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/signal.h> 27 #include <linux/printk.h> 28 #include <linux/proc_fs.h> 29 #include <linux/security.h> 30 #include <linux/ctype.h> 31 #include <linux/kmemcheck.h> 32 #include <linux/fs.h> 33 #include <linux/init.h> 34 #include <linux/kernel.h> 35 #include <linux/kobject.h> 36 #include <linux/net.h> 37 #include <linux/sysrq.h> 38 #include <linux/highuid.h> 39 #include <linux/writeback.h> 40 #include <linux/ratelimit.h> 41 #include <linux/compaction.h> 42 #include <linux/hugetlb.h> 43 #include <linux/initrd.h> 44 #include <linux/key.h> 45 #include <linux/times.h> 46 #include <linux/limits.h> 47 #include <linux/dcache.h> 48 #include <linux/dnotify.h> 49 #include <linux/syscalls.h> 50 #include <linux/vmstat.h> 51 #include <linux/nfs_fs.h> 52 #include <linux/acpi.h> 53 #include <linux/reboot.h> 54 #include <linux/ftrace.h> 55 #include <linux/perf_event.h> 56 #include <linux/kprobes.h> 57 #include <linux/pipe_fs_i.h> 58 #include <linux/oom.h> 59 #include <linux/kmod.h> 60 #include <linux/capability.h> 61 #include <linux/binfmts.h> 62 63 #include <asm/uaccess.h> 64 #include <asm/processor.h> 65 66 #ifdef CONFIG_X86 67 #include <asm/nmi.h> 68 #include <asm/stacktrace.h> 69 #include <asm/io.h> 70 #endif 71 #ifdef CONFIG_BSD_PROCESS_ACCT 72 #include <linux/acct.h> 73 #endif 74 #ifdef CONFIG_RT_MUTEXES 75 #include <linux/rtmutex.h> 76 #endif 77 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 78 #include <linux/lockdep.h> 79 #endif 80 #ifdef CONFIG_CHR_DEV_SG 81 #include <scsi/sg.h> 82 #endif 83 84 #ifdef CONFIG_LOCKUP_DETECTOR 85 #include <linux/nmi.h> 86 #endif 87 88 89 #if defined(CONFIG_SYSCTL) 90 91 /* External variables not in a header file. */ 92 extern int sysctl_overcommit_memory; 93 extern int sysctl_overcommit_ratio; 94 extern int max_threads; 95 extern int core_uses_pid; 96 extern int suid_dumpable; 97 extern char core_pattern[]; 98 extern unsigned int core_pipe_limit; 99 extern int pid_max; 100 extern int min_free_kbytes; 101 extern int pid_max_min, pid_max_max; 102 extern int sysctl_drop_caches; 103 extern int percpu_pagelist_fraction; 104 extern int compat_log; 105 extern int latencytop_enabled; 106 extern int sysctl_nr_open_min, sysctl_nr_open_max; 107 #ifndef CONFIG_MMU 108 extern int sysctl_nr_trim_pages; 109 #endif 110 #ifdef CONFIG_BLOCK 111 extern int blk_iopoll_enabled; 112 #endif 113 114 /* Constants used for minimum and maximum */ 115 #ifdef CONFIG_LOCKUP_DETECTOR 116 static int sixty = 60; 117 static int neg_one = -1; 118 #endif 119 120 static int zero; 121 static int __maybe_unused one = 1; 122 static int __maybe_unused two = 2; 123 static int __maybe_unused three = 3; 124 static unsigned long one_ul = 1; 125 static int one_hundred = 100; 126 #ifdef CONFIG_PRINTK 127 static int ten_thousand = 10000; 128 #endif 129 130 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 131 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 132 133 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 134 static int maxolduid = 65535; 135 static int minolduid; 136 static int min_percpu_pagelist_fract = 8; 137 138 static int ngroups_max = NGROUPS_MAX; 139 static const int cap_last_cap = CAP_LAST_CAP; 140 141 #ifdef CONFIG_INOTIFY_USER 142 #include <linux/inotify.h> 143 #endif 144 #ifdef CONFIG_SPARC 145 #include <asm/system.h> 146 #endif 147 148 #ifdef CONFIG_SPARC64 149 extern int sysctl_tsb_ratio; 150 #endif 151 152 #ifdef __hppa__ 153 extern int pwrsw_enabled; 154 extern int unaligned_enabled; 155 #endif 156 157 #ifdef CONFIG_IA64 158 extern int no_unaligned_warning; 159 extern int unaligned_dump_stack; 160 #endif 161 162 #ifdef CONFIG_PROC_SYSCTL 163 static int proc_do_cad_pid(struct ctl_table *table, int write, 164 void __user *buffer, size_t *lenp, loff_t *ppos); 165 static int proc_taint(struct ctl_table *table, int write, 166 void __user *buffer, size_t *lenp, loff_t *ppos); 167 #endif 168 169 #ifdef CONFIG_PRINTK 170 static int proc_dmesg_restrict(struct ctl_table *table, int write, 171 void __user *buffer, size_t *lenp, loff_t *ppos); 172 #endif 173 174 #ifdef CONFIG_MAGIC_SYSRQ 175 /* Note: sysrq code uses it's own private copy */ 176 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 177 178 static int sysrq_sysctl_handler(ctl_table *table, int write, 179 void __user *buffer, size_t *lenp, 180 loff_t *ppos) 181 { 182 int error; 183 184 error = proc_dointvec(table, write, buffer, lenp, ppos); 185 if (error) 186 return error; 187 188 if (write) 189 sysrq_toggle_support(__sysrq_enabled); 190 191 return 0; 192 } 193 194 #endif 195 196 static struct ctl_table root_table[]; 197 static struct ctl_table_root sysctl_table_root; 198 static struct ctl_table_header root_table_header = { 199 {{.count = 1, 200 .ctl_table = root_table, 201 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, 202 .root = &sysctl_table_root, 203 .set = &sysctl_table_root.default_set, 204 }; 205 static struct ctl_table_root sysctl_table_root = { 206 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 207 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 208 }; 209 210 static struct ctl_table kern_table[]; 211 static struct ctl_table vm_table[]; 212 static struct ctl_table fs_table[]; 213 static struct ctl_table debug_table[]; 214 static struct ctl_table dev_table[]; 215 extern struct ctl_table random_table[]; 216 #ifdef CONFIG_EPOLL 217 extern struct ctl_table epoll_table[]; 218 #endif 219 220 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 221 int sysctl_legacy_va_layout; 222 #endif 223 224 /* The default sysctl tables: */ 225 226 static struct ctl_table root_table[] = { 227 { 228 .procname = "kernel", 229 .mode = 0555, 230 .child = kern_table, 231 }, 232 { 233 .procname = "vm", 234 .mode = 0555, 235 .child = vm_table, 236 }, 237 { 238 .procname = "fs", 239 .mode = 0555, 240 .child = fs_table, 241 }, 242 { 243 .procname = "debug", 244 .mode = 0555, 245 .child = debug_table, 246 }, 247 { 248 .procname = "dev", 249 .mode = 0555, 250 .child = dev_table, 251 }, 252 { } 253 }; 254 255 #ifdef CONFIG_SCHED_DEBUG 256 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 257 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 258 static int min_wakeup_granularity_ns; /* 0 usecs */ 259 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 260 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 261 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 262 #endif 263 264 #ifdef CONFIG_COMPACTION 265 static int min_extfrag_threshold; 266 static int max_extfrag_threshold = 1000; 267 #endif 268 269 static struct ctl_table kern_table[] = { 270 { 271 .procname = "sched_child_runs_first", 272 .data = &sysctl_sched_child_runs_first, 273 .maxlen = sizeof(unsigned int), 274 .mode = 0644, 275 .proc_handler = proc_dointvec, 276 }, 277 #ifdef CONFIG_SCHED_DEBUG 278 { 279 .procname = "sched_min_granularity_ns", 280 .data = &sysctl_sched_min_granularity, 281 .maxlen = sizeof(unsigned int), 282 .mode = 0644, 283 .proc_handler = sched_proc_update_handler, 284 .extra1 = &min_sched_granularity_ns, 285 .extra2 = &max_sched_granularity_ns, 286 }, 287 { 288 .procname = "sched_latency_ns", 289 .data = &sysctl_sched_latency, 290 .maxlen = sizeof(unsigned int), 291 .mode = 0644, 292 .proc_handler = sched_proc_update_handler, 293 .extra1 = &min_sched_granularity_ns, 294 .extra2 = &max_sched_granularity_ns, 295 }, 296 { 297 .procname = "sched_wakeup_granularity_ns", 298 .data = &sysctl_sched_wakeup_granularity, 299 .maxlen = sizeof(unsigned int), 300 .mode = 0644, 301 .proc_handler = sched_proc_update_handler, 302 .extra1 = &min_wakeup_granularity_ns, 303 .extra2 = &max_wakeup_granularity_ns, 304 }, 305 { 306 .procname = "sched_tunable_scaling", 307 .data = &sysctl_sched_tunable_scaling, 308 .maxlen = sizeof(enum sched_tunable_scaling), 309 .mode = 0644, 310 .proc_handler = sched_proc_update_handler, 311 .extra1 = &min_sched_tunable_scaling, 312 .extra2 = &max_sched_tunable_scaling, 313 }, 314 { 315 .procname = "sched_migration_cost", 316 .data = &sysctl_sched_migration_cost, 317 .maxlen = sizeof(unsigned int), 318 .mode = 0644, 319 .proc_handler = proc_dointvec, 320 }, 321 { 322 .procname = "sched_nr_migrate", 323 .data = &sysctl_sched_nr_migrate, 324 .maxlen = sizeof(unsigned int), 325 .mode = 0644, 326 .proc_handler = proc_dointvec, 327 }, 328 { 329 .procname = "sched_time_avg", 330 .data = &sysctl_sched_time_avg, 331 .maxlen = sizeof(unsigned int), 332 .mode = 0644, 333 .proc_handler = proc_dointvec, 334 }, 335 { 336 .procname = "sched_shares_window", 337 .data = &sysctl_sched_shares_window, 338 .maxlen = sizeof(unsigned int), 339 .mode = 0644, 340 .proc_handler = proc_dointvec, 341 }, 342 { 343 .procname = "timer_migration", 344 .data = &sysctl_timer_migration, 345 .maxlen = sizeof(unsigned int), 346 .mode = 0644, 347 .proc_handler = proc_dointvec_minmax, 348 .extra1 = &zero, 349 .extra2 = &one, 350 }, 351 #endif 352 { 353 .procname = "sched_rt_period_us", 354 .data = &sysctl_sched_rt_period, 355 .maxlen = sizeof(unsigned int), 356 .mode = 0644, 357 .proc_handler = sched_rt_handler, 358 }, 359 { 360 .procname = "sched_rt_runtime_us", 361 .data = &sysctl_sched_rt_runtime, 362 .maxlen = sizeof(int), 363 .mode = 0644, 364 .proc_handler = sched_rt_handler, 365 }, 366 #ifdef CONFIG_SCHED_AUTOGROUP 367 { 368 .procname = "sched_autogroup_enabled", 369 .data = &sysctl_sched_autogroup_enabled, 370 .maxlen = sizeof(unsigned int), 371 .mode = 0644, 372 .proc_handler = proc_dointvec_minmax, 373 .extra1 = &zero, 374 .extra2 = &one, 375 }, 376 #endif 377 #ifdef CONFIG_CFS_BANDWIDTH 378 { 379 .procname = "sched_cfs_bandwidth_slice_us", 380 .data = &sysctl_sched_cfs_bandwidth_slice, 381 .maxlen = sizeof(unsigned int), 382 .mode = 0644, 383 .proc_handler = proc_dointvec_minmax, 384 .extra1 = &one, 385 }, 386 #endif 387 #ifdef CONFIG_PROVE_LOCKING 388 { 389 .procname = "prove_locking", 390 .data = &prove_locking, 391 .maxlen = sizeof(int), 392 .mode = 0644, 393 .proc_handler = proc_dointvec, 394 }, 395 #endif 396 #ifdef CONFIG_LOCK_STAT 397 { 398 .procname = "lock_stat", 399 .data = &lock_stat, 400 .maxlen = sizeof(int), 401 .mode = 0644, 402 .proc_handler = proc_dointvec, 403 }, 404 #endif 405 { 406 .procname = "panic", 407 .data = &panic_timeout, 408 .maxlen = sizeof(int), 409 .mode = 0644, 410 .proc_handler = proc_dointvec, 411 }, 412 { 413 .procname = "core_uses_pid", 414 .data = &core_uses_pid, 415 .maxlen = sizeof(int), 416 .mode = 0644, 417 .proc_handler = proc_dointvec, 418 }, 419 { 420 .procname = "core_pattern", 421 .data = core_pattern, 422 .maxlen = CORENAME_MAX_SIZE, 423 .mode = 0644, 424 .proc_handler = proc_dostring, 425 }, 426 { 427 .procname = "core_pipe_limit", 428 .data = &core_pipe_limit, 429 .maxlen = sizeof(unsigned int), 430 .mode = 0644, 431 .proc_handler = proc_dointvec, 432 }, 433 #ifdef CONFIG_PROC_SYSCTL 434 { 435 .procname = "tainted", 436 .maxlen = sizeof(long), 437 .mode = 0644, 438 .proc_handler = proc_taint, 439 }, 440 #endif 441 #ifdef CONFIG_LATENCYTOP 442 { 443 .procname = "latencytop", 444 .data = &latencytop_enabled, 445 .maxlen = sizeof(int), 446 .mode = 0644, 447 .proc_handler = proc_dointvec, 448 }, 449 #endif 450 #ifdef CONFIG_BLK_DEV_INITRD 451 { 452 .procname = "real-root-dev", 453 .data = &real_root_dev, 454 .maxlen = sizeof(int), 455 .mode = 0644, 456 .proc_handler = proc_dointvec, 457 }, 458 #endif 459 { 460 .procname = "print-fatal-signals", 461 .data = &print_fatal_signals, 462 .maxlen = sizeof(int), 463 .mode = 0644, 464 .proc_handler = proc_dointvec, 465 }, 466 #ifdef CONFIG_SPARC 467 { 468 .procname = "reboot-cmd", 469 .data = reboot_command, 470 .maxlen = 256, 471 .mode = 0644, 472 .proc_handler = proc_dostring, 473 }, 474 { 475 .procname = "stop-a", 476 .data = &stop_a_enabled, 477 .maxlen = sizeof (int), 478 .mode = 0644, 479 .proc_handler = proc_dointvec, 480 }, 481 { 482 .procname = "scons-poweroff", 483 .data = &scons_pwroff, 484 .maxlen = sizeof (int), 485 .mode = 0644, 486 .proc_handler = proc_dointvec, 487 }, 488 #endif 489 #ifdef CONFIG_SPARC64 490 { 491 .procname = "tsb-ratio", 492 .data = &sysctl_tsb_ratio, 493 .maxlen = sizeof (int), 494 .mode = 0644, 495 .proc_handler = proc_dointvec, 496 }, 497 #endif 498 #ifdef __hppa__ 499 { 500 .procname = "soft-power", 501 .data = &pwrsw_enabled, 502 .maxlen = sizeof (int), 503 .mode = 0644, 504 .proc_handler = proc_dointvec, 505 }, 506 { 507 .procname = "unaligned-trap", 508 .data = &unaligned_enabled, 509 .maxlen = sizeof (int), 510 .mode = 0644, 511 .proc_handler = proc_dointvec, 512 }, 513 #endif 514 { 515 .procname = "ctrl-alt-del", 516 .data = &C_A_D, 517 .maxlen = sizeof(int), 518 .mode = 0644, 519 .proc_handler = proc_dointvec, 520 }, 521 #ifdef CONFIG_FUNCTION_TRACER 522 { 523 .procname = "ftrace_enabled", 524 .data = &ftrace_enabled, 525 .maxlen = sizeof(int), 526 .mode = 0644, 527 .proc_handler = ftrace_enable_sysctl, 528 }, 529 #endif 530 #ifdef CONFIG_STACK_TRACER 531 { 532 .procname = "stack_tracer_enabled", 533 .data = &stack_tracer_enabled, 534 .maxlen = sizeof(int), 535 .mode = 0644, 536 .proc_handler = stack_trace_sysctl, 537 }, 538 #endif 539 #ifdef CONFIG_TRACING 540 { 541 .procname = "ftrace_dump_on_oops", 542 .data = &ftrace_dump_on_oops, 543 .maxlen = sizeof(int), 544 .mode = 0644, 545 .proc_handler = proc_dointvec, 546 }, 547 #endif 548 #ifdef CONFIG_MODULES 549 { 550 .procname = "modprobe", 551 .data = &modprobe_path, 552 .maxlen = KMOD_PATH_LEN, 553 .mode = 0644, 554 .proc_handler = proc_dostring, 555 }, 556 { 557 .procname = "modules_disabled", 558 .data = &modules_disabled, 559 .maxlen = sizeof(int), 560 .mode = 0644, 561 /* only handle a transition from default "0" to "1" */ 562 .proc_handler = proc_dointvec_minmax, 563 .extra1 = &one, 564 .extra2 = &one, 565 }, 566 #endif 567 #ifdef CONFIG_HOTPLUG 568 { 569 .procname = "hotplug", 570 .data = &uevent_helper, 571 .maxlen = UEVENT_HELPER_PATH_LEN, 572 .mode = 0644, 573 .proc_handler = proc_dostring, 574 }, 575 #endif 576 #ifdef CONFIG_CHR_DEV_SG 577 { 578 .procname = "sg-big-buff", 579 .data = &sg_big_buff, 580 .maxlen = sizeof (int), 581 .mode = 0444, 582 .proc_handler = proc_dointvec, 583 }, 584 #endif 585 #ifdef CONFIG_BSD_PROCESS_ACCT 586 { 587 .procname = "acct", 588 .data = &acct_parm, 589 .maxlen = 3*sizeof(int), 590 .mode = 0644, 591 .proc_handler = proc_dointvec, 592 }, 593 #endif 594 #ifdef CONFIG_MAGIC_SYSRQ 595 { 596 .procname = "sysrq", 597 .data = &__sysrq_enabled, 598 .maxlen = sizeof (int), 599 .mode = 0644, 600 .proc_handler = sysrq_sysctl_handler, 601 }, 602 #endif 603 #ifdef CONFIG_PROC_SYSCTL 604 { 605 .procname = "cad_pid", 606 .data = NULL, 607 .maxlen = sizeof (int), 608 .mode = 0600, 609 .proc_handler = proc_do_cad_pid, 610 }, 611 #endif 612 { 613 .procname = "threads-max", 614 .data = &max_threads, 615 .maxlen = sizeof(int), 616 .mode = 0644, 617 .proc_handler = proc_dointvec, 618 }, 619 { 620 .procname = "random", 621 .mode = 0555, 622 .child = random_table, 623 }, 624 { 625 .procname = "usermodehelper", 626 .mode = 0555, 627 .child = usermodehelper_table, 628 }, 629 { 630 .procname = "overflowuid", 631 .data = &overflowuid, 632 .maxlen = sizeof(int), 633 .mode = 0644, 634 .proc_handler = proc_dointvec_minmax, 635 .extra1 = &minolduid, 636 .extra2 = &maxolduid, 637 }, 638 { 639 .procname = "overflowgid", 640 .data = &overflowgid, 641 .maxlen = sizeof(int), 642 .mode = 0644, 643 .proc_handler = proc_dointvec_minmax, 644 .extra1 = &minolduid, 645 .extra2 = &maxolduid, 646 }, 647 #ifdef CONFIG_S390 648 #ifdef CONFIG_MATHEMU 649 { 650 .procname = "ieee_emulation_warnings", 651 .data = &sysctl_ieee_emulation_warnings, 652 .maxlen = sizeof(int), 653 .mode = 0644, 654 .proc_handler = proc_dointvec, 655 }, 656 #endif 657 { 658 .procname = "userprocess_debug", 659 .data = &show_unhandled_signals, 660 .maxlen = sizeof(int), 661 .mode = 0644, 662 .proc_handler = proc_dointvec, 663 }, 664 #endif 665 { 666 .procname = "pid_max", 667 .data = &pid_max, 668 .maxlen = sizeof (int), 669 .mode = 0644, 670 .proc_handler = proc_dointvec_minmax, 671 .extra1 = &pid_max_min, 672 .extra2 = &pid_max_max, 673 }, 674 { 675 .procname = "panic_on_oops", 676 .data = &panic_on_oops, 677 .maxlen = sizeof(int), 678 .mode = 0644, 679 .proc_handler = proc_dointvec, 680 }, 681 #if defined CONFIG_PRINTK 682 { 683 .procname = "printk", 684 .data = &console_loglevel, 685 .maxlen = 4*sizeof(int), 686 .mode = 0644, 687 .proc_handler = proc_dointvec, 688 }, 689 { 690 .procname = "printk_ratelimit", 691 .data = &printk_ratelimit_state.interval, 692 .maxlen = sizeof(int), 693 .mode = 0644, 694 .proc_handler = proc_dointvec_jiffies, 695 }, 696 { 697 .procname = "printk_ratelimit_burst", 698 .data = &printk_ratelimit_state.burst, 699 .maxlen = sizeof(int), 700 .mode = 0644, 701 .proc_handler = proc_dointvec, 702 }, 703 { 704 .procname = "printk_delay", 705 .data = &printk_delay_msec, 706 .maxlen = sizeof(int), 707 .mode = 0644, 708 .proc_handler = proc_dointvec_minmax, 709 .extra1 = &zero, 710 .extra2 = &ten_thousand, 711 }, 712 { 713 .procname = "dmesg_restrict", 714 .data = &dmesg_restrict, 715 .maxlen = sizeof(int), 716 .mode = 0644, 717 .proc_handler = proc_dointvec_minmax, 718 .extra1 = &zero, 719 .extra2 = &one, 720 }, 721 { 722 .procname = "kptr_restrict", 723 .data = &kptr_restrict, 724 .maxlen = sizeof(int), 725 .mode = 0644, 726 .proc_handler = proc_dmesg_restrict, 727 .extra1 = &zero, 728 .extra2 = &two, 729 }, 730 #endif 731 { 732 .procname = "ngroups_max", 733 .data = &ngroups_max, 734 .maxlen = sizeof (int), 735 .mode = 0444, 736 .proc_handler = proc_dointvec, 737 }, 738 { 739 .procname = "cap_last_cap", 740 .data = (void *)&cap_last_cap, 741 .maxlen = sizeof(int), 742 .mode = 0444, 743 .proc_handler = proc_dointvec, 744 }, 745 #if defined(CONFIG_LOCKUP_DETECTOR) 746 { 747 .procname = "watchdog", 748 .data = &watchdog_enabled, 749 .maxlen = sizeof (int), 750 .mode = 0644, 751 .proc_handler = proc_dowatchdog, 752 .extra1 = &zero, 753 .extra2 = &one, 754 }, 755 { 756 .procname = "watchdog_thresh", 757 .data = &watchdog_thresh, 758 .maxlen = sizeof(int), 759 .mode = 0644, 760 .proc_handler = proc_dowatchdog, 761 .extra1 = &neg_one, 762 .extra2 = &sixty, 763 }, 764 { 765 .procname = "softlockup_panic", 766 .data = &softlockup_panic, 767 .maxlen = sizeof(int), 768 .mode = 0644, 769 .proc_handler = proc_dointvec_minmax, 770 .extra1 = &zero, 771 .extra2 = &one, 772 }, 773 { 774 .procname = "nmi_watchdog", 775 .data = &watchdog_enabled, 776 .maxlen = sizeof (int), 777 .mode = 0644, 778 .proc_handler = proc_dowatchdog, 779 .extra1 = &zero, 780 .extra2 = &one, 781 }, 782 #endif 783 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 784 { 785 .procname = "unknown_nmi_panic", 786 .data = &unknown_nmi_panic, 787 .maxlen = sizeof (int), 788 .mode = 0644, 789 .proc_handler = proc_dointvec, 790 }, 791 #endif 792 #if defined(CONFIG_X86) 793 { 794 .procname = "panic_on_unrecovered_nmi", 795 .data = &panic_on_unrecovered_nmi, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec, 799 }, 800 { 801 .procname = "panic_on_io_nmi", 802 .data = &panic_on_io_nmi, 803 .maxlen = sizeof(int), 804 .mode = 0644, 805 .proc_handler = proc_dointvec, 806 }, 807 #ifdef CONFIG_DEBUG_STACKOVERFLOW 808 { 809 .procname = "panic_on_stackoverflow", 810 .data = &sysctl_panic_on_stackoverflow, 811 .maxlen = sizeof(int), 812 .mode = 0644, 813 .proc_handler = proc_dointvec, 814 }, 815 #endif 816 { 817 .procname = "bootloader_type", 818 .data = &bootloader_type, 819 .maxlen = sizeof (int), 820 .mode = 0444, 821 .proc_handler = proc_dointvec, 822 }, 823 { 824 .procname = "bootloader_version", 825 .data = &bootloader_version, 826 .maxlen = sizeof (int), 827 .mode = 0444, 828 .proc_handler = proc_dointvec, 829 }, 830 { 831 .procname = "kstack_depth_to_print", 832 .data = &kstack_depth_to_print, 833 .maxlen = sizeof(int), 834 .mode = 0644, 835 .proc_handler = proc_dointvec, 836 }, 837 { 838 .procname = "io_delay_type", 839 .data = &io_delay_type, 840 .maxlen = sizeof(int), 841 .mode = 0644, 842 .proc_handler = proc_dointvec, 843 }, 844 #endif 845 #if defined(CONFIG_MMU) 846 { 847 .procname = "randomize_va_space", 848 .data = &randomize_va_space, 849 .maxlen = sizeof(int), 850 .mode = 0644, 851 .proc_handler = proc_dointvec, 852 }, 853 #endif 854 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 855 { 856 .procname = "spin_retry", 857 .data = &spin_retry, 858 .maxlen = sizeof (int), 859 .mode = 0644, 860 .proc_handler = proc_dointvec, 861 }, 862 #endif 863 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 864 { 865 .procname = "acpi_video_flags", 866 .data = &acpi_realmode_flags, 867 .maxlen = sizeof (unsigned long), 868 .mode = 0644, 869 .proc_handler = proc_doulongvec_minmax, 870 }, 871 #endif 872 #ifdef CONFIG_IA64 873 { 874 .procname = "ignore-unaligned-usertrap", 875 .data = &no_unaligned_warning, 876 .maxlen = sizeof (int), 877 .mode = 0644, 878 .proc_handler = proc_dointvec, 879 }, 880 { 881 .procname = "unaligned-dump-stack", 882 .data = &unaligned_dump_stack, 883 .maxlen = sizeof (int), 884 .mode = 0644, 885 .proc_handler = proc_dointvec, 886 }, 887 #endif 888 #ifdef CONFIG_DETECT_HUNG_TASK 889 { 890 .procname = "hung_task_panic", 891 .data = &sysctl_hung_task_panic, 892 .maxlen = sizeof(int), 893 .mode = 0644, 894 .proc_handler = proc_dointvec_minmax, 895 .extra1 = &zero, 896 .extra2 = &one, 897 }, 898 { 899 .procname = "hung_task_check_count", 900 .data = &sysctl_hung_task_check_count, 901 .maxlen = sizeof(unsigned long), 902 .mode = 0644, 903 .proc_handler = proc_doulongvec_minmax, 904 }, 905 { 906 .procname = "hung_task_timeout_secs", 907 .data = &sysctl_hung_task_timeout_secs, 908 .maxlen = sizeof(unsigned long), 909 .mode = 0644, 910 .proc_handler = proc_dohung_task_timeout_secs, 911 }, 912 { 913 .procname = "hung_task_warnings", 914 .data = &sysctl_hung_task_warnings, 915 .maxlen = sizeof(unsigned long), 916 .mode = 0644, 917 .proc_handler = proc_doulongvec_minmax, 918 }, 919 #endif 920 #ifdef CONFIG_COMPAT 921 { 922 .procname = "compat-log", 923 .data = &compat_log, 924 .maxlen = sizeof (int), 925 .mode = 0644, 926 .proc_handler = proc_dointvec, 927 }, 928 #endif 929 #ifdef CONFIG_RT_MUTEXES 930 { 931 .procname = "max_lock_depth", 932 .data = &max_lock_depth, 933 .maxlen = sizeof(int), 934 .mode = 0644, 935 .proc_handler = proc_dointvec, 936 }, 937 #endif 938 { 939 .procname = "poweroff_cmd", 940 .data = &poweroff_cmd, 941 .maxlen = POWEROFF_CMD_PATH_LEN, 942 .mode = 0644, 943 .proc_handler = proc_dostring, 944 }, 945 #ifdef CONFIG_KEYS 946 { 947 .procname = "keys", 948 .mode = 0555, 949 .child = key_sysctls, 950 }, 951 #endif 952 #ifdef CONFIG_RCU_TORTURE_TEST 953 { 954 .procname = "rcutorture_runnable", 955 .data = &rcutorture_runnable, 956 .maxlen = sizeof(int), 957 .mode = 0644, 958 .proc_handler = proc_dointvec, 959 }, 960 #endif 961 #ifdef CONFIG_PERF_EVENTS 962 /* 963 * User-space scripts rely on the existence of this file 964 * as a feature check for perf_events being enabled. 965 * 966 * So it's an ABI, do not remove! 967 */ 968 { 969 .procname = "perf_event_paranoid", 970 .data = &sysctl_perf_event_paranoid, 971 .maxlen = sizeof(sysctl_perf_event_paranoid), 972 .mode = 0644, 973 .proc_handler = proc_dointvec, 974 }, 975 { 976 .procname = "perf_event_mlock_kb", 977 .data = &sysctl_perf_event_mlock, 978 .maxlen = sizeof(sysctl_perf_event_mlock), 979 .mode = 0644, 980 .proc_handler = proc_dointvec, 981 }, 982 { 983 .procname = "perf_event_max_sample_rate", 984 .data = &sysctl_perf_event_sample_rate, 985 .maxlen = sizeof(sysctl_perf_event_sample_rate), 986 .mode = 0644, 987 .proc_handler = perf_proc_update_handler, 988 }, 989 #endif 990 #ifdef CONFIG_KMEMCHECK 991 { 992 .procname = "kmemcheck", 993 .data = &kmemcheck_enabled, 994 .maxlen = sizeof(int), 995 .mode = 0644, 996 .proc_handler = proc_dointvec, 997 }, 998 #endif 999 #ifdef CONFIG_BLOCK 1000 { 1001 .procname = "blk_iopoll", 1002 .data = &blk_iopoll_enabled, 1003 .maxlen = sizeof(int), 1004 .mode = 0644, 1005 .proc_handler = proc_dointvec, 1006 }, 1007 #endif 1008 { } 1009 }; 1010 1011 static struct ctl_table vm_table[] = { 1012 { 1013 .procname = "overcommit_memory", 1014 .data = &sysctl_overcommit_memory, 1015 .maxlen = sizeof(sysctl_overcommit_memory), 1016 .mode = 0644, 1017 .proc_handler = proc_dointvec_minmax, 1018 .extra1 = &zero, 1019 .extra2 = &two, 1020 }, 1021 { 1022 .procname = "panic_on_oom", 1023 .data = &sysctl_panic_on_oom, 1024 .maxlen = sizeof(sysctl_panic_on_oom), 1025 .mode = 0644, 1026 .proc_handler = proc_dointvec_minmax, 1027 .extra1 = &zero, 1028 .extra2 = &two, 1029 }, 1030 { 1031 .procname = "oom_kill_allocating_task", 1032 .data = &sysctl_oom_kill_allocating_task, 1033 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1034 .mode = 0644, 1035 .proc_handler = proc_dointvec, 1036 }, 1037 { 1038 .procname = "oom_dump_tasks", 1039 .data = &sysctl_oom_dump_tasks, 1040 .maxlen = sizeof(sysctl_oom_dump_tasks), 1041 .mode = 0644, 1042 .proc_handler = proc_dointvec, 1043 }, 1044 { 1045 .procname = "overcommit_ratio", 1046 .data = &sysctl_overcommit_ratio, 1047 .maxlen = sizeof(sysctl_overcommit_ratio), 1048 .mode = 0644, 1049 .proc_handler = proc_dointvec, 1050 }, 1051 { 1052 .procname = "page-cluster", 1053 .data = &page_cluster, 1054 .maxlen = sizeof(int), 1055 .mode = 0644, 1056 .proc_handler = proc_dointvec_minmax, 1057 .extra1 = &zero, 1058 }, 1059 { 1060 .procname = "dirty_background_ratio", 1061 .data = &dirty_background_ratio, 1062 .maxlen = sizeof(dirty_background_ratio), 1063 .mode = 0644, 1064 .proc_handler = dirty_background_ratio_handler, 1065 .extra1 = &zero, 1066 .extra2 = &one_hundred, 1067 }, 1068 { 1069 .procname = "dirty_background_bytes", 1070 .data = &dirty_background_bytes, 1071 .maxlen = sizeof(dirty_background_bytes), 1072 .mode = 0644, 1073 .proc_handler = dirty_background_bytes_handler, 1074 .extra1 = &one_ul, 1075 }, 1076 { 1077 .procname = "dirty_ratio", 1078 .data = &vm_dirty_ratio, 1079 .maxlen = sizeof(vm_dirty_ratio), 1080 .mode = 0644, 1081 .proc_handler = dirty_ratio_handler, 1082 .extra1 = &zero, 1083 .extra2 = &one_hundred, 1084 }, 1085 { 1086 .procname = "dirty_bytes", 1087 .data = &vm_dirty_bytes, 1088 .maxlen = sizeof(vm_dirty_bytes), 1089 .mode = 0644, 1090 .proc_handler = dirty_bytes_handler, 1091 .extra1 = &dirty_bytes_min, 1092 }, 1093 { 1094 .procname = "dirty_writeback_centisecs", 1095 .data = &dirty_writeback_interval, 1096 .maxlen = sizeof(dirty_writeback_interval), 1097 .mode = 0644, 1098 .proc_handler = dirty_writeback_centisecs_handler, 1099 }, 1100 { 1101 .procname = "dirty_expire_centisecs", 1102 .data = &dirty_expire_interval, 1103 .maxlen = sizeof(dirty_expire_interval), 1104 .mode = 0644, 1105 .proc_handler = proc_dointvec_minmax, 1106 .extra1 = &zero, 1107 }, 1108 { 1109 .procname = "nr_pdflush_threads", 1110 .data = &nr_pdflush_threads, 1111 .maxlen = sizeof nr_pdflush_threads, 1112 .mode = 0444 /* read-only*/, 1113 .proc_handler = proc_dointvec, 1114 }, 1115 { 1116 .procname = "swappiness", 1117 .data = &vm_swappiness, 1118 .maxlen = sizeof(vm_swappiness), 1119 .mode = 0644, 1120 .proc_handler = proc_dointvec_minmax, 1121 .extra1 = &zero, 1122 .extra2 = &one_hundred, 1123 }, 1124 #ifdef CONFIG_HUGETLB_PAGE 1125 { 1126 .procname = "nr_hugepages", 1127 .data = NULL, 1128 .maxlen = sizeof(unsigned long), 1129 .mode = 0644, 1130 .proc_handler = hugetlb_sysctl_handler, 1131 .extra1 = (void *)&hugetlb_zero, 1132 .extra2 = (void *)&hugetlb_infinity, 1133 }, 1134 #ifdef CONFIG_NUMA 1135 { 1136 .procname = "nr_hugepages_mempolicy", 1137 .data = NULL, 1138 .maxlen = sizeof(unsigned long), 1139 .mode = 0644, 1140 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1141 .extra1 = (void *)&hugetlb_zero, 1142 .extra2 = (void *)&hugetlb_infinity, 1143 }, 1144 #endif 1145 { 1146 .procname = "hugetlb_shm_group", 1147 .data = &sysctl_hugetlb_shm_group, 1148 .maxlen = sizeof(gid_t), 1149 .mode = 0644, 1150 .proc_handler = proc_dointvec, 1151 }, 1152 { 1153 .procname = "hugepages_treat_as_movable", 1154 .data = &hugepages_treat_as_movable, 1155 .maxlen = sizeof(int), 1156 .mode = 0644, 1157 .proc_handler = hugetlb_treat_movable_handler, 1158 }, 1159 { 1160 .procname = "nr_overcommit_hugepages", 1161 .data = NULL, 1162 .maxlen = sizeof(unsigned long), 1163 .mode = 0644, 1164 .proc_handler = hugetlb_overcommit_handler, 1165 .extra1 = (void *)&hugetlb_zero, 1166 .extra2 = (void *)&hugetlb_infinity, 1167 }, 1168 #endif 1169 { 1170 .procname = "lowmem_reserve_ratio", 1171 .data = &sysctl_lowmem_reserve_ratio, 1172 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1173 .mode = 0644, 1174 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1175 }, 1176 { 1177 .procname = "drop_caches", 1178 .data = &sysctl_drop_caches, 1179 .maxlen = sizeof(int), 1180 .mode = 0644, 1181 .proc_handler = drop_caches_sysctl_handler, 1182 .extra1 = &one, 1183 .extra2 = &three, 1184 }, 1185 #ifdef CONFIG_COMPACTION 1186 { 1187 .procname = "compact_memory", 1188 .data = &sysctl_compact_memory, 1189 .maxlen = sizeof(int), 1190 .mode = 