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/aio.h> 23 #include <linux/mm.h> 24 #include <linux/swap.h> 25 #include <linux/slab.h> 26 #include <linux/sysctl.h> 27 #include <linux/bitmap.h> 28 #include <linux/signal.h> 29 #include <linux/printk.h> 30 #include <linux/proc_fs.h> 31 #include <linux/security.h> 32 #include <linux/ctype.h> 33 #include <linux/kmemcheck.h> 34 #include <linux/kmemleak.h> 35 #include <linux/fs.h> 36 #include <linux/init.h> 37 #include <linux/kernel.h> 38 #include <linux/kobject.h> 39 #include <linux/net.h> 40 #include <linux/sysrq.h> 41 #include <linux/highuid.h> 42 #include <linux/writeback.h> 43 #include <linux/ratelimit.h> 44 #include <linux/compaction.h> 45 #include <linux/hugetlb.h> 46 #include <linux/initrd.h> 47 #include <linux/key.h> 48 #include <linux/times.h> 49 #include <linux/limits.h> 50 #include <linux/dcache.h> 51 #include <linux/dnotify.h> 52 #include <linux/syscalls.h> 53 #include <linux/vmstat.h> 54 #include <linux/nfs_fs.h> 55 #include <linux/acpi.h> 56 #include <linux/reboot.h> 57 #include <linux/ftrace.h> 58 #include <linux/perf_event.h> 59 #include <linux/kprobes.h> 60 #include <linux/pipe_fs_i.h> 61 #include <linux/oom.h> 62 #include <linux/kmod.h> 63 #include <linux/capability.h> 64 #include <linux/binfmts.h> 65 #include <linux/sched/sysctl.h> 66 #include <linux/kexec.h> 67 #include <linux/bpf.h> 68 #include <linux/mount.h> 69 70 #include <asm/uaccess.h> 71 #include <asm/processor.h> 72 73 #ifdef CONFIG_X86 74 #include <asm/nmi.h> 75 #include <asm/stacktrace.h> 76 #include <asm/io.h> 77 #endif 78 #ifdef CONFIG_SPARC 79 #include <asm/setup.h> 80 #endif 81 #ifdef CONFIG_BSD_PROCESS_ACCT 82 #include <linux/acct.h> 83 #endif 84 #ifdef CONFIG_RT_MUTEXES 85 #include <linux/rtmutex.h> 86 #endif 87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 88 #include <linux/lockdep.h> 89 #endif 90 #ifdef CONFIG_CHR_DEV_SG 91 #include <scsi/sg.h> 92 #endif 93 94 #ifdef CONFIG_LOCKUP_DETECTOR 95 #include <linux/nmi.h> 96 #endif 97 98 #if defined(CONFIG_SYSCTL) 99 100 /* External variables not in a header file. */ 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 percpu_pagelist_fraction; 110 extern int latencytop_enabled; 111 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; 112 #ifndef CONFIG_MMU 113 extern int sysctl_nr_trim_pages; 114 #endif 115 116 /* Constants used for minimum and maximum */ 117 #ifdef CONFIG_LOCKUP_DETECTOR 118 static int sixty = 60; 119 #endif 120 121 static int __maybe_unused neg_one = -1; 122 123 static int zero; 124 static int __maybe_unused one = 1; 125 static int __maybe_unused two = 2; 126 static int __maybe_unused four = 4; 127 static unsigned long one_ul = 1; 128 static int one_hundred = 100; 129 static int one_thousand = 1000; 130 #ifdef CONFIG_PRINTK 131 static int ten_thousand = 10000; 132 #endif 133 #ifdef CONFIG_PERF_EVENTS 134 static int six_hundred_forty_kb = 640 * 1024; 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; 143 144 static int ngroups_max = NGROUPS_MAX; 145 static const int cap_last_cap = CAP_LAST_CAP; 146 147 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ 148 #ifdef CONFIG_DETECT_HUNG_TASK 149 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 150 #endif 151 152 #ifdef CONFIG_INOTIFY_USER 153 #include <linux/inotify.h> 154 #endif 155 #ifdef CONFIG_SPARC 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 175 176 #define SYSCTL_WRITES_LEGACY -1 177 #define SYSCTL_WRITES_WARN 0 178 #define SYSCTL_WRITES_STRICT 1 179 180 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT; 181 182 static int proc_do_cad_pid(struct ctl_table *table, int write, 183 void __user *buffer, size_t *lenp, loff_t *ppos); 184 static int proc_taint(struct ctl_table *table, int write, 185 void __user *buffer, size_t *lenp, loff_t *ppos); 186 #endif 187 188 #ifdef CONFIG_PRINTK 189 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 190 void __user *buffer, size_t *lenp, loff_t *ppos); 191 #endif 192 193 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 194 void __user *buffer, size_t *lenp, loff_t *ppos); 195 #ifdef CONFIG_COREDUMP 196 static int proc_dostring_coredump(struct ctl_table *table, int write, 197 void __user *buffer, size_t *lenp, loff_t *ppos); 198 #endif 199 200 #ifdef CONFIG_MAGIC_SYSRQ 201 /* Note: sysrq code uses it's own private copy */ 202 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 203 204 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 205 void __user *buffer, size_t *lenp, 206 loff_t *ppos) 207 { 208 int error; 209 210 error = proc_dointvec(table, write, buffer, lenp, ppos); 211 if (error) 212 return error; 213 214 if (write) 215 sysrq_toggle_support(__sysrq_enabled); 216 217 return 0; 218 } 219 220 #endif 221 222 static struct ctl_table kern_table[]; 223 static struct ctl_table vm_table[]; 224 static struct ctl_table fs_table[]; 225 static struct ctl_table debug_table[]; 226 static struct ctl_table dev_table[]; 227 extern struct ctl_table random_table[]; 228 #ifdef CONFIG_EPOLL 229 extern struct ctl_table epoll_table[]; 230 #endif 231 232 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 233 int sysctl_legacy_va_layout; 234 #endif 235 236 /* The default sysctl tables: */ 237 238 static struct ctl_table sysctl_base_table[] = { 239 { 240 .procname = "kernel", 241 .mode = 0555, 242 .child = kern_table, 243 }, 244 { 245 .procname = "vm", 246 .mode = 0555, 247 .child = vm_table, 248 }, 249 { 250 .procname = "fs", 251 .mode = 0555, 252 .child = fs_table, 253 }, 254 { 255 .procname = "debug", 256 .mode = 0555, 257 .child = debug_table, 258 }, 259 { 260 .procname = "dev", 261 .mode = 0555, 262 .child = dev_table, 263 }, 264 { } 265 }; 266 267 #ifdef CONFIG_SCHED_DEBUG 268 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 269 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 270 static int min_wakeup_granularity_ns; /* 0 usecs */ 271 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 272 #ifdef CONFIG_SMP 273 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 274 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 275 #endif /* CONFIG_SMP */ 276 #endif /* CONFIG_SCHED_DEBUG */ 277 278 #ifdef CONFIG_COMPACTION 279 static int min_extfrag_threshold; 280 static int max_extfrag_threshold = 1000; 281 #endif 282 283 static struct ctl_table kern_table[] = { 284 { 285 .procname = "sched_child_runs_first", 286 .data = &sysctl_sched_child_runs_first, 287 .maxlen = sizeof(unsigned int), 288 .mode = 0644, 289 .proc_handler = proc_dointvec, 290 }, 291 #ifdef CONFIG_SCHED_DEBUG 292 { 293 .procname = "sched_min_granularity_ns", 294 .data = &sysctl_sched_min_granularity, 295 .maxlen = sizeof(unsigned int), 296 .mode = 0644, 297 .proc_handler = sched_proc_update_handler, 298 .extra1 = &min_sched_granularity_ns, 299 .extra2 = &max_sched_granularity_ns, 300 }, 301 { 302 .procname = "sched_latency_ns", 303 .data = &sysctl_sched_latency, 304 .maxlen = sizeof(unsigned int), 305 .mode = 0644, 306 .proc_handler = sched_proc_update_handler, 307 .extra1 = &min_sched_granularity_ns, 308 .extra2 = &max_sched_granularity_ns, 309 }, 310 { 311 .procname = "sched_wakeup_granularity_ns", 312 .data = &sysctl_sched_wakeup_granularity, 313 .maxlen = sizeof(unsigned int), 314 .mode = 0644, 315 .proc_handler = sched_proc_update_handler, 316 .extra1 = &min_wakeup_granularity_ns, 317 .extra2 = &max_wakeup_granularity_ns, 318 }, 319 #ifdef CONFIG_SMP 320 { 321 .procname = "sched_tunable_scaling", 322 .data = &sysctl_sched_tunable_scaling, 323 .maxlen = sizeof(enum sched_tunable_scaling), 324 .mode = 0644, 325 .proc_handler = sched_proc_update_handler, 326 .extra1 = &min_sched_tunable_scaling, 327 .extra2 = &max_sched_tunable_scaling, 328 }, 329 { 330 .procname = "sched_migration_cost_ns", 331 .data = &sysctl_sched_migration_cost, 332 .maxlen = sizeof(unsigned int), 333 .mode = 0644, 334 .proc_handler = proc_dointvec, 335 }, 336 { 337 .procname = "sched_nr_migrate", 338 .data = &sysctl_sched_nr_migrate, 339 .maxlen = sizeof(unsigned int), 340 .mode = 0644, 341 .proc_handler = proc_dointvec, 342 }, 343 { 344 .procname = "sched_time_avg_ms", 345 .data = &sysctl_sched_time_avg, 346 .maxlen = sizeof(unsigned int), 347 .mode = 0644, 348 .proc_handler = proc_dointvec, 349 }, 350 { 351 .procname = "sched_shares_window_ns", 352 .data = &sysctl_sched_shares_window, 353 .maxlen = sizeof(unsigned int), 354 .mode = 0644, 355 .proc_handler = proc_dointvec, 356 }, 357 #ifdef CONFIG_SCHEDSTATS 358 { 359 .procname = "sched_schedstats", 360 .data = NULL, 361 .maxlen = sizeof(unsigned int), 362 .mode = 0644, 363 .proc_handler = sysctl_schedstats, 364 .extra1 = &zero, 365 .extra2 = &one, 366 }, 367 #endif /* CONFIG_SCHEDSTATS */ 368 #endif /* CONFIG_SMP */ 369 #ifdef CONFIG_NUMA_BALANCING 370 { 371 .procname = "numa_balancing_scan_delay_ms", 372 .data = &sysctl_numa_balancing_scan_delay, 373 .maxlen = sizeof(unsigned int), 374 .mode = 0644, 375 .proc_handler = proc_dointvec, 376 }, 377 { 378 .procname = "numa_balancing_scan_period_min_ms", 379 .data = &sysctl_numa_balancing_scan_period_min, 380 .maxlen = sizeof(unsigned int), 381 .mode = 0644, 382 .proc_handler = proc_dointvec, 383 }, 384 { 385 .procname = "numa_balancing_scan_period_max_ms", 386 .data = &sysctl_numa_balancing_scan_period_max, 387 .maxlen = sizeof(unsigned int), 388 .mode = 0644, 389 .proc_handler = proc_dointvec, 