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 max_threads; 99 extern int suid_dumpable; 100 #ifdef CONFIG_COREDUMP 101 extern int core_uses_pid; 102 extern char core_pattern[]; 103 extern unsigned int core_pipe_limit; 104 #endif 105 extern int pid_max; 106 extern int pid_max_min, pid_max_max; 107 extern int percpu_pagelist_fraction; 108 extern int compat_log; 109 extern int latencytop_enabled; 110 extern int sysctl_nr_open_min, sysctl_nr_open_max; 111 #ifndef CONFIG_MMU 112 extern int sysctl_nr_trim_pages; 113 #endif 114 #ifdef CONFIG_BLOCK 115 extern int blk_iopoll_enabled; 116 #endif 117 118 /* Constants used for minimum and maximum */ 119 #ifdef CONFIG_LOCKUP_DETECTOR 120 static int sixty = 60; 121 #endif 122 123 static int zero; 124 static int __maybe_unused one = 1; 125 static int __maybe_unused two = 2; 126 static int __maybe_unused three = 3; 127 static unsigned long one_ul = 1; 128 static int one_hundred = 100; 129 #ifdef CONFIG_PRINTK 130 static int ten_thousand = 10000; 131 #endif 132 133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 135 136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 137 static int maxolduid = 65535; 138 static int minolduid; 139 static int min_percpu_pagelist_fract = 8; 140 141 static int ngroups_max = NGROUPS_MAX; 142 static const int cap_last_cap = CAP_LAST_CAP; 143 144 #ifdef CONFIG_INOTIFY_USER 145 #include <linux/inotify.h> 146 #endif 147 #ifdef CONFIG_SPARC 148 #endif 149 150 #ifdef CONFIG_SPARC64 151 extern int sysctl_tsb_ratio; 152 #endif 153 154 #ifdef __hppa__ 155 extern int pwrsw_enabled; 156 #endif 157 158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 159 extern int unaligned_enabled; 160 #endif 161 162 #ifdef CONFIG_IA64 163 extern int unaligned_dump_stack; 164 #endif 165 166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 167 extern int no_unaligned_warning; 168 #endif 169 170 #ifdef CONFIG_PROC_SYSCTL 171 static int proc_do_cad_pid(struct ctl_table *table, int write, 172 void __user *buffer, size_t *lenp, loff_t *ppos); 173 static int proc_taint(struct ctl_table *table, int write, 174 void __user *buffer, size_t *lenp, loff_t *ppos); 175 #endif 176 177 #ifdef CONFIG_PRINTK 178 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 179 void __user *buffer, size_t *lenp, loff_t *ppos); 180 #endif 181 182 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 183 void __user *buffer, size_t *lenp, loff_t *ppos); 184 #ifdef CONFIG_COREDUMP 185 static int proc_dostring_coredump(struct ctl_table *table, int write, 186 void __user *buffer, size_t *lenp, loff_t *ppos); 187 #endif 188 189 #ifdef CONFIG_MAGIC_SYSRQ 190 /* Note: sysrq code uses it's own private copy */ 191 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 192 193 static int sysrq_sysctl_handler(ctl_table *table, int write, 194 void __user *buffer, size_t *lenp, 195 loff_t *ppos) 196 { 197 int error; 198 199 error = proc_dointvec(table, write, buffer, lenp, ppos); 200 if (error) 201 return error; 202 203 if (write) 204 sysrq_toggle_support(__sysrq_enabled); 205 206 return 0; 207 } 208 209 #endif 210 211 static struct ctl_table kern_table[]; 212 static struct ctl_table vm_table[]; 213 static struct ctl_table fs_table[]; 214 static struct ctl_table debug_table[]; 215 static struct ctl_table dev_table[]; 216 extern struct ctl_table random_table[]; 217 #ifdef CONFIG_EPOLL 218 extern struct ctl_table epoll_table[]; 219 #endif 220 221 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 222 int sysctl_legacy_va_layout; 223 #endif 224 225 /* The default sysctl tables: */ 226 227 static struct ctl_table sysctl_base_table[] = { 228 { 229 .procname = "kernel", 230 .mode = 0555, 231 .child = kern_table, 232 }, 233 { 234 .procname = "vm", 235 .mode = 0555, 236 .child = vm_table, 237 }, 238 { 239 .procname = "fs", 240 .mode = 0555, 241 .child = fs_table, 242 }, 243 { 244 .procname = "debug", 245 .mode = 0555, 246 .child = debug_table, 247 }, 248 { 249 .procname = "dev", 250 .mode = 0555, 251 .child = dev_table, 252 }, 253 { } 254 }; 255 256 #ifdef CONFIG_SCHED_DEBUG 257 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 258 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 259 static int min_wakeup_granularity_ns; /* 0 usecs */ 260 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 261 #ifdef CONFIG_SMP 262 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 263 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 264 #endif /* CONFIG_SMP */ 265 #endif /* CONFIG_SCHED_DEBUG */ 266 267 #ifdef CONFIG_COMPACTION 268 static int min_extfrag_threshold; 269 static int max_extfrag_threshold = 1000; 270 #endif 271 272 static struct ctl_table kern_table[] = { 273 { 274 .procname = "sched_child_runs_first", 275 .data = &sysctl_sched_child_runs_first, 276 .maxlen = sizeof(unsigned int), 277 .mode = 0644, 278 .proc_handler = proc_dointvec, 279 }, 280 #ifdef CONFIG_SCHED_DEBUG 281 { 282 .procname = "sched_min_granularity_ns", 283 .data = &sysctl_sched_min_granularity, 284 .maxlen = sizeof(unsigned int), 285 .mode = 0644, 286 .proc_handler = sched_proc_update_handler, 287 .extra1 = &min_sched_granularity_ns, 288 .extra2 = &max_sched_granularity_ns, 289 }, 290 { 291 .procname = "sched_latency_ns", 292 .data = &sysctl_sched_latency, 293 .maxlen = sizeof(unsigned int), 294 .mode = 0644, 295 .proc_handler = sched_proc_update_handler, 296 .extra1 = &min_sched_granularity_ns, 297 .extra2 = &max_sched_granularity_ns, 298 }, 299 { 300 .procname = "sched_wakeup_granularity_ns", 301 .data = &sysctl_sched_wakeup_granularity, 302 .maxlen = sizeof(unsigned int), 303 .mode = 0644, 304 .proc_handler = sched_proc_update_handler, 305 .extra1 = &min_wakeup_granularity_ns, 306 .extra2 = &max_wakeup_granularity_ns, 307 }, 308 #ifdef CONFIG_SMP 309 { 310 .procname = "sched_tunable_scaling", 311 .data = &sysctl_sched_tunable_scaling, 312 .maxlen = sizeof(enum sched_tunable_scaling), 313 .mode = 0644, 314 .proc_handler = sched_proc_update_handler, 315 .extra1 = &min_sched_tunable_scaling, 316 .extra2 = &max_sched_tunable_scaling, 317 }, 318 { 319 .procname = "sched_migration_cost_ns", 320 .data = &sysctl_sched_migration_cost, 321 .maxlen = sizeof(unsigned int), 322 .mode = 0644, 323 .proc_handler = proc_dointvec, 324 }, 325 { 326 .procname = "sched_nr_migrate", 327 .data = &sysctl_sched_nr_migrate, 328 .maxlen = sizeof(unsigned int), 329 .mode = 0644, 330 .proc_handler = proc_dointvec, 331 }, 332 { 333 .procname = "sched_time_avg_ms", 334 .data = &sysctl_sched_time_avg, 335 .maxlen = sizeof(unsigned int), 336 .mode = 0644, 337 .proc_handler = proc_dointvec, 338 }, 339 { 340 .procname = "sched_shares_window_ns", 341 .data = &sysctl_sched_shares_window, 342 .maxlen = sizeof(unsigned int), 343 .mode = 0644, 344 .proc_handler = proc_dointvec, 345 }, 346 { 347 .procname = "timer_migration", 348 .data = &sysctl_timer_migration, 349 .maxlen = sizeof(unsigned int), 350 .mode = 0644, 351 .proc_handler = proc_dointvec_minmax, 352 .extra1 = &zero, 353 .extra2 = &one, 354 }, 355 #endif /* CONFIG_SMP */ 356 #ifdef CONFIG_NUMA_BALANCING 357 { 358 .procname = "numa_balancing_scan_delay_ms", 359 .data = &sysctl_numa_balancing_scan_delay, 360 .maxlen = sizeof(unsigned int), 361 .mode = 0644, 362 .proc_handler = proc_dointvec, 363 }, 364 { 365 .procname = "numa_balancing_scan_period_min_ms", 366 .data = &sysctl_numa_balancing_scan_period_min, 367 .maxlen = sizeof(unsigned int), 368 .mode = 0644, 369 .proc_handler = proc_dointvec, 370 }, 371 { 372 .procname = "numa_balancing_scan_period_max_ms", 373 .data = &sysctl_numa_balancing_scan_period_max, 374 .maxlen = sizeof(unsigned int), 375 .mode = 0644, 376 .proc_handler = proc_dointvec, 377 }, 378 { 379 .procname = "numa_balancing_scan_size_mb", 380 .data = &sysctl_numa_balancing_scan_size, 381 .maxlen = sizeof(unsigned int), 382 .mode = 0644, 383 .proc_handler = proc_dointvec, 384 }, 385 { 386 .procname = "numa_balancing_migrate_deferred", 387 .data = &sysctl_numa_balancing_migrate_deferred, 388 .maxlen = sizeof(unsigned int), 389 .mode = 0644, 390 .proc_handler = proc_dointvec, 391 }, 392 { 393 .procname = "numa_balancing", 394 .data = NULL, /* filled in by handler */ 395 .maxlen = sizeof(unsigned int), 396 .mode = 0644, 397 .proc_handler = sysctl_numa_balancing, 398 .extra1 = &zero, 