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 .mode = 0444 /* read-only */, 1106 .proc_handler = pdflush_proc_obsolete, 1107 }, 1108 { 1109 .procname = "swappiness", 1110 .data = &vm_swappiness, 1111 .maxlen = sizeof(vm_swappiness), 1112 .mode = 0644, 1113 .proc_handler = proc_dointvec_minmax, 1114 .extra1 = &zero, 1115 .extra2 = &one_hundred, 1116 }, 1117 #ifdef CONFIG_HUGETLB_PAGE 1118 { 1119 .procname = "nr_hugepages", 1120 .data = NULL, 1121 .maxlen = sizeof(unsigned long), 1122 .mode = 0644, 1123 .proc_handler = hugetlb_sysctl_handler, 1124 .extra1 = (void *)&hugetlb_zero, 1125 .extra2 = (void *)&hugetlb_infinity, 1126 }, 1127 #ifdef CONFIG_NUMA 1128 { 1129 .procname = "nr_hugepages_mempolicy", 1130 .data = NULL, 1131 .maxlen = sizeof(unsigned long), 1132 .mode = 0644, 1133 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1134 .extra1 = (void *)&hugetlb_zero, 1135 .extra2 = (void *)&hugetlb_infinity, 1136 }, 1137 #endif 1138 { 1139 .procname = "hugetlb_shm_group", 1140 .data = &sysctl_hugetlb_shm_group, 1141 .maxlen = sizeof(gid_t), 1142 .mode = 0644, 1143 .proc_handler = proc_dointvec, 1144 }, 1145 { 1146 .procname = "hugepages_treat_as_movable", 1147 .data = &hugepages_treat_as_movable, 1148 .maxlen = sizeof(int), 1149 .mode = 0644, 1150 .proc_handler = hugetlb_treat_movable_handler, 1151 }, 1152 { 1153 .procname = "nr_overcommit_hugepages", 1154 .data = NULL, 1155 .maxlen = sizeof(unsigned long), 1156 .mode = 0644, 1157 .proc_handler = hugetlb_overcommit_handler, 1158 .extra1 = (void *)&hugetlb_zero, 1159 .extra2 = (void *)&hugetlb_infinity, 1160 }, 1161 #endif 1162 { 1163 .procname = "lowmem_reserve_ratio", 1164 .data = &sysctl_lowmem_reserve_ratio, 1165 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1166 .mode = 0644, 1167 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1168 }, 1169 { 1170 .procname = "drop_caches", 1171 .data = &sysctl_drop_caches, 1172 .maxlen = sizeof(int), 1173 .mode = 0644, 1174 .proc_handler = drop_caches_sysctl_handler, 1175 .extra1 = &one, 1176 .extra2 = &three, 1177 }, 1178 #ifdef CONFIG_COMPACTION 1179 { 1180 .procname = "compact_memory", 1181 .data = &sysctl_compact_memory, 1182 .maxlen = sizeof(int), 1183 .mode = 0200, 1184 .proc_handler = sysctl_compaction_handler, 1185 }, 1186 { 1187 .procname = "extfrag_threshold", 1188 .data = &sysctl_extfrag_threshold, 1189 .maxlen = sizeof(int), 1190 .mode = 0644, 1191 .proc_handler = sysctl_extfrag_handler, 1192 .extra1 = &min_extfrag_threshold, 1193 .extra2 = &max_extfrag_threshold, 1194 }, 1195 1196 #endif /* CONFIG_COMPACTION */ 1197 { 1198 .procname = "min_free_kbytes", 1199 .data = &min_free_kbytes, 1200 .maxlen = sizeof(min_free_kbytes), 1201 .mode = 0644, 1202 .proc_handler = min_free_kbytes_sysctl_handler, 1203 .extra1 = &zero, 1204 }, 1205 { 1206 .procname = "percpu_pagelist_fraction", 1207 .data = &percpu_pagelist_fraction, 1208 .maxlen = sizeof(percpu_pagelist_fraction), 1209 .mode = 0644, 1210 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1211 .extra1 = &min_percpu_pagelist_fract, 1212 }, 1213 #ifdef CONFIG_MMU 1214 { 1215 .procname = "max_map_count", 1216 .data = &sysctl_max_map_count, 1217 .maxlen = sizeof(sysctl_max_map_count), 1218 .mode = 0644, 1219 .proc_handler = proc_dointvec_minmax, 1220 .extra1 = &zero, 1221 }, 1222 #else 1223 { 1224 .procname = "nr_trim_pages", 1225 .data = &sysctl_nr_trim_pages, 1226 .maxlen = sizeof(sysctl_nr_trim_pages), 1227 .mode = 0644, 1228 .proc_handler = proc_dointvec_minmax, 1229 .extra1 = &zero, 1230 }, 1231 #endif 1232 { 1233 .procname = "laptop_mode", 1234 .data = &laptop_mode, 1235 .maxlen = sizeof(laptop_mode), 1236 .mode = 0644, 1237 .proc_handler = proc_dointvec_jiffies, 1238 }, 1239 { 1240 .procname = "block_dump", 1241 .data = &block_dump, 1242 .maxlen = sizeof(block_dump), 1243 .mode = 0644, 1244 .proc_handler = proc_dointvec, 1245 .extra1 = &zero, 1246 }, 1247 { 1248 .procname = "vfs_cache_pressure", 1249 .data = &sysctl_vfs_cache_pressure, 1250 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1251 .mode = 0644, 1252 .proc_handler = proc_dointvec, 1253 .extra1 = &zero, 1254 }, 1255 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1256 { 1257 .procname = "legacy_va_layout", 1258 .data = &sysctl_legacy_va_layout, 1259 .maxlen = sizeof(sysctl_legacy_va_layout), 1260 .mode = 0644, 1261 .proc_handler = proc_dointvec, 1262 .extra1 = &zero, 1263 }, 1264 #endif 1265 #ifdef CONFIG_NUMA 1266 { 1267 .procname = "zone_reclaim_mode", 1268 .data = &zone_reclaim_mode, 1269 .maxlen = sizeof(zone_reclaim_mode), 1270 .mode = 0644, 1271 .proc_handler = proc_dointvec, 1272 .extra1 = &zero, 1273 }, 1274 { 1275 .procname = "min_unmapped_ratio", 1276 .data = &sysctl_min_unmapped_ratio, 1277 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1278 .mode = 0644, 1279 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1280 .extra1 = &zero, 1281 .extra2 = &one_hundred, 1282 }, 1283 { 1284 .procname = "min_slab_ratio", 1285 .data = &sysctl_min_slab_ratio, 1286 .maxlen = sizeof(sysctl_min_slab_ratio), 1287 .mode = 0644, 1288 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1289 .extra1 = &zero, 1290 .extra2 = &one_hundred, 1291 }, 1292 #endif 1293 #ifdef CONFIG_SMP 1294 { 1295 .procname = "stat_interval", 1296 .data = &sysctl_stat_interval, 1297 .maxlen = sizeof(sysctl_stat_interval), 1298 .mode = 0644, 1299 .proc_handler = proc_dointvec_jiffies, 1300 }, 1301 #endif 1302 #ifdef CONFIG_MMU 1303 { 1304 .procname = "mmap_min_addr", 1305 .data = &dac_mmap_min_addr, 1306 .maxlen = sizeof(unsigned long), 1307 .mode = 0644, 1308 .proc_handler = mmap_min_addr_handler, 1309 }, 1310 #endif 1311 #ifdef CONFIG_NUMA 1312 { 1313 .procname = "numa_zonelist_order", 1314 .data = &numa_zonelist_order, 1315 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1316 .mode = 0644, 1317 .proc_handler = numa_zonelist_order_handler, 1318 }, 1319 #endif 1320 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1321 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1322 { 1323 .procname = "vdso_enabled", 1324 .data = &vdso_enabled, 1325 .maxlen = sizeof(vdso_enabled), 1326 .mode = 0644, 1327 .proc_handler = proc_dointvec, 1328 .extra1 = &zero, 1329 }, 1330 #endif 1331 #ifdef CONFIG_HIGHMEM 1332 { 1333 .procname = "highmem_is_dirtyable", 1334 .data = &vm_highmem_is_dirtyable, 1335 .maxlen = sizeof(vm_highmem_is_dirtyable), 1336 .mode = 0644, 1337 .proc_handler = proc_dointvec_minmax, 1338 .extra1 = &zero, 1339 .extra2 = &one, 1340 }, 1341 #endif 1342 { 1343 .procname = "scan_unevictable_pages", 1344 .data = &scan_unevictable_pages, 1345 .maxlen = sizeof(scan_unevictable_pages), 1346 .mode = 0644, 1347 .proc_handler = scan_unevictable_handler, 1348 }, 1349 #ifdef CONFIG_MEMORY_FAILURE 1350 { 1351 .procname = "memory_failure_early_kill", 1352 .data = &sysctl_memory_failure_early_kill, 1353 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1354 .mode = 0644, 1355 .proc_handler = proc_dointvec_minmax, 1356 .extra1 = &zero, 1357 .extra2 = &one, 1358 }, 1359 { 1360 .procname = "memory_failure_recovery", 1361 .data = &sysctl_memory_failure_recovery, 1362 .maxlen = sizeof(sysctl_memory_failure_recovery), 1363 .mode = 0644, 1364 .proc_handler = proc_dointvec_minmax, 1365 .extra1 = &zero, 1366 .extra2 = &one, 1367 }, 1368 #endif 1369 { } 1370 }; 1371 1372 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1373 static struct ctl_table binfmt_misc_table[] = { 1374 { } 1375 }; 1376 #endif 1377 1378 static struct ctl_table fs_table[] = { 1379 { 1380 .procname = "inode-nr", 1381 .data = &inodes_stat, 1382 .maxlen = 2*sizeof(int), 1383 .mode = 0444, 1384 .proc_handler = proc_nr_inodes, 1385 }, 1386 { 1387 .procname = "inode-state", 1388 .data = &inodes_stat, 1389 .maxlen = 7*sizeof(int), 1390 .mode = 0444, 1391 .proc_handler = proc_nr_inodes, 1392 }, 1393 { 1394 .procname = "file-nr", 1395 .data = &files_stat, 1396 .maxlen = sizeof(files_stat), 1397 .mode = 0444, 1398 .proc_handler = proc_nr_files, 1399 }, 1400 { 1401 .procname = "file-max", 1402 .data = &files_stat.max_files, 1403 .maxlen = sizeof(files_stat.max_files), 1404 .mode = 0644, 1405 .proc_handler = proc_doulongvec_minmax, 1406 }, 1407 { 1408 .procname = "nr_open", 1409 .data = &sysctl_nr_open, 1410 .maxlen = sizeof(int), 1411 .mode = 0644, 1412 .proc_handler = proc_dointvec_minmax, 1413 .extra1 = &sysctl_nr_open_min, 1414 .extra2 = &sysctl_nr_open_max, 1415 }, 1416 { 1417 .procname = "dentry-state", 1418 .data = &dentry_stat, 1419 .maxlen = 6*sizeof(int), 1420 .mode = 0444, 1421 .proc_handler = proc_nr_dentry, 1422 }, 1423 { 1424 .procname = "overflowuid", 1425 .data = &fs_overflowuid, 1426 .maxlen = sizeof(int), 1427 .mode = 0644, 1428 .proc_handler = proc_dointvec_minmax, 1429 .extra1 = &minolduid, 1430 .extra2 = &maxolduid, 1431 }, 1432 { 1433 .procname = "overflowgid", 1434 .data = &fs_overflowgid, 1435 .maxlen = sizeof(int), 1436 .mode = 0644, 1437 .proc_handler = proc_dointvec_minmax, 1438 .extra1 = &minolduid, 1439 .extra2 = &maxolduid, 1440 }, 1441 #ifdef CONFIG_FILE_LOCKING 1442 { 1443 .procname = "leases-enable", 1444 .data = &leases_enable, 1445 .maxlen = sizeof(int), 1446 .mode = 0644, 1447 .proc_handler = proc_dointvec, 1448 }, 1449 #endif 1450 #ifdef CONFIG_DNOTIFY 1451 { 1452 .procname = "dir-notify-enable", 1453 .data = &dir_notify_enable, 1454 .maxlen = sizeof(int), 1455 .mode = 0644, 1456 .proc_handler = proc_dointvec, 1457 }, 1458 #endif 1459 #ifdef CONFIG_MMU 1460 #ifdef CONFIG_FILE_LOCKING 1461 { 1462 .procname = "lease-break-time", 1463 .data = &lease_break_time, 