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/proc_fs.h> 27 #include <linux/security.h> 28 #include <linux/ctype.h> 29 #include <linux/utsname.h> 30 #include <linux/smp_lock.h> 31 #include <linux/fs.h> 32 #include <linux/init.h> 33 #include <linux/kernel.h> 34 #include <linux/kobject.h> 35 #include <linux/net.h> 36 #include <linux/sysrq.h> 37 #include <linux/highuid.h> 38 #include <linux/writeback.h> 39 #include <linux/hugetlb.h> 40 #include <linux/initrd.h> 41 #include <linux/key.h> 42 #include <linux/times.h> 43 #include <linux/limits.h> 44 #include <linux/dcache.h> 45 #include <linux/syscalls.h> 46 #include <linux/nfs_fs.h> 47 #include <linux/acpi.h> 48 #include <linux/reboot.h> 49 #include <linux/ftrace.h> 50 51 #include <asm/uaccess.h> 52 #include <asm/processor.h> 53 54 #ifdef CONFIG_X86 55 #include <asm/nmi.h> 56 #include <asm/stacktrace.h> 57 #include <asm/io.h> 58 #endif 59 60 static int deprecated_sysctl_warning(struct __sysctl_args *args); 61 62 #if defined(CONFIG_SYSCTL) 63 64 /* External variables not in a header file. */ 65 extern int C_A_D; 66 extern int print_fatal_signals; 67 extern int sysctl_overcommit_memory; 68 extern int sysctl_overcommit_ratio; 69 extern int sysctl_panic_on_oom; 70 extern int sysctl_oom_kill_allocating_task; 71 extern int sysctl_oom_dump_tasks; 72 extern int max_threads; 73 extern int core_uses_pid; 74 extern int suid_dumpable; 75 extern char core_pattern[]; 76 extern int pid_max; 77 extern int min_free_kbytes; 78 extern int pid_max_min, pid_max_max; 79 extern int sysctl_drop_caches; 80 extern int percpu_pagelist_fraction; 81 extern int compat_log; 82 extern int maps_protect; 83 extern int sysctl_stat_interval; 84 extern int latencytop_enabled; 85 extern int sysctl_nr_open_min, sysctl_nr_open_max; 86 #ifdef CONFIG_RCU_TORTURE_TEST 87 extern int rcutorture_runnable; 88 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ 89 90 /* Constants used for minimum and maximum */ 91 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM) 92 static int one = 1; 93 #endif 94 95 #ifdef CONFIG_DETECT_SOFTLOCKUP 96 static int sixty = 60; 97 #endif 98 99 #ifdef CONFIG_MMU 100 static int two = 2; 101 #endif 102 103 static int zero; 104 static int one_hundred = 100; 105 106 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 107 static int maxolduid = 65535; 108 static int minolduid; 109 static int min_percpu_pagelist_fract = 8; 110 111 static int ngroups_max = NGROUPS_MAX; 112 113 #ifdef CONFIG_KMOD 114 extern char modprobe_path[]; 115 #endif 116 #ifdef CONFIG_CHR_DEV_SG 117 extern int sg_big_buff; 118 #endif 119 120 #ifdef __sparc__ 121 extern char reboot_command []; 122 extern int stop_a_enabled; 123 extern int scons_pwroff; 124 #endif 125 126 #ifdef __hppa__ 127 extern int pwrsw_enabled; 128 extern int unaligned_enabled; 129 #endif 130 131 #ifdef CONFIG_S390 132 #ifdef CONFIG_MATHEMU 133 extern int sysctl_ieee_emulation_warnings; 134 #endif 135 extern int sysctl_userprocess_debug; 136 extern int spin_retry; 137 #endif 138 139 #ifdef CONFIG_BSD_PROCESS_ACCT 140 extern int acct_parm[]; 141 #endif 142 143 #ifdef CONFIG_IA64 144 extern int no_unaligned_warning; 145 #endif 146 147 #ifdef CONFIG_RT_MUTEXES 148 extern int max_lock_depth; 149 #endif 150 151 #ifdef CONFIG_PROC_SYSCTL 152 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 153 void __user *buffer, size_t *lenp, loff_t *ppos); 154 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, 155 void __user *buffer, size_t *lenp, loff_t *ppos); 156 #endif 157 158 static struct ctl_table root_table[]; 159 static struct ctl_table_root sysctl_table_root; 160 static struct ctl_table_header root_table_header = { 161 .ctl_table = root_table, 162 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list), 163 .root = &sysctl_table_root, 164 }; 165 static struct ctl_table_root sysctl_table_root = { 166 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 167 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry), 168 }; 169 170 static struct ctl_table kern_table[]; 171 static struct ctl_table vm_table[]; 172 static struct ctl_table fs_table[]; 173 static struct ctl_table debug_table[]; 174 static struct ctl_table dev_table[]; 175 extern struct ctl_table random_table[]; 176 #ifdef CONFIG_INOTIFY_USER 177 extern struct ctl_table inotify_table[]; 178 #endif 179 180 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 181 int sysctl_legacy_va_layout; 182 #endif 183 184 extern int prove_locking; 185 extern int lock_stat; 186 187 /* The default sysctl tables: */ 188 189 static struct ctl_table root_table[] = { 190 { 191 .ctl_name = CTL_KERN, 192 .procname = "kernel", 193 .mode = 0555, 194 .child = kern_table, 195 }, 196 { 197 .ctl_name = CTL_VM, 198 .procname = "vm", 199 .mode = 0555, 200 .child = vm_table, 201 }, 202 { 203 .ctl_name = CTL_FS, 204 .procname = "fs", 205 .mode = 0555, 206 .child = fs_table, 207 }, 208 { 209 .ctl_name = CTL_DEBUG, 210 .procname = "debug", 211 .mode = 0555, 212 .child = debug_table, 213 }, 214 { 215 .ctl_name = CTL_DEV, 216 .procname = "dev", 217 .mode = 0555, 218 .child = dev_table, 219 }, 220 /* 221 * NOTE: do not add new entries to this table unless you have read 222 * Documentation/sysctl/ctl_unnumbered.txt 223 */ 224 { .ctl_name = 0 } 225 }; 226 227 #ifdef CONFIG_SCHED_DEBUG 228 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 229 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 230 static int min_wakeup_granularity_ns; /* 0 usecs */ 231 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 232 #endif 233 234 static struct ctl_table kern_table[] = { 235 #ifdef CONFIG_SCHED_DEBUG 236 { 237 .ctl_name = CTL_UNNUMBERED, 238 .procname = "sched_min_granularity_ns", 239 .data = &sysctl_sched_min_granularity, 240 .maxlen = sizeof(unsigned int), 241 .mode = 0644, 242 .proc_handler = &sched_nr_latency_handler, 243 .strategy = &sysctl_intvec, 244 .extra1 = &min_sched_granularity_ns, 245 .extra2 = &max_sched_granularity_ns, 246 }, 247 { 248 .ctl_name = CTL_UNNUMBERED, 249 .procname = "sched_latency_ns", 250 .data = &sysctl_sched_latency, 251 .maxlen = sizeof(unsigned int), 252 .mode = 0644, 253 .proc_handler = &sched_nr_latency_handler, 254 .strategy = &sysctl_intvec, 255 .extra1 = &min_sched_granularity_ns, 256 .extra2 = &max_sched_granularity_ns, 257 }, 258 { 259 .ctl_name = CTL_UNNUMBERED, 260 .procname = "sched_wakeup_granularity_ns", 261 .data = &sysctl_sched_wakeup_granularity, 262 .maxlen = sizeof(unsigned int), 263 .mode = 0644, 264 .proc_handler = &proc_dointvec_minmax, 265 .strategy = &sysctl_intvec, 266 .extra1 = &min_wakeup_granularity_ns, 267 .extra2 = &max_wakeup_granularity_ns, 268 }, 269 { 270 .ctl_name = CTL_UNNUMBERED, 271 .procname = "sched_shares_ratelimit", 272 .data = &sysctl_sched_shares_ratelimit, 273 .maxlen = sizeof(unsigned int), 274 .mode = 0644, 275 .proc_handler = &proc_dointvec, 276 }, 277 { 278 .ctl_name = CTL_UNNUMBERED, 279 .procname = "sched_child_runs_first", 280 .data = &sysctl_sched_child_runs_first, 281 .maxlen = sizeof(unsigned int), 282 .mode = 0644, 283 .proc_handler = &proc_dointvec, 284 }, 285 { 286 .ctl_name = CTL_UNNUMBERED, 287 .procname = "sched_features", 288 .data = &sysctl_sched_features, 289 .maxlen = sizeof(unsigned int), 290 .mode = 0644, 291 .proc_handler = &proc_dointvec, 292 }, 293 { 294 .ctl_name = CTL_UNNUMBERED, 295 .procname = "sched_migration_cost", 296 .data = &sysctl_sched_migration_cost, 297 .maxlen = sizeof(unsigned int), 298 .mode = 0644, 299 .proc_handler = &proc_dointvec, 300 }, 301 { 302 .ctl_name = CTL_UNNUMBERED, 303 .procname = "sched_nr_migrate", 304 .data = &sysctl_sched_nr_migrate, 305 .maxlen = sizeof(unsigned int), 306 .mode = 0644, 307 .proc_handler = &proc_dointvec, 308 }, 309 #endif 310 { 311 .ctl_name = CTL_UNNUMBERED, 312 .procname = "sched_rt_period_us", 313 .data = &sysctl_sched_rt_period, 314 .maxlen = sizeof(unsigned int), 315 .mode = 0644, 316 .proc_handler = &sched_rt_handler, 317 }, 318 { 319 .ctl_name = CTL_UNNUMBERED, 320 .procname = "sched_rt_runtime_us", 321 .data = &sysctl_sched_rt_runtime, 322 .maxlen = sizeof(int), 323 .mode = 0644, 324 .proc_handler = &sched_rt_handler, 325 }, 326 { 327 .ctl_name = CTL_UNNUMBERED, 328 .procname = "sched_compat_yield", 329 .data = &sysctl_sched_compat_yield, 330 .maxlen = sizeof(unsigned int), 331 .mode = 0644, 332 .proc_handler = &proc_dointvec, 333 }, 334 #ifdef CONFIG_PROVE_LOCKING 335 { 336 .ctl_name = CTL_UNNUMBERED, 337 .procname = "prove_locking", 338 .data = &prove_locking, 339 .maxlen = sizeof(int), 340 .mode = 0644, 341 .proc_handler = &proc_dointvec, 342 }, 343 #endif 344 #ifdef CONFIG_LOCK_STAT 345 { 346 .ctl_name = CTL_UNNUMBERED, 347 .procname = "lock_stat", 348 .data = &lock_stat, 349 .maxlen = sizeof(int), 350 .mode = 0644, 351 .proc_handler = &proc_dointvec, 352 }, 353 #endif 354 { 355 .ctl_name = KERN_PANIC, 356 .procname = "panic", 357 .data = &panic_timeout, 358 .maxlen = sizeof(int), 359 .mode = 0644, 360 .proc_handler = &proc_dointvec, 361 }, 362 { 363 .ctl_name = KERN_CORE_USES_PID, 364 .procname = "core_uses_pid", 365 .data = &core_uses_pid, 366 .maxlen = sizeof(int), 367 .mode = 0644, 368 .proc_handler = &proc_dointvec, 369 }, 370 { 371 .ctl_name = KERN_CORE_PATTERN, 372 .procname = "core_pattern", 373 .data = core_pattern, 374 .maxlen = CORENAME_MAX_SIZE, 375 .mode = 0644, 376 .proc_handler = &proc_dostring, 