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/kmemleak.h> 34 #include <linux/fs.h> 35 #include <linux/init.h> 36 #include <linux/kernel.h> 37 #include <linux/kobject.h> 38 #include <linux/net.h> 39 #include <linux/sysrq.h> 40 #include <linux/highuid.h> 41 #include <linux/writeback.h> 42 #include <linux/ratelimit.h> 43 #include <linux/compaction.h> 44 #include <linux/hugetlb.h> 45 #include <linux/initrd.h> 46 #include <linux/key.h> 47 #include <linux/times.h> 48 #include <linux/limits.h> 49 #include <linux/dcache.h> 50 #include <linux/dnotify.h> 51 #include <linux/syscalls.h> 52 #include <linux/vmstat.h> 53 #include <linux/nfs_fs.h> 54 #include <linux/acpi.h> 55 #include <linux/reboot.h> 56 #include <linux/ftrace.h> 57 #include <linux/perf_event.h> 58 #include <linux/kprobes.h> 59 #include <linux/pipe_fs_i.h> 60 #include <linux/oom.h> 61 #include <linux/kmod.h> 62 #include <linux/capability.h> 63 #include <linux/binfmts.h> 64 65 #include <asm/uaccess.h> 66 #include <asm/processor.h> 67 68 #ifdef CONFIG_X86 69 #include <asm/nmi.h> 70 #include <asm/stacktrace.h> 71 #include <asm/io.h> 72 #endif 73 #ifdef CONFIG_SPARC 74 #include <asm/setup.h> 75 #endif 76 #ifdef CONFIG_BSD_PROCESS_ACCT 77 #include <linux/acct.h> 78 #endif 79 #ifdef CONFIG_RT_MUTEXES 80 #include <linux/rtmutex.h> 81 #endif 82 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 83 #include <linux/lockdep.h> 84 #endif 85 #ifdef CONFIG_CHR_DEV_SG 86 #include <scsi/sg.h> 87 #endif 88 89 #ifdef CONFIG_LOCKUP_DETECTOR 90 #include <linux/nmi.h> 91 #endif 92 93 94 #if defined(CONFIG_SYSCTL) 95 96 /* External variables not in a header file. */ 97 extern int sysctl_overcommit_memory; 98 extern int sysctl_overcommit_ratio; 99 extern int max_threads; 100 extern int core_uses_pid; 101 extern int suid_dumpable; 102 extern char core_pattern[]; 103 extern unsigned int core_pipe_limit; 104 extern int pid_max; 105 extern int min_free_kbytes; 106 extern int pid_max_min, pid_max_max; 107 extern int sysctl_drop_caches; 108 extern int percpu_pagelist_fraction; 109 extern int compat_log; 110 extern int latencytop_enabled; 111 extern int sysctl_nr_open_min, sysctl_nr_open_max; 112 #ifndef CONFIG_MMU 113 extern int sysctl_nr_trim_pages; 114 #endif 115 #ifdef CONFIG_BLOCK 116 extern int blk_iopoll_enabled; 117 #endif 118 119 /* Constants used for minimum and maximum */ 120 #ifdef CONFIG_LOCKUP_DETECTOR 121 static int sixty = 60; 122 static int neg_one = -1; 123 #endif 124 125 static int zero; 126 static int __maybe_unused one = 1; 127 static int __maybe_unused two = 2; 128 static int __maybe_unused three = 3; 129 static unsigned long one_ul = 1; 130 static int one_hundred = 100; 131 #ifdef CONFIG_PRINTK 132 static int ten_thousand = 10000; 133 #endif 134 135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 136 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 137 138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 139 static int maxolduid = 65535; 140 static int minolduid; 141 static int min_percpu_pagelist_fract = 8; 142 143 static int ngroups_max = NGROUPS_MAX; 144 static const int cap_last_cap = CAP_LAST_CAP; 145 146 #ifdef CONFIG_INOTIFY_USER 147 #include <linux/inotify.h> 148 #endif 149 #ifdef CONFIG_SPARC 150 #endif 151 152 #ifdef CONFIG_SPARC64 153 extern int sysctl_tsb_ratio; 154 #endif 155 156 #ifdef __hppa__ 157 extern int pwrsw_enabled; 158 extern int unaligned_enabled; 159 #endif 160 161 #ifdef CONFIG_IA64 162 extern int no_unaligned_warning; 163 extern int unaligned_dump_stack; 164 #endif 165 166 #ifdef CONFIG_PROC_SYSCTL 167 static int proc_do_cad_pid(struct ctl_table *table, int write, 168 void __user *buffer, size_t *lenp, loff_t *ppos); 169 static int proc_taint(struct ctl_table *table, int write, 170 void __user *buffer, size_t *lenp, loff_t *ppos); 171 #endif 172 173 #ifdef CONFIG_PRINTK 174 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 175 void __user *buffer, size_t *lenp, loff_t *ppos); 176 #endif 177 178 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 179 void __user *buffer, size_t *lenp, loff_t *ppos); 180 static int proc_dostring_coredump(struct ctl_table *table, int write, 181 void __user *buffer, size_t *lenp, loff_t *ppos); 182 183 #ifdef CONFIG_MAGIC_SYSRQ 184 /* Note: sysrq code uses it's own private copy */ 185 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 186 187 static int sysrq_sysctl_handler(ctl_table *table, int write, 188 void __user *buffer, size_t *lenp, 189 loff_t *ppos) 190 { 191 int error; 192 193 error = proc_dointvec(table, write, buffer, lenp, ppos); 194 if (error) 195 return error; 196 197 if (write) 198 sysrq_toggle_support(__sysrq_enabled); 199 200 return 0; 201 } 202 203 #endif 204 205 static struct ctl_table kern_table[]; 206 static struct ctl_table vm_table[]; 207 static struct ctl_table fs_table[]; 208 static struct ctl_table debug_table[]; 209 static struct ctl_table dev_table[]; 210 extern struct ctl_table random_table[]; 211 #ifdef CONFIG_EPOLL 212 extern struct ctl_table epoll_table[]; 213 #endif 214 215 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 216 int sysctl_legacy_va_layout; 217 #endif 218 219 /* The default sysctl tables: */ 220 221 static struct ctl_table sysctl_base_table[] = { 222 { 223 .procname = "kernel", 224 .mode = 0555, 225 .child = kern_table, 226 }, 227 { 228 .procname = "vm", 229 .mode = 0555, 230 .child = vm_table, 231 }, 232 { 233 .procname = "fs", 234 .mode = 0555, 235 .child = fs_table, 236 }, 237 { 238 .procname = "debug", 239 .mode = 0555, 240 .child = debug_table, 241 }, 242 { 243 .procname = "dev", 244 .mode = 0555, 245 .child = dev_table, 246 }, 247 { } 248 }; 249 250 #ifdef CONFIG_SCHED_DEBUG 251 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 252 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 253 static int min_wakeup_granularity_ns; /* 0 usecs */ 254 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 255 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 256 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 257 #endif 258 259 #ifdef CONFIG_COMPACTION 260 static int min_extfrag_threshold; 261 static int max_extfrag_threshold = 1000; 262 #endif 263 264 static struct ctl_table kern_table[] = { 265 { 266 .procname = "sched_child_runs_first", 267 .data = &sysctl_sched_child_runs_first, 268 .maxlen = sizeof(unsigned int), 269 .mode = 0644, 270 .proc_handler = proc_dointvec, 271 }, 272 #ifdef CONFIG_SCHED_DEBUG 273 { 274 .procname = "sched_min_granularity_ns", 275 .data = &sysctl_sched_min_granularity, 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_latency_ns", 284 .data = &sysctl_sched_latency, 285 .maxlen = sizeof(unsigned int), 286 .mode = 0644, 287 .proc_handler = sched_proc_update_handler, 288 .extra1 = &min_sched_granularity_ns, 289 .extra2 = &max_sched_granularity_ns, 290 }, 291 { 292 .procname = "sched_wakeup_granularity_ns", 293 .data = &sysctl_sched_wakeup_granularity, 294 .maxlen = sizeof(unsigned int), 295 .mode = 0644, 296 .proc_handler = sched_proc_update_handler, 297 .extra1 = &min_wakeup_granularity_ns, 298 .extra2 = &max_wakeup_granularity_ns, 299 }, 300 { 301 .procname = "sched_tunable_scaling", 302 .data = &sysctl_sched_tunable_scaling, 303 .maxlen = sizeof(enum sched_tunable_scaling), 304 .mode = 0644, 305 .proc_handler = sched_proc_update_handler, 306 .extra1 = &min_sched_tunable_scaling, 307 .extra2 = &max_sched_tunable_scaling, 308 }, 309 { 310 .procname = "sched_migration_cost", 311 .data = &sysctl_sched_migration_cost, 312 .maxlen = sizeof(unsigned int), 313 .mode = 0644, 314 .proc_handler = proc_dointvec, 315 }, 316 { 317 .procname = "sched_nr_migrate", 318 .data = &sysctl_sched_nr_migrate, 319 .maxlen = sizeof(unsigned int), 320 .mode = 0644, 321 .proc_handler = proc_dointvec, 322 }, 323 { 324 .procname = "sched_time_avg", 325 .data = &sysctl_sched_time_avg, 326 .maxlen = sizeof(unsigned int), 327 .mode = 0644, 328 .proc_handler = proc_dointvec, 329 }, 330 { 331 .procname = "sched_shares_window", 332 .data = &sysctl_sched_shares_window, 