399 .extra2 = &one, 400 }, 401 #endif /* CONFIG_NUMA_BALANCING */ 402 #endif /* CONFIG_SCHED_DEBUG */ 403 { 404 .procname = "sched_rt_period_us", 405 .data = &sysctl_sched_rt_period, 406 .maxlen = sizeof(unsigned int), 407 .mode = 0644, 408 .proc_handler = sched_rt_handler, 409 }, 410 { 411 .procname = "sched_rt_runtime_us", 412 .data = &sysctl_sched_rt_runtime, 413 .maxlen = sizeof(int), 414 .mode = 0644, 415 .proc_handler = sched_rt_handler, 416 }, 417 { 418 .procname = "sched_rr_timeslice_ms", 419 .data = &sched_rr_timeslice, 420 .maxlen = sizeof(int), 421 .mode = 0644, 422 .proc_handler = sched_rr_handler, 423 }, 424 #ifdef CONFIG_SCHED_AUTOGROUP 425 { 426 .procname = "sched_autogroup_enabled", 427 .data = &sysctl_sched_autogroup_enabled, 428 .maxlen = sizeof(unsigned int), 429 .mode = 0644, 430 .proc_handler = proc_dointvec_minmax, 431 .extra1 = &zero, 432 .extra2 = &one, 433 }, 434 #endif 435 #ifdef CONFIG_CFS_BANDWIDTH 436 { 437 .procname = "sched_cfs_bandwidth_slice_us", 438 .data = &sysctl_sched_cfs_bandwidth_slice, 439 .maxlen = sizeof(unsigned int), 440 .mode = 0644, 441 .proc_handler = proc_dointvec_minmax, 442 .extra1 = &one, 443 }, 444 #endif 445 #ifdef CONFIG_PROVE_LOCKING 446 { 447 .procname = "prove_locking", 448 .data = &prove_locking, 449 .maxlen = sizeof(int), 450 .mode = 0644, 451 .proc_handler = proc_dointvec, 452 }, 453 #endif 454 #ifdef CONFIG_LOCK_STAT 455 { 456 .procname = "lock_stat", 457 .data = &lock_stat, 458 .maxlen = sizeof(int), 459 .mode = 0644, 460 .proc_handler = proc_dointvec, 461 }, 462 #endif 463 { 464 .procname = "panic", 465 .data = &panic_timeout, 466 .maxlen = sizeof(int), 467 .mode = 0644, 468 .proc_handler = proc_dointvec, 469 }, 470 #ifdef CONFIG_COREDUMP 471 { 472 .procname = "core_uses_pid", 473 .data = &core_uses_pid, 474 .maxlen = sizeof(int), 475 .mode = 0644, 476 .proc_handler = proc_dointvec, 477 }, 478 { 479 .procname = "core_pattern", 480 .data = core_pattern, 481 .maxlen = CORENAME_MAX_SIZE, 482 .mode = 0644, 483 .proc_handler = proc_dostring_coredump, 484 }, 485 { 486 .procname = "core_pipe_limit", 487 .data = &core_pipe_limit, 488 .maxlen = sizeof(unsigned int), 489 .mode = 0644, 490 .proc_handler = proc_dointvec, 491 }, 492 #endif 493 #ifdef CONFIG_PROC_SYSCTL 494 { 495 .procname = "tainted", 496 .maxlen = sizeof(long), 497 .mode = 0644, 498 .proc_handler = proc_taint, 499 }, 500 #endif 501 #ifdef CONFIG_LATENCYTOP 502 { 503 .procname = "latencytop", 504 .data = &latencytop_enabled, 505 .maxlen = sizeof(int), 506 .mode = 0644, 507 .proc_handler = proc_dointvec, 508 }, 509 #endif 510 #ifdef CONFIG_BLK_DEV_INITRD 511 { 512 .procname = "real-root-dev", 513 .data = &real_root_dev, 514 .maxlen = sizeof(int), 515 .mode = 0644, 516 .proc_handler = proc_dointvec, 517 }, 518 #endif 519 { 520 .procname = "print-fatal-signals", 521 .data = &print_fatal_signals, 522 .maxlen = sizeof(int), 523 .mode = 0644, 524 .proc_handler = proc_dointvec, 525 }, 526 #ifdef CONFIG_SPARC 527 { 528 .procname = "reboot-cmd", 529 .data = reboot_command, 530 .maxlen = 256, 531 .mode = 0644, 532 .proc_handler = proc_dostring, 533 }, 534 { 535 .procname = "stop-a", 536 .data = &stop_a_enabled, 537 .maxlen = sizeof (int), 538 .mode = 0644, 539 .proc_handler = proc_dointvec, 540 }, 541 { 542 .procname = "scons-poweroff", 543 .data = &scons_pwroff, 544 .maxlen = sizeof (int), 545 .mode = 0644, 546 .proc_handler = proc_dointvec, 547 }, 548 #endif 549 #ifdef CONFIG_SPARC64 550 { 551 .procname = "tsb-ratio", 552 .data = &sysctl_tsb_ratio, 553 .maxlen = sizeof (int), 554 .mode = 0644, 555 .proc_handler = proc_dointvec, 556 }, 557 #endif 558 #ifdef __hppa__ 559 { 560 .procname = "soft-power", 561 .data = &pwrsw_enabled, 562 .maxlen = sizeof (int), 563 .mode = 0644, 564 .proc_handler = proc_dointvec, 565 }, 566 #endif 567 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 568 { 569 .procname = "unaligned-trap", 570 .data = &unaligned_enabled, 571 .maxlen = sizeof (int), 572 .mode = 0644, 573 .proc_handler = proc_dointvec, 574 }, 575 #endif 576 { 577 .procname = "ctrl-alt-del", 578 .data = &C_A_D, 579 .maxlen = sizeof(int), 580 .mode = 0644, 581 .proc_handler = proc_dointvec, 582 }, 583 #ifdef CONFIG_FUNCTION_TRACER 584 { 585 .procname = "ftrace_enabled", 586 .data = &ftrace_enabled, 587 .maxlen = sizeof(int), 588 .mode = 0644, 589 .proc_handler = ftrace_enable_sysctl, 590 }, 591 #endif 592 #ifdef CONFIG_STACK_TRACER 593 { 594 .procname = "stack_tracer_enabled", 595 .data = &stack_tracer_enabled, 596 .maxlen = sizeof(int), 597 .mode = 0644, 598 .proc_handler = stack_trace_sysctl, 599 }, 600 #endif 601 #ifdef CONFIG_TRACING 602 { 603 .procname = "ftrace_dump_on_oops", 604 .data = &ftrace_dump_on_oops, 605 .maxlen = sizeof(int), 606 .mode = 0644, 607 .proc_handler = proc_dointvec, 608 }, 609 { 610 .procname = "traceoff_on_warning", 611 .data = &__disable_trace_on_warning, 612 .maxlen = sizeof(__disable_trace_on_warning), 613 .mode = 0644, 614 .proc_handler = proc_dointvec, 615 }, 616 #endif 617 #ifdef CONFIG_MODULES 618 { 619 .procname = "modprobe", 620 .data = &modprobe_path, 621 .maxlen = KMOD_PATH_LEN, 622 .mode = 0644, 623 .proc_handler = proc_dostring, 624 }, 625 { 626 .procname = "modules_disabled", 627 .data = &modules_disabled, 628 .maxlen = sizeof(int), 629 .mode = 0644, 630 /* only handle a transition from default "0" to "1" */ 631 .proc_handler = proc_dointvec_minmax, 632 .extra1 = &one, 633 .extra2 = &one, 634 }, 635 #endif 636 637 { 638 .procname = "hotplug", 639 .data = &uevent_helper, 640 .maxlen = UEVENT_HELPER_PATH_LEN, 641 .mode = 0644, 642 .proc_handler = proc_dostring, 643 }, 644 645 #ifdef CONFIG_CHR_DEV_SG 646 { 647 .procname = "sg-big-buff", 648 .data = &sg_big_buff, 649 .maxlen = sizeof (int), 650 .mode = 0444, 651 .proc_handler = proc_dointvec, 652 }, 653 #endif 654 #ifdef CONFIG_BSD_PROCESS_ACCT 655 { 656 .procname = "acct", 657 .data = &acct_parm, 658 .maxlen = 3*sizeof(int), 659 .mode = 0644, 660 .proc_handler = proc_dointvec, 661 }, 662 #endif 663 #ifdef CONFIG_MAGIC_SYSRQ 664 { 665 .procname = "sysrq", 666 .data = &__sysrq_enabled, 667 .maxlen = sizeof (int), 668 .mode = 0644, 669 .proc_handler = sysrq_sysctl_handler, 670 }, 671 #endif 672 #ifdef CONFIG_PROC_SYSCTL 673 { 674 .procname = "cad_pid", 675 .data = NULL, 676 .maxlen = sizeof (int), 677 .mode = 0600, 678 .proc_handler = proc_do_cad_pid, 679 }, 680 #endif 681 { 682 .procname = "threads-max", 683 .data = &max_threads, 684 .maxlen = sizeof(int), 685 .mode = 0644, 686 .proc_handler = proc_dointvec, 687 }, 688 { 689 .procname = "random", 690 .mode = 0555, 691 .child = random_table, 692 }, 693 { 694 .procname = "usermodehelper", 695 .mode = 0555, 696 .child = usermodehelper_table, 697 }, 698 { 699 .procname = "overflowuid", 700 .data = &overflowuid, 701 .maxlen = sizeof(int), 702 .mode = 0644, 703 .proc_handler = proc_dointvec_minmax, 704 .extra1 = &minolduid, 705 .extra2 = &maxolduid, 706 }, 707 { 708 .procname = "overflowgid", 709 .data = &overflowgid, 710 .maxlen = sizeof(int), 711 .mode = 0644, 712 .proc_handler = proc_dointvec_minmax, 713 .extra1 = &minolduid, 714 .extra2 = &maxolduid, 715 }, 716 #ifdef CONFIG_S390 717 #ifdef CONFIG_MATHEMU 718 { 719 .procname = "ieee_emulation_warnings", 720 .data = &sysctl_ieee_emulation_warnings, 721 .maxlen = sizeof(int), 722 .mode = 0644, 723 .proc_handler = proc_dointvec, 724 }, 725 #endif 726 { 727 .procname = "userprocess_debug", 728 .data = &show_unhandled_signals, 729 .maxlen = sizeof(int), 730 .mode = 0644, 731 .proc_handler = proc_dointvec, 732 }, 733 #endif 734 { 735 .procname = "pid_max", 736 .data = &pid_max, 737 .maxlen = sizeof (int), 738 .mode = 0644, 739 .proc_handler = proc_dointvec_minmax, 740 .extra1 = &pid_max_min, 741 .extra2 = &pid_max_max, 742 }, 743 { 744 .procname = "panic_on_oops", 745 .data = &panic_on_oops, 746 .maxlen = sizeof(int), 747 .mode = 0644, 748 .proc_handler = proc_dointvec, 749 }, 750 #if defined CONFIG_PRINTK 751 { 752 .procname = "printk", 753 .data = &console_loglevel, 754 .maxlen = 4*sizeof(int), 755 .mode = 0644, 756 .proc_handler = proc_dointvec, 757 }, 758 { 759 .procname = "printk_ratelimit", 760 .data = &printk_ratelimit_state.interval, 761 .maxlen = sizeof(int), 762 .mode = 0644, 763 .proc_handler = proc_dointvec_jiffies, 