0200, 1191 .proc_handler = sysctl_compaction_handler, 1192 }, 1193 { 1194 .procname = "extfrag_threshold", 1195 .data = &sysctl_extfrag_threshold, 1196 .maxlen = sizeof(int), 1197 .mode = 0644, 1198 .proc_handler = sysctl_extfrag_handler, 1199 .extra1 = &min_extfrag_threshold, 1200 .extra2 = &max_extfrag_threshold, 1201 }, 1202 1203 #endif /* CONFIG_COMPACTION */ 1204 { 1205 .procname = "min_free_kbytes", 1206 .data = &min_free_kbytes, 1207 .maxlen = sizeof(min_free_kbytes), 1208 .mode = 0644, 1209 .proc_handler = min_free_kbytes_sysctl_handler, 1210 .extra1 = &zero, 1211 }, 1212 { 1213 .procname = "percpu_pagelist_fraction", 1214 .data = &percpu_pagelist_fraction, 1215 .maxlen = sizeof(percpu_pagelist_fraction), 1216 .mode = 0644, 1217 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1218 .extra1 = &min_percpu_pagelist_fract, 1219 }, 1220 #ifdef CONFIG_MMU 1221 { 1222 .procname = "max_map_count", 1223 .data = &sysctl_max_map_count, 1224 .maxlen = sizeof(sysctl_max_map_count), 1225 .mode = 0644, 1226 .proc_handler = proc_dointvec_minmax, 1227 .extra1 = &zero, 1228 }, 1229 #else 1230 { 1231 .procname = "nr_trim_pages", 1232 .data = &sysctl_nr_trim_pages, 1233 .maxlen = sizeof(sysctl_nr_trim_pages), 1234 .mode = 0644, 1235 .proc_handler = proc_dointvec_minmax, 1236 .extra1 = &zero, 1237 }, 1238 #endif 1239 { 1240 .procname = "laptop_mode", 1241 .data = &laptop_mode, 1242 .maxlen = sizeof(laptop_mode), 1243 .mode = 0644, 1244 .proc_handler = proc_dointvec_jiffies, 1245 }, 1246 { 1247 .procname = "block_dump", 1248 .data = &block_dump, 1249 .maxlen = sizeof(block_dump), 1250 .mode = 0644, 1251 .proc_handler = proc_dointvec, 1252 .extra1 = &zero, 1253 }, 1254 { 1255 .procname = "vfs_cache_pressure", 1256 .data = &sysctl_vfs_cache_pressure, 1257 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1258 .mode = 0644, 1259 .proc_handler = proc_dointvec, 1260 .extra1 = &zero, 1261 }, 1262 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1263 { 1264 .procname = "legacy_va_layout", 1265 .data = &sysctl_legacy_va_layout, 1266 .maxlen = sizeof(sysctl_legacy_va_layout), 1267 .mode = 0644, 1268 .proc_handler = proc_dointvec, 1269 .extra1 = &zero, 1270 }, 1271 #endif 1272 #ifdef CONFIG_NUMA 1273 { 1274 .procname = "zone_reclaim_mode", 1275 .data = &zone_reclaim_mode, 1276 .maxlen = sizeof(zone_reclaim_mode), 1277 .mode = 0644, 1278 .proc_handler = proc_dointvec, 1279 .extra1 = &zero, 1280 }, 1281 { 1282 .procname = "min_unmapped_ratio", 1283 .data = &sysctl_min_unmapped_ratio, 1284 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1285 .mode = 0644, 1286 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1287 .extra1 = &zero, 1288 .extra2 = &one_hundred, 1289 }, 1290 { 1291 .procname = "min_slab_ratio", 1292 .data = &sysctl_min_slab_ratio, 1293 .maxlen = sizeof(sysctl_min_slab_ratio), 1294 .mode = 0644, 1295 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1296 .extra1 = &zero, 1297 .extra2 = &one_hundred, 1298 }, 1299 #endif 1300 #ifdef CONFIG_SMP 1301 { 1302 .procname = "stat_interval", 1303 .data = &sysctl_stat_interval, 1304 .maxlen = sizeof(sysctl_stat_interval), 1305 .mode = 0644, 1306 .proc_handler = proc_dointvec_jiffies, 1307 }, 1308 #endif 1309 #ifdef CONFIG_MMU 1310 { 1311 .procname = "mmap_min_addr", 1312 .data = &dac_mmap_min_addr, 1313 .maxlen = sizeof(unsigned long), 1314 .mode = 0644, 1315 .proc_handler = mmap_min_addr_handler, 1316 }, 1317 #endif 1318 #ifdef CONFIG_NUMA 1319 { 1320 .procname = "numa_zonelist_order", 1321 .data = &numa_zonelist_order, 1322 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1323 .mode = 0644, 1324 .proc_handler = numa_zonelist_order_handler, 1325 }, 1326 #endif 1327 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1328 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1329 { 1330 .procname = "vdso_enabled", 1331 .data = &vdso_enabled, 1332 .maxlen = sizeof(vdso_enabled), 1333 .mode = 0644, 1334 .proc_handler = proc_dointvec, 1335 .extra1 = &zero, 1336 }, 1337 #endif 1338 #ifdef CONFIG_HIGHMEM 1339 { 1340 .procname = "highmem_is_dirtyable", 1341 .data = &vm_highmem_is_dirtyable, 1342 .maxlen = sizeof(vm_highmem_is_dirtyable), 1343 .mode = 0644, 1344 .proc_handler = proc_dointvec_minmax, 1345 .extra1 = &zero, 1346 .extra2 = &one, 1347 }, 1348 #endif 1349 { 1350 .procname = "scan_unevictable_pages", 1351 .data = &scan_unevictable_pages, 1352 .maxlen = sizeof(scan_unevictable_pages), 1353 .mode = 0644, 1354 .proc_handler = scan_unevictable_handler, 1355 }, 1356 #ifdef CONFIG_MEMORY_FAILURE 1357 { 1358 .procname = "memory_failure_early_kill", 1359 .data = &sysctl_memory_failure_early_kill, 1360 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1361 .mode = 0644, 1362 .proc_handler = proc_dointvec_minmax, 1363 .extra1 = &zero, 1364 .extra2 = &one, 1365 }, 1366 { 1367 .procname = "memory_failure_recovery", 1368 .data = &sysctl_memory_failure_recovery, 1369 .maxlen = sizeof(sysctl_memory_failure_recovery), 1370 .mode = 0644, 1371 .proc_handler = proc_dointvec_minmax, 1372 .extra1 = &zero, 1373 .extra2 = &one, 1374 }, 1375 #endif 1376 { } 1377 }; 1378 1379 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1380 static struct ctl_table binfmt_misc_table[] = { 1381 { } 1382 }; 1383 #endif 1384 1385 static struct ctl_table fs_table[] = { 1386 { 1387 .procname = "inode-nr", 1388 .data = &inodes_stat, 1389 .maxlen = 2*sizeof(int), 1390 .mode = 0444, 1391 .proc_handler = proc_nr_inodes, 1392 }, 1393 { 1394 .procname = "inode-state", 1395 .data = &inodes_stat, 1396 .maxlen = 7*sizeof(int), 1397 .mode = 0444, 1398 .proc_handler = proc_nr_inodes, 1399 }, 1400 { 1401 .procname = "file-nr", 1402 .data = &files_stat, 1403 .maxlen = sizeof(files_stat), 1404 .mode = 0444, 1405 .proc_handler = proc_nr_files, 1406 }, 1407 { 1408 .procname = "file-max", 1409 .data = &files_stat.max_files, 1410 .maxlen = sizeof(files_stat.max_files), 1411 .mode = 0644, 1412 .proc_handler = proc_doulongvec_minmax, 1413 }, 1414 { 1415 .procname = "nr_open", 1416 .data = &sysctl_nr_open, 1417 .maxlen = sizeof(int), 1418 .mode = 0644, 1419 .proc_handler = proc_dointvec_minmax, 1420 .extra1 = &sysctl_nr_open_min, 1421 .extra2 = &sysctl_nr_open_max, 1422 }, 1423 { 1424 .procname = "dentry-state", 1425 .data = &dentry_stat, 1426 .maxlen = 6*sizeof(int), 1427 .mode = 0444, 1428 .proc_handler = proc_nr_dentry, 1429 }, 1430 { 1431 .procname = "overflowuid", 1432 .data = &fs_overflowuid, 1433 .maxlen = sizeof(int), 1434 .mode = 0644, 1435 .proc_handler = proc_dointvec_minmax, 1436 .extra1 = &minolduid, 1437 .extra2 = &maxolduid, 1438 }, 1439 { 1440 .procname = "overflowgid", 1441 .data = &fs_overflowgid, 1442 .maxlen = sizeof(int), 1443 .mode = 0644, 1444 .proc_handler = proc_dointvec_minmax, 1445 .extra1 = &minolduid, 1446 .extra2 = &maxolduid, 1447 }, 1448 #ifdef CONFIG_FILE_LOCKING 1449 { 1450 .procname = "leases-enable", 1451 .data = &leases_enable, 1452 .maxlen = sizeof(int), 1453 .mode = 0644, 1454 .proc_handler = proc_dointvec, 1455 }, 1456 #endif 1457 #ifdef CONFIG_DNOTIFY 1458 { 1459 .procname = "dir-notify-enable", 1460 .data = &dir_notify_enable, 1461 .maxlen = sizeof(int), 1462 .mode = 0644, 1463 .proc_handler = proc_dointvec, 1464 }, 1465 #endif 1466 #ifdef CONFIG_MMU 1467 #ifdef CONFIG_FILE_LOCKING 1468 { 1469 .procname = "lease-break-time", 1470 .data = &lease_break_time, 1471 .maxlen = sizeof(int), 1472 .mode = 0644, 1473 .proc_handler = proc_dointvec, 1474 }, 1475 #endif 1476 #ifdef CONFIG_AIO 1477 { 1478 .procname = "aio-nr", 1479 .data = &aio_nr, 1480 .maxlen = sizeof(aio_nr), 1481 .mode = 0444, 1482 .proc_handler = proc_doulongvec_minmax, 1483 }, 1484 { 1485 .procname = "aio-max-nr", 1486 .data = &aio_max_nr, 1487 .maxlen = sizeof(aio_max_nr), 1488 .mode = 0644, 1489 .proc_handler = proc_doulongvec_minmax, 1490 }, 1491 #endif /* CONFIG_AIO */ 1492 #ifdef CONFIG_INOTIFY_USER 1493 { 1494 .procname = "inotify", 1495 .mode = 0555, 1496 .child = inotify_table, 1497 }, 1498 #endif 1499 #ifdef CONFIG_EPOLL 1500 { 1501 .procname = "epoll", 1502 .mode = 0555, 1503 .child = epoll_table, 1504 }, 1505 #endif 1506 #endif 1507 { 1508 .procname = "suid_dumpable", 1509 .data = &suid_dumpable, 1510 .maxlen = sizeof(int), 1511 .mode = 0644, 1512 .proc_handler = proc_dointvec_minmax, 1513 .extra1 = &zero, 1514 .extra2 = &two, 1515 }, 1516 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1517 { 1518 .procname = "binfmt_misc", 1519 .mode = 0555, 1520 .child = binfmt_misc_table, 1521 }, 1522 #endif 1523 { 1524 .procname = "pipe-max-size", 1525 .data = &pipe_max_size, 1526 .maxlen = sizeof(int), 1527 .mode = 0644, 1528 .proc_handler = &pipe_proc_fn, 1529 .extra1 = &pipe_min_size, 1530 }, 1531 { } 1532 }; 1533 1534 static struct ctl_table debug_table[] = { 1535 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1536 defined(CONFIG_S390) || defined(CONFIG_TILE) 1537 { 1538 .procname = "exception-trace", 1539 .data = &show_unhandled_signals, 1540 .maxlen = sizeof(int), 1541 .mode = 0644, 1542 .proc_handler = proc_dointvec 1543 }, 1544 #endif 1545 #if defined(CONFIG_OPTPROBES) 1546 { 1547 .procname = "kprobes-optimization", 1548 .data = &sysctl_kprobes_optimization, 1549 .maxlen = sizeof(int), 1550 .mode = 0644, 1551 .proc_handler = proc_kprobes_optimization_handler, 1552 .extra1 = &zero, 1553 .extra2 = &one, 1554 }, 1555 #endif 1556 { } 1557 }; 1558 1559 static struct ctl_table dev_table[] = { 1560 { } 1561 }; 1562 1563 static DEFINE_SPINLOCK(sysctl_lock); 1564 1565 /* called under sysctl_lock */ 1566 static int use_table(struct ctl_table_header *p) 1567 { 1568 if (unlikely(p->unregistering)) 1569 return 0; 1570 p->used++; 1571 return 1; 1572 } 1573 1574 /* called under sysctl_lock */ 1575 static void unuse_table(struct ctl_table_header *p) 1576 { 1577 if (!