333 .maxlen = sizeof(unsigned int), 334 .mode = 0644, 335 .proc_handler = proc_dointvec, 336 }, 337 { 338 .procname = "timer_migration", 339 .data = &sysctl_timer_migration, 340 .maxlen = sizeof(unsigned int), 341 .mode = 0644, 342 .proc_handler = proc_dointvec_minmax, 343 .extra1 = &zero, 344 .extra2 = &one, 345 }, 346 #endif 347 { 348 .procname = "sched_rt_period_us", 349 .data = &sysctl_sched_rt_period, 350 .maxlen = sizeof(unsigned int), 351 .mode = 0644, 352 .proc_handler = sched_rt_handler, 353 }, 354 { 355 .procname = "sched_rt_runtime_us", 356 .data = &sysctl_sched_rt_runtime, 357 .maxlen = sizeof(int), 358 .mode = 0644, 359 .proc_handler = sched_rt_handler, 360 }, 361 #ifdef CONFIG_SCHED_AUTOGROUP 362 { 363 .procname = "sched_autogroup_enabled", 364 .data = &sysctl_sched_autogroup_enabled, 365 .maxlen = sizeof(unsigned int), 366 .mode = 0644, 367 .proc_handler = proc_dointvec_minmax, 368 .extra1 = &zero, 369 .extra2 = &one, 370 }, 371 #endif 372 #ifdef CONFIG_CFS_BANDWIDTH 373 { 374 .procname = "sched_cfs_bandwidth_slice_us", 375 .data = &sysctl_sched_cfs_bandwidth_slice, 376 .maxlen = sizeof(unsigned int), 377 .mode = 0644, 378 .proc_handler = proc_dointvec_minmax, 379 .extra1 = &one, 380 }, 381 #endif 382 #ifdef CONFIG_PROVE_LOCKING 383 { 384 .procname = "prove_locking", 385 .data = &prove_locking, 386 .maxlen = sizeof(int), 387 .mode = 0644, 388 .proc_handler = proc_dointvec, 389 }, 390 #endif 391 #ifdef CONFIG_LOCK_STAT 392 { 393 .procname = "lock_stat", 394 .data = &lock_stat, 395 .maxlen = sizeof(int), 396 .mode = 0644, 397 .proc_handler = proc_dointvec, 398 }, 399 #endif 400 { 401 .procname = "panic", 402 .data = &panic_timeout, 403 .maxlen = sizeof(int), 404 .mode = 0644, 405 .proc_handler = proc_dointvec, 406 }, 407 { 408 .procname = "core_uses_pid", 409 .data = &core_uses_pid, 410 .maxlen = sizeof(int), 411 .mode = 0644, 412 .proc_handler = proc_dointvec, 413 }, 414 { 415 .procname = "core_pattern", 416 .data = core_pattern, 417 .maxlen = CORENAME_MAX_SIZE, 418 .mode = 0644, 419 .proc_handler = proc_dostring_coredump, 420 }, 421 { 422 .procname = "core_pipe_limit", 423 .data = &core_pipe_limit, 424 .maxlen = sizeof(unsigned int), 425 .mode = 0644, 426 .proc_handler = proc_dointvec, 427 }, 428 #ifdef CONFIG_PROC_SYSCTL 429 { 430 .procname = "tainted", 431 .maxlen = sizeof(long), 432 .mode = 0644, 433 .proc_handler = proc_taint, 434 }, 435 #endif 436 #ifdef CONFIG_LATENCYTOP 437 { 438 .procname = "latencytop", 439 .data = &latencytop_enabled, 440 .maxlen = sizeof(int), 441 .mode = 0644, 442 .proc_handler = proc_dointvec, 443 }, 444 #endif 445 #ifdef CONFIG_BLK_DEV_INITRD 446 { 447 .procname = "real-root-dev", 448 .data = &real_root_dev, 449 .maxlen = sizeof(int), 450 .mode = 0644, 451 .proc_handler = proc_dointvec, 452 }, 453 #endif 454 { 455 .procname = "print-fatal-signals", 456 .data = &print_fatal_signals, 457 .maxlen = sizeof(int), 458 .mode = 0644, 459 .proc_handler = proc_dointvec, 460 }, 461 #ifdef CONFIG_SPARC 462 { 463 .procname = "reboot-cmd", 464 .data = reboot_command, 465 .maxlen = 256, 466 .mode = 0644, 467 .proc_handler = proc_dostring, 468 }, 469 { 470 .procname = "stop-a", 471 .data = &stop_a_enabled, 472 .maxlen = sizeof (int), 473 .mode = 0644, 474 .proc_handler = proc_dointvec, 475 }, 476 { 477 .procname = "scons-poweroff", 478 .data = &scons_pwroff, 479 .maxlen = sizeof (int), 480 .mode = 0644, 481 .proc_handler = proc_dointvec, 482 }, 483 #endif 484 #ifdef CONFIG_SPARC64 485 { 486 .procname = "tsb-ratio", 487 .data = &sysctl_tsb_ratio, 488 .maxlen = sizeof (int), 489 .mode = 0644, 490 .proc_handler = proc_dointvec, 491 }, 492 #endif 493 #ifdef __hppa__ 494 { 495 .procname = "soft-power", 496 .data = &pwrsw_enabled, 497 .maxlen = sizeof (int), 498 .mode = 0644, 499 .proc_handler = proc_dointvec, 500 }, 501 { 502 .procname = "unaligned-trap", 503 .data = &unaligned_enabled, 504 .maxlen = sizeof (int), 505 .mode = 0644, 506 .proc_handler = proc_dointvec, 507 }, 508 #endif 509 { 510 .procname = "ctrl-alt-del", 511 .data = &C_A_D, 512 .maxlen = sizeof(int), 513 .mode = 0644, 514 .proc_handler = proc_dointvec, 515 }, 516 #ifdef CONFIG_FUNCTION_TRACER 517 { 518 .procname = "ftrace_enabled", 519 .data = &ftrace_enabled, 520 .maxlen = sizeof(int), 521 .mode = 0644, 522 .proc_handler = ftrace_enable_sysctl, 523 }, 524 #endif 525 #ifdef CONFIG_STACK_TRACER 526 { 527 .procname = "stack_tracer_enabled", 528 .data = &stack_tracer_enabled, 529 .maxlen = sizeof(int), 530 .mode = 0644, 531 .proc_handler = stack_trace_sysctl, 532 }, 533 #endif 534 #ifdef CONFIG_TRACING 535 { 536 .procname = "ftrace_dump_on_oops", 537 .data = &ftrace_dump_on_oops, 538 .maxlen = sizeof(int), 539 .mode = 0644, 540 .proc_handler = proc_dointvec, 541 }, 542 #endif 543 #ifdef CONFIG_MODULES 544 { 545 .procname = "modprobe", 546 .data = &modprobe_path, 547 .maxlen = KMOD_PATH_LEN, 548 .mode = 0644, 549 .proc_handler = proc_dostring, 550 }, 551 { 552 .procname = "modules_disabled", 553 .data = &modules_disabled, 554 .maxlen = sizeof(int), 555 .mode = 0644, 556 /* only handle a transition from default "0" to "1" */ 557 .proc_handler = proc_dointvec_minmax, 558 .extra1 = &one, 559 .extra2 = &one, 560 }, 561 #endif 562 #ifdef CONFIG_HOTPLUG 563 { 564 .procname = "hotplug", 565 .data = &uevent_helper, 566 .maxlen = UEVENT_HELPER_PATH_LEN, 567 .mode = 0644, 568 .proc_handler = proc_dostring, 569 }, 570 #endif 571 #ifdef CONFIG_CHR_DEV_SG 572 { 573 .procname = "sg-big-buff", 574 .data = &sg_big_buff, 575 .maxlen = sizeof (int), 576 .mode = 0444, 577 .proc_handler = proc_dointvec, 578 }, 579 #endif 580 #ifdef CONFIG_BSD_PROCESS_ACCT 581 { 582 .procname = "acct", 583 .data = &acct_parm, 584 .maxlen = 3*sizeof(int), 585 .mode = 0644, 586 .proc_handler = proc_dointvec, 587 }, 588 #endif 589 #ifdef CONFIG_MAGIC_SYSRQ 590 { 591 .procname = "sysrq", 592 .data = &__sysrq_enabled, 593 .maxlen = sizeof (int), 594 .mode = 0644, 595 .proc_handler = sysrq_sysctl_handler, 596 }, 597 #endif 598 #ifdef CONFIG_PROC_SYSCTL 599 { 600 .procname = "cad_pid", 601 .data = NULL, 602 .maxlen = sizeof (int), 603 .mode = 0600, 604 .proc_handler = proc_do_cad_pid, 605 }, 606 #endif 607 { 608 .procname = "threads-max", 609 .data = &max_threads, 610 .maxlen = sizeof(int), 611 .mode = 0644, 612 .proc_handler = proc_dointvec, 613 }, 614 { 615 .procname = "random", 616 .mode = 0555, 617 .child = random_table, 618 }, 619 { 620 .procname = "usermodehelper", 621 .mode = 0555, 622 .child = usermodehelper_table, 623 }, 624 { 625 .procname = "overflowuid", 626 .data = &overflowuid, 627 .maxlen = sizeof(int), 628 .mode = 0644, 629 .proc_handler = proc_dointvec_minmax, 630 .extra1 = &minolduid, 631 .extra2 = &maxolduid, 632 }, 633 { 634 .procname = "overflowgid", 635 .data = &overflowgid, 636 .maxlen = sizeof(int), 637 .mode = 0644, 638 .proc_handler = proc_dointvec_minmax, 639 .extra1 = &minolduid, 640 .extra2 = &maxolduid, 641 }, 642 #ifdef CONFIG_S390 643 #ifdef CONFIG_MATHEMU 644 { 645 .procname = "ieee_emulation_warnings", 646 .data = &sysctl_ieee_emulation_warnings, 647 .maxlen = sizeof(int), 648 .mode = 0644, 649 .proc_handler = proc_dointvec, 650 }, 651 #endif 652 { 653 .procname = "userprocess_debug", 654 .data = &show_unhandled_signals, 655 .maxlen = sizeof(int), 656 .mode = 0644, 657 .proc_handler = proc_dointvec, 658 }, 659 #endif 660 { 661 .procname = "pid_max", 662 .data = &pid_max, 663 .maxlen = sizeof (int), 664 .mode = 0644, 665 .proc_handler = proc_dointvec_minmax, 666 .extra1 = &pid_max_min, 667 .extra2 = &pid_max_max, 668 }, 669 { 670 .procname = "panic_on_oops", 671 .data = &panic_on_oops, 672 .maxlen = sizeof(int), 673 .mode = 0644, 674 .proc_handler = proc_dointvec, 675 }, 676 #if defined CONFIG_PRINTK 677 { 678 .procname = "printk", 679 .data = &console_loglevel, 680 .maxlen = 4*sizeof(int), 681 .mode = 0644, 682 .proc_handler = proc_dointvec, 683 }, 684 { 685 .procname = "printk_ratelimit", 686 .data = &printk_ratelimit_state.interval, 687 .maxlen = sizeof(int), 