377 .strategy = &sysctl_string, 378 }, 379 #ifdef CONFIG_PROC_SYSCTL 380 { 381 .procname = "tainted", 382 .data = &tainted, 383 .maxlen = sizeof(int), 384 .mode = 0644, 385 .proc_handler = &proc_dointvec_taint, 386 }, 387 #endif 388 #ifdef CONFIG_LATENCYTOP 389 { 390 .procname = "latencytop", 391 .data = &latencytop_enabled, 392 .maxlen = sizeof(int), 393 .mode = 0644, 394 .proc_handler = &proc_dointvec, 395 }, 396 #endif 397 #ifdef CONFIG_BLK_DEV_INITRD 398 { 399 .ctl_name = KERN_REALROOTDEV, 400 .procname = "real-root-dev", 401 .data = &real_root_dev, 402 .maxlen = sizeof(int), 403 .mode = 0644, 404 .proc_handler = &proc_dointvec, 405 }, 406 #endif 407 { 408 .ctl_name = CTL_UNNUMBERED, 409 .procname = "print-fatal-signals", 410 .data = &print_fatal_signals, 411 .maxlen = sizeof(int), 412 .mode = 0644, 413 .proc_handler = &proc_dointvec, 414 }, 415 #ifdef __sparc__ 416 { 417 .ctl_name = KERN_SPARC_REBOOT, 418 .procname = "reboot-cmd", 419 .data = reboot_command, 420 .maxlen = 256, 421 .mode = 0644, 422 .proc_handler = &proc_dostring, 423 .strategy = &sysctl_string, 424 }, 425 { 426 .ctl_name = KERN_SPARC_STOP_A, 427 .procname = "stop-a", 428 .data = &stop_a_enabled, 429 .maxlen = sizeof (int), 430 .mode = 0644, 431 .proc_handler = &proc_dointvec, 432 }, 433 { 434 .ctl_name = KERN_SPARC_SCONS_PWROFF, 435 .procname = "scons-poweroff", 436 .data = &scons_pwroff, 437 .maxlen = sizeof (int), 438 .mode = 0644, 439 .proc_handler = &proc_dointvec, 440 }, 441 #endif 442 #ifdef __hppa__ 443 { 444 .ctl_name = KERN_HPPA_PWRSW, 445 .procname = "soft-power", 446 .data = &pwrsw_enabled, 447 .maxlen = sizeof (int), 448 .mode = 0644, 449 .proc_handler = &proc_dointvec, 450 }, 451 { 452 .ctl_name = KERN_HPPA_UNALIGNED, 453 .procname = "unaligned-trap", 454 .data = &unaligned_enabled, 455 .maxlen = sizeof (int), 456 .mode = 0644, 457 .proc_handler = &proc_dointvec, 458 }, 459 #endif 460 { 461 .ctl_name = KERN_CTLALTDEL, 462 .procname = "ctrl-alt-del", 463 .data = &C_A_D, 464 .maxlen = sizeof(int), 465 .mode = 0644, 466 .proc_handler = &proc_dointvec, 467 }, 468 #ifdef CONFIG_FTRACE 469 { 470 .ctl_name = CTL_UNNUMBERED, 471 .procname = "ftrace_enabled", 472 .data = &ftrace_enabled, 473 .maxlen = sizeof(int), 474 .mode = 0644, 475 .proc_handler = &ftrace_enable_sysctl, 476 }, 477 #endif 478 #ifdef CONFIG_KMOD 479 { 480 .ctl_name = KERN_MODPROBE, 481 .procname = "modprobe", 482 .data = &modprobe_path, 483 .maxlen = KMOD_PATH_LEN, 484 .mode = 0644, 485 .proc_handler = &proc_dostring, 486 .strategy = &sysctl_string, 487 }, 488 #endif 489 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) 490 { 491 .ctl_name = KERN_HOTPLUG, 492 .procname = "hotplug", 493 .data = &uevent_helper, 494 .maxlen = UEVENT_HELPER_PATH_LEN, 495 .mode = 0644, 496 .proc_handler = &proc_dostring, 497 .strategy = &sysctl_string, 498 }, 499 #endif 500 #ifdef CONFIG_CHR_DEV_SG 501 { 502 .ctl_name = KERN_SG_BIG_BUFF, 503 .procname = "sg-big-buff", 504 .data = &sg_big_buff, 505 .maxlen = sizeof (int), 506 .mode = 0444, 507 .proc_handler = &proc_dointvec, 508 }, 509 #endif 510 #ifdef CONFIG_BSD_PROCESS_ACCT 511 { 512 .ctl_name = KERN_ACCT, 513 .procname = "acct", 514 .data = &acct_parm, 515 .maxlen = 3*sizeof(int), 516 .mode = 0644, 517 .proc_handler = &proc_dointvec, 518 }, 519 #endif 520 #ifdef CONFIG_MAGIC_SYSRQ 521 { 522 .ctl_name = KERN_SYSRQ, 523 .procname = "sysrq", 524 .data = &__sysrq_enabled, 525 .maxlen = sizeof (int), 526 .mode = 0644, 527 .proc_handler = &proc_dointvec, 528 }, 529 #endif 530 #ifdef CONFIG_PROC_SYSCTL 531 { 532 .procname = "cad_pid", 533 .data = NULL, 534 .maxlen = sizeof (int), 535 .mode = 0600, 536 .proc_handler = &proc_do_cad_pid, 537 }, 538 #endif 539 { 540 .ctl_name = KERN_MAX_THREADS, 541 .procname = "threads-max", 542 .data = &max_threads, 543 .maxlen = sizeof(int), 544 .mode = 0644, 545 .proc_handler = &proc_dointvec, 546 }, 547 { 548 .ctl_name = KERN_RANDOM, 549 .procname = "random", 550 .mode = 0555, 551 .child = random_table, 552 }, 553 { 554 .ctl_name = KERN_OVERFLOWUID, 555 .procname = "overflowuid", 556 .data = &overflowuid, 557 .maxlen = sizeof(int), 558 .mode = 0644, 559 .proc_handler = &proc_dointvec_minmax, 560 .strategy = &sysctl_intvec, 561 .extra1 = &minolduid, 562 .extra2 = &maxolduid, 563 }, 564 { 565 .ctl_name = KERN_OVERFLOWGID, 566 .procname = "overflowgid", 567 .data = &overflowgid, 568 .maxlen = sizeof(int), 569 .mode = 0644, 570 .proc_handler = &proc_dointvec_minmax, 571 .strategy = &sysctl_intvec, 572 .extra1 = &minolduid, 573 .extra2 = &maxolduid, 574 }, 575 #ifdef CONFIG_S390 576 #ifdef CONFIG_MATHEMU 577 { 578 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 579 .procname = "ieee_emulation_warnings", 580 .data = &sysctl_ieee_emulation_warnings, 581 .maxlen = sizeof(int), 582 .mode = 0644, 583 .proc_handler = &proc_dointvec, 584 }, 585 #endif 586 { 587 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 588 .procname = "userprocess_debug", 589 .data = &sysctl_userprocess_debug, 590 .maxlen = sizeof(int), 591 .mode = 0644, 592 .proc_handler = &proc_dointvec, 593 }, 594 #endif 595 { 596 .ctl_name = KERN_PIDMAX, 597 .procname = "pid_max", 598 .data = &pid_max, 599 .maxlen = sizeof (int), 600 .mode = 0644, 601 .proc_handler = &proc_dointvec_minmax, 602 .strategy = sysctl_intvec, 603 .extra1 = &pid_max_min, 604 .extra2 = &pid_max_max, 605 }, 606 { 607 .ctl_name = KERN_PANIC_ON_OOPS, 608 .procname = "panic_on_oops", 609 .data = &panic_on_oops, 610 .maxlen = sizeof(int), 611 .mode = 0644, 612 .proc_handler = &proc_dointvec, 613 }, 614 #if defined CONFIG_PRINTK 615 { 616 .ctl_name = KERN_PRINTK, 617 .procname = "printk", 618 .data = &console_loglevel, 619 .maxlen = 4*sizeof(int), 620 .mode = 0644, 621 .proc_handler = &proc_dointvec, 622 }, 623 { 624 .ctl_name = KERN_PRINTK_RATELIMIT, 625 .procname = "printk_ratelimit", 626 .data = &printk_ratelimit_jiffies, 627 .maxlen = sizeof(int), 628 .mode = 0644, 629 .proc_handler = &proc_dointvec_jiffies, 630 .strategy = &sysctl_jiffies, 631 }, 632 { 633 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 634 .procname = "printk_ratelimit_burst", 635 .data = &printk_ratelimit_burst, 636 .maxlen = sizeof(int), 637 .mode = 0644, 638 .proc_handler = &proc_dointvec, 639 }, 640 #endif 641 { 642 .ctl_name = KERN_NGROUPS_MAX, 643 .procname = "ngroups_max", 644 .data = &ngroups_max, 645 .maxlen = sizeof (int), 646 .mode = 0444, 647 .proc_handler = &proc_dointvec, 648 }, 649 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 650 { 651 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 652 .procname = "unknown_nmi_panic", 653 .data = &unknown_nmi_panic, 654 .maxlen = sizeof (int), 655 .mode = 0644, 656 .proc_handler = &proc_dointvec, 657 }, 658 { 659 .procname = "nmi_watchdog", 660 .data = &nmi_watchdog_enabled, 661 .maxlen = sizeof (int), 662 .mode = 0644, 663 .proc_handler = &proc_nmi_enabled, 664 }, 665 #endif 666 #if defined(CONFIG_X86) 667 { 668 .ctl_name = KERN_PANIC_ON_NMI, 669 .procname = "panic_on_unrecovered_nmi", 670 .data = &panic_on_unrecovered_nmi, 671 .maxlen = sizeof(int), 672 .mode = 0644, 673 .proc_handler = &proc_dointvec, 674 }, 675 { 676 .ctl_name = KERN_BOOTLOADER_TYPE, 677 .procname = "bootloader_type", 678 .data = &bootloader_type, 679 .maxlen = sizeof (int), 680 .mode = 0444, 681 .proc_handler = &proc_dointvec, 682 }, 683 { 684 .ctl_name = CTL_UNNUMBERED, 685 .procname = "kstack_depth_to_print", 686 .data = &kstack_depth_to_print, 687 .maxlen = sizeof(int), 688 .mode = 0644, 689 .proc_handler = &proc_dointvec, 690 }, 691 { 692 .ctl_name = CTL_UNNUMBERED, 693 .procname = "io_delay_type", 694 .data = &io_delay_type, 695 .maxlen = sizeof(int), 696 .mode = 0644, 697 .proc_handler = &proc_dointvec, 698 }, 699 #endif 700 #if defined(CONFIG_MMU) 701 { 702 .ctl_name = KERN_RANDOMIZE, 703 .procname = "randomize_va_space", 704 .data = &randomize_va_space, 705 .maxlen = sizeof(int), 706 .mode = 0644, 707 .proc_handler = &proc_dointvec, 708 }, 709 #endif 710 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 711 { 712 .ctl_name = KERN_SPIN_RETRY, 713 .procname = "spin_retry", 714 .data = &spin_retry, 715 .maxlen = sizeof (int), 716 .mode = 0644, 717 .proc_handler = &proc_dointvec, 718 }, 719 #endif 720 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 721 { 722 .procname = "acpi_video_flags", 723 .data = &acpi_realmode_flags, 724 .maxlen = sizeof (unsigned long), 725 .mode = 0644, 726 .proc_handler = &proc_doulongvec_minmax, 727 }, 728 #endif 729 #ifdef CONFIG_IA64 730 { 731 .ctl_name = KERN_IA64_UNALIGNED, 732 .procname = "ignore-unaligned-usertrap", 733 .data = &no_unaligned_warning, 734 .maxlen = sizeof (int), 735 .mode = 0644, 736 .proc_handler = &proc_dointvec, 737 }, 738 #endif 739 #ifdef CONFIG_DETECT_SOFTLOCKUP 740 { 741 .ctl_name = CTL_UNNUMBERED, 742 .procname = "softlockup_thresh", 743 .data = &softlockup_thresh, 744 .maxlen = sizeof(unsigned long), 745 .mode = 0644, 746 .proc_handler = &proc_doulongvec_minmax, 747 .strategy = &sysctl_intvec, 748 .extra1 = &one, 749 .extra2 = &sixty, 750 }, 751 { 752 .ctl_name = CTL_UNNUMBERED, 753 .procname = "hung_task_check_count", 754 .data = &sysctl_hung_task_check_count, 755 .maxlen = sizeof(unsigned long), 756 .mode = 0644, 757 .proc_handler = &proc_doulongvec_minmax, 758 .strategy = &sysctl_intvec, 759 }, 760 { 761 .ctl_name = CTL_UNNUMBERED, 762 .procname = "hung_task_timeout_secs", 763 .data = &sysctl_hung_task_timeout_secs, 764 .maxlen = sizeof(unsigned long), 765 .mode = 0644, 766 .proc_handler = &proc_doulongvec_minmax, 767 .strategy = &sysctl_intvec, 768 }, 769 { 770 .ctl_name = CTL_UNNUMBERED, 771 .procname = "hung_task_warnings", 772 .data = &sysctl_hung_task_warnings, 773 .maxlen = sizeof(unsigned long), 774 .mode = 0644, 775 .proc_handler = &proc_doulongvec_minmax, 776 .strategy = &sysctl_intvec, 777 }, 778 #endif 779 #ifdef CONFIG_COMPAT 780 { 781 .ctl_name = KERN_COMPAT_LOG, 782 .procname = "compat-log", 783 .data = &compat_log, 784 .maxlen = sizeof (int), 785 .mode = 0644, 786 .proc_handler = &proc_dointvec, 787 }, 788 #endif 789 #ifdef CONFIG_RT_MUTEXES 790 { 791 .ctl_name = KERN_MAX_LOCK_DEPTH, 792 .procname = "max_lock_depth", 793 .data = &max_lock_depth, 794 .maxlen = sizeof(int), 795 .mode = 0644, 796 .proc_handler = &proc_dointvec, 797 }, 798 #endif 799 #ifdef CONFIG_PROC_FS 800 { 801 .ctl_name = CTL_UNNUMBERED, 802 .procname = "maps_protect", 803 .data = &maps_protect, 804 .maxlen = sizeof(int), 805 .mode = 0644, 806 .proc_handler = &proc_dointvec, 807 }, 808 #endif 809 { 810 .ctl_name = CTL_UNNUMBERED, 811 .procname = "poweroff_cmd", 812 .data = &poweroff_cmd, 813 .maxlen = POWEROFF_CMD_PATH_LEN, 814 .mode = 0644, 815 .proc_handler = &proc_dostring, 816 .strategy = &sysctl_string, 817 }, 818 #ifdef CONFIG_KEYS 819 { 820 .ctl_name = CTL_UNNUMBERED, 821 .procname = "keys", 822 .mode = 0555, 823 .child = key_sysctls, 824 }, 825 #endif 826 #ifdef CONFIG_RCU_TORTURE_TEST 827 { 828 .ctl_name = CTL_UNNUMBERED, 829 .procname = "rcutorture_runnable", 830 .data = &rcutorture_runnable, 831 .maxlen = sizeof(int), 832 .mode = 0644, 833 .proc_handler = &proc_dointvec, 834 }, 835 #endif 836 /* 837 * NOTE: do not add new entries to this table unless you have read 838 * Documentation/sysctl/ctl_unnumbered.txt 839 */ 840 { .ctl_name = 0 } 841 }; 842 843 static struct ctl_table vm_table[] = { 844 { 845 .ctl_name = VM_OVERCOMMIT_MEMORY, 846 .procname = "overcommit_memory", 847 .data = &sysctl_overcommit_memory, 848 .maxlen = sizeof(sysctl_overcommit_memory), 849 .mode = 0644, 850 .proc_handler = &proc_dointvec, 851 }, 852 { 853 .ctl_name = VM_PANIC_ON_OOM, 854 .procname = "panic_on_oom", 855 .data = &sysctl_panic_on_oom, 856 .maxlen = sizeof(sysctl_panic_on_oom), 857 .mode = 0644, 858 .proc_handler = &proc_dointvec, 859 }, 860 { 861 .ctl_name = CTL_UNNUMBERED, 862 .procname = "oom_kill_allocating_task", 863 .data = &sysctl_oom_kill_allocating_task, 864 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 865 .mode = 0644, 866 .proc_handler = &proc_dointvec, 867 }, 868 { 869 .ctl_name = CTL_UNNUMBERED, 870 .procname = "oom_dump_tasks", 871 .data = &sysctl_oom_dump_tasks, 872 .maxlen = sizeof(sysctl_oom_dump_tasks), 873 .mode = 0644, 874 .proc_handler = &proc_dointvec, 875 }, 876 { 877 .ctl_name = VM_OVERCOMMIT_RATIO, 878 .procname = "overcommit_ratio", 879 .data = &sysctl_overcommit_ratio, 880 .maxlen = sizeof(sysctl_overcommit_ratio), 881 .mode = 0644, 882 .proc_handler = &proc_dointvec, 883 }, 884 { 885 .ctl_name = VM_PAGE_CLUSTER, 886 .procname = "page-cluster", 887 .data = &page_cluster, 888 .maxlen = sizeof(int), 889 .mode = 0644, 890 .proc_handler = &proc_dointvec, 891 }, 892 { 893 .ctl_name = VM_DIRTY_BACKGROUND, 894 .procname = "dirty_background_ratio", 895 .data = &dirty_background_ratio, 896 .maxlen = sizeof(dirty_background_ratio), 897 .mode = 0644, 898 .proc_handler = &proc_dointvec_minmax, 899 .strategy = &sysctl_intvec, 900 .extra1 = &zero, 901 .extra2 = &one_hundred, 902 }, 903 { 904 .ctl_name = VM_DIRTY_RATIO, 905 .procname = "dirty_ratio", 906 .data = &vm_dirty_ratio, 907 .maxlen = sizeof(vm_dirty_ratio), 908 .mode = 0644, 909 .proc_handler = &dirty_ratio_handler, 910 .strategy = &sysctl_intvec, 911 .extra1 = &zero, 912 .extra2 = &one_hundred, 913 }, 914 { 915 .procname = "dirty_writeback_centisecs", 916 .data = &dirty_writeback_interval, 917 .maxlen = sizeof(dirty_writeback_interval), 918 .mode = 0644, 919 .proc_handler = &dirty_writeback_centisecs_handler, 920 }, 921 { 922 .procname = "dirty_expire_centisecs", 923 .data = &dirty_expire_interval, 924 .maxlen = sizeof(dirty_expire_interval), 925 .mode = 0644, 926 .proc_handler = &proc_dointvec_userhz_jiffies, 927 }, 928 { 929 .ctl_name = VM_NR_PDFLUSH_THREADS, 930 .procname = "nr_pdflush_threads", 931 .data = &nr_pdflush_threads, 932 .maxlen = sizeof nr_pdflush_threads, 933 .mode = 0444 /* read-only*/, 934 .proc_handler = &proc_dointvec, 935 }, 936 { 937 .ctl_name = VM_SWAPPINESS, 938 .procname = "swappiness", 939 .data = &vm_swappiness, 940 .maxlen = sizeof(vm_swappiness), 941 .mode = 0644, 942 .proc_handler = &proc_dointvec_minmax, 943 .strategy = &sysctl_intvec, 944 .extra1 = &zero, 945 .extra2 = &one_hundred, 946 }, 947 #ifdef CONFIG_HUGETLB_PAGE 948 { 949 .procname = "nr_hugepages", 950 .data = &max_huge_pages, 951 .maxlen = sizeof(unsigned long), 952 .mode = 0644, 953 .proc_handler = &hugetlb_sysctl_handler, 954 .extra1 = (void *)&hugetlb_zero, 955 .extra2 = (void *)&hugetlb_infinity, 956 }, 957 { 958 .ctl_name = VM_HUGETLB_GROUP, 959 .procname = "hugetlb_shm_group", 960 .data = &sysctl_hugetlb_shm_group, 961 .maxlen = sizeof(gid_t), 962 .mode = 0644, 963 .proc_handler = &proc_dointvec, 964 }, 965 { 966 .ctl_name = CTL_UNNUMBERED, 967 .procname = "hugepages_treat_as_movable", 968 .data = &hugepages_treat_as_movable, 969 .maxlen = sizeof(int), 970 .mode = 0644, 971 .proc_handler = &hugetlb_treat_movable_handler, 972 }, 973 { 974 .ctl_name = CTL_UNNUMBERED, 975 .procname = "nr_overcommit_hugepages", 976 .data = &sysctl_overcommit_huge_pages, 977 .maxlen = sizeof(sysctl_overcommit_huge_pages), 978 .mode = 0644, 979 .proc_handler = &hugetlb_overcommit_handler, 980 }, 981 #endif 982 { 983 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 984 .procname = "lowmem_reserve_ratio", 985 .data = &sysctl_lowmem_reserve_ratio, 986 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 987 .mode = 0644, 988 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 989 .strategy = &sysctl_intvec, 990 }, 991 { 992 .ctl_name = VM_DROP_PAGECACHE, 993 .procname = "drop_caches", 994 .data = &sysctl_drop_caches, 995 .maxlen = sizeof(int), 996 .mode = 0644, 997 .proc_handler = drop_caches_sysctl_handler, 998 .strategy = &sysctl_intvec, 999 }, 1000 { 1001 .ctl_name = VM_MIN_FREE_KBYTES, 1002 .procname = "min_free_kbytes", 1003 .data = &min_free_kbytes, 1004 .maxlen = sizeof(min_free_kbytes), 1005 .mode = 0644, 1006 .proc_handler = &min_free_kbytes_sysctl_handler, 1007 .strategy = &sysctl_intvec, 1008 .extra1 = &zero, 1009 }, 1010 { 1011 .ctl_name = VM_PERCPU_PAGELIST_FRACTION, 1012 .procname = "percpu_pagelist_fraction", 1013 .data = &percpu_pagelist_fraction, 1014 .maxlen = sizeof(percpu_pagelist_fraction), 1015 .mode = 0644, 1016 .proc_handler = &percpu_pagelist_fraction_sysctl_handler, 1017 .strategy = &sysctl_intvec, 1018 .extra1 = &min_percpu_pagelist_fract, 1019 }, 1020 #ifdef CONFIG_MMU 1021 { 1022 .ctl_name = VM_MAX_MAP_COUNT, 1023 .procname = "max_map_count", 1024 .data = &sysctl_max_map_count, 1025 .maxlen = sizeof(sysctl_max_map_count), 1026 .mode = 0644, 1027 .proc_handler = &proc_dointvec 1028 }, 1029 #endif 1030 { 1031 .ctl_name = VM_LAPTOP_MODE, 1032 .procname = "laptop_mode", 1033 .data = &laptop_mode, 1034 .maxlen = sizeof(laptop_mode), 1035 .mode = 0644, 1036 .proc_handler = &proc_dointvec_jiffies, 1037 .strategy = &sysctl_jiffies, 1038 }, 1039 { 1040 .ctl_name = VM_BLOCK_DUMP, 1041 .procname = "block_dump", 1042 .data = &block_dump, 1043 .maxlen = sizeof(block_dump), 1044 .mode = 0644, 1045 .proc_handler = &proc_dointvec, 1046 .strategy = &sysctl_intvec, 1047 .extra1 = &zero, 1048 }, 1049 { 1050 .ctl_name = VM_VFS_CACHE_PRESSURE, 1051 .procname = "vfs_cache_pressure", 1052 .data = &sysctl_vfs_cache_pressure, 1053 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1054 .mode = 0644, 1055 .proc_handler = &proc_dointvec, 1056 .strategy = &sysctl_intvec, 1057 .extra1 = &zero, 1058 }, 1059 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1060 { 1061 .ctl_name = VM_LEGACY_VA_LAYOUT, 1062 .procname = "legacy_va_layout", 1063 .data = &sysctl_legacy_va_layout, 1064 .maxlen = sizeof(sysctl_legacy_va_layout), 1065 .mode = 0644, 1066 .proc_handler = &proc_dointvec, 1067 .strategy = &sysctl_intvec, 1068 .extra1 = &zero, 1069 }, 1070 #endif 1071 #ifdef CONFIG_NUMA 1072 { 1073 .ctl_name = VM_ZONE_RECLAIM_MODE, 1074 .procname = "zone_reclaim_mode", 1075 .data = &zone_reclaim_mode, 1076 .maxlen = sizeof(zone_reclaim_mode), 1077 .mode = 0644, 1078 .proc_handler = &proc_dointvec, 1079 .strategy = &sysctl_intvec, 1080 .extra1 = &zero, 1081 }, 1082 { 1083 .ctl_name = VM_MIN_UNMAPPED, 1084 .procname = "min_unmapped_ratio", 1085 .data = &sysctl_min_unmapped_ratio, 1086 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1087 .mode = 0644, 1088 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, 1089 .strategy = &sysctl_intvec, 1090 .extra1 = &zero, 1091 .extra2 = &one_hundred, 1092 }, 1093 { 1094 .ctl_name = VM_MIN_SLAB, 1095 .procname = "min_slab_ratio", 1096 .data = &sysctl_min_slab_ratio, 1097 .maxlen = sizeof(sysctl_min_slab_ratio), 1098 .mode = 0644, 1099 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, 1100 .strategy = &sysctl_intvec, 1101 .extra1 = &zero, 1102 .extra2 = &one_hundred, 1103 }, 1104 #endif 1105 #ifdef CONFIG_SMP 1106 { 1107 .ctl_name = CTL_UNNUMBERED, 1108 .procname = "stat_interval", 1109 .data = &sysctl_stat_interval, 1110 .maxlen = sizeof(sysctl_stat_interval), 1111 .mode = 0644, 1112 .proc_handler = &proc_dointvec_jiffies, 1113 .strategy = &sysctl_jiffies, 1114 }, 1115 #endif 1116 #ifdef CONFIG_SECURITY 1117 { 1118 .ctl_name = CTL_UNNUMBERED, 1119 .procname = "mmap_min_addr", 1120 .data = &mmap_min_addr, 1121 .maxlen = sizeof(unsigned long), 1122 .mode = 0644, 1123 .proc_handler = &proc_doulongvec_minmax, 1124 }, 1125 #endif 1126 #ifdef CONFIG_NUMA 1127 { 1128 .ctl_name = CTL_UNNUMBERED, 1129 .procname = "numa_zonelist_order", 1130 .data = &numa_zonelist_order, 1131 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1132 .mode = 0644, 1133 .proc_handler = &numa_zonelist_order_handler, 1134 .strategy = &sysctl_string, 1135 }, 1136 #endif 1137 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1138 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1139 { 1140 .ctl_name = VM_VDSO_ENABLED, 1141 .procname = "vdso_enabled", 1142 .data = &vdso_enabled, 1143 .maxlen = sizeof(vdso_enabled), 1144 .mode = 0644, 1145 .proc_handler = &proc_dointvec, 1146 .strategy = &sysctl_intvec, 1147 .extra1 = &zero, 1148 }, 1149 #endif 1150 #ifdef CONFIG_HIGHMEM 1151 { 1152 .ctl_name = CTL_UNNUMBERED, 1153 .procname = "highmem_is_dirtyable", 1154 .data = &vm_highmem_is_dirtyable, 1155 .maxlen = sizeof(vm_highmem_is_dirtyable), 1156 .mode = 0644, 1157 .proc_handler = &proc_dointvec_minmax, 1158 .strategy = &sysctl_intvec, 1159 .extra1 = &zero, 1160 .extra2 = &one, 1161 }, 1162 #endif 1163 /* 1164 * NOTE: do not add new entries to this table unless you have read 1165 * Documentation/sysctl/ctl_unnumbered.txt 1166 */ 1167 { .ctl_name = 0 } 1168 }; 1169 1170 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1171 static struct ctl_table binfmt_misc_table[] = { 1172 { .ctl_name = 0 } 1173 }; 1174 #endif 1175 1176 static struct ctl_table fs_table[] = { 1177 { 1178 .ctl_name = FS_NRINODE, 1179 .procname = "inode-nr", 1180 .data = &inodes_stat, 1181 .maxlen = 2*sizeof(int), 1182 .mode = 0444, 1183 .proc_handler = &proc_dointvec, 1184 }, 1185 { 1186 .ctl_name = FS_STATINODE, 1187 .procname = "inode-state", 1188 .data = &inodes_stat, 1189 .maxlen = 7*sizeof(int), 1190 .mode = 0444, 1191 .proc_handler = &proc_dointvec, 1192 }, 1193 { 1194 .procname = "file-nr", 1195 .data = &files_stat, 1196 .maxlen = 3*sizeof(int), 1197 .mode = 0444, 1198 .proc_handler = &proc_nr_files, 1199 }, 1200 { 1201 .ctl_name = FS_MAXFILE, 1202 .procname = "file-max", 1203 .data = &files_stat.max_files, 1204 .maxlen = sizeof(int), 1205 .mode = 0644, 1206 .proc_handler = &proc_dointvec, 1207 }, 1208 { 1209 .ctl_name = CTL_UNNUMBERED, 1210 .procname = "nr_open", 1211 .data = &sysctl_nr_open, 1212 .maxlen = sizeof(int), 1213 .mode = 0644, 1214 .proc_handler = &proc_dointvec_minmax, 1215 .extra1 = &sysctl_nr_open_min, 1216 .extra2 = &sysctl_nr_open_max, 1217 }, 1218 { 1219 .ctl_name = FS_DENTRY, 1220 .procname = "dentry-state", 1221 .data = &dentry_stat, 1222 .maxlen = 6*sizeof(int), 1223 .mode = 0444, 1224 .proc_handler = &proc_dointvec, 1225 }, 1226 { 1227 .ctl_name = FS_OVERFLOWUID, 1228 .procname = "overflowuid", 1229 .data = &fs_overflowuid, 1230 .maxlen = sizeof(int), 1231 .mode = 0644, 1232 .proc_handler = &proc_dointvec_minmax, 1233 .strategy = &sysctl_intvec, 1234 .extra1 = &minolduid, 1235 .extra2 = &maxolduid, 1236 }, 1237 { 1238 .ctl_name = FS_OVERFLOWGID, 1239 .procname = "overflowgid", 1240 .data = &fs_overflowgid, 1241 .maxlen = sizeof(int), 1242 .mode = 0644, 1243 .proc_handler = &proc_dointvec_minmax, 1244 .strategy = &sysctl_intvec, 1245 .extra1 = &minolduid, 1246 .extra2 = &maxolduid, 1247 }, 1248 { 1249 .ctl_name = FS_LEASES, 1250 .procname = "leases-enable", 1251 .data = &leases_enable, 1252 .maxlen = sizeof(int), 1253 .mode = 0644, 1254 .proc_handler = &proc_dointvec, 1255 }, 1256 #ifdef CONFIG_DNOTIFY 1257 { 1258 .ctl_name = FS_DIR_NOTIFY, 1259 .procname = "dir-notify-enable", 1260 .data = &dir_notify_enable, 1261 .maxlen = sizeof(int), 1262 .mode = 0644, 1263 .proc_handler = &proc_dointvec, 1264 }, 1265 #endif 1266 #ifdef CONFIG_MMU 1267 { 1268 .ctl_name = FS_LEASE_TIME, 1269 .procname = "lease-break-time", 1270 .data = &lease_break_time, 1271 .maxlen = sizeof(int), 1272 .mode = 0644, 1273 .proc_handler = &proc_dointvec_minmax, 1274 .strategy = &sysctl_intvec, 1275 .extra1 = &zero, 1276 .extra2 = &two, 1277 }, 1278 { 1279 .procname = "aio-nr", 1280 .data = &aio_nr, 1281 .maxlen = sizeof(aio_nr), 1282 .mode = 0444, 1283 .proc_handler = &proc_doulongvec_minmax, 1284 }, 1285 { 1286 .procname = "aio-max-nr", 1287 .data = &aio_max_nr, 1288 .maxlen = sizeof(aio_max_nr), 1289 .mode = 0644, 1290 .proc_handler = &proc_doulongvec_minmax, 1291 }, 1292 #ifdef CONFIG_INOTIFY_USER 1293 { 1294 .ctl_name = FS_INOTIFY, 1295 .procname = "inotify", 1296 .mode = 0555, 1297 .child = inotify_table, 1298 }, 1299 #endif 1300 #endif 1301 { 1302 .ctl_name = KERN_SETUID_DUMPABLE, 1303 .procname = "suid_dumpable", 1304 .data = &suid_dumpable, 1305 .maxlen = sizeof(int), 1306 .mode = 0644, 1307 .proc_handler = &proc_dointvec, 1308 }, 1309 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1310 { 1311 .ctl_name = CTL_UNNUMBERED, 1312 .procname = "binfmt_misc", 1313 .mode = 0555, 1314 .child = binfmt_misc_table, 1315 }, 1316 #endif 1317 /* 1318 * NOTE: do not add new entries to this table unless you have read 1319 * Documentation/sysctl/ctl_unnumbered.txt 1320 */ 1321 { .ctl_name = 0 } 1322 }; 1323 1324 static struct ctl_table debug_table[] = { 1325 #if defined(CONFIG_X86) || defined(CONFIG_PPC) 1326 { 1327 .ctl_name = CTL_UNNUMBERED, 1328 .procname = "exception-trace", 1329 .data = &show_unhandled_signals, 1330 .maxlen = sizeof(int), 1331 .mode = 0644, 1332 .proc_handler = proc_dointvec 1333 }, 1334 #endif 1335 { .ctl_name = 0 } 1336 }; 1337 1338 static struct ctl_table dev_table[] = { 1339 { .ctl_name = 0 } 1340 }; 1341 1342 static DEFINE_SPINLOCK(sysctl_lock); 1343 1344 /* called under sysctl_lock */ 1345 static int use_table(struct ctl_table_header *p) 1346 { 1347 if (unlikely(p->unregistering)) 1348 return 0; 1349 p->used++; 1350 return 1; 1351 } 1352 1353 /* called under sysctl_lock */ 1354 static void unuse_table(struct ctl_table_header *p) 1355 { 1356 if (!--p->used) 1357 if (unlikely(p->unregistering)) 1358 complete(p->unregistering); 1359 } 1360 1361 /* called under sysctl_lock, will reacquire if has to wait */ 1362 static void start_unregistering(struct ctl_table_header *p) 1363 { 1364 /* 1365 * if p->used is 0, nobody will ever touch that entry again; 1366 * we'll eliminate all paths to it before dropping sysctl_lock 1367 */ 1368 if (unlikely(p->used)) { 1369 struct completion wait; 1370 init_completion(&wait); 1371 p->unregistering = &wait; 1372 spin_unlock(&sysctl_lock); 1373 wait_for_completion(&wait); 1374 spin_lock(&sysctl_lock); 1375 } 1376 /* 1377 * do not remove from the list until nobody holds it; walking the 1378 * list in do_sysctl() relies on that. 1379 */ 1380 list_del_init(&p->ctl_entry); 1381 } 1382 1383 void sysctl_head_finish(struct ctl_table_header *head) 1384 { 1385 if (!head) 1386 return; 1387 spin_lock(&sysctl_lock); 1388 unuse_table(head); 1389 spin_unlock(&sysctl_lock); 1390 } 1391 1392 static struct list_head * 1393 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1394 { 1395 struct list_head *header_list; 1396 header_list = &root->header_list; 1397 if (root->lookup) 1398 header_list = root->lookup(root, namespaces); 1399 return header_list; 1400 } 1401 1402 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1403 struct ctl_table_header *prev) 1404 { 1405 struct ctl_table_root *root; 1406 struct list_head *header_list; 1407 struct ctl_table_header *head; 1408 struct list_head *tmp; 1409 1410 spin_lock(&sysctl_lock); 1411 if (prev) { 1412 head = prev; 1413 tmp = &prev->ctl_entry; 1414 unuse_table(prev); 1415 goto next; 1416 } 1417 tmp = &root_table_header.ctl_entry; 1418 for (;;) { 1419 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1420 1421 if (!use_table(head)) 1422 goto next; 1423 spin_unlock(&sysctl_lock); 1424 return head; 1425 next: 1426 root = head->root; 1427 tmp = tmp->next; 1428 header_list = lookup_header_list(root, namespaces); 1429 if (tmp != header_list) 1430 continue; 1431 1432 do { 1433 root = list_entry(root->root_list.next, 1434 struct ctl_table_root, root_list); 1435 if (root == &sysctl_table_root) 1436 goto out; 1437 header_list = lookup_header_list(root, namespaces); 1438 } while (list_empty(header_list)); 1439 tmp = header_list->next; 1440 } 1441 out: 1442 spin_unlock(&sysctl_lock); 1443 return NULL; 1444 } 1445 1446 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1447 { 1448 return __sysctl_head_next(current->nsproxy, prev); 1449 } 1450 1451 void register_sysctl_root(struct ctl_table_root *root) 1452 { 1453 spin_lock(&sysctl_lock); 1454 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1455 spin_unlock(&sysctl_lock); 1456 } 1457 1458 #ifdef CONFIG_SYSCTL_SYSCALL 1459 /* Perform the actual read/write of a sysctl table entry. */ 1460 static int do_sysctl_strategy(struct ctl_table_root *root, 1461 struct ctl_table *table, 1462 int __user *name, int nlen, 1463 void __user *oldval, size_t __user *oldlenp, 1464 void __user *newval, size_t newlen) 1465 { 1466 int op = 0, rc; 1467 1468 if (oldval) 1469 op |= 004; 1470 if (newval) 1471 op |= 002; 1472 if (sysctl_perm(root, table, op)) 1473 return -EPERM; 1474 1475 if (table->strategy) { 1476 rc = table->strategy(table, name, nlen, oldval, oldlenp, 1477 newval, newlen); 1478 if (rc < 0) 1479 return rc; 1480 if (rc > 0) 1481 return 0; 1482 } 1483 1484 /* If there is no strategy routine, or if the strategy returns 1485 * zero, proceed with automatic r/w */ 1486 if (table->data && table->maxlen) { 1487 rc = sysctl_data(table, name, nlen, oldval, oldlenp, 1488 newval, newlen); 1489 if (rc < 0) 1490 return rc; 1491 } 1492 return 0; 1493 } 1494 1495 static int parse_table(int __user *name, int nlen, 1496 void __user *oldval, size_t __user *oldlenp, 1497 void __user *newval, size_t newlen, 1498 struct ctl_table_root *root, 1499 struct ctl_table *table) 1500 { 1501 int n; 1502 repeat: 1503 if (!nlen) 1504 return -ENOTDIR; 1505 if (get_user(n, name)) 1506 return -EFAULT; 1507 for ( ; table->ctl_name || table->procname; table++) { 1508 if (!table->ctl_name) 1509 continue; 1510 if (n == table->ctl_name) { 1511 int error; 1512 if (table->child) { 1513 if (sysctl_perm(root, table, 001)) 1514 return -EPERM; 1515 name++; 1516 nlen--; 1517 table = table->child; 1518 goto repeat; 1519 } 1520 error = do_sysctl_strategy(root, table, name, nlen, 1521 oldval, oldlenp, 1522 newval, newlen); 1523 return error; 1524 } 1525 } 1526 return -ENOTDIR; 1527 } 1528 1529 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1530 void __user *newval, size_t newlen) 1531 { 1532 struct ctl_table_header *head; 1533 int error = -ENOTDIR; 1534 1535 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1536 return -ENOTDIR; 1537 if (oldval) { 1538 int old_len; 1539 if (!oldlenp || get_user(old_len, oldlenp)) 1540 return -EFAULT; 1541 } 1542 1543 for (head = sysctl_head_next(NULL); head; 1544 head = sysctl_head_next(head)) { 1545 error = parse_table(name, nlen, oldval, oldlenp, 1546 newval, newlen, 1547 head->root, head->ctl_table); 1548 if (error != -ENOTDIR) { 1549 sysctl_head_finish(head); 1550 break; 1551 } 1552 } 1553 return error; 1554 } 1555 1556 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 1557 { 1558 struct __sysctl_args tmp; 1559 int error; 1560 1561 if (copy_from_user(&tmp, args, sizeof(tmp))) 1562 return -EFAULT; 1563 1564 error = deprecated_sysctl_warning(&tmp); 1565 if (error) 1566 goto out; 1567 1568 lock_kernel(); 1569 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1570 tmp.newval, tmp.newlen); 1571 unlock_kernel(); 1572 out: 1573 return error; 1574 } 1575 #endif /* CONFIG_SYSCTL_SYSCALL */ 1576 1577 /* 1578 * sysctl_perm does NOT grant the superuser all rights automatically, because 1579 * some sysctl variables are readonly even to root. 1580 */ 1581 1582 static int test_perm(int mode, int op) 1583 { 1584 if (!current->euid) 1585 mode >>= 6; 1586 else if (in_egroup_p(0)) 1587 mode >>= 3; 1588 if ((mode & op & 0007) == op) 1589 return 0; 1590 return -EACCES; 1591 } 1592 1593 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1594 { 1595 int error; 1596 int mode; 1597 1598 error = security_sysctl(table, op); 1599 if (error) 1600 return error; 1601 1602 if (root->permissions) 1603 mode = root->permissions(root, current->nsproxy, table); 1604 else 1605 mode = table->mode; 1606 1607 return test_perm(mode, op); 1608 } 1609 1610 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1611 { 1612 for (; table->ctl_name || table->procname; table++) { 1613 table->parent = parent; 1614 if (table->child) 1615 sysctl_set_parent(table, table->child); 1616 } 1617 } 1618 1619 static __init int sysctl_init(void) 1620 { 1621 sysctl_set_parent(NULL, root_table); 1622 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1623 { 1624 int err; 1625 err = sysctl_check_table(current->nsproxy, root_table); 1626 } 1627 #endif 1628 return 0; 1629 } 1630 1631 core_initcall(sysctl_init); 1632 1633 /** 1634 * __register_sysctl_paths - register a sysctl hierarchy 1635 * @root: List of sysctl headers to register on 1636 * @namespaces: Data to compute which lists of sysctl entries are visible 1637 * @path: The path to the directory the sysctl table is in. 1638 * @table: the top-level table structure 1639 * 1640 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1641 * array. A completely 0 filled entry terminates the table. 1642 * 1643 * The members of the &struct ctl_table structure are used as follows: 1644 * 1645 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1646 * must be unique within that level of sysctl 1647 * 1648 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1649 * enter a sysctl file 1650 * 1651 * data - a pointer to data for use by proc_handler 1652 * 1653 * maxlen - the maximum size in bytes of the data 1654 * 1655 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1656 * 1657 * child - a pointer to the child sysctl table if this entry is a directory, or 1658 * %NULL. 1659 * 1660 * proc_handler - the text handler routine (described below) 1661 * 1662 * strategy - the strategy routine (described below) 1663 * 1664 * de - for internal use by the sysctl routines 1665 * 1666 * extra1, extra2 - extra pointers usable by the proc handler routines 1667 * 1668 * Leaf nodes in the sysctl tree will be represented by a single file 1669 * under /proc; non-leaf nodes will be represented by directories. 1670 * 1671 * sysctl(2) can automatically manage read and write requests through 1672 * the sysctl table. The data and maxlen fields of the ctl_table 1673 * struct enable minimal validation of the values being written to be 1674 * performed, and the mode field allows minimal authentication. 1675 * 1676 * More sophisticated management can be enabled by the provision of a 1677 * strategy routine with the table entry. This will be called before 1678 * any automatic read or write of the data is performed. 1679 * 1680 * The strategy routine may return 1681 * 1682 * < 0 - Error occurred (error is passed to user process) 1683 * 1684 * 0 - OK - proceed with automatic read or write. 1685 * 1686 * > 0 - OK - read or write has been done by the strategy routine, so 1687 * return immediately. 1688 * 1689 * There must be a proc_handler routine for any terminal nodes 1690 * mirrored under /proc/sys (non-terminals are handled by a built-in 1691 * directory handler). Several default handlers are available to 1692 * cover common cases - 1693 * 1694 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1695 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1696 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1697 * 1698 * It is the handler's job to read the input buffer from user memory 1699 * and process it. The handler should return 0 on success. 1700 * 1701 * This routine returns %NULL on a failure to register, and a pointer 1702 * to the table header on success. 1703 */ 1704 struct ctl_table_header *__register_sysctl_paths( 1705 struct ctl_table_root *root, 1706 struct nsproxy *namespaces, 1707 const struct ctl_path *path, struct ctl_table *table) 1708 { 1709 struct list_head *header_list; 1710 struct ctl_table_header *header; 1711 struct ctl_table *new, **prevp; 1712 unsigned int n, npath; 1713 1714 /* Count the path components */ 1715 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) 1716 ; 1717 1718 /* 1719 * For each path component, allocate a 2-element ctl_table array. 1720 * The first array element will be filled with the sysctl entry 1721 * for this, the second will be the sentinel (ctl_name == 0). 1722 * 1723 * We allocate everything in one go so that we don't have to 1724 * worry about freeing additional memory in unregister_sysctl_table. 1725 */ 1726 header = kzalloc(sizeof(struct ctl_table_header) + 1727 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1728 if (!header) 1729 return NULL; 1730 1731 new = (struct ctl_table *) (header + 1); 1732 1733 /* Now connect the dots */ 1734 prevp = &header->ctl_table; 1735 for (n = 0; n < npath; ++n, ++path) { 1736 /* Copy the procname */ 1737 new->procname = path->procname; 1738 new->ctl_name = path->ctl_name; 1739 new->mode = 0555; 1740 1741 *prevp = new; 1742 prevp = &new->child; 1743 1744 new += 2; 1745 } 1746 *prevp = table; 1747 header->ctl_table_arg = table; 1748 1749 INIT_LIST_HEAD(&header->ctl_entry); 1750 header->used = 0; 1751 header->unregistering = NULL; 1752 header->root = root; 1753 sysctl_set_parent(NULL, header->ctl_table); 1754 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1755 if (sysctl_check_table(namespaces, header->ctl_table)) { 1756 kfree(header); 1757 return NULL; 1758 } 1759 #endif 1760 spin_lock(&sysctl_lock); 1761 header_list = lookup_header_list(root, namespaces); 1762 list_add_tail(&header->ctl_entry, header_list); 1763 spin_unlock(&sysctl_lock); 1764 1765 return header; 1766 } 1767 1768 /** 1769 * register_sysctl_table_path - register a sysctl table hierarchy 1770 * @path: The path to the directory the sysctl table is in. 1771 * @table: the top-level table structure 1772 * 1773 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1774 * array. A completely 0 filled entry terminates the table. 1775 * 1776 * See __register_sysctl_paths for more details. 