1464 .maxlen = sizeof(int), 1465 .mode = 0644, 1466 .proc_handler = proc_dointvec, 1467 }, 1468 #endif 1469 #ifdef CONFIG_AIO 1470 { 1471 .procname = "aio-nr", 1472 .data = &aio_nr, 1473 .maxlen = sizeof(aio_nr), 1474 .mode = 0444, 1475 .proc_handler = proc_doulongvec_minmax, 1476 }, 1477 { 1478 .procname = "aio-max-nr", 1479 .data = &aio_max_nr, 1480 .maxlen = sizeof(aio_max_nr), 1481 .mode = 0644, 1482 .proc_handler = proc_doulongvec_minmax, 1483 }, 1484 #endif /* CONFIG_AIO */ 1485 #ifdef CONFIG_INOTIFY_USER 1486 { 1487 .procname = "inotify", 1488 .mode = 0555, 1489 .child = inotify_table, 1490 }, 1491 #endif 1492 #ifdef CONFIG_EPOLL 1493 { 1494 .procname = "epoll", 1495 .mode = 0555, 1496 .child = epoll_table, 1497 }, 1498 #endif 1499 #endif 1500 { 1501 .procname = "protected_symlinks", 1502 .data = &sysctl_protected_symlinks, 1503 .maxlen = sizeof(int), 1504 .mode = 0600, 1505 .proc_handler = proc_dointvec_minmax, 1506 .extra1 = &zero, 1507 .extra2 = &one, 1508 }, 1509 { 1510 .procname = "protected_hardlinks", 1511 .data = &sysctl_protected_hardlinks, 1512 .maxlen = sizeof(int), 1513 .mode = 0600, 1514 .proc_handler = proc_dointvec_minmax, 1515 .extra1 = &zero, 1516 .extra2 = &one, 1517 }, 1518 { 1519 .procname = "suid_dumpable", 1520 .data = &suid_dumpable, 1521 .maxlen = sizeof(int), 1522 .mode = 0644, 1523 .proc_handler = proc_dointvec_minmax_coredump, 1524 .extra1 = &zero, 1525 .extra2 = &two, 1526 }, 1527 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1528 { 1529 .procname = "binfmt_misc", 1530 .mode = 0555, 1531 .child = binfmt_misc_table, 1532 }, 1533 #endif 1534 { 1535 .procname = "pipe-max-size", 1536 .data = &pipe_max_size, 1537 .maxlen = sizeof(int), 1538 .mode = 0644, 1539 .proc_handler = &pipe_proc_fn, 1540 .extra1 = &pipe_min_size, 1541 }, 1542 { } 1543 }; 1544 1545 static struct ctl_table debug_table[] = { 1546 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1547 defined(CONFIG_S390) || defined(CONFIG_TILE) 1548 { 1549 .procname = "exception-trace", 1550 .data = &show_unhandled_signals, 1551 .maxlen = sizeof(int), 1552 .mode = 0644, 1553 .proc_handler = proc_dointvec 1554 }, 1555 #endif 1556 #if defined(CONFIG_OPTPROBES) 1557 { 1558 .procname = "kprobes-optimization", 1559 .data = &sysctl_kprobes_optimization, 1560 .maxlen = sizeof(int), 1561 .mode = 0644, 1562 .proc_handler = proc_kprobes_optimization_handler, 1563 .extra1 = &zero, 1564 .extra2 = &one, 1565 }, 1566 #endif 1567 { } 1568 }; 1569 1570 static struct ctl_table dev_table[] = { 1571 { } 1572 }; 1573 1574 int __init sysctl_init(void) 1575 { 1576 struct ctl_table_header *hdr; 1577 1578 hdr = register_sysctl_table(sysctl_base_table); 1579 kmemleak_not_leak(hdr); 1580 return 0; 1581 } 1582 1583 #endif /* CONFIG_SYSCTL */ 1584 1585 /* 1586 * /proc/sys support 1587 */ 1588 1589 #ifdef CONFIG_PROC_SYSCTL 1590 1591 static int _proc_do_string(void* data, int maxlen, int write, 1592 void __user *buffer, 1593 size_t *lenp, loff_t *ppos) 1594 { 1595 size_t len; 1596 char __user *p; 1597 char c; 1598 1599 if (!data || !maxlen || !*lenp) { 1600 *lenp = 0; 1601 return 0; 1602 } 1603 1604 if (write) { 1605 len = 0; 1606 p = buffer; 1607 while (len < *lenp) { 1608 if (get_user(c, p++)) 1609 return -EFAULT; 1610 if (c == 0 || c == '\n') 1611 break; 1612 len++; 1613 } 1614 if (len >= maxlen) 1615 len = maxlen-1; 1616 if(copy_from_user(data, buffer, len)) 1617 return -EFAULT; 1618 ((char *) data)[len] = 0; 1619 *ppos += *lenp; 1620 } else { 1621 len = strlen(data); 1622 if (len > maxlen) 1623 len = maxlen; 1624 1625 if (*ppos > len) { 1626 *lenp = 0; 1627 return 0; 1628 } 1629 1630 data += *ppos; 1631 len -= *ppos; 1632 1633 if (len > *lenp) 1634 len = *lenp; 1635 if (len) 1636 if(copy_to_user(buffer, data, len)) 1637 return -EFAULT; 1638 if (len < *lenp) { 1639 if(put_user('\n', ((char __user *) buffer) + len)) 1640 return -EFAULT; 1641 len++; 1642 } 1643 *lenp = len; 1644 *ppos += len; 1645 } 1646 return 0; 1647 } 1648 1649 /** 1650 * proc_dostring - read a string sysctl 1651 * @table: the sysctl table 1652 * @write: %TRUE if this is a write to the sysctl file 1653 * @buffer: the user buffer 1654 * @lenp: the size of the user buffer 1655 * @ppos: file position 1656 * 1657 * Reads/writes a string from/to the user buffer. If the kernel 1658 * buffer provided is not large enough to hold the string, the 1659 * string is truncated. The copied string is %NULL-terminated. 1660 * If the string is being read by the user process, it is copied 1661 * and a newline '\n' is added. It is truncated if the buffer is 1662 * not large enough. 1663 * 1664 * Returns 0 on success. 