390 }, 391 { 392 .procname = "numa_balancing_scan_size_mb", 393 .data = &sysctl_numa_balancing_scan_size, 394 .maxlen = sizeof(unsigned int), 395 .mode = 0644, 396 .proc_handler = proc_dointvec_minmax, 397 .extra1 = &one, 398 }, 399 { 400 .procname = "numa_balancing", 401 .data = NULL, /* filled in by handler */ 402 .maxlen = sizeof(unsigned int), 403 .mode = 0644, 404 .proc_handler = sysctl_numa_balancing, 405 .extra1 = &zero, 406 .extra2 = &one, 407 }, 408 #endif /* CONFIG_NUMA_BALANCING */ 409 #endif /* CONFIG_SCHED_DEBUG */ 410 { 411 .procname = "sched_rt_period_us", 412 .data = &sysctl_sched_rt_period, 413 .maxlen = sizeof(unsigned int), 414 .mode = 0644, 415 .proc_handler = sched_rt_handler, 416 }, 417 { 418 .procname = "sched_rt_runtime_us", 419 .data = &sysctl_sched_rt_runtime, 420 .maxlen = sizeof(int), 421 .mode = 0644, 422 .proc_handler = sched_rt_handler, 423 }, 424 { 425 .procname = "sched_rr_timeslice_ms", 426 .data = &sched_rr_timeslice, 427 .maxlen = sizeof(int), 428 .mode = 0644, 429 .proc_handler = sched_rr_handler, 430 }, 431 #ifdef CONFIG_SCHED_AUTOGROUP 432 { 433 .procname = "sched_autogroup_enabled", 434 .data = &sysctl_sched_autogroup_enabled, 435 .maxlen = sizeof(unsigned int), 436 .mode = 0644, 437 .proc_handler = proc_dointvec_minmax, 438 .extra1 = &zero, 439 .extra2 = &one, 440 }, 441 #endif 442 #ifdef CONFIG_CFS_BANDWIDTH 443 { 444 .procname = "sched_cfs_bandwidth_slice_us", 445 .data = &sysctl_sched_cfs_bandwidth_slice, 446 .maxlen = sizeof(unsigned int), 447 .mode = 0644, 448 .proc_handler = proc_dointvec_minmax, 449 .extra1 = &one, 450 }, 451 #endif 452 #ifdef CONFIG_PROVE_LOCKING 453 { 454 .procname = "prove_locking", 455 .data = &prove_locking, 456 .maxlen = sizeof(int), 457 .mode = 0644, 458 .proc_handler = proc_dointvec, 459 }, 460 #endif 461 #ifdef CONFIG_LOCK_STAT 462 { 463 .procname = "lock_stat", 464 .data = &lock_stat, 465 .maxlen = sizeof(int), 466 .mode = 0644, 467 .proc_handler = proc_dointvec, 468 }, 469 #endif 470 { 471 .procname = "panic", 472 .data = &panic_timeout, 473 .maxlen = sizeof(int), 474 .mode = 0644, 475 .proc_handler = proc_dointvec, 476 }, 477 #ifdef CONFIG_COREDUMP 478 { 479 .procname = "core_uses_pid", 480 .data = &core_uses_pid, 481 .maxlen = sizeof(int), 482 .mode = 0644, 483 .proc_handler = proc_dointvec, 484 }, 485 { 486 .procname = "core_pattern", 487 .data = core_pattern, 488 .maxlen = CORENAME_MAX_SIZE, 489 .mode = 0644, 490 .proc_handler = proc_dostring_coredump, 491 }, 492 { 493 .procname = "core_pipe_limit", 494 .data = &core_pipe_limit, 495 .maxlen = sizeof(unsigned int), 496 .mode = 0644, 497 .proc_handler = proc_dointvec, 498 }, 499 #endif 500 #ifdef CONFIG_PROC_SYSCTL 501 { 502 .procname = "tainted", 503 .maxlen = sizeof(long), 504 .mode = 0644, 505 .proc_handler = proc_taint, 506 }, 507 { 508 .procname = "sysctl_writes_strict", 509 .data = &sysctl_writes_strict, 510 .maxlen = sizeof(int), 511 .mode = 0644, 512 .proc_handler = proc_dointvec_minmax, 513 .extra1 = &neg_one, 514 .extra2 = &one, 515 }, 516 #endif 517 #ifdef CONFIG_LATENCYTOP 518 { 519 .procname = "latencytop", 520 .data = &latencytop_enabled, 521 .maxlen = sizeof(int), 522 .mode = 0644, 523 .proc_handler = sysctl_latencytop, 524 }, 525 #endif 526 #ifdef CONFIG_BLK_DEV_INITRD 527 { 528 .procname = "real-root-dev", 529 .data = &real_root_dev, 530 .maxlen = sizeof(int), 531 .mode = 0644, 532 .proc_handler = proc_dointvec, 533 }, 534 #endif 535 { 536 .procname = "print-fatal-signals", 537 .data = &print_fatal_signals, 538 .maxlen = sizeof(int), 539 .mode = 0644, 540 .proc_handler = proc_dointvec, 541 }, 542 #ifdef CONFIG_SPARC 543 { 544 .procname = "reboot-cmd", 545 .data = reboot_command, 546 .maxlen = 256, 547 .mode = 0644, 548 .proc_handler = proc_dostring, 549 }, 550 { 551 .procname = "stop-a", 552 .data = &stop_a_enabled, 553 .maxlen = sizeof (int), 554 .mode = 0644, 555 .proc_handler = proc_dointvec, 556 }, 557 { 558 .procname = "scons-poweroff", 559 .data = &scons_pwroff, 560 .maxlen = sizeof (int), 561 .mode = 0644, 562 .proc_handler = proc_dointvec, 563 }, 564 #endif 565 #ifdef CONFIG_SPARC64 566 { 567 .procname = "tsb-ratio", 568 .data = &sysctl_tsb_ratio, 569 .maxlen = sizeof (int), 570 .mode = 0644, 571 .proc_handler = proc_dointvec, 572 }, 573 #endif 574 #ifdef __hppa__ 575 { 576 .procname = "soft-power", 577 .data = &pwrsw_enabled, 578 .maxlen = sizeof (int), 579 .mode = 0644, 580 .proc_handler = proc_dointvec, 581 }, 582 #endif 583 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 584 { 585 .procname = "unaligned-trap", 586 .data = &unaligned_enabled, 587 .maxlen = sizeof (int), 588 .mode = 0644, 589 .proc_handler = proc_dointvec, 590 }, 591 #endif 592 { 593 .procname = "ctrl-alt-del", 594 .data = &C_A_D, 595 .maxlen = sizeof(int), 596 .mode = 0644, 597 .proc_handler = proc_dointvec, 598 }, 599 #ifdef CONFIG_FUNCTION_TRACER 600 { 601 .procname = "ftrace_enabled", 602 .data = &ftrace_enabled, 603 .maxlen = sizeof(int), 604 .mode = 0644, 605 .proc_handler = ftrace_enable_sysctl, 606 }, 607 #endif 608 #ifdef CONFIG_STACK_TRACER 609 { 610 .procname = "stack_tracer_enabled", 611 .data = &stack_tracer_enabled, 612 .maxlen = sizeof(int), 613 .mode = 0644, 614 .proc_handler = stack_trace_sysctl, 615 }, 616 #endif 617 #ifdef CONFIG_TRACING 618 { 619 .procname = "ftrace_dump_on_oops", 620 .data = &ftrace_dump_on_oops, 621 .maxlen = sizeof(int), 622 .mode = 0644, 623 .proc_handler = proc_dointvec, 624 }, 625 { 626 .procname = "traceoff_on_warning", 627 .data = &__disable_trace_on_warning, 628 .maxlen = sizeof(__disable_trace_on_warning), 629 .mode = 0644, 630 .proc_handler = proc_dointvec, 631 }, 632 { 633 .procname = "tracepoint_printk", 634 .data = &tracepoint_printk, 635 .maxlen = sizeof(tracepoint_printk), 636 .mode = 0644, 637 .proc_handler = proc_dointvec, 638 }, 639 #endif 640 #ifdef CONFIG_KEXEC_CORE 641 { 642 .procname = "kexec_load_disabled", 643 .data = &kexec_load_disabled, 644 .maxlen = sizeof(int), 645 .mode = 0644, 646 /* only handle a transition from default "0" to "1" */ 647 .proc_handler = proc_dointvec_minmax, 648 .extra1 = &one, 649 .extra2 = &one, 650 }, 651 #endif 652 #ifdef CONFIG_MODULES 653 { 654 .procname = "modprobe", 655 .data = &modprobe_path, 656 .maxlen = KMOD_PATH_LEN, 657 .mode = 0644, 658 .proc_handler = proc_dostring, 659 }, 660 { 661 .procname = "modules_disabled", 662 .data = &modules_disabled, 663 .maxlen = sizeof(int), 664 .mode = 0644, 665 /* only handle a transition from default "0" to "1" */ 666 .proc_handler = proc_dointvec_minmax, 667 .extra1 = &one, 668 .extra2 = &one, 669 }, 670 #endif 671 #ifdef CONFIG_UEVENT_HELPER 672 { 673 .procname = "hotplug", 674 .data = &uevent_helper, 675 .maxlen = UEVENT_HELPER_PATH_LEN, 676 .mode = 0644, 677 .proc_handler = proc_dostring, 678 }, 679 #endif 680 #ifdef CONFIG_CHR_DEV_SG 681 { 682 .procname = "sg-big-buff", 683 .data = &sg_big_buff, 684 .maxlen = sizeof (int), 685 .mode = 0444, 686 .proc_handler = proc_dointvec, 687 }, 688 #endif 689 #ifdef CONFIG_BSD_PROCESS_ACCT 690 { 691 .procname = "acct", 692 .data = &acct_parm, 693 .maxlen = 3*sizeof(int), 694 .mode = 0644, 695 .proc_handler = proc_dointvec, 696 }, 697 #endif 698 #ifdef CONFIG_MAGIC_SYSRQ 699 { 700 .procname = "sysrq", 701 .data = &__sysrq_enabled, 702 .maxlen = sizeof (int), 703 .mode = 0644, 704 .proc_handler = sysrq_sysctl_handler, 705 }, 706 #endif 707 #ifdef CONFIG_PROC_SYSCTL 708 { 709 .procname = "cad_pid", 710 .data = NULL, 711 .maxlen = sizeof (int), 712 .mode = 0600, 713 .proc_handler = proc_do_cad_pid, 714 }, 715 #endif 716 { 717 .procname = "threads-max", 718 .data = NULL, 719 .maxlen = sizeof(int), 720 .mode = 0644, 721 .proc_handler = sysctl_max_threads, 722 }, 723 { 724 .procname = "random", 725 .mode = 0555, 726 .child = random_table, 727 }, 728 { 729 .procname = "usermodehelper", 730 .mode = 0555, 731 .child = usermodehelper_table, 732 }, 733 { 734 .procname = "overflowuid", 735 .data = &overflowuid, 736 .maxlen = sizeof(int), 737 .mode = 0644, 738 .proc_handler = proc_dointvec_minmax, 739 .extra1 = &minolduid, 740 .extra2 = &maxolduid, 741 }, 742 { 743 .procname = "overflowgid", 744 .data = &overflowgid, 745 .maxlen = sizeof(int), 746 .mode = 0644, 747 .proc_handler = proc_dointvec_minmax, 748 .extra1 = &minolduid, 749 .extra2 = &maxolduid, 750 }, 751 #ifdef CONFIG_S390 752 #ifdef CONFIG_MATHEMU 753 { 754 .procname = "ieee_emulation_warnings", 755 .data = &sysctl_ieee_emulation_warnings, 756 .maxlen = sizeof(int), 757 .mode = 0644, 758 .proc_handler = proc_dointvec, 759 }, 760 #endif 761 { 762 .procname = "userprocess_debug", 763 .data = &show_unhandled_signals, 764 .maxlen = sizeof(int), 765 .mode = 0644, 766 .proc_handler = proc_dointvec, 767 }, 768 #endif 769 { 770 .procname = "pid_max", 771 .data = &pid_max, 772 .maxlen = sizeof (int), 773 .mode = 0644, 774 .proc_handler = proc_dointvec_minmax, 775 .extra1 = &pid_max_min, 776 .extra2 = &pid_max_max, 777 }, 778 { 779 .procname = "panic_on_oops", 780 .data = &panic_on_oops, 781 .maxlen = sizeof(int), 782 .mode = 0644, 783 .proc_handler = proc_dointvec, 784 }, 785 #if defined CONFIG_PRINTK 786 { 787 .procname = "printk", 788 .data = &console_loglevel, 789 .maxlen = 4*sizeof(int), 790 .mode = 0644, 791 .proc_handler = proc_dointvec, 792 }, 793 { 794 .procname = "printk_ratelimit", 795 .data = &printk_ratelimit_state.interval, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec_jiffies, 799 }, 800 { 801 .procname = "printk_ratelimit_burst", 802 .data = &printk_ratelimit_state.burst, 803 .maxlen = sizeof(int), 804 .mode = 0644, 805 .proc_handler = proc_dointvec, 806 }, 807 { 808 .procname = "printk_delay", 809 .data = &printk_delay_msec, 810 .maxlen = sizeof(int), 811 .mode = 0644, 812 .proc_handler = proc_dointvec_minmax, 813 .extra1 = &zero, 814 .extra2 = &ten_thousand, 815 }, 816 { 817 .procname = "printk_devkmsg", 818 .data = devkmsg_log_str, 819 .maxlen = DEVKMSG_STR_MAX_SIZE, 820 .mode = 0644, 821 .proc_handler = devkmsg_sysctl_set_loglvl, 822 }, 823 { 824 .procname = "dmesg_restrict", 825 .data = &dmesg_restrict, 826 .maxlen = sizeof(int), 827 .mode = 0644, 828 .proc_handler = proc_dointvec_minmax_sysadmin, 829 .extra1 = &zero, 830 .extra2 = &one, 831 }, 832 { 833 .procname = "kptr_restrict", 834 .data = &kptr_restrict, 835 .maxlen = sizeof(int), 836 .mode = 0644, 837 .proc_handler = proc_dointvec_minmax_sysadmin, 838 .extra1 = &zero, 839 .extra2 = &two, 840 }, 841 #endif 842 { 843 .procname = "ngroups_max", 844 .data = &ngroups_max, 845 .maxlen = sizeof (int), 846 .mode = 0444, 847 .proc_handler = proc_dointvec, 848 }, 849 { 850 .procname = "cap_last_cap", 851 .data = (void *)&cap_last_cap, 852 .maxlen = sizeof(int), 853 .mode = 0444, 854 .proc_handler = proc_dointvec, 855 }, 856 #if defined(CONFIG_LOCKUP_DETECTOR) 857 { 858 .procname = "watchdog", 859 .data = &watchdog_user_enabled, 860 .maxlen = sizeof (int), 861 .mode = 0644, 862 .proc_handler = proc_watchdog, 863 .extra1 = &zero, 864 .extra2 = &one, 865 }, 866 { 867 .procname = "watchdog_thresh", 868 .data = &watchdog_thresh, 869 .maxlen = sizeof(int), 870 .mode = 0644, 871 .proc_handler = proc_watchdog_thresh, 872 .extra1 = &zero, 873 .extra2 = &sixty, 874 }, 875 { 876 .procname = "nmi_watchdog", 877 .data = &nmi_watchdog_enabled, 878 .maxlen = sizeof (int), 879 .mode = 0644, 880 .proc_handler = proc_nmi_watchdog, 881 .extra1 = &zero, 882 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) 883 .extra2 = &one, 884 #else 885 .extra2 = &zero, 886 #endif 887 }, 888 { 889 .procname = "soft_watchdog", 890 .data = &soft_watchdog_enabled, 891 .maxlen = sizeof (int), 892 .mode = 0644, 893 .proc_handler = proc_soft_watchdog, 894 .extra1 = &zero, 895 .extra2 = &one, 896 }, 897 { 898 .procname = "watchdog_cpumask", 899 .data = &watchdog_cpumask_bits, 900 .maxlen = NR_CPUS, 901 .mode = 0644, 902 .proc_handler = proc_watchdog_cpumask, 903 }, 904 { 905 .procname = "softlockup_panic", 906 .data = &softlockup_panic, 907 .maxlen = sizeof(int), 908 .mode = 0644, 909 .proc_handler = proc_dointvec_minmax, 910 .extra1 = &zero, 911 .extra2 = &one, 912 }, 913 #ifdef CONFIG_HARDLOCKUP_DETECTOR 914 { 915 .procname = "hardlockup_panic", 916 .data = &hardlockup_panic, 917 .maxlen = sizeof(int), 918 .mode = 0644, 919 .proc_handler = proc_dointvec_minmax, 920 .extra1 = &zero, 921 .extra2 = &one, 922 }, 923 #endif 924 #ifdef CONFIG_SMP 925 { 926 .procname = "softlockup_all_cpu_backtrace", 927 .data = &sysctl_softlockup_all_cpu_backtrace, 928 .maxlen = sizeof(int), 929 .mode = 0644, 930 .proc_handler = proc_dointvec_minmax, 931 .extra1 = &zero, 932 .extra2 = &one, 933 }, 934 { 935 .procname = "hardlockup_all_cpu_backtrace", 936 .data = &sysctl_hardlockup_all_cpu_backtrace, 937 .maxlen = sizeof(int), 938 .mode = 0644, 939 .proc_handler = proc_dointvec_minmax, 940 .extra1 = &zero, 941 .extra2 = &one, 942 }, 943 #endif /* CONFIG_SMP */ 944 #endif 945 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 946 { 947 .procname = "unknown_nmi_panic", 948 .data = &unknown_nmi_panic, 949 .maxlen = sizeof (int), 950 .mode = 0644, 951 .proc_handler = proc_dointvec, 952 }, 953 #endif 954 #if defined(CONFIG_X86) 955 { 956 .procname = "panic_on_unrecovered_nmi", 957 .data = &panic_on_unrecovered_nmi, 958 .maxlen = sizeof(int), 959 .mode = 0644, 960 .proc_handler = proc_dointvec, 961 }, 962 { 963 .procname = "panic_on_io_nmi", 964 .data = &panic_on_io_nmi, 965 .maxlen = sizeof(int), 966 .mode = 0644, 967 .proc_handler = proc_dointvec, 968 }, 969 #ifdef CONFIG_DEBUG_STACKOVERFLOW 970 { 971 .procname = "panic_on_stackoverflow", 972 .data = &sysctl_panic_on_stackoverflow, 973 .maxlen = sizeof(int), 974 .mode = 0644, 975 .proc_handler = proc_dointvec, 976 }, 977 #endif 978 { 979 .procname = "bootloader_type", 980 .data = &bootloader_type, 981 .maxlen = sizeof (int), 982 .mode = 0444, 983 .proc_handler = proc_dointvec, 984 }, 985 { 986 .procname = "bootloader_version", 987 .data = &bootloader_version, 988 .maxlen = sizeof (int), 989 .mode = 0444, 990 .proc_handler = proc_dointvec, 991 }, 992 { 993 .procname = "kstack_depth_to_print", 994 .data = &kstack_depth_to_print, 995 .maxlen = sizeof(int), 996 .mode = 0644, 997 .proc_handler = proc_dointvec, 998 }, 999 { 1000 .procname = "io_delay_type", 1001 .data = &io_delay_type, 1002 .maxlen = sizeof(int), 1003 .mode = 0644, 1004 .proc_handler = proc_dointvec, 1005 }, 1006 #endif 1007 #if defined(CONFIG_MMU) 1008 { 1009 .procname = "randomize_va_space", 1010 .data = &randomize_va_space, 1011 .maxlen = sizeof(int), 1012 .mode = 0644, 1013 .proc_handler = proc_dointvec, 1014 }, 1015 #endif 1016 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1017 { 1018 .procname = "spin_retry", 1019 .data = &spin_retry, 1020 .maxlen = sizeof (int), 1021 .mode = 0644, 1022 .proc_handler = proc_dointvec, 1023 }, 1024 #endif 1025 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1026 { 1027 .procname = "acpi_video_flags", 1028 .data = &acpi_realmode_flags, 1029 .maxlen = sizeof (unsigned long), 1030 .mode = 0644, 1031 .proc_handler = proc_doulongvec_minmax, 1032 }, 1033 #endif 1034 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1035 { 1036 .procname = "ignore-unaligned-usertrap", 1037 .data = &no_unaligned_warning, 1038 .maxlen = sizeof (int), 1039 .mode = 0644, 1040 .proc_handler = proc_dointvec, 1041 }, 1042 #endif 1043 #ifdef CONFIG_IA64 1044 { 1045 .procname = "unaligned-dump-stack", 1046 .data = &unaligned_dump_stack, 1047 .maxlen = sizeof (int), 1048 .mode = 0644, 1049 .proc_handler = proc_dointvec, 1050 }, 1051 #endif 1052 #ifdef CONFIG_DETECT_HUNG_TASK 1053 { 1054 .procname = "hung_task_panic", 1055 .data = &sysctl_hung_task_panic, 1056 .maxlen = sizeof(int), 1057 .mode = 0644, 1058 .proc_handler = proc_dointvec_minmax, 1059 .extra1 = &zero, 1060 .extra2 = &one, 1061 }, 1062 { 1063 .procname = "hung_task_check_count", 1064 .data = &sysctl_hung_task_check_count, 1065 .maxlen = sizeof(int), 1066 .mode = 0644, 1067 .proc_handler = proc_dointvec_minmax, 1068 .extra1 = &zero, 1069 }, 1070 { 1071 .procname = "hung_task_timeout_secs", 1072 .data = &sysctl_hung_task_timeout_secs, 1073 .maxlen = sizeof(unsigned long), 1074 .mode = 0644, 1075 .proc_handler = proc_dohung_task_timeout_secs, 1076 .extra2 = &hung_task_timeout_max, 1077 }, 1078 { 1079 .procname = "hung_task_warnings", 1080 .data = &sysctl_hung_task_warnings, 1081 .maxlen = sizeof(int), 1082 .mode = 0644, 1083 .proc_handler = proc_dointvec_minmax, 1084 .extra1 = &neg_one, 1085 }, 1086 #endif 1087 #ifdef CONFIG_RT_MUTEXES 1088 { 1089 .procname = "max_lock_depth", 1090 .data = &max_lock_depth, 1091 .maxlen = sizeof(int), 1092 .mode = 0644, 1093 .proc_handler = proc_dointvec, 1094 }, 1095 #endif 1096 { 1097 .procname = "poweroff_cmd", 1098 .data = &poweroff_cmd, 1099 .maxlen = POWEROFF_CMD_PATH_LEN, 1100 .mode = 0644, 1101 .proc_handler = proc_dostring, 1102 }, 1103 #ifdef CONFIG_KEYS 1104 { 1105 .procname = "keys", 1106 .mode = 0555, 1107 .child = key_sysctls, 1108 }, 1109 #endif 1110 #ifdef CONFIG_PERF_EVENTS 1111 /* 1112 * User-space scripts rely on the existence of this file 1113 * as a feature check for perf_events being enabled. 1114 * 1115 * So it's an ABI, do not remove! 1116 */ 1117 { 1118 .procname = "perf_event_paranoid", 1119 .data = &sysctl_perf_event_paranoid, 1120 .maxlen = sizeof(sysctl_perf_event_paranoid), 1121 .mode = 0644, 1122 .proc_handler = proc_dointvec, 1123 }, 1124 { 1125 .procname = "perf_event_mlock_kb", 1126 .data = &sysctl_perf_event_mlock, 1127 .maxlen = sizeof(sysctl_perf_event_mlock), 1128 .mode = 0644, 1129 .proc_handler = proc_dointvec, 1130 }, 1131 { 1132 .procname = "perf_event_max_sample_rate", 1133 .data = &sysctl_perf_event_sample_rate, 1134 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1135 .mode = 0644, 1136 .proc_handler = perf_proc_update_handler, 1137 .extra1 = &one, 1138 }, 1139 { 1140 .procname = "perf_cpu_time_max_percent", 1141 .data = &sysctl_perf_cpu_time_max_percent, 1142 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1143 .mode = 0644, 1144 .proc_handler = perf_cpu_time_max_percent_handler, 1145 .extra1 = &zero, 1146 .extra2 = &one_hundred, 1147 }, 1148 { 1149 .procname = "perf_event_max_stack", 1150 .data = &sysctl_perf_event_max_stack, 1151 .maxlen = sizeof(sysctl_perf_event_max_stack), 1152 .mode = 0644, 1153 .proc_handler = perf_event_max_stack_handler, 1154 .extra1 = &zero, 1155 .extra2 = &six_hundred_forty_kb, 1156 }, 1157 { 1158 .procname = "perf_event_max_contexts_per_stack", 1159 .data = &sysctl_perf_event_max_contexts_per_stack, 1160 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1161 .mode = 0644, 1162 .proc_handler = perf_event_max_stack_handler, 1163 .extra1 = &zero, 1164 .extra2 = &one_thousand, 1165 }, 1166 #endif 1167 #ifdef CONFIG_KMEMCHECK 1168 { 1169 .procname = "kmemcheck", 1170 .data = &kmemcheck_enabled, 1171 .maxlen = sizeof(int), 1172 .mode = 0644, 1173 .proc_handler = proc_dointvec, 1174 }, 1175 #endif 1176 { 1177 .procname = "panic_on_warn", 1178 .data = &panic_on_warn, 1179 .maxlen = sizeof(int), 1180 .mode = 0644, 1181 .proc_handler = proc_dointvec_minmax, 1182 .extra1 = &zero, 1183 .extra2 = &one, 1184 }, 1185 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1186 { 1187 .procname = "timer_migration", 1188 .data = &sysctl_timer_migration, 1189 .maxlen = sizeof(unsigned int), 1190 .mode = 0644, 1191 .proc_handler = timer_migration_handler, 1192 }, 1193 #endif 1194 #ifdef CONFIG_BPF_SYSCALL 1195 { 1196 .procname = "unprivileged_bpf_disabled", 1197 .data = &sysctl_unprivileged_bpf_disabled, 1198 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1199 .mode = 0644, 1200 /* only handle a transition from default "0" to "1" */ 1201 .proc_handler = proc_dointvec_minmax, 1202 .extra1 = &one, 1203 .extra2 = &one, 1204 }, 1205 #endif 1206 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1207 { 1208 .procname = "panic_on_rcu_stall", 1209 .data = &sysctl_panic_on_rcu_stall, 1210 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1211 .mode = 0644, 1212 .proc_handler = proc_dointvec_minmax, 1213 .extra1 = &zero, 1214 .extra2 = &one, 1215 }, 1216 #endif 1217 { } 1218 }; 1219 1220 static struct ctl_table vm_table[] = { 1221 { 1222 .procname = "overcommit_memory", 1223 .data = &sysctl_overcommit_memory, 1224 .maxlen = sizeof(sysctl_overcommit_memory), 1225 .mode = 0644, 1226 .proc_handler = proc_dointvec_minmax, 1227 .extra1 = &zero, 1228 .extra2 = &two, 1229 }, 1230 { 1231 .procname = "panic_on_oom", 1232 .data = &sysctl_panic_on_oom, 1233 .maxlen = sizeof(sysctl_panic_on_oom), 1234 .mode = 0644, 1235 .proc_handler = proc_dointvec_minmax, 1236 .extra1 = &zero, 1237 .extra2 = &two, 1238 }, 1239 { 1240 .procname = "oom_kill_allocating_task", 1241 .data = &sysctl_oom_kill_allocating_task, 1242 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1243 .mode = 0644, 1244 .proc_handler = proc_dointvec, 1245 }, 1246 { 1247 .procname = "oom_dump_tasks", 1248 .data = &sysctl_oom_dump_tasks, 1249 .maxlen = sizeof(sysctl_oom_dump_tasks), 1250 .mode = 0644, 1251 .proc_handler = proc_dointvec, 1252 }, 1253 { 1254 .procname = "overcommit_ratio", 1255 .data = &sysctl_overcommit_ratio, 1256 .maxlen = sizeof(sysctl_overcommit_ratio), 1257 .mode = 0644, 1258 .proc_handler = overcommit_ratio_handler, 1259 }, 1260 { 1261 .procname = "overcommit_kbytes", 1262 .data = &sysctl_overcommit_kbytes, 1263 .maxlen = sizeof(sysctl_overcommit_kbytes), 1264 .mode = 0644, 1265 .proc_handler = overcommit_kbytes_handler, 1266 }, 1267 { 1268 .procname = "page-cluster", 1269 .data = &page_cluster, 1270 .maxlen = sizeof(int), 1271 .mode = 0644, 1272 .proc_handler = proc_dointvec_minmax, 1273 .extra1 = &zero, 1274 }, 1275 { 1276 .procname = "dirty_background_ratio", 1277 .data = &dirty_background_ratio, 1278 .maxlen = sizeof(dirty_background_ratio), 1279 .mode = 0644, 1280 .proc_handler = dirty_background_ratio_handler, 1281 .extra1 = &zero, 1282 .extra2 = &one_hundred, 1283 }, 1284 { 1285 .procname = "dirty_background_bytes", 1286 .data = &dirty_background_bytes, 1287 .maxlen = sizeof(dirty_background_bytes), 1288 .mode = 0644, 1289 .proc_handler = dirty_background_bytes_handler, 1290 .extra1 = &one_ul, 1291 }, 1292 { 1293 .procname = "dirty_ratio", 1294 .data = &vm_dirty_ratio, 1295 .maxlen = sizeof(vm_dirty_ratio), 1296 .mode = 0644, 1297 .proc_handler = dirty_ratio_handler, 1298 .extra1 = &zero, 1299 .extra2 = &one_hundred, 1300 }, 1301 { 1302 .procname = "dirty_bytes", 1303 .data = &vm_dirty_bytes, 1304 .maxlen = sizeof(vm_dirty_bytes), 1305 .mode = 0644, 1306 .proc_handler = dirty_bytes_handler, 1307 .extra1 = &dirty_bytes_min, 1308 }, 1309 { 1310 .procname = "dirty_writeback_centisecs", 1311 .data = &dirty_writeback_interval, 1312 .maxlen = sizeof(dirty_writeback_interval), 1313 .mode = 0644, 1314 .proc_handler = dirty_writeback_centisecs_handler, 1315 }, 1316 { 1317 .procname = "dirty_expire_centisecs", 1318 .data = &dirty_expire_interval, 1319 .maxlen = sizeof(dirty_expire_interval), 1320 .mode = 0644, 1321 .proc_handler = proc_dointvec_minmax, 1322 .extra1 = &zero, 1323 }, 1324 { 1325 .procname = "dirtytime_expire_seconds", 1326 .data = &dirtytime_expire_interval, 1327 .maxlen = sizeof(dirty_expire_interval), 1328 .mode = 0644, 1329 .proc_handler = dirtytime_interval_handler, 1330 .extra1 = &zero, 1331 }, 1332 { 1333 .procname = "nr_pdflush_threads", 1334 .mode = 0444 /* read-only */, 1335 .proc_handler = pdflush_proc_obsolete, 1336 }, 1337 { 1338 .procname = "swappiness", 1339 .data = &vm_swappiness, 1340 .maxlen = sizeof(vm_swappiness), 1341 .mode = 0644, 1342 .proc_handler = proc_dointvec_minmax, 1343 .extra1 = &zero, 1344 .extra2 = &one_hundred, 1345 }, 1346 #ifdef CONFIG_HUGETLB_PAGE 1347 { 1348 .procname = "nr_hugepages", 1349 .data = NULL, 1350 .maxlen = sizeof(unsigned long), 1351 .mode = 0644, 1352 .proc_handler = hugetlb_sysctl_handler, 1353 }, 1354 #ifdef CONFIG_NUMA 1355 { 1356 .procname = "nr_hugepages_mempolicy", 1357 .data = NULL, 1358 .maxlen = sizeof(unsigned long), 1359 .mode = 0644, 1360 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1361 }, 1362 #endif 1363 { 1364 .procname = "hugetlb_shm_group", 1365 .data = &sysctl_hugetlb_shm_group, 1366 .maxlen = sizeof(gid_t), 1367 .mode = 0644, 1368 .proc_handler = proc_dointvec, 1369 }, 1370 { 1371 .procname = "hugepages_treat_as_movable", 1372 .data = &hugepages_treat_as_movable, 1373 .maxlen = sizeof(int), 1374 .mode = 0644, 1375 .proc_handler = proc_dointvec, 1376 }, 1377 { 1378 .procname = "nr_overcommit_hugepages", 1379 .data = NULL, 1380 .maxlen = sizeof(unsigned long), 1381 .mode = 0644, 1382 .proc_handler = hugetlb_overcommit_handler, 1383 }, 1384 #endif 1385 { 1386 .procname = "lowmem_reserve_ratio", 1387 .data = &sysctl_lowmem_reserve_ratio, 1388 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1389 .mode = 0644, 1390 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1391 }, 1392 { 1393 .procname = "drop_caches", 1394 .data = &sysctl_drop_caches, 1395 .maxlen = sizeof(int), 1396 .mode = 0644, 1397 .proc_handler = drop_caches_sysctl_handler, 1398 .extra1 = &one, 1399 .extra2 = &four, 1400 }, 1401 #ifdef CONFIG_COMPACTION 1402 { 1403 .procname = "compact_memory", 1404 .data = &sysctl_compact_memory, 1405 .maxlen = sizeof(int), 1406 .mode = 0200, 1407 .proc_handler = sysctl_compaction_handler, 1408 }, 1409 { 1410 .procname = "extfrag_threshold", 1411 .data = &sysctl_extfrag_threshold, 1412 .maxlen = sizeof(int), 1413 .mode = 0644, 1414 .proc_handler = sysctl_extfrag_handler, 1415 .extra1 = &min_extfrag_threshold, 1416 .extra2 = &max_extfrag_threshold, 1417 }, 1418 { 1419 .procname = "compact_unevictable_allowed", 1420 .data = &sysctl_compact_unevictable_allowed, 1421 .maxlen = sizeof(int), 1422 .mode = 0644, 1423 .proc_handler = proc_dointvec, 1424 .extra1 = &zero, 1425 .extra2 = &one, 1426 }, 1427 1428 #endif /* CONFIG_COMPACTION */ 1429 { 1430 .procname = "min_free_kbytes", 1431 .data = &min_free_kbytes, 1432 .maxlen = sizeof(min_free_kbytes), 1433 .mode = 0644, 1434 .proc_handler = min_free_kbytes_sysctl_handler, 1435 .extra1 = &zero, 1436 }, 1437 { 1438 .procname = "watermark_scale_factor", 1439 .data = &watermark_scale_factor, 1440 .maxlen = sizeof(watermark_scale_factor), 1441 .mode = 0644, 1442 .proc_handler = watermark_scale_factor_sysctl_handler, 1443 .extra1 = &one, 1444 .extra2 = &one_thousand, 1445 }, 1446 { 1447 .procname = "percpu_pagelist_fraction", 1448 .data = &percpu_pagelist_fraction, 1449 .maxlen = sizeof(percpu_pagelist_fraction), 1450 .mode = 0644, 1451 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1452 .extra1 = &zero, 1453 }, 1454 #ifdef CONFIG_MMU 1455 { 1456 .procname = "max_map_count", 1457 .data = &sysctl_max_map_count, 1458 .maxlen = sizeof(sysctl_max_map_count), 1459 .mode = 0644, 1460 .proc_handler = proc_dointvec_minmax, 1461 .extra1 = &zero, 1462 }, 1463 #else 1464 { 1465 .procname = "nr_trim_pages", 1466 .data = &sysctl_nr_trim_pages, 1467 .maxlen = sizeof(sysctl_nr_trim_pages), 1468 .mode = 0644, 1469 .proc_handler = proc_dointvec_minmax, 1470 .extra1 = &zero, 1471 }, 1472 #endif 1473 { 1474 .procname = "laptop_mode", 1475 .data = &laptop_mode, 1476 .maxlen = sizeof(laptop_mode), 1477 .mode = 0644, 1478 .proc_handler = proc_dointvec_jiffies, 1479 }, 1480 { 1481 .procname = "block_dump", 1482 .data = &block_dump, 1483 .maxlen = sizeof(block_dump), 1484 .mode = 0644, 1485 .proc_handler = proc_dointvec, 1486 .extra1 = &zero, 1487 }, 1488 { 1489 .procname = "vfs_cache_pressure", 1490 .data = &sysctl_vfs_cache_pressure, 1491 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1492 .mode = 0644, 1493 .proc_handler = proc_dointvec, 1494 .extra1 = &zero, 1495 }, 1496 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1497 { 1498 .procname = "legacy_va_layout", 1499 .data = &sysctl_legacy_va_layout, 1500 .maxlen = sizeof(sysctl_legacy_va_layout), 1501 .mode = 0644, 1502 .proc_handler = proc_dointvec, 1503 .extra1 = &zero, 1504 }, 1505 #endif 1506 #ifdef CONFIG_NUMA 1507 { 1508 .procname = "zone_reclaim_mode", 1509 .data = &node_reclaim_mode, 1510 .maxlen = sizeof(node_reclaim_mode), 1511 .mode = 0644, 1512 .proc_handler = proc_dointvec, 1513 .extra1 = &zero, 1514 }, 1515 { 1516 .procname = "min_unmapped_ratio", 1517 .data = &sysctl_min_unmapped_ratio, 1518 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1519 .mode = 0644, 1520 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1521 .extra1 = &zero, 1522 .extra2 = &one_hundred, 1523 }, 1524 { 1525 .procname = "min_slab_ratio", 1526 .data = &sysctl_min_slab_ratio, 1527 .maxlen = sizeof(sysctl_min_slab_ratio), 1528 .mode = 0644, 1529 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1530 .extra1 = &zero, 1531 .extra2 = &one_hundred, 1532 }, 1533 #endif 1534 #ifdef CONFIG_SMP 1535 { 1536 .procname = "stat_interval", 1537 .data = &sysctl_stat_interval, 1538 .maxlen = sizeof(sysctl_stat_interval), 1539 .mode = 0644, 1540 .proc_handler = proc_dointvec_jiffies, 1541 }, 1542 { 1543 .procname = "stat_refresh", 1544 .data = NULL, 1545 .maxlen = 0, 1546 .mode = 0600, 1547 .proc_handler = vmstat_refresh, 1548 }, 1549 #endif 1550 #ifdef CONFIG_MMU 1551 { 1552 .procname = "mmap_min_addr", 1553 .data = &dac_mmap_min_addr, 1554 .maxlen = sizeof(unsigned long), 1555 .mode = 0644, 1556 .proc_handler = mmap_min_addr_handler, 1557 }, 1558 #endif 1559 #ifdef CONFIG_NUMA 1560 { 1561 .procname = "numa_zonelist_order", 1562 .data = &numa_zonelist_order, 1563 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1564 .mode = 0644, 1565 .proc_handler = numa_zonelist_order_handler, 1566 }, 1567 #endif 1568 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1569 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1570 { 1571 .procname = "vdso_enabled", 1572 #ifdef CONFIG_X86_32 1573 .data = &vdso32_enabled, 1574 .maxlen = sizeof(vdso32_enabled), 1575 #else 1576 .data = &vdso_enabled, 1577 .maxlen = sizeof(vdso_enabled), 1578 #endif 1579 .mode = 0644, 1580 .proc_handler = proc_dointvec, 1581 .extra1 = &zero, 1582 }, 1583 #endif 1584 #ifdef CONFIG_HIGHMEM 1585 { 1586 .procname = "highmem_is_dirtyable", 1587 .data = &vm_highmem_is_dirtyable, 1588 .maxlen = sizeof(vm_highmem_is_dirtyable), 1589 .mode = 0644, 1590 .proc_handler = proc_dointvec_minmax, 1591 .extra1 = &zero, 1592 .extra2 = &one, 1593 }, 1594 #endif 1595 #ifdef CONFIG_MEMORY_FAILURE 1596 { 1597 .procname = "memory_failure_early_kill", 1598 .data = &sysctl_memory_failure_early_kill, 1599 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1600 .mode = 0644, 1601 .proc_handler = proc_dointvec_minmax, 1602 .extra1 = &zero, 1603 .extra2 = &one, 1604 }, 1605 { 1606 .procname = "memory_failure_recovery", 1607 .data = &sysctl_memory_failure_recovery, 1608 .maxlen = sizeof(sysctl_memory_failure_recovery), 1609 .mode = 0644, 1610 .proc_handler = proc_dointvec_minmax, 1611 .extra1 = &zero, 1612 .extra2 = &one, 1613 }, 1614 #endif 1615 { 1616 .procname = "user_reserve_kbytes", 1617 .data = &sysctl_user_reserve_kbytes, 1618 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1619 .mode = 0644, 1620 .proc_handler = proc_doulongvec_minmax, 1621 }, 1622 { 1623 .procname = "admin_reserve_kbytes", 1624 .data = &sysctl_admin_reserve_kbytes, 1625 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1626 .mode = 0644, 1627 .proc_handler = proc_doulongvec_minmax, 1628 }, 1629 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1630 { 1631 .procname = "mmap_rnd_bits", 1632 .data = &mmap_rnd_bits, 1633 .maxlen = sizeof(mmap_rnd_bits), 1634 .mode = 0600, 1635 .proc_handler = proc_dointvec_minmax, 1636 .extra1 = (void *)&mmap_rnd_bits_min, 1637 .extra2 = (void *)&mmap_rnd_bits_max, 1638 }, 1639 #endif 1640 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1641 { 1642 .procname = "mmap_rnd_compat_bits", 1643 .data = &mmap_rnd_compat_bits, 1644 .maxlen = sizeof(mmap_rnd_compat_bits), 1645 .mode = 0600, 1646 .proc_handler = proc_dointvec_minmax, 1647 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1648 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1649 }, 1650 #endif 1651 { } 1652 }; 1653 1654 static struct ctl_table fs_table[] = { 1655 { 1656 .procname = "inode-nr", 1657 .data = &inodes_stat, 1658 .maxlen = 2*sizeof(long), 1659 .mode = 0444, 1660 .proc_handler = proc_nr_inodes, 1661 }, 1662 { 1663 .procname = "inode-state", 1664 .data = &inodes_stat, 1665 .maxlen = 7*sizeof(long), 1666 .mode = 0444, 1667 .proc_handler = proc_nr_inodes, 1668 }, 1669 { 1670 .procname = "file-nr", 1671 .data = &files_stat, 1672 .maxlen = sizeof(files_stat), 1673 .mode = 0444, 1674 .proc_handler = proc_nr_files, 1675 }, 1676 { 1677 .procname = "file-max", 1678 .data = &files_stat.max_files, 1679 .maxlen = sizeof(files_stat.max_files), 1680 .mode = 0644, 1681 .proc_handler = proc_doulongvec_minmax, 1682 }, 1683 { 1684 .procname = "nr_open", 1685 .data = &sysctl_nr_open, 1686 .maxlen = sizeof(unsigned int), 1687 .mode = 0644, 1688 .proc_handler = proc_dointvec_minmax, 1689 .extra1 = &sysctl_nr_open_min, 1690 .extra2 = &sysctl_nr_open_max, 1691 }, 1692 { 1693 .procname = "dentry-state", 1694 .data = &dentry_stat, 1695 .maxlen = 6*sizeof(long), 1696 .mode = 0444, 1697 .proc_handler = proc_nr_dentry, 1698 }, 1699 { 1700 .procname = "overflowuid", 1701 .data = &fs_overflowuid, 1702 .maxlen = sizeof(int), 1703 .mode = 0644, 1704 .proc_handler = proc_dointvec_minmax, 1705 .extra1 = &minolduid, 1706 .extra2 = &maxolduid, 1707 }, 1708 { 1709 .procname = "overflowgid", 1710 .data = &fs_overflowgid, 1711 .maxlen = sizeof(int), 1712 .mode = 0644, 1713 .proc_handler = proc_dointvec_minmax, 1714 .extra1 = &minolduid, 1715 .extra2 = &maxolduid, 1716 }, 1717 #ifdef CONFIG_FILE_LOCKING 1718 { 1719 .procname = "leases-enable", 1720 .data = &leases_enable, 1721 .maxlen = sizeof(int), 1722 .mode = 0644, 1723 .proc_handler = proc_dointvec, 1724 }, 1725 #endif 1726 #ifdef CONFIG_DNOTIFY 1727 { 1728 .procname = "dir-notify-enable", 1729 .data = &dir_notify_enable, 1730 .maxlen = sizeof(int), 1731 .mode = 0644, 1732 .proc_handler = proc_dointvec, 1733 }, 1734 #endif 1735 #ifdef CONFIG_MMU 1736 #ifdef CONFIG_FILE_LOCKING 1737 { 1738 .procname = "lease-break-time", 1739 .data = &lease_break_time, 1740 .maxlen = sizeof(int), 1741 .mode = 0644, 1742 .proc_handler = proc_dointvec, 1743 }, 1744 #endif 1745 #ifdef CONFIG_AIO 1746 { 1747 .procname = "aio-nr", 1748 .data = &aio_nr, 1749 .maxlen = sizeof(aio_nr), 1750 .mode = 0444, 1751 .proc_handler = proc_doulongvec_minmax, 1752 }, 1753 { 1754 .procname = "aio-max-nr", 1755 .data = &aio_max_nr, 1756 .maxlen = sizeof(aio_max_nr), 1757 .mode = 0644, 1758 .proc_handler = proc_doulongvec_minmax, 1759 }, 1760 #endif /* CONFIG_AIO */ 1761 #ifdef CONFIG_INOTIFY_USER 1762 { 1763 .procname = "inotify", 1764 .mode = 0555, 1765 .child = inotify_table, 1766 }, 1767 #endif 1768 #ifdef CONFIG_EPOLL 1769 { 1770 .procname = "epoll", 1771 .mode = 0555, 1772 .child = epoll_table, 1773 }, 1774 #endif 1775 #endif 1776 { 1777 .procname = "protected_symlinks", 1778 .data = &sysctl_protected_symlinks, 1779 .maxlen = sizeof(int), 1780 .mode = 0600, 1781 .proc_handler = proc_dointvec_minmax, 1782 .extra1 = &zero, 1783 .extra2 = &one, 1784 }, 1785 { 1786 .procname = "protected_hardlinks", 1787 .data = &sysctl_protected_hardlinks, 1788 .maxlen = sizeof(int), 1789 .mode = 0600, 1790 .proc_handler = proc_dointvec_minmax, 1791 .extra1 = &zero, 1792 .extra2 = &one, 1793 }, 1794 { 1795 .procname = "suid_dumpable", 1796 .data = &suid_dumpable, 1797 .maxlen = sizeof(int), 1798 .mode = 0644, 1799 .proc_handler = proc_dointvec_minmax_coredump, 1800 .extra1 = &zero, 1801 .extra2 = &two, 1802 }, 1803 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1804 { 1805 .procname = "binfmt_misc", 1806 .mode = 0555, 1807 .child = sysctl_mount_point, 1808 }, 1809 #endif 1810 { 1811 .procname = "pipe-max-size", 1812 .data = &pipe_max_size, 1813 .maxlen = sizeof(int), 1814 .mode = 0644, 1815 .proc_handler = &pipe_proc_fn, 1816 .extra1 = &pipe_min_size, 1817 }, 1818 { 1819 .procname = "pipe-user-pages-hard", 1820 .data = &pipe_user_pages_hard, 1821 .maxlen = sizeof(pipe_user_pages_hard), 1822 .mode = 0644, 1823 .proc_handler = proc_doulongvec_minmax, 1824 }, 1825 { 1826 .procname = "pipe-user-pages-soft", 1827 .data = &pipe_user_pages_soft, 1828 .maxlen = sizeof(pipe_user_pages_soft), 1829 .mode = 0644, 1830 .proc_handler = proc_doulongvec_minmax, 1831 }, 1832 { 1833 .procname = "mount-max", 1834 .data = &sysctl_mount_max, 1835 .maxlen = sizeof(unsigned int), 1836 .mode = 0644, 1837 .proc_handler = proc_dointvec_minmax, 1838 .extra1 = &one, 1839 }, 1840 { } 1841 }; 1842 1843 static struct ctl_table debug_table[] = { 1844 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1845 { 1846 .procname = "exception-trace", 1847 .data = &show_unhandled_signals, 1848 .maxlen = sizeof(int), 1849 .mode = 0644, 1850 .proc_handler = proc_dointvec 1851 }, 1852 #endif 1853 #if defined(CONFIG_OPTPROBES) 1854 { 1855 .procname = "kprobes-optimization", 1856 .data = &sysctl_kprobes_optimization, 1857 .maxlen = sizeof(int), 1858 .mode = 0644, 1859 .proc_handler = proc_kprobes_optimization_handler, 1860 .extra1 = &zero, 1861 .extra2 = &one, 1862 }, 1863 #endif 1864 { } 1865 }; 1866 1867 static struct ctl_table dev_table[] = { 1868 { } 1869 }; 1870 1871 int __init sysctl_init(void) 1872 { 1873 struct ctl_table_header *hdr; 1874 1875 hdr = register_sysctl_table(sysctl_base_table); 1876 kmemleak_not_leak(hdr); 1877 return 0; 1878 } 1879 1880 #endif /* CONFIG_SYSCTL */ 1881 1882 /* 1883 * /proc/sys support 1884 */ 1885 1886 #ifdef CONFIG_PROC_SYSCTL 1887 1888 static int _proc_do_string(char *data, int maxlen, int write, 1889 char __user *buffer, 1890 size_t *lenp, loff_t *ppos) 1891 { 1892 size_t len; 1893 char __user *p; 1894 char c; 1895 1896 if (!data || !maxlen || !