--p->used) 1578 if (unlikely(p->unregistering)) 1579 complete(p->unregistering); 1580 } 1581 1582 /* called under sysctl_lock, will reacquire if has to wait */ 1583 static void start_unregistering(struct ctl_table_header *p) 1584 { 1585 /* 1586 * if p->used is 0, nobody will ever touch that entry again; 1587 * we'll eliminate all paths to it before dropping sysctl_lock 1588 */ 1589 if (unlikely(p->used)) { 1590 struct completion wait; 1591 init_completion(&wait); 1592 p->unregistering = &wait; 1593 spin_unlock(&sysctl_lock); 1594 wait_for_completion(&wait); 1595 spin_lock(&sysctl_lock); 1596 } else { 1597 /* anything non-NULL; we'll never dereference it */ 1598 p->unregistering = ERR_PTR(-EINVAL); 1599 } 1600 /* 1601 * do not remove from the list until nobody holds it; walking the 1602 * list in do_sysctl() relies on that. 1603 */ 1604 list_del_init(&p->ctl_entry); 1605 } 1606 1607 void sysctl_head_get(struct ctl_table_header *head) 1608 { 1609 spin_lock(&sysctl_lock); 1610 head->count++; 1611 spin_unlock(&sysctl_lock); 1612 } 1613 1614 void sysctl_head_put(struct ctl_table_header *head) 1615 { 1616 spin_lock(&sysctl_lock); 1617 if (!--head->count) 1618 kfree_rcu(head, rcu); 1619 spin_unlock(&sysctl_lock); 1620 } 1621 1622 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1623 { 1624 if (!head) 1625 BUG(); 1626 spin_lock(&sysctl_lock); 1627 if (!use_table(head)) 1628 head = ERR_PTR(-ENOENT); 1629 spin_unlock(&sysctl_lock); 1630 return head; 1631 } 1632 1633 void sysctl_head_finish(struct ctl_table_header *head) 1634 { 1635 if (!head) 1636 return; 1637 spin_lock(&sysctl_lock); 1638 unuse_table(head); 1639 spin_unlock(&sysctl_lock); 1640 } 1641 1642 static struct ctl_table_set * 1643 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1644 { 1645 struct ctl_table_set *set = &root->default_set; 1646 if (root->lookup) 1647 set = root->lookup(root, namespaces); 1648 return set; 1649 } 1650 1651 static struct list_head * 1652 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1653 { 1654 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1655 return &set->list; 1656 } 1657 1658 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1659 struct ctl_table_header *prev) 1660 { 1661 struct ctl_table_root *root; 1662 struct list_head *header_list; 1663 struct ctl_table_header *head; 1664 struct list_head *tmp; 1665 1666 spin_lock(&sysctl_lock); 1667 if (prev) { 1668 head = prev; 1669 tmp = &prev->ctl_entry; 1670 unuse_table(prev); 1671 goto next; 1672 } 1673 tmp = &root_table_header.ctl_entry; 1674 for (;;) { 1675 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1676 1677 if (!use_table(head)) 1678 goto next; 1679 spin_unlock(&sysctl_lock); 1680 return head; 1681 next: 1682 root = head->root; 1683 tmp = tmp->next; 1684 header_list = lookup_header_list(root, namespaces); 1685 if (tmp != header_list) 1686 continue; 1687 1688 do { 1689 root = list_entry(root->root_list.next, 1690 struct ctl_table_root, root_list); 1691 if (root == &sysctl_table_root) 1692 goto out; 1693 header_list = lookup_header_list(root, namespaces); 1694 } while (list_empty(header_list)); 1695 tmp = header_list->next; 1696 } 1697 out: 1698 spin_unlock(&sysctl_lock); 1699 return NULL; 1700 } 1701 1702 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1703 { 1704 return __sysctl_head_next(current->nsproxy, prev); 1705 } 1706 1707 void register_sysctl_root(struct ctl_table_root *root) 1708 { 1709 spin_lock(&sysctl_lock); 1710 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1711 spin_unlock(&sysctl_lock); 1712 } 1713 1714 /* 1715 * sysctl_perm does NOT grant the superuser all rights automatically, because 1716 * some sysctl variables are readonly even to root. 1717 */ 1718 1719 static int test_perm(int mode, int op) 1720 { 1721 if (!current_euid()) 1722 mode >>= 6; 1723 else if (in_egroup_p(0)) 1724 mode >>= 3; 1725 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1726 return 0; 1727 return -EACCES; 1728 } 1729 1730 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1731 { 1732 int mode; 1733 1734 if (root->permissions) 1735 mode = root->permissions(root, current->nsproxy, table); 1736 else 1737 mode = table->mode; 1738 1739 return test_perm(mode, op); 1740 } 1741 1742 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1743 { 1744 for (; table->procname; table++) { 1745 table->parent = parent; 1746 if (table->child) 1747 sysctl_set_parent(table, table->child); 1748 } 1749 } 1750 1751 static __init int sysctl_init(void) 1752 { 1753 sysctl_set_parent(NULL, root_table); 1754 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1755 sysctl_check_table(current->nsproxy, root_table); 1756 #endif 1757 return 0; 1758 } 1759 1760 core_initcall(sysctl_init); 1761 1762 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1763 struct ctl_table *table) 1764 { 1765 struct ctl_table *p; 1766 const char *s = branch->procname; 1767 1768 /* branch should have named subdirectory as its first element */ 1769 if (!s || !branch->child) 1770 return NULL; 1771 1772 /* ... and nothing else */ 1773 if (branch[1].procname) 1774 return NULL; 1775 1776 /* table should contain subdirectory with the same name */ 1777 for (p = table; p->procname; p++) { 1778 if (!p->child) 1779 continue; 1780 if (p->procname && strcmp(p->procname, s) == 0) 1781 return p; 1782 } 1783 return NULL; 1784 } 1785 1786 /* see if attaching q to p would be an improvement */ 1787 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1788 { 1789 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1790 struct ctl_table *next; 1791 int is_better = 0; 1792 int not_in_parent = !p->attached_by; 1793 1794 while ((next = is_branch_in(by, to)) != NULL) { 1795 if (by == q->attached_by) 1796 is_better = 1; 1797 if (to == p->attached_by) 1798 not_in_parent = 1; 1799 by = by->child; 1800 to = next->child; 1801 } 1802 1803 if (is_better && not_in_parent) { 1804 q->attached_by = by; 1805 q->attached_to = to; 1806 q->parent = p; 1807 } 1808 } 1809 1810 /** 1811 * __register_sysctl_paths - register a sysctl hierarchy 1812 * @root: List of sysctl headers to register on 1813 * @namespaces: Data to compute which lists of sysctl entries are visible 1814 * @path: The path to the directory the sysctl table is in. 1815 * @table: the top-level table structure 1816 * 1817 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1818 * array. A completely 0 filled entry terminates the table. 1819 * 1820 * The members of the &struct ctl_table structure are used as follows: 1821 * 1822 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1823 * enter a sysctl file 1824 * 1825 * data - a pointer to data for use by proc_handler 1826 * 1827 * maxlen - the maximum size in bytes of the data 1828 * 1829 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1830 * 1831 * child - a pointer to the child sysctl table if this entry is a directory, or 1832 * %NULL. 1833 * 1834 * proc_handler - the text handler routine (described below) 1835 * 1836 * de - for internal use by the sysctl routines 1837 * 1838 * extra1, extra2 - extra pointers usable by the proc handler routines 1839 * 1840 * Leaf nodes in the sysctl tree will be represented by a single file 1841 * under /proc; non-leaf nodes will be represented by directories. 1842 * 1843 * sysctl(2) can automatically manage read and write requests through 1844 * the sysctl table. The data and maxlen fields of the ctl_table 1845 * struct enable minimal validation of the values being written to be 1846 * performed, and the mode field allows minimal authentication. 1847 * 1848 * There must be a proc_handler routine for any terminal nodes 1849 * mirrored under /proc/sys (non-terminals are handled by a built-in 1850 * directory handler). Several default handlers are available to 1851 * cover common cases - 1852 * 1853 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1854 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1855 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1856 * 1857 * It is the handler's job to read the input buffer from user memory 1858 * and process it. The handler should return 0 on success. 1859 * 1860 * This routine returns %NULL on a failure to register, and a pointer 1861 * to the table header on success. 1862 */ 1863 struct ctl_table_header *__register_sysctl_paths( 1864 struct ctl_table_root *root, 1865 struct nsproxy *namespaces, 1866 const struct ctl_path *path, struct ctl_table *table) 1867 { 1868 struct ctl_table_header *header; 1869 struct ctl_table *new, **prevp; 1870 unsigned int n, npath; 1871 struct ctl_table_set *set; 1872 1873 /* Count the path components */ 1874 for (npath = 0; path[npath].procname; ++npath) 1875 ; 1876 1877 /* 1878 * For each path component, allocate a 2-element ctl_table array. 1879 * The first array element will be filled with the sysctl entry 1880 * for this, the second will be the sentinel (procname == 0). 1881 * 1882 * We allocate everything in one go so that we don't have to 1883 * worry about freeing additional memory in unregister_sysctl_table. 