764 }, 765 { 766 .procname = "printk_ratelimit_burst", 767 .data = &printk_ratelimit_state.burst, 768 .maxlen = sizeof(int), 769 .mode = 0644, 770 .proc_handler = proc_dointvec, 771 }, 772 { 773 .procname = "printk_delay", 774 .data = &printk_delay_msec, 775 .maxlen = sizeof(int), 776 .mode = 0644, 777 .proc_handler = proc_dointvec_minmax, 778 .extra1 = &zero, 779 .extra2 = &ten_thousand, 780 }, 781 { 782 .procname = "dmesg_restrict", 783 .data = &dmesg_restrict, 784 .maxlen = sizeof(int), 785 .mode = 0644, 786 .proc_handler = proc_dointvec_minmax_sysadmin, 787 .extra1 = &zero, 788 .extra2 = &one, 789 }, 790 { 791 .procname = "kptr_restrict", 792 .data = &kptr_restrict, 793 .maxlen = sizeof(int), 794 .mode = 0644, 795 .proc_handler = proc_dointvec_minmax_sysadmin, 796 .extra1 = &zero, 797 .extra2 = &two, 798 }, 799 #endif 800 { 801 .procname = "ngroups_max", 802 .data = &ngroups_max, 803 .maxlen = sizeof (int), 804 .mode = 0444, 805 .proc_handler = proc_dointvec, 806 }, 807 { 808 .procname = "cap_last_cap", 809 .data = (void *)&cap_last_cap, 810 .maxlen = sizeof(int), 811 .mode = 0444, 812 .proc_handler = proc_dointvec, 813 }, 814 #if defined(CONFIG_LOCKUP_DETECTOR) 815 { 816 .procname = "watchdog", 817 .data = &watchdog_user_enabled, 818 .maxlen = sizeof (int), 819 .mode = 0644, 820 .proc_handler = proc_dowatchdog, 821 .extra1 = &zero, 822 .extra2 = &one, 823 }, 824 { 825 .procname = "watchdog_thresh", 826 .data = &watchdog_thresh, 827 .maxlen = sizeof(int), 828 .mode = 0644, 829 .proc_handler = proc_dowatchdog, 830 .extra1 = &zero, 831 .extra2 = &sixty, 832 }, 833 { 834 .procname = "softlockup_panic", 835 .data = &softlockup_panic, 836 .maxlen = sizeof(int), 837 .mode = 0644, 838 .proc_handler = proc_dointvec_minmax, 839 .extra1 = &zero, 840 .extra2 = &one, 841 }, 842 { 843 .procname = "nmi_watchdog", 844 .data = &watchdog_user_enabled, 845 .maxlen = sizeof (int), 846 .mode = 0644, 847 .proc_handler = proc_dowatchdog, 848 .extra1 = &zero, 849 .extra2 = &one, 850 }, 851 #endif 852 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 853 { 854 .procname = "unknown_nmi_panic", 855 .data = &unknown_nmi_panic, 856 .maxlen = sizeof (int), 857 .mode = 0644, 858 .proc_handler = proc_dointvec, 859 }, 860 #endif 861 #if defined(CONFIG_X86) 862 { 863 .procname = "panic_on_unrecovered_nmi", 864 .data = &panic_on_unrecovered_nmi, 865 .maxlen = sizeof(int), 866 .mode = 0644, 867 .proc_handler = proc_dointvec, 868 }, 869 { 870 .procname = "panic_on_io_nmi", 871 .data = &panic_on_io_nmi, 872 .maxlen = sizeof(int), 873 .mode = 0644, 874 .proc_handler = proc_dointvec, 875 }, 876 #ifdef CONFIG_DEBUG_STACKOVERFLOW 877 { 878 .procname = "panic_on_stackoverflow", 879 .data = &sysctl_panic_on_stackoverflow, 880 .maxlen = sizeof(int), 881 .mode = 0644, 882 .proc_handler = proc_dointvec, 883 }, 884 #endif 885 { 886 .procname = "bootloader_type", 887 .data = &bootloader_type, 888 .maxlen = sizeof (int), 889 .mode = 0444, 890 .proc_handler = proc_dointvec, 891 }, 892 { 893 .procname = "bootloader_version", 894 .data = &bootloader_version, 895 .maxlen = sizeof (int), 896 .mode = 0444, 897 .proc_handler = proc_dointvec, 898 }, 899 { 900 .procname = "kstack_depth_to_print", 901 .data = &kstack_depth_to_print, 902 .maxlen = sizeof(int), 903 .mode = 0644, 904 .proc_handler = proc_dointvec, 905 }, 906 { 907 .procname = "io_delay_type", 908 .data = &io_delay_type, 909 .maxlen = sizeof(int), 910 .mode = 0644, 911 .proc_handler = proc_dointvec, 912 }, 913 #endif 914 #if defined(CONFIG_MMU) 915 { 916 .procname = "randomize_va_space", 917 .data = &randomize_va_space, 918 .maxlen = sizeof(int), 919 .mode = 0644, 920 .proc_handler = proc_dointvec, 921 }, 922 #endif 923 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 924 { 925 .procname = "spin_retry", 926 .data = &spin_retry, 927 .maxlen = sizeof (int), 928 .mode = 0644, 929 .proc_handler = proc_dointvec, 930 }, 931 #endif 932 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 933 { 934 .procname = "acpi_video_flags", 935 .data = &acpi_realmode_flags, 936 .maxlen = sizeof (unsigned long), 937 .mode = 0644, 938 .proc_handler = proc_doulongvec_minmax, 939 }, 940 #endif 941 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 942 { 943 .procname = "ignore-unaligned-usertrap", 944 .data = &no_unaligned_warning, 945 .maxlen = sizeof (int), 946 .mode = 0644, 947 .proc_handler = proc_dointvec, 948 }, 949 #endif 950 #ifdef CONFIG_IA64 951 { 952 .procname = "unaligned-dump-stack", 953 .data = &unaligned_dump_stack, 954 .maxlen = sizeof (int), 955 .mode = 0644, 956 .proc_handler = proc_dointvec, 957 }, 958 #endif 959 #ifdef CONFIG_DETECT_HUNG_TASK 960 { 961 .procname = "hung_task_panic", 962 .data = &sysctl_hung_task_panic, 963 .maxlen = sizeof(int), 964 .mode = 0644, 965 .proc_handler = proc_dointvec_minmax, 966 .extra1 = &zero, 967 .extra2 = &one, 968 }, 969 { 970 .procname = "hung_task_check_count", 971 .data = &sysctl_hung_task_check_count, 972 .maxlen = sizeof(int), 973 .mode = 0644, 974 .proc_handler = proc_dointvec_minmax, 975 .extra1 = &zero, 976 }, 977 { 978 .procname = "hung_task_timeout_secs", 979 .data = &sysctl_hung_task_timeout_secs, 980 .maxlen = sizeof(unsigned long), 981 .mode = 0644, 982 .proc_handler = proc_dohung_task_timeout_secs, 983 }, 984 { 985 .procname = "hung_task_warnings", 986 .data = &sysctl_hung_task_warnings, 987 .maxlen = sizeof(unsigned long), 988 .mode = 0644, 989 .proc_handler = proc_doulongvec_minmax, 990 }, 991 #endif 992 #ifdef CONFIG_COMPAT 993 { 994 .procname = "compat-log", 995 .data = &compat_log, 996 .maxlen = sizeof (int), 997 .mode = 0644, 998 .proc_handler = proc_dointvec, 999 }, 1000 #endif 1001 #ifdef CONFIG_RT_MUTEXES 1002 { 1003 .procname = "max_lock_depth", 1004 .data = &max_lock_depth, 1005 .maxlen = sizeof(int), 1006 .mode = 0644, 1007 .proc_handler = proc_dointvec, 1008 }, 1009 #endif 1010 { 1011 .procname = "poweroff_cmd", 1012 .data = &poweroff_cmd, 1013 .maxlen = POWEROFF_CMD_PATH_LEN, 1014 .mode = 0644, 1015 .proc_handler = proc_dostring, 1016 }, 1017 #ifdef CONFIG_KEYS 1018 { 1019 .procname = "keys", 1020 .mode = 0555, 1021 .child = key_sysctls, 1022 }, 1023 #endif 1024 #ifdef CONFIG_RCU_TORTURE_TEST 1025 { 1026 .procname = "rcutorture_runnable", 1027 .data = &rcutorture_runnable, 1028 .maxlen = sizeof(int), 1029 .mode = 0644, 1030 .proc_handler = proc_dointvec, 1031 }, 1032 #endif 1033 #ifdef CONFIG_PERF_EVENTS 1034 /* 1035 * User-space scripts rely on the existence of this file 1036 * as a feature check for perf_events being enabled. 1037 * 1038 * So it's an ABI, do not remove! 1039 */ 1040 { 1041 .procname = "perf_event_paranoid", 1042 .data = &sysctl_perf_event_paranoid, 1043 .maxlen = sizeof(sysctl_perf_event_paranoid), 1044 .mode = 0644, 1045 .proc_handler = proc_dointvec, 1046 }, 1047 { 1048 .procname = "perf_event_mlock_kb", 1049 .data = &sysctl_perf_event_mlock, 1050 .maxlen = sizeof(sysctl_perf_event_mlock), 1051 .mode = 0644, 1052 .proc_handler = proc_dointvec, 1053 }, 1054 { 1055 .procname = "perf_event_max_sample_rate", 1056 .data = &sysctl_perf_event_sample_rate, 1057 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1058 .mode = 0644, 1059 .proc_handler = perf_proc_update_handler, 1060 .extra1 = &one, 1061 }, 1062 { 1063 .procname = "perf_cpu_time_max_percent", 1064 .data = &sysctl_perf_cpu_time_max_percent, 1065 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1066 .mode = 0644, 1067 .proc_handler = perf_cpu_time_max_percent_handler, 1068 .extra1 = &zero, 1069 .extra2 = &one_hundred, 1070 }, 1071 #endif 1072 #ifdef CONFIG_KMEMCHECK 1073 { 1074 .procname = "kmemcheck", 1075 .data = &kmemcheck_enabled, 1076 .maxlen = sizeof(int), 1077 .mode = 0644, 1078 .proc_handler = proc_dointvec, 1079 }, 1080 #endif 1081 #ifdef CONFIG_BLOCK 1082 { 1083 .procname = "blk_iopoll", 1084 .data = &blk_iopoll_enabled, 1085 .maxlen = sizeof(int), 1086 .mode = 0644, 1087 .proc_handler = proc_dointvec, 1088 }, 1089 #endif 1090 { } 1091 }; 1092 1093 static struct ctl_table vm_table[] = { 1094 { 1095 .procname = "overcommit_memory", 1096 .data = &sysctl_overcommit_memory, 1097 .maxlen = sizeof(sysctl_overcommit_memory), 1098 .mode = 0644, 1099 .proc_handler = proc_dointvec_minmax, 1100 .extra1 = &zero, 1101 .extra2 = &two, 1102 }, 1103 { 1104 .procname = "panic_on_oom", 1105 .data = &sysctl_panic_on_oom, 1106 .maxlen = sizeof(sysctl_panic_on_oom), 1107 .mode = 0644, 1108 .proc_handler = proc_dointvec_minmax, 1109 .extra1 = &zero, 1110 .extra2 = &two, 1111 }, 1112 { 1113 .procname = "oom_kill_allocating_task", 1114 .data = &sysctl_oom_kill_allocating_task, 1115 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1116 .mode = 0644, 1117 .proc_handler = proc_dointvec, 1118 }, 1119 { 1120 .procname = "oom_dump_tasks", 1121 .data = &sysctl_oom_dump_tasks, 1122 .maxlen = sizeof(sysctl_oom_dump_tasks), 1123 .mode = 0644, 1124 .proc_handler = proc_dointvec, 1125 }, 1126 { 1127 .procname = "overcommit_ratio", 1128 .data = &sysctl_overcommit_ratio, 1129 .maxlen = sizeof(sysctl_overcommit_ratio), 1130 .mode = 0644, 1131 .proc_handler = overcommit_ratio_handler, 1132 }, 1133 { 1134 .procname = "overcommit_kbytes", 1135 .data = &sysctl_overcommit_kbytes, 1136 .maxlen = sizeof(sysctl_overcommit_kbytes), 1137 .mode = 0644, 1138 .proc_handler = overcommit_kbytes_handler, 1139 }, 1140 { 1141 .procname = "page-cluster", 1142 .data = &page_cluster, 1143 .maxlen = sizeof(int), 1144 .mode = 0644, 1145 .proc_handler = proc_dointvec_minmax, 1146 .extra1 = &zero, 1147 }, 1148 { 1149 .procname = "dirty_background_ratio", 1150 .data = &dirty_background_ratio, 1151 .maxlen = sizeof(dirty_background_ratio), 1152 .mode = 0644, 1153 .proc_handler = dirty_background_ratio_handler, 1154 .extra1 = &zero, 1155 .extra2 = &one_hundred, 1156 }, 1157 { 1158 .procname = "dirty_background_bytes", 1159 .data = &dirty_background_bytes, 1160 .maxlen = sizeof(dirty_background_bytes), 1161 .mode = 0644, 1162 .proc_handler = dirty_background_bytes_handler, 1163 .extra1 = &one_ul, 1164 }, 1165 { 1166 .procname = "dirty_ratio", 1167 .data = &vm_dirty_ratio, 1168 .maxlen = sizeof(vm_dirty_ratio), 1169 .mode = 0644, 1170 .proc_handler = dirty_ratio_handler, 1171 .extra1 = &zero, 1172 .extra2 = &one_hundred, 1173 }, 1174 { 1175 .procname = "dirty_bytes", 1176 .data = &vm_dirty_bytes, 1177 .maxlen = sizeof(vm_dirty_bytes), 1178 .mode = 0644, 1179 .proc_handler = dirty_bytes_handler, 1180 .extra1 = &dirty_bytes_min, 1181 }, 1182 { 1183 .procname = "dirty_writeback_centisecs", 1184 .data = &dirty_writeback_interval, 1185 .maxlen = sizeof(dirty_writeback_interval), 1186 .mode = 0644, 1187 .proc_handler = dirty_writeback_centisecs_handler, 1188 }, 1189 { 1190 .procname = "dirty_expire_centisecs", 1191 .data = &dirty_expire_interval, 1192 .maxlen = sizeof(dirty_expire_interval), 1193 .mode = 0644, 1194 .proc_handler = proc_dointvec_minmax, 1195 .extra1 = &zero, 1196 }, 1197 { 1198 .procname = "nr_pdflush_threads", 1199 .mode = 0444 /* read-only */, 1200 .proc_handler = pdflush_proc_obsolete, 1201 }, 1202 { 1203 .procname = "swappiness", 1204 .data = &vm_swappiness, 1205 .maxlen = sizeof(vm_swappiness), 1206 .mode = 0644, 1207 .proc_handler = proc_dointvec_minmax, 1208 .extra1 = &zero, 1209 .extra2 = &one_hundred, 1210 }, 1211 #ifdef CONFIG_HUGETLB_PAGE 1212 { 1213 .procname = "nr_hugepages", 1214 .data = NULL, 1215 .maxlen = sizeof(unsigned long), 1216 .mode = 0644, 1217 .proc_handler = hugetlb_sysctl_handler, 1218 .extra1 = (void *)&hugetlb_zero, 1219 .extra2 = (void *)&hugetlb_infinity, 1220 }, 1221 #ifdef CONFIG_NUMA 1222 { 1223 .procname = "nr_hugepages_mempolicy", 1224 .data = NULL, 1225 .maxlen = sizeof(unsigned long), 1226 .mode = 0644, 1227 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1228 .extra1 = (void *)&hugetlb_zero, 1229 .extra2 = (void *)&hugetlb_infinity, 1230 }, 1231 #endif 1232 { 1233 .procname = "hugetlb_shm_group", 1234 .data = &sysctl_hugetlb_shm_group, 1235 .maxlen = sizeof(gid_t), 1236 .mode = 0644, 1237 .proc_handler = proc_dointvec, 1238 }, 1239 { 1240 .procname = "hugepages_treat_as_movable", 1241 .data = &hugepages_treat_as_movable, 1242 .maxlen = sizeof(int), 1243 .mode = 0644, 1244 .proc_handler = proc_dointvec, 1245 }, 1246 { 1247 .procname = "nr_overcommit_hugepages", 1248 .data = NULL, 1249 .maxlen = sizeof(unsigned long), 1250 .mode = 0644, 1251 .proc_handler = hugetlb_overcommit_handler, 1252 .extra1 = (void *)&hugetlb_zero, 1253 .extra2 = (void *)&hugetlb_infinity, 1254 }, 1255 #endif 1256 { 1257 .procname = "lowmem_reserve_ratio", 1258 .data = &sysctl_lowmem_reserve_ratio, 1259 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1260 .mode = 0644, 1261 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1262 }, 1263 { 1264 .procname = "drop_caches", 1265 .data = &sysctl_drop_caches, 1266 .maxlen = sizeof(int), 1267 .mode = 0644, 1268 .proc_handler = drop_caches_sysctl_handler, 1269 .extra1 = &one, 1270 .extra2 = &three, 1271 }, 1272 #ifdef CONFIG_COMPACTION 1273 { 1274 .procname = "compact_memory", 1275 .data = &sysctl_compact_memory, 1276 .maxlen = sizeof(int), 1277 .mode = 0200, 1278 .proc_handler = sysctl_compaction_handler, 1279 }, 1280 { 1281 .procname = "extfrag_threshold", 1282 .data = &sysctl_extfrag_threshold, 1283 .maxlen = sizeof(int), 1284 .mode = 0644, 1285 .proc_handler = sysctl_extfrag_handler, 1286 .extra1 = &min_extfrag_threshold, 1287 .extra2 = &max_extfrag_threshold, 1288 }, 1289 1290 #endif /* CONFIG_COMPACTION */ 1291 { 1292 .procname = "min_free_kbytes", 1293 .data = &min_free_kbytes, 1294 .maxlen = sizeof(min_free_kbytes), 1295 .mode = 0644, 1296 .proc_handler = min_free_kbytes_sysctl_handler, 1297 .extra1 = &zero, 1298 }, 1299 { 1300 .procname = "percpu_pagelist_fraction", 1301 .data = &percpu_pagelist_fraction, 1302 .maxlen = sizeof(percpu_pagelist_fraction), 1303 .mode = 0644, 1304 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1305 .extra1 = &min_percpu_pagelist_fract, 1306 }, 1307 #ifdef CONFIG_MMU 1308 { 1309 .procname = "max_map_count", 1310 .data = &sysctl_max_map_count, 1311 .maxlen = sizeof(sysctl_max_map_count), 1312 .mode = 0644, 1313 .proc_handler = proc_dointvec_minmax, 1314 .extra1 = &zero, 1315 }, 1316 #else 1317 { 1318 .procname = "nr_trim_pages", 1319 .data = &sysctl_nr_trim_pages, 1320 .maxlen = sizeof(sysctl_nr_trim_pages), 1321 .mode = 0644, 1322 .proc_handler = proc_dointvec_minmax, 1323 .extra1 = &zero, 1324 }, 1325 #endif 1326 { 1327 .procname = "laptop_mode", 1328 .data = &laptop_mode, 1329 .maxlen = sizeof(laptop_mode), 1330 .mode = 0644, 1331 .proc_handler = proc_dointvec_jiffies, 1332 }, 1333 { 1334 .procname = "block_dump", 1335 .data = &block_dump, 1336 .maxlen = sizeof(block_dump), 1337 .mode = 0644, 1338 .proc_handler = proc_dointvec, 1339 .extra1 = &zero, 1340 }, 1341 { 1342 .procname = "vfs_cache_pressure", 1343 .data = &sysctl_vfs_cache_pressure, 1344 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1345 .mode = 0644, 1346 .proc_handler = proc_dointvec, 1347 .extra1 = &zero, 1348 }, 1349 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1350 { 1351 .procname = "legacy_va_layout", 1352 .data = &sysctl_legacy_va_layout, 1353 .maxlen = sizeof(sysctl_legacy_va_layout), 1354 .mode = 0644, 1355 .proc_handler = proc_dointvec, 1356 .extra1 = &zero, 1357 }, 1358 #endif 1359 #ifdef CONFIG_NUMA 1360 { 1361 .procname = "zone_reclaim_mode", 1362 .data = &zone_reclaim_mode, 1363 .maxlen = sizeof(zone_reclaim_mode), 1364 .mode = 0644, 1365 .proc_handler = proc_dointvec, 1366 .extra1 = &zero, 1367 }, 1368 { 1369 .procname = "min_unmapped_ratio", 1370 .data = &sysctl_min_unmapped_ratio, 1371 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1372 .mode = 0644, 1373 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1374 .extra1 = &zero, 1375 .extra2 = &one_hundred, 1376 }, 1377 { 1378 .procname = "min_slab_ratio", 1379 .data = &sysctl_min_slab_ratio, 1380 .maxlen = sizeof(sysctl_min_slab_ratio), 1381 .mode = 0644, 1382 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1383 .extra1 = &zero, 1384 .extra2 = &one_hundred, 1385 }, 1386 #endif 1387 #ifdef CONFIG_SMP 1388 { 1389 .procname = "stat_interval", 1390 .data = &sysctl_stat_interval, 1391 .maxlen = sizeof(sysctl_stat_interval), 1392 .mode = 0644, 1393 .proc_handler = proc_dointvec_jiffies, 1394 }, 1395 #endif 1396 #ifdef CONFIG_MMU 1397 { 1398 .procname = "mmap_min_addr", 1399 .data = &dac_mmap_min_addr, 1400 .maxlen = sizeof(unsigned long), 1401 .mode = 0644, 1402 .proc_handler = mmap_min_addr_handler, 1403 }, 1404 #endif 1405 #ifdef CONFIG_NUMA 