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 #include <linux/sched/sysctl.h> 65 66 #include <asm/uaccess.h> 67 #include <asm/processor.h> 68 69 #ifdef CONFIG_X86 70 #include <asm/nmi.h> 71 #include <asm/stacktrace.h> 72 #include <asm/io.h> 73 #endif 74 #ifdef CONFIG_SPARC 75 #include <asm/setup.h> 76 #endif 77 #ifdef CONFIG_BSD_PROCESS_ACCT 78 #include <linux/acct.h> 79 #endif 80 #ifdef CONFIG_RT_MUTEXES 81 #include <linux/rtmutex.h> 82 #endif 83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 84 #include <linux/lockdep.h> 85 #endif 86 #ifdef CONFIG_CHR_DEV_SG 87 #include <scsi/sg.h> 88 #endif 89 90 #ifdef CONFIG_LOCKUP_DETECTOR 91 #include <linux/nmi.h> 92 #endif 93 94 95 #if defined(CONFIG_SYSCTL) 96 97 /* External variables not in a header file. */ 98 extern int sysctl_overcommit_memory; 99 extern int sysctl_overcommit_ratio; 100 extern int max_threads; 101 extern int suid_dumpable; 102 #ifdef CONFIG_COREDUMP 103 extern int core_uses_pid; 104 extern char core_pattern[]; 105 extern unsigned int core_pipe_limit; 106 #endif 107 extern int pid_max; 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 #endif 161 162 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 163 extern int unaligned_enabled; 164 #endif 165 166 #ifdef CONFIG_IA64 167 extern int unaligned_dump_stack; 168 #endif 169 170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 171 extern int no_unaligned_warning; 172 #endif 173 174 #ifdef CONFIG_PROC_SYSCTL 175 static int proc_do_cad_pid(struct ctl_table *table, int write, 176 void __user *buffer, size_t *lenp, loff_t *ppos); 177 static int proc_taint(struct ctl_table *table, int write, 178 void __user *buffer, size_t *lenp, loff_t *ppos); 179 #endif 180 181 #ifdef CONFIG_PRINTK 182 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 183 void __user *buffer, size_t *lenp, loff_t *ppos); 184 #endif 185 186 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 187 void __user *buffer, size_t *lenp, loff_t *ppos); 188 #ifdef CONFIG_COREDUMP 189 static int proc_dostring_coredump(struct ctl_table *table, int write, 190 void __user *buffer, size_t *lenp, loff_t *ppos); 191 #endif 192 193 #ifdef CONFIG_MAGIC_SYSRQ 194 /* Note: sysrq code uses it's own private copy */ 195 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 196 197 static int sysrq_sysctl_handler(ctl_table *table, int write, 198 void __user *buffer, size_t *lenp, 199 loff_t *ppos) 200 { 201 int error; 202 203 error = proc_dointvec(table, write, buffer, lenp, ppos); 204 if (error) 205 return error; 206 207 if (write) 208 sysrq_toggle_support(__sysrq_enabled); 209 210 return 0; 211 } 212 213 #endif 214 215 static struct ctl_table kern_table[]; 216 static struct ctl_table vm_table[]; 217 static struct ctl_table fs_table[]; 218 static struct ctl_table debug_table[]; 219 static struct ctl_table dev_table[]; 220 extern struct ctl_table random_table[]; 221 #ifdef CONFIG_EPOLL 222 extern struct ctl_table epoll_table[]; 223 #endif 224 225 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 226 int sysctl_legacy_va_layout; 227 #endif 228 229 /* The default sysctl tables: */ 230 231 static struct ctl_table sysctl_base_table[] = { 232 { 233 .procname = "kernel", 234 .mode = 0555, 235 .child = kern_table, 236 }, 237 { 238 .procname = "vm", 239 .mode = 0555, 240 .child = vm_table, 241 }, 242 { 243 .procname = "fs", 244 .mode = 0555, 245 .child = fs_table, 246 }, 247 { 248 .procname = "debug", 249 .mode = 0555, 250 .child = debug_table, 251 }, 252 { 253 .procname = "dev", 254 .mode = 0555, 255 .child = dev_table, 256 }, 257 { } 258 }; 259 260 #ifdef CONFIG_SCHED_DEBUG 261 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 262 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 263 static int min_wakeup_granularity_ns; /* 0 usecs */ 264 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 265 #ifdef CONFIG_SMP 266 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 267 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 268 #endif /* CONFIG_SMP */ 269 #endif /* CONFIG_SCHED_DEBUG */ 270 271 #ifdef CONFIG_COMPACTION 272 static int min_extfrag_threshold; 273 static int max_extfrag_threshold = 1000; 274 #endif 275 276 static struct ctl_table kern_table[] = { 277 { 278 .procname = "sched_child_runs_first", 279 .data = &sysctl_sched_child_runs_first, 280 .maxlen = sizeof(unsigned int), 281 .mode = 0644, 282 .proc_handler = proc_dointvec, 283 }, 284 #ifdef CONFIG_SCHED_DEBUG 285 { 286 .procname = "sched_min_granularity_ns", 287 .data = &sysctl_sched_min_granularity, 288 .maxlen = sizeof(unsigned int), 289 .mode = 0644, 290 .proc_handler = sched_proc_update_handler, 291 .extra1 = &min_sched_granularity_ns, 292 .extra2 = &max_sched_granularity_ns, 293 }, 294 { 295 .procname = "sched_latency_ns", 296 .data = &sysctl_sched_latency, 297 .maxlen = sizeof(unsigned int), 298 .mode = 0644, 299 .proc_handler = sched_proc_update_handler, 300 .extra1 = &min_sched_granularity_ns, 301 .extra2 = &max_sched_granularity_ns, 302 }, 303 { 304 .procname = "sched_wakeup_granularity_ns", 305 .data = &sysctl_sched_wakeup_granularity, 306 .maxlen = sizeof(unsigned int), 307 .mode = 0644, 308 .proc_handler = sched_proc_update_handler, 309 .extra1 = &min_wakeup_granularity_ns, 310 .extra2 = &max_wakeup_granularity_ns, 311 }, 312 #ifdef CONFIG_SMP 313 { 314 .procname = "sched_tunable_scaling", 315 .data = &sysctl_sched_tunable_scaling, 316 .maxlen = sizeof(enum sched_tunable_scaling), 317 .mode = 0644, 318 .proc_handler = sched_proc_update_handler, 319 .extra1 = &min_sched_tunable_scaling, 320 .extra2 = &max_sched_tunable_scaling, 321 }, 322 { 323 .procname = "sched_migration_cost_ns", 324 .data = &sysctl_sched_migration_cost, 325 .maxlen = sizeof(unsigned int), 326 .mode = 0644, 327 .proc_handler = proc_dointvec, 328 }, 329 { 330 .procname = "sched_nr_migrate", 331 .data = &sysctl_sched_nr_migrate, 332 .maxlen = sizeof(unsigned int), 333 .mode = 0644, 334 .proc_handler = proc_dointvec, 335 }, 336 { 337 .procname = "sched_time_avg_ms", 338 .data = &sysctl_sched_time_avg, 339 .maxlen = sizeof(unsigned int), 340 .mode = 0644, 341 .proc_handler = proc_dointvec, 342 }, 343 { 344 .procname = "sched_shares_window_ns", 345 .data = &sysctl_sched_shares_window, 346 .maxlen = sizeof(unsigned int), 347 .mode = 0644, 348 .proc_handler = proc_dointvec, 349 }, 350 { 351 .procname = "timer_migration", 352 .data = &sysctl_timer_migration, 353 .maxlen = sizeof(unsigned int), 354 .mode = 0644, 355 .proc_handler = proc_dointvec_minmax, 356 .extra1 = &zero, 357 .extra2 = &one, 358 }, 359 #endif /* CONFIG_SMP */ 360 #ifdef CONFIG_NUMA_BALANCING 361 { 362 .procname = "numa_balancing_scan_delay_ms", 363 .data = &sysctl_numa_balancing_scan_delay, 364 .maxlen = sizeof(unsigned int), 365 .mode = 0644, 366 .proc_handler = proc_dointvec, 367 }, 368 { 369 .procname = "numa_balancing_scan_period_min_ms", 370 .data = &sysctl_numa_balancing_scan_period_min, 371 .maxlen = sizeof(unsigned int), 372 .mode = 0644, 373 .proc_handler = proc_dointvec, 374 }, 375 { 376 .procname = "numa_balancing_scan_period_reset", 377 .data = &sysctl_numa_balancing_scan_period_reset, 378 .maxlen = sizeof(unsigned int), 379 .mode = 0644, 380 .proc_handler = proc_dointvec, 381 }, 382 { 383 .procname = "numa_balancing_scan_period_max_ms", 384 .data = &sysctl_numa_balancing_scan_period_max, 385 .maxlen = sizeof(unsigned int), 386 .mode = 0644, 387 .proc_handler = proc_dointvec, 388 }, 389 { 390 .procname = "numa_balancing_scan_size_mb", 391 .data = &sysctl_numa_balancing_scan_size, 392 .maxlen = sizeof(unsigned int), 393 .mode = 0644, 394 .proc_handler = proc_dointvec, 395 }, 396 #endif /* CONFIG_NUMA_BALANCING */ 397 #endif /* CONFIG_SCHED_DEBUG */ 398 { 399 .procname = "sched_rt_period_us", 400 .data = &sysctl_sched_rt_period, 401 .maxlen = sizeof(unsigned int), 402 .mode = 0644, 403 .proc_handler = sched_rt_handler, 404 }, 405 { 406 .procname = "sched_rt_runtime_us", 407 .data = &sysctl_sched_rt_runtime, 408 .maxlen = sizeof(int), 409 .mode = 0644, 410 .proc_handler = sched_rt_handler, 411 }, 412 { 413 .procname = "sched_rr_timeslice_ms", 414 .data = &sched_rr_timeslice, 415 .maxlen = sizeof(int), 416 .mode = 0644, 417 .proc_handler = sched_rr_handler, 418 }, 419 #ifdef CONFIG_SCHED_AUTOGROUP 420 { 421 .procname = "sched_autogroup_enabled", 422 .data = &sysctl_sched_autogroup_enabled, 423 .maxlen = sizeof(unsigned int), 424 .mode = 0644, 425 .proc_handler = proc_dointvec_minmax, 426 .extra1 = &zero, 427 .extra2 = &one, 428 }, 429 #endif 430 #ifdef CONFIG_CFS_BANDWIDTH 431 { 432 .procname = "sched_cfs_bandwidth_slice_us", 433 .data = &sysctl_sched_cfs_bandwidth_slice, 434 .maxlen = sizeof(unsigned int), 435 .mode = 0644, 436 .proc_handler = proc_dointvec_minmax, 437 .extra1 = &one, 438 }, 439 #endif 440 #ifdef CONFIG_PROVE_LOCKING 441 { 442 .procname = "prove_locking", 443 .data = &prove_locking, 444 .maxlen = sizeof(int), 445 .mode = 0644, 446 .proc_handler = proc_dointvec, 447 }, 448 #endif 449 #ifdef CONFIG_LOCK_STAT 450 { 451 .procname = "lock_stat", 452 .data = &lock_stat, 453 .maxlen = sizeof(int), 454 .mode = 0644, 455 .proc_handler = proc_dointvec, 456 }, 457 #endif 458 { 459 .procname = "panic", 460 .data = &panic_timeout, 461 .maxlen = sizeof(int), 462 .mode = 0644, 463 .proc_handler = proc_dointvec, 464 }, 465 #ifdef CONFIG_COREDUMP 466 { 467 .procname = "core_uses_pid", 468 .data = &core_uses_pid, 469 .maxlen = sizeof(int), 470 .mode = 0644, 471 .proc_handler = proc_dointvec, 472 }, 473 { 474 .procname = "core_pattern", 475 .data = core_pattern, 476 .maxlen = CORENAME_MAX_SIZE, 477 .mode = 0644, 478 .proc_handler = proc_dostring_coredump, 479 }, 480 { 481 .procname = "core_pipe_limit", 482 .data = &core_pipe_limit, 483 .maxlen = sizeof(unsigned int), 484 .mode = 0644, 485 .proc_handler = proc_dointvec, 486 }, 487 #endif 488 #ifdef CONFIG_PROC_SYSCTL 489 { 490 .procname = "tainted", 491 .maxlen = sizeof(long), 492 .mode = 0644, 493 .proc_handler = proc_taint, 494 }, 495 #endif 496 #ifdef CONFIG_LATENCYTOP 497 { 498 .procname = "latencytop", 499 .data = &latencytop_enabled, 500 .maxlen = sizeof(int), 501 .mode = 0644, 502 .proc_handler = proc_dointvec, 503 }, 504 #endif 505 #ifdef CONFIG_BLK_DEV_INITRD 506 { 507 .procname = "real-root-dev", 508 .data = &real_root_dev, 509 .maxlen = sizeof(int), 510 .mode = 0644, 511 .proc_handler = proc_dointvec, 512 }, 513 #endif 514 { 515 .procname = "print-fatal-signals", 516 .data = &print_fatal_signals, 517 .maxlen = sizeof(int), 518 .mode = 0644, 519 .proc_handler = proc_dointvec, 520 }, 521 #ifdef CONFIG_SPARC 522 { 523 .procname = "reboot-cmd", 524 .data = reboot_command, 525 .maxlen = 256, 526 .mode = 0644, 527 .proc_handler = proc_dostring, 528 }, 529 { 530 .procname = "stop-a", 531 .data = &stop_a_enabled, 532 .maxlen = sizeof (int), 533 .mode = 0644, 534 .proc_handler = proc_dointvec, 535 }, 536 { 537 .procname = "scons-poweroff", 538 .data = &scons_pwroff, 539 .maxlen = sizeof (int), 540 .mode = 0644, 541 .proc_handler = proc_dointvec, 542 }, 543 #endif 544 #ifdef CONFIG_SPARC64 545 { 546 .procname = "tsb-ratio", 547 .data = &sysctl_tsb_ratio, 548 .maxlen = sizeof (int), 549 .mode = 0644, 550 .proc_handler = proc_dointvec, 551 }, 552 #endif 553 #ifdef __hppa__ 554 { 555 .procname = "soft-power", 556 .data = &pwrsw_enabled, 557 .maxlen = sizeof (int), 558 .mode = 0644, 559 .proc_handler = proc_dointvec, 560 }, 561 #endif 562 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 563 { 564 .procname = "unaligned-trap", 565 .data = &unaligned_enabled, 566 .maxlen = sizeof (int), 567 .mode = 0644, 568 .proc_handler = proc_dointvec, 569 }, 570 #endif 571 { 572 .procname = "ctrl-alt-del", 573 .data = &C_A_D, 574 .maxlen = sizeof(int), 575 .mode = 0644, 576 .proc_handler = proc_dointvec, 577 }, 578 #ifdef CONFIG_FUNCTION_TRACER 579 { 580 .procname = "ftrace_enabled", 581 .data = &ftrace_enabled, 582 .maxlen = sizeof(int), 583 .mode = 0644, 584 .proc_handler = ftrace_enable_sysctl, 585 }, 586 #endif 587 #ifdef CONFIG_STACK_TRACER 588 { 589 .procname = "stack_tracer_enabled", 590 .data = &stack_tracer_enabled, 591 .maxlen = sizeof(int), 592 .mode = 0644, 593 .proc_handler = stack_trace_sysctl, 594 }, 595 #endif 596 #ifdef CONFIG_TRACING 597 { 598 .procname = "ftrace_dump_on_oops", 599 .data = &ftrace_dump_on_oops, 600 .maxlen = sizeof(int), 601 .mode = 0644, 602 .proc_handler = proc_dointvec, 603 }, 604 #endif 605 #ifdef CONFIG_MODULES 606 { 607 .procname = "modprobe", 608 .data = &modprobe_path, 609 .maxlen = KMOD_PATH_LEN, 610 .mode = 0644, 611 .proc_handler = proc_dostring, 612 }, 613 { 614 .procname = "modules_disabled", 615 .data = &modules_disabled, 616 .maxlen = sizeof(int), 617 .mode = 0644, 618 /* only handle a transition from default "0" to "1" */ 619 .proc_handler = proc_dointvec_minmax, 620 .extra1 = &one, 621 .extra2 = &one, 622 }, 623 #endif 624 625 { 626 .procname = "hotplug", 627 .data = &uevent_helper, 628 .maxlen = UEVENT_HELPER_PATH_LEN, 629 .mode = 0644, 630 .proc_handler = proc_dostring, 631 }, 632 633 #ifdef CONFIG_CHR_DEV_SG 634 { 635 .procname = "sg-big-buff", 636 .data = &sg_big_buff, 637 .maxlen = sizeof (int), 638 .mode = 0444, 639 .proc_handler = proc_dointvec, 640 }, 641 #endif 642 #ifdef CONFIG_BSD_PROCESS_ACCT 643 { 644 .procname = "acct", 645 .data = &acct_parm, 646 .maxlen = 3*sizeof(int), 647 .mode = 0644, 648 .proc_handler = proc_dointvec, 649 }, 650 #endif 651 #ifdef CONFIG_MAGIC_SYSRQ 652 { 653 .procname = "sysrq", 654 .data = &__sysrq_enabled, 655 .maxlen = sizeof (int), 656 .mode = 0644, 657 .proc_handler = sysrq_sysctl_handler, 658 }, 659 #endif 660 #ifdef CONFIG_PROC_SYSCTL 661 { 662 .procname = "cad_pid", 663 .data = NULL, 664 .maxlen = sizeof (int), 665 .mode = 0600, 666 .proc_handler = proc_do_cad_pid, 667 }, 668 #endif 669 { 670 .procname = "threads-max", 671 .data = &max_threads, 672 .maxlen = sizeof(int), 673 .mode = 0644, 674 .proc_handler = proc_dointvec, 675 }, 676 { 677 .procname = "random", 678 .mode = 0555, 679 .child = random_table, 680 }, 681 { 682 .procname = "usermodehelper", 683 .mode = 0555, 684 .child = usermodehelper_table, 685 }, 686 { 687 .procname = "overflowuid", 688 .data = &overflowuid, 689 .maxlen = sizeof(int), 690 .mode = 0644, 691 .proc_handler = proc_dointvec_minmax, 692 .extra1 = &minolduid, 693 .extra2 = &maxolduid, 694 }, 695 { 696 .procname = "overflowgid", 697 .data = &overflowgid, 698 .maxlen = sizeof(int), 699 .mode = 0644, 700 .proc_handler = proc_dointvec_minmax, 701 .extra1 = &minolduid, 702 .extra2 = &maxolduid, 703 }, 704 #ifdef CONFIG_S390 705 #ifdef CONFIG_MATHEMU 706 { 707 .procname = "ieee_emulation_warnings", 708 .data = &sysctl_ieee_emulation_warnings, 709 .maxlen = sizeof(int), 710 .mode = 0644, 711 .proc_handler = proc_dointvec, 712 }, 713 #endif 714 { 715 .procname = "userprocess_debug", 716 .data = &show_unhandled_signals, 717 .maxlen = sizeof(int), 718 .mode = 0644, 719 .proc_handler = proc_dointvec, 720 }, 721 #endif 722 { 723 .procname = "pid_max", 724 .data = &pid_max, 725 .maxlen = sizeof (int), 726 .mode = 0644, 727 .proc_handler = proc_dointvec_minmax, 728 .extra1 = &pid_max_min, 729 .extra2 = &pid_max_max, 730 }, 731 { 732 .procname = "panic_on_oops", 733 .data = &panic_on_oops, 734 .maxlen = sizeof(int), 735 .mode = 0644, 736 .proc_handler = proc_dointvec, 737 }, 738 #if defined CONFIG_PRINTK 739 { 740 .procname = "printk", 741 .data = &console_loglevel, 742 .maxlen = 4*sizeof(int), 743 .mode = 0644, 744 .proc_handler = proc_dointvec, 745 }, 746 { 747 .procname = "printk_ratelimit", 748 .data = &printk_ratelimit_state.interval, 749 .maxlen = sizeof(int), 750 .mode = 0644, 751 .proc_handler = proc_dointvec_jiffies, 752 }, 753 { 754 .procname = "printk_ratelimit_burst", 755 .data = &printk_ratelimit_state.burst, 756 .maxlen = sizeof(int), 757 .mode = 0644, 758 .proc_handler = proc_dointvec, 759 }, 760 { 761 .procname = "printk_delay", 762 .data = &printk_delay_msec, 763 .maxlen = sizeof(int), 764 .mode = 0644, 765 .proc_handler = proc_dointvec_minmax, 766 .extra1 = &zero, 767 .extra2 = &ten_thousand, 768 }, 769 { 770 .procname = "dmesg_restrict", 771 .data = &dmesg_restrict, 772 .maxlen = sizeof(int), 773 .mode = 0644, 774 .proc_handler = proc_dointvec_minmax_sysadmin, 775 .extra1 = &zero, 776 .extra2 = &one, 777 }, 778 { 779 .procname = "kptr_restrict", 780 .data = &kptr_restrict, 781 .maxlen = sizeof(int), 782 .mode = 0644, 783 .proc_handler = proc_dointvec_minmax_sysadmin, 784 .extra1 = &zero, 785 .extra2 = &two, 786 }, 787 #endif 788 { 789 .procname = "ngroups_max", 790 .data = &ngroups_max, 791 .maxlen = sizeof (int), 792 .mode = 0444, 793 .proc_handler = proc_dointvec, 794 }, 795 { 796 .procname = "cap_last_cap", 797 .data = (void *)&cap_last_cap, 798 .maxlen = sizeof(int), 799 .mode = 0444, 800 .proc_handler = proc_dointvec, 801 }, 802 #if defined(CONFIG_LOCKUP_DETECTOR) 803 { 804 .procname = "watchdog", 805 .data = &watchdog_enabled, 806 .maxlen = sizeof (int), 807 .mode = 0644, 808 .proc_handler = proc_dowatchdog, 809 .extra1 = &zero, 810 .extra2 = &one, 811 }, 812 { 813 .procname = "watchdog_thresh", 814 .data = &watchdog_thresh, 815 .maxlen = sizeof(int), 816 .mode = 0644, 817 .proc_handler = proc_dowatchdog, 818 .extra1 = &neg_one, 819 .extra2 = &sixty, 820 }, 821 { 822 .procname = "softlockup_panic", 823 .data = &softlockup_panic, 824 .maxlen = sizeof(int), 825 .mode = 0644, 826 .proc_handler = proc_dointvec_minmax, 827 .extra1 = &zero, 828 .extra2 = &one, 829 }, 830 { 831 .procname = "nmi_watchdog", 832 .data = &watchdog_enabled, 833 .maxlen = sizeof (int), 834 .mode = 0644, 835 .proc_handler = proc_dowatchdog, 836 .extra1 = &zero, 837 .extra2 = &one, 838 }, 839 #endif 840 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 841 { 842 .procname = "unknown_nmi_panic", 843 .data = &unknown_nmi_panic, 844 .maxlen = sizeof (int), 845 .mode = 0644, 846 .proc_handler = proc_dointvec, 847 }, 848 #endif 849 #if defined(CONFIG_X86) 850 { 851 .procname = "panic_on_unrecovered_nmi", 852 .data = &panic_on_unrecovered_nmi, 853 .maxlen = sizeof(int), 854 .mode = 0644, 855 .proc_handler = proc_dointvec, 856 }, 857 { 858 .procname = "panic_on_io_nmi", 859 .data = &panic_on_io_nmi, 860 .maxlen = sizeof(int), 861 .mode = 0644, 862 .proc_handler = proc_dointvec, 863 }, 864 #ifdef CONFIG_DEBUG_STACKOVERFLOW 865 { 866 .procname = "panic_on_stackoverflow", 867 .data = &sysctl_panic_on_stackoverflow, 868 .maxlen = sizeof(int), 869 .mode = 0644, 870 .proc_handler = proc_dointvec, 871 }, 872 #endif 873 { 874 .procname = "bootloader_type", 875 .data = &bootloader_type, 876 .maxlen = sizeof (int), 877 .mode = 0444, 878 .proc_handler = proc_dointvec, 879 }, 880 { 881 .procname = "bootloader_version", 882 .data = &bootloader_version, 883 .maxlen = sizeof (int), 884 .mode = 0444, 885 .proc_handler = proc_dointvec, 886 }, 887 { 888 .procname = "kstack_depth_to_print", 889 .data = &kstack_depth_to_print, 890 .maxlen = sizeof(int), 891 .mode = 0644, 892 .proc_handler = proc_dointvec, 893 }, 894 { 895 .procname = "io_delay_type", 896 .data = &io_delay_type, 897 .maxlen = sizeof(int), 898 .mode = 0644, 899 .proc_handler = proc_dointvec, 900 }, 901 #endif 902 #if defined(CONFIG_MMU) 903 { 904 .procname = "randomize_va_space", 905 .data = &randomize_va_space, 906 .maxlen = sizeof(int), 907 .mode = 0644, 908 .proc_handler = proc_dointvec, 909 }, 910 #endif 911 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 912 { 913 .procname = "spin_retry", 914 .data = &spin_retry, 915 .maxlen = sizeof (int), 916 .mode = 0644, 917 .proc_handler = proc_dointvec, 918 }, 919 #endif 920 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 921 { 922 .procname = "acpi_video_flags", 923 .data = &acpi_realmode_flags, 924 .maxlen = sizeof (unsigned long), 925 .mode = 0644, 926 .proc_handler = proc_doulongvec_minmax, 927 }, 928 #endif 929 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 930 { 931 .procname = "ignore-unaligned-usertrap", 932 .data = &no_unaligned_warning, 933 .maxlen = sizeof (int), 934 .mode = 0644, 935 .proc_handler = proc_dointvec, 936 }, 937 #endif 938 #ifdef CONFIG_IA64 939 { 940 .procname = "unaligned-dump-stack", 941 .data = &unaligned_dump_stack, 942 .maxlen = sizeof (int), 943 .mode = 0644, 944 .proc_handler = proc_dointvec, 945 }, 946 #endif 947 #ifdef CONFIG_DETECT_HUNG_TASK 948 { 949 .procname = "hung_task_panic", 950 .data = &sysctl_hung_task_panic, 951 .maxlen = sizeof(int), 952 .mode = 0644, 953 .proc_handler = proc_dointvec_minmax, 954 .extra1 = &zero, 955 .extra2 = &one, 956 }, 957 { 958 .procname = "hung_task_check_count", 959 .data = &sysctl_hung_task_check_count, 960 .maxlen = sizeof(unsigned long), 961 .mode = 0644, 962 .proc_handler = proc_doulongvec_minmax, 963 }, 964 { 965 .procname = "hung_task_timeout_secs", 966 .data = &sysctl_hung_task_timeout_secs, 967 .maxlen = sizeof(unsigned long), 968 .mode = 0644, 969 .proc_handler = proc_dohung_task_timeout_secs, 970 }, 971 { 972 .procname = "hung_task_warnings", 973 .data = &sysctl_hung_task_warnings, 974 .maxlen = sizeof(unsigned long), 975 .mode = 0644, 976 .proc_handler = proc_doulongvec_minmax, 977 }, 978 #endif 979 #ifdef CONFIG_COMPAT 980 { 981 .procname = "compat-log", 982 .data = &compat_log, 983 .maxlen = sizeof (int), 984 .mode = 0644, 985 .proc_handler = proc_dointvec, 986 }, 987 #endif 988 #ifdef CONFIG_RT_MUTEXES 989 { 990 .procname = "max_lock_depth", 991 .data = &max_lock_depth, 992 .maxlen = sizeof(int), 993 .mode = 0644, 994 .proc_handler = proc_dointvec, 995 }, 996 #endif 997 { 998 .procname = "poweroff_cmd", 999 .data = &poweroff_cmd, 1000 .maxlen = POWEROFF_CMD_PATH_LEN, 1001 .mode = 0644, 1002 .proc_handler = proc_dostring, 1003 }, 1004 #ifdef CONFIG_KEYS 1005 { 1006 .procname = "keys", 1007 .mode = 0555, 1008 .child = key_sysctls, 1009 }, 1010 #endif 1011 #ifdef CONFIG_RCU_TORTURE_TEST 1012 { 1013 .procname = "rcutorture_runnable", 1014 .data = &rcutorture_runnable, 1015 .maxlen = sizeof(int), 1016 .mode = 0644, 1017 .proc_handler = proc_dointvec, 1018 }, 1019 #endif 1020 #ifdef CONFIG_PERF_EVENTS 1021 /* 1022 * User-space scripts rely on the existence of this file 1023 * as a feature check for perf_events being enabled. 1024 * 1025 * So it's an ABI, do not remove! 1026 */ 1027 { 1028 .procname = "perf_event_paranoid", 1029 .data = &sysctl_perf_event_paranoid, 1030 .maxlen = sizeof(sysctl_perf_event_paranoid), 1031 .mode = 0644, 1032 .proc_handler = proc_dointvec, 1033 }, 1034 { 1035 .procname = "perf_event_mlock_kb", 1036 .data = &sysctl_perf_event_mlock, 1037 .maxlen = sizeof(sysctl_perf_event_mlock), 1038 .mode = 0644, 1039 .proc_handler = proc_dointvec, 1040 }, 1041 { 1042 .procname = "perf_event_max_sample_rate", 1043 .data = &sysctl_perf_event_sample_rate, 1044 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1045 .mode = 0644, 1046 .proc_handler = perf_proc_update_handler, 1047 }, 1048 #endif 1049 #ifdef CONFIG_KMEMCHECK 1050 { 1051 .procname = "kmemcheck", 1052 .data = &kmemcheck_enabled, 1053 .maxlen = sizeof(int), 1054 .mode = 0644, 1055 .proc_handler = proc_dointvec, 1056 }, 1057 #endif 1058 #ifdef CONFIG_BLOCK 1059 { 1060 .procname = "blk_iopoll", 1061 .data = &blk_iopoll_enabled, 1062 .maxlen = sizeof(int), 1063 .mode = 0644, 1064 .proc_handler = proc_dointvec, 1065 }, 1066 #endif 1067 { } 1068 }; 1069 1070 static struct ctl_table vm_table[] = { 1071 { 1072 .procname = "overcommit_memory", 1073 .data = &sysctl_overcommit_memory, 1074 .maxlen = sizeof(sysctl_overcommit_memory), 1075 .mode = 0644, 1076 .proc_handler = proc_dointvec_minmax, 1077 .extra1 = &zero, 1078 .extra2 = &two, 1079 }, 1080 { 1081 .procname = "panic_on_oom", 1082 .data = &sysctl_panic_on_oom, 1083 .maxlen = sizeof(sysctl_panic_on_oom), 1084 .mode = 0644, 1085 .proc_handler = proc_dointvec_minmax, 1086 .extra1 = &zero, 1087 .extra2 = &two, 1088 }, 1089 { 1090 .procname = "oom_kill_allocating_task", 1091 .data = &sysctl_oom_kill_allocating_task, 1092 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1093 .mode = 0644, 1094 .proc_handler = proc_dointvec, 