688 .mode = 0644, 689 .proc_handler = proc_dointvec_jiffies, 690 }, 691 { 692 .procname = "printk_ratelimit_burst", 693 .data = &printk_ratelimit_state.burst, 694 .maxlen = sizeof(int), 695 .mode = 0644, 696 .proc_handler = proc_dointvec, 697 }, 698 { 699 .procname = "printk_delay", 700 .data = &printk_delay_msec, 701 .maxlen = sizeof(int), 702 .mode = 0644, 703 .proc_handler = proc_dointvec_minmax, 704 .extra1 = &zero, 705 .extra2 = &ten_thousand, 706 }, 707 { 708 .procname = "dmesg_restrict", 709 .data = &dmesg_restrict, 710 .maxlen = sizeof(int), 711 .mode = 0644, 712 .proc_handler = proc_dointvec_minmax_sysadmin, 713 .extra1 = &zero, 714 .extra2 = &one, 715 }, 716 { 717 .procname = "kptr_restrict", 718 .data = &kptr_restrict, 719 .maxlen = sizeof(int), 720 .mode = 0644, 721 .proc_handler = proc_dointvec_minmax_sysadmin, 722 .extra1 = &zero, 723 .extra2 = &two, 724 }, 725 #endif 726 { 727 .procname = "ngroups_max", 728 .data = &ngroups_max, 729 .maxlen = sizeof (int), 730 .mode = 0444, 731 .proc_handler = proc_dointvec, 732 }, 733 { 734 .procname = "cap_last_cap", 735 .data = (void *)&cap_last_cap, 736 .maxlen = sizeof(int), 737 .mode = 0444, 738 .proc_handler = proc_dointvec, 739 }, 740 #if defined(CONFIG_LOCKUP_DETECTOR) 741 { 742 .procname = "watchdog", 743 .data = &watchdog_enabled, 744 .maxlen = sizeof (int), 745 .mode = 0644, 746 .proc_handler = proc_dowatchdog, 747 .extra1 = &zero, 748 .extra2 = &one, 749 }, 750 { 751 .procname = "watchdog_thresh", 752 .data = &watchdog_thresh, 753 .maxlen = sizeof(int), 754 .mode = 0644, 755 .proc_handler = proc_dowatchdog, 756 .extra1 = &neg_one, 757 .extra2 = &sixty, 758 }, 759 { 760 .procname = "softlockup_panic", 761 .data = &softlockup_panic, 762 .maxlen = sizeof(int), 763 .mode = 0644, 764 .proc_handler = proc_dointvec_minmax, 765 .extra1 = &zero, 766 .extra2 = &one, 767 }, 768 { 769 .procname = "nmi_watchdog", 770 .data = &watchdog_enabled, 771 .maxlen = sizeof (int), 772 .mode = 0644, 773 .proc_handler = proc_dowatchdog, 774 .extra1 = &zero, 775 .extra2 = &one, 776 }, 777 #endif 778 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 779 { 780 .procname = "unknown_nmi_panic", 781 .data = &unknown_nmi_panic, 782 .maxlen = sizeof (int), 783 .mode = 0644, 784 .proc_handler = proc_dointvec, 785 }, 786 #endif 787 #if defined(CONFIG_X86) 788 { 789 .procname = "panic_on_unrecovered_nmi", 790 .data = &panic_on_unrecovered_nmi, 791 .maxlen = sizeof(int), 792 .mode = 0644, 793 .proc_handler = proc_dointvec, 794 }, 795 { 796 .procname = "panic_on_io_nmi", 797 .data = &panic_on_io_nmi, 798 .maxlen = sizeof(int), 799 .mode = 0644, 800 .proc_handler = proc_dointvec, 801 }, 802 #ifdef CONFIG_DEBUG_STACKOVERFLOW 803 { 804 .procname = "panic_on_stackoverflow", 805 .data = &sysctl_panic_on_stackoverflow, 806 .maxlen = sizeof(int), 807 .mode = 0644, 808 .proc_handler = proc_dointvec, 809 }, 810 #endif 811 { 812 .procname = "bootloader_type", 813 .data = &bootloader_type, 814 .maxlen = sizeof (int), 815 .mode = 0444, 816 .proc_handler = proc_dointvec, 817 }, 818 { 819 .procname = "bootloader_version", 820 .data = &bootloader_version, 821 .maxlen = sizeof (int), 822 .mode = 0444, 823 .proc_handler = proc_dointvec, 824 }, 825 { 826 .procname = "kstack_depth_to_print", 827 .data = &kstack_depth_to_print, 828 .maxlen = sizeof(int), 829 .mode = 0644, 830 .proc_handler = proc_dointvec, 831 }, 832 { 833 .procname = "io_delay_type", 834 .data = &io_delay_type, 835 .maxlen = sizeof(int), 836 .mode = 0644, 837 .proc_handler = proc_dointvec, 838 }, 839 #endif 840 #if defined(CONFIG_MMU) 841 { 842 .procname = "randomize_va_space", 843 .data = &randomize_va_space, 844 .maxlen = sizeof(int), 845 .mode = 0644, 846 .proc_handler = proc_dointvec, 847 }, 848 #endif 849 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 850 { 851 .procname = "spin_retry", 852 .data = &spin_retry, 853 .maxlen = sizeof (int), 854 .mode = 0644, 855 .proc_handler = proc_dointvec, 856 }, 857 #endif 858 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 859 { 860 .procname = "acpi_video_flags", 861 .data = &acpi_realmode_flags, 862 .maxlen = sizeof (unsigned long), 863 .mode = 0644, 864 .proc_handler = proc_doulongvec_minmax, 865 }, 866 #endif 867 #ifdef CONFIG_IA64 868 { 869 .procname = "ignore-unaligned-usertrap", 870 .data = &no_unaligned_warning, 871 .maxlen = sizeof (int), 872 .mode = 0644, 873 .proc_handler = proc_dointvec, 874 }, 875 { 876 .procname = "unaligned-dump-stack", 877 .data = &unaligned_dump_stack, 878 .maxlen = sizeof (int), 879 .mode = 0644, 880 .proc_handler = proc_dointvec, 881 }, 882 #endif 883 #ifdef CONFIG_DETECT_HUNG_TASK 884 { 885 .procname = "hung_task_panic", 886 .data = &sysctl_hung_task_panic, 887 .maxlen = sizeof(int), 888 .mode = 0644, 889 .proc_handler = proc_dointvec_minmax, 890 .extra1 = &zero, 891 .extra2 = &one, 892 }, 893 { 894 .procname = "hung_task_check_count", 895 .data = &sysctl_hung_task_check_count, 896 .maxlen = sizeof(unsigned long), 897 .mode = 0644, 898 .proc_handler = proc_doulongvec_minmax, 899 }, 900 { 901 .procname = "hung_task_timeout_secs", 902 .data = &sysctl_hung_task_timeout_secs, 903 .maxlen = sizeof(unsigned long), 904 .mode = 0644, 905 .proc_handler = proc_dohung_task_timeout_secs, 906 }, 907 { 908 .procname = "hung_task_warnings", 909 .data = &sysctl_hung_task_warnings, 910 .maxlen = sizeof(unsigned long), 911 .mode = 0644, 912 .proc_handler = proc_doulongvec_minmax, 913 }, 914 #endif 915 #ifdef CONFIG_COMPAT 916 { 917 .procname = "compat-log", 918 .data = &compat_log, 919 .maxlen = sizeof (int), 920 .mode = 0644, 921 .proc_handler = proc_dointvec, 922 }, 923 #endif 924 #ifdef CONFIG_RT_MUTEXES 925 { 926 .procname = "max_lock_depth", 927 .data = &max_lock_depth, 928 .maxlen = sizeof(int), 929 .mode = 0644, 930 .proc_handler = proc_dointvec, 931 }, 932 #endif 933 { 934 .procname = "poweroff_cmd", 935 .data = &poweroff_cmd, 936 .maxlen = POWEROFF_CMD_PATH_LEN, 937 .mode = 0644, 938 .proc_handler = proc_dostring, 939 }, 940 #ifdef CONFIG_KEYS 941 { 942 .procname = "keys", 943 .mode = 0555, 944 .child = key_sysctls, 945 }, 946 #endif 947 #ifdef CONFIG_RCU_TORTURE_TEST 948 { 949 .procname = "rcutorture_runnable", 950 .data = &rcutorture_runnable, 951 .maxlen = sizeof(int), 952 .mode = 0644, 953 .proc_handler = proc_dointvec, 954 }, 955 #endif 956 #ifdef CONFIG_PERF_EVENTS 957 /* 958 * User-space scripts rely on the existence of this file 959 * as a feature check for perf_events being enabled. 960 * 961 * So it's an ABI, do not remove! 962 */ 963 { 964 .procname = "perf_event_paranoid", 965 .data = &sysctl_perf_event_paranoid, 966 .maxlen = sizeof(sysctl_perf_event_paranoid), 967 .mode = 0644, 968 .proc_handler = proc_dointvec, 969 }, 970 { 971 .procname = "perf_event_mlock_kb", 972 .data = &sysctl_perf_event_mlock, 973 .maxlen = sizeof(sysctl_perf_event_mlock), 974 .mode = 0644, 975 .proc_handler = proc_dointvec, 976 }, 977 { 978 .procname = "perf_event_max_sample_rate", 979 .data = &sysctl_perf_event_sample_rate, 980 .maxlen = sizeof(sysctl_perf_event_sample_rate), 981 .mode = 0644, 982 .proc_handler = perf_proc_update_handler, 983 }, 984 #endif 985 #ifdef CONFIG_KMEMCHECK 986 { 987 .procname = "kmemcheck", 988 .data = &kmemcheck_enabled, 989 .maxlen = sizeof(int), 990 .mode = 0644, 991 .proc_handler = proc_dointvec, 992 }, 993 #endif 994 #ifdef CONFIG_BLOCK 995 { 996 .procname = "blk_iopoll", 997 .data = &blk_iopoll_enabled, 998 .maxlen = sizeof(int), 999 .mode = 0644, 1000 .proc_handler = proc_dointvec, 1001 }, 1002 #endif 1003 { } 1004 }; 1005 1006 static struct ctl_table vm_table[] = { 1007 { 1008 .procname = "overcommit_memory", 1009 .data = &sysctl_overcommit_memory, 1010 .maxlen = sizeof(sysctl_overcommit_memory), 1011 .mode = 0644, 1012 .proc_handler = proc_dointvec_minmax, 1013 .extra1 = &zero, 1014 .extra2 = &two, 1015 }, 1016 { 1017 .procname = "panic_on_oom", 1018 .data = &sysctl_panic_on_oom, 1019 .maxlen = sizeof(sysctl_panic_on_oom), 1020 .mode = 0644, 1021 .proc_handler = proc_dointvec_minmax, 1022 .extra1 = &zero, 1023 .extra2 = &two, 1024 }, 1025 { 1026 .procname = "oom_kill_allocating_task", 1027 .data = &sysctl_oom_kill_allocating_task, 1028 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1029 .mode = 0644, 1030 .proc_handler = proc_dointvec, 1031 }, 1032 { 1033 .procname = "oom_dump_tasks", 1034 .data = &sysctl_oom_dump_tasks, 1035 .maxlen = sizeof(sysctl_oom_dump_tasks), 1036 .mode = 0644, 1037 .proc_handler = proc_dointvec, 1038 }, 1039 { 1040 .procname = "overcommit_ratio", 1041 .data = &sysctl_overcommit_ratio, 1042 .maxlen = sizeof(sysctl_overcommit_ratio), 1043 .mode = 0644, 1044 .proc_handler = proc_dointvec, 1045 }, 1046 { 1047 .procname = "page-cluster", 1048 .data = &page_cluster, 1049 .maxlen = sizeof(int), 1050 .mode = 0644, 1051 .proc_handler = proc_dointvec_minmax, 1052 .extra1 = &zero, 1053 }, 1054 { 1055 .procname = "dirty_background_ratio", 1056 .data = &dirty_background_ratio, 1057 .maxlen = sizeof(dirty_background_ratio), 1058 .mode = 0644, 1059 .proc_handler = dirty_background_ratio_handler, 1060 .extra1 = &zero, 1061 .extra2 = &one_hundred, 1062 }, 1063 { 1064 .procname = "dirty_background_bytes", 1065 .data = &dirty_background_bytes, 1066 .maxlen = sizeof(dirty_background_bytes), 1067 .mode = 0644, 1068 .proc_handler = dirty_background_bytes_handler, 1069 .extra1 = &one_ul, 1070 }, 1071 { 1072 .procname = "dirty_ratio", 1073 .data = &vm_dirty_ratio, 1074 .maxlen = sizeof(vm_dirty_ratio), 1075 .mode = 0644, 1076 .proc_handler = dirty_ratio_handler, 1077 .extra1 = &zero, 1078 .extra2 = &one_hundred, 1079 }, 1080 { 1081 .procname = "dirty_bytes", 1082 .data = &vm_dirty_bytes, 1083 .maxlen = sizeof(vm_dirty_bytes), 1084 .mode = 0644, 1085 .proc_handler = dirty_bytes_handler, 1086 .extra1 = &dirty_bytes_min, 1087 }, 1088 { 1089 .procname = "dirty_writeback_centisecs", 1090 .data = &dirty_writeback_interval, 1091 .maxlen = sizeof(dirty_writeback_interval), 1092 .mode = 0644, 1093 .proc_handler = dirty_writeback_centisecs_handler, 1094 }, 1095 { 1096 .procname = "dirty_expire_centisecs", 1097 .data = &dirty_expire_interval, 1098 .maxlen = sizeof(dirty_expire_interval), 1099 .mode = 0644, 1100 .proc_handler = proc_dointvec_minmax, 1101 .extra1 = &zero, 1102 }, 1103 { 1104 .procname = "nr_pdflush_threads", 1105 .data = &nr_pdflush_threads, 1106 .maxlen = sizeof nr_pdflush_threads, 1107 .mode = 0444 /* read-only*/, 1108 .proc_handler = proc_dointvec, 1109 }, 1110 { 1111 .procname = "swappiness", 1112 .data = &vm_swappiness, 1113 .maxlen = sizeof(vm_swappiness), 1114 .mode = 0644, 1115 .proc_handler = proc_dointvec_minmax, 1116 .extra1 = &zero, 1117 .extra2 = &one_hundred, 1118 }, 1119 #ifdef CONFIG_HUGETLB_PAGE 1120 { 1121 .procname = "nr_hugepages", 1122 .data = NULL, 1123 .maxlen = sizeof(unsigned long), 1124 .mode = 0644, 1125 .proc_handler = hugetlb_sysctl_handler, 1126 .extra1 = (void *)&hugetlb_zero, 1127 .extra2 = (void *)&hugetlb_infinity, 1128 }, 1129 #ifdef CONFIG_NUMA 1130 { 1131 .procname = "nr_hugepages_mempolicy", 1132 .data = NULL, 1133 .maxlen = sizeof(unsigned long), 1134 .mode = 0644, 1135 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1136 .extra1 = (void *)&hugetlb_zero, 1137 .extra2 = (void *)&hugetlb_infinity, 1138 }, 1139 #endif 1140 { 1141 .procname = "hugetlb_shm_group", 1142 .data = &sysctl_hugetlb_shm_group, 1143 .maxlen = sizeof(gid_t), 1144 .mode = 0644, 1145 .proc_handler = proc_dointvec, 1146 }, 1147 { 1148 .procname = "hugepages_treat_as_movable", 1149 .data = &hugepages_treat_as_movable, 1150 .maxlen = sizeof(int), 1151 .mode = 0644, 1152 .proc_handler = hugetlb_treat_movable_handler, 1153 }, 1154 { 1155 .procname = "nr_overcommit_hugepages", 1156 .data = NULL, 1157 .maxlen = sizeof(unsigned long), 1158 .mode = 0644, 1159 .proc_handler = hugetlb_overcommit_handler, 1160 .extra1 = (void *)&hugetlb_zero, 1161 .extra2 = (void *)&hugetlb_infinity, 1162 }, 1163 #endif 1164 { 1165 .procname = "lowmem_reserve_ratio", 1166 .data = &sysctl_lowmem_reserve_ratio, 1167 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1168 .mode = 0644, 1169 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1170 }, 1171 { 1172 .procname = "drop_caches", 1173 .data = &sysctl_drop_caches, 1174 .maxlen = sizeof(int), 1175 .mode = 0644, 1176 .proc_handler = drop_caches_sysctl_handler, 1177 .extra1 = &one, 1178 .extra2 = &three, 1179 }, 1180 #ifdef CONFIG_COMPACTION 1181 { 1182 .procname = "compact_memory", 1183 .data = &sysctl_compact_memory, 1184 .maxlen = sizeof(int), 1185 .mode = 0200, 1186 .proc_handler = sysctl_compaction_handler, 1187 }, 1188 { 1189 .procname = "extfrag_threshold", 1190 .data = &sysctl_extfrag_threshold, 1191 .maxlen = sizeof(int), 1192 .mode = 0644, 1193 .proc_handler = sysctl_extfrag_handler, 1194 .extra1 = &min_extfrag_threshold, 1195 .extra2 = &max_extfrag_threshold, 1196 }, 1197 1198 #endif /* CONFIG_COMPACTION */ 1199 { 1200 .procname = "min_free_kbytes", 1201 .data = &min_free_kbytes, 1202 .maxlen = sizeof(min_free_kbytes), 1203 .mode = 0644, 1204 .proc_handler = min_free_kbytes_sysctl_handler, 1205 .extra1 = &zero, 1206 }, 1207 { 1208 .procname = "percpu_pagelist_fraction", 1209 .data = &percpu_pagelist_fraction, 1210 .maxlen = sizeof(percpu_pagelist_fraction), 1211 .mode = 0644, 1212 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1213 .extra1 = &min_percpu_pagelist_fract, 1214 }, 1215 #ifdef CONFIG_MMU 1216 { 1217 .procname = "max_map_count", 1218 .data = &sysctl_max_map_count, 1219 .maxlen = sizeof(sysctl_max_map_count), 1220 .mode = 0644, 1221 .proc_handler = proc_dointvec_minmax, 1222 .extra1 = &zero, 1223 }, 1224 #else 1225 { 1226 .procname = "nr_trim_pages", 1227 .data = &sysctl_nr_trim_pages, 1228 .maxlen = sizeof(sysctl_nr_trim_pages), 1229 .mode = 0644, 1230 .proc_handler = proc_dointvec_minmax, 1231 .extra1 = &zero, 1232 }, 1233 #endif 1234 { 1235 .procname = "laptop_mode", 1236 .data = &laptop_mode, 1237 .maxlen = sizeof(laptop_mode), 1238 .mode = 0644, 1239 .proc_handler = proc_dointvec_jiffies, 1240 }, 1241 { 1242 .procname = "block_dump", 1243 .data = &block_dump, 1244 .maxlen = sizeof(block_dump), 1245 .mode = 0644, 1246 .proc_handler = proc_dointvec, 1247 .extra1 = &zero, 1248 }, 1249 { 1250 .procname = "vfs_cache_pressure", 1251 .data = &sysctl_vfs_cache_pressure, 1252 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1253 .mode = 0644, 1254 .proc_handler = proc_dointvec, 1255 .extra1 = &zero, 1256 }, 1257 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1258 { 1259 .procname = "legacy_va_layout", 1260 .data = &sysctl_legacy_va_layout, 1261 .maxlen = sizeof(sysctl_legacy_va_layout), 1262 .mode = 0644, 1263 .proc_handler = proc_dointvec, 1264 .extra1 = &zero, 1265 }, 1266 #endif 1267 #ifdef CONFIG_NUMA 1268 { 1269 .procname = "zone_reclaim_mode", 1270 .data = &zone_reclaim_mode, 1271 .maxlen = sizeof(zone_reclaim_mode), 1272 .mode = 0644, 1273 .proc_handler = proc_dointvec, 1274 .extra1 = &zero, 1275 }, 1276 { 1277 .procname = "min_unmapped_ratio", 1278 .data = &sysctl_min_unmapped_ratio, 1279 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1280 .mode = 0644, 1281 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1282 .extra1 = &zero, 1283 .extra2 = &one_hundred, 1284 }, 1285 { 1286 .procname = "min_slab_ratio", 1287 .data = &sysctl_min_slab_ratio, 1288 .maxlen = sizeof(sysctl_min_slab_ratio), 1289 .mode = 0644, 1290 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1291 .extra1 = &zero, 1292 .extra2 = &one_hundred, 1293 }, 1294 #endif 1295 #ifdef CONFIG_SMP 1296 { 1297 .procname = "stat_interval", 1298 .data = &sysctl_stat_interval, 1299 .maxlen = sizeof(sysctl_stat_interval), 1300 .mode = 0644, 1301 .proc_handler = proc_dointvec_jiffies, 1302 }, 1303 #endif 1304 #ifdef CONFIG_MMU 1305 { 1306 .procname = "mmap_min_addr", 1307 .data = &dac_mmap_min_addr, 1308 .maxlen = sizeof(unsigned long), 1309 .mode = 0644, 1310 .proc_handler = mmap_min_addr_handler, 1311 }, 1312 #endif 1313 #ifdef CONFIG_NUMA 1314 { 1315 .procname = "numa_zonelist_order", 1316 .data = &numa_zonelist_order, 1317 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1318 .mode = 0644, 1319 .proc_handler = numa_zonelist_order_handler, 1320 }, 1321 #endif 1322 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1323 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1324 { 1325 .procname = "vdso_enabled", 1326 .data = &vdso_enabled, 1327 .maxlen = sizeof(vdso_enabled), 1328 .mode = 0644, 1329 .proc_handler = proc_dointvec, 1330 .extra1 = &zero, 1331 }, 1332 #endif 1333 #ifdef CONFIG_HIGHMEM 1334 { 1335 .procname = "highmem_is_dirtyable", 1336 .data = &vm_highmem_is_dirtyable, 1337 .maxlen = sizeof(vm_highmem_is_dirtyable), 1338 .mode = 0644, 1339 .proc_handler = proc_dointvec_minmax, 1340 .extra1 = &zero, 1341 .extra2 = &one, 1342 }, 1343 #endif 1344 { 1345 .procname = "scan_unevictable_pages", 1346 .data = &scan_unevictable_pages, 1347 .maxlen = sizeof(scan_unevictable_pages), 1348 .mode = 0644, 1349 .proc_handler = scan_unevictable_handler, 1350 }, 1351 #ifdef CONFIG_MEMORY_FAILURE 1352 { 1353 .procname = "memory_failure_early_kill", 1354 .data = &sysctl_memory_failure_early_kill, 1355 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1356 .mode = 0644, 1357 .proc_handler = proc_dointvec_minmax, 1358 .extra1 = &zero, 1359 .extra2 = &one, 1360 }, 1361 { 1362 .procname = "memory_failure_recovery", 1363 .data = &sysctl_memory_failure_recovery, 1364 .maxlen = sizeof(sysctl_memory_failure_recovery), 1365 .mode = 0644, 1366 .proc_handler = proc_dointvec_minmax, 1367 .extra1 = &zero, 1368 .extra2 = &one, 1369 }, 1370 #endif 1371 { } 1372 }; 1373 1374 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1375 static struct ctl_table binfmt_misc_table[] = { 1376 { } 1377 }; 1378 #endif 1379 1380 static struct ctl_table fs_table[] = { 1381 { 1382 .procname = "inode-nr", 1383 .data = &inodes_stat, 1384 .maxlen = 2*sizeof(int), 1385 .mode = 0444, 1386 .proc_handler = proc_nr_inodes, 1387 }, 1388 { 1389 .procname = "inode-state", 1390 .data = &inodes_stat, 1391 .maxlen = 7*sizeof(int), 1392 .mode = 0444, 1393 .proc_handler = proc_nr_inodes, 1394 }, 1395 { 1396 .procname = "file-nr", 1397 .data = &files_stat, 1398 .maxlen = sizeof(files_stat), 1399 .mode = 0444, 1400 .proc_handler = proc_nr_files, 1401 }, 1402 { 1403 .procname = "file-max", 1404 .data = &files_stat.max_files, 1405 .maxlen = sizeof(files_stat.max_files), 1406 .mode = 0644, 1407 .proc_handler = proc_doulongvec_minmax, 1408 }, 1409 { 1410 .procname = "nr_open", 1411 .data = &sysctl_nr_open, 1412 .maxlen = sizeof(int), 1413 .mode = 0644, 1414 .proc_handler = proc_dointvec_minmax, 1415 .extra1 = &sysctl_nr_open_min, 1416 .extra2 = &sysctl_nr_open_max, 1417 }, 1418 { 1419 .procname = "dentry-state", 1420 .data = &dentry_stat, 1421 .maxlen = 6*sizeof(int), 1422 .mode = 0444, 1423 .proc_handler = proc_nr_dentry, 1424 }, 1425 { 1426 .procname = "overflowuid", 1427 .data = &fs_overflowuid, 1428 .maxlen = sizeof(int), 1429 .mode = 0644, 1430 .proc_handler = proc_dointvec_minmax, 1431 .extra1 = &minolduid, 1432 .extra2 = &maxolduid, 1433 }, 1434 { 1435 .procname = "overflowgid", 1436 .data = &fs_overflowgid, 1437 .maxlen = sizeof(int), 1438 .mode = 0644, 1439 .proc_handler = proc_dointvec_minmax, 1440 .extra1 = &minolduid, 1441 .extra2 = &maxolduid, 1442 }, 1443 #ifdef CONFIG_FILE_LOCKING 1444 { 1445 .procname = "leases-enable", 1446 .data = &leases_enable, 1447 .maxlen = sizeof(int), 1448 .mode = 0644, 1449 .proc_handler = proc_dointvec, 1450 }, 1451 #endif 1452 #ifdef CONFIG_DNOTIFY 1453 { 1454 .procname = "dir-notify-enable", 1455 .data = &dir_notify_enable, 1456 .maxlen = sizeof(int), 1457 .mode = 0644, 1458 .proc_handler = proc_dointvec, 1459 }, 1460 #endif 1461 #ifdef CONFIG_MMU 1462 #ifdef CONFIG_FILE_LOCKING 1463 { 1464 .procname = "lease-break-time", 1465 .data = &lease_break_time, 1466 .maxlen = sizeof(int), 1467 .mode = 0644, 1468 .proc_handler = proc_dointvec, 1469 }, 1470 #endif 1471 #ifdef CONFIG_AIO 1472 { 1473 .procname = "aio-nr", 1474 .data = &aio_nr, 1475 .maxlen = sizeof(aio_nr), 1476 .mode = 0444, 1477 .proc_handler = proc_doulongvec_minmax, 1478 }, 1479 { 1480 .procname = "aio-max-nr", 1481 .data = &aio_max_nr, 1482 .maxlen = sizeof(aio_max_nr), 1483 .mode = 0644, 1484 .proc_handler = proc_doulongvec_minmax, 1485 }, 1486 #endif /* CONFIG_AIO */ 1487 #ifdef CONFIG_INOTIFY_USER 1488 { 1489 .procname = "inotify", 1490 .mode = 0555, 1491 .child = inotify_table, 1492 }, 1493 #endif 1494 #ifdef CONFIG_EPOLL 1495 { 1496 .procname = "epoll", 1497 .mode = 0555, 1498 .child = epoll_table, 1499 }, 1500 #endif 1501 #endif 1502 { 1503 .procname = "suid_dumpable", 1504 .data = &suid_dumpable, 1505 .maxlen = sizeof(int), 1506 .mode = 0644, 1507 .proc_handler = proc_dointvec_minmax_coredump, 1508 .extra1 = &zero, 1509 .extra2 = &two, 1510 }, 1511 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1512 { 1513 .procname = "binfmt_misc", 1514 .mode = 0555, 1515 .child = binfmt_misc_table, 1516 }, 1517 #endif 1518 { 1519 .procname = "pipe-max-size", 1520 .data = &pipe_max_size, 1521 .maxlen = sizeof(int), 1522 .mode = 0644, 1523 .proc_handler = &pipe_proc_fn, 1524 .extra1 = &pipe_min_size, 1525 }, 1526 { } 1527 }; 1528 1529 static struct ctl_table debug_table[] = { 1530 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1531 defined(CONFIG_S390) || defined(CONFIG_TILE) 1532 { 1533 .procname = "exception-trace", 1534 .data = &show_unhandled_signals, 1535 .maxlen = sizeof(int), 1536 .mode = 0644, 1537 .proc_handler = proc_dointvec 1538 }, 1539 #endif 1540 #if defined(CONFIG_OPTPROBES) 1541 { 1542 .procname = "kprobes-optimization", 1543 .data = &sysctl_kprobes_optimization, 1544 .maxlen = sizeof(int), 1545 .mode = 0644, 1546 .proc_handler = proc_kprobes_optimization_handler, 1547 .extra1 = &zero, 1548 .extra2 = &one, 1549 }, 1550 #endif 1551 { } 1552 }; 1553 1554 static struct ctl_table dev_table[] = { 1555 { } 1556 }; 1557 1558 int __init sysctl_init(void) 1559 { 1560 struct ctl_table_header *hdr; 1561 1562 hdr = register_sysctl_table(sysctl_base_table); 1563 kmemleak_not_leak(hdr); 1564 return 0; 1565 } 1566 1567 #endif /* CONFIG_SYSCTL */ 1568 1569 /* 1570 * /proc/sys support 1571 */ 1572 1573 #ifdef CONFIG_PROC_SYSCTL 1574 1575 static int _proc_do_string(void* data, int maxlen, int write, 1576 void __user *buffer, 1577 size_t *lenp, loff_t *ppos) 1578 { 1579 size_t len; 1580 char __user *p; 1581 char c; 1582 1583 if (!data || !maxlen || !*lenp) { 1584 *lenp = 0; 1585 return 0; 1586 } 1587 1588 if (write) { 1589 len = 0; 1590 p = buffer; 1591 while (len < *lenp) { 1592 if (get_user(c, p++)) 1593 return -EFAULT; 1594 if (c == 0 || c == '\n') 1595 break; 1596 len++; 1597 } 1598 if (len >= maxlen) 1599 len = maxlen-1; 1600 if(copy_from_user(data, buffer, len)) 1601 return -EFAULT; 1602 ((char *) data)[len] = 0; 1603 *ppos += *lenp; 1604 } else { 1605 len = strlen(data); 1606 if (len > maxlen) 1607 len = maxlen; 1608 1609 if (*ppos > len) { 1610 *lenp = 0; 1611 return 0; 1612 } 1613 1614 data += *ppos; 1615 len -= *ppos; 1616 1617 if (len > *lenp) 1618 len = *lenp; 1619 if (len) 1620 if(copy_to_user(buffer, data, len)) 1621 return -EFAULT; 1622 if (len < *lenp) { 1623 if(put_user('\n', ((char __user *) buffer) + len)) 1624 return -EFAULT; 1625 len++; 1626 } 1627 *lenp = len; 1628 *ppos += len; 1629 } 1630 return 0; 1631 } 1632 1633 /** 1634 * proc_dostring - read a string sysctl 1635 * @table: the sysctl table 1636 * @write: %TRUE if this is a write to the sysctl file 1637 * @buffer: the user buffer 1638 * @lenp: the size of the user buffer 1639 * @ppos: file position 1640 * 1641 * Reads/writes a string from/to the user buffer. If the kernel 1642 * buffer provided is not large enough to hold the string, the 1643 * string is truncated. The copied string is %NULL-terminated. 1644 * If the string is being read by the user process, it is copied 1645 * and a newline '\n' is added. It is truncated if the buffer is 1646 * not large enough. 