1665 */ 1666 int proc_dostring(struct ctl_table *table, int write, 1667 void __user *buffer, size_t *lenp, loff_t *ppos) 1668 { 1669 return _proc_do_string(table->data, table->maxlen, write, 1670 buffer, lenp, ppos); 1671 } 1672 1673 static size_t proc_skip_spaces(char **buf) 1674 { 1675 size_t ret; 1676 char *tmp = skip_spaces(*buf); 1677 ret = tmp - *buf; 1678 *buf = tmp; 1679 return ret; 1680 } 1681 1682 static void proc_skip_char(char **buf, size_t *size, const char v) 1683 { 1684 while (*size) { 1685 if (**buf != v) 1686 break; 1687 (*size)--; 1688 (*buf)++; 1689 } 1690 } 1691 1692 #define TMPBUFLEN 22 1693 /** 1694 * proc_get_long - reads an ASCII formatted integer from a user buffer 1695 * 1696 * @buf: a kernel buffer 1697 * @size: size of the kernel buffer 1698 * @val: this is where the number will be stored 1699 * @neg: set to %TRUE if number is negative 1700 * @perm_tr: a vector which contains the allowed trailers 1701 * @perm_tr_len: size of the perm_tr vector 1702 * @tr: pointer to store the trailer character 1703 * 1704 * In case of success %0 is returned and @buf and @size are updated with 1705 * the amount of bytes read. If @tr is non-NULL and a trailing 1706 * character exists (size is non-zero after returning from this 1707 * function), @tr is updated with the trailing character. 1708 */ 1709 static int proc_get_long(char **buf, size_t *size, 1710 unsigned long *val, bool *neg, 1711 const char *perm_tr, unsigned perm_tr_len, char *tr) 1712 { 1713 int len; 1714 char *p, tmp[TMPBUFLEN]; 1715 1716 if (!*size) 1717 return -EINVAL; 1718 1719 len = *size; 1720 if (len > TMPBUFLEN - 1) 1721 len = TMPBUFLEN - 1; 1722 1723 memcpy(tmp, *buf, len); 1724 1725 tmp[len] = 0; 1726 p = tmp; 1727 if (*p == '-' && *size > 1) { 1728 *neg = true; 1729 p++; 1730 } else 1731 *neg = false; 1732 if (!isdigit(*p)) 1733 return -EINVAL; 1734 1735 *val = simple_strtoul(p, &p, 0); 1736 1737 len = p - tmp; 1738 1739 /* We don't know if the next char is whitespace thus we may accept 1740 * invalid integers (e.g. 1234...a) or two integers instead of one 1741 * (e.g. 123...1). So lets not allow such large numbers. */ 1742 if (len == TMPBUFLEN - 1) 1743 return -EINVAL; 1744 1745 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1746 return -EINVAL; 1747 1748 if (tr && (len < *size)) 1749 *tr = *p; 1750 1751 *buf += len; 1752 *size -= len; 1753 1754 return 0; 1755 } 1756 1757 /** 1758 * proc_put_long - converts an integer to a decimal ASCII formatted string 1759 * 1760 * @buf: the user buffer 1761 * @size: the size of the user buffer 1762 * @val: the integer to be converted 1763 * @neg: sign of the number, %TRUE for negative 1764 * 1765 * In case of success %0 is returned and @buf and @size are updated with 1766 * the amount of bytes written. 1767 */ 1768 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1769 bool neg) 1770 { 1771 int len; 1772 char tmp[TMPBUFLEN], *p = tmp; 1773 1774 sprintf(p, "%s%lu", neg ? "-" : "", val); 1775 len = strlen(tmp); 1776 if (len > *size) 1777 len = *size; 1778 if (copy_to_user(*buf, tmp, len)) 1779 return -EFAULT; 1780 *size -= len; 1781 *buf += len; 1782 return 0; 1783 } 1784 #undef TMPBUFLEN 1785 1786 static int proc_put_char(void __user **buf, size_t *size, char c) 1787 { 1788 if (*size) { 1789 char __user **buffer = (char __user **)buf; 1790 if (put_user(c, *buffer)) 1791 return -EFAULT; 1792 (*size)--, (*buffer)++; 1793 *buf = *buffer; 1794 } 1795 return 0; 1796 } 1797 1798 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1799 int *valp, 1800 int write, void *data) 1801 { 1802 if (write) { 1803 *valp = *negp ? -*lvalp : *lvalp; 1804 } else { 1805 int val = *valp; 1806 if (val < 0) { 1807 *negp = true; 1808 *lvalp = (unsigned long)-val; 1809 } else { 1810 *negp = false; 1811 *lvalp = (unsigned long)val; 1812 } 1813 } 1814 return 0; 1815 } 1816 1817 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1818 1819 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1820 int write, void __user *buffer, 1821 size_t *lenp, loff_t *ppos, 1822 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1823 int write, void *data), 1824 void *data) 1825 { 1826 int *i, vleft, first = 1, err = 0; 1827 unsigned long page = 0; 1828 size_t left; 1829 char *kbuf; 1830 1831 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1832 *lenp = 0; 1833 return 0; 1834 } 1835 1836 i = (int *) tbl_data; 1837 vleft = table->maxlen / sizeof(*i); 1838 left = *lenp; 1839 1840 if (!conv) 1841 conv = do_proc_dointvec_conv; 1842 1843 if (write) { 1844 if (left > PAGE_SIZE - 1) 1845 left = PAGE_SIZE - 1; 1846 page = __get_free_page(GFP_TEMPORARY); 1847 kbuf = (char *) page; 1848 if (!kbuf) 1849 return -ENOMEM; 1850 if (copy_from_user(kbuf, buffer, left)) { 1851 err = -EFAULT; 1852 goto free; 1853 } 1854 kbuf[left] = 0; 1855 } 1856 1857 for (; left && vleft--; i++, first=0) { 1858 unsigned long lval; 1859 bool neg; 1860 1861 if (write) { 1862 left -= proc_skip_spaces(&kbuf); 1863 1864 if (!left) 1865 break; 1866 err = proc_get_long(&kbuf, &left, &lval, &neg, 1867 proc_wspace_sep, 1868 sizeof(proc_wspace_sep), NULL); 1869 if (err) 1870 break; 1871 if (conv(&neg, &lval, i, 1, data)) { 1872 err = -EINVAL; 1873 break; 1874 } 1875 } else { 1876 if (conv(&neg, &lval, i, 0, data)) { 1877 err = -EINVAL; 1878 break; 1879 } 1880 if (!first) 1881 err = proc_put_char(&buffer, &left, '\t'); 1882 if (err) 1883 break; 1884 err = proc_put_long(&buffer, &left, lval, neg); 1885 if (err) 1886 break; 1887 } 1888 } 1889 1890 if (!write && !first && left && !err) 1891 err = proc_put_char(&buffer, &left, '\n'); 1892 if (write && !err && left) 1893 left -= proc_skip_spaces(&kbuf); 1894 free: 1895 if (write) { 1896 free_page(page); 1897 if (first) 1898 return err ? : -EINVAL; 1899 } 1900 *lenp -= left; 1901 *ppos += *lenp; 1902 return err; 1903 } 1904 1905 static int do_proc_dointvec(struct ctl_table *table, int write, 1906 void __user *buffer, size_t *lenp, loff_t *ppos, 1907 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1908 int write, void *data), 1909 void *data) 1910 { 1911 return __do_proc_dointvec(table->data, table, write, 1912 buffer, lenp, ppos, conv, data); 1913 } 1914 1915 /** 1916 * proc_dointvec - read a vector of integers 1917 * @table: the sysctl table 1918 * @write: %TRUE if this is a write to the sysctl file 1919 * @buffer: the user buffer 1920 * @lenp: the size of the user buffer 1921 * @ppos: file position 1922 * 1923 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1924 * values from/to the user buffer, treated as an ASCII string. 1925 * 1926 * Returns 0 on success. 1927 */ 1928 int proc_dointvec(struct ctl_table *table, int write, 1929 void __user *buffer, size_t *lenp, loff_t *ppos) 1930 { 1931 return do_proc_dointvec(table,write,buffer,lenp,ppos, 1932 NULL,NULL); 1933 } 1934 1935 /* 1936 * Taint values can only be increased 1937 * This means we can safely use a temporary. 1938 */ 1939 static int proc_taint(struct ctl_table *table, int write, 1940 void __user *buffer, size_t *lenp, loff_t *ppos) 1941 { 1942 struct ctl_table t; 1943 unsigned long tmptaint = get_taint(); 1944 int err; 1945 1946 if (write && !capable(CAP_SYS_ADMIN)) 1947 return -EPERM; 1948 1949 t = *table; 1950 t.data = &tmptaint; 1951 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 1952 if (err < 0) 1953 return err; 1954 1955 if (write) { 1956 /* 1957 * Poor man's atomic or. Not worth adding a primitive 1958 * to everyone's atomic.h for this 1959 */ 1960 int i; 1961 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 1962 if ((tmptaint >> i) & 1) 1963 add_taint(i); 1964 } 1965 } 1966 1967 return err; 1968 } 1969 1970 #ifdef CONFIG_PRINTK 1971 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 1972 void __user *buffer, size_t *lenp, loff_t *ppos) 1973 { 1974 if (write && !capable(CAP_SYS_ADMIN)) 1975 return -EPERM; 1976 1977 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 1978 } 1979 #endif 1980 1981 struct do_proc_dointvec_minmax_conv_param { 1982 int *min; 1983 int *max; 1984 }; 1985 1986 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 1987 int *valp, 1988 int write, void *data) 1989 { 1990 struct do_proc_dointvec_minmax_conv_param *param = data; 1991 if (write) { 1992 int val = *negp ? -*lvalp : *lvalp; 1993 if ((param->min && *param->min > val) || 1994 (param->max && *param->max < val)) 1995 return -EINVAL; 1996 *valp = val; 1997 } else { 1998 int val = *valp; 1999 if (val < 0) { 2000 *negp = true; 2001 *lvalp = (unsigned long)-val; 2002 } else { 2003 *negp = false; 2004 *lvalp = (unsigned long)val; 2005 } 2006 } 2007 return 0; 2008 } 2009 2010 /** 2011 * proc_dointvec_minmax - read a vector of integers with min/max values 2012 * @table: the sysctl table 2013 * @write: %TRUE if this is a write to the sysctl file 2014 * @buffer: the user buffer 2015 * @lenp: the size of the user buffer 2016 * @ppos: file position 2017 * 2018 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2019 * values from/to the user buffer, treated as an ASCII string. 2020 * 2021 * This routine will ensure the values are within the range specified by 2022 * table->extra1 (min) and table->extra2 (max). 2023 * 2024 * Returns 0 on success. 2025 */ 2026 int proc_dointvec_minmax(struct ctl_table *table, int write, 2027 void __user *buffer, size_t *lenp, loff_t *ppos) 2028 { 2029 struct do_proc_dointvec_minmax_conv_param param = { 2030 .min = (int *) table->extra1, 2031 .max = (int *) table->extra2, 2032 }; 2033 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2034 do_proc_dointvec_minmax_conv, ¶m); 2035 } 2036 2037 static void validate_coredump_safety(void) 2038 { 2039 if (suid_dumpable == SUID_DUMPABLE_SAFE && 2040 core_pattern[0] != '/' && core_pattern[0] != '|') { 2041 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2042 "suid_dumpable=2. Pipe handler or fully qualified "\ 2043 "core dump path required.