1777 */ 1778 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1779 struct ctl_table *table) 1780 { 1781 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1782 path, table); 1783 } 1784 1785 /** 1786 * register_sysctl_table - register a sysctl table hierarchy 1787 * @table: the top-level table structure 1788 * 1789 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1790 * array. A completely 0 filled entry terminates the table. 1791 * 1792 * See register_sysctl_paths for more details. 1793 */ 1794 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1795 { 1796 static const struct ctl_path null_path[] = { {} }; 1797 1798 return register_sysctl_paths(null_path, table); 1799 } 1800 1801 /** 1802 * unregister_sysctl_table - unregister a sysctl table hierarchy 1803 * @header: the header returned from register_sysctl_table 1804 * 1805 * Unregisters the sysctl table and all children. proc entries may not 1806 * actually be removed until they are no longer used by anyone. 1807 */ 1808 void unregister_sysctl_table(struct ctl_table_header * header) 1809 { 1810 might_sleep(); 1811 1812 if (header == NULL) 1813 return; 1814 1815 spin_lock(&sysctl_lock); 1816 start_unregistering(header); 1817 spin_unlock(&sysctl_lock); 1818 kfree(header); 1819 } 1820 1821 #else /* !CONFIG_SYSCTL */ 1822 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1823 { 1824 return NULL; 1825 } 1826 1827 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1828 struct ctl_table *table) 1829 { 1830 return NULL; 1831 } 1832 1833 void unregister_sysctl_table(struct ctl_table_header * table) 1834 { 1835 } 1836 1837 #endif /* CONFIG_SYSCTL */ 1838 1839 /* 1840 * /proc/sys support 1841 */ 1842 1843 #ifdef CONFIG_PROC_SYSCTL 1844 1845 static int _proc_do_string(void* data, int maxlen, int write, 1846 struct file *filp, void __user *buffer, 1847 size_t *lenp, loff_t *ppos) 1848 { 1849 size_t len; 1850 char __user *p; 1851 char c; 1852 1853 if (!data || !maxlen || !*lenp) { 1854 *lenp = 0; 1855 return 0; 1856 } 1857 1858 if (write) { 1859 len = 0; 1860 p = buffer; 1861 while (len < *lenp) { 1862 if (get_user(c, p++)) 1863 return -EFAULT; 1864 if (c == 0 || c == '\n') 1865 break; 1866 len++; 1867 } 1868 if (len >= maxlen) 1869 len = maxlen-1; 1870 if(copy_from_user(data, buffer, len)) 1871 return -EFAULT; 1872 ((char *) data)[len] = 0; 1873 *ppos += *lenp; 1874 } else { 1875 len = strlen(data); 1876 if (len > maxlen) 1877 len = maxlen; 1878 1879 if (*ppos > len) { 1880 *lenp = 0; 1881 return 0; 1882 } 1883 1884 data += *ppos; 1885 len -= *ppos; 1886 1887 if (len > *lenp) 1888 len = *lenp; 1889 if (len) 1890 if(copy_to_user(buffer, data, len)) 1891 return -EFAULT; 1892 if (len < *lenp) { 1893 if(put_user('\n', ((char __user *) buffer) + len)) 1894 return -EFAULT; 1895 len++; 1896 } 1897 *lenp = len; 1898 *ppos += len; 1899 } 1900 return 0; 1901 } 1902 1903 /** 1904 * proc_dostring - read a string sysctl 1905 * @table: the sysctl table 1906 * @write: %TRUE if this is a write to the sysctl file 1907 * @filp: the file structure 1908 * @buffer: the user buffer 1909 * @lenp: the size of the user buffer 1910 * @ppos: file position 1911 * 1912 * Reads/writes a string from/to the user buffer. If the kernel 1913 * buffer provided is not large enough to hold the string, the 1914 * string is truncated. The copied string is %NULL-terminated. 1915 * If the string is being read by the user process, it is copied 1916 * and a newline '\n' is added. It is truncated if the buffer is 1917 * not large enough. 1918 * 1919 * Returns 0 on success. 1920 */ 1921 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 1922 void __user *buffer, size_t *lenp, loff_t *ppos) 1923 { 1924 return _proc_do_string(table->data, table->maxlen, write, filp, 1925 buffer, lenp, ppos); 1926 } 1927 1928 1929 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 1930 int *valp, 1931 int write, void *data) 1932 { 1933 if (write) { 1934 *valp = *negp ? -*lvalp : *lvalp; 1935 } else { 1936 int val = *valp; 1937 if (val < 0) { 1938 *negp = -1; 1939 *lvalp = (unsigned long)-val; 1940 } else { 1941 *negp = 0; 1942 *lvalp = (unsigned long)val; 1943 } 1944 } 1945 return 0; 1946 } 1947 1948 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1949 int write, struct file *filp, void __user *buffer, 1950 size_t *lenp, loff_t *ppos, 1951 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 1952 int write, void *data), 1953 void *data) 1954 { 1955 #define TMPBUFLEN 21 1956 int *i, vleft, first=1, neg, val; 1957 unsigned long lval; 1958 size_t left, len; 1959 1960 char buf[TMPBUFLEN], *p; 1961 char __user *s = buffer; 1962 1963 if (!tbl_data || !table->maxlen || !*lenp || 1964 (*ppos && !write)) { 1965 *lenp = 0; 1966 return 0; 1967 } 1968 1969 i = (int *) tbl_data; 1970 vleft = table->maxlen / sizeof(*i); 1971 left = *lenp; 1972 1973 if (!conv) 1974 conv = do_proc_dointvec_conv; 1975 1976 for (; left && vleft--; i++, first=0) { 1977 if (write) { 1978 while (left) { 1979 char c; 1980 if (get_user(c, s)) 1981 return -EFAULT; 1982 if (!isspace(c)) 1983 break; 1984 left--; 1985 s++; 1986 } 1987 if (!left) 1988 break; 1989 neg = 0; 1990 len = left; 1991 if (len > sizeof(buf) - 1) 1992 len = sizeof(buf) - 1; 1993 if (copy_from_user(buf, s, len)) 1994 return -EFAULT; 1995 buf[len] = 0; 1996 p = buf; 1997 if (*p == '-' && left > 1) { 1998 neg = 1; 1999 p++; 2000 } 2001 if (*p < '0' || *p > '9') 2002 break; 2003 2004 lval = simple_strtoul(p, &p, 0); 2005 2006 len = p-buf; 2007 if ((len < left) && *p && !isspace(*p)) 2008 break; 2009 if (neg) 2010 val = -val; 2011 s += len; 2012 left -= len; 2013 2014 if (conv(&neg, &lval, i, 1, data)) 2015 break; 2016 } else { 2017 p = buf; 2018 if (!first) 2019 *p++ = '\t'; 2020 2021 if (conv(&neg, &lval, i, 0, data)) 2022 break; 2023 2024 sprintf(p, "%s%lu", neg ? "-" : "", lval); 2025 len = strlen(buf); 2026 if (len > left) 2027 len = left; 2028 if(copy_to_user(s, buf, len)) 2029 return -EFAULT; 2030 left -= len; 2031 s += len; 2032 } 2033 } 2034 2035 if (!write && !first && left) { 2036 if(put_user('\n', s)) 2037 return -EFAULT; 2038 left--, s++; 2039 } 2040 if (write) { 2041 while (left) { 2042 char c; 2043 if (get_user(c, s++)) 2044 return -EFAULT; 2045 if (!isspace(c)) 2046 break; 2047 left--; 2048 } 2049 } 2050 if (write && first) 2051 return -EINVAL; 2052 *lenp -= left; 2053 *ppos += *lenp; 2054 return 0; 2055 #undef TMPBUFLEN 2056 } 2057 2058 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2059 void __user *buffer, size_t *lenp, loff_t *ppos, 2060 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2061 int write, void *data), 2062 void *data) 2063 { 2064 return __do_proc_dointvec(table->data, table, write, filp, 2065 buffer, lenp, ppos, conv, data); 2066 } 2067 2068 /** 2069 * proc_dointvec - read a vector of integers 2070 * @table: the sysctl table 2071 * @write: %TRUE if this is a write to the sysctl file 2072 * @filp: the file structure 2073 * @buffer: the user buffer 2074 * @lenp: the size of the user buffer 2075 * @ppos: file position 2076 * 2077 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2078 * values from/to the user buffer, treated as an ASCII string. 2079 * 2080 * Returns 0 on success. 2081 */ 2082 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2083 void __user *buffer, size_t *lenp, loff_t *ppos) 2084 { 2085 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2086 NULL,NULL); 2087 } 2088 2089 #define OP_SET 0 2090 #define OP_AND 1 2091 #define OP_OR 2 2092 2093 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, 2094 int *valp, 2095 int write, void *data) 2096 { 2097 int op = *(int *)data; 2098 if (write) { 2099 int val = *negp ? -*lvalp : *lvalp; 2100 switch(op) { 2101 case OP_SET: *valp = val; break; 2102 case OP_AND: *valp &= val; break; 2103 case OP_OR: *valp |= val; break; 2104 } 2105 } else { 2106 int val = *valp; 2107 if (val < 0) { 2108 *negp = -1; 2109 *lvalp = (unsigned long)-val; 2110 } else { 2111 *negp = 0; 2112 *lvalp = (unsigned long)val; 2113 } 2114 } 2115 return 0; 2116 } 2117 2118 /* 2119 * Taint values can only be increased 2120 */ 2121 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, 2122 void __user *buffer, size_t *lenp, loff_t *ppos) 2123 { 2124 int op; 2125 2126 if (write && !capable(CAP_SYS_ADMIN)) 2127 return -EPERM; 2128 2129 op = OP_OR; 2130 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2131 do_proc_dointvec_bset_conv,&op); 2132 } 2133 2134 struct do_proc_dointvec_minmax_conv_param { 2135 int *min; 2136 int *max; 2137 }; 2138 2139 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 2140 int *valp, 2141 int write, void *data) 2142 { 2143 struct do_proc_dointvec_minmax_conv_param *param = data; 2144 if (write) { 2145 int val = *negp ? -*lvalp : *lvalp; 2146 if ((param->min && *param->min > val) || 2147 (param->max && *param->max < val)) 2148 return -EINVAL; 2149 *valp = val; 2150 } else { 2151 int val = *valp; 2152 if (val < 0) { 2153 *negp = -1; 2154 *lvalp = (unsigned long)-val; 2155 } else { 2156 *negp = 0; 2157 *lvalp = (unsigned long)val; 2158 } 2159 } 2160 return 0; 2161 } 2162 2163 /** 2164 * proc_dointvec_minmax - read a vector of integers with min/max values 2165 * @table: the sysctl table 2166 * @write: %TRUE if this is a write to the sysctl file 2167 * @filp: the file structure 2168 * @buffer: the user buffer 2169 * @lenp: the size of the user buffer 2170 * @ppos: file position 2171 * 2172 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2173 * values from/to the user buffer, treated as an ASCII string. 