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