1406 { 1407 .procname = "numa_zonelist_order", 1408 .data = &numa_zonelist_order, 1409 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1410 .mode = 0644, 1411 .proc_handler = numa_zonelist_order_handler, 1412 }, 1413 #endif 1414 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1415 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1416 { 1417 .procname = "vdso_enabled", 1418 .data = &vdso_enabled, 1419 .maxlen = sizeof(vdso_enabled), 1420 .mode = 0644, 1421 .proc_handler = proc_dointvec, 1422 .extra1 = &zero, 1423 }, 1424 #endif 1425 #ifdef CONFIG_HIGHMEM 1426 { 1427 .procname = "highmem_is_dirtyable", 1428 .data = &vm_highmem_is_dirtyable, 1429 .maxlen = sizeof(vm_highmem_is_dirtyable), 1430 .mode = 0644, 1431 .proc_handler = proc_dointvec_minmax, 1432 .extra1 = &zero, 1433 .extra2 = &one, 1434 }, 1435 #endif 1436 { 1437 .procname = "scan_unevictable_pages", 1438 .data = &scan_unevictable_pages, 1439 .maxlen = sizeof(scan_unevictable_pages), 1440 .mode = 0644, 1441 .proc_handler = scan_unevictable_handler, 1442 }, 1443 #ifdef CONFIG_MEMORY_FAILURE 1444 { 1445 .procname = "memory_failure_early_kill", 1446 .data = &sysctl_memory_failure_early_kill, 1447 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1448 .mode = 0644, 1449 .proc_handler = proc_dointvec_minmax, 1450 .extra1 = &zero, 1451 .extra2 = &one, 1452 }, 1453 { 1454 .procname = "memory_failure_recovery", 1455 .data = &sysctl_memory_failure_recovery, 1456 .maxlen = sizeof(sysctl_memory_failure_recovery), 1457 .mode = 0644, 1458 .proc_handler = proc_dointvec_minmax, 1459 .extra1 = &zero, 1460 .extra2 = &one, 1461 }, 1462 #endif 1463 { 1464 .procname = "user_reserve_kbytes", 1465 .data = &sysctl_user_reserve_kbytes, 1466 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1467 .mode = 0644, 1468 .proc_handler = proc_doulongvec_minmax, 1469 }, 1470 { 1471 .procname = "admin_reserve_kbytes", 1472 .data = &sysctl_admin_reserve_kbytes, 1473 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1474 .mode = 0644, 1475 .proc_handler = proc_doulongvec_minmax, 1476 }, 1477 { } 1478 }; 1479 1480 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1481 static struct ctl_table binfmt_misc_table[] = { 1482 { } 1483 }; 1484 #endif 1485 1486 static struct ctl_table fs_table[] = { 1487 { 1488 .procname = "inode-nr", 1489 .data = &inodes_stat, 1490 .maxlen = 2*sizeof(long), 1491 .mode = 0444, 1492 .proc_handler = proc_nr_inodes, 1493 }, 1494 { 1495 .procname = "inode-state", 1496 .data = &inodes_stat, 1497 .maxlen = 7*sizeof(long), 1498 .mode = 0444, 1499 .proc_handler = proc_nr_inodes, 1500 }, 1501 { 1502 .procname = "file-nr", 1503 .data = &files_stat, 1504 .maxlen = sizeof(files_stat), 1505 .mode = 0444, 1506 .proc_handler = proc_nr_files, 1507 }, 1508 { 1509 .procname = "file-max", 1510 .data = &files_stat.max_files, 1511 .maxlen = sizeof(files_stat.max_files), 1512 .mode = 0644, 1513 .proc_handler = proc_doulongvec_minmax, 1514 }, 1515 { 1516 .procname = "nr_open", 1517 .data = &sysctl_nr_open, 1518 .maxlen = sizeof(int), 1519 .mode = 0644, 1520 .proc_handler = proc_dointvec_minmax, 1521 .extra1 = &sysctl_nr_open_min, 1522 .extra2 = &sysctl_nr_open_max, 1523 }, 1524 { 1525 .procname = "dentry-state", 1526 .data = &dentry_stat, 1527 .maxlen = 6*sizeof(long), 1528 .mode = 0444, 1529 .proc_handler = proc_nr_dentry, 1530 }, 1531 { 1532 .procname = "overflowuid", 1533 .data = &fs_overflowuid, 1534 .maxlen = sizeof(int), 1535 .mode = 0644, 1536 .proc_handler = proc_dointvec_minmax, 1537 .extra1 = &minolduid, 1538 .extra2 = &maxolduid, 1539 }, 1540 { 1541 .procname = "overflowgid", 1542 .data = &fs_overflowgid, 1543 .maxlen = sizeof(int), 1544 .mode = 0644, 1545 .proc_handler = proc_dointvec_minmax, 1546 .extra1 = &minolduid, 1547 .extra2 = &maxolduid, 1548 }, 1549 #ifdef CONFIG_FILE_LOCKING 1550 { 1551 .procname = "leases-enable", 1552 .data = &leases_enable, 1553 .maxlen = sizeof(int), 1554 .mode = 0644, 1555 .proc_handler = proc_dointvec, 1556 }, 1557 #endif 1558 #ifdef CONFIG_DNOTIFY 1559 { 1560 .procname = "dir-notify-enable", 1561 .data = &dir_notify_enable, 1562 .maxlen = sizeof(int), 1563 .mode = 0644, 1564 .proc_handler = proc_dointvec, 1565 }, 1566 #endif 1567 #ifdef CONFIG_MMU 1568 #ifdef CONFIG_FILE_LOCKING 1569 { 1570 .procname = "lease-break-time", 1571 .data = &lease_break_time, 1572 .maxlen = sizeof(int), 1573 .mode = 0644, 1574 .proc_handler = proc_dointvec, 1575 }, 1576 #endif 1577 #ifdef CONFIG_AIO 1578 { 1579 .procname = "aio-nr", 1580 .data = &aio_nr, 1581 .maxlen = sizeof(aio_nr), 1582 .mode = 0444, 1583 .proc_handler = proc_doulongvec_minmax, 1584 }, 1585 { 1586 .procname = "aio-max-nr", 1587 .data = &aio_max_nr, 1588 .maxlen = sizeof(aio_max_nr), 1589 .mode = 0644, 1590 .proc_handler = proc_doulongvec_minmax, 1591 }, 1592 #endif /* CONFIG_AIO */ 1593 #ifdef CONFIG_INOTIFY_USER 1594 { 1595 .procname = "inotify", 1596 .mode = 0555, 1597 .child = inotify_table, 1598 }, 1599 #endif 1600 #ifdef CONFIG_EPOLL 1601 { 1602 .procname = "epoll", 1603 .mode = 0555, 1604 .child = epoll_table, 1605 }, 1606 #endif 1607 #endif 1608 { 1609 .procname = "protected_symlinks", 1610 .data = &sysctl_protected_symlinks, 1611 .maxlen = sizeof(int), 1612 .mode = 0600, 1613 .proc_handler = proc_dointvec_minmax, 1614 .extra1 = &zero, 1615 .extra2 = &one, 1616 }, 1617 { 1618 .procname = "protected_hardlinks", 1619 .data = &sysctl_protected_hardlinks, 1620 .maxlen = sizeof(int), 1621 .mode = 0600, 1622 .proc_handler = proc_dointvec_minmax, 1623 .extra1 = &zero, 1624 .extra2 = &one, 1625 }, 1626 { 1627 .procname = "suid_dumpable", 1628 .data = &suid_dumpable, 1629 .maxlen = sizeof(int), 1630 .mode = 0644, 1631 .proc_handler = proc_dointvec_minmax_coredump, 1632 .extra1 = &zero, 1633 .extra2 = &two, 1634 }, 1635 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1636 { 1637 .procname = "binfmt_misc", 1638 .mode = 0555, 1639 .child = binfmt_misc_table, 1640 }, 1641 #endif 1642 { 1643 .procname = "pipe-max-size", 1644 .data = &pipe_max_size, 1645 .maxlen = sizeof(int), 1646 .mode = 0644, 1647 .proc_handler = &pipe_proc_fn, 1648 .extra1 = &pipe_min_size, 1649 }, 1650 { } 1651 }; 1652 1653 static struct ctl_table debug_table[] = { 1654 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1655 { 1656 .procname = "exception-trace", 1657 .data = &show_unhandled_signals, 1658 .maxlen = sizeof(int), 1659 .mode = 0644, 1660 .proc_handler = proc_dointvec 1661 }, 1662 #endif 1663 #if defined(CONFIG_OPTPROBES) 1664 { 1665 .procname = "kprobes-optimization", 1666 .data = &sysctl_kprobes_optimization, 1667 .maxlen = sizeof(int), 1668 .mode = 0644, 1669 .proc_handler = proc_kprobes_optimization_handler, 1670 .extra1 = &zero, 1671 .extra2 = &one, 1672 }, 1673 #endif 1674 { } 1675 }; 1676 1677 static struct ctl_table dev_table[] = { 1678 { } 1679 }; 1680 1681 int __init sysctl_init(void) 1682 { 1683 struct ctl_table_header *hdr; 1684 1685 hdr = register_sysctl_table(sysctl_base_table); 1686 kmemleak_not_leak(hdr); 1687 return 0; 1688 } 1689 1690 #endif /* CONFIG_SYSCTL */ 1691 1692 /* 1693 * /proc/sys support 1694 */ 1695 1696 #ifdef CONFIG_PROC_SYSCTL 1697 1698 static int _proc_do_string(void* data, int maxlen, int write, 1699 void __user *buffer, 1700 size_t *lenp, loff_t *ppos) 1701 { 1702 size_t len; 1703 char __user *p; 1704 char c; 1705 1706 if (!data || !maxlen || !*lenp) { 1707 *lenp = 0; 1708 return 0; 1709 } 1710 1711 if (write) { 1712 len = 0; 1713 p = buffer; 1714 while (len < *lenp) { 1715 if (get_user(c, p++)) 1716 return -EFAULT; 1717 if (c == 0 || c == '\n') 1718 break; 1719 len++; 1720 } 1721 if (len >= maxlen) 1722 len = maxlen-1; 1723 if(copy_from_user(data, buffer, len)) 1724 return -EFAULT; 1725 ((char *) data)[len] = 0; 1726 *ppos += *lenp; 1727 } else { 1728 len = strlen(data); 1729 if (len > maxlen) 1730 len = maxlen; 1731 1732 if (*ppos > len) { 1733 *lenp = 0; 1734 return 0; 1735 } 1736 1737 data += *ppos; 1738 len -= *ppos; 1739 1740 if (len > *lenp) 1741 len = *lenp; 1742 if (len) 1743 if(copy_to_user(buffer, data, len)) 1744 return -EFAULT; 1745 if (len < *lenp) { 1746 if(put_user('\n', ((char __user *) buffer) + len)) 1747 return -EFAULT; 1748 len++; 1749 } 1750 *lenp = len; 1751 *ppos += len; 1752 } 1753 return 0; 1754 } 1755 1756 /** 1757 * proc_dostring - read a string sysctl 1758 * @table: the sysctl table 1759 * @write: %TRUE if this is a write to the sysctl file 1760 * @buffer: the user buffer 1761 * @lenp: the size of the user buffer 1762 * @ppos: file position 1763 * 1764 * Reads/writes a string from/to the user buffer. If the kernel 1765 * buffer provided is not large enough to hold the string, the 1766 * string is truncated. The copied string is %NULL-terminated. 