1095 }, 1096 { 1097 .procname = "oom_dump_tasks", 1098 .data = &sysctl_oom_dump_tasks, 1099 .maxlen = sizeof(sysctl_oom_dump_tasks), 1100 .mode = 0644, 1101 .proc_handler = proc_dointvec, 1102 }, 1103 { 1104 .procname = "overcommit_ratio", 1105 .data = &sysctl_overcommit_ratio, 1106 .maxlen = sizeof(sysctl_overcommit_ratio), 1107 .mode = 0644, 1108 .proc_handler = proc_dointvec, 1109 }, 1110 { 1111 .procname = "page-cluster", 1112 .data = &page_cluster, 1113 .maxlen = sizeof(int), 1114 .mode = 0644, 1115 .proc_handler = proc_dointvec_minmax, 1116 .extra1 = &zero, 1117 }, 1118 { 1119 .procname = "dirty_background_ratio", 1120 .data = &dirty_background_ratio, 1121 .maxlen = sizeof(dirty_background_ratio), 1122 .mode = 0644, 1123 .proc_handler = dirty_background_ratio_handler, 1124 .extra1 = &zero, 1125 .extra2 = &one_hundred, 1126 }, 1127 { 1128 .procname = "dirty_background_bytes", 1129 .data = &dirty_background_bytes, 1130 .maxlen = sizeof(dirty_background_bytes), 1131 .mode = 0644, 1132 .proc_handler = dirty_background_bytes_handler, 1133 .extra1 = &one_ul, 1134 }, 1135 { 1136 .procname = "dirty_ratio", 1137 .data = &vm_dirty_ratio, 1138 .maxlen = sizeof(vm_dirty_ratio), 1139 .mode = 0644, 1140 .proc_handler = dirty_ratio_handler, 1141 .extra1 = &zero, 1142 .extra2 = &one_hundred, 1143 }, 1144 { 1145 .procname = "dirty_bytes", 1146 .data = &vm_dirty_bytes, 1147 .maxlen = sizeof(vm_dirty_bytes), 1148 .mode = 0644, 1149 .proc_handler = dirty_bytes_handler, 1150 .extra1 = &dirty_bytes_min, 1151 }, 1152 { 1153 .procname = "dirty_writeback_centisecs", 1154 .data = &dirty_writeback_interval, 1155 .maxlen = sizeof(dirty_writeback_interval), 1156 .mode = 0644, 1157 .proc_handler = dirty_writeback_centisecs_handler, 1158 }, 1159 { 1160 .procname = "dirty_expire_centisecs", 1161 .data = &dirty_expire_interval, 1162 .maxlen = sizeof(dirty_expire_interval), 1163 .mode = 0644, 1164 .proc_handler = proc_dointvec_minmax, 1165 .extra1 = &zero, 1166 }, 1167 { 1168 .procname = "nr_pdflush_threads", 1169 .mode = 0444 /* read-only */, 1170 .proc_handler = pdflush_proc_obsolete, 1171 }, 1172 { 1173 .procname = "swappiness", 1174 .data = &vm_swappiness, 1175 .maxlen = sizeof(vm_swappiness), 1176 .mode = 0644, 1177 .proc_handler = proc_dointvec_minmax, 1178 .extra1 = &zero, 1179 .extra2 = &one_hundred, 1180 }, 1181 #ifdef CONFIG_HUGETLB_PAGE 1182 { 1183 .procname = "nr_hugepages", 1184 .data = NULL, 1185 .maxlen = sizeof(unsigned long), 1186 .mode = 0644, 1187 .proc_handler = hugetlb_sysctl_handler, 1188 .extra1 = (void *)&hugetlb_zero, 1189 .extra2 = (void *)&hugetlb_infinity, 1190 }, 1191 #ifdef CONFIG_NUMA 1192 { 1193 .procname = "nr_hugepages_mempolicy", 1194 .data = NULL, 1195 .maxlen = sizeof(unsigned long), 1196 .mode = 0644, 1197 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1198 .extra1 = (void *)&hugetlb_zero, 1199 .extra2 = (void *)&hugetlb_infinity, 1200 }, 1201 #endif 1202 { 1203 .procname = "hugetlb_shm_group", 1204 .data = &sysctl_hugetlb_shm_group, 1205 .maxlen = sizeof(gid_t), 1206 .mode = 0644, 1207 .proc_handler = proc_dointvec, 1208 }, 1209 { 1210 .procname = "hugepages_treat_as_movable", 1211 .data = &hugepages_treat_as_movable, 1212 .maxlen = sizeof(int), 1213 .mode = 0644, 1214 .proc_handler = hugetlb_treat_movable_handler, 1215 }, 1216 { 1217 .procname = "nr_overcommit_hugepages", 1218 .data = NULL, 1219 .maxlen = sizeof(unsigned long), 1220 .mode = 0644, 1221 .proc_handler = hugetlb_overcommit_handler, 1222 .extra1 = (void *)&hugetlb_zero, 1223 .extra2 = (void *)&hugetlb_infinity, 1224 }, 1225 #endif 1226 { 1227 .procname = "lowmem_reserve_ratio", 1228 .data = &sysctl_lowmem_reserve_ratio, 1229 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1230 .mode = 0644, 1231 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1232 }, 1233 { 1234 .procname = "drop_caches", 1235 .data = &sysctl_drop_caches, 1236 .maxlen = sizeof(int), 1237 .mode = 0644, 1238 .proc_handler = drop_caches_sysctl_handler, 1239 .extra1 = &one, 1240 .extra2 = &three, 1241 }, 1242 #ifdef CONFIG_COMPACTION 1243 { 1244 .procname = "compact_memory", 1245 .data = &sysctl_compact_memory, 1246 .maxlen = sizeof(int), 1247 .mode = 0200, 1248 .proc_handler = sysctl_compaction_handler, 1249 }, 1250 { 1251 .procname = "extfrag_threshold", 1252 .data = &sysctl_extfrag_threshold, 1253 .maxlen = sizeof(int), 1254 .mode = 0644, 1255 .proc_handler = sysctl_extfrag_handler, 1256 .extra1 = &min_extfrag_threshold, 1257 .extra2 = &max_extfrag_threshold, 1258 }, 1259 1260 #endif /* CONFIG_COMPACTION */ 1261 { 1262 .procname = "min_free_kbytes", 1263 .data = &min_free_kbytes, 1264 .maxlen = sizeof(min_free_kbytes), 1265 .mode = 0644, 1266 .proc_handler = min_free_kbytes_sysctl_handler, 1267 .extra1 = &zero, 1268 }, 1269 { 1270 .procname = "percpu_pagelist_fraction", 1271 .data = &percpu_pagelist_fraction, 1272 .maxlen = sizeof(percpu_pagelist_fraction), 1273 .mode = 0644, 1274 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1275 .extra1 = &min_percpu_pagelist_fract, 1276 }, 1277 #ifdef CONFIG_MMU 1278 { 1279 .procname = "max_map_count", 1280 .data = &sysctl_max_map_count, 1281 .maxlen = sizeof(sysctl_max_map_count), 1282 .mode = 0644, 1283 .proc_handler = proc_dointvec_minmax, 1284 .extra1 = &zero, 1285 }, 1286 #else 1287 { 1288 .procname = "nr_trim_pages", 1289 .data = &sysctl_nr_trim_pages, 1290 .maxlen = sizeof(sysctl_nr_trim_pages), 1291 .mode = 0644, 1292 .proc_handler = proc_dointvec_minmax, 1293 .extra1 = &zero, 1294 }, 1295 #endif 1296 { 1297 .procname = "laptop_mode", 1298 .data = &laptop_mode, 1299 .maxlen = sizeof(laptop_mode), 1300 .mode = 0644, 1301 .proc_handler = proc_dointvec_jiffies, 1302 }, 1303 { 1304 .procname = "block_dump", 1305 .data = &block_dump, 1306 .maxlen = sizeof(block_dump), 1307 .mode = 0644, 1308 .proc_handler = proc_dointvec, 1309 .extra1 = &zero, 1310 }, 1311 { 1312 .procname = "vfs_cache_pressure", 1313 .data = &sysctl_vfs_cache_pressure, 1314 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1315 .mode = 0644, 1316 .proc_handler = proc_dointvec, 1317 .extra1 = &zero, 1318 }, 1319 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1320 { 1321 .procname = "legacy_va_layout", 1322 .data = &sysctl_legacy_va_layout, 1323 .maxlen = sizeof(sysctl_legacy_va_layout), 1324 .mode = 0644, 1325 .proc_handler = proc_dointvec, 1326 .extra1 = &zero, 1327 }, 1328 #endif 1329 #ifdef CONFIG_NUMA 1330 { 1331 .procname = "zone_reclaim_mode", 1332 .data = &zone_reclaim_mode, 1333 .maxlen = sizeof(zone_reclaim_mode), 1334 .mode = 0644, 1335 .proc_handler = proc_dointvec, 1336 .extra1 = &zero, 1337 }, 1338 { 1339 .procname = "min_unmapped_ratio", 1340 .data = &sysctl_min_unmapped_ratio, 1341 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1342 .mode = 0644, 1343 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1344 .extra1 = &zero, 1345 .extra2 = &one_hundred, 1346 }, 1347 { 1348 .procname = "min_slab_ratio", 1349 .data = &sysctl_min_slab_ratio, 1350 .maxlen = sizeof(sysctl_min_slab_ratio), 1351 .mode = 0644, 1352 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1353 .extra1 = &zero, 1354 .extra2 = &one_hundred, 1355 }, 1356 #endif 1357 #ifdef CONFIG_SMP 1358 { 1359 .procname = "stat_interval", 1360 .data = &sysctl_stat_interval, 1361 .maxlen = sizeof(sysctl_stat_interval), 1362 .mode = 0644, 1363 .proc_handler = proc_dointvec_jiffies, 1364 }, 1365 #endif 1366 #ifdef CONFIG_MMU 1367 { 1368 .procname = "mmap_min_addr", 1369 .data = &dac_mmap_min_addr, 1370 .maxlen = sizeof(unsigned long), 1371 .mode = 0644, 1372 .proc_handler = mmap_min_addr_handler, 1373 }, 1374 #endif 1375 #ifdef CONFIG_NUMA 1376 { 1377 .procname = "numa_zonelist_order", 1378 .data = &numa_zonelist_order, 1379 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1380 .mode = 0644, 1381 .proc_handler = numa_zonelist_order_handler, 1382 }, 1383 #endif 1384 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1385 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1386 { 1387 .procname = "vdso_enabled", 1388 .data = &vdso_enabled, 1389 .maxlen = sizeof(vdso_enabled), 1390 .mode = 0644, 1391 .proc_handler = proc_dointvec, 1392 .extra1 = &zero, 1393 }, 1394 #endif 1395 #ifdef CONFIG_HIGHMEM 1396 { 1397 .procname = "highmem_is_dirtyable", 1398 .data = &vm_highmem_is_dirtyable, 1399 .maxlen = sizeof(vm_highmem_is_dirtyable), 1400 .mode = 0644, 1401 .proc_handler = proc_dointvec_minmax, 1402 .extra1 = &zero, 1403 .extra2 = &one, 1404 }, 1405 #endif 1406 { 1407 .procname = "scan_unevictable_pages", 1408 .data = &scan_unevictable_pages, 1409 .maxlen = sizeof(scan_unevictable_pages), 1410 .mode = 0644, 1411 .proc_handler = scan_unevictable_handler, 1412 }, 1413 #ifdef CONFIG_MEMORY_FAILURE 1414 { 1415 .procname = "memory_failure_early_kill", 1416 .data = &sysctl_memory_failure_early_kill, 1417 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1418 .mode = 0644, 1419 .proc_handler = proc_dointvec_minmax, 1420 .extra1 = &zero, 1421 .extra2 = &one, 1422 }, 1423 { 1424 .procname = "memory_failure_recovery", 1425 .data = &sysctl_memory_failure_recovery, 1426 .maxlen = sizeof(sysctl_memory_failure_recovery), 1427 .mode = 0644, 1428 .proc_handler = proc_dointvec_minmax, 1429 .extra1 = &zero, 1430 .extra2 = &one, 1431 }, 1432 #endif 1433 { } 1434 }; 1435 1436 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1437 static struct ctl_table binfmt_misc_table[] = { 1438 { } 1439 }; 1440 #endif 1441 1442 static struct ctl_table fs_table[] = { 1443 { 1444 .procname = "inode-nr", 1445 .data = &inodes_stat, 1446 .maxlen = 2*sizeof(int), 1447 .mode = 0444, 1448 .proc_handler = proc_nr_inodes, 1449 }, 1450 { 1451 .procname = "inode-state", 1452 .data = &inodes_stat, 1453 .maxlen = 7*sizeof(int), 1454 .mode = 0444, 1455 .proc_handler = proc_nr_inodes, 1456 }, 1457 { 1458 .procname = "file-nr", 1459 .data = &files_stat, 1460 .maxlen = sizeof(files_stat), 1461 .mode = 0444, 1462 .proc_handler = proc_nr_files, 1463 }, 1464 { 1465 .procname = "file-max", 1466 .data = &files_stat.max_files, 1467 .maxlen = sizeof(files_stat.max_files), 1468 .mode = 0644, 1469 .proc_handler = proc_doulongvec_minmax, 1470 }, 1471 { 1472 .procname = "nr_open", 1473 .data = &sysctl_nr_open, 1474 .maxlen = sizeof(int), 1475 .mode = 0644, 1476 .proc_handler = proc_dointvec_minmax, 1477 .extra1 = &sysctl_nr_open_min, 1478 .extra2 = &sysctl_nr_open_max, 1479 }, 1480 { 1481 .procname = "dentry-state", 1482 .data = &dentry_stat, 1483 .maxlen = 6*sizeof(int), 1484 .mode = 0444, 1485 .proc_handler = proc_nr_dentry, 1486 }, 1487 { 1488 .procname = "overflowuid", 1489 .data = &fs_overflowuid, 1490 .maxlen = sizeof(int), 1491 .mode = 0644, 1492 .proc_handler = proc_dointvec_minmax, 1493 .extra1 = &minolduid, 1494 .extra2 = &maxolduid, 1495 }, 1496 { 1497 .procname = "overflowgid", 1498 .data = &fs_overflowgid, 1499 .maxlen = sizeof(int), 1500 .mode = 0644, 1501 .proc_handler = proc_dointvec_minmax, 1502 .extra1 = &minolduid, 1503 .extra2 = &maxolduid, 1504 }, 1505 #ifdef CONFIG_FILE_LOCKING 1506 { 1507 .procname = "leases-enable", 1508 .data = &leases_enable, 1509 .maxlen = sizeof(int), 1510 .mode = 0644, 1511 .proc_handler = proc_dointvec, 1512 }, 1513 #endif 1514 #ifdef CONFIG_DNOTIFY 1515 { 1516 .procname = "dir-notify-enable", 1517 .data = &dir_notify_enable, 1518 .maxlen = sizeof(int), 1519 .mode = 0644, 1520 .proc_handler = proc_dointvec, 1521 }, 1522 #endif 1523 #ifdef CONFIG_MMU 1524 #ifdef CONFIG_FILE_LOCKING 1525 { 1526 .procname = "lease-break-time", 1527 .data = &lease_break_time, 1528 .maxlen = sizeof(int), 1529 .mode = 0644, 1530 .proc_handler = proc_dointvec, 1531 }, 1532 #endif 1533 #ifdef CONFIG_AIO 1534 { 1535 .procname = "aio-nr", 1536 .data = &aio_nr, 1537 .maxlen = sizeof(aio_nr), 1538 .mode = 0444, 1539 .proc_handler = proc_doulongvec_minmax, 1540 }, 1541 { 1542 .procname = "aio-max-nr", 1543 .data = &aio_max_nr, 1544 .maxlen = sizeof(aio_max_nr), 1545 .mode = 0644, 1546 .proc_handler = proc_doulongvec_minmax, 1547 }, 1548 #endif /* CONFIG_AIO */ 1549 #ifdef CONFIG_INOTIFY_USER 1550 { 1551 .procname = "inotify", 1552 .mode = 0555, 1553 .child = inotify_table, 1554 }, 1555 #endif 1556 #ifdef CONFIG_EPOLL 1557 { 1558 .procname = "epoll", 1559 .mode = 0555, 1560 .child = epoll_table, 1561 }, 1562 #endif 1563 #endif 1564 { 1565 .procname = "protected_symlinks", 1566 .data = &sysctl_protected_symlinks, 1567 .maxlen = sizeof(int), 1568 .mode = 0600, 1569 .proc_handler = proc_dointvec_minmax, 1570 .extra1 = &zero, 1571 .extra2 = &one, 1572 }, 1573 { 1574 .procname = "protected_hardlinks", 1575 .data = &sysctl_protected_hardlinks, 1576 .maxlen = sizeof(int), 1577 .mode = 0600, 1578 .proc_handler = proc_dointvec_minmax, 1579 .extra1 = &zero, 1580 .extra2 = &one, 1581 }, 1582 { 1583 .procname = "suid_dumpable", 1584 .data = &suid_dumpable, 1585 .maxlen = sizeof(int), 1586 .mode = 0644, 1587 .proc_handler = proc_dointvec_minmax_coredump, 1588 .extra1 = &zero, 1589 .extra2 = &two, 1590 }, 1591 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1592 { 1593 .procname = "binfmt_misc", 1594 .mode = 0555, 1595 .child = binfmt_misc_table, 1596 }, 1597 #endif 1598 { 1599 .procname = "pipe-max-size", 1600 .data = &pipe_max_size, 1601 .maxlen = sizeof(int), 1602 .mode = 0644, 1603 .proc_handler = &pipe_proc_fn, 1604 .extra1 = &pipe_min_size, 1605 }, 1606 { } 1607 }; 1608 1609 static struct ctl_table debug_table[] = { 1610 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1611 { 1612 .procname = "exception-trace", 1613 .data = &show_unhandled_signals, 1614 .maxlen = sizeof(int), 1615 .mode = 0644, 1616 .proc_handler = proc_dointvec 1617 }, 1618 #endif 1619 #if defined(CONFIG_OPTPROBES) 1620 { 1621 .procname = "kprobes-optimization", 1622 .data = &sysctl_kprobes_optimization, 1623 .maxlen = sizeof(int), 1624 .mode = 0644, 1625 .proc_handler = proc_kprobes_optimization_handler, 1626 .extra1 = &zero, 1627 .extra2 = &one, 1628 }, 1629 #endif 1630 { } 1631 }; 1632 1633 static struct ctl_table dev_table[] = { 1634 { } 1635 }; 1636 1637 int __init sysctl_init(void) 1638 { 1639 struct ctl_table_header *hdr; 1640 1641 hdr = register_sysctl_table(sysctl_base_table); 1642 kmemleak_not_leak(hdr); 1643 return 0; 1644 } 1645 1646 #endif /* CONFIG_SYSCTL */ 1647 1648 /* 1649 * /proc/sys support 1650 */ 1651 1652 #ifdef CONFIG_PROC_SYSCTL 1653 1654 static int _proc_do_string(void* data, int maxlen, int write, 1655 void __user *buffer, 1656 size_t *lenp, loff_t *ppos) 1657 { 1658 size_t len; 1659 char __user *p; 1660 char c; 1661 1662 if (!data || !maxlen || !*lenp) { 1663 *lenp = 0; 1664 return 0; 1665 } 1666 1667 if (write) { 1668 len = 0; 1669 p = buffer; 1670 while (len < *lenp) { 1671 if (get_user(c, p++)) 1672 return -EFAULT; 1673 if (c == 0 || c == '\n') 1674 break; 1675 len++; 1676 } 1677 if (len >= maxlen) 1678 len = maxlen-1; 1679 if(copy_from_user(data, buffer, len)) 1680 return -EFAULT; 1681 ((char *) data)[len] = 0; 1682 *ppos += *lenp; 1683 } else { 1684 len = strlen(data); 1685 if (len > maxlen) 1686 len = maxlen; 1687 1688 if (*ppos > len) { 1689 *lenp = 0; 1690 return 0; 1691 } 1692 1693 data += *ppos; 1694 len -= *ppos; 1695 1696 if (len > *lenp) 1697 len = *lenp; 1698 if (len) 1699 if(copy_to_user(buffer, data, len)) 1700 return -EFAULT; 1701 if (len < *lenp) { 1702 if(put_user('\n', ((char __user *) buffer) + len)) 1703 return -EFAULT; 1704 len++; 1705 } 1706 *lenp = len; 1707 *ppos += len; 1708 } 1709 return 0; 1710 } 1711 1712 /** 1713 * proc_dostring - read a string sysctl 1714 * @table: the sysctl table 1715 * @write: %TRUE if this is a write to the sysctl file 1716 * @buffer: the user buffer 1717 * @lenp: the size of the user buffer 1718 * @ppos: file position 1719 * 1720 * Reads/writes a string from/to the user buffer. If the kernel 1721 * buffer provided is not large enough to hold the string, the 1722 * string is truncated. The copied string is %NULL-terminated. 1723 * If the string is being read by the user process, it is copied 1724 * and a newline '\n' is added. It is truncated if the buffer is 1725 * not large enough. 