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 50 #include <asm/uaccess.h> 51 #include <asm/processor.h> 52 53 #ifdef CONFIG_X86 54 #include <asm/nmi.h> 55 #include <asm/stacktrace.h> 56 #include <asm/io.h> 57 #endif 58 59 static int deprecated_sysctl_warning(struct __sysctl_args *args); 60 61 #if defined(CONFIG_SYSCTL) 62 63 /* External variables not in a header file. */ 64 extern int C_A_D; 65 extern int print_fatal_signals; 66 extern int sysctl_overcommit_memory; 67 extern int sysctl_overcommit_ratio; 68 extern int sysctl_panic_on_oom; 69 extern int sysctl_oom_kill_allocating_task; 70 extern int sysctl_oom_dump_tasks; 71 extern int max_threads; 72 extern int core_uses_pid; 73 extern int suid_dumpable; 74 extern char core_pattern[]; 75 extern int pid_max; 76 extern int min_free_kbytes; 77 extern int pid_max_min, pid_max_max; 78 extern int sysctl_drop_caches; 79 extern int percpu_pagelist_fraction; 80 extern int compat_log; 81 extern int maps_protect; 82 extern int sysctl_stat_interval; 83 extern int latencytop_enabled; 84 extern int sysctl_nr_open_min, sysctl_nr_open_max; 85 86 /* Constants used for minimum and maximum */ 87 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM) 88 static int one = 1; 89 #endif 90 91 #ifdef CONFIG_DETECT_SOFTLOCKUP 92 static int sixty = 60; 93 #endif 94 95 #ifdef CONFIG_MMU 96 static int two = 2; 97 #endif 98 99 static int zero; 100 static int one_hundred = 100; 101 102 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 103 static int maxolduid = 65535; 104 static int minolduid; 105 static int min_percpu_pagelist_fract = 8; 106 107 static int ngroups_max = NGROUPS_MAX; 108 109 #ifdef CONFIG_KMOD 110 extern char modprobe_path[]; 111 #endif 112 #ifdef CONFIG_CHR_DEV_SG 113 extern int sg_big_buff; 114 #endif 115 116 #ifdef __sparc__ 117 extern char reboot_command []; 118 extern int stop_a_enabled; 119 extern int scons_pwroff; 120 #endif 121 122 #ifdef __hppa__ 123 extern int pwrsw_enabled; 124 extern int unaligned_enabled; 125 #endif 126 127 #ifdef CONFIG_S390 128 #ifdef CONFIG_MATHEMU 129 extern int sysctl_ieee_emulation_warnings; 130 #endif 131 extern int sysctl_userprocess_debug; 132 extern int spin_retry; 133 #endif 134 135 extern int sysctl_hz_timer; 136 137 #ifdef CONFIG_BSD_PROCESS_ACCT 138 extern int acct_parm[]; 139 #endif 140 141 #ifdef CONFIG_IA64 142 extern int no_unaligned_warning; 143 #endif 144 145 #ifdef CONFIG_RT_MUTEXES 146 extern int max_lock_depth; 147 #endif 148 149 #ifdef CONFIG_PROC_SYSCTL 150 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 151 void __user *buffer, size_t *lenp, loff_t *ppos); 152 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, 153 void __user *buffer, size_t *lenp, loff_t *ppos); 154 #endif 155 156 static struct ctl_table root_table[]; 157 static struct ctl_table_root sysctl_table_root; 158 static struct ctl_table_header root_table_header = { 159 .ctl_table = root_table, 160 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list), 161 .root = &sysctl_table_root, 162 }; 163 static struct ctl_table_root sysctl_table_root = { 164 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 165 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry), 166 }; 167 168 static struct ctl_table kern_table[]; 169 static struct ctl_table vm_table[]; 170 static struct ctl_table fs_table[]; 171 static struct ctl_table debug_table[]; 172 static struct ctl_table dev_table[]; 173 extern struct ctl_table random_table[]; 174 #ifdef CONFIG_INOTIFY_USER 175 extern struct ctl_table inotify_table[]; 176 #endif 177 178 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 179 int sysctl_legacy_va_layout; 180 #endif 181 182 extern int prove_locking; 183 extern int lock_stat; 184 185 /* The default sysctl tables: */ 186 187 static struct ctl_table root_table[] = { 188 { 189 .ctl_name = CTL_KERN, 190 .procname = "kernel", 191 .mode = 0555, 192 .child = kern_table, 193 }, 194 { 195 .ctl_name = CTL_VM, 196 .procname = "vm", 197 .mode = 0555, 198 .child = vm_table, 199 }, 200 { 201 .ctl_name = CTL_FS, 202 .procname = "fs", 203 .mode = 0555, 204 .child = fs_table, 205 }, 206 { 207 .ctl_name = CTL_DEBUG, 208 .procname = "debug", 209 .mode = 0555, 210 .child = debug_table, 211 }, 212 { 213 .ctl_name = CTL_DEV, 214 .procname = "dev", 215 .mode = 0555, 216 .child = dev_table, 217 }, 218 /* 219 * NOTE: do not add new entries to this table unless you have read 220 * Documentation/sysctl/ctl_unnumbered.txt 221 */ 222 { .ctl_name = 0 } 223 }; 224 225 #ifdef CONFIG_SCHED_DEBUG 226 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 227 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 228 static int min_wakeup_granularity_ns; /* 0 usecs */ 229 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 230 #endif 231 232 static struct ctl_table kern_table[] = { 233 #ifdef CONFIG_SCHED_DEBUG 234 { 235 .ctl_name = CTL_UNNUMBERED, 236 .procname = "sched_min_granularity_ns", 237 .data = &sysctl_sched_min_granularity, 238 .maxlen = sizeof(unsigned int), 239 .mode = 0644, 240 .proc_handler = &sched_nr_latency_handler, 241 .strategy = &sysctl_intvec, 242 .extra1 = &min_sched_granularity_ns, 243 .extra2 = &max_sched_granularity_ns, 244 }, 245 { 246 .ctl_name = CTL_UNNUMBERED, 247 .procname = "sched_latency_ns", 248 .data = &sysctl_sched_latency, 249 .maxlen = sizeof(unsigned int), 250 .mode = 0644, 251 .proc_handler = &sched_nr_latency_handler, 252 .strategy = &sysctl_intvec, 253 .extra1 = &min_sched_granularity_ns, 254 .extra2 = &max_sched_granularity_ns, 255 }, 256 { 257 .ctl_name = CTL_UNNUMBERED, 258 .procname = "sched_wakeup_granularity_ns", 259 .data = &sysctl_sched_wakeup_granularity, 260 .maxlen = sizeof(unsigned int), 261 .mode = 0644, 262 .proc_handler = &proc_dointvec_minmax, 263 .strategy = &sysctl_intvec, 264 .extra1 = &min_wakeup_granularity_ns, 265 .extra2 = &max_wakeup_granularity_ns, 266 }, 267 { 268 .ctl_name = CTL_UNNUMBERED, 269 .procname = "sched_child_runs_first", 270 .data = &sysctl_sched_child_runs_first, 271 .maxlen = sizeof(unsigned int), 272 .mode = 