661 .extra2 = &pid_max_max, 662 }, 663 { 664 .procname = "panic_on_oops", 665 .data = &panic_on_oops, 666 .maxlen = sizeof(int), 667 .mode = 0644, 668 .proc_handler = proc_dointvec, 669 }, 670 #if defined CONFIG_PRINTK 671 { 672 .procname = "printk", 673 .data = &console_loglevel, 674 .maxlen = 4*sizeof(int), 675 .mode = 0644, 676 .proc_handler = proc_dointvec, 677 }, 678 { 679 .procname = "printk_ratelimit", 680 .data = &printk_ratelimit_state.interval, 681 .maxlen = sizeof(int), 682 .mode = 0644, 683 .proc_handler = proc_dointvec_jiffies, 684 }, 685 { 686 .procname = "printk_ratelimit_burst", 687 .data = &printk_ratelimit_state.burst, 688 .maxlen = sizeof(int), 689 .mode = 0644, 690 .proc_handler = proc_dointvec, 691 }, 692 { 693 .procname = "printk_delay", 694 .data = &printk_delay_msec, 695 .maxlen = sizeof(int), 696 .mode = 0644, 697 .proc_handler = proc_dointvec_minmax, 698 .extra1 = &zero, 699 .extra2 = &ten_thousand, 700 }, 701 { 702 .procname = "dmesg_restrict", 703 .data = &dmesg_restrict, 704 .maxlen = sizeof(int), 705 .mode = 0644, 706 .proc_handler = proc_dointvec_minmax_sysadmin, 707 .extra1 = &zero, 708 .extra2 = &one, 709 }, 710 { 711 .procname = "kptr_restrict", 712 .data = &kptr_restrict, 713 .maxlen = sizeof(int), 714 .mode = 0644, 715 .proc_handler = proc_dointvec_minmax_sysadmin, 716 .extra1 = &zero, 717 .extra2 = &two, 718 }, 719 #endif 720 { 721 .procname = "ngroups_max", 722 .data = &ngroups_max, 723 .maxlen = sizeof (int), 724 .mode = 0444, 725 .proc_handler = proc_dointvec, 726 }, 727 { 728 .procname = "cap_last_cap", 729 .data = (void *)&cap_last_cap, 730 .maxlen = sizeof(int), 731 .mode = 0444, 732 .proc_handler = proc_dointvec, 733 }, 734 #if defined(CONFIG_LOCKUP_DETECTOR) 735 { 736 .procname = "watchdog", 737 .data = &watchdog_enabled, 738 .maxlen = sizeof (int), 739 .mode = 0644, 740 .proc_handler = proc_dowatchdog, 741 .extra1 = &zero, 742 .extra2 = &one, 743 }, 744 { 745 .procname = "watchdog_thresh", 746 .data = &watchdog_thresh, 747 .maxlen = sizeof(int), 748 .mode = 0644, 749 .proc_handler = proc_dowatchdog, 750 .extra1 = &neg_one, 751 .extra2 = &sixty, 752 }, 753 { 754 .procname = "softlockup_panic", 755 .data = &softlockup_panic, 756 .maxlen = sizeof(int), 757 .mode = 0644, 758 .proc_handler = proc_dointvec_minmax, 759 .extra1 = &zero, 760 .extra2 = &one, 761 }, 762 { 763 .procname = "nmi_watchdog", 764 .data = &watchdog_enabled, 765 .maxlen = sizeof (int), 766 .mode = 0644, 767 .proc_handler = proc_dowatchdog, 768 .extra1 = &zero, 769 .extra2 = &one, 770 }, 771 #endif 772 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 773 { 774 .procname = "unknown_nmi_panic", 775 .data = &unknown_nmi_panic, 776 .maxlen = sizeof (int), 777 .mode = 0644, 778 .proc_handler = proc_dointvec, 779 }, 780 #endif 781 #if defined(CONFIG_X86) 782 { 783 .procname = "panic_on_unrecovered_nmi", 784 .data = &panic_on_unrecovered_nmi, 785 .maxlen = sizeof(int), 786 .mode = 0644, 787 .proc_handler = proc_dointvec, 788 }, 789 { 790 .procname = "panic_on_io_nmi", 791 .data = &panic_on_io_nmi, 792 .maxlen = sizeof(int), 793 .mode = 0644, 794 .proc_handler = proc_dointvec, 795 }, 796 #ifdef CONFIG_DEBUG_STACKOVERFLOW 797 { 798 .procname = "panic_on_stackoverflow", 799 .data = &sysctl_panic_on_stackoverflow, 800 .maxlen = sizeof(int), 801 .mode = 0644, 802 .proc_handler = proc_dointvec, 803 }, 804 #endif 805 { 806 .procname = "bootloader_type", 807 .data = &bootloader_type, 808 .maxlen = sizeof (int), 809 .mode = 0444, 810 .proc_handler = proc_dointvec, 811 }, 812 { 813 .procname = "bootloader_version", 814 .data = &bootloader_version, 815 .maxlen = sizeof (int), 816 .mode = 0444, 817 .proc_handler = proc_dointvec, 818 }, 819 { 820 .procname = "kstack_depth_to_print", 821 .data = &kstack_depth_to_print, 822 .maxlen = sizeof(int), 823 .mode = 0644, 824 .proc_handler = proc_dointvec, 825 }, 826 { 827 .procname = "io_delay_type", 828 .data = &io_delay_type, 829 .maxlen = sizeof(int), 830 .mode = 0644, 831 .proc_handler = proc_dointvec, 832 }, 833 #endif 834 #if defined(CONFIG_MMU) 835 { 836 .procname = "randomize_va_space", 837 .data = &randomize_va_space, 838 .maxlen = sizeof(int), 839 .mode = 0644, 840 .proc_handler = proc_dointvec, 841 }, 842 #endif 843 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 844 { 845 .procname = "spin_retry", 846 .data = &spin_retry, 847 .maxlen = sizeof (int), 848 .mode = 0644, 849 .proc_handler = proc_dointvec, 850 }, 851 #endif 852 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 853 { 854 .procname = "acpi_video_flags", 855 .data = &acpi_realmode_flags, 856 .maxlen = sizeof (unsigned long), 857 .mode = 0644, 858 .proc_handler = proc_doulongvec_minmax, 859 }, 860 #endif 861 #ifdef CONFIG_IA64 862 { 863 .procname = "ignore-unaligned-usertrap", 864 .data = &no_unaligned_warning, 865 .maxlen = sizeof (int), 866 .mode = 0644, 867 .proc_handler = proc_dointvec, 868 }, 869 { 870 .procname = "unaligned-dump-stack", 871 .data = &unaligned_dump_stack, 872 .maxlen = sizeof (int), 873 .mode = 0644, 874 .proc_handler = proc_dointvec, 875 }, 876 #endif 877 #ifdef CONFIG_DETECT_HUNG_TASK 878 { 879 .procname = "hung_task_panic", 880 .data = &sysctl_hung_task_panic, 881 .maxlen = sizeof(int), 882 .mode = 0644, 883 .proc_handler = proc_dointvec_minmax, 884 .extra1 = &zero, 885 .extra2 = &one, 886 }, 887 { 888 .procname = "hung_task_check_count", 889 .data = &sysctl_hung_task_check_count, 890 .maxlen = sizeof(unsigned long), 891 .mode = 0644, 892 .proc_handler = proc_doulongvec_minmax, 893 }, 894 { 895 .procname = "hung_task_timeout_secs", 896 .data = &sysctl_hung_task_timeout_secs, 897 .maxlen = sizeof(unsigned long), 898 .mode = 0644, 899 .proc_handler = proc_dohung_task_timeout_secs, 900 }, 901 { 902 .procname = "hung_task_warnings", 903 .data = &sysctl_hung_task_warnings, 904 .maxlen = sizeof(unsigned long), 905 .mode = 0644, 906 .proc_handler = proc_doulongvec_minmax, 907 }, 908 #endif 909 #ifdef CONFIG_COMPAT 910 { 911 .procname = "compat-log", 912 .data = &compat_log, 913 .maxlen = sizeof (int), 914 .mode = 0644, 915 .proc_handler = proc_dointvec, 916 }, 917 #endif 918 #ifdef CONFIG_RT_MUTEXES 919 { 920 .procname = "max_lock_depth", 921 .data = &max_lock_depth, 922 .maxlen = sizeof(int), 923 .mode = 0644, 924 .proc_handler = proc_dointvec, 925 }, 926 #endif 927 { 928 .procname = "poweroff_cmd", 929 .data = &poweroff_cmd, 930 .maxlen = POWEROFF_CMD_PATH_LEN, 931 .mode = 0644, 932 .proc_handler = proc_dostring, 933 }, 934 #ifdef CONFIG_KEYS 935 { 936 .procname = "keys", 937 .mode = 0555, 938 .child = key_sysctls, 939 }, 940 #endif 941 #ifdef CONFIG_RCU_TORTURE_TEST 942 { 943 .procname = "rcutorture_runnable", 944 .data = &rcutorture_runnable, 945 .maxlen = sizeof(int), 946 .mode = 0644, 947 .proc_handler = proc_dointvec, 948 }, 949 #endif 950 #ifdef CONFIG_PERF_EVENTS 951 /* 952 * User-space scripts rely on the existence of this file 953 * as a feature check for perf_events being enabled. 954 * 955 * So it's an ABI, do not remove! 956 */ 957 { 958 .procname = "perf_event_paranoid", 959 .data = &sysctl_perf_event_paranoid, 960 .maxlen = sizeof(sysctl_perf_event_paranoid), 961 .mode = 0644, 962 .proc_handler = proc_dointvec, 963 }, 964 { 965 .procname = "perf_event_mlock_kb", 966 .data = &sysctl_perf_event_mlock, 967 .maxlen = sizeof(sysctl_perf_event_mlock), 968 .mode = 0644, 969 .proc_handler = proc_dointvec, 970 }, 971 { 972 .procname = "perf_event_max_sample_rate", 973 .data = &sysctl_perf_event_sample_rate, 974 .maxlen = sizeof(sysctl_perf_event_sample_rate), 975 .mode = 0644, 976 .proc_handler = perf_proc_update_handler, 977 }, 978 #endif 979 #ifdef CONFIG_KMEMCHECK 980 { 981 .procname = "kmemcheck", 982 .data = &kmemcheck_enabled, 983 .maxlen = sizeof(int), 984 .mode = 0644, 985 .proc_handler = proc_dointvec, 986 }, 987 #endif 988 #ifdef CONFIG_BLOCK 989 { 990 .procname = "blk_iopoll", 991 .data = &blk_iopoll_enabled, 992 .maxlen = sizeof(int), 993 .mode = 0644, 994 .proc_handler = proc_dointvec, 995 }, 996 #endif 997 { } 998 }; 999 1000 static struct ctl_table vm_table[] = { 1001 { 1002 .procname = "overcommit_memory", 1003 .data = &sysctl_overcommit_memory, 1004 .maxlen = sizeof(sysctl_overcommit_memory), 1005 .mode = 0644, 1006 .proc_handler = proc_dointvec_minmax, 1007 .extra1 = &zero, 1008 .extra2 = &two, 1009 }, 1010 { 1011 .procname = "panic_on_oom", 1012 .data = &sysctl_panic_on_oom, 1013 .maxlen = sizeof(sysctl_panic_on_oom), 1014 .mode = 0644, 1015 .proc_handler = proc_dointvec_minmax, 1016 .extra1 = &zero, 1017 .extra2 = &two, 1018 }, 1019 { 1020 .procname = "oom_kill_allocating_task", 1021 .data = &sysctl_oom_kill_allocating_task, 1022 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1023 .mode = 0644, 1024 .proc_handler = proc_dointvec, 1025 }, 1026 { 1027 .procname = "oom_dump_tasks", 1028 .data = &sysctl_oom_dump_tasks, 1029 .maxlen = sizeof(sysctl_oom_dump_tasks), 1030 .mode = 0644, 1031 .proc_handler = proc_dointvec, 1032 }, 1033 { 1034 .procname = "overcommit_ratio", 1035 .data = &sysctl_overcommit_ratio, 1036 .maxlen = sizeof(sysctl_overcommit_ratio), 1037 .mode = 0644, 1038 .proc_handler = proc_dointvec, 1039 }, 1040 { 1041 .procname = "page-cluster", 1042 .data = &page_cluster, 1043 .maxlen = sizeof(int), 1044 .mode = 0644, 1045 .proc_handler = proc_dointvec_minmax, 1046 .extra1 = &zero, 1047 }, 1048 { 1049 .procname = "dirty_background_ratio", 1050 .data = &dirty_background_ratio, 1051 .maxlen = sizeof(dirty_background_ratio), 1052 .mode = 0644, 1053 .proc_handler = dirty_background_ratio_handler, 1054 .extra1 = &zero, 1055 .extra2 = &one_hundred, 1056 }, 1057 { 1058 .procname = "dirty_background_bytes", 1059 .data = &dirty_background_bytes, 1060 .maxlen = sizeof(dirty_background_bytes), 1061 .mode = 0644, 1062 .proc_handler = dirty_background_bytes_handler, 1063 .extra1 = &one_ul, 1064 }, 1065 { 1066 .procname = "dirty_ratio", 1067 .data = &vm_dirty_ratio, 1068 .maxlen = sizeof(vm_dirty_ratio), 1069 .mode = 0644, 1070 .proc_handler = dirty_ratio_handler, 1071 .extra1 = &zero, 1072 .extra2 = &one_hundred, 1073 }, 1074 { 1075 .procname = "dirty_bytes", 1076 .data = &vm_dirty_bytes, 1077 .maxlen = sizeof(vm_dirty_bytes), 1078 .mode = 0644, 1079 .proc_handler = dirty_bytes_handler, 1080 .extra1 = &dirty_bytes_min, 1081 }, 1082 { 1083 .procname = "dirty_writeback_centisecs", 1084 .data = &dirty_writeback_interval, 1085 .maxlen = sizeof(dirty_writeback_interval), 1086 .mode = 0644, 1087 .proc_handler = dirty_writeback_centisecs_handler, 1088 }, 1089 { 1090 .procname = "dirty_expire_centisecs", 1091 .data = &dirty_expire_interval, 1092 .maxlen = sizeof(dirty_expire_interval), 1093 .mode = 0644, 1094 .proc_handler = proc_dointvec_minmax, 1095 .extra1 = &zero, 1096 }, 1097 { 1098 .procname = "nr_pdflush_threads", 1099 .data = &nr_pdflush_threads, 1100 .maxlen = sizeof nr_pdflush_threads, 1101 .mode = 0444 /* read-only*/, 1102 .proc_handler = proc_dointvec, 1103 }, 1104 { 1105 .procname = "swappiness", 1106 .data = &vm_swappiness, 1107 .maxlen = sizeof(vm_swappiness), 1108 .mode = 0644, 1109 .proc_handler = proc_dointvec_minmax, 1110 .extra1 = &zero, 1111 .extra2 = &one_hundred, 1112 }, 1113 #ifdef CONFIG_HUGETLB_PAGE 1114 { 1115 .procname = "nr_hugepages", 1116 .data = NULL, 1117 .maxlen = sizeof(unsigned long), 1118 .mode = 0644, 1119 .proc_handler = hugetlb_sysctl_handler, 1120 .extra1 = (void *)&hugetlb_zero, 1121 .extra2 = (void *)&hugetlb_infinity, 1122 }, 1123 #ifdef CONFIG_NUMA 1124 { 1125 .procname = "nr_hugepages_mempolicy", 1126 .data = NULL, 1127 .maxlen = sizeof(unsigned long), 1128 .mode = 0644, 1129 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1130 .extra1 = (void *)&hugetlb_zero, 1131 .extra2 = (void *)&hugetlb_infinity, 1132 }, 1133 #endif 1134 { 1135 .procname = "hugetlb_shm_group", 1136 .data = &sysctl_hugetlb_shm_group, 1137 .maxlen = sizeof(gid_t), 1138 .mode = 0644, 1139 .proc_handler = proc_dointvec, 1140 }, 1141 { 1142 .procname = "hugepages_treat_as_movable", 1143 .data = &hugepages_treat_as_movable, 1144 .maxlen = sizeof(int), 1145 .mode = 0644, 1146 .proc_handler = hugetlb_treat_movable_handler, 1147 }, 1148 { 1149 .procname = "nr_overcommit_hugepages", 1150 .data = NULL, 1151 .maxlen = sizeof(unsigned long), 1152 .mode = 0644, 1153 .proc_handler = hugetlb_overcommit_handler, 1154 .extra1 = (void *)&hugetlb_zero, 1155 .extra2 = (void *)&hugetlb_infinity, 1156 }, 1157 #endif 1158 { 1159 .procname = "lowmem_reserve_ratio", 1160 .data = &sysctl_lowmem_reserve_ratio, 1161 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1162 .mode = 0644, 1163 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1164 }, 1165 { 1166 .procname = "drop_caches", 1167 .data = &sysctl_drop_caches, 1168 .maxlen = sizeof(int), 1169 .mode = 0644, 1170 .proc_handler = drop_caches_sysctl_handler, 1171 .extra1 = &one, 1172 .extra2 = &three, 1173 }, 1174 #ifdef CONFIG_COMPACTION 1175 { 1176 .procname = "compact_memory", 1177 .data = &sysctl_compact_memory, 1178 .maxlen = sizeof(int), 1179 .mode = 0200, 1180 .proc_handler = sysctl_compaction_handler, 1181 }, 1182 { 1183 .procname = "extfrag_threshold", 1184 .data = &sysctl_extfrag_threshold, 1185 .maxlen = sizeof(int), 1186 .mode = 0644, 1187 .proc_handler = sysctl_extfrag_handler, 1188 .extra1 = &min_extfrag_threshold, 1189 .extra2 = &max_extfrag_threshold, 1190 }, 1191 1192 #endif /* CONFIG_COMPACTION */ 1193 { 1194 .procname = "min_free_kbytes", 1195 .data = &min_free_kbytes, 1196 .maxlen = sizeof(min_free_kbytes), 1197 .mode = 0644, 1198 .proc_handler = min_free_kbytes_sysctl_handler, 1199 .extra1 = &zero, 1200 }, 1201 { 1202 .procname = "percpu_pagelist_fraction", 1203 .data = &percpu_pagelist_fraction, 1204 .maxlen = sizeof(percpu_pagelist_fraction), 1205 .mode = 0644, 1206 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1207 .extra1 = &min_percpu_pagelist_fract, 1208 }, 1209 #ifdef CONFIG_MMU 1210 { 1211 .procname = "max_map_count", 1212 .data = &sysctl_max_map_count, 1213 .maxlen = sizeof(sysctl_max_map_count), 1214 .mode = 0644, 1215 .proc_handler = proc_dointvec_minmax, 1216 .extra1 = &zero, 1217 }, 1218 #else 1219 { 1220 .procname = "nr_trim_pages", 1221 .data = &sysctl_nr_trim_pages, 1222 .maxlen = sizeof(sysctl_nr_trim_pages), 1223 .mode = 0644, 1224 .proc_handler = proc_dointvec_minmax, 1225 .extra1 = &zero, 1226 }, 1227 #endif 1228 { 1229 .procname = "laptop_mode", 1230 .data = &laptop_mode, 1231 .maxlen = sizeof(laptop_mode), 1232 .mode = 0644, 1233 .proc_handler = proc_dointvec_jiffies, 1234 }, 1235 { 1236 .procname = "block_dump", 1237 .data = &block_dump, 1238 .maxlen = sizeof(block_dump), 1239 .mode = 0644, 1240 .proc_handler = proc_dointvec, 1241 .extra1 = &zero, 1242 }, 1243 { 1244 .procname = "vfs_cache_pressure", 1245 .data = &sysctl_vfs_cache_pressure, 1246 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1247 .mode = 0644, 1248 .proc_handler = proc_dointvec, 1249 .extra1 = &zero, 1250 }, 1251 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1252 { 1253 .procname = "legacy_va_layout", 1254 .data = &sysctl_legacy_va_layout, 1255 .maxlen = sizeof(sysctl_legacy_va_layout), 1256 .mode = 0644, 1257 .proc_handler = proc_dointvec, 1258 .extra1 = &zero, 1259 }, 1260 #endif 1261 #ifdef CONFIG_NUMA 1262 { 1263 .procname = "zone_reclaim_mode", 1264 .data = &zone_reclaim_mode, 1265 .maxlen = sizeof(zone_reclaim_mode), 1266 .mode = 0644, 1267 .proc_handler = proc_dointvec, 1268 .extra1 = &zero, 1269 }, 1270 { 1271 .procname = "min_unmapped_ratio", 1272 .data = &sysctl_min_unmapped_ratio, 1273 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1274 .mode = 0644, 1275 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1276 .extra1 = &zero, 1277 .extra2 = &one_hundred, 1278 }, 1279 { 1280 .procname = "min_slab_ratio", 1281 .data = &sysctl_min_slab_ratio, 1282 .maxlen = sizeof(sysctl_min_slab_ratio), 1283 .mode = 0644, 1284 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1285 .extra1 = &zero, 1286 .extra2 = &one_hundred, 1287 }, 1288 #endif 1289 #ifdef CONFIG_SMP 1290 { 1291 .procname = "stat_interval", 1292 .data = &sysctl_stat_interval, 1293 .maxlen = sizeof(sysctl_stat_interval), 1294 .mode = 0644, 1295 .proc_handler = proc_dointvec_jiffies, 1296 }, 1297 #endif 1298 #ifdef CONFIG_MMU 1299 { 1300 .procname = "mmap_min_addr", 1301 .data = &dac_mmap_min_addr, 1302 .maxlen = sizeof(unsigned long), 1303 .mode = 0644, 1304 .proc_handler = mmap_min_addr_handler, 1305 }, 1306 #endif 1307 #ifdef CONFIG_NUMA 1308 { 1309 .procname = "numa_zonelist_order", 1310 .data = &numa_zonelist_order, 1311 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1312 .mode = 0644, 1313 .proc_handler = numa_zonelist_order_handler, 1314 }, 1315 #endif 1316 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1317 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1318 { 1319 .procname = "vdso_enabled", 1320 .data = &vdso_enabled, 1321 .maxlen = sizeof(vdso_enabled), 1322 .mode = 0644, 1323 .proc_handler = proc_dointvec, 1324 .extra1 = &zero, 1325 }, 1326 #endif 1327 #ifdef CONFIG_HIGHMEM 1328 { 1329 .procname = "highmem_is_dirtyable", 1330 .data = &vm_highmem_is_dirtyable, 