1647 * 1648 * Returns 0 on success. 1649 */ 1650 int proc_dostring(struct ctl_table *table, int write, 1651 void __user *buffer, size_t *lenp, loff_t *ppos) 1652 { 1653 return _proc_do_string(table->data, table->maxlen, write, 1654 buffer, lenp, ppos); 1655 } 1656 1657 static size_t proc_skip_spaces(char **buf) 1658 { 1659 size_t ret; 1660 char *tmp = skip_spaces(*buf); 1661 ret = tmp - *buf; 1662 *buf = tmp; 1663 return ret; 1664 } 1665 1666 static void proc_skip_char(char **buf, size_t *size, const char v) 1667 { 1668 while (*size) { 1669 if (**buf != v) 1670 break; 1671 (*size)--; 1672 (*buf)++; 1673 } 1674 } 1675 1676 #define TMPBUFLEN 22 1677 /** 1678 * proc_get_long - reads an ASCII formatted integer from a user buffer 1679 * 1680 * @buf: a kernel buffer 1681 * @size: size of the kernel buffer 1682 * @val: this is where the number will be stored 1683 * @neg: set to %TRUE if number is negative 1684 * @perm_tr: a vector which contains the allowed trailers 1685 * @perm_tr_len: size of the perm_tr vector 1686 * @tr: pointer to store the trailer character 1687 * 1688 * In case of success %0 is returned and @buf and @size are updated with 1689 * the amount of bytes read. If @tr is non-NULL and a trailing 1690 * character exists (size is non-zero after returning from this 1691 * function), @tr is updated with the trailing character. 1692 */ 1693 static int proc_get_long(char **buf, size_t *size, 1694 unsigned long *val, bool *neg, 1695 const char *perm_tr, unsigned perm_tr_len, char *tr) 1696 { 1697 int len; 1698 char *p, tmp[TMPBUFLEN]; 1699 1700 if (!*size) 1701 return -EINVAL; 1702 1703 len = *size; 1704 if (len > TMPBUFLEN - 1) 1705 len = TMPBUFLEN - 1; 1706 1707 memcpy(tmp, *buf, len); 1708 1709 tmp[len] = 0; 1710 p = tmp; 1711 if (*p == '-' && *size > 1) { 1712 *neg = true; 1713 p++; 1714 } else 1715 *neg = false; 1716 if (!isdigit(*p)) 1717 return -EINVAL; 1718 1719 *val = simple_strtoul(p, &p, 0); 1720 1721 len = p - tmp; 1722 1723 /* We don't know if the next char is whitespace thus we may accept 1724 * invalid integers (e.g. 1234...a) or two integers instead of one 1725 * (e.g. 123...1). So lets not allow such large numbers. */ 1726 if (len == TMPBUFLEN - 1) 1727 return -EINVAL; 1728 1729 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1730 return -EINVAL; 1731 1732 if (tr && (len < *size)) 1733 *tr = *p; 1734 1735 *buf += len; 1736 *size -= len; 1737 1738 return 0; 1739 } 1740 1741 /** 1742 * proc_put_long - converts an integer to a decimal ASCII formatted string 1743 * 1744 * @buf: the user buffer 1745 * @size: the size of the user buffer 1746 * @val: the integer to be converted 1747 * @neg: sign of the number, %TRUE for negative 1748 * 1749 * In case of success %0 is returned and @buf and @size are updated with 1750 * the amount of bytes written. 1751 */ 1752 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1753 bool neg) 1754 { 1755 int len; 1756 char tmp[TMPBUFLEN], *p = tmp; 1757 1758 sprintf(p, "%s%lu", neg ? "-" : "", val); 1759 len = strlen(tmp); 1760 if (len > *size) 1761 len = *size; 1762 if (copy_to_user(*buf, tmp, len)) 1763 return -EFAULT; 1764 *size -= len; 1765 *buf += len; 1766 return 0; 1767 } 1768 #undef TMPBUFLEN 1769 1770 static int proc_put_char(void __user **buf, size_t *size, char c) 1771 { 1772 if (*size) { 1773 char __user **buffer = (char __user **)buf; 1774 if (put_user(c, *buffer)) 1775 return -EFAULT; 1776 (*size)--, (*buffer)++; 1777 *buf = *buffer; 1778 } 1779 return 0; 1780 } 1781 1782 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1783 int *valp, 1784 int write, void *data) 1785 { 1786 if (write) { 1787 *valp = *negp ? -*lvalp : *lvalp; 1788 } else { 1789 int val = *valp; 1790 if (val < 0) { 1791 *negp = true; 1792 *lvalp = (unsigned long)-val; 1793 } else { 1794 *negp = false; 1795 *lvalp = (unsigned long)val; 1796 } 1797 } 1798 return 0; 1799 } 1800 1801 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1802 1803 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1804 int write, void __user *buffer, 1805 size_t *lenp, loff_t *ppos, 1806 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1807 int write, void *data), 1808 void *data) 1809 { 1810 int *i, vleft, first = 1, err = 0; 1811 unsigned long page = 0; 1812 size_t left; 1813 char *kbuf; 1814 1815 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1816 *lenp = 0; 1817 return 0; 1818 } 1819 1820 i = (int *) tbl_data; 1821 vleft = table->maxlen / sizeof(*i); 1822 left = *lenp; 1823 1824 if (!conv) 1825 conv = do_proc_dointvec_conv; 1826 1827 if (write) { 1828 if (left > PAGE_SIZE - 1) 1829 left = PAGE_SIZE - 1; 1830 page = __get_free_page(GFP_TEMPORARY); 1831 kbuf = (char *) page; 1832 if (!kbuf) 1833 return -ENOMEM; 1834 if (copy_from_user(kbuf, buffer, left)) { 1835 err = -EFAULT; 1836 goto free; 1837 } 1838 kbuf[left] = 0; 1839 } 1840 1841 for (; left && vleft--; i++, first=0) { 1842 unsigned long lval; 1843 bool neg; 1844 1845 if (write) { 1846 left -= proc_skip_spaces(&kbuf); 1847 1848 if (!left) 1849 break; 1850 err = proc_get_long(&kbuf, &left, &lval, &neg, 1851 proc_wspace_sep, 1852 sizeof(proc_wspace_sep), NULL); 1853 if (err) 1854 break; 1855 if (conv(&neg, &lval, i, 1, data)) { 1856 err = -EINVAL; 1857 break; 1858 } 1859 } else { 1860 if (conv(&neg, &lval, i, 0, data)) { 1861 err = -EINVAL; 1862 break; 1863 } 1864 if (!first) 1865 err = proc_put_char(&buffer, &left, '\t'); 1866 if (err) 1867 break; 1868 err = proc_put_long(&buffer, &left, lval, neg); 1869 if (err) 1870 break; 1871 } 1872 } 1873 1874 if (!write && !first && left && !err) 1875 err = proc_put_char(&buffer, &left, '\n'); 1876 if (write && !err && left) 1877 left -= proc_skip_spaces(&kbuf); 1878 free: 1879 if (write) { 1880 free_page(page); 1881 if (first) 1882 return err ? : -EINVAL; 1883 } 1884 *lenp -= left; 1885 *ppos += *lenp; 1886 return err; 1887 } 1888 1889 static int do_proc_dointvec(struct ctl_table *table, int write, 1890 void __user *buffer, size_t *lenp, loff_t *ppos, 1891 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1892 int write, void *data), 1893 void *data) 1894 { 1895 return __do_proc_dointvec(table->data, table, write, 1896 buffer, lenp, ppos, conv, data); 1897 } 1898 1899 /** 1900 * proc_dointvec - read a vector of integers 1901 * @table: the sysctl table 1902 * @write: %TRUE if this is a write to the sysctl file 1903 * @buffer: the user buffer 1904 * @lenp: the size of the user buffer 1905 * @ppos: file position 1906 * 1907 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1908 * values from/to the user buffer, treated as an ASCII string. 1909 * 1910 * Returns 0 on success. 1911 */ 1912 int proc_dointvec(struct ctl_table *table, int write, 1913 void __user *buffer, size_t *lenp, loff_t *ppos) 1914 { 1915 return do_proc_dointvec(table,write,buffer,lenp,ppos, 1916 NULL,NULL); 1917 } 1918 1919 /* 1920 * Taint values can only be increased 1921 * This means we can safely use a temporary. 1922 */ 1923 static int proc_taint(struct ctl_table *table, int write, 1924 void __user *buffer, size_t *lenp, loff_t *ppos) 1925 { 1926 struct ctl_table t; 1927 unsigned long tmptaint = get_taint(); 1928 int err; 1929 1930 if (write && !capable(CAP_SYS_ADMIN)) 1931 return -EPERM; 1932 1933 t = *table; 1934 t.data = &tmptaint; 1935 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 1936 if (err < 0) 1937 return err; 1938 1939 if (write) { 1940 /* 1941 * Poor man's atomic or. Not worth adding a primitive 1942 * to everyone's atomic.h for this 1943 */ 1944 int i; 1945 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 1946 if ((tmptaint >> i) & 1) 1947 add_taint(i); 1948 } 1949 } 1950 1951 return err; 1952 } 1953 1954 #ifdef CONFIG_PRINTK 1955 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 1956 void __user *buffer, size_t *lenp, loff_t *ppos) 1957 { 1958 if (write && !capable(CAP_SYS_ADMIN)) 1959 return -EPERM; 1960 1961 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 1962 } 1963 #endif 1964 1965 struct do_proc_dointvec_minmax_conv_param { 1966 int *min; 1967 int *max; 1968 }; 1969 1970 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 1971 int *valp, 1972 int write, void *data) 1973 { 1974 struct do_proc_dointvec_minmax_conv_param *param = data; 1975 if (write) { 1976 int val = *negp ? -*lvalp : *lvalp; 1977 if ((param->min && *param->min > val) || 1978 (param->max && *param->max < val)) 1979 return -EINVAL; 1980 *valp = val; 1981 } else { 1982 int val = *valp; 1983 if (val < 0) { 1984 *negp = true; 1985 *lvalp = (unsigned long)-val; 1986 } else { 1987 *negp = false; 1988 *lvalp = (unsigned long)val; 1989 } 1990 } 1991 return 0; 1992 } 1993 1994 /** 1995 * proc_dointvec_minmax - read a vector of integers with min/max values 1996 * @table: the sysctl table 1997 * @write: %TRUE if this is a write to the sysctl file 1998 * @buffer: the user buffer 1999 * @lenp: the size of the user buffer 2000 * @ppos: file position 2001 * 2002 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2003 * values from/to the user buffer, treated as an ASCII string. 