\n"); 2044 } 2045 } 2046 2047 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2048 void __user *buffer, size_t *lenp, loff_t *ppos) 2049 { 2050 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2051 if (!error) 2052 validate_coredump_safety(); 2053 return error; 2054 } 2055 2056 static int proc_dostring_coredump(struct ctl_table *table, int write, 2057 void __user *buffer, size_t *lenp, loff_t *ppos) 2058 { 2059 int error = proc_dostring(table, write, buffer, lenp, ppos); 2060 if (!error) 2061 validate_coredump_safety(); 2062 return error; 2063 } 2064 2065 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2066 void __user *buffer, 2067 size_t *lenp, loff_t *ppos, 2068 unsigned long convmul, 2069 unsigned long convdiv) 2070 { 2071 unsigned long *i, *min, *max; 2072 int vleft, first = 1, err = 0; 2073 unsigned long page = 0; 2074 size_t left; 2075 char *kbuf; 2076 2077 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2078 *lenp = 0; 2079 return 0; 2080 } 2081 2082 i = (unsigned long *) data; 2083 min = (unsigned long *) table->extra1; 2084 max = (unsigned long *) table->extra2; 2085 vleft = table->maxlen / sizeof(unsigned long); 2086 left = *lenp; 2087 2088 if (write) { 2089 if (left > PAGE_SIZE - 1) 2090 left = PAGE_SIZE - 1; 2091 page = __get_free_page(GFP_TEMPORARY); 2092 kbuf = (char *) page; 2093 if (!kbuf) 2094 return -ENOMEM; 2095 if (copy_from_user(kbuf, buffer, left)) { 2096 err = -EFAULT; 2097 goto free; 2098 } 2099 kbuf[left] = 0; 2100 } 2101 2102 for (; left && vleft--; i++, first = 0) { 2103 unsigned long val; 2104 2105 if (write) { 2106 bool neg; 2107 2108 left -= proc_skip_spaces(&kbuf); 2109 2110 err = proc_get_long(&kbuf, &left, &val, &neg, 2111 proc_wspace_sep, 2112 sizeof(proc_wspace_sep), NULL); 2113 if (err) 2114 break; 2115 if (neg) 2116 continue; 2117 if ((min && val < *min) || (max && val > *max)) 2118 continue; 2119 *i = val; 2120 } else { 2121 val = convdiv * (*i) / convmul; 2122 if (!first) 2123 err = proc_put_char(&buffer, &left, '\t'); 2124 err = proc_put_long(&buffer, &left, val, false); 2125 if (err) 2126 break; 2127 } 2128 } 2129 2130 if (!write && !first && left && !err) 2131 err = proc_put_char(&buffer, &left, '\n'); 2132 if (write && !err) 2133 left -= proc_skip_spaces(&kbuf); 2134 free: 2135 if (write) { 2136 free_page(page); 2137 if (first) 2138 return err ? : -EINVAL; 2139 } 2140 *lenp -= left; 2141 *ppos += *lenp; 2142 return err; 2143 } 2144 2145 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2146 void __user *buffer, 2147 size_t *lenp, loff_t *ppos, 2148 unsigned long convmul, 2149 unsigned long convdiv) 2150 { 2151 return __do_proc_doulongvec_minmax(table->data, table, write, 2152 buffer, lenp, ppos, convmul, convdiv); 2153 } 2154 2155 /** 2156 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2157 * @table: the sysctl table 2158 * @write: %TRUE if this is a write to the sysctl file 2159 * @buffer: the user buffer 2160 * @lenp: the size of the user buffer 2161 * @ppos: file position 2162 * 2163 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2164 * values from/to the user buffer, treated as an ASCII string. 2165 * 2166 * This routine will ensure the values are within the range specified by 2167 * table->extra1 (min) and table->extra2 (max). 2168 * 2169 * Returns 0 on success. 2170 */ 2171 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2172 void __user *buffer, size_t *lenp, loff_t *ppos) 2173 { 2174 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2175 } 2176 2177 /** 2178 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2179 * @table: the sysctl table 2180 * @write: %TRUE if this is a write to the sysctl file 2181 * @buffer: the user buffer 2182 * @lenp: the size of the user buffer 2183 * @ppos: file position 2184 * 2185 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2186 * values from/to the user buffer, treated as an ASCII string. The values 2187 * are treated as milliseconds, and converted to jiffies when they are stored. 2188 * 2189 * This routine will ensure the values are within the range specified by 2190 * table->extra1 (min) and table->extra2 (max). 2191 * 2192 * Returns 0 on success. 