0644, 273 .proc_handler = &proc_dointvec, 274 }, 275 { 276 .ctl_name = CTL_UNNUMBERED, 277 .procname = "sched_features", 278 .data = &sysctl_sched_features, 279 .maxlen = sizeof(unsigned int), 280 .mode = 0644, 281 .proc_handler = &proc_dointvec, 282 }, 283 { 284 .ctl_name = CTL_UNNUMBERED, 285 .procname = "sched_migration_cost", 286 .data = &sysctl_sched_migration_cost, 287 .maxlen = sizeof(unsigned int), 288 .mode = 0644, 289 .proc_handler = &proc_dointvec, 290 }, 291 { 292 .ctl_name = CTL_UNNUMBERED, 293 .procname = "sched_nr_migrate", 294 .data = &sysctl_sched_nr_migrate, 295 .maxlen = sizeof(unsigned int), 296 .mode = 0644, 297 .proc_handler = &proc_dointvec, 298 }, 299 #endif 300 { 301 .ctl_name = CTL_UNNUMBERED, 302 .procname = "sched_rt_period_us", 303 .data = &sysctl_sched_rt_period, 304 .maxlen = sizeof(unsigned int), 305 .mode = 0644, 306 .proc_handler = &sched_rt_handler, 307 }, 308 { 309 .ctl_name = CTL_UNNUMBERED, 310 .procname = "sched_rt_runtime_us", 311 .data = &sysctl_sched_rt_runtime, 312 .maxlen = sizeof(int), 313 .mode = 0644, 314 .proc_handler = &sched_rt_handler, 315 }, 316 { 317 .ctl_name = CTL_UNNUMBERED, 318 .procname = "sched_compat_yield", 319 .data = &sysctl_sched_compat_yield, 320 .maxlen = sizeof(unsigned int), 321 .mode = 0644, 322 .proc_handler = &proc_dointvec, 323 }, 324 #ifdef CONFIG_PROVE_LOCKING 325 { 326 .ctl_name = CTL_UNNUMBERED, 327 .procname = "prove_locking", 328 .data = &prove_locking, 329 .maxlen = sizeof(int), 330 .mode = 0644, 331 .proc_handler = &proc_dointvec, 332 }, 333 #endif 334 #ifdef CONFIG_LOCK_STAT 335 { 336 .ctl_name = CTL_UNNUMBERED, 337 .procname = "lock_stat", 338 .data = &lock_stat, 339 .maxlen = sizeof(int), 340 .mode = 0644, 341 .proc_handler = &proc_dointvec, 342 }, 343 #endif 344 { 345 .ctl_name = KERN_PANIC, 346 .procname = "panic", 347 .data = &panic_timeout, 348 .maxlen = sizeof(int), 349 .mode = 0644, 350 .proc_handler = &proc_dointvec, 351 }, 352 { 353 .ctl_name = KERN_CORE_USES_PID, 354 .procname = "core_uses_pid", 355 .data = &core_uses_pid, 356 .maxlen = sizeof(int), 357 .mode = 0644, 358 .proc_handler = &proc_dointvec, 359 }, 360 { 361 .ctl_name = KERN_CORE_PATTERN, 362 .procname = "core_pattern", 363 .data = core_pattern, 364 .maxlen = CORENAME_MAX_SIZE, 365 .mode = 0644, 366 .proc_handler = &proc_dostring, 367 .strategy = &sysctl_string, 368 }, 369 #ifdef CONFIG_PROC_SYSCTL 370 { 371 .procname = "tainted", 372 .data = &tainted, 373 .maxlen = sizeof(int), 374 .mode = 0644, 375 .proc_handler = &proc_dointvec_taint, 376 }, 377 #endif 378 #ifdef CONFIG_LATENCYTOP 379 { 380 .procname = "latencytop", 381 .data = &latencytop_enabled, 382 .maxlen = sizeof(int), 383 .mode = 0644, 384 .proc_handler = &proc_dointvec, 385 }, 386 #endif 387 #ifdef CONFIG_BLK_DEV_INITRD 388 { 389 .ctl_name = KERN_REALROOTDEV, 390 .procname = "real-root-dev", 391 .data = &real_root_dev, 392 .maxlen = sizeof(int), 393 .mode = 0644, 394 .proc_handler = &proc_dointvec, 395 }, 396 #endif 397 { 398 .ctl_name = CTL_UNNUMBERED, 