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