1331 .maxlen = sizeof(vm_highmem_is_dirtyable), 1332 .mode = 0644, 1333 .proc_handler = proc_dointvec_minmax, 1334 .extra1 = &zero, 1335 .extra2 = &one, 1336 }, 1337 #endif 1338 { 1339 .procname = "scan_unevictable_pages", 1340 .data = &scan_unevictable_pages, 1341 .maxlen = sizeof(scan_unevictable_pages), 1342 .mode = 0644, 1343 .proc_handler = scan_unevictable_handler, 1344 }, 1345 #ifdef CONFIG_MEMORY_FAILURE 1346 { 1347 .procname = "memory_failure_early_kill", 1348 .data = &sysctl_memory_failure_early_kill, 1349 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1350 .mode = 0644, 1351 .proc_handler = proc_dointvec_minmax, 1352 .extra1 = &zero, 1353 .extra2 = &one, 1354 }, 1355 { 1356 .procname = "memory_failure_recovery", 1357 .data = &sysctl_memory_failure_recovery, 1358 .maxlen = sizeof(sysctl_memory_failure_recovery), 1359 .mode = 0644, 1360 .proc_handler = proc_dointvec_minmax, 1361 .extra1 = &zero, 1362 .extra2 = &one, 1363 }, 1364 #endif 1365 { } 1366 }; 1367 1368 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1369 static struct ctl_table binfmt_misc_table[] = { 1370 { } 1371 }; 1372 #endif 1373 1374 static struct ctl_table fs_table[] = { 1375 { 1376 .procname = "inode-nr", 1377 .data = &inodes_stat, 1378 .maxlen = 2*sizeof(int), 1379 .mode = 0444, 1380 .proc_handler = proc_nr_inodes, 1381 }, 1382 { 1383 .procname = "inode-state", 1384 .data = &inodes_stat, 1385 .maxlen = 7*sizeof(int), 1386 .mode = 0444, 1387 .proc_handler = proc_nr_inodes, 1388 }, 1389 { 1390 .procname = "file-nr", 1391 .data = &files_stat, 1392 .maxlen = sizeof(files_stat), 1393 .mode = 0444, 1394 .proc_handler = proc_nr_files, 1395 }, 1396 { 1397 .procname = "file-max", 1398 .data = &files_stat.max_files, 1399 .maxlen = sizeof(files_stat.max_files), 1400 .mode = 0644, 1401 .proc_handler = proc_doulongvec_minmax, 1402 }, 1403 { 1404 .procname = "nr_open", 1405 .data = &sysctl_nr_open, 1406 .maxlen = sizeof(int), 1407 .mode = 0644, 1408 .proc_handler = proc_dointvec_minmax, 1409 .extra1 = &sysctl_nr_open_min, 1410 .extra2 = &sysctl_nr_open_max, 1411 }, 1412 { 1413 .procname = "dentry-state", 1414 .data = &dentry_stat, 1415 .maxlen = 6*sizeof(int), 1416 .mode = 0444, 1417 .proc_handler = proc_nr_dentry, 1418 }, 1419 { 1420 .procname = "overflowuid", 1421 .data = &fs_overflowuid, 1422 .maxlen = sizeof(int), 1423 .mode = 0644, 1424 .proc_handler = proc_dointvec_minmax, 1425 .extra1 = &minolduid, 1426 .extra2 = &maxolduid, 1427 }, 1428 { 1429 .procname = "overflowgid", 1430 .data = &fs_overflowgid, 1431 .maxlen = sizeof(int), 1432 .mode = 0644, 1433 .proc_handler = proc_dointvec_minmax, 1434 .extra1 = &minolduid, 1435 .extra2 = &maxolduid, 1436 }, 1437 #ifdef CONFIG_FILE_LOCKING 1438 { 1439 .procname = "leases-enable", 1440 .data = &leases_enable, 1441 .maxlen = sizeof(int), 1442 .mode = 0644, 1443 .proc_handler = proc_dointvec, 1444 }, 1445 #endif 1446 #ifdef CONFIG_DNOTIFY 1447 { 1448 .procname = "dir-notify-enable", 1449 .data = &dir_notify_enable, 1450 .maxlen = sizeof(int), 1451 .mode = 0644, 1452 .proc_handler = proc_dointvec, 1453 }, 1454 #endif 1455 #ifdef CONFIG_MMU 1456 #ifdef CONFIG_FILE_LOCKING 1457 { 1458 .procname = "lease-break-time", 1459 .data = &lease_break_time, 1460 .maxlen = sizeof(int), 1461 .mode = 0644, 1462 .proc_handler = proc_dointvec, 1463 }, 1464 #endif 1465 #ifdef CONFIG_AIO 1466 { 1467 .procname = "aio-nr", 1468 .data = &aio_nr, 1469 .maxlen = sizeof(aio_nr), 1470 .mode = 0444, 1471 .proc_handler = proc_doulongvec_minmax, 1472 }, 1473 { 1474 .procname = "aio-max-nr", 1475 .data = &aio_max_nr, 1476 .maxlen = sizeof(aio_max_nr), 1477 .mode = 0644, 1478 .proc_handler = proc_doulongvec_minmax, 1479 }, 1480 #endif /* CONFIG_AIO */ 1481 #ifdef CONFIG_INOTIFY_USER 1482 { 1483 .procname = "inotify", 1484 .mode = 0555, 1485 .child = inotify_table, 1486 }, 1487 #endif 1488 #ifdef CONFIG_EPOLL 1489 { 1490 .procname = "epoll", 1491 .mode = 0555, 1492 .child = epoll_table, 1493 }, 1494 #endif 1495 #endif 1496 { 1497 .procname = "suid_dumpable", 1498 .data = &suid_dumpable, 1499 .maxlen = sizeof(int), 1500 .mode = 0644, 1501 .proc_handler = proc_dointvec_minmax, 1502 .extra1 = &zero, 1503 .extra2 = &two, 1504 }, 1505 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1506 { 1507 .procname = "binfmt_misc", 1508 .mode = 0555, 1509 .child = binfmt_misc_table, 1510 }, 1511 #endif 1512 { 1513 .procname = "pipe-max-size", 1514 .data = &pipe_max_size, 1515 .maxlen = sizeof(int), 1516 .mode = 0644, 1517 .proc_handler = &pipe_proc_fn, 1518 .extra1 = &pipe_min_size, 1519 }, 1520 { } 1521 }; 1522 1523 static struct ctl_table debug_table[] = { 1524 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1525 defined(CONFIG_S390) || defined(CONFIG_TILE) 1526 { 1527 .procname = "exception-trace", 1528 .data = &show_unhandled_signals, 1529 .maxlen = sizeof(int), 1530 .mode = 0644, 1531 .proc_handler = proc_dointvec 1532 }, 1533 #endif 1534 #if defined(CONFIG_OPTPROBES) 1535 { 1536 .procname = "kprobes-optimization", 1537 .data = &sysctl_kprobes_optimization, 1538 .maxlen = sizeof(int), 1539 .mode = 0644, 1540 .proc_handler = proc_kprobes_optimization_handler, 1541 .extra1 = &zero, 1542 .extra2 = &one, 1543 }, 1544 #endif 1545 { } 1546 }; 1547 1548 static struct ctl_table dev_table[] = { 1549 { } 1550 }; 1551 1552 int __init sysctl_init(void) 1553 { 1554 register_sysctl_table(sysctl_base_table); 1555 return 0; 1556 } 1557 1558 #endif /* CONFIG_SYSCTL */ 1559 1560 /* 1561 * /proc/sys support 1562 */ 1563 1564 #ifdef CONFIG_PROC_SYSCTL 1565 1566 static int _proc_do_string(void* data, int maxlen, int write, 1567 void __user *buffer, 1568 size_t *lenp, loff_t *ppos) 1569 { 1570 size_t len; 1571 char __user *p; 1572 char c; 1573 1574 if (!data || !maxlen || !