*lenp) { 1897 *lenp = 0; 1898 return 0; 1899 } 1900 1901 if (write) { 1902 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1903 /* Only continue writes not past the end of buffer. */ 1904 len = strlen(data); 1905 if (len > maxlen - 1) 1906 len = maxlen - 1; 1907 1908 if (*ppos > len) 1909 return 0; 1910 len = *ppos; 1911 } else { 1912 /* Start writing from beginning of buffer. */ 1913 len = 0; 1914 } 1915 1916 *ppos += *lenp; 1917 p = buffer; 1918 while ((p - buffer) < *lenp && len < maxlen - 1) { 1919 if (get_user(c, p++)) 1920 return -EFAULT; 1921 if (c == 0 || c == '\n') 1922 break; 1923 data[len++] = c; 1924 } 1925 data[len] = 0; 1926 } else { 1927 len = strlen(data); 1928 if (len > maxlen) 1929 len = maxlen; 1930 1931 if (*ppos > len) { 1932 *lenp = 0; 1933 return 0; 1934 } 1935 1936 data += *ppos; 1937 len -= *ppos; 1938 1939 if (len > *lenp) 1940 len = *lenp; 1941 if (len) 1942 if (copy_to_user(buffer, data, len)) 1943 return -EFAULT; 1944 if (len < *lenp) { 1945 if (put_user('\n', buffer + len)) 1946 return -EFAULT; 1947 len++; 1948 } 1949 *lenp = len; 1950 *ppos += len; 1951 } 1952 return 0; 1953 } 1954 1955 static void warn_sysctl_write(struct ctl_table *table) 1956 { 1957 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1958 "This will not be supported in the future. To silence this\n" 1959 "warning, set kernel.sysctl_writes_strict = -1\n", 1960 current->comm, table->procname); 1961 } 1962 1963 /** 1964 * proc_dostring - read a string sysctl 1965 * @table: the sysctl table 1966 * @write: %TRUE if this is a write to the sysctl file 1967 * @buffer: the user buffer 1968 * @lenp: the size of the user buffer 1969 * @ppos: file position 1970 * 1971 * Reads/writes a string from/to the user buffer. If the kernel 1972 * buffer provided is not large enough to hold the string, the 1973 * string is truncated. The copied string is %NULL-terminated. 1974 * If the string is being read by the user process, it is copied 1975 * and a newline '\n' is added. It is truncated if the buffer is 1976 * not large enough. 1977 * 1978 * Returns 0 on success. 1979 */ 1980 int proc_dostring(struct ctl_table *table, int write, 1981 void __user *buffer, size_t *lenp, loff_t *ppos) 1982 { 1983 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) 1984 warn_sysctl_write(table); 1985 1986 return _proc_do_string((char *)(table->data), table->maxlen, write, 1987 (char __user *)buffer, lenp, ppos); 1988 } 1989 1990 static size_t proc_skip_spaces(char **buf) 1991 { 1992 size_t ret; 1993 char *tmp = skip_spaces(*buf); 1994 ret = tmp - *buf; 1995 *buf = tmp; 1996 return ret; 1997 } 1998 1999 static void proc_skip_char(char **buf, size_t *size, const char v) 2000 { 2001 while (*size) { 2002 if (**buf != v) 2003 break; 2004 (*size)--; 2005 (*buf)++; 2006 } 2007 } 2008 2009 #define TMPBUFLEN 22 2010 /** 2011 * proc_get_long - reads an ASCII formatted integer from a user buffer 2012 * 2013 * @buf: a kernel buffer 2014 * @size: size of the kernel buffer 2015 * @val: this is where the number will be stored 2016 * @neg: set to %TRUE if number is negative 2017 * @perm_tr: a vector which contains the allowed trailers 2018 * @perm_tr_len: size of the perm_tr vector 2019 * @tr: pointer to store the trailer character 2020 * 2021 * In case of success %0 is returned and @buf and @size are updated with 2022 * the amount of bytes read. If @tr is non-NULL and a trailing 2023 * character exists (size is non-zero after returning from this 2024 * function), @tr is updated with the trailing character. 2025 */ 2026 static int proc_get_long(char **buf, size_t *size, 2027 unsigned long *val, bool *neg, 2028 const char *perm_tr, unsigned perm_tr_len, char *tr) 2029 { 2030 int len; 2031 char *p, tmp[TMPBUFLEN]; 2032 2033 if (!*size) 2034 return -EINVAL; 2035 2036 len = *size; 2037 if (len > TMPBUFLEN - 1) 2038 len = TMPBUFLEN - 1; 2039 2040 memcpy(tmp, *buf, len); 2041 2042 tmp[len] = 0; 2043 p = tmp; 2044 if (*p == '-' && *size > 1) { 2045 *neg = true; 2046 p++; 2047 } else 2048 *neg = false; 2049 if (!isdigit(*p)) 2050 return -EINVAL; 2051 2052 *val = simple_strtoul(p, &p, 0); 2053 2054 len = p - tmp; 2055 2056 /* We don't know if the next char is whitespace thus we may accept 2057 * invalid integers (e.g. 1234...a) or two integers instead of one 2058 * (e.g. 123...1). So lets not allow such large numbers. */ 2059 if (len == TMPBUFLEN - 1) 2060 return -EINVAL; 2061 2062 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2063 return -EINVAL; 2064 2065 if (tr && (len < *size)) 2066 *tr = *p; 2067 2068 *buf += len; 2069 *size -= len; 2070 2071 return 0; 2072 } 2073 2074 /** 2075 * proc_put_long - converts an integer to a decimal ASCII formatted string 2076 * 2077 * @buf: the user buffer 2078 * @size: the size of the user buffer 2079 * @val: the integer to be converted 2080 * @neg: sign of the number, %TRUE for negative 2081 * 2082 * In case of success %0 is returned and @buf and @size are updated with 2083 * the amount of bytes written. 2084 */ 2085 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2086 bool neg) 2087 { 2088 int len; 2089 char tmp[TMPBUFLEN], *p = tmp; 2090 2091 sprintf(p, "%s%lu", neg ? "-" : "", val); 2092 len = strlen(tmp); 2093 if (len > *size) 2094 len = *size; 2095 if (copy_to_user(*buf, tmp, len)) 2096 return -EFAULT; 2097 *size -= len; 2098 *buf += len; 2099 return 0; 2100 } 2101 #undef TMPBUFLEN 2102 2103 static int proc_put_char(void __user **buf, size_t *size, char c) 2104 { 2105 if (*size) { 2106 char __user **buffer = (char __user **)buf; 2107 if (put_user(c, *buffer)) 2108 return -EFAULT; 2109 (*size)--, (*buffer)++; 2110 *buf = *buffer; 2111 } 2112 return 0; 2113 } 2114 2115 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2116 int *valp, 2117 int write, void *data) 2118 { 2119 if (write) { 2120 if (*negp) { 2121 if (*lvalp > (unsigned long) INT_MAX + 1) 2122 return -EINVAL; 2123 *valp = -*lvalp; 2124 } else { 2125 if (*lvalp > (unsigned long) INT_MAX) 2126 return -EINVAL; 2127 *valp = *lvalp; 2128 } 2129 } else { 2130 int val = *valp; 2131 if (val < 0) { 2132 *negp = true; 2133 *lvalp = -(unsigned long)val; 2134 } else { 2135 *negp = false; 2136 *lvalp = (unsigned long)val; 2137 } 2138 } 2139 return 0; 2140 } 2141 2142 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp, 2143 int *valp, 2144 int write, void *data) 2145 { 2146 if (write) { 2147 if (*negp) 2148 return -EINVAL; 2149 *valp = *lvalp; 2150 } else { 2151 unsigned int val = *valp; 2152 *lvalp = (unsigned long)val; 2153 } 2154 return 0; 2155 } 2156 2157 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2158 2159 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2160 int write, void __user *buffer, 2161 size_t *lenp, loff_t *ppos, 2162 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2163 int write, void *data), 2164 void *data) 2165 { 2166 int *i, vleft, first = 1, err = 0; 2167 size_t left; 2168 char *kbuf = NULL, *p; 2169 2170 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2171 *lenp = 0; 2172 return 0; 2173 } 2174 2175 i = (int *) tbl_data; 2176 vleft = table->maxlen / sizeof(*i); 2177 left = *lenp; 2178 2179 if (!conv) 2180 conv = do_proc_dointvec_conv; 2181 2182 if (write) { 2183 if (*ppos) { 2184 switch (sysctl_writes_strict) { 2185 case SYSCTL_WRITES_STRICT: 2186 goto out; 2187 case SYSCTL_WRITES_WARN: 2188 warn_sysctl_write(table); 2189 break; 2190 default: 2191 break; 2192 } 2193 } 2194 2195 if (left > PAGE_SIZE - 1) 2196 left = PAGE_SIZE - 1; 2197 p = kbuf = memdup_user_nul(buffer, left); 2198 if (IS_ERR(kbuf)) 2199 return PTR_ERR(kbuf); 2200 } 2201 2202 for (; left && vleft--; i++, first=0) { 2203 unsigned long lval; 2204 bool neg; 2205 2206 if (write) { 2207 left -= proc_skip_spaces(&p); 2208 2209 if (!left) 2210 break; 2211 err = proc_get_long(&p, &left, &lval, &neg, 2212 proc_wspace_sep, 2213 sizeof(proc_wspace_sep), NULL); 2214 if (err) 2215 break; 2216 if (conv(&neg, &lval, i, 1, data)) { 2217 err = -EINVAL; 2218 break; 2219 } 2220 } else { 2221 if (conv(&neg, &lval, i, 0, data)) { 2222 err = -EINVAL; 2223 break; 2224 } 2225 if (!first) 2226 err = proc_put_char(&buffer, &left, '\t'); 2227 if (err) 2228 break; 2229 err = proc_put_long(&buffer, &left, lval, neg); 2230 if (err) 2231 break; 2232 } 2233 } 2234 2235 if (!write && !first && left && !err) 2236 err = proc_put_char(&buffer, &left, '\n'); 2237 if (write && !err && left) 2238 left -= proc_skip_spaces(&p); 2239 if (write) { 2240 kfree(kbuf); 2241 if (first) 2242 return err ? : -EINVAL; 2243 } 2244 *lenp -= left; 2245 out: 2246 *ppos += *lenp; 2247 return err; 2248 } 2249 2250 static int do_proc_dointvec(struct ctl_table *table, int write, 2251 void __user *buffer, size_t *lenp, loff_t *ppos, 2252 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2253 int write, void *data), 2254 void *data) 2255 { 2256 return __do_proc_dointvec(table->data, table, write, 2257 buffer, lenp, ppos, conv, data); 2258 } 2259 2260 /** 2261 * proc_dointvec - read a vector of integers 2262 * @table: the sysctl table 2263 * @write: %TRUE if this is a write to the sysctl file 2264 * @buffer: the user buffer 2265 * @lenp: the size of the user buffer 2266 * @ppos: file position 2267 * 2268 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2269 * values from/to the user buffer, treated as an ASCII string. 