1884 */ 1885 header = kzalloc(sizeof(struct ctl_table_header) + 1886 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1887 if (!header) 1888 return NULL; 1889 1890 new = (struct ctl_table *) (header + 1); 1891 1892 /* Now connect the dots */ 1893 prevp = &header->ctl_table; 1894 for (n = 0; n < npath; ++n, ++path) { 1895 /* Copy the procname */ 1896 new->procname = path->procname; 1897 new->mode = 0555; 1898 1899 *prevp = new; 1900 prevp = &new->child; 1901 1902 new += 2; 1903 } 1904 *prevp = table; 1905 header->ctl_table_arg = table; 1906 1907 INIT_LIST_HEAD(&header->ctl_entry); 1908 header->used = 0; 1909 header->unregistering = NULL; 1910 header->root = root; 1911 sysctl_set_parent(NULL, header->ctl_table); 1912 header->count = 1; 1913 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1914 if (sysctl_check_table(namespaces, header->ctl_table)) { 1915 kfree(header); 1916 return NULL; 1917 } 1918 #endif 1919 spin_lock(&sysctl_lock); 1920 header->set = lookup_header_set(root, namespaces); 1921 header->attached_by = header->ctl_table; 1922 header->attached_to = root_table; 1923 header->parent = &root_table_header; 1924 for (set = header->set; set; set = set->parent) { 1925 struct ctl_table_header *p; 1926 list_for_each_entry(p, &set->list, ctl_entry) { 1927 if (p->unregistering) 1928 continue; 1929 try_attach(p, header); 1930 } 1931 } 1932 header->parent->count++; 1933 list_add_tail(&header->ctl_entry, &header->set->list); 1934 spin_unlock(&sysctl_lock); 1935 1936 return header; 1937 } 1938 1939 /** 1940 * register_sysctl_table_path - register a sysctl table hierarchy 1941 * @path: The path to the directory the sysctl table is in. 1942 * @table: the top-level table structure 1943 * 1944 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1945 * array. A completely 0 filled entry terminates the table. 1946 * 1947 * See __register_sysctl_paths for more details. 1948 */ 1949 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1950 struct ctl_table *table) 1951 { 1952 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1953 path, table); 1954 } 1955 1956 /** 1957 * register_sysctl_table - register a sysctl table hierarchy 1958 * @table: the top-level table structure 1959 * 1960 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1961 * array. A completely 0 filled entry terminates the table. 1962 * 1963 * See register_sysctl_paths for more details. 1964 */ 1965 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1966 { 1967 static const struct ctl_path null_path[] = { {} }; 1968 1969 return register_sysctl_paths(null_path, table); 1970 } 1971 1972 /** 1973 * unregister_sysctl_table - unregister a sysctl table hierarchy 1974 * @header: the header returned from register_sysctl_table 1975 * 1976 * Unregisters the sysctl table and all children. proc entries may not 1977 * actually be removed until they are no longer used by anyone. 1978 */ 1979 void unregister_sysctl_table(struct ctl_table_header * header) 1980 { 1981 might_sleep(); 1982 1983 if (header == NULL) 1984 return; 1985 1986 spin_lock(&sysctl_lock); 1987 start_unregistering(header); 1988 if (!--header->parent->count) { 1989 WARN_ON(1); 1990 kfree_rcu(header->parent, rcu); 1991 } 1992 if (!--header->count) 1993 kfree_rcu(header, rcu); 1994 spin_unlock(&sysctl_lock); 1995 } 1996 1997 int sysctl_is_seen(struct ctl_table_header *p) 1998 { 1999 struct ctl_table_set *set = p->set; 2000 int res; 2001 spin_lock(&sysctl_lock); 2002 if (p->unregistering) 2003 res = 0; 2004 else if (!set->is_seen) 2005 res = 1; 2006 else 2007 res = set->is_seen(set); 2008 spin_unlock(&sysctl_lock); 2009 return res; 2010 } 2011 2012 void setup_sysctl_set(struct ctl_table_set *p, 2013 struct ctl_table_set *parent, 2014 int (*is_seen)(struct ctl_table_set *)) 2015 { 2016 INIT_LIST_HEAD(&p->list); 2017 p->parent = parent ? parent : &sysctl_table_root.default_set; 2018 p->is_seen = is_seen; 2019 } 2020 2021 #else /* !CONFIG_SYSCTL */ 2022 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2023 { 2024 return NULL; 2025 } 2026 2027 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2028 struct ctl_table *table) 2029 { 2030 return NULL; 2031 } 2032 2033 void unregister_sysctl_table(struct ctl_table_header * table) 2034 { 2035 } 2036 2037 void setup_sysctl_set(struct ctl_table_set *p, 2038 struct ctl_table_set *parent, 2039 int (*is_seen)(struct ctl_table_set *)) 2040 { 2041 } 2042 2043 void sysctl_head_put(struct ctl_table_header *head) 2044 { 2045 } 2046 2047 #endif /* CONFIG_SYSCTL */ 2048 2049 /* 2050 * /proc/sys support 2051 */ 2052 2053 #ifdef CONFIG_PROC_SYSCTL 2054 2055 static int _proc_do_string(void* data, int maxlen, int write, 2056 void __user *buffer, 2057 size_t *lenp, loff_t *ppos) 2058 { 2059 size_t len; 2060 char __user *p; 2061 char c; 2062 2063 if (!data || !maxlen || !*lenp) { 2064 *lenp = 0; 2065 return 0; 2066 } 2067 2068 if (write) { 2069 len = 0; 2070 p = buffer; 2071 while (len < *lenp) { 2072 if (get_user(c, p++)) 2073 return -EFAULT; 2074 if (c == 0 || c == '\n') 2075 break; 2076 len++; 2077 } 2078 if (len >= maxlen) 2079 len = maxlen-1; 2080 if(copy_from_user(data, buffer, len)) 2081 return -EFAULT; 2082 ((char *) data)[len] = 0; 2083 *ppos += *lenp; 2084 } else { 2085 len = strlen(data); 2086 if (len > maxlen) 2087 len = maxlen; 2088 2089 if (*ppos > len) { 2090 *lenp = 0; 2091 return 0; 2092 } 2093 2094 data += *ppos; 2095 len -= *ppos; 2096 2097 if (len > *lenp) 2098 len = *lenp; 2099 if (len) 2100 if(copy_to_user(buffer, data, len)) 2101 return -EFAULT; 2102 if (len < *lenp) { 2103 if(put_user('\n', ((char __user *) buffer) + len)) 2104 return -EFAULT; 2105 len++; 2106 } 2107 *lenp = len; 2108 *ppos += len; 2109 } 2110 return 0; 2111 } 2112 2113 /** 2114 * proc_dostring - read a string sysctl 2115 * @table: the sysctl table 2116 * @write: %TRUE if this is a write to the sysctl file 2117 * @buffer: the user buffer 2118 * @lenp: the size of the user buffer 2119 * @ppos: file position 2120 * 2121 * Reads/writes a string from/to the user buffer. If the kernel 2122 * buffer provided is not large enough to hold the string, the 2123 * string is truncated. The copied string is %NULL-terminated. 2124 * If the string is being read by the user process, it is copied 2125 * and a newline '\n' is added. It is truncated if the buffer is 2126 * not large enough. 2127 * 2128 * Returns 0 on success. 2129 */ 2130 int proc_dostring(struct ctl_table *table, int write, 2131 void __user *buffer, size_t *lenp, loff_t *ppos) 2132 { 2133 return _proc_do_string(table->data, table->maxlen, write, 2134 buffer, lenp, ppos); 2135 } 2136 2137 static size_t proc_skip_spaces(char **buf) 2138 { 2139 size_t ret; 2140 char *tmp = skip_spaces(*buf); 2141 ret = tmp - *buf; 2142 *buf = tmp; 2143 return ret; 2144 } 2145 2146 static void proc_skip_char(char **buf, size_t *size, const char v) 2147 { 2148 while (*size) { 2149 if (**buf != v) 2150 break; 2151 (*size)--; 2152 (*buf)++; 2153 } 2154 } 2155 2156 #define TMPBUFLEN 22 2157 /** 2158 * proc_get_long - reads an ASCII formatted integer from a user buffer 2159 * 2160 * @buf: a kernel buffer 2161 * @size: size of the kernel buffer 2162 * @val: this is where the number will be stored 2163 * @neg: set to %TRUE if number is negative 2164 * @perm_tr: a vector which contains the allowed trailers 2165 * @perm_tr_len: size of the perm_tr vector 2166 * @tr: pointer to store the trailer character 2167 * 2168 * In case of success %0 is returned and @buf and @size are updated with 2169 * the amount of bytes read. If @tr is non-NULL and a trailing 2170 * character exists (size is non-zero after returning from this 2171 * function), @tr is updated with the trailing character. 2172 */ 2173 static int proc_get_long(char **buf, size_t *size, 2174 unsigned long *val, bool *neg, 2175 const char *perm_tr, unsigned perm_tr_len, char *tr) 2176 { 2177 int len; 2178 char *p, tmp[TMPBUFLEN]; 2179 2180 if (!*size) 2181 return -EINVAL; 2182 2183 len = *size; 2184 if (len > TMPBUFLEN - 1) 2185 len = TMPBUFLEN - 1; 2186 2187 memcpy(tmp, *buf, len); 2188 2189 tmp[len] = 0; 2190 p = tmp; 2191 if (*p == '-' && *size > 1) { 2192 *neg = true; 2193 p++; 2194 } else 2195 *neg = false; 2196 if (!isdigit(*p)) 2197 return -EINVAL; 2198 2199 *val = simple_strtoul(p, &p, 0); 2200 2201 len = p - tmp; 2202 2203 /* We don't know if the next char is whitespace thus we may accept 2204 * invalid integers (e.g. 1234...a) or two integers instead of one 2205 * (e.g. 123...1). So lets not allow such large numbers. */ 2206 if (len == TMPBUFLEN - 1) 2207 return -EINVAL; 2208 2209 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2210 return -EINVAL; 2211 2212 if (tr && (len < *size)) 2213 *tr = *p; 2214 2215 *buf += len; 2216 *size -= len; 2217 2218 return 0; 2219 } 2220 2221 /** 2222 * proc_put_long - converts an integer to a decimal ASCII formatted string 2223 * 2224 * @buf: the user buffer 2225 * @size: the size of the user buffer 2226 * @val: the integer to be converted 2227 * @neg: sign of the number, %TRUE for negative 2228 * 2229 * In case of success %0 is returned and @buf and @size are updated with 2230 * the amount of bytes written. 