399 .procname = "print-fatal-signals", 400 .data = &print_fatal_signals, 401 .maxlen = sizeof(int), 402 .mode = 0644, 403 .proc_handler = &proc_dointvec, 404 }, 405 #ifdef __sparc__ 406 { 407 .ctl_name = KERN_SPARC_REBOOT, 408 .procname = "reboot-cmd", 409 .data = reboot_command, 410 .maxlen = 256, 411 .mode = 0644, 412 .proc_handler = &proc_dostring, 413 .strategy = &sysctl_string, 414 }, 415 { 416 .ctl_name = KERN_SPARC_STOP_A, 417 .procname = "stop-a", 418 .data = &stop_a_enabled, 419 .maxlen = sizeof (int), 420 .mode = 0644, 421 .proc_handler = &proc_dointvec, 422 }, 423 { 424 .ctl_name = KERN_SPARC_SCONS_PWROFF, 425 .procname = "scons-poweroff", 426 .data = &scons_pwroff, 427 .maxlen = sizeof (int), 428 .mode = 0644, 429 .proc_handler = &proc_dointvec, 430 }, 431 #endif 432 #ifdef __hppa__ 433 { 434 .ctl_name = KERN_HPPA_PWRSW, 435 .procname = "soft-power", 436 .data = &pwrsw_enabled, 437 .maxlen = sizeof (int), 438 .mode = 0644, 439 .proc_handler = &proc_dointvec, 440 }, 441 { 442 .ctl_name = KERN_HPPA_UNALIGNED, 443 .procname = "unaligned-trap", 444 .data = &unaligned_enabled, 445 .maxlen = sizeof (int), 446 .mode = 0644, 447 .proc_handler = &proc_dointvec, 448 }, 449 #endif 450 { 451 .ctl_name = KERN_CTLALTDEL, 452 .procname = "ctrl-alt-del", 453 .data = &C_A_D, 454 .maxlen = sizeof(int), 455 .mode = 0644, 456 .proc_handler = &proc_dointvec, 457 }, 458 #ifdef CONFIG_KMOD 459 { 460 .ctl_name = KERN_MODPROBE, 461 .procname = "modprobe", 462 .data = &modprobe_path, 463 .maxlen = KMOD_PATH_LEN, 464 .mode = 0644, 465 .proc_handler = &proc_dostring, 466 .strategy = &sysctl_string, 467 }, 468 #endif 469 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) 470 { 471 .ctl_name = KERN_HOTPLUG, 472 .procname = "hotplug", 473 .data = &uevent_helper, 474 .maxlen = UEVENT_HELPER_PATH_LEN, 475 .mode = 0644, 476 .proc_handler = &proc_dostring, 477 .strategy = &sysctl_string, 478 }, 479 #endif 480 #ifdef CONFIG_CHR_DEV_SG 481 { 482 .ctl_name = KERN_SG_BIG_BUFF, 483 .procname = "sg-big-buff", 484 .data = &sg_big_buff, 485 .maxlen = sizeof (int), 486 .mode = 0444, 487 .proc_handler = &proc_dointvec, 488 }, 489 #endif 490 #ifdef CONFIG_BSD_PROCESS_ACCT 491 { 492 .ctl_name = KERN_ACCT, 493 .procname = "acct", 494 .data = &acct_parm, 495 .maxlen = 3*sizeof(int), 496 .mode = 0644, 497 .proc_handler = &proc_dointvec, 498 }, 499 #endif 500 #ifdef CONFIG_MAGIC_SYSRQ 501 { 502 .ctl_name = KERN_SYSRQ, 503 .procname = "sysrq", 504 .data = &__sysrq_enabled, 505 .maxlen = sizeof (int), 506 .mode = 0644, 507 .proc_handler = &proc_dointvec, 508 }, 509 #endif 510 #ifdef CONFIG_PROC_SYSCTL 511 { 512 .procname = "cad_pid", 513 .data = NULL, 514 .maxlen = sizeof (int), 515 .mode = 0600, 516 .proc_handler = &proc_do_cad_pid, 517 }, 518 #endif 519 { 520 .ctl_name = KERN_MAX_THREADS, 521 .procname = "threads-max", 522 .data = &max_threads, 523 .maxlen = sizeof(int), 524 .mode = 0644, 525 .proc_handler = &proc_dointvec, 526 }, 527 { 528 .ctl_name = KERN_RANDOM, 529 .procname = "random", 530 .mode = 0555, 531 .child = random_table, 532 }, 533 { 534 .ctl_name = KERN_OVERFLOWUID, 535 .procname = "overflowuid", 536 .data = &overflowuid, 537 .maxlen = sizeof(int), 538 .mode = 0644, 539 .proc_handler = &proc_dointvec_minmax, 540 .strategy = &sysctl_intvec, 541 .extra1 = &minolduid, 542 .extra2 = &maxolduid, 543 }, 544 { 545 .ctl_name = KERN_OVERFLOWGID, 546 .procname = "overflowgid", 547 .data = &overflowgid, 548 .maxlen = sizeof(int), 549 .mode = 0644, 550 .proc_handler = &proc_dointvec_minmax, 551 .strategy = &sysctl_intvec, 552 .extra1 = &minolduid, 553 .extra2 = &maxolduid, 554 }, 555 #ifdef CONFIG_S390 556 #ifdef CONFIG_MATHEMU 557 { 558 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 559 .procname = "ieee_emulation_warnings", 560 .data = &sysctl_ieee_emulation_warnings, 561 .maxlen = sizeof(int), 562 .mode = 0644, 563 .proc_handler = &proc_dointvec, 564 }, 565 #endif 566 #ifdef CONFIG_NO_IDLE_HZ 567 { 568 .ctl_name = KERN_HZ_TIMER, 569 .procname = "hz_timer", 570 .data = &sysctl_hz_timer, 571 .maxlen = sizeof(int), 572 .mode = 0644, 573 .proc_handler = &proc_dointvec, 574 }, 575 #endif 576 { 577 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 578 .procname = "userprocess_debug", 579 .data = &sysctl_userprocess_debug, 580 .maxlen = sizeof(int), 581 .mode = 0644, 582 .proc_handler = &proc_dointvec, 583 }, 584 #endif 585 { 586 .ctl_name = KERN_PIDMAX, 587 .procname = "pid_max", 588 .data = &pid_max, 589 .maxlen = sizeof (int), 590 .mode = 0644, 591 .proc_handler = &proc_dointvec_minmax, 592 .strategy = sysctl_intvec, 593 .extra1 = &pid_max_min, 594 .extra2 = &pid_max_max, 595 }, 596 { 597 .ctl_name = KERN_PANIC_ON_OOPS, 598 .procname = "panic_on_oops", 599 .data = &panic_on_oops, 600 .maxlen = sizeof(int), 601 .mode = 0644, 602 .proc_handler = &proc_dointvec, 603 }, 604 #if defined CONFIG_PRINTK 605 { 606 .ctl_name = KERN_PRINTK, 607 .procname = "printk", 608 .data = &console_loglevel, 609 .maxlen = 4*sizeof(int), 610 .mode = 0644, 611 .proc_handler = &proc_dointvec, 612 }, 613 { 614 .ctl_name = KERN_PRINTK_RATELIMIT, 615 .procname = "printk_ratelimit", 616 .data = &printk_ratelimit_jiffies, 617 .maxlen = sizeof(int), 618 .mode = 0644, 619 .proc_handler = &proc_dointvec_jiffies, 620 .strategy = &sysctl_jiffies, 621 }, 622 { 623 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 624 .procname = "printk_ratelimit_burst", 625 .data = &printk_ratelimit_burst, 626 .maxlen = sizeof(int), 627 .mode = 0644, 628 .proc_handler = &proc_dointvec, 629 }, 630 #endif 631 { 632 .ctl_name = KERN_NGROUPS_MAX, 633 .procname = "ngroups_max", 634 .data = &ngroups_max, 635 .maxlen = sizeof (int), 636 .mode = 0444, 637 .proc_handler = &proc_dointvec, 638 }, 639 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 640 { 641 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 642 .procname = "unknown_nmi_panic", 643 .data = &unknown_nmi_panic, 644 .maxlen = sizeof (int), 645 .mode = 0644, 646 .proc_handler = &proc_dointvec, 647 }, 648 { 649 .procname = "nmi_watchdog", 