*lenp) { 1575 *lenp = 0; 1576 return 0; 1577 } 1578 1579 if (write) { 1580 len = 0; 1581 p = buffer; 1582 while (len < *lenp) { 1583 if (get_user(c, p++)) 1584 return -EFAULT; 1585 if (c == 0 || c == '\n') 1586 break; 1587 len++; 1588 } 1589 if (len >= maxlen) 1590 len = maxlen-1; 1591 if(copy_from_user(data, buffer, len)) 1592 return -EFAULT; 1593 ((char *) data)[len] = 0; 1594 *ppos += *lenp; 1595 } else { 1596 len = strlen(data); 1597 if (len > maxlen) 1598 len = maxlen; 1599 1600 if (*ppos > len) { 1601 *lenp = 0; 1602 return 0; 1603 } 1604 1605 data += *ppos; 1606 len -= *ppos; 1607 1608 if (len > *lenp) 1609 len = *lenp; 1610 if (len) 1611 if(copy_to_user(buffer, data, len)) 1612 return -EFAULT; 1613 if (len < *lenp) { 1614 if(put_user('\n', ((char __user *) buffer) + len)) 1615 return -EFAULT; 1616 len++; 1617 } 1618 *lenp = len; 1619 *ppos += len; 1620 } 1621 return 0; 1622 } 1623 1624 /** 1625 * proc_dostring - read a string sysctl 1626 * @table: the sysctl table 1627 * @write: %TRUE if this is a write to the sysctl file 1628 * @buffer: the user buffer 1629 * @lenp: the size of the user buffer 1630 * @ppos: file position 1631 * 1632 * Reads/writes a string from/to the user buffer. If the kernel 1633 * buffer provided is not large enough to hold the string, the 1634 * string is truncated. The copied string is %NULL-terminated. 1635 * If the string is being read by the user process, it is copied 1636 * and a newline '\n' is added. It is truncated if the buffer is 1637 * not large enough. 1638 * 1639 * Returns 0 on success. 1640 */ 1641 int proc_dostring(struct ctl_table *table, int write, 1642 void __user *buffer, size_t *lenp, loff_t *ppos) 1643 { 1644 return _proc_do_string(table->data, table->maxlen, write, 1645 buffer, lenp, ppos); 1646 } 1647 1648 static size_t proc_skip_spaces(char **buf) 1649 { 1650 size_t ret; 1651 char *tmp = skip_spaces(*buf); 1652 ret = tmp - *buf; 1653 *buf = tmp; 1654 return ret; 1655 } 1656 1657 static void proc_skip_char(char **buf, size_t *size, const char v) 1658 { 1659 while (*size) { 1660 if (**buf != v) 1661 break; 1662 (*size)--; 1663 (*buf)++; 1664 } 1665 } 1666 1667 #define TMPBUFLEN 22 1668 /** 1669 * proc_get_long - reads an ASCII formatted integer from a user buffer 1670 * 1671 * @buf: a kernel buffer 1672 * @size: size of the kernel buffer 1673 * @val: this is where the number will be stored 1674 * @neg: set to %TRUE if number is negative 1675 * @perm_tr: a vector which contains the allowed trailers 1676 * @perm_tr_len: size of the perm_tr vector 1677 * @tr: pointer to store the trailer character 1678 * 1679 * In case of success %0 is returned and @buf and @size are updated with 1680 * the amount of bytes read. If @tr is non-NULL and a trailing 1681 * character exists (size is non-zero after returning from this 1682 * function), @tr is updated with the trailing character. 1683 */ 1684 static int proc_get_long(char **buf, size_t *size, 1685 unsigned long *val, bool *neg, 1686 const char *perm_tr, unsigned perm_tr_len, char *tr) 1687 { 1688 int len; 1689 char *p, tmp[TMPBUFLEN]; 1690 1691 if (!*size) 1692 return -EINVAL; 1693 1694 len = *size; 1695 if (len > TMPBUFLEN - 1) 1696 len = TMPBUFLEN - 1; 1697 1698 memcpy(tmp, *buf, len); 1699 1700 tmp[len] = 0; 1701 p = tmp; 1702 if (*p == '-' && *size > 1) { 1703 *neg = true; 1704 p++; 1705 } else 1706 *neg = false; 1707 if (!isdigit(*p)) 1708 return -EINVAL; 1709 1710 *val = simple_strtoul(p, &p, 0); 1711 1712 len = p - tmp; 1713 1714 /* We don't know if the next char is whitespace thus we may accept 1715 * invalid integers (e.g. 1234...a) or two integers instead of one 1716 * (e.g. 123...1). So lets not allow such large numbers. */ 1717 if (len == TMPBUFLEN - 1) 1718 return -EINVAL; 1719 1720 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1721 return -EINVAL; 1722 1723 if (tr && (len < *size)) 1724 *tr = *p; 1725 1726 *buf += len; 1727 *size -= len; 1728 1729 return 0; 1730 } 1731 1732 /** 1733 * proc_put_long - converts an integer to a decimal ASCII formatted string 1734 * 1735 * @buf: the user buffer 1736 * @size: the size of the user buffer 1737 * @val: the integer to be converted 1738 * @neg: sign of the number, %TRUE for negative 1739 * 1740 * In case of success %0 is returned and @buf and @size are updated with 1741 * the amount of bytes written. 1742 */ 1743 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1744 bool neg) 1745 { 1746 int len; 1747 char tmp[TMPBUFLEN], *p = tmp; 1748 1749 sprintf(p, "%s%lu", neg ? "-" : "", val); 1750 len = strlen(tmp); 1751 if (len > *size) 1752 len = *size; 1753 if (copy_to_user(*buf, tmp, len)) 1754 return -EFAULT; 1755 *size -= len; 1756 *buf += len; 1757 return 0; 1758 } 1759 #undef TMPBUFLEN 1760 1761 static int proc_put_char(void __user **buf, size_t *size, char c) 1762 { 1763 if (*size) { 1764 char __user **buffer = (char __user **)buf; 1765 if (put_user(c, *buffer)) 1766 return -EFAULT; 1767 (*size)--, (*buffer)++; 1768 *buf = *buffer; 1769 } 1770 return 0; 1771 } 1772 1773 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1774 int *valp, 1775 int write, void *data) 1776 { 1777 if (write) { 1778 *valp = *negp ? -*lvalp : *lvalp; 1779 } else { 1780 int val = *valp; 1781 if (val < 0) { 1782 *negp = true; 1783 *lvalp = (unsigned long)-val; 1784 } else { 1785 *negp = false; 1786 *lvalp = (unsigned long)val; 1787 } 1788 } 1789 return 0; 1790 } 1791 1792 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1793 1794 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1795 int write, void __user *buffer, 1796 size_t *lenp, loff_t *ppos, 1797 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1798 