1767 * If the string is being read by the user process, it is copied 1768 * and a newline '\n' is added. It is truncated if the buffer is 1769 * not large enough. 1770 * 1771 * Returns 0 on success. 1772 */ 1773 int proc_dostring(struct ctl_table *table, int write, 1774 void __user *buffer, size_t *lenp, loff_t *ppos) 1775 { 1776 return _proc_do_string(table->data, table->maxlen, write, 1777 buffer, lenp, ppos); 1778 } 1779 1780 static size_t proc_skip_spaces(char **buf) 1781 { 1782 size_t ret; 1783 char *tmp = skip_spaces(*buf); 1784 ret = tmp - *buf; 1785 *buf = tmp; 1786 return ret; 1787 } 1788 1789 static void proc_skip_char(char **buf, size_t *size, const char v) 1790 { 1791 while (*size) { 1792 if (**buf != v) 1793 break; 1794 (*size)--; 1795 (*buf)++; 1796 } 1797 } 1798 1799 #define TMPBUFLEN 22 1800 /** 1801 * proc_get_long - reads an ASCII formatted integer from a user buffer 1802 * 1803 * @buf: a kernel buffer 1804 * @size: size of the kernel buffer 1805 * @val: this is where the number will be stored 1806 * @neg: set to %TRUE if number is negative 1807 * @perm_tr: a vector which contains the allowed trailers 1808 * @perm_tr_len: size of the perm_tr vector 1809 * @tr: pointer to store the trailer character 1810 * 1811 * In case of success %0 is returned and @buf and @size are updated with 1812 * the amount of bytes read. If @tr is non-NULL and a trailing 1813 * character exists (size is non-zero after returning from this 1814 * function), @tr is updated with the trailing character. 1815 */ 1816 static int proc_get_long(char **buf, size_t *size, 1817 unsigned long *val, bool *neg, 1818 const char *perm_tr, unsigned perm_tr_len, char *tr) 1819 { 1820 int len; 1821 char *p, tmp[TMPBUFLEN]; 1822 1823 if (!*size) 1824 return -EINVAL; 1825 1826 len = *size; 1827 if (len > TMPBUFLEN - 1) 1828 len = TMPBUFLEN - 1; 1829 1830 memcpy(tmp, *buf, len); 1831 1832 tmp[len] = 0; 1833 p = tmp; 1834 if (*p == '-' && *size > 1) { 1835 *neg = true; 1836 p++; 1837 } else 1838 *neg = false; 1839 if (!isdigit(*p)) 1840 return -EINVAL; 1841 1842 *val = simple_strtoul(p, &p, 0); 1843 1844 len = p - tmp; 1845 1846 /* We don't know if the next char is whitespace thus we may accept 1847 * invalid integers (e.g. 1234...a) or two integers instead of one 1848 * (e.g. 123...1). So lets not allow such large numbers. */ 1849 if (len == TMPBUFLEN - 1) 1850 return -EINVAL; 1851 1852 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1853 return -EINVAL; 1854 1855 if (tr && (len < *size)) 1856 *tr = *p; 1857 1858 *buf += len; 1859 *size -= len; 1860 1861 return 0; 1862 } 1863 1864 /** 1865 * proc_put_long - converts an integer to a decimal ASCII formatted string 1866 * 1867 * @buf: the user buffer 1868 * @size: the size of the user buffer 1869 * @val: the integer to be converted 1870 * @neg: sign of the number, %TRUE for negative 1871 * 1872 * In case of success %0 is returned and @buf and @size are updated with 1873 * the amount of bytes written. 1874 */ 1875 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1876 bool neg) 1877 { 1878 int len; 1879 char tmp[TMPBUFLEN], *p = tmp; 1880 1881 sprintf(p, "%s%lu", neg ? "-" : "", val); 1882 len = strlen(tmp); 1883 if (len > *size) 1884 len = *size; 1885 if (copy_to_user(*buf, tmp, len)) 1886 return -EFAULT; 1887 *size -= len; 1888 *buf += len; 1889 return 0; 1890 } 1891 #undef TMPBUFLEN 1892 1893 static int proc_put_char(void __user **buf, size_t *size, char c) 1894 { 1895 if (*size) { 1896 char __user **buffer = (char __user **)buf; 1897 if (put_user(c, *buffer)) 1898 return -EFAULT; 1899 (*size)--, (*buffer)++; 1900 *buf = *buffer; 1901 } 1902 return 0; 1903 } 1904 1905 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1906 int *valp, 1907 int write, void *data) 1908 { 1909 if (write) { 1910 *valp = *negp ? -*lvalp : *lvalp; 1911 } else { 1912 int val = *valp; 1913 if (val < 0) { 1914 *negp = true; 1915 *lvalp = (unsigned long)-val; 1916 } else { 1917 *negp = false; 1918 *lvalp = (unsigned long)val; 1919 } 1920 } 1921 return 0; 1922 } 1923 1924 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1925 1926 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1927 int write, void __user *buffer, 1928 size_t *lenp, loff_t *ppos, 1929 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1930 int write, void *data), 1931 void *data) 1932 { 1933 int *i, vleft, first = 1, err = 0; 1934 unsigned long page = 0; 1935 size_t left; 1936 char *kbuf; 1937 1938 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1939 *lenp = 0; 1940 return 0; 1941 } 1942 1943 i = (int *) tbl_data; 1944 vleft = table->maxlen / sizeof(*i); 1945 left = *lenp; 1946 1947 if (!conv) 1948 conv = do_proc_dointvec_conv; 1949 1950 if (write) { 1951 if (left > PAGE_SIZE - 1) 1952 left = PAGE_SIZE - 1; 1953 page = __get_free_page(GFP_TEMPORARY); 1954 kbuf = (char *) page; 1955 if (!kbuf) 1956 return -ENOMEM; 1957 if (copy_from_user(kbuf, buffer, left)) { 1958 err = -EFAULT; 1959 goto free; 1960 } 1961 kbuf[left] = 0; 1962 } 1963 1964 for (; left && vleft--; i++, first=0) { 1965 unsigned long lval; 1966 bool neg; 1967 1968 if (write) { 1969 left -= proc_skip_spaces(&kbuf); 1970 1971 if (!left) 1972 break; 1973 err = proc_get_long(&kbuf, &left, &lval, &neg, 1974 proc_wspace_sep, 1975 sizeof(proc_wspace_sep), NULL); 1976 if (err) 1977 break; 1978 if (conv(&neg, &lval, i, 1, data)) { 1979 err = -EINVAL; 1980 break; 1981 } 1982 } else { 1983 if (conv(&neg, &lval, i, 0, data)) { 1984 err = -EINVAL; 1985 break; 1986 } 1987 if (!first) 1988 err = proc_put_char(&buffer, &left, '\t'); 1989 if (err) 1990 break; 1991 err = proc_put_long(&buffer, &left, lval, neg); 1992 if (err) 1993 break; 1994 } 1995 } 1996 1997 if (!write && !first && left && !err) 1998 err = proc_put_char(&buffer, &left, '\n'); 1999 if (write && !err && left) 2000 left -= proc_skip_spaces(&kbuf); 2001 free: 2002 if (write) { 2003 free_page(page); 2004 if (first) 2005 return err ? : -EINVAL; 2006 } 2007 *lenp -= left; 2008 *ppos += *lenp; 2009 return err; 2010 } 2011 2012 static int do_proc_dointvec(struct ctl_table *table, int write, 2013 void __user *buffer, size_t *lenp, loff_t *ppos, 2014 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2015 int write, void *data), 2016 void *data) 2017 { 2018 return __do_proc_dointvec(table->data, table, write, 2019 buffer, lenp, ppos, conv, data); 2020 } 2021 2022 /** 2023 * proc_dointvec - read a vector of integers 2024 * @table: the sysctl table 2025 * @write: %TRUE if this is a write to the sysctl file 2026 * @buffer: the user buffer 2027 * @lenp: the size of the user buffer 2028 * @ppos: file position 2029 * 2030 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2031 * values from/to the user buffer, treated as an ASCII string. 2032 * 2033 * Returns 0 on success. 2034 */ 2035 int proc_dointvec(struct ctl_table *table, int write, 2036 void __user *buffer, size_t *lenp, loff_t *ppos) 2037 { 2038 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2039 NULL,NULL); 2040 } 2041 2042 /* 2043 * Taint values can only be increased 2044 * This means we can safely use a temporary. 