2231 */ 2232 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2233 bool neg) 2234 { 2235 int len; 2236 char tmp[TMPBUFLEN], *p = tmp; 2237 2238 sprintf(p, "%s%lu", neg ? "-" : "", val); 2239 len = strlen(tmp); 2240 if (len > *size) 2241 len = *size; 2242 if (copy_to_user(*buf, tmp, len)) 2243 return -EFAULT; 2244 *size -= len; 2245 *buf += len; 2246 return 0; 2247 } 2248 #undef TMPBUFLEN 2249 2250 static int proc_put_char(void __user **buf, size_t *size, char c) 2251 { 2252 if (*size) { 2253 char __user **buffer = (char __user **)buf; 2254 if (put_user(c, *buffer)) 2255 return -EFAULT; 2256 (*size)--, (*buffer)++; 2257 *buf = *buffer; 2258 } 2259 return 0; 2260 } 2261 2262 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2263 int *valp, 2264 int write, void *data) 2265 { 2266 if (write) { 2267 *valp = *negp ? -*lvalp : *lvalp; 2268 } else { 2269 int val = *valp; 2270 if (val < 0) { 2271 *negp = true; 2272 *lvalp = (unsigned long)-val; 2273 } else { 2274 *negp = false; 2275 *lvalp = (unsigned long)val; 2276 } 2277 } 2278 return 0; 2279 } 2280 2281 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2282 2283 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2284 int write, void __user *buffer, 2285 size_t *lenp, loff_t *ppos, 2286 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2287 int write, void *data), 2288 void *data) 2289 { 2290 int *i, vleft, first = 1, err = 0; 2291 unsigned long page = 0; 2292 size_t left; 2293 char *kbuf; 2294 2295 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2296 *lenp = 0; 2297 return 0; 2298 } 2299 2300 i = (int *) tbl_data; 2301 vleft = table->maxlen / sizeof(*i); 2302 left = *lenp; 2303 2304 if (!conv) 2305 conv = do_proc_dointvec_conv; 2306 2307 if (write) { 2308 if (left > PAGE_SIZE - 1) 2309 left = PAGE_SIZE - 1; 2310 page = __get_free_page(GFP_TEMPORARY); 2311 kbuf = (char *) page; 2312 if (!kbuf) 2313 return -ENOMEM; 2314 if (copy_from_user(kbuf, buffer, left)) { 2315 err = -EFAULT; 2316 goto free; 2317 } 2318 kbuf[left] = 0; 2319 } 2320 2321 for (; left && vleft--; i++, first=0) { 2322 unsigned long lval; 2323 bool neg; 2324 2325 if (write) { 2326 left -= proc_skip_spaces(&kbuf); 2327 2328 if (!left) 2329 break; 2330 err = proc_get_long(&kbuf, &left, &lval, &neg, 2331 proc_wspace_sep, 2332 sizeof(proc_wspace_sep), NULL); 2333 if (err) 2334 break; 2335 if (conv(&neg, &lval, i, 1, data)) { 2336 err = -EINVAL; 2337 break; 2338 } 2339 } else { 2340 if (conv(&neg, &lval, i, 0, data)) { 2341 err = -EINVAL; 2342 break; 2343 } 2344 if (!first) 2345 err = proc_put_char(&buffer, &left, '\t'); 2346 if (err) 2347 break; 2348 err = proc_put_long(&buffer, &left, lval, neg); 2349 if (err) 2350 break; 2351 } 2352 } 2353 2354 if (!write && !first && left && !err) 2355 err = proc_put_char(&buffer, &left, '\n'); 2356 if (write && !err && left) 2357 left -= proc_skip_spaces(&kbuf); 2358 free: 2359 if (write) { 2360 free_page(page); 2361 if (first) 2362 return err ? : -EINVAL; 2363 } 2364 *lenp -= left; 2365 *ppos += *lenp; 2366 return err; 2367 } 2368 2369 static int do_proc_dointvec(struct ctl_table *table, int write, 2370 void __user *buffer, size_t *lenp, loff_t *ppos, 2371 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2372 int write, void *data), 2373 void *data) 2374 { 2375 return __do_proc_dointvec(table->data, table, write, 2376 buffer, lenp, ppos, conv, data); 2377 } 2378 2379 /** 2380 * proc_dointvec - read a vector of integers 2381 * @table: the sysctl table 2382 * @write: %TRUE if this is a write to the sysctl file 2383 * @buffer: the user buffer 2384 * @lenp: the size of the user buffer 2385 * @ppos: file position 2386 * 2387 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2388 * values from/to the user buffer, treated as an ASCII string. 2389 * 2390 * Returns 0 on success. 2391 */ 2392 int proc_dointvec(struct ctl_table *table, int write, 2393 void __user *buffer, size_t *lenp, loff_t *ppos) 2394 { 2395 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2396 NULL,NULL); 2397 } 2398 2399 /* 2400 * Taint values can only be increased 2401 * This means we can safely use a temporary. 2402 */ 2403 static int proc_taint(struct ctl_table *table, int write, 2404 void __user *buffer, size_t *lenp, loff_t *ppos) 2405 { 2406 struct ctl_table t; 2407 unsigned long tmptaint = get_taint(); 2408 int err; 2409 2410 if (write && !capable(CAP_SYS_ADMIN)) 2411 return -EPERM; 2412 2413 t = *table; 2414 t.data = &tmptaint; 2415 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2416 if (err < 0) 2417 return err; 2418 2419 if (write) { 2420 /* 2421 * Poor man's atomic or. Not worth adding a primitive 2422 * to everyone's atomic.h for this 2423 */ 2424 int i; 2425 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2426 if ((tmptaint >> i) & 1) 2427 add_taint(i); 2428 } 2429 } 2430 2431 return err; 2432 } 2433 2434 #ifdef CONFIG_PRINTK 2435 static int proc_dmesg_restrict(struct ctl_table *table, int write, 2436 void __user *buffer, size_t *lenp, loff_t *ppos) 2437 { 2438 if (write && !capable(CAP_SYS_ADMIN)) 2439 return -EPERM; 2440 2441 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2442 } 2443 #endif 2444 2445 struct do_proc_dointvec_minmax_conv_param { 2446 int *min; 2447 int *max; 2448 }; 2449 2450 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2451 int *valp, 2452 int write, void *data) 2453 { 2454 struct do_proc_dointvec_minmax_conv_param *param = data; 2455 if (write) { 2456 int val = *negp ? -*lvalp : *lvalp; 2457 if ((param->min && *param->min > val) || 2458 (param->max && *param->max < val)) 2459 return -EINVAL; 2460 *valp = val; 2461 } else { 2462 int val = *valp; 2463 if (val < 0) { 2464 *negp = true; 2465 *lvalp = (unsigned long)-val; 2466 } else { 2467 *negp = false; 2468 *lvalp = (unsigned long)val; 2469 } 2470 } 2471 return 0; 2472 } 2473 2474 /** 2475 * proc_dointvec_minmax - read a vector of integers with min/max values 2476 * @table: the sysctl table 2477 * @write: %TRUE if this is a write to the sysctl file 2478 * @buffer: the user buffer 2479 * @lenp: the size of the user buffer 2480 * @ppos: file position 2481 * 2482 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2483 * values from/to the user buffer, treated as an ASCII string. 2484 * 2485 * This routine will ensure the values are within the range specified by 2486 * table->extra1 (min) and table->extra2 (max). 2487 * 2488 * Returns 0 on success. 2489 */ 2490 int proc_dointvec_minmax(struct ctl_table *table, int write, 2491 void __user *buffer, size_t *lenp, loff_t *ppos) 2492 { 2493 struct do_proc_dointvec_minmax_conv_param param = { 2494 .min = (int *) table->extra1, 2495 .max = (int *) table->extra2, 2496 }; 2497 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2498 do_proc_dointvec_minmax_conv, ¶m); 2499 } 2500 2501 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2502 void __user *buffer, 2503 size_t *lenp, loff_t *ppos, 2504 unsigned long convmul, 2505 unsigned long convdiv) 2506 { 2507 unsigned long *i, *min, *max; 2508 int vleft, first = 1, err = 0; 2509 unsigned long page = 0; 2510 size_t left; 2511 char *kbuf; 2512 2513 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2514 *lenp = 0; 2515 return 0; 2516 } 2517 2518 i = (unsigned long *) data; 2519 min = (unsigned long *) table->extra1; 2520 max = (unsigned long *) table->extra2; 2521 vleft = table->maxlen / sizeof(unsigned long); 2522 left = *lenp; 2523 2524 if (write) { 2525 if (left > PAGE_SIZE - 1) 2526 left = PAGE_SIZE - 1; 2527 page = __get_free_page(GFP_TEMPORARY); 2528 kbuf = (char *) page; 2529 if (!kbuf) 2530 return -ENOMEM; 2531 if (copy_from_user(kbuf, buffer, left)) { 2532 err = -EFAULT; 2533 goto free; 2534 } 2535 kbuf[left] = 0; 2536 } 2537 2538 for (; left && vleft--; i++, first = 0) { 2539 unsigned long val; 2540 2541 if (write) { 2542 bool neg; 2543 2544 left -= proc_skip_spaces(&kbuf); 2545 2546 err = proc_get_long(&kbuf, &left, &val, &neg, 2547 proc_wspace_sep, 2548 sizeof(proc_wspace_sep), NULL); 2549 if (err) 2550 break; 2551 if (neg) 2552 continue; 2553 if ((min && val < *min) || (max && val > *max)) 2554 continue; 2555 *i = val; 2556 } else { 2557 val = convdiv * (*i) / convmul; 2558 if (!first) 2559 err = proc_put_char(&buffer, &left, '\t'); 2560 err = proc_put_long(&buffer, &left, val, false); 2561 if (err) 2562 break; 2563 } 2564 } 2565 2566 if (!write && !first && left && !err) 2567 err = proc_put_char(&buffer, &left, '\n'); 2568 if (write && !err) 2569 left -= proc_skip_spaces(&kbuf); 2570 free: 2571 if (write) { 2572 free_page(page); 2573 if (first) 2574 return err ? : -EINVAL; 2575 } 2576 *lenp -= left; 2577 *ppos += *lenp; 2578 return err; 2579 } 2580 2581 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2582 void __user *buffer, 2583 size_t *lenp, loff_t *ppos, 2584 unsigned long convmul, 2585 unsigned long convdiv) 2586 { 2587 return __do_proc_doulongvec_minmax(table->data, table, write, 2588 buffer, lenp, ppos, convmul, convdiv); 2589 } 2590 2591 /** 2592 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2593 * @table: the sysctl table 2594 * @write: %TRUE if this is a write to the sysctl file 2595 * @buffer: the user buffer 2596 * @lenp: the size of the user buffer 2597 * @ppos: file position 2598 * 2599 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2600 * values from/to the user buffer, treated as an ASCII string. 2601 * 2602 * This routine will ensure the values are within the range specified by 2603 * table->extra1 (min) and table->extra2 (max). 2604 * 2605 * Returns 0 on success. 2606 */ 2607 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2608 void __user *buffer, size_t *lenp, loff_t *ppos) 2609 { 2610 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2611 } 2612 2613 /** 2614 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2615 * @table: the sysctl table 2616 * @write: %TRUE if this is a write to the sysctl file 2617 * @buffer: the user buffer 2618 * @lenp: the size of the user buffer 2619 * @ppos: file position 2620 * 2621 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2622 * values from/to the user buffer, treated as an ASCII string. The values 2623 * are treated as milliseconds, and converted to jiffies when they are stored. 2624 * 2625 * This routine will ensure the values are within the range specified by 2626 * table->extra1 (min) and table->extra2 (max). 2627 * 2628 * Returns 0 on success. 