int write, void *data), 1799 void *data) 1800 { 1801 int *i, vleft, first = 1, err = 0; 1802 unsigned long page = 0; 1803 size_t left; 1804 char *kbuf; 1805 1806 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1807 *lenp = 0; 1808 return 0; 1809 } 1810 1811 i = (int *) tbl_data; 1812 vleft = table->maxlen / sizeof(*i); 1813 left = *lenp; 1814 1815 if (!conv) 1816 conv = do_proc_dointvec_conv; 1817 1818 if (write) { 1819 if (left > PAGE_SIZE - 1) 1820 left = PAGE_SIZE - 1; 1821 page = __get_free_page(GFP_TEMPORARY); 1822 kbuf = (char *) page; 1823 if (!kbuf) 1824 return -ENOMEM; 1825 if (copy_from_user(kbuf, buffer, left)) { 1826 err = -EFAULT; 1827 goto free; 1828 } 1829 kbuf[left] = 0; 1830 } 1831 1832 for (; left && vleft--; i++, first=0) { 1833 unsigned long lval; 1834 bool neg; 1835 1836 if (write) { 1837 left -= proc_skip_spaces(&kbuf); 1838 1839 if (!left) 1840 break; 1841 err = proc_get_long(&kbuf, &left, &lval, &neg, 1842 proc_wspace_sep, 1843 sizeof(proc_wspace_sep), NULL); 1844 if (err) 1845 break; 1846 if (conv(&neg, &lval, i, 1, data)) { 1847 err = -EINVAL; 1848 break; 1849 } 1850 } else { 1851 if (conv(&neg, &lval, i, 0, data)) { 1852 err = -EINVAL; 1853 break; 1854 } 1855 if (!first) 1856 err = proc_put_char(&buffer, &left, '\t'); 1857 if (err) 1858 break; 1859 err = proc_put_long(&buffer, &left, lval, neg); 1860 if (err) 1861 break; 1862 } 1863 } 1864 1865 if (!write && !first && left && !err) 1866 err = proc_put_char(&buffer, &left, '\n'); 1867 if (write && !err && left) 1868 left -= proc_skip_spaces(&kbuf); 1869 free: 1870 if (write) { 1871 free_page(page); 1872 if (first) 1873 return err ? : -EINVAL; 1874 } 1875 *lenp -= left; 1876 *ppos += *lenp; 1877 return err; 1878 } 1879 1880 static int do_proc_dointvec(struct ctl_table *table, int write, 1881 void __user *buffer, size_t *lenp, loff_t *ppos, 1882 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1883 int write, void *data), 1884 void *data) 1885 { 1886 return __do_proc_dointvec(table->data, table, write, 1887 buffer, lenp, ppos, conv, data); 1888 } 1889 1890 /** 1891 * proc_dointvec - read a vector of integers 1892 * @table: the sysctl table 1893 * @write: %TRUE if this is a write to the sysctl file 1894 * @buffer: the user buffer 1895 * @lenp: the size of the user buffer 1896 * @ppos: file position 1897 * 1898 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1899 * values from/to the user buffer, treated as an ASCII string. 1900 * 1901 * Returns 0 on success. 1902 */ 1903 int proc_dointvec(struct ctl_table *table, int write, 1904 void __user *buffer, size_t *lenp, loff_t *ppos) 1905 { 1906 return do_proc_dointvec(table,write,buffer,lenp,ppos, 1907 NULL,NULL); 1908 } 1909 1910 /* 1911 * Taint values can only be increased 1912 * This means we can safely use a temporary. 1913 */ 1914 static int proc_taint(struct ctl_table *table, int write, 1915 void __user *buffer, size_t *lenp, loff_t *ppos) 1916 { 1917 struct ctl_table t; 1918 unsigned long tmptaint = get_taint(); 1919 int err; 1920 1921 if (write && !capable(CAP_SYS_ADMIN)) 1922 return -EPERM; 1923 1924 t = *table; 1925 t.data = &tmptaint; 1926 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 1927 if (err < 0) 1928 return err; 1929 1930 if (write) { 1931 /* 1932 * Poor man's atomic or. Not worth adding a primitive 1933 * to everyone's atomic.h for this 1934 */ 1935 int i; 1936 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 1937 if ((tmptaint >> i) & 1) 1938 add_taint(i); 1939 } 1940 } 1941 1942 return err; 1943 } 1944 1945 #ifdef CONFIG_PRINTK 1946 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 1947 void __user *buffer, size_t *lenp, loff_t *ppos) 1948 { 1949 if (write && !capable(CAP_SYS_ADMIN)) 1950 return -EPERM; 1951 1952 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 1953 } 1954 #endif 1955 1956 struct do_proc_dointvec_minmax_conv_param { 1957 int *min; 1958 int *max; 1959 }; 1960 1961 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 1962 int *valp, 1963 int write, void *data) 1964 { 1965 struct do_proc_dointvec_minmax_conv_param *param = data; 1966 if (write) { 1967 int val = *negp ? -*lvalp : *lvalp; 1968 if ((param->min && *param->min > val) || 1969 (param->max && *param->max < val)) 1970 return -EINVAL; 1971 *valp = val; 1972 } else { 1973 int val = *valp; 1974 if (val < 0) { 1975 *negp = true; 1976 *lvalp = (unsigned long)-val; 1977 } else { 1978 *negp = false; 1979 *lvalp = (unsigned long)val; 1980 } 1981 } 1982 return 0; 1983 } 1984 1985 /** 1986 * proc_dointvec_minmax - read a vector of integers with min/max values 1987 * @table: the sysctl table 1988 * @write: %TRUE if this is a write to the sysctl file 1989 * @buffer: the user buffer 1990 * @lenp: the size of the user buffer 1991 * @ppos: file position 1992 * 1993 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1994 * values from/to the user buffer, treated as an ASCII string. 1995 * 1996 * This routine will ensure the values are within the range specified by 1997 * table->extra1 (min) and table->extra2 (max). 1998 * 1999 * Returns 0 on success. 