2193 */ 2194 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2195 void __user *buffer, 2196 size_t *lenp, loff_t *ppos) 2197 { 2198 return do_proc_doulongvec_minmax(table, write, buffer, 2199 lenp, ppos, HZ, 1000l); 2200 } 2201 2202 2203 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2204 int *valp, 2205 int write, void *data) 2206 { 2207 if (write) { 2208 if (*lvalp > LONG_MAX / HZ) 2209 return 1; 2210 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2211 } else { 2212 int val = *valp; 2213 unsigned long lval; 2214 if (val < 0) { 2215 *negp = true; 2216 lval = (unsigned long)-val; 2217 } else { 2218 *negp = false; 2219 lval = (unsigned long)val; 2220 } 2221 *lvalp = lval / HZ; 2222 } 2223 return 0; 2224 } 2225 2226 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2227 int *valp, 2228 int write, void *data) 2229 { 2230 if (write) { 2231 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2232 return 1; 2233 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2234 } else { 2235 int val = *valp; 2236 unsigned long lval; 2237 if (val < 0) { 2238 *negp = true; 2239 lval = (unsigned long)-val; 2240 } else { 2241 *negp = false; 2242 lval = (unsigned long)val; 2243 } 2244 *lvalp = jiffies_to_clock_t(lval); 2245 } 2246 return 0; 2247 } 2248 2249 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2250 int *valp, 2251 int write, void *data) 2252 { 2253 if (write) { 2254 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2255 } else { 2256 int val = *valp; 2257 unsigned long lval; 2258 if (val < 0) { 2259 *negp = true; 2260 lval = (unsigned long)-val; 2261 } else { 2262 *negp = false; 2263 lval = (unsigned long)val; 2264 } 2265 *lvalp = jiffies_to_msecs(lval); 2266 } 2267 return 0; 2268 } 2269 2270 /** 2271 * proc_dointvec_jiffies - read a vector of integers as seconds 2272 * @table: the sysctl table 2273 * @write: %TRUE if this is a write to the sysctl file 2274 * @buffer: the user buffer 2275 * @lenp: the size of the user buffer 2276 * @ppos: file position 2277 * 2278 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2279 * values from/to the user buffer, treated as an ASCII string. 2280 * The values read are assumed to be in seconds, and are converted into 2281 * jiffies. 2282 * 2283 * Returns 0 on success. 2284 */ 2285 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2286 void __user *buffer, size_t *lenp, loff_t *ppos) 2287 { 2288 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2289 do_proc_dointvec_jiffies_conv,NULL); 2290 } 2291 2292 /** 2293 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2294 * @table: the sysctl table 2295 * @write: %TRUE if this is a write to the sysctl file 2296 * @buffer: the user buffer 2297 * @lenp: the size of the user buffer 2298 * @ppos: pointer to the file position 2299 * 2300 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2301 * values from/to the user buffer, treated as an ASCII string. 2302 * The values read are assumed to be in 1/USER_HZ seconds, and 2303 * are converted into jiffies. 2304 * 2305 * Returns 0 on success. 2306 */ 2307 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2308 void __user *buffer, size_t *lenp, loff_t *ppos) 2309 { 2310 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2311 do_proc_dointvec_userhz_jiffies_conv,NULL); 2312 } 2313 2314 /** 2315 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2316 * @table: the sysctl table 2317 * @write: %TRUE if this is a write to the sysctl file 2318 * @buffer: the user buffer 2319 * @lenp: the size of the user buffer 2320 * @ppos: file position 2321 * @ppos: the current position in the file 2322 * 2323 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2324 * values from/to the user buffer, treated as an ASCII string. 2325 * The values read are assumed to be in 1/1000 seconds, and 2326 * are converted into jiffies. 2327 * 2328 * Returns 0 on success. 2329 */ 2330 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2331 void __user *buffer, size_t *lenp, loff_t *ppos) 2332 { 2333 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2334 do_proc_dointvec_ms_jiffies_conv, NULL); 2335 } 2336 2337 static int proc_do_cad_pid(struct ctl_table *table, int write, 2338 void __user *buffer, size_t *lenp, loff_t *ppos) 2339 { 2340 struct pid *new_pid; 2341 pid_t tmp; 2342 int r; 2343 2344 tmp = pid_vnr(cad_pid); 2345 2346 r = __do_proc_dointvec(&tmp, table, write, buffer, 2347 lenp, ppos, NULL, NULL); 2348 if (r || !write) 2349 return r; 2350 2351 new_pid = find_get_pid(tmp); 2352 if (!new_pid) 2353 return -ESRCH; 2354 2355 put_pid(xchg(&cad_pid, new_pid)); 2356 return 0; 2357 } 2358 2359 /** 2360 * proc_do_large_bitmap - read/write from/to a large bitmap 2361 * @table: the sysctl table 2362 * @write: %TRUE if this is a write to the sysctl file 2363 * @buffer: the user buffer 2364 * @lenp: the size of the user buffer 2365 * @ppos: file position 2366 * 2367 * The bitmap is stored at table->data and the bitmap length (in bits) 2368 * in table->maxlen. 2369 * 2370 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2371 * large bitmaps may be represented in a compact manner. Writing into 2372 * the file will clear the bitmap then update it with the given input. 