2270 * 2271 * Returns 0 on success. 2272 */ 2273 int proc_dointvec(struct ctl_table *table, int write, 2274 void __user *buffer, size_t *lenp, loff_t *ppos) 2275 { 2276 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2277 } 2278 2279 /** 2280 * proc_douintvec - read a vector of unsigned integers 2281 * @table: the sysctl table 2282 * @write: %TRUE if this is a write to the sysctl file 2283 * @buffer: the user buffer 2284 * @lenp: the size of the user buffer 2285 * @ppos: file position 2286 * 2287 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2288 * values from/to the user buffer, treated as an ASCII string. 2289 * 2290 * Returns 0 on success. 2291 */ 2292 int proc_douintvec(struct ctl_table *table, int write, 2293 void __user *buffer, size_t *lenp, loff_t *ppos) 2294 { 2295 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2296 do_proc_douintvec_conv, NULL); 2297 } 2298 2299 /* 2300 * Taint values can only be increased 2301 * This means we can safely use a temporary. 2302 */ 2303 static int proc_taint(struct ctl_table *table, int write, 2304 void __user *buffer, size_t *lenp, loff_t *ppos) 2305 { 2306 struct ctl_table t; 2307 unsigned long tmptaint = get_taint(); 2308 int err; 2309 2310 if (write && !capable(CAP_SYS_ADMIN)) 2311 return -EPERM; 2312 2313 t = *table; 2314 t.data = &tmptaint; 2315 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2316 if (err < 0) 2317 return err; 2318 2319 if (write) { 2320 /* 2321 * Poor man's atomic or. Not worth adding a primitive 2322 * to everyone's atomic.h for this 2323 */ 2324 int i; 2325 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2326 if ((tmptaint >> i) & 1) 2327 add_taint(i, LOCKDEP_STILL_OK); 2328 } 2329 } 2330 2331 return err; 2332 } 2333 2334 #ifdef CONFIG_PRINTK 2335 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2336 void __user *buffer, size_t *lenp, loff_t *ppos) 2337 { 2338 if (write && !capable(CAP_SYS_ADMIN)) 2339 return -EPERM; 2340 2341 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2342 } 2343 #endif 2344 2345 struct do_proc_dointvec_minmax_conv_param { 2346 int *min; 2347 int *max; 2348 }; 2349 2350 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2351 int *valp, 2352 int write, void *data) 2353 { 2354 struct do_proc_dointvec_minmax_conv_param *param = data; 2355 if (write) { 2356 int val = *negp ? -*lvalp : *lvalp; 2357 if ((param->min && *param->min > val) || 2358 (param->max && *param->max < val)) 2359 return -EINVAL; 2360 *valp = val; 2361 } else { 2362 int val = *valp; 2363 if (val < 0) { 2364 *negp = true; 2365 *lvalp = -(unsigned long)val; 2366 } else { 2367 *negp = false; 2368 *lvalp = (unsigned long)val; 2369 } 2370 } 2371 return 0; 2372 } 2373 2374 /** 2375 * proc_dointvec_minmax - read a vector of integers with min/max values 2376 * @table: the sysctl table 2377 * @write: %TRUE if this is a write to the sysctl file 2378 * @buffer: the user buffer 2379 * @lenp: the size of the user buffer 2380 * @ppos: file position 2381 * 2382 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2383 * values from/to the user buffer, treated as an ASCII string. 2384 * 2385 * This routine will ensure the values are within the range specified by 2386 * table->extra1 (min) and table->extra2 (max). 2387 * 2388 * Returns 0 on success. 2389 */ 2390 int proc_dointvec_minmax(struct ctl_table *table, int write, 2391 void __user *buffer, size_t *lenp, loff_t *ppos) 2392 { 2393 struct do_proc_dointvec_minmax_conv_param param = { 2394 .min = (int *) table->extra1, 2395 .max = (int *) table->extra2, 2396 }; 2397 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2398 do_proc_dointvec_minmax_conv, ¶m); 2399 } 2400 2401 static void validate_coredump_safety(void) 2402 { 2403 #ifdef CONFIG_COREDUMP 2404 if (suid_dumpable == SUID_DUMP_ROOT && 2405 core_pattern[0] != '/' && core_pattern[0] != '|') { 2406 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2407 "suid_dumpable=2. Pipe handler or fully qualified "\ 2408 "core dump path required.\n"); 2409 } 2410 #endif 2411 } 2412 2413 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2414 void __user *buffer, size_t *lenp, loff_t *ppos) 2415 { 2416 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2417 if (!error) 2418 validate_coredump_safety(); 2419 return error; 2420 } 2421 2422 #ifdef CONFIG_COREDUMP 2423 static int proc_dostring_coredump(struct ctl_table *table, int write, 2424 void __user *buffer, size_t *lenp, loff_t *ppos) 2425 { 2426 int error = proc_dostring(table, write, buffer, lenp, ppos); 2427 if (!error) 2428 validate_coredump_safety(); 2429 return error; 2430 } 2431 #endif 2432 2433 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2434 void __user *buffer, 2435 size_t *lenp, loff_t *ppos, 2436 unsigned long convmul, 2437 unsigned long convdiv) 2438 { 2439 unsigned long *i, *min, *max; 2440 int vleft, first = 1, err = 0; 2441 size_t left; 2442 char *kbuf = NULL, *p; 2443 2444 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2445 *lenp = 0; 2446 return 0; 2447 } 2448 2449 i = (unsigned long *) data; 2450 min = (unsigned long *) table->extra1; 2451 max = (unsigned long *) table->extra2; 2452 vleft = table->maxlen / sizeof(unsigned long); 2453 left = *lenp; 2454 2455 if (write) { 2456 if (*ppos) { 2457 switch (sysctl_writes_strict) { 2458 case SYSCTL_WRITES_STRICT: 2459 goto out; 2460 case SYSCTL_WRITES_WARN: 2461 warn_sysctl_write(table); 2462 break; 2463 default: 2464 break; 2465 } 2466 } 2467 2468 if (left > PAGE_SIZE - 1) 2469 left = PAGE_SIZE - 1; 2470 p = kbuf = memdup_user_nul(buffer, left); 2471 if (IS_ERR(kbuf)) 2472 return PTR_ERR(kbuf); 2473 } 2474 2475 for (; left && vleft--; i++, first = 0) { 2476 unsigned long val; 2477 2478 if (write) { 2479 bool neg; 2480 2481 left -= proc_skip_spaces(&p); 2482 2483 err = proc_get_long(&p, &left, &val, &neg, 2484 proc_wspace_sep, 2485 sizeof(proc_wspace_sep), NULL); 2486 if (err) 2487 break; 2488 if (neg) 2489 continue; 2490 if ((min && val < *min) || (max && val > *max)) 2491 continue; 2492 *i = val; 2493 } else { 2494 val = convdiv * (*i) / convmul; 2495 if (!first) { 2496 err = proc_put_char(&buffer, &left, '\t'); 2497 if (err) 2498 break; 2499 } 2500 err = proc_put_long(&buffer, &left, val, false); 2501 if (err) 2502 break; 2503 } 2504 } 2505 2506 if (!write && !first && left && !err) 2507 err = proc_put_char(&buffer, &left, '\n'); 2508 if (write && !err) 2509 left -= proc_skip_spaces(&p); 2510 if (write) { 2511 kfree(kbuf); 2512 if (first) 2513 return err ? : -EINVAL; 2514 } 2515 *lenp -= left; 2516 out: 2517 *ppos += *lenp; 2518 return err; 2519 } 2520 2521 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2522 void __user *buffer, 2523 size_t *lenp, loff_t *ppos, 2524 unsigned long convmul, 2525 unsigned long convdiv) 2526 { 2527 return __do_proc_doulongvec_minmax(table->data, table, write, 2528 buffer, lenp, ppos, convmul, convdiv); 2529 } 2530 2531 /** 2532 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2533 * @table: the sysctl table 2534 * @write: %TRUE if this is a write to the sysctl file 2535 * @buffer: the user buffer 2536 * @lenp: the size of the user buffer 2537 * @ppos: file position 2538 * 2539 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2540 * values from/to the user buffer, treated as an ASCII string. 2541 * 2542 * This routine will ensure the values are within the range specified by 2543 * table->extra1 (min) and table->extra2 (max). 2544 * 2545 * Returns 0 on success. 2546 */ 2547 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2548 void __user *buffer, size_t *lenp, loff_t *ppos) 2549 { 2550 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2551 } 2552 2553 /** 2554 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2555 * @table: the sysctl table 2556 * @write: %TRUE if this is a write to the sysctl file 2557 * @buffer: the user buffer 2558 * @lenp: the size of the user buffer 2559 * @ppos: file position 2560 * 2561 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2562 * values from/to the user buffer, treated as an ASCII string. The values 2563 * are treated as milliseconds, and converted to jiffies when they are stored. 2564 * 2565 * This routine will ensure the values are within the range specified by 2566 * table->extra1 (min) and table->extra2 (max). 2567 * 2568 * Returns 0 on success. 