2004 * 2005 * This routine will ensure the values are within the range specified by 2006 * table->extra1 (min) and table->extra2 (max). 2007 * 2008 * Returns 0 on success. 2009 */ 2010 int proc_dointvec_minmax(struct ctl_table *table, int write, 2011 void __user *buffer, size_t *lenp, loff_t *ppos) 2012 { 2013 struct do_proc_dointvec_minmax_conv_param param = { 2014 .min = (int *) table->extra1, 2015 .max = (int *) table->extra2, 2016 }; 2017 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2018 do_proc_dointvec_minmax_conv, ¶m); 2019 } 2020 2021 static void validate_coredump_safety(void) 2022 { 2023 if (suid_dumpable == SUID_DUMPABLE_SAFE && 2024 core_pattern[0] != '/' && core_pattern[0] != '|') { 2025 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2026 "suid_dumpable=2. Pipe handler or fully qualified "\ 2027 "core dump path required.\n"); 2028 } 2029 } 2030 2031 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2032 void __user *buffer, size_t *lenp, loff_t *ppos) 2033 { 2034 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2035 if (!error) 2036 validate_coredump_safety(); 2037 return error; 2038 } 2039 2040 static int proc_dostring_coredump(struct ctl_table *table, int write, 2041 void __user *buffer, size_t *lenp, loff_t *ppos) 2042 { 2043 int error = proc_dostring(table, write, buffer, lenp, ppos); 2044 if (!error) 2045 validate_coredump_safety(); 2046 return error; 2047 } 2048 2049 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2050 void __user *buffer, 2051 size_t *lenp, loff_t *ppos, 2052 unsigned long convmul, 2053 unsigned long convdiv) 2054 { 2055 unsigned long *i, *min, *max; 2056 int vleft, first = 1, err = 0; 2057 unsigned long page = 0; 2058 size_t left; 2059 char *kbuf; 2060 2061 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2062 *lenp = 0; 2063 return 0; 2064 } 2065 2066 i = (unsigned long *) data; 2067 min = (unsigned long *) table->extra1; 2068 max = (unsigned long *) table->extra2; 2069 vleft = table->maxlen / sizeof(unsigned long); 2070 left = *lenp; 2071 2072 if (write) { 2073 if (left > PAGE_SIZE - 1) 2074 left = PAGE_SIZE - 1; 2075 page = __get_free_page(GFP_TEMPORARY); 2076 kbuf = (char *) page; 2077 if (!kbuf) 2078 return -ENOMEM; 2079 if (copy_from_user(kbuf, buffer, left)) { 2080 err = -EFAULT; 2081 goto free; 2082 } 2083 kbuf[left] = 0; 2084 } 2085 2086 for (; left && vleft--; i++, first = 0) { 2087 unsigned long val; 2088 2089 if (write) { 2090 bool neg; 2091 2092 left -= proc_skip_spaces(&kbuf); 2093 2094 err = proc_get_long(&kbuf, &left, &val, &neg, 2095 proc_wspace_sep, 2096 sizeof(proc_wspace_sep), NULL); 2097 if (err) 2098 break; 2099 if (neg) 2100 continue; 2101 if ((min && val < *min) || (max && val > *max)) 2102 continue; 2103 *i = val; 2104 } else { 2105 val = convdiv * (*i) / convmul; 2106 if (!first) 2107 err = proc_put_char(&buffer, &left, '\t'); 2108 err = proc_put_long(&buffer, &left, val, false); 2109 if (err) 2110 break; 2111 } 2112 } 2113 2114 if (!write && !first && left && !err) 2115 err = proc_put_char(&buffer, &left, '\n'); 2116 if (write && !err) 2117 left -= proc_skip_spaces(&kbuf); 2118 free: 2119 if (write) { 2120 free_page(page); 2121 if (first) 2122 return err ? : -EINVAL; 2123 } 2124 *lenp -= left; 2125 *ppos += *lenp; 2126 return err; 2127 } 2128 2129 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2130 void __user *buffer, 2131 size_t *lenp, loff_t *ppos, 2132 unsigned long convmul, 2133 unsigned long convdiv) 2134 { 2135 return __do_proc_doulongvec_minmax(table->data, table, write, 2136 buffer, lenp, ppos, convmul, convdiv); 2137 } 2138 2139 /** 2140 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2141 * @table: the sysctl table 2142 * @write: %TRUE if this is a write to the sysctl file 2143 * @buffer: the user buffer 2144 * @lenp: the size of the user buffer 2145 * @ppos: file position 2146 * 2147 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2148 * values from/to the user buffer, treated as an ASCII string. 2149 * 2150 * This routine will ensure the values are within the range specified by 2151 * table->extra1 (min) and table->extra2 (max). 2152 * 2153 * Returns 0 on success. 2154 */ 2155 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2156 void __user *buffer, size_t *lenp, loff_t *ppos) 2157 { 2158 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2159 } 2160 2161 /** 2162 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2163 * @table: the sysctl table 2164 * @write: %TRUE if this is a write to the sysctl file 2165 * @buffer: the user buffer 2166 * @lenp: the size of the user buffer 2167 * @ppos: file position 2168 * 2169 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2170 * values from/to the user buffer, treated as an ASCII string. The values 2171 * are treated as milliseconds, and converted to jiffies when they are stored. 2172 * 2173 * This routine will ensure the values are within the range specified by 2174 * table->extra1 (min) and table->extra2 (max). 2175 * 2176 * Returns 0 on success. 2177 */ 2178 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2179 void __user *buffer, 2180 size_t *lenp, loff_t *ppos) 2181 { 2182 return do_proc_doulongvec_minmax(table, write, buffer, 2183 lenp, ppos, HZ, 1000l); 2184 } 2185 2186 2187 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2188 int *valp, 2189 int write, void *data) 2190 { 2191 if (write) { 2192 if (*lvalp > LONG_MAX / HZ) 2193 return 1; 2194 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2195 } else { 2196 int val = *valp; 2197 unsigned long lval; 2198 if (val < 0) { 2199 *negp = true; 2200 lval = (unsigned long)-val; 2201 } else { 2202 *negp = false; 2203 lval = (unsigned long)val; 2204 } 2205 *lvalp = lval / HZ; 2206 } 2207 return 0; 2208 } 2209 2210 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2211 int *valp, 2212 int write, void *data) 2213 { 2214 if (write) { 2215 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2216 return 1; 2217 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2218 } else { 2219 int val = *valp; 2220 unsigned long lval; 2221 if (val < 0) { 2222 *negp = true; 2223 lval = (unsigned long)-val; 2224 } else { 2225 *negp = false; 2226 lval = (unsigned long)val; 2227 } 2228 *lvalp = jiffies_to_clock_t(lval); 2229 } 2230 return 0; 2231 } 2232 2233 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2234 int *valp, 2235 int write, void *data) 2236 { 2237 if (write) { 2238 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2239 } else { 2240 int val = *valp; 2241 unsigned long lval; 2242 if (val < 0) { 2243 *negp = true; 2244 lval = (unsigned long)-val; 2245 } else { 2246 *negp = false; 2247 lval = (unsigned long)val; 2248 } 2249 *lvalp = jiffies_to_msecs(lval); 2250 } 2251 return 0; 2252 } 2253 2254 /** 2255 * proc_dointvec_jiffies - read a vector of integers as seconds 2256 * @table: the sysctl table 2257 * @write: %TRUE if this is a write to the sysctl file 2258 * @buffer: the user buffer 2259 * @lenp: the size of the user buffer 2260 * @ppos: file position 2261 * 2262 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2263 * values from/to the user buffer, treated as an ASCII string. 