2373 * 2374 * Returns 0 on success. 2375 */ 2376 int proc_do_large_bitmap(struct ctl_table *table, int write, 2377 void __user *buffer, size_t *lenp, loff_t *ppos) 2378 { 2379 int err = 0; 2380 bool first = 1; 2381 size_t left = *lenp; 2382 unsigned long bitmap_len = table->maxlen; 2383 unsigned long *bitmap = (unsigned long *) table->data; 2384 unsigned long *tmp_bitmap = NULL; 2385 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2386 2387 if (!bitmap_len || !left || (*ppos && !write)) { 2388 *lenp = 0; 2389 return 0; 2390 } 2391 2392 if (write) { 2393 unsigned long page = 0; 2394 char *kbuf; 2395 2396 if (left > PAGE_SIZE - 1) 2397 left = PAGE_SIZE - 1; 2398 2399 page = __get_free_page(GFP_TEMPORARY); 2400 kbuf = (char *) page; 2401 if (!kbuf) 2402 return -ENOMEM; 2403 if (copy_from_user(kbuf, buffer, left)) { 2404 free_page(page); 2405 return -EFAULT; 2406 } 2407 kbuf[left] = 0; 2408 2409 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2410 GFP_KERNEL); 2411 if (!tmp_bitmap) { 2412 free_page(page); 2413 return -ENOMEM; 2414 } 2415 proc_skip_char(&kbuf, &left, '\n'); 2416 while (!err && left) { 2417 unsigned long val_a, val_b; 2418 bool neg; 2419 2420 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2421 sizeof(tr_a), &c); 2422 if (err) 2423 break; 2424 if (val_a >= bitmap_len || neg) { 2425 err = -EINVAL; 2426 break; 2427 } 2428 2429 val_b = val_a; 2430 if (left) { 2431 kbuf++; 2432 left--; 2433 } 2434 2435 if (c == '-') { 2436 err = proc_get_long(&kbuf, &left, &val_b, 2437 &neg, tr_b, sizeof(tr_b), 2438 &c); 2439 if (err) 2440 break; 2441 if (val_b >= bitmap_len || neg || 2442 val_a > val_b) { 2443 err = -EINVAL; 2444 break; 2445 } 2446 if (left) { 2447 kbuf++; 2448 left--; 2449 } 2450 } 2451 2452 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2453 first = 0; 2454 proc_skip_char(&kbuf, &left, '\n'); 2455 } 2456 free_page(page); 2457 } else { 2458 unsigned long bit_a, bit_b = 0; 2459 2460 while (left) { 2461 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2462 if (bit_a >= bitmap_len) 2463 break; 2464 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2465 bit_a + 1) - 1; 2466 2467 if (!first) { 2468 err = proc_put_char(&buffer, &left, ','); 2469 if (err) 2470 break; 2471 } 2472 err = proc_put_long(&buffer, &left, bit_a, false); 2473 if (err) 2474 break; 2475 if (bit_a != bit_b) { 2476 err = proc_put_char(&buffer, &left, '-'); 2477 if (err) 2478 break; 2479 err = proc_put_long(&buffer, &left, bit_b, false); 2480 if (err) 2481 break; 2482 } 2483 2484 first = 0; bit_b++; 2485 } 2486 if (!err) 2487 err = proc_put_char(&buffer, &left, '\n'); 2488 } 2489 2490 if (!err) { 2491 if (write) { 2492 if (*ppos) 2493 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2494 else 2495 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2496 } 2497 kfree(tmp_bitmap); 2498 *lenp -= left; 2499 *ppos += *lenp; 2500 return 0; 2501 } else { 2502 kfree(tmp_bitmap); 2503 return err; 2504 } 2505 } 2506 2507 #else /* CONFIG_PROC_SYSCTL */ 2508 2509 int proc_dostring(struct ctl_table *table, int write, 2510 void __user *buffer, size_t *lenp, loff_t *ppos) 2511 { 2512 return -ENOSYS; 2513 } 2514 2515 int proc_dointvec(struct ctl_table *table, int write, 2516 void __user *buffer, size_t *lenp, loff_t *ppos) 2517 { 2518 return -ENOSYS; 2519 } 2520 2521 int proc_dointvec_minmax(struct ctl_table *table, int write, 2522 void __user *buffer, size_t *lenp, loff_t *ppos) 2523 { 2524 return -ENOSYS; 2525 } 2526 2527 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2528 void __user *buffer, size_t *lenp, loff_t *ppos) 2529 { 2530 return -ENOSYS; 2531 } 2532 2533 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2534 void __user *buffer, size_t *lenp, loff_t *ppos) 2535 { 2536 return -ENOSYS; 2537 } 2538 2539 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2540 void __user *buffer, size_t *lenp, loff_t *ppos) 2541 { 2542 return -ENOSYS; 2543 } 2544 2545 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2546 void __user *buffer, size_t *lenp, loff_t *ppos) 2547 { 2548 return -ENOSYS; 2549 } 2550 2551 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2552 void __user *buffer, 2553 size_t *lenp, loff_t *ppos) 2554 { 2555 return -ENOSYS; 2556 } 2557 2558 2559 #endif /* CONFIG_PROC_SYSCTL */ 2560 2561 /* 2562 * No sense putting this after each symbol definition, twice, 2563 * exception granted :-) 2564 */ 2565 EXPORT_SYMBOL(proc_dointvec); 2566 EXPORT_SYMBOL(proc_dointvec_jiffies); 2567 EXPORT_SYMBOL(proc_dointvec_minmax); 2568 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2569 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2570 EXPORT_SYMBOL(proc_dostring); 2571 EXPORT_SYMBOL(proc_doulongvec_minmax); 2572 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2573