2569 */ 2570 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2571 void __user *buffer, 2572 size_t *lenp, loff_t *ppos) 2573 { 2574 return do_proc_doulongvec_minmax(table, write, buffer, 2575 lenp, ppos, HZ, 1000l); 2576 } 2577 2578 2579 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2580 int *valp, 2581 int write, void *data) 2582 { 2583 if (write) { 2584 if (*lvalp > LONG_MAX / HZ) 2585 return 1; 2586 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2587 } else { 2588 int val = *valp; 2589 unsigned long lval; 2590 if (val < 0) { 2591 *negp = true; 2592 lval = -(unsigned long)val; 2593 } else { 2594 *negp = false; 2595 lval = (unsigned long)val; 2596 } 2597 *lvalp = lval / HZ; 2598 } 2599 return 0; 2600 } 2601 2602 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2603 int *valp, 2604 int write, void *data) 2605 { 2606 if (write) { 2607 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2608 return 1; 2609 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2610 } else { 2611 int val = *valp; 2612 unsigned long lval; 2613 if (val < 0) { 2614 *negp = true; 2615 lval = -(unsigned long)val; 2616 } else { 2617 *negp = false; 2618 lval = (unsigned long)val; 2619 } 2620 *lvalp = jiffies_to_clock_t(lval); 2621 } 2622 return 0; 2623 } 2624 2625 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2626 int *valp, 2627 int write, void *data) 2628 { 2629 if (write) { 2630 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2631 2632 if (jif > INT_MAX) 2633 return 1; 2634 *valp = (int)jif; 2635 } else { 2636 int val = *valp; 2637 unsigned long lval; 2638 if (val < 0) { 2639 *negp = true; 2640 lval = -(unsigned long)val; 2641 } else { 2642 *negp = false; 2643 lval = (unsigned long)val; 2644 } 2645 *lvalp = jiffies_to_msecs(lval); 2646 } 2647 return 0; 2648 } 2649 2650 /** 2651 * proc_dointvec_jiffies - read a vector of integers as seconds 2652 * @table: the sysctl table 2653 * @write: %TRUE if this is a write to the sysctl file 2654 * @buffer: the user buffer 2655 * @lenp: the size of the user buffer 2656 * @ppos: file position 2657 * 2658 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2659 * values from/to the user buffer, treated as an ASCII string. 2660 * The values read are assumed to be in seconds, and are converted into 2661 * jiffies. 2662 * 2663 * Returns 0 on success. 2664 */ 2665 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2666 void __user *buffer, size_t *lenp, loff_t *ppos) 2667 { 2668 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2669 do_proc_dointvec_jiffies_conv,NULL); 2670 } 2671 2672 /** 2673 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2674 * @table: the sysctl table 2675 * @write: %TRUE if this is a write to the sysctl file 2676 * @buffer: the user buffer 2677 * @lenp: the size of the user buffer 2678 * @ppos: pointer to the file position 2679 * 2680 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2681 * values from/to the user buffer, treated as an ASCII string. 2682 * The values read are assumed to be in 1/USER_HZ seconds, and 2683 * are converted into jiffies. 2684 * 2685 * Returns 0 on success. 2686 */ 2687 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2688 void __user *buffer, size_t *lenp, loff_t *ppos) 2689 { 2690 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2691 do_proc_dointvec_userhz_jiffies_conv,NULL); 2692 } 2693 2694 /** 2695 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2696 * @table: the sysctl table 2697 * @write: %TRUE if this is a write to the sysctl file 2698 * @buffer: the user buffer 2699 * @lenp: the size of the user buffer 2700 * @ppos: file position 2701 * @ppos: the current position in the file 2702 * 2703 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2704 * values from/to the user buffer, treated as an ASCII string. 2705 * The values read are assumed to be in 1/1000 seconds, and 2706 * are converted into jiffies. 2707 * 2708 * Returns 0 on success. 2709 */ 2710 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2711 void __user *buffer, size_t *lenp, loff_t *ppos) 2712 { 2713 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2714 do_proc_dointvec_ms_jiffies_conv, NULL); 2715 } 2716 2717 static int proc_do_cad_pid(struct ctl_table *table, int write, 2718 void __user *buffer, size_t *lenp, loff_t *ppos) 2719 { 2720 struct pid *new_pid; 2721 pid_t tmp; 2722 int r; 2723 2724 tmp = pid_vnr(cad_pid); 2725 2726 r = __do_proc_dointvec(&tmp, table, write, buffer, 2727 lenp, ppos, NULL, NULL); 2728 if (r || !write) 2729 return r; 2730 2731 new_pid = find_get_pid(tmp); 2732 if (!new_pid) 2733 return -ESRCH; 2734 2735 put_pid(xchg(&cad_pid, new_pid)); 2736 return 0; 2737 } 2738 2739 /** 2740 * proc_do_large_bitmap - read/write from/to a large bitmap 2741 * @table: the sysctl table 2742 * @write: %TRUE if this is a write to the sysctl file 2743 * @buffer: the user buffer 2744 * @lenp: the size of the user buffer 2745 * @ppos: file position 2746 * 2747 * The bitmap is stored at table->data and the bitmap length (in bits) 2748 * in table->maxlen. 2749 * 2750 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2751 * large bitmaps may be represented in a compact manner. Writing into 2752 * the file will clear the bitmap then update it with the given input. 2753 * 2754 * Returns 0 on success. 2755 */ 2756 int proc_do_large_bitmap(struct ctl_table *table, int write, 2757 void __user *buffer, size_t *lenp, loff_t *ppos) 2758 { 2759 int err = 0; 2760 bool first = 1; 2761 size_t left = *lenp; 2762 unsigned long bitmap_len = table->maxlen; 2763 unsigned long *bitmap = *(unsigned long **) table->data; 2764 unsigned long *tmp_bitmap = NULL; 2765 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2766 2767 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2768 *lenp = 0; 2769 return 0; 2770 } 2771 2772 if (write) { 2773 char *kbuf, *p; 2774 2775 if (left > PAGE_SIZE - 1) 2776 left = PAGE_SIZE - 1; 2777 2778 p = kbuf = memdup_user_nul(buffer, left); 2779 if (IS_ERR(kbuf)) 2780 return PTR_ERR(kbuf); 2781 2782 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2783 GFP_KERNEL); 2784 if (!tmp_bitmap) { 2785 kfree(kbuf); 2786 return -ENOMEM; 2787 } 2788 proc_skip_char(&p, &left, '\n'); 2789 while (!err && left) { 2790 unsigned long val_a, val_b; 2791 bool neg; 2792 2793 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 2794 sizeof(tr_a), &c); 2795 if (err) 2796 break; 2797 if (val_a >= bitmap_len || neg) { 2798 err = -EINVAL; 2799 break; 2800 } 2801 2802 val_b = val_a; 2803 if (left) { 2804 p++; 2805 left--; 2806 } 2807 2808 if (c == '-') { 2809 err = proc_get_long(&p, &left, &val_b, 2810 &neg, tr_b, sizeof(tr_b), 2811 &c); 2812 if (err) 2813 break; 2814 if (val_b >= bitmap_len || neg || 2815 val_a > val_b) { 2816 err = -EINVAL; 2817 break; 2818 } 2819 if (left) { 2820 p++; 2821 left--; 2822 } 2823 } 2824 2825 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2826 first = 0; 2827 proc_skip_char(&p, &left, '\n'); 2828 } 2829 kfree(kbuf); 2830 } else { 2831 unsigned long bit_a, bit_b = 0; 2832 2833 while (left) { 2834 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2835 if (bit_a >= bitmap_len) 2836 break; 2837 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2838 bit_a + 1) - 1; 2839 2840 if (!first) { 2841 err = proc_put_char(&buffer, &left, ','); 2842 if (err) 2843 break; 2844 } 2845 err = proc_put_long(&buffer, &left, bit_a, false); 2846 if (err) 2847 break; 2848 if (bit_a != bit_b) { 2849 err = proc_put_char(&buffer, &left, '-'); 2850 if (err) 2851 break; 2852 err = proc_put_long(&buffer, &left, bit_b, false); 2853 if (err) 2854 break; 2855 } 2856 2857 first = 0; bit_b++; 2858 } 2859 if (!err) 2860 err = proc_put_char(&buffer, &left, '\n'); 2861 } 2862 2863 if (!err) { 2864 if (write) { 2865 if (*ppos) 2866 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2867 else 2868 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2869 } 2870 kfree(tmp_bitmap); 2871 *lenp -= left; 2872 *ppos += *lenp; 2873 return 0; 2874 } else { 2875 kfree(tmp_bitmap); 2876 return err; 2877 } 2878 } 2879 2880 #else /* CONFIG_PROC_SYSCTL */ 2881 2882 int proc_dostring(struct ctl_table *table, int write, 2883 void __user *buffer, size_t *lenp, loff_t *ppos) 2884 { 2885 return -ENOSYS; 2886 } 2887 2888 int proc_dointvec(struct ctl_table *table, int write, 2889 void __user *buffer, size_t *lenp, loff_t *ppos) 2890 { 2891 return -ENOSYS; 2892 } 2893 2894 int proc_douintvec(struct ctl_table *table, int write, 2895 void __user *buffer, size_t *lenp, loff_t *ppos) 2896 { 2897 return -ENOSYS; 2898 } 2899 2900 int proc_dointvec_minmax(struct ctl_table *table, int write, 2901 void __user *buffer, size_t *lenp, loff_t *ppos) 2902 { 2903 return -ENOSYS; 2904 } 2905 2906 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2907 void __user *buffer, size_t *lenp, loff_t *ppos) 2908 { 2909 return -ENOSYS; 2910 } 2911 2912 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2913 void __user *buffer, size_t *lenp, loff_t *ppos) 2914 { 2915 return -ENOSYS; 2916 } 2917 2918 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2919 void __user *buffer, size_t *lenp, loff_t *ppos) 2920 { 2921 return -ENOSYS; 2922 } 2923 2924 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2925 void __user *buffer, size_t *lenp, loff_t *ppos) 2926 { 2927 return -ENOSYS; 2928 } 2929 2930 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2931 void __user *buffer, 2932 size_t *lenp, loff_t *ppos) 2933 { 2934 return -ENOSYS; 2935 } 2936 2937 2938 #endif /* CONFIG_PROC_SYSCTL */ 2939 2940 /* 2941 * No sense putting this after each symbol definition, twice, 2942 * exception granted :-) 2943 */ 2944 EXPORT_SYMBOL(proc_dointvec); 2945 EXPORT_SYMBOL(proc_douintvec); 2946 EXPORT_SYMBOL(proc_dointvec_jiffies); 2947 EXPORT_SYMBOL(proc_dointvec_minmax); 2948 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2949 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2950 EXPORT_SYMBOL(proc_dostring); 2951 EXPORT_SYMBOL(proc_doulongvec_minmax); 2952 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2953