2000 */ 2001 int proc_dointvec_minmax(struct ctl_table *table, int write, 2002 void __user *buffer, size_t *lenp, loff_t *ppos) 2003 { 2004 struct do_proc_dointvec_minmax_conv_param param = { 2005 .min = (int *) table->extra1, 2006 .max = (int *) table->extra2, 2007 }; 2008 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2009 do_proc_dointvec_minmax_conv, ¶m); 2010 } 2011 2012 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2013 void __user *buffer, 2014 size_t *lenp, loff_t *ppos, 2015 unsigned long convmul, 2016 unsigned long convdiv) 2017 { 2018 unsigned long *i, *min, *max; 2019 int vleft, first = 1, err = 0; 2020 unsigned long page = 0; 2021 size_t left; 2022 char *kbuf; 2023 2024 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2025 *lenp = 0; 2026 return 0; 2027 } 2028 2029 i = (unsigned long *) data; 2030 min = (unsigned long *) table->extra1; 2031 max = (unsigned long *) table->extra2; 2032 vleft = table->maxlen / sizeof(unsigned long); 2033 left = *lenp; 2034 2035 if (write) { 2036 if (left > PAGE_SIZE - 1) 2037 left = PAGE_SIZE - 1; 2038 page = __get_free_page(GFP_TEMPORARY); 2039 kbuf = (char *) page; 2040 if (!kbuf) 2041 return -ENOMEM; 2042 if (copy_from_user(kbuf, buffer, left)) { 2043 err = -EFAULT; 2044 goto free; 2045 } 2046 kbuf[left] = 0; 2047 } 2048 2049 for (; left && vleft--; i++, first = 0) { 2050 unsigned long val; 2051 2052 if (write) { 2053 bool neg; 2054 2055 left -= proc_skip_spaces(&kbuf); 2056 2057 err = proc_get_long(&kbuf, &left, &val, &neg, 2058 proc_wspace_sep, 2059 sizeof(proc_wspace_sep), NULL); 2060 if (err) 2061 break; 2062 if (neg) 2063 continue; 2064 if ((min && val < *min) || (max && val > *max)) 2065 continue; 2066 *i = val; 2067 } else { 2068 val = convdiv * (*i) / convmul; 2069 if (!first) 2070 err = proc_put_char(&buffer, &left, '\t'); 2071 err = proc_put_long(&buffer, &left, val, false); 2072 if (err) 2073 break; 2074 } 2075 } 2076 2077 if (!write && !first && left && !err) 2078 err = proc_put_char(&buffer, &left, '\n'); 2079 if (write && !err) 2080 left -= proc_skip_spaces(&kbuf); 2081 free: 2082 if (write) { 2083 free_page(page); 2084 if (first) 2085 return err ? : -EINVAL; 2086 } 2087 *lenp -= left; 2088 *ppos += *lenp; 2089 return err; 2090 } 2091 2092 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2093 void __user *buffer, 2094 size_t *lenp, loff_t *ppos, 2095 unsigned long convmul, 2096 unsigned long convdiv) 2097 { 2098 return __do_proc_doulongvec_minmax(table->data, table, write, 2099 buffer, lenp, ppos, convmul, convdiv); 2100 } 2101 2102 /** 2103 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2104 * @table: the sysctl table 2105 * @write: %TRUE if this is a write to the sysctl file 2106 * @buffer: the user buffer 2107 * @lenp: the size of the user buffer 2108 * @ppos: file position 2109 * 2110 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2111 * values from/to the user buffer, treated as an ASCII string. 2112 * 2113 * This routine will ensure the values are within the range specified by 2114 * table->extra1 (min) and table->extra2 (max). 2115 * 2116 * Returns 0 on success. 2117 */ 2118 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2119 void __user *buffer, size_t *lenp, loff_t *ppos) 2120 { 2121 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2122 } 2123 2124 /** 2125 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2126 * @table: the sysctl table 2127 * @write: %TRUE if this is a write to the sysctl file 2128 * @buffer: the user buffer 2129 * @lenp: the size of the user buffer 2130 * @ppos: file position 2131 * 2132 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2133 * values from/to the user buffer, treated as an ASCII string. The values 2134 * are treated as milliseconds, and converted to jiffies when they are stored. 2135 * 2136 * This routine will ensure the values are within the range specified by 2137 * table->extra1 (min) and table->extra2 (max). 2138 * 2139 * Returns 0 on success. 2140 */ 2141 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2142 void __user *buffer, 2143 size_t *lenp, loff_t *ppos) 2144 { 2145 return do_proc_doulongvec_minmax(table, write, buffer, 2146 lenp, ppos, HZ, 1000l); 2147 } 2148 2149 2150 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2151 int *valp, 2152 int write, void *data) 2153 { 2154 if (write) { 2155 if (*lvalp > LONG_MAX / HZ) 2156 return 1; 2157 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2158 } else { 2159 int val = *valp; 2160 unsigned long lval; 2161 if (val < 0) { 2162 *negp = true; 2163 lval = (unsigned long)-val; 2164 } else { 2165 *negp = false; 2166 lval = (unsigned long)val; 2167 } 2168 *lvalp = lval / HZ; 2169 } 2170 return 0; 2171 } 2172 2173 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2174 int *valp, 2175 int write, void *data) 2176 { 2177 if (write) { 2178 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2179 return 1; 2180 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2181 } else { 2182 int val = *valp; 2183 unsigned long lval; 2184 if (val < 0) { 2185 *negp = true; 2186 lval = (unsigned long)-val; 2187 } else { 2188 *negp = false; 2189 lval = (unsigned long)val; 2190 } 2191 *lvalp = jiffies_to_clock_t(lval); 2192 } 2193 return 0; 2194 } 2195 2196 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2197 int *valp, 2198 int write, void *data) 2199 { 2200 if (write) { 2201 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2202 } else { 2203 int val = *valp; 2204 unsigned long lval; 2205 if (val < 0) { 2206 *negp = true; 2207 lval = (unsigned long)-val; 2208 } else { 2209 *negp = false; 2210 lval = (unsigned long)val; 2211 } 2212 *lvalp = jiffies_to_msecs(lval); 2213 } 2214 return 0; 2215 } 2216 2217 /** 2218 * proc_dointvec_jiffies - read a vector of integers as seconds 2219 * @table: the sysctl table 2220 * @write: %TRUE if this is a write to the sysctl file 2221 * @buffer: the user buffer 2222 * @lenp: the size of the user buffer 2223 * @ppos: file position 2224 * 2225 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2226 * values from/to the user buffer, treated as an ASCII string. 2227 * The values read are assumed to be in seconds, and are converted into 2228 * jiffies. 2229 * 2230 * Returns 0 on success. 