2264 * The values read are assumed to be in seconds, and are converted into 2265 * jiffies. 2266 * 2267 * Returns 0 on success. 2268 */ 2269 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2270 void __user *buffer, size_t *lenp, loff_t *ppos) 2271 { 2272 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2273 do_proc_dointvec_jiffies_conv,NULL); 2274 } 2275 2276 /** 2277 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2278 * @table: the sysctl table 2279 * @write: %TRUE if this is a write to the sysctl file 2280 * @buffer: the user buffer 2281 * @lenp: the size of the user buffer 2282 * @ppos: pointer to the file position 2283 * 2284 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2285 * values from/to the user buffer, treated as an ASCII string. 2286 * The values read are assumed to be in 1/USER_HZ seconds, and 2287 * are converted into jiffies. 2288 * 2289 * Returns 0 on success. 2290 */ 2291 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2292 void __user *buffer, size_t *lenp, loff_t *ppos) 2293 { 2294 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2295 do_proc_dointvec_userhz_jiffies_conv,NULL); 2296 } 2297 2298 /** 2299 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2300 * @table: the sysctl table 2301 * @write: %TRUE if this is a write to the sysctl file 2302 * @buffer: the user buffer 2303 * @lenp: the size of the user buffer 2304 * @ppos: file position 2305 * @ppos: the current position in the file 2306 * 2307 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2308 * values from/to the user buffer, treated as an ASCII string. 2309 * The values read are assumed to be in 1/1000 seconds, and 2310 * are converted into jiffies. 2311 * 2312 * Returns 0 on success. 2313 */ 2314 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2315 void __user *buffer, size_t *lenp, loff_t *ppos) 2316 { 2317 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2318 do_proc_dointvec_ms_jiffies_conv, NULL); 2319 } 2320 2321 static int proc_do_cad_pid(struct ctl_table *table, int write, 2322 void __user *buffer, size_t *lenp, loff_t *ppos) 2323 { 2324 struct pid *new_pid; 2325 pid_t tmp; 2326 int r; 2327 2328 tmp = pid_vnr(cad_pid); 2329 2330 r = __do_proc_dointvec(&tmp, table, write, buffer, 2331 lenp, ppos, NULL, NULL); 2332 if (r || !write) 2333 return r; 2334 2335 new_pid = find_get_pid(tmp); 2336 if (!new_pid) 2337 return -ESRCH; 2338 2339 put_pid(xchg(&cad_pid, new_pid)); 2340 return 0; 2341 } 2342 2343 /** 2344 * proc_do_large_bitmap - read/write from/to a large bitmap 2345 * @table: the sysctl table 2346 * @write: %TRUE if this is a write to the sysctl file 2347 * @buffer: the user buffer 2348 * @lenp: the size of the user buffer 2349 * @ppos: file position 2350 * 2351 * The bitmap is stored at table->data and the bitmap length (in bits) 2352 * in table->maxlen. 2353 * 2354 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2355 * large bitmaps may be represented in a compact manner. Writing into 2356 * the file will clear the bitmap then update it with the given input. 2357 * 2358 * Returns 0 on success. 2359 */ 2360 int proc_do_large_bitmap(struct ctl_table *table, int write, 2361 void __user *buffer, size_t *lenp, loff_t *ppos) 2362 { 2363 int err = 0; 2364 bool first = 1; 2365 size_t left = *lenp; 2366 unsigned long bitmap_len = table->maxlen; 2367 unsigned long *bitmap = (unsigned long *) table->data; 2368 unsigned long *tmp_bitmap = NULL; 2369 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2370 2371 if (!bitmap_len || !left || (*ppos && !write)) { 2372 *lenp = 0; 2373 return 0; 2374 } 2375 2376 if (write) { 2377 unsigned long page = 0; 2378 char *kbuf; 2379 2380 if (left > PAGE_SIZE - 1) 2381 left = PAGE_SIZE - 1; 2382 2383 page = __get_free_page(GFP_TEMPORARY); 2384 kbuf = (char *) page; 2385 if (!kbuf) 2386 return -ENOMEM; 2387 if (copy_from_user(kbuf, buffer, left)) { 2388 free_page(page); 2389 return -EFAULT; 2390 } 2391 kbuf[left] = 0; 2392 2393 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2394 GFP_KERNEL); 2395 if (!tmp_bitmap) { 2396 free_page(page); 2397 return -ENOMEM; 2398 } 2399 proc_skip_char(&kbuf, &left, '\n'); 2400 while (!err && left) { 2401 unsigned long val_a, val_b; 2402 bool neg; 2403 2404 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2405 sizeof(tr_a), &c); 2406 if (err) 2407 break; 2408 if (val_a >= bitmap_len || neg) { 2409 err = -EINVAL; 2410 break; 2411 } 2412 2413 val_b = val_a; 2414 if (left) { 2415 kbuf++; 2416 left--; 2417 } 2418 2419 if (c == '-') { 2420 err = proc_get_long(&kbuf, &left, &val_b, 2421 &neg, tr_b, sizeof(tr_b), 2422 &c); 2423 if (err) 2424 break; 2425 if (val_b >= bitmap_len || neg || 2426 val_a > val_b) { 2427 err = -EINVAL; 2428 break; 2429 } 2430 if (left) { 2431 kbuf++; 2432 left--; 2433 } 2434 } 2435 2436 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2437 first = 0; 2438 proc_skip_char(&kbuf, &left, '\n'); 2439 } 2440 free_page(page); 2441 } else { 2442 unsigned long bit_a, bit_b = 0; 2443 2444 while (left) { 2445 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2446 if (bit_a >= bitmap_len) 2447 break; 2448 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2449 bit_a + 1) - 1; 2450 2451 if (!first) { 2452 err = proc_put_char(&buffer, &left, ','); 2453 if (err) 2454 break; 2455 } 2456 err = proc_put_long(&buffer, &left, bit_a, false); 2457 if (err) 2458 break; 2459 if (bit_a != bit_b) { 2460 err = proc_put_char(&buffer, &left, '-'); 2461 if (err) 2462 break; 2463 err = proc_put_long(&buffer, &left, bit_b, false); 2464 if (err) 2465 break; 2466 } 2467 2468 first = 0; bit_b++; 2469 } 2470 if (!err) 2471 err = proc_put_char(&buffer, &left, '\n'); 2472 } 2473 2474 if (!err) { 2475 if (write) { 2476 if (*ppos) 2477 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2478 else 2479 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2480 } 2481 kfree(tmp_bitmap); 2482 *lenp -= left; 2483 *ppos += *lenp; 2484 return 0; 2485 } else { 2486 kfree(tmp_bitmap); 2487 return err; 2488 } 2489 } 2490 2491 #else /* CONFIG_PROC_SYSCTL */ 2492 2493 int proc_dostring(struct ctl_table *table, int write, 2494 void __user *buffer, size_t *lenp, loff_t *ppos) 2495 { 2496 return -ENOSYS; 2497 } 2498 2499 int proc_dointvec(struct ctl_table *table, int write, 2500 void __user *buffer, size_t *lenp, loff_t *ppos) 2501 { 2502 return -ENOSYS; 2503 } 2504 2505 int proc_dointvec_minmax(struct ctl_table *table, int write, 2506 void __user *buffer, size_t *lenp, loff_t *ppos) 2507 { 2508 return -ENOSYS; 2509 } 2510 2511 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2512 void __user *buffer, size_t *lenp, loff_t *ppos) 2513 { 2514 return -ENOSYS; 2515 } 2516 2517 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2518 void __user *buffer, size_t *lenp, loff_t *ppos) 2519 { 2520 return -ENOSYS; 2521 } 2522 2523 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2524 void __user *buffer, size_t *lenp, loff_t *ppos) 2525 { 2526 return -ENOSYS; 2527 } 2528 2529 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2530 void __user *buffer, size_t *lenp, loff_t *ppos) 2531 { 2532 return -ENOSYS; 2533 } 2534 2535 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2536 void __user *buffer, 2537 size_t *lenp, loff_t *ppos) 2538 { 2539 return -ENOSYS; 2540 } 2541 2542 2543 #endif /* CONFIG_PROC_SYSCTL */ 2544 2545 /* 2546 * No sense putting this after each symbol definition, twice, 2547 * exception granted :-) 2548 */ 2549 EXPORT_SYMBOL(proc_dointvec); 2550 EXPORT_SYMBOL(proc_dointvec_jiffies); 2551 EXPORT_SYMBOL(proc_dointvec_minmax); 2552 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2553 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2554 EXPORT_SYMBOL(proc_dostring); 2555 EXPORT_SYMBOL(proc_doulongvec_minmax); 2556 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2557