2174 * 2175 * This routine will ensure the values are within the range specified by 2176 * table->extra1 (min) and table->extra2 (max). 2177 * 2178 * Returns 0 on success. 2179 */ 2180 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2181 void __user *buffer, size_t *lenp, loff_t *ppos) 2182 { 2183 struct do_proc_dointvec_minmax_conv_param param = { 2184 .min = (int *) table->extra1, 2185 .max = (int *) table->extra2, 2186 }; 2187 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2188 do_proc_dointvec_minmax_conv, ¶m); 2189 } 2190 2191 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2192 struct file *filp, 2193 void __user *buffer, 2194 size_t *lenp, loff_t *ppos, 2195 unsigned long convmul, 2196 unsigned long convdiv) 2197 { 2198 #define TMPBUFLEN 21 2199 unsigned long *i, *min, *max, val; 2200 int vleft, first=1, neg; 2201 size_t len, left; 2202 char buf[TMPBUFLEN], *p; 2203 char __user *s = buffer; 2204 2205 if (!data || !table->maxlen || !*lenp || 2206 (*ppos && !write)) { 2207 *lenp = 0; 2208 return 0; 2209 } 2210 2211 i = (unsigned long *) data; 2212 min = (unsigned long *) table->extra1; 2213 max = (unsigned long *) table->extra2; 2214 vleft = table->maxlen / sizeof(unsigned long); 2215 left = *lenp; 2216 2217 for (; left && vleft--; i++, min++, max++, first=0) { 2218 if (write) { 2219 while (left) { 2220 char c; 2221 if (get_user(c, s)) 2222 return -EFAULT; 2223 if (!isspace(c)) 2224 break; 2225 left--; 2226 s++; 2227 } 2228 if (!left) 2229 break; 2230 neg = 0; 2231 len = left; 2232 if (len > TMPBUFLEN-1) 2233 len = TMPBUFLEN-1; 2234 if (copy_from_user(buf, s, len)) 2235 return -EFAULT; 2236 buf[len] = 0; 2237 p = buf; 2238 if (*p == '-' && left > 1) { 2239 neg = 1; 2240 p++; 2241 } 2242 if (*p < '0' || *p > '9') 2243 break; 2244 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 2245 len = p-buf; 2246 if ((len < left) && *p && !isspace(*p)) 2247 break; 2248 if (neg) 2249 val = -val; 2250 s += len; 2251 left -= len; 2252 2253 if(neg) 2254 continue; 2255 if ((min && val < *min) || (max && val > *max)) 2256 continue; 2257 *i = val; 2258 } else { 2259 p = buf; 2260 if (!first) 2261 *p++ = '\t'; 2262 sprintf(p, "%lu", convdiv * (*i) / convmul); 2263 len = strlen(buf); 2264 if (len > left) 2265 len = left; 2266 if(copy_to_user(s, buf, len)) 2267 return -EFAULT; 2268 left -= len; 2269 s += len; 2270 } 2271 } 2272 2273 if (!write && !first && left) { 2274 if(put_user('\n', s)) 2275 return -EFAULT; 2276 left--, s++; 2277 } 2278 if (write) { 2279 while (left) { 2280 char c; 2281 if (get_user(c, s++)) 2282 return -EFAULT; 2283 if (!isspace(c)) 2284 break; 2285 left--; 2286 } 2287 } 2288 if (write && first) 2289 return -EINVAL; 2290 *lenp -= left; 2291 *ppos += *lenp; 2292 return 0; 2293 #undef TMPBUFLEN 2294 } 2295 2296 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2297 struct file *filp, 2298 void __user *buffer, 2299 size_t *lenp, loff_t *ppos, 2300 unsigned long convmul, 2301 unsigned long convdiv) 2302 { 2303 return __do_proc_doulongvec_minmax(table->data, table, write, 2304 filp, buffer, lenp, ppos, convmul, convdiv); 2305 } 2306 2307 /** 2308 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2309 * @table: the sysctl table 2310 * @write: %TRUE if this is a write to the sysctl file 2311 * @filp: the file structure 2312 * @buffer: the user buffer 2313 * @lenp: the size of the user buffer 2314 * @ppos: file position 2315 * 2316 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2317 * values from/to the user buffer, treated as an ASCII string. 2318 * 2319 * This routine will ensure the values are within the range specified by 2320 * table->extra1 (min) and table->extra2 (max). 2321 * 2322 * Returns 0 on success. 2323 */ 2324 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2325 void __user *buffer, size_t *lenp, loff_t *ppos) 2326 { 2327 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 2328 } 2329 2330 /** 2331 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2332 * @table: the sysctl table 2333 * @write: %TRUE if this is a write to the sysctl file 2334 * @filp: the file structure 2335 * @buffer: the user buffer 2336 * @lenp: the size of the user buffer 2337 * @ppos: file position 2338 * 2339 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2340 * values from/to the user buffer, treated as an ASCII string. The values 2341 * are treated as milliseconds, and converted to jiffies when they are stored. 2342 * 2343 * This routine will ensure the values are within the range specified by 2344 * table->extra1 (min) and table->extra2 (max). 2345 * 2346 * Returns 0 on success. 2347 */ 2348 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2349 struct file *filp, 2350 void __user *buffer, 2351 size_t *lenp, loff_t *ppos) 2352 { 2353 return do_proc_doulongvec_minmax(table, write, filp, buffer, 2354 lenp, ppos, HZ, 1000l); 2355 } 2356 2357 2358 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2359 int *valp, 2360 int write, void *data) 2361 { 2362 if (write) { 2363 if (*lvalp > LONG_MAX / HZ) 2364 return 1; 2365 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2366 } else { 2367 int val = *valp; 2368 unsigned long lval; 2369 if (val < 0) { 2370 *negp = -1; 2371 lval = (unsigned long)-val; 2372 } else { 2373 *negp = 0; 2374 lval = (unsigned long)val; 2375 } 2376 *lvalp = lval / HZ; 2377 } 2378 return 0; 2379 } 2380 2381 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2382 int *valp, 2383 int write, void *data) 2384 { 2385 if (write) { 2386 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2387 return 1; 2388 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2389 } else { 2390 int val = *valp; 2391 unsigned long lval; 2392 if (val < 0) { 2393 *negp = -1; 2394 lval = (unsigned long)-val; 2395 } else { 2396 *negp = 0; 2397 lval = (unsigned long)val; 2398 } 2399 *lvalp = jiffies_to_clock_t(lval); 2400 } 2401 return 0; 2402 } 2403 2404 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2405 int *valp, 2406 int write, void *data) 2407 { 2408 if (write) { 2409 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2410 } else { 2411 int val = *valp; 2412 unsigned long lval; 2413 if (val < 0) { 2414 *negp = -1; 2415 lval = (unsigned long)-val; 2416 } else { 2417 *negp = 0; 2418 lval = (unsigned long)val; 2419 } 2420 *lvalp = jiffies_to_msecs(lval); 2421 } 2422 return 0; 2423 } 2424 2425 /** 2426 * proc_dointvec_jiffies - read a vector of integers as seconds 2427 * @table: the sysctl table 2428 * @write: %TRUE if this is a write to the sysctl file 2429 * @filp: the file structure 2430 * @buffer: the user buffer 2431 * @lenp: the size of the user buffer 2432 * @ppos: file position 2433 * 2434 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2435 * values from/to the user buffer, treated as an ASCII string. 2436 * The values read are assumed to be in seconds, and are converted into 2437 * jiffies. 2438 * 2439 * Returns 0 on success. 2440 */ 2441 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2442 void __user *buffer, size_t *lenp, loff_t *ppos) 2443 { 2444 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2445 do_proc_dointvec_jiffies_conv,NULL); 2446 } 2447 2448 /** 2449 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2450 * @table: the sysctl table 2451 * @write: %TRUE if this is a write to the sysctl file 2452 * @filp: the file structure 2453 * @buffer: the user buffer 2454 * @lenp: the size of the user buffer 2455 * @ppos: pointer to the file position 2456 * 2457 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2458 * values from/to the user buffer, treated as an ASCII string. 2459 * The values read are assumed to be in 1/USER_HZ seconds, and 2460 * are converted into jiffies. 2461 * 2462 * Returns 0 on success. 2463 */ 2464 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2465 void __user *buffer, size_t *lenp, loff_t *ppos) 2466 { 2467 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2468 do_proc_dointvec_userhz_jiffies_conv,NULL); 2469 } 2470 2471 /** 2472 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2473 * @table: the sysctl table 2474 * @write: %TRUE if this is a write to the sysctl file 2475 * @filp: the file structure 2476 * @buffer: the user buffer 2477 * @lenp: the size of the user buffer 2478 * @ppos: file position 2479 * @ppos: the current position in the file 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 * The values read are assumed to be in 1/1000 seconds, and 2484 * are converted into jiffies. 2485 * 2486 * Returns 0 on success. 2487 */ 2488 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2489 void __user *buffer, size_t *lenp, loff_t *ppos) 2490 { 2491 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2492 do_proc_dointvec_ms_jiffies_conv, NULL); 2493 } 2494 2495 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 2496 void __user *buffer, size_t *lenp, loff_t *ppos) 2497 { 2498 struct pid *new_pid; 2499 pid_t tmp; 2500 int r; 2501 2502 tmp = pid_vnr(cad_pid); 2503 2504 r = __do_proc_dointvec(&tmp, table, write, filp, buffer, 2505 lenp, ppos, NULL, NULL); 2506 if (r || !write) 2507 return r; 2508 2509 new_pid = find_get_pid(tmp); 2510 if (!new_pid) 2511 return -ESRCH; 2512 2513 put_pid(xchg(&cad_pid, new_pid)); 2514 return 0; 2515 } 2516 2517 #else /* CONFIG_PROC_FS */ 2518 2519 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2520 void __user *buffer, size_t *lenp, loff_t *ppos) 2521 { 2522 return -ENOSYS; 2523 } 2524 2525 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2526 void __user *buffer, size_t *lenp, loff_t *ppos) 2527 { 2528 return -ENOSYS; 2529 } 2530 2531 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2532 void __user *buffer, size_t *lenp, loff_t *ppos) 2533 { 2534 return -ENOSYS; 2535 } 2536 2537 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2538 void __user *buffer, size_t *lenp, loff_t *ppos) 2539 { 2540 return -ENOSYS; 2541 } 2542 2543 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2544 void __user *buffer, size_t *lenp, loff_t *ppos) 2545 { 2546 return -ENOSYS; 2547 } 2548 2549 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2550 void __user *buffer, size_t *lenp, loff_t *ppos) 2551 { 2552 return -ENOSYS; 2553 } 2554 2555 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2556 void __user *buffer, size_t *lenp, loff_t *ppos) 2557 { 2558 return -ENOSYS; 2559 } 2560 2561 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2562 struct file *filp, 2563 void __user *buffer, 2564 size_t *lenp, loff_t *ppos) 2565 { 2566 return -ENOSYS; 2567 } 2568 2569 2570 #endif /* CONFIG_PROC_FS */ 2571 2572 2573 #ifdef CONFIG_SYSCTL_SYSCALL 2574 /* 2575 * General sysctl support routines 2576 */ 2577 2578 /* The generic sysctl data routine (used if no strategy routine supplied) */ 2579 int sysctl_data(struct ctl_table *table, int __user *name, int nlen, 2580 void __user *oldval, size_t __user *oldlenp, 2581 void __user *newval, size_t newlen) 2582 { 2583 size_t len; 2584 2585 /* Get out of I don't have a variable */ 2586 if (!table->data || !table->maxlen) 2587 return -ENOTDIR; 2588 2589 if (oldval && oldlenp) { 2590 if (get_user(len, oldlenp)) 2591 return -EFAULT; 2592 if (len) { 2593 if (len > table->maxlen) 2594 len = table->maxlen; 2595 if (copy_to_user(oldval, table->data, len)) 2596 return -EFAULT; 2597 if (put_user(len, oldlenp)) 2598 return -EFAULT; 2599 } 2600 } 2601 2602 if (newval && newlen) { 2603 if (newlen > table->maxlen) 2604 newlen = table->maxlen; 2605 2606 if (copy_from_user(table->data, newval, newlen)) 2607 return -EFAULT; 2608 } 2609 return 1; 2610 } 2611 2612 /* The generic string strategy routine: */ 2613 int sysctl_string(struct ctl_table *table, int __user *name, int nlen, 2614 void __user *oldval, size_t __user *oldlenp, 2615 void __user *newval, size_t newlen) 2616 { 2617 if (!table->data || !table->maxlen) 2618 return -ENOTDIR; 2619 2620 if (oldval && oldlenp) { 2621 size_t bufsize; 2622 if (get_user(bufsize, oldlenp)) 2623 return -EFAULT; 2624 if (bufsize) { 2625 size_t len = strlen(table->data), copied; 2626 2627 /* This shouldn't trigger for a well-formed sysctl */ 2628 if (len > table->maxlen) 2629 len = table->maxlen; 2630 2631 /* Copy up to a max of bufsize-1 bytes of the string */ 2632 copied = (len >= bufsize) ? bufsize - 1 : len; 2633 2634 if (copy_to_user(oldval, table->data, copied) || 2635 put_user(0, (char __user *)(oldval + copied))) 2636 return -EFAULT; 2637 if (put_user(len, oldlenp)) 2638 return -EFAULT; 2639 } 2640 } 2641 if (newval && newlen) { 2642 size_t len = newlen; 2643 if (len > table->maxlen) 2644 len = table->maxlen; 2645 if(copy_from_user(table->data, newval, len)) 2646 return -EFAULT; 2647 if (len == table->maxlen) 2648 len--; 2649 ((char *) table->data)[len] = 0; 2650 } 2651 return 1; 2652 } 2653 2654 /* 2655 * This function makes sure that all of the integers in the vector 2656 * are between the minimum and maximum values given in the arrays 2657 * table->extra1 and table->extra2, respectively. 2658 */ 2659 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, 2660 void __user *oldval, size_t __user *oldlenp, 2661 void __user *newval, size_t newlen) 2662 { 2663 2664 if (newval && newlen) { 2665 int __user *vec = (int __user *) newval; 2666 int *min = (int *) table->extra1; 2667 int *max = (int *) table->extra2; 2668 size_t length; 2669 int i; 2670 2671 if (newlen % sizeof(int) != 0) 2672 return -EINVAL; 2673 2674 if (!table->extra1 && !table->extra2) 2675 return 0; 2676 2677 if (newlen > table->maxlen) 2678 newlen = table->maxlen; 2679 length = newlen / sizeof(int); 2680 2681 for (i = 0; i < length; i++) { 2682 int value; 2683 if (get_user(value, vec + i)) 2684 return -EFAULT; 2685 if (min && value < min[i]) 2686 return -EINVAL; 2687 if (max && value > max[i]) 2688 return -EINVAL; 2689 } 2690 } 2691 return 0; 2692 } 2693 2694 /* Strategy function to convert jiffies to seconds */ 2695 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, 2696 void __user *oldval, size_t __user *oldlenp, 2697 void __user *newval, size_t newlen) 2698 { 2699 if (oldval && oldlenp) { 2700 size_t olen; 2701 2702 if (get_user(olen, oldlenp)) 2703 return -EFAULT; 2704 if (olen) { 2705 int val; 2706 2707 if (olen < sizeof(int)) 2708 return -EINVAL; 2709 2710 val = *(int *)(table->data) / HZ; 2711 if (put_user(val, (int __user *)oldval)) 2712 return -EFAULT; 2713 if (put_user(sizeof(int), oldlenp)) 2714 return -EFAULT; 2715 } 2716 } 2717 if (newval && newlen) { 2718 int new; 2719 if (newlen != sizeof(int)) 2720 return -EINVAL; 2721 if (get_user(new, (int __user *)newval)) 2722 return -EFAULT; 2723 *(int *)(table->data) = new*HZ; 2724 } 2725 return 1; 2726 } 2727 2728 /* Strategy function to convert jiffies to seconds */ 2729 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, 2730 void __user *oldval, size_t __user *oldlenp, 2731 void __user *newval, size_t newlen) 2732 { 2733 if (oldval && oldlenp) { 2734 size_t olen; 2735 2736 if (get_user(olen, oldlenp)) 2737 return -EFAULT; 2738 if (olen) { 2739 int val; 2740 2741 if (olen < sizeof(int)) 2742 return -EINVAL; 2743 2744 val = jiffies_to_msecs(*(int *)(table->data)); 2745 if (put_user(val, (int __user *)oldval)) 2746 return -EFAULT; 2747 if (put_user(sizeof(int), oldlenp)) 2748 return -EFAULT; 2749 } 2750 } 2751 if (newval && newlen) { 2752 int new; 2753 if (newlen != sizeof(int)) 2754 return -EINVAL; 2755 if (get_user(new, (int __user *)newval)) 2756 return -EFAULT; 2757 *(int *)(table->data) = msecs_to_jiffies(new); 2758 } 2759 return 1; 2760 } 2761 2762 2763 2764 #else /* CONFIG_SYSCTL_SYSCALL */ 2765 2766 2767 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 2768 { 2769 struct __sysctl_args tmp; 2770 int error; 2771 2772 if (copy_from_user(&tmp, args, sizeof(tmp))) 2773 return -EFAULT; 2774 2775 error = deprecated_sysctl_warning(&tmp); 2776 2777 /* If no error reading the parameters then just -ENOSYS ... */ 2778 if (!error) 2779 error = -ENOSYS; 2780 2781 return error; 2782 } 2783 2784 int sysctl_data(struct ctl_table *table, int __user *name, int nlen, 2785 void __user *oldval, size_t __user *oldlenp, 2786 void __user *newval, size_t newlen) 2787 { 2788 return -ENOSYS; 2789 } 2790 2791 int sysctl_string(struct ctl_table *table, int __user *name, int nlen, 2792 void __user *oldval, size_t __user *oldlenp, 2793 void __user *newval, size_t newlen) 2794 { 2795 return -ENOSYS; 2796 } 2797 2798 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, 2799 void __user *oldval, size_t __user *oldlenp, 2800 void __user *newval, size_t newlen) 2801 { 2802 return -ENOSYS; 2803 } 2804 2805 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, 2806 void __user *oldval, size_t __user *oldlenp, 2807 void __user *newval, size_t newlen) 2808 { 2809 return -ENOSYS; 2810 } 2811 2812 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, 2813 void __user *oldval, size_t __user *oldlenp, 2814 void __user *newval, size_t newlen) 2815 { 2816 return -ENOSYS; 2817 } 2818 2819 #endif /* CONFIG_SYSCTL_SYSCALL */ 2820 2821 static int deprecated_sysctl_warning(struct __sysctl_args *args) 2822 { 2823 static int msg_count; 2824 int name[CTL_MAXNAME]; 2825 int i; 2826 2827 /* Check args->nlen. */ 2828 if (args->nlen < 0 || args->nlen > CTL_MAXNAME) 2829 return -ENOTDIR; 2830 2831 /* Read in the sysctl name for better debug message logging */ 2832 for (i = 0; i < args->nlen; i++) 2833 if (get_user(name[i], args->name + i)) 2834 return -EFAULT; 2835 2836 /* Ignore accesses to kernel.version */ 2837 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) 2838 return 0; 2839 2840 if (msg_count < 5) { 2841 msg_count++; 2842 printk(KERN_INFO 2843 "warning: process `%s' used the deprecated sysctl " 2844 "system call with ", current->comm); 2845 for (i = 0; i < args->nlen; i++) 2846 printk("%d.", name[i]); 2847 printk("\n"); 2848 } 2849 return 0; 2850 } 2851 2852 /* 2853 * No sense putting this after each symbol definition, twice, 2854 * exception granted :-) 2855 */ 2856 EXPORT_SYMBOL(proc_dointvec); 2857 EXPORT_SYMBOL(proc_dointvec_jiffies); 2858 EXPORT_SYMBOL(proc_dointvec_minmax); 2859 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2860 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2861 EXPORT_SYMBOL(proc_dostring); 2862 EXPORT_SYMBOL(proc_doulongvec_minmax); 2863 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2864 EXPORT_SYMBOL(register_sysctl_table); 2865 EXPORT_SYMBOL(register_sysctl_paths); 2866 EXPORT_SYMBOL(sysctl_intvec); 2867 EXPORT_SYMBOL(sysctl_jiffies); 2868 EXPORT_SYMBOL(sysctl_ms_jiffies); 2869 EXPORT_SYMBOL(sysctl_string); 2870 EXPORT_SYMBOL(sysctl_data); 2871 EXPORT_SYMBOL(unregister_sysctl_table); 2872