1726 * 1727 * Returns 0 on success. 1728 */ 1729 int proc_dostring(struct ctl_table *table, int write, 1730 void __user *buffer, size_t *lenp, loff_t *ppos) 1731 { 1732 return _proc_do_string(table->data, table->maxlen, write, 1733 buffer, lenp, ppos); 1734 } 1735 1736 static size_t proc_skip_spaces(char **buf) 1737 { 1738 size_t ret; 1739 char *tmp = skip_spaces(*buf); 1740 ret = tmp - *buf; 1741 *buf = tmp; 1742 return ret; 1743 } 1744 1745 static void proc_skip_char(char **buf, size_t *size, const char v) 1746 { 1747 while (*size) { 1748 if (**buf != v) 1749 break; 1750 (*size)--; 1751 (*buf)++; 1752 } 1753 } 1754 1755 #define TMPBUFLEN 22 1756 /** 1757 * proc_get_long - reads an ASCII formatted integer from a user buffer 1758 * 1759 * @buf: a kernel buffer 1760 * @size: size of the kernel buffer 1761 * @val: this is where the number will be stored 1762 * @neg: set to %TRUE if number is negative 1763 * @perm_tr: a vector which contains the allowed trailers 1764 * @perm_tr_len: size of the perm_tr vector 1765 * @tr: pointer to store the trailer character 1766 * 1767 * In case of success %0 is returned and @buf and @size are updated with 1768 * the amount of bytes read. If @tr is non-NULL and a trailing 1769 * character exists (size is non-zero after returning from this 1770 * function), @tr is updated with the trailing character. 1771 */ 1772 static int proc_get_long(char **buf, size_t *size, 1773 unsigned long *val, bool *neg, 1774 const char *perm_tr, unsigned perm_tr_len, char *tr) 1775 { 1776 int len; 1777 char *p, tmp[TMPBUFLEN]; 1778 1779 if (!*size) 1780 return -EINVAL; 1781 1782 len = *size; 1783 if (len > TMPBUFLEN - 1) 1784 len = TMPBUFLEN - 1; 1785 1786 memcpy(tmp, *buf, len); 1787 1788 tmp[len] = 0; 1789 p = tmp; 1790 if (*p == '-' && *size > 1) { 1791 *neg = true; 1792 p++; 1793 } else 1794 *neg = false; 1795 if (!isdigit(*p)) 1796 return -EINVAL; 1797 1798 *val = simple_strtoul(p, &p, 0); 1799 1800 len = p - tmp; 1801 1802 /* We don't know if the next char is whitespace thus we may accept 1803 * invalid integers (e.g. 1234...a) or two integers instead of one 1804 * (e.g. 123...1). So lets not allow such large numbers. */ 1805 if (len == TMPBUFLEN - 1) 1806 return -EINVAL; 1807 1808 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1809 return -EINVAL; 1810 1811 if (tr && (len < *size)) 1812 *tr = *p; 1813 1814 *buf += len; 1815 *size -= len; 1816 1817 return 0; 1818 } 1819 1820 /** 1821 * proc_put_long - converts an integer to a decimal ASCII formatted string 1822 * 1823 * @buf: the user buffer 1824 * @size: the size of the user buffer 1825 * @val: the integer to be converted 1826 * @neg: sign of the number, %TRUE for negative 1827 * 1828 * In case of success %0 is returned and @buf and @size are updated with 1829 * the amount of bytes written. 1830 */ 1831 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1832 bool neg) 1833 { 1834 int len; 1835 char tmp[TMPBUFLEN], *p = tmp; 1836 1837 sprintf(p, "%s%lu", neg ? "-" : "", val); 1838 len = strlen(tmp); 1839 if (len > *size) 1840 len = *size; 1841 if (copy_to_user(*buf, tmp, len)) 1842 return -EFAULT; 1843 *size -= len; 1844 *buf += len; 1845 return 0; 1846 } 1847 #undef TMPBUFLEN 1848 1849 static int proc_put_char(void __user **buf, size_t *size, char c) 1850 { 1851 if (*size) { 1852 char __user **buffer = (char __user **)buf; 1853 if (put_user(c, *buffer)) 1854 return -EFAULT; 1855 (*size)--, (*buffer)++; 1856 *buf = *buffer; 1857 } 1858 return 0; 1859 } 1860 1861 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1862 int *valp, 1863 int write, void *data) 1864 { 1865 if (write) { 1866 *valp = *negp ? -*lvalp : *lvalp; 1867 } else { 1868 int val = *valp; 1869 if (val < 0) { 1870 *negp = true; 1871 *lvalp = (unsigned long)-val; 1872 } else { 1873 *negp = false; 1874 *lvalp = (unsigned long)val; 1875 } 1876 } 1877 return 0; 1878 } 1879 1880 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1881 1882 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1883 int write, void __user *buffer, 1884 size_t *lenp, loff_t *ppos, 1885 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1886 int write, void *data), 1887 void *data) 1888 { 1889 int *i, vleft, first = 1, err = 0; 1890 unsigned long page = 0; 1891 size_t left; 1892 char *kbuf; 1893 1894 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1895 *lenp = 0; 1896 return 0; 1897 } 1898 1899 i = (int *) tbl_data; 1900 vleft = table->maxlen / sizeof(*i); 1901 left = *lenp; 1902 1903 if (!conv) 1904 conv = do_proc_dointvec_conv; 1905 1906 if (write) { 1907 if (left > PAGE_SIZE - 1) 1908 left = PAGE_SIZE - 1; 1909 page = __get_free_page(GFP_TEMPORARY); 1910 kbuf = (char *) page; 1911 if (!kbuf) 1912 return -ENOMEM; 1913 if (copy_from_user(kbuf, buffer, left)) { 1914 err = -EFAULT; 1915 goto free; 1916 } 1917 kbuf[left] = 0; 1918 } 1919 1920 for (; left && vleft--; i++, first=0) { 1921 unsigned long lval; 1922 bool neg; 1923 1924 if (write) { 1925 left -= proc_skip_spaces(&kbuf); 1926 1927 if (!left) 1928 break; 1929 err = proc_get_long(&kbuf, &left, &lval, &neg, 1930 proc_wspace_sep, 1931 sizeof(proc_wspace_sep), NULL); 1932 if (err) 1933 break; 1934 if (conv(&neg, &lval, i, 1, data)) { 1935 err = -EINVAL; 1936 break; 1937 } 1938 } else { 1939 if (conv(&neg, &lval, i, 0, data)) { 1940 err = -EINVAL; 1941 break; 1942 } 1943 if (!first) 1944 err = proc_put_char(&buffer, &left, '\t'); 1945 if (err) 1946 break; 1947 err = proc_put_long(&buffer, &left, lval, neg); 1948 if (err) 1949 break; 1950 } 1951 } 1952 1953 if (!write && !first && left && !err) 1954 err = proc_put_char(&buffer, &left, '\n'); 1955 if (write && !err && left) 1956 left -= proc_skip_spaces(&kbuf); 1957 free: 1958 if (write) { 1959 free_page(page); 1960 if (first) 1961 return err ? : -EINVAL; 1962 } 1963 *lenp -= left; 1964 *ppos += *lenp; 1965 return err; 1966 } 1967 1968 static int do_proc_dointvec(struct ctl_table *table, int write, 1969 void __user *buffer, size_t *lenp, loff_t *ppos, 1970 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1971 int write, void *data), 1972 void *data) 1973 { 1974 return __do_proc_dointvec(table->data, table, write, 1975 buffer, lenp, ppos, conv, data); 1976 } 1977 1978 /** 1979 * proc_dointvec - read a vector of integers 1980 * @table: the sysctl table 1981 * @write: %TRUE if this is a write to the sysctl file 1982 * @buffer: the user buffer 1983 * @lenp: the size of the user buffer 1984 * @ppos: file position 1985 * 1986 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1987 * values from/to the user buffer, treated as an ASCII string. 1988 * 1989 * Returns 0 on success. 1990 */ 1991 int proc_dointvec(struct ctl_table *table, int write, 1992 void __user *buffer, size_t *lenp, loff_t *ppos) 1993 { 1994 return do_proc_dointvec(table,write,buffer,lenp,ppos, 1995 NULL,NULL); 1996 } 1997 1998 /* 1999 * Taint values can only be increased 2000 * This means we can safely use a temporary. 