2231 */ 2232 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2233 void __user *buffer, size_t *lenp, loff_t *ppos) 2234 { 2235 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2236 do_proc_dointvec_jiffies_conv,NULL); 2237 } 2238 2239 /** 2240 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2241 * @table: the sysctl table 2242 * @write: %TRUE if this is a write to the sysctl file 2243 * @buffer: the user buffer 2244 * @lenp: the size of the user buffer 2245 * @ppos: pointer to the file position 2246 * 2247 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2248 * values from/to the user buffer, treated as an ASCII string. 2249 * The values read are assumed to be in 1/USER_HZ seconds, and 2250 * are converted into jiffies. 2251 * 2252 * Returns 0 on success. 2253 */ 2254 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2255 void __user *buffer, size_t *lenp, loff_t *ppos) 2256 { 2257 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2258 do_proc_dointvec_userhz_jiffies_conv,NULL); 2259 } 2260 2261 /** 2262 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2263 * @table: the sysctl table 2264 * @write: %TRUE if this is a write to the sysctl file 2265 * @buffer: the user buffer 2266 * @lenp: the size of the user buffer 2267 * @ppos: file position 2268 * @ppos: the current position in the file 2269 * 2270 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2271 * values from/to the user buffer, treated as an ASCII string. 2272 * The values read are assumed to be in 1/1000 seconds, and 2273 * are converted into jiffies. 2274 * 2275 * Returns 0 on success. 2276 */ 2277 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2278 void __user *buffer, size_t *lenp, loff_t *ppos) 2279 { 2280 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2281 do_proc_dointvec_ms_jiffies_conv, NULL); 2282 } 2283 2284 static int proc_do_cad_pid(struct ctl_table *table, int write, 2285 void __user *buffer, size_t *lenp, loff_t *ppos) 2286 { 2287 struct pid *new_pid; 2288 pid_t tmp; 2289 int r; 2290 2291 tmp = pid_vnr(cad_pid); 2292 2293 r = __do_proc_dointvec(&tmp, table, write, buffer, 2294 lenp, ppos, NULL, NULL); 2295 if (r || !write) 2296 return r; 2297 2298 new_pid = find_get_pid(tmp); 2299 if (!new_pid) 2300 return -ESRCH; 2301 2302 put_pid(xchg(&cad_pid, new_pid)); 2303 return 0; 2304 } 2305 2306 /** 2307 * proc_do_large_bitmap - read/write from/to a large bitmap 2308 * @table: the sysctl table 2309 * @write: %TRUE if this is a write to the sysctl file 2310 * @buffer: the user buffer 2311 * @lenp: the size of the user buffer 2312 * @ppos: file position 2313 * 2314 * The bitmap is stored at table->data and the bitmap length (in bits) 2315 * in table->maxlen. 2316 * 2317 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2318 * large bitmaps may be represented in a compact manner. Writing into 2319 * the file will clear the bitmap then update it with the given input. 2320 * 2321 * Returns 0 on success. 2322 */ 2323 int proc_do_large_bitmap(struct ctl_table *table, int write, 2324 void __user *buffer, size_t *lenp, loff_t *ppos) 2325 { 2326 int err = 0; 2327 bool first = 1; 2328 size_t left = *lenp; 2329 unsigned long bitmap_len = table->maxlen; 2330 unsigned long *bitmap = (unsigned long *) table->data; 2331 unsigned long *tmp_bitmap = NULL; 2332 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2333 2334 if (!bitmap_len || !left || (*ppos && !write)) { 2335 *lenp = 0; 2336 return 0; 2337 } 2338 2339 if (write) { 2340 unsigned long page = 0; 2341 char *kbuf; 2342 2343 if (left > PAGE_SIZE - 1) 2344 left = PAGE_SIZE - 1; 2345 2346 page = __get_free_page(GFP_TEMPORARY); 2347 kbuf = (char *) page; 2348 if (!kbuf) 2349 return -ENOMEM; 2350 if (copy_from_user(kbuf, buffer, left)) { 2351 free_page(page); 2352 return -EFAULT; 2353 } 2354 kbuf[left] = 0; 2355 2356 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2357 GFP_KERNEL); 2358 if (!tmp_bitmap) { 2359 free_page(page); 2360 return -ENOMEM; 2361 } 2362 proc_skip_char(&kbuf, &left, '\n'); 2363 while (!err && left) { 2364 unsigned long val_a, val_b; 2365 bool neg; 2366 2367 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2368 sizeof(tr_a), &c); 2369 if (err) 2370 break; 2371 if (val_a >= bitmap_len || neg) { 2372 err = -EINVAL; 2373 break; 2374 } 2375 2376 val_b = val_a; 2377 if (left) { 2378 kbuf++; 2379 left--; 2380 } 2381 2382 if (c == '-') { 2383 err = proc_get_long(&kbuf, &left, &val_b, 2384 &neg, tr_b, sizeof(tr_b), 2385 &c); 2386 if (err) 2387 break; 2388 if (val_b >= bitmap_len || neg || 2389 val_a > val_b) { 2390 err = -EINVAL; 2391 break; 2392 } 2393 if (left) { 2394 kbuf++; 2395 left--; 2396 } 2397 } 2398 2399 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2400 first = 0; 2401 proc_skip_char(&kbuf, &left, '\n'); 2402 } 2403 free_page(page); 2404 } else { 2405 unsigned long bit_a, bit_b = 0; 2406 2407 while (left) { 2408 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2409 if (bit_a >= bitmap_len) 2410 break; 2411 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2412 bit_a + 1) - 1; 2413 2414 if (!first) { 2415 err = proc_put_char(&buffer, &left, ','); 2416 if (err) 2417 break; 2418 } 2419 err = proc_put_long(&buffer, &left, bit_a, false); 2420 if (err) 2421 break; 2422 if (bit_a != bit_b) { 2423 err = proc_put_char(&buffer, &left, '-'); 2424 if (err) 2425 break; 2426 err = proc_put_long(&buffer, &left, bit_b, false); 2427 if (err) 2428 break; 2429 } 2430 2431 first = 0; bit_b++; 2432 } 2433 if (!err) 2434 err = proc_put_char(&buffer, &left, '\n'); 2435 } 2436 2437 if (!err) { 2438 if (write) { 2439 if (*ppos) 2440 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2441 else 2442 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 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