2045 */ 2046 static int proc_taint(struct ctl_table *table, int write, 2047 void __user *buffer, size_t *lenp, loff_t *ppos) 2048 { 2049 struct ctl_table t; 2050 unsigned long tmptaint = get_taint(); 2051 int err; 2052 2053 if (write && !capable(CAP_SYS_ADMIN)) 2054 return -EPERM; 2055 2056 t = *table; 2057 t.data = &tmptaint; 2058 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2059 if (err < 0) 2060 return err; 2061 2062 if (write) { 2063 /* 2064 * Poor man's atomic or. Not worth adding a primitive 2065 * to everyone's atomic.h for this 2066 */ 2067 int i; 2068 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2069 if ((tmptaint >> i) & 1) 2070 add_taint(i, LOCKDEP_STILL_OK); 2071 } 2072 } 2073 2074 return err; 2075 } 2076 2077 #ifdef CONFIG_PRINTK 2078 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2079 void __user *buffer, size_t *lenp, loff_t *ppos) 2080 { 2081 if (write && !capable(CAP_SYS_ADMIN)) 2082 return -EPERM; 2083 2084 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2085 } 2086 #endif 2087 2088 struct do_proc_dointvec_minmax_conv_param { 2089 int *min; 2090 int *max; 2091 }; 2092 2093 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2094 int *valp, 2095 int write, void *data) 2096 { 2097 struct do_proc_dointvec_minmax_conv_param *param = data; 2098 if (write) { 2099 int val = *negp ? -*lvalp : *lvalp; 2100 if ((param->min && *param->min > val) || 2101 (param->max && *param->max < val)) 2102 return -EINVAL; 2103 *valp = val; 2104 } else { 2105 int val = *valp; 2106 if (val < 0) { 2107 *negp = true; 2108 *lvalp = (unsigned long)-val; 2109 } else { 2110 *negp = false; 2111 *lvalp = (unsigned long)val; 2112 } 2113 } 2114 return 0; 2115 } 2116 2117 /** 2118 * proc_dointvec_minmax - read a vector of integers with min/max values 2119 * @table: the sysctl table 2120 * @write: %TRUE if this is a write to the sysctl file 2121 * @buffer: the user buffer 2122 * @lenp: the size of the user buffer 2123 * @ppos: file position 2124 * 2125 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2126 * values from/to the user buffer, treated as an ASCII string. 2127 * 2128 * This routine will ensure the values are within the range specified by 2129 * table->extra1 (min) and table->extra2 (max). 2130 * 2131 * Returns 0 on success. 2132 */ 2133 int proc_dointvec_minmax(struct ctl_table *table, int write, 2134 void __user *buffer, size_t *lenp, loff_t *ppos) 2135 { 2136 struct do_proc_dointvec_minmax_conv_param param = { 2137 .min = (int *) table->extra1, 2138 .max = (int *) table->extra2, 2139 }; 2140 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2141 do_proc_dointvec_minmax_conv, ¶m); 2142 } 2143 2144 static void validate_coredump_safety(void) 2145 { 2146 #ifdef CONFIG_COREDUMP 2147 if (suid_dumpable == SUID_DUMP_ROOT && 2148 core_pattern[0] != '/' && core_pattern[0] != '|') { 2149 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2150 "suid_dumpable=2. Pipe handler or fully qualified "\ 2151 "core dump path required.\n"); 2152 } 2153 #endif 2154 } 2155 2156 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2157 void __user *buffer, size_t *lenp, loff_t *ppos) 2158 { 2159 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2160 if (!error) 2161 validate_coredump_safety(); 2162 return error; 2163 } 2164 2165 #ifdef CONFIG_COREDUMP 2166 static int proc_dostring_coredump(struct ctl_table *table, int write, 2167 void __user *buffer, size_t *lenp, loff_t *ppos) 2168 { 2169 int error = proc_dostring(table, write, buffer, lenp, ppos); 2170 if (!error) 2171 validate_coredump_safety(); 2172 return error; 2173 } 2174 #endif 2175 2176 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2177 void __user *buffer, 2178 size_t *lenp, loff_t *ppos, 2179 unsigned long convmul, 2180 unsigned long convdiv) 2181 { 2182 unsigned long *i, *min, *max; 2183 int vleft, first = 1, err = 0; 2184 unsigned long page = 0; 2185 size_t left; 2186 char *kbuf; 2187 2188 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2189 *lenp = 0; 2190 return 0; 2191 } 2192 2193 i = (unsigned long *) data; 2194 min = (unsigned long *) table->extra1; 2195 max = (unsigned long *) table->extra2; 2196 vleft = table->maxlen / sizeof(unsigned long); 2197 left = *lenp; 2198 2199 if (write) { 2200 if (left > PAGE_SIZE - 1) 2201 left = PAGE_SIZE - 1; 2202 page = __get_free_page(GFP_TEMPORARY); 2203 kbuf = (char *) page; 2204 if (!kbuf) 2205 return -ENOMEM; 2206 if (copy_from_user(kbuf, buffer, left)) { 2207 err = -EFAULT; 2208 goto free; 2209 } 2210 kbuf[left] = 0; 2211 } 2212 2213 for (; left && vleft--; i++, first = 0) { 2214 unsigned long val; 2215 2216 if (write) { 2217 bool neg; 2218 2219 left -= proc_skip_spaces(&kbuf); 2220 2221 err = proc_get_long(&kbuf, &left, &val, &neg, 2222 proc_wspace_sep, 2223 sizeof(proc_wspace_sep), NULL); 2224 if (err) 2225 break; 2226 if (neg) 2227 continue; 2228 if ((min && val < *min) || (max && val > *max)) 2229 continue; 2230 *i = val; 2231 } else { 2232 val = convdiv * (*i) / convmul; 2233 if (!first) { 2234 err = proc_put_char(&buffer, &left, '\t'); 2235 if (err) 2236 break; 2237 } 2238 err = proc_put_long(&buffer, &left, val, false); 2239 if (err) 2240 break; 2241 } 2242 } 2243 2244 if (!write && !first && left && !err) 2245 err = proc_put_char(&buffer, &left, '\n'); 2246 if (write && !err) 2247 left -= proc_skip_spaces(&kbuf); 2248 free: 2249 if (write) { 2250 free_page(page); 2251 if (first) 2252 return err ? : -EINVAL; 2253 } 2254 *lenp -= left; 2255 *ppos += *lenp; 2256 return err; 2257 } 2258 2259 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2260 void __user *buffer, 2261 size_t *lenp, loff_t *ppos, 2262 unsigned long convmul, 2263 unsigned long convdiv) 2264 { 2265 return __do_proc_doulongvec_minmax(table->data, table, write, 2266 buffer, lenp, ppos, convmul, convdiv); 2267 } 2268 2269 /** 2270 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2271 * @table: the sysctl table 2272 * @write: %TRUE if this is a write to the sysctl file 2273 * @buffer: the user buffer 2274 * @lenp: the size of the user buffer 2275 * @ppos: file position 2276 * 2277 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2278 * values from/to the user buffer, treated as an ASCII string. 2279 * 2280 * This routine will ensure the values are within the range specified by 2281 * table->extra1 (min) and table->extra2 (max). 2282 * 2283 * Returns 0 on success. 2284 */ 2285 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2286 void __user *buffer, size_t *lenp, loff_t *ppos) 2287 { 2288 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2289 } 2290 2291 /** 2292 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2293 * @table: the sysctl table 2294 * @write: %TRUE if this is a write to the sysctl file 2295 * @buffer: the user buffer 2296 * @lenp: the size of the user buffer 2297 * @ppos: file position 2298 * 2299 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2300 * values from/to the user buffer, treated as an ASCII string. The values 2301 * are treated as milliseconds, and converted to jiffies when they are stored. 2302 * 2303 * This routine will ensure the values are within the range specified by 2304 * table->extra1 (min) and table->extra2 (max). 2305 * 2306 * Returns 0 on success. 2307 */ 2308 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2309 void __user *buffer, 2310 size_t *lenp, loff_t *ppos) 2311 { 2312 return do_proc_doulongvec_minmax(table, write, buffer, 2313 lenp, ppos, HZ, 1000l); 2314 } 2315 2316 2317 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2318 int *valp, 2319 int write, void *data) 2320 { 2321 if (write) { 2322 if (*lvalp > LONG_MAX / HZ) 2323 return 1; 2324 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2325 } else { 2326 int val = *valp; 2327 unsigned long lval; 2328 if (val < 0) { 2329 *negp = true; 2330 lval = (unsigned long)-val; 2331 } else { 2332 *negp = false; 2333 lval = (unsigned long)val; 2334 } 2335 *lvalp = lval / HZ; 2336 } 2337 return 0; 2338 } 2339 2340 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2341 int *valp, 2342 int write, void *data) 2343 { 2344 if (write) { 2345 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2346 return 1; 2347 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2348 } else { 2349 int val = *valp; 2350 unsigned long lval; 2351 if (val < 0) { 2352 *negp = true; 2353 lval = (unsigned long)-val; 2354 } else { 2355 *negp = false; 2356 lval = (unsigned long)val; 2357 } 2358 *lvalp = jiffies_to_clock_t(lval); 2359 } 2360 return 0; 2361 } 2362 2363 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2364 int *valp, 2365 int write, void *data) 2366 { 2367 if (write) { 2368 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2369 2370 if (jif > INT_MAX) 2371 return 1; 2372 *valp = (int)jif; 2373 } else { 2374 int val = *valp; 2375 unsigned long lval; 2376 if (val < 0) { 2377 *negp = true; 2378 lval = (unsigned long)-val; 2379 } else { 2380 *negp = false; 2381 lval = (unsigned long)val; 2382 } 2383 *lvalp = jiffies_to_msecs(lval); 2384 } 2385 return 0; 2386 } 2387 2388 /** 2389 * proc_dointvec_jiffies - read a vector of integers as seconds 2390 * @table: the sysctl table 2391 * @write: %TRUE if this is a write to the sysctl file 2392 * @buffer: the user buffer 2393 * @lenp: the size of the user buffer 2394 * @ppos: file position 2395 * 2396 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2397 * values from/to the user buffer, treated as an ASCII string. 