2001 */ 2002 static int proc_taint(struct ctl_table *table, int write, 2003 void __user *buffer, size_t *lenp, loff_t *ppos) 2004 { 2005 struct ctl_table t; 2006 unsigned long tmptaint = get_taint(); 2007 int err; 2008 2009 if (write && !capable(CAP_SYS_ADMIN)) 2010 return -EPERM; 2011 2012 t = *table; 2013 t.data = &tmptaint; 2014 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2015 if (err < 0) 2016 return err; 2017 2018 if (write) { 2019 /* 2020 * Poor man's atomic or. Not worth adding a primitive 2021 * to everyone's atomic.h for this 2022 */ 2023 int i; 2024 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2025 if ((tmptaint >> i) & 1) 2026 add_taint(i, LOCKDEP_STILL_OK); 2027 } 2028 } 2029 2030 return err; 2031 } 2032 2033 #ifdef CONFIG_PRINTK 2034 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2035 void __user *buffer, size_t *lenp, loff_t *ppos) 2036 { 2037 if (write && !capable(CAP_SYS_ADMIN)) 2038 return -EPERM; 2039 2040 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2041 } 2042 #endif 2043 2044 struct do_proc_dointvec_minmax_conv_param { 2045 int *min; 2046 int *max; 2047 }; 2048 2049 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2050 int *valp, 2051 int write, void *data) 2052 { 2053 struct do_proc_dointvec_minmax_conv_param *param = data; 2054 if (write) { 2055 int val = *negp ? -*lvalp : *lvalp; 2056 if ((param->min && *param->min > val) || 2057 (param->max && *param->max < val)) 2058 return -EINVAL; 2059 *valp = val; 2060 } else { 2061 int val = *valp; 2062 if (val < 0) { 2063 *negp = true; 2064 *lvalp = (unsigned long)-val; 2065 } else { 2066 *negp = false; 2067 *lvalp = (unsigned long)val; 2068 } 2069 } 2070 return 0; 2071 } 2072 2073 /** 2074 * proc_dointvec_minmax - read a vector of integers with min/max values 2075 * @table: the sysctl table 2076 * @write: %TRUE if this is a write to the sysctl file 2077 * @buffer: the user buffer 2078 * @lenp: the size of the user buffer 2079 * @ppos: file position 2080 * 2081 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2082 * values from/to the user buffer, treated as an ASCII string. 2083 * 2084 * This routine will ensure the values are within the range specified by 2085 * table->extra1 (min) and table->extra2 (max). 2086 * 2087 * Returns 0 on success. 2088 */ 2089 int proc_dointvec_minmax(struct ctl_table *table, int write, 2090 void __user *buffer, size_t *lenp, loff_t *ppos) 2091 { 2092 struct do_proc_dointvec_minmax_conv_param param = { 2093 .min = (int *) table->extra1, 2094 .max = (int *) table->extra2, 2095 }; 2096 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2097 do_proc_dointvec_minmax_conv, ¶m); 2098 } 2099 2100 static void validate_coredump_safety(void) 2101 { 2102 #ifdef CONFIG_COREDUMP 2103 if (suid_dumpable == SUID_DUMP_ROOT && 2104 core_pattern[0] != '/' && core_pattern[0] != '|') { 2105 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2106 "suid_dumpable=2. Pipe handler or fully qualified "\ 2107 "core dump path required.\n"); 2108 } 2109 #endif 2110 } 2111 2112 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2113 void __user *buffer, size_t *lenp, loff_t *ppos) 2114 { 2115 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2116 if (!error) 2117 validate_coredump_safety(); 2118 return error; 2119 } 2120 2121 #ifdef CONFIG_COREDUMP 2122 static int proc_dostring_coredump(struct ctl_table *table, int write, 2123 void __user *buffer, size_t *lenp, loff_t *ppos) 2124 { 2125 int error = proc_dostring(table, write, buffer, lenp, ppos); 2126 if (!error) 2127 validate_coredump_safety(); 2128 return error; 2129 } 2130 #endif 2131 2132 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2133 void __user *buffer, 2134 size_t *lenp, loff_t *ppos, 2135 unsigned long convmul, 2136 unsigned long convdiv) 2137 { 2138 unsigned long *i, *min, *max; 2139 int vleft, first = 1, err = 0; 2140 unsigned long page = 0; 2141 size_t left; 2142 char *kbuf; 2143 2144 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2145 *lenp = 0; 2146 return 0; 2147 } 2148 2149 i = (unsigned long *) data; 2150 min = (unsigned long *) table->extra1; 2151 max = (unsigned long *) table->extra2; 2152 vleft = table->maxlen / sizeof(unsigned long); 2153 left = *lenp; 2154 2155 if (write) { 2156 if (left > PAGE_SIZE - 1) 2157 left = PAGE_SIZE - 1; 2158 page = __get_free_page(GFP_TEMPORARY); 2159 kbuf = (char *) page; 2160 if (!kbuf) 2161 return -ENOMEM; 2162 if (copy_from_user(kbuf, buffer, left)) { 2163 err = -EFAULT; 2164 goto free; 2165 } 2166 kbuf[left] = 0; 2167 } 2168 2169 for (; left && vleft--; i++, first = 0) { 2170 unsigned long val; 2171 2172 if (write) { 2173 bool neg; 2174 2175 left -= proc_skip_spaces(&kbuf); 2176 2177 err = proc_get_long(&kbuf, &left, &val, &neg, 2178 proc_wspace_sep, 2179 sizeof(proc_wspace_sep), NULL); 2180 if (err) 2181 break; 2182 if (neg) 2183 continue; 2184 if ((min && val < *min) || (max && val > *max)) 2185 continue; 2186 *i = val; 2187 } else { 2188 val = convdiv * (*i) / convmul; 2189 if (!first) 2190 err = proc_put_char(&buffer, &left, '\t'); 2191 err = proc_put_long(&buffer, &left, val, false); 2192 if (err) 2193 break; 2194 } 2195 } 2196 2197 if (!write && !first && left && !err) 2198 err = proc_put_char(&buffer, &left, '\n'); 2199 if (write && !err) 2200 left -= proc_skip_spaces(&kbuf); 2201 free: 2202 if (write) { 2203 free_page(page); 2204 if (first) 2205 return err ? : -EINVAL; 2206 } 2207 *lenp -= left; 2208 *ppos += *lenp; 2209 return err; 2210 } 2211 2212 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2213 void __user *buffer, 2214 size_t *lenp, loff_t *ppos, 2215 unsigned long convmul, 2216 unsigned long convdiv) 2217 { 2218 return __do_proc_doulongvec_minmax(table->data, table, write, 2219 buffer, lenp, ppos, convmul, convdiv); 2220 } 2221 2222 /** 2223 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2224 * @table: the sysctl table 2225 * @write: %TRUE if this is a write to the sysctl file 2226 * @buffer: the user buffer 2227 * @lenp: the size of the user buffer 2228 * @ppos: file position 2229 * 2230 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2231 * values from/to the user buffer, treated as an ASCII string. 2232 * 2233 * This routine will ensure the values are within the range specified by 2234 * table->extra1 (min) and table->extra2 (max). 2235 * 2236 * Returns 0 on success. 2237 */ 2238 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2239 void __user *buffer, size_t *lenp, loff_t *ppos) 2240 { 2241 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2242 } 2243 2244 /** 2245 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2246 * @table: the sysctl table 2247 * @write: %TRUE if this is a write to the sysctl file 2248 * @buffer: the user buffer 2249 * @lenp: the size of the user buffer 2250 * @ppos: file position 2251 * 2252 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2253 * values from/to the user buffer, treated as an ASCII string. The values 2254 * are treated as milliseconds, and converted to jiffies when they are stored. 2255 * 2256 * This routine will ensure the values are within the range specified by 2257 * table->extra1 (min) and table->extra2 (max). 2258 * 2259 * Returns 0 on success. 2260 */ 2261 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2262 void __user *buffer, 2263 size_t *lenp, loff_t *ppos) 2264 { 2265 return do_proc_doulongvec_minmax(table, write, buffer, 2266 lenp, ppos, HZ, 1000l); 2267 } 2268 2269 2270 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2271 int *valp, 2272 int write, void *data) 2273 { 2274 if (write) { 2275 if (*lvalp > LONG_MAX / HZ) 2276 return 1; 2277 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2278 } else { 2279 int val = *valp; 2280 unsigned long lval; 2281 if (val < 0) { 2282 *negp = true; 2283 lval = (unsigned long)-val; 2284 } else { 2285 *negp = false; 2286 lval = (unsigned long)val; 2287 } 2288 *lvalp = lval / HZ; 2289 } 2290 return 0; 2291 } 2292 2293 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2294 int *valp, 2295 int write, void *data) 2296 { 2297 if (write) { 2298 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2299 return 1; 2300 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2301 } else { 2302 int val = *valp; 2303 unsigned long lval; 2304 if (val < 0) { 2305 *negp = true; 2306 lval = (unsigned long)-val; 2307 } else { 2308 *negp = false; 2309 lval = (unsigned long)val; 2310 } 2311 *lvalp = jiffies_to_clock_t(lval); 2312 } 2313 return 0; 2314 } 2315 2316 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2317 int *valp, 2318 int write, void *data) 2319 { 2320 if (write) { 2321 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2322 } else { 2323 int val = *valp; 2324 unsigned long lval; 2325 if (val < 0) { 2326 *negp = true; 2327 lval = (unsigned long)-val; 2328 } else { 2329 *negp = false; 2330 lval = (unsigned long)val; 2331 } 2332 *lvalp = jiffies_to_msecs(lval); 2333 } 2334 return 0; 2335 } 2336 2337 /** 2338 * proc_dointvec_jiffies - read a vector of integers as seconds 2339 * @table: the sysctl table 2340 * @write: %TRUE if this is a write to the sysctl file 2341 * @buffer: the user buffer 2342 * @lenp: the size of the user buffer 2343 * @ppos: file position 2344 * 2345 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2346 * values from/to the user buffer, treated as an ASCII string. 