2629 */ 2630 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2631 void __user *buffer, 2632 size_t *lenp, loff_t *ppos) 2633 { 2634 return do_proc_doulongvec_minmax(table, write, buffer, 2635 lenp, ppos, HZ, 1000l); 2636 } 2637 2638 2639 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2640 int *valp, 2641 int write, void *data) 2642 { 2643 if (write) { 2644 if (*lvalp > LONG_MAX / HZ) 2645 return 1; 2646 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2647 } else { 2648 int val = *valp; 2649 unsigned long lval; 2650 if (val < 0) { 2651 *negp = true; 2652 lval = (unsigned long)-val; 2653 } else { 2654 *negp = false; 2655 lval = (unsigned long)val; 2656 } 2657 *lvalp = lval / HZ; 2658 } 2659 return 0; 2660 } 2661 2662 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2663 int *valp, 2664 int write, void *data) 2665 { 2666 if (write) { 2667 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2668 return 1; 2669 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2670 } else { 2671 int val = *valp; 2672 unsigned long lval; 2673 if (val < 0) { 2674 *negp = true; 2675 lval = (unsigned long)-val; 2676 } else { 2677 *negp = false; 2678 lval = (unsigned long)val; 2679 } 2680 *lvalp = jiffies_to_clock_t(lval); 2681 } 2682 return 0; 2683 } 2684 2685 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2686 int *valp, 2687 int write, void *data) 2688 { 2689 if (write) { 2690 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2691 } else { 2692 int val = *valp; 2693 unsigned long lval; 2694 if (val < 0) { 2695 *negp = true; 2696 lval = (unsigned long)-val; 2697 } else { 2698 *negp = false; 2699 lval = (unsigned long)val; 2700 } 2701 *lvalp = jiffies_to_msecs(lval); 2702 } 2703 return 0; 2704 } 2705 2706 /** 2707 * proc_dointvec_jiffies - read a vector of integers as seconds 2708 * @table: the sysctl table 2709 * @write: %TRUE if this is a write to the sysctl file 2710 * @buffer: the user buffer 2711 * @lenp: the size of the user buffer 2712 * @ppos: file position 2713 * 2714 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2715 * values from/to the user buffer, treated as an ASCII string. 2716 * The values read are assumed to be in seconds, and are converted into 2717 * jiffies. 2718 * 2719 * Returns 0 on success. 2720 */ 2721 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2722 void __user *buffer, size_t *lenp, loff_t *ppos) 2723 { 2724 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2725 do_proc_dointvec_jiffies_conv,NULL); 2726 } 2727 2728 /** 2729 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2730 * @table: the sysctl table 2731 * @write: %TRUE if this is a write to the sysctl file 2732 * @buffer: the user buffer 2733 * @lenp: the size of the user buffer 2734 * @ppos: pointer to the file position 2735 * 2736 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2737 * values from/to the user buffer, treated as an ASCII string. 2738 * The values read are assumed to be in 1/USER_HZ seconds, and 2739 * are converted into jiffies. 2740 * 2741 * Returns 0 on success. 2742 */ 2743 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2744 void __user *buffer, size_t *lenp, loff_t *ppos) 2745 { 2746 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2747 do_proc_dointvec_userhz_jiffies_conv,NULL); 2748 } 2749 2750 /** 2751 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2752 * @table: the sysctl table 2753 * @write: %TRUE if this is a write to the sysctl file 2754 * @buffer: the user buffer 2755 * @lenp: the size of the user buffer 2756 * @ppos: file position 2757 * @ppos: the current position in the file 2758 * 2759 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2760 * values from/to the user buffer, treated as an ASCII string. 2761 * The values read are assumed to be in 1/1000 seconds, and 2762 * are converted into jiffies. 2763 * 2764 * Returns 0 on success. 2765 */ 2766 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2767 void __user *buffer, size_t *lenp, loff_t *ppos) 2768 { 2769 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2770 do_proc_dointvec_ms_jiffies_conv, NULL); 2771 } 2772 2773 static int proc_do_cad_pid(struct ctl_table *table, int write, 2774 void __user *buffer, size_t *lenp, loff_t *ppos) 2775 { 2776 struct pid *new_pid; 2777 pid_t tmp; 2778 int r; 2779 2780 tmp = pid_vnr(cad_pid); 2781 2782 r = __do_proc_dointvec(&tmp, table, write, buffer, 2783 lenp, ppos, NULL, NULL); 2784 if (r || !write) 2785 return r; 2786 2787 new_pid = find_get_pid(tmp); 2788 if (!new_pid) 2789 return -ESRCH; 2790 2791 put_pid(xchg(&cad_pid, new_pid)); 2792 return 0; 2793 } 2794 2795 /** 2796 * proc_do_large_bitmap - read/write from/to a large bitmap 2797 * @table: the sysctl table 2798 * @write: %TRUE if this is a write to the sysctl file 2799 * @buffer: the user buffer 2800 * @lenp: the size of the user buffer 2801 * @ppos: file position 2802 * 2803 * The bitmap is stored at table->data and the bitmap length (in bits) 2804 * in table->maxlen. 2805 * 2806 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2807 * large bitmaps may be represented in a compact manner. Writing into 2808 * the file will clear the bitmap then update it with the given input. 2809 * 2810 * Returns 0 on success. 2811 */ 2812 int proc_do_large_bitmap(struct ctl_table *table, int write, 2813 void __user *buffer, size_t *lenp, loff_t *ppos) 2814 { 2815 int err = 0; 2816 bool first = 1; 2817 size_t left = *lenp; 2818 unsigned long bitmap_len = table->maxlen; 2819 unsigned long *bitmap = (unsigned long *) table->data; 2820 unsigned long *tmp_bitmap = NULL; 2821 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2822 2823 if (!bitmap_len || !left || (*ppos && !write)) { 2824 *lenp = 0; 2825 return 0; 2826 } 2827 2828 if (write) { 2829 unsigned long page = 0; 2830 char *kbuf; 2831 2832 if (left > PAGE_SIZE - 1) 2833 left = PAGE_SIZE - 1; 2834 2835 page = __get_free_page(GFP_TEMPORARY); 2836 kbuf = (char *) page; 2837 if (!kbuf) 2838 return -ENOMEM; 2839 if (copy_from_user(kbuf, buffer, left)) { 2840 free_page(page); 2841 return -EFAULT; 2842 } 2843 kbuf[left] = 0; 2844 2845 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2846 GFP_KERNEL); 2847 if (!tmp_bitmap) { 2848 free_page(page); 2849 return -ENOMEM; 2850 } 2851 proc_skip_char(&kbuf, &left, '\n'); 2852 while (!err && left) { 2853 unsigned long val_a, val_b; 2854 bool neg; 2855 2856 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2857 sizeof(tr_a), &c); 2858 if (err) 2859 break; 2860 if (val_a >= bitmap_len || neg) { 2861 err = -EINVAL; 2862 break; 2863 } 2864 2865 val_b = val_a; 2866 if (left) { 2867 kbuf++; 2868 left--; 2869 } 2870 2871 if (c == '-') { 2872 err = proc_get_long(&kbuf, &left, &val_b, 2873 &neg, tr_b, sizeof(tr_b), 2874 &c); 2875 if (err) 2876 break; 2877 if (val_b >= bitmap_len || neg || 2878 val_a > val_b) { 2879 err = -EINVAL; 2880 break; 2881 } 2882 if (left) { 2883 kbuf++; 2884 left--; 2885 } 2886 } 2887 2888 while (val_a <= val_b) 2889 set_bit(val_a++, tmp_bitmap); 2890 2891 first = 0; 2892 proc_skip_char(&kbuf, &left, '\n'); 2893 } 2894 free_page(page); 2895 } else { 2896 unsigned long bit_a, bit_b = 0; 2897 2898 while (left) { 2899 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2900 if (bit_a >= bitmap_len) 2901 break; 2902 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2903 bit_a + 1) - 1; 2904 2905 if (!first) { 2906 err = proc_put_char(&buffer, &left, ','); 2907 if (err) 2908 break; 2909 } 2910 err = proc_put_long(&buffer, &left, bit_a, false); 2911 if (err) 2912 break; 2913 if (bit_a != bit_b) { 2914 err = proc_put_char(&buffer, &left, '-'); 2915 if (err) 2916 break; 2917 err = proc_put_long(&buffer, &left, bit_b, false); 2918 if (err) 2919 break; 2920 } 2921 2922 first = 0; bit_b++; 2923 } 2924 if (!err) 2925 err = proc_put_char(&buffer, &left, '\n'); 2926 } 2927 2928 if (!err) { 2929 if (write) { 2930 if (*ppos) 2931 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2932 else 2933 memcpy(bitmap, tmp_bitmap, 2934 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2935 } 2936 kfree(tmp_bitmap); 2937 *lenp -= left; 2938 *ppos += *lenp; 2939 return 0; 2940 } else { 2941 kfree(tmp_bitmap); 2942 return err; 2943 } 2944 } 2945 2946 #else /* CONFIG_PROC_SYSCTL */ 2947 2948 int proc_dostring(struct ctl_table *table, int write, 2949 void __user *buffer, size_t *lenp, loff_t *ppos) 2950 { 2951 return -ENOSYS; 2952 } 2953 2954 int proc_dointvec(struct ctl_table *table, int write, 2955 void __user *buffer, size_t *lenp, loff_t *ppos) 2956 { 2957 return -ENOSYS; 2958 } 2959 2960 int proc_dointvec_minmax(struct ctl_table *table, int write, 2961 void __user *buffer, size_t *lenp, loff_t *ppos) 2962 { 2963 return -ENOSYS; 2964 } 2965 2966 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2967 void __user *buffer, size_t *lenp, loff_t *ppos) 2968 { 2969 return -ENOSYS; 2970 } 2971 2972 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2973 void __user *buffer, size_t *lenp, loff_t *ppos) 2974 { 2975 return -ENOSYS; 2976 } 2977 2978 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2979 void __user *buffer, size_t *lenp, loff_t *ppos) 2980 { 2981 return -ENOSYS; 2982 } 2983 2984 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2985 void __user *buffer, size_t *lenp, loff_t *ppos) 2986 { 2987 return -ENOSYS; 2988 } 2989 2990 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2991 void __user *buffer, 2992 size_t *lenp, loff_t *ppos) 2993 { 2994 return -ENOSYS; 2995 } 2996 2997 2998 #endif /* CONFIG_PROC_SYSCTL */ 2999 3000 /* 3001 * No sense putting this after each symbol definition, twice, 3002 * exception granted :-) 3003 */ 3004 EXPORT_SYMBOL(proc_dointvec); 3005 EXPORT_SYMBOL(proc_dointvec_jiffies); 3006 EXPORT_SYMBOL(proc_dointvec_minmax); 3007 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3008 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3009 EXPORT_SYMBOL(proc_dostring); 3010 EXPORT_SYMBOL(proc_doulongvec_minmax); 3011 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3012 EXPORT_SYMBOL(register_sysctl_table); 3013 EXPORT_SYMBOL(register_sysctl_paths); 3014 EXPORT_SYMBOL(unregister_sysctl_table); 3015