2398 * The values read are assumed to be in seconds, and are converted into 2399 * jiffies. 2400 * 2401 * Returns 0 on success. 2402 */ 2403 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2404 void __user *buffer, size_t *lenp, loff_t *ppos) 2405 { 2406 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2407 do_proc_dointvec_jiffies_conv,NULL); 2408 } 2409 2410 /** 2411 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2412 * @table: the sysctl table 2413 * @write: %TRUE if this is a write to the sysctl file 2414 * @buffer: the user buffer 2415 * @lenp: the size of the user buffer 2416 * @ppos: pointer to the file position 2417 * 2418 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2419 * values from/to the user buffer, treated as an ASCII string. 2420 * The values read are assumed to be in 1/USER_HZ seconds, and 2421 * are converted into jiffies. 2422 * 2423 * Returns 0 on success. 2424 */ 2425 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2426 void __user *buffer, size_t *lenp, loff_t *ppos) 2427 { 2428 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2429 do_proc_dointvec_userhz_jiffies_conv,NULL); 2430 } 2431 2432 /** 2433 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2434 * @table: the sysctl table 2435 * @write: %TRUE if this is a write to the sysctl file 2436 * @buffer: the user buffer 2437 * @lenp: the size of the user buffer 2438 * @ppos: file position 2439 * @ppos: the current position in the file 2440 * 2441 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2442 * values from/to the user buffer, treated as an ASCII string. 2443 * The values read are assumed to be in 1/1000 seconds, and 2444 * are converted into jiffies. 2445 * 2446 * Returns 0 on success. 2447 */ 2448 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2449 void __user *buffer, size_t *lenp, loff_t *ppos) 2450 { 2451 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2452 do_proc_dointvec_ms_jiffies_conv, NULL); 2453 } 2454 2455 static int proc_do_cad_pid(struct ctl_table *table, int write, 2456 void __user *buffer, size_t *lenp, loff_t *ppos) 2457 { 2458 struct pid *new_pid; 2459 pid_t tmp; 2460 int r; 2461 2462 tmp = pid_vnr(cad_pid); 2463 2464 r = __do_proc_dointvec(&tmp, table, write, buffer, 2465 lenp, ppos, NULL, NULL); 2466 if (r || !write) 2467 return r; 2468 2469 new_pid = find_get_pid(tmp); 2470 if (!new_pid) 2471 return -ESRCH; 2472 2473 put_pid(xchg(&cad_pid, new_pid)); 2474 return 0; 2475 } 2476 2477 /** 2478 * proc_do_large_bitmap - read/write from/to a large bitmap 2479 * @table: the sysctl table 2480 * @write: %TRUE if this is a write to the sysctl file 2481 * @buffer: the user buffer 2482 * @lenp: the size of the user buffer 2483 * @ppos: file position 2484 * 2485 * The bitmap is stored at table->data and the bitmap length (in bits) 2486 * in table->maxlen. 2487 * 2488 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2489 * large bitmaps may be represented in a compact manner. Writing into 2490 * the file will clear the bitmap then update it with the given input. 2491 * 2492 * Returns 0 on success. 2493 */ 2494 int proc_do_large_bitmap(struct ctl_table *table, int write, 2495 void __user *buffer, size_t *lenp, loff_t *ppos) 2496 { 2497 int err = 0; 2498 bool first = 1; 2499 size_t left = *lenp; 2500 unsigned long bitmap_len = table->maxlen; 2501 unsigned long *bitmap = (unsigned long *) table->data; 2502 unsigned long *tmp_bitmap = NULL; 2503 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2504 2505 if (!bitmap_len || !left || (*ppos && !write)) { 2506 *lenp = 0; 2507 return 0; 2508 } 2509 2510 if (write) { 2511 unsigned long page = 0; 2512 char *kbuf; 2513 2514 if (left > PAGE_SIZE - 1) 2515 left = PAGE_SIZE - 1; 2516 2517 page = __get_free_page(GFP_TEMPORARY); 2518 kbuf = (char *) page; 2519 if (!kbuf) 2520 return -ENOMEM; 2521 if (copy_from_user(kbuf, buffer, left)) { 2522 free_page(page); 2523 return -EFAULT; 2524 } 2525 kbuf[left] = 0; 2526 2527 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2528 GFP_KERNEL); 2529 if (!tmp_bitmap) { 2530 free_page(page); 2531 return -ENOMEM; 2532 } 2533 proc_skip_char(&kbuf, &left, '\n'); 2534 while (!err && left) { 2535 unsigned long val_a, val_b; 2536 bool neg; 2537 2538 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2539 sizeof(tr_a), &c); 2540 if (err) 2541 break; 2542 if (val_a >= bitmap_len || neg) { 2543 err = -EINVAL; 2544 break; 2545 } 2546 2547 val_b = val_a; 2548 if (left) { 2549 kbuf++; 2550 left--; 2551 } 2552 2553 if (c == '-') { 2554 err = proc_get_long(&kbuf, &left, &val_b, 2555 &neg, tr_b, sizeof(tr_b), 2556 &c); 2557 if (err) 2558 break; 2559 if (val_b >= bitmap_len || neg || 2560 val_a > val_b) { 2561 err = -EINVAL; 2562 break; 2563 } 2564 if (left) { 2565 kbuf++; 2566 left--; 2567 } 2568 } 2569 2570 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2571 first = 0; 2572 proc_skip_char(&kbuf, &left, '\n'); 2573 } 2574 free_page(page); 2575 } else { 2576 unsigned long bit_a, bit_b = 0; 2577 2578 while (left) { 2579 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2580 if (bit_a >= bitmap_len) 2581 break; 2582 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2583 bit_a + 1) - 1; 2584 2585 if (!first) { 2586 err = proc_put_char(&buffer, &left, ','); 2587 if (err) 2588 break; 2589 } 2590 err = proc_put_long(&buffer, &left, bit_a, false); 2591 if (err) 2592 break; 2593 if (bit_a != bit_b) { 2594 err = proc_put_char(&buffer, &left, '-'); 2595 if (err) 2596 break; 2597 err = proc_put_long(&buffer, &left, bit_b, false); 2598 if (err) 2599 break; 2600 } 2601 2602 first = 0; bit_b++; 2603 } 2604 if (!err) 2605 err = proc_put_char(&buffer, &left, '\n'); 2606 } 2607 2608 if (!err) { 2609 if (write) { 2610 if (*ppos) 2611 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2612 else 2613 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2614 } 2615 kfree(tmp_bitmap); 2616 *lenp -= left; 2617 *ppos += *lenp; 2618 return 0; 2619 } else { 2620 kfree(tmp_bitmap); 2621 return err; 2622 } 2623 } 2624 2625 #else /* CONFIG_PROC_SYSCTL */ 2626 2627 int proc_dostring(struct ctl_table *table, int write, 2628 void __user *buffer, size_t *lenp, loff_t *ppos) 2629 { 2630 return -ENOSYS; 2631 } 2632 2633 int proc_dointvec(struct ctl_table *table, int write, 2634 void __user *buffer, size_t *lenp, loff_t *ppos) 2635 { 2636 return -ENOSYS; 2637 } 2638 2639 int proc_dointvec_minmax(struct ctl_table *table, int write, 2640 void __user *buffer, size_t *lenp, loff_t *ppos) 2641 { 2642 return -ENOSYS; 2643 } 2644 2645 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2646 void __user *buffer, size_t *lenp, loff_t *ppos) 2647 { 2648 return -ENOSYS; 2649 } 2650 2651 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2652 void __user *buffer, size_t *lenp, loff_t *ppos) 2653 { 2654 return -ENOSYS; 2655 } 2656 2657 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2658 void __user *buffer, size_t *lenp, loff_t *ppos) 2659 { 2660 return -ENOSYS; 2661 } 2662 2663 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2664 void __user *buffer, size_t *lenp, loff_t *ppos) 2665 { 2666 return -ENOSYS; 2667 } 2668 2669 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2670 void __user *buffer, 2671 size_t *lenp, loff_t *ppos) 2672 { 2673 return -ENOSYS; 2674 } 2675 2676 2677 #endif /* CONFIG_PROC_SYSCTL */ 2678 2679 /* 2680 * No sense putting this after each symbol definition, twice, 2681 * exception granted :-) 2682 */ 2683 EXPORT_SYMBOL(proc_dointvec); 2684 EXPORT_SYMBOL(proc_dointvec_jiffies); 2685 EXPORT_SYMBOL(proc_dointvec_minmax); 2686 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2687 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2688 EXPORT_SYMBOL(proc_dostring); 2689 EXPORT_SYMBOL(proc_doulongvec_minmax); 2690 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2691