2347 * The values read are assumed to be in seconds, and are converted into 2348 * jiffies. 2349 * 2350 * Returns 0 on success. 2351 */ 2352 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2353 void __user *buffer, size_t *lenp, loff_t *ppos) 2354 { 2355 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2356 do_proc_dointvec_jiffies_conv,NULL); 2357 } 2358 2359 /** 2360 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 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: pointer to the file position 2366 * 2367 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2368 * values from/to the user buffer, treated as an ASCII string. 2369 * The values read are assumed to be in 1/USER_HZ seconds, and 2370 * are converted into jiffies. 2371 * 2372 * Returns 0 on success. 2373 */ 2374 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2375 void __user *buffer, size_t *lenp, loff_t *ppos) 2376 { 2377 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2378 do_proc_dointvec_userhz_jiffies_conv,NULL); 2379 } 2380 2381 /** 2382 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2383 * @table: the sysctl table 2384 * @write: %TRUE if this is a write to the sysctl file 2385 * @buffer: the user buffer 2386 * @lenp: the size of the user buffer 2387 * @ppos: file position 2388 * @ppos: the current position in the file 2389 * 2390 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2391 * values from/to the user buffer, treated as an ASCII string. 2392 * The values read are assumed to be in 1/1000 seconds, and 2393 * are converted into jiffies. 2394 * 2395 * Returns 0 on success. 2396 */ 2397 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2398 void __user *buffer, size_t *lenp, loff_t *ppos) 2399 { 2400 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2401 do_proc_dointvec_ms_jiffies_conv, NULL); 2402 } 2403 2404 static int proc_do_cad_pid(struct ctl_table *table, int write, 2405 void __user *buffer, size_t *lenp, loff_t *ppos) 2406 { 2407 struct pid *new_pid; 2408 pid_t tmp; 2409 int r; 2410 2411 tmp = pid_vnr(cad_pid); 2412 2413 r = __do_proc_dointvec(&tmp, table, write, buffer, 2414 lenp, ppos, NULL, NULL); 2415 if (r || !write) 2416 return r; 2417 2418 new_pid = find_get_pid(tmp); 2419 if (!new_pid) 2420 return -ESRCH; 2421 2422 put_pid(xchg(&cad_pid, new_pid)); 2423 return 0; 2424 } 2425 2426 /** 2427 * proc_do_large_bitmap - read/write from/to a large bitmap 2428 * @table: the sysctl table 2429 * @write: %TRUE if this is a write to the sysctl file 2430 * @buffer: the user buffer 2431 * @lenp: the size of the user buffer 2432 * @ppos: file position 2433 * 2434 * The bitmap is stored at table->data and the bitmap length (in bits) 2435 * in table->maxlen. 2436 * 2437 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2438 * large bitmaps may be represented in a compact manner. Writing into 2439 * the file will clear the bitmap then update it with the given input. 2440 * 2441 * Returns 0 on success. 2442 */ 2443 int proc_do_large_bitmap(struct ctl_table *table, int write, 2444 void __user *buffer, size_t *lenp, loff_t *ppos) 2445 { 2446 int err = 0; 2447 bool first = 1; 2448 size_t left = *lenp; 2449 unsigned long bitmap_len = table->maxlen; 2450 unsigned long *bitmap = (unsigned long *) table->data; 2451 unsigned long *tmp_bitmap = NULL; 2452 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2453 2454 if (!bitmap_len || !left || (*ppos && !write)) { 2455 *lenp = 0; 2456 return 0; 2457 } 2458 2459 if (write) { 2460 unsigned long page = 0; 2461 char *kbuf; 2462 2463 if (left > PAGE_SIZE - 1) 2464 left = PAGE_SIZE - 1; 2465 2466 page = __get_free_page(GFP_TEMPORARY); 2467 kbuf = (char *) page; 2468 if (!kbuf) 2469 return -ENOMEM; 2470 if (copy_from_user(kbuf, buffer, left)) { 2471 free_page(page); 2472 return -EFAULT; 2473 } 2474 kbuf[left] = 0; 2475 2476 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2477 GFP_KERNEL); 2478 if (!tmp_bitmap) { 2479 free_page(page); 2480 return -ENOMEM; 2481 } 2482 proc_skip_char(&kbuf, &left, '\n'); 2483 while (!err && left) { 2484 unsigned long val_a, val_b; 2485 bool neg; 2486 2487 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2488 sizeof(tr_a), &c); 2489 if (err) 2490 break; 2491 if (val_a >= bitmap_len || neg) { 2492 err = -EINVAL; 2493 break; 2494 } 2495 2496 val_b = val_a; 2497 if (left) { 2498 kbuf++; 2499 left--; 2500 } 2501 2502 if (c == '-') { 2503 err = proc_get_long(&kbuf, &left, &val_b, 2504 &neg, tr_b, sizeof(tr_b), 2505 &c); 2506 if (err) 2507 break; 2508 if (val_b >= bitmap_len || neg || 2509 val_a > val_b) { 2510 err = -EINVAL; 2511 break; 2512 } 2513 if (left) { 2514 kbuf++; 2515 left--; 2516 } 2517 } 2518 2519 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2520 first = 0; 2521 proc_skip_char(&kbuf, &left, '\n'); 2522 } 2523 free_page(page); 2524 } else { 2525 unsigned long bit_a, bit_b = 0; 2526 2527 while (left) { 2528 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2529 if (bit_a >= bitmap_len) 2530 break; 2531 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2532 bit_a + 1) - 1; 2533 2534 if (!first) { 2535 err = proc_put_char(&buffer, &left, ','); 2536 if (err) 2537 break; 2538 } 2539 err = proc_put_long(&buffer, &left, bit_a, false); 2540 if (err) 2541 break; 2542 if (bit_a != bit_b) { 2543 err = proc_put_char(&buffer, &left, '-'); 2544 if (err) 2545 break; 2546 err = proc_put_long(&buffer, &left, bit_b, false); 2547 if (err) 2548 break; 2549 } 2550 2551 first = 0; bit_b++; 2552 } 2553 if (!err) 2554 err = proc_put_char(&buffer, &left, '\n'); 2555 } 2556 2557 if (!err) { 2558 if (write) { 2559 if (*ppos) 2560 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2561 else 2562 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2563 } 2564 kfree(tmp_bitmap); 2565 *lenp -= left; 2566 *ppos += *lenp; 2567 return 0; 2568 } else { 2569 kfree(tmp_bitmap); 2570 return err; 2571 } 2572 } 2573 2574 #else /* CONFIG_PROC_SYSCTL */ 2575 2576 int proc_dostring(struct ctl_table *table, int write, 2577 void __user *buffer, size_t *lenp, loff_t *ppos) 2578 { 2579 return -ENOSYS; 2580 } 2581 2582 int proc_dointvec(struct ctl_table *table, int write, 2583 void __user *buffer, size_t *lenp, loff_t *ppos) 2584 { 2585 return -ENOSYS; 2586 } 2587 2588 int proc_dointvec_minmax(struct ctl_table *table, int write, 2589 void __user *buffer, size_t *lenp, loff_t *ppos) 2590 { 2591 return -ENOSYS; 2592 } 2593 2594 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2595 void __user *buffer, size_t *lenp, loff_t *ppos) 2596 { 2597 return -ENOSYS; 2598 } 2599 2600 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2601 void __user *buffer, size_t *lenp, loff_t *ppos) 2602 { 2603 return -ENOSYS; 2604 } 2605 2606 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2607 void __user *buffer, size_t *lenp, loff_t *ppos) 2608 { 2609 return -ENOSYS; 2610 } 2611 2612 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2613 void __user *buffer, size_t *lenp, loff_t *ppos) 2614 { 2615 return -ENOSYS; 2616 } 2617 2618 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2619 void __user *buffer, 2620 size_t *lenp, loff_t *ppos) 2621 { 2622 return -ENOSYS; 2623 } 2624 2625 2626 #endif /* CONFIG_PROC_SYSCTL */ 2627 2628 /* 2629 * No sense putting this after each symbol definition, twice, 2630 * exception granted :-) 2631 */ 2632 EXPORT_SYMBOL(proc_dointvec); 2633 EXPORT_SYMBOL(proc_dointvec_jiffies); 2634 EXPORT_SYMBOL(proc_dointvec_minmax); 2635 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2636 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2637 EXPORT_SYMBOL(proc_dostring); 2638 EXPORT_SYMBOL(proc_doulongvec_minmax); 2639 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2640