650 .data = &nmi_watchdog_enabled, 651 .maxlen = sizeof (int), 652 .mode = 0644, 653 .proc_handler = &proc_nmi_enabled, 654 }, 655 #endif 656 #if defined(CONFIG_X86) 657 { 658 .ctl_name = KERN_PANIC_ON_NMI, 659 .procname = "panic_on_unrecovered_nmi", 660 .data = &panic_on_unrecovered_nmi, 661 .maxlen = sizeof(int), 662 .mode = 0644, 663 .proc_handler = &proc_dointvec, 664 }, 665 { 666 .ctl_name = KERN_BOOTLOADER_TYPE, 667 .procname = "bootloader_type", 668 .data = &bootloader_type, 669 .maxlen = sizeof (int), 670 .mode = 0444, 671 .proc_handler = &proc_dointvec, 672 }, 673 { 674 .ctl_name = CTL_UNNUMBERED, 675 .procname = "kstack_depth_to_print", 676 .data = &kstack_depth_to_print, 677 .maxlen = sizeof(int), 678 .mode = 0644, 679 .proc_handler = &proc_dointvec, 680 }, 681 { 682 .ctl_name = CTL_UNNUMBERED, 683 .procname = "io_delay_type", 684 .data = &io_delay_type, 685 .maxlen = sizeof(int), 686 .mode = 0644, 687 .proc_handler = &proc_dointvec, 688 }, 689 #endif 690 #if defined(CONFIG_MMU) 691 { 692 .ctl_name = KERN_RANDOMIZE, 693 .procname = "randomize_va_space", 694 .data = &randomize_va_space, 695 .maxlen = sizeof(int), 696 .mode = 0644, 697 .proc_handler = &proc_dointvec, 698 }, 699 #endif 700 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 701 { 702 .ctl_name = KERN_SPIN_RETRY, 703 .procname = "spin_retry", 704 .data = &spin_retry, 705 .maxlen = sizeof (int), 706 .mode = 0644, 707 .proc_handler = &proc_dointvec, 708 }, 709 #endif 710 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 711 { 712 .procname = "acpi_video_flags", 713 .data = &acpi_realmode_flags, 714 .maxlen = sizeof (unsigned long), 715 .mode = 0644, 716 .proc_handler = &proc_doulongvec_minmax, 717 }, 718 #endif 719 #ifdef CONFIG_IA64 720 { 721 .ctl_name = KERN_IA64_UNALIGNED, 722 .procname = "ignore-unaligned-usertrap", 723 .data = &no_unaligned_warning, 724 .maxlen = sizeof (int), 725 .mode = 0644, 726 .proc_handler = &proc_dointvec, 727 }, 728 #endif 729 #ifdef CONFIG_DETECT_SOFTLOCKUP 730 { 731 .ctl_name = CTL_UNNUMBERED, 732 .procname = "softlockup_panic", 733 .data = &softlockup_panic, 734 .maxlen = sizeof(int), 735 .mode = 0644, 736 .proc_handler = &proc_doulongvec_minmax, 737 .strategy = &sysctl_intvec, 738 .extra1 = &zero, 739 .extra2 = &one, 740 }, 741 { 742 .ctl_name = CTL_UNNUMBERED, 743 .procname = "softlockup_thresh", 744 .data = &softlockup_thresh, 745 .maxlen = sizeof(unsigned long), 746 .mode = 0644, 747 .proc_handler = &proc_doulongvec_minmax, 748 .strategy = &sysctl_intvec, 749 .extra1 = &one, 750 .extra2 = &sixty, 751 }, 752 { 753 .ctl_name = CTL_UNNUMBERED, 754 .procname = "hung_task_check_count", 755 .data = &sysctl_hung_task_check_count, 756 .maxlen = sizeof(unsigned long), 757 .mode = 0644, 758 .proc_handler = &proc_doulongvec_minmax, 759 .strategy = &sysctl_intvec, 760 }, 761 { 762 .ctl_name = CTL_UNNUMBERED, 763 .procname = "hung_task_timeout_secs", 764 .data = &sysctl_hung_task_timeout_secs, 765 .maxlen = sizeof(unsigned long), 766 .mode = 0644, 767 .proc_handler = &proc_doulongvec_minmax, 768 .strategy = &sysctl_intvec, 769 }, 770 { 771 .ctl_name = CTL_UNNUMBERED, 772 .procname = "hung_task_warnings", 773 .data = &sysctl_hung_task_warnings, 774 .maxlen = sizeof(unsigned long), 775 .mode = 0644, 776 .proc_handler = &proc_doulongvec_minmax, 777 .strategy = &sysctl_intvec, 778 }, 779 #endif 780 #ifdef CONFIG_COMPAT 781 { 782 .ctl_name = KERN_COMPAT_LOG, 783 .procname = "compat-log", 784 .data = &compat_log, 785 .maxlen = sizeof (int), 786 .mode = 0644, 787 .proc_handler = &proc_dointvec, 788 }, 789 #endif 790 #ifdef CONFIG_RT_MUTEXES 791 { 792 .ctl_name = KERN_MAX_LOCK_DEPTH, 793 .procname = "max_lock_depth", 794 .data = &max_lock_depth, 795 .maxlen = sizeof(int), 796 .mode = 0644, 797 .proc_handler = &proc_dointvec, 798 }, 799 #endif 800 #ifdef CONFIG_PROC_FS 801 { 802 .ctl_name = CTL_UNNUMBERED, 803 .procname = "maps_protect", 804 .data = &maps_protect, 805 .maxlen = sizeof(int), 806 .mode = 0644, 807 .proc_handler = &proc_dointvec, 808 }, 809 #endif 810 { 811 .ctl_name = CTL_UNNUMBERED, 812 .procname = "poweroff_cmd", 813 .data = &poweroff_cmd, 814 .maxlen = POWEROFF_CMD_PATH_LEN, 815 .mode = 0644, 816 .proc_handler = &proc_dostring, 817 .strategy = &sysctl_string, 818 }, 819 #ifdef CONFIG_KEYS 820 { 821 .ctl_name = CTL_UNNUMBERED, 822 .procname = "keys", 823 .mode = 0555, 824 .child = key_sysctls, 825 }, 826 #endif 827 /* 828 * NOTE: do not add new entries to this table unless you have read 829 * Documentation/sysctl/ctl_unnumbered.txt 830 */ 831 { .ctl_name = 0 } 832 }; 833 834 static struct ctl_table vm_table[] = { 835 { 836 .ctl_name = VM_OVERCOMMIT_MEMORY, 837 .procname = "overcommit_memory", 838 .data = &sysctl_overcommit_memory, 839 .maxlen = sizeof(sysctl_overcommit_memory), 840 .mode = 0644, 841 .proc_handler = &proc_dointvec, 842 }, 843 { 844 .ctl_name = VM_PANIC_ON_OOM, 845 .procname = "panic_on_oom", 846 .data = &sysctl_panic_on_oom, 847 .maxlen = sizeof(sysctl_panic_on_oom), 848 .mode = 0644, 849 .proc_handler = &proc_dointvec, 850 }, 851 { 852 .ctl_name = CTL_UNNUMBERED, 853 .procname = "oom_kill_allocating_task", 854 .data = &sysctl_oom_kill_allocating_task, 855 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 856 .mode = 0644, 857 .proc_handler = &proc_dointvec, 858 }, 859 { 860 .ctl_name = CTL_UNNUMBERED, 861 .procname = "oom_dump_tasks", 862 .data = &sysctl_oom_dump_tasks, 863 .maxlen = sizeof(sysctl_oom_dump_tasks), 864 .mode = 0644, 865 .proc_handler = &proc_dointvec, 866 }, 867 { 868 .ctl_name = VM_OVERCOMMIT_RATIO, 869 .procname = "overcommit_ratio", 870 .data = &sysctl_overcommit_ratio, 871 .maxlen = sizeof(sysctl_overcommit_ratio), 872 .mode = 0644, 873 .proc_handler = &proc_dointvec, 874 }, 875 { 876 .ctl_name = VM_PAGE_CLUSTER, 877 .procname = "page-cluster", 878 .data = &page_cluster, 879 .maxlen = sizeof(int), 880 .mode = 0644, 881 .proc_handler = &proc_dointvec, 882 }, 883 { 884 .ctl_name = VM_DIRTY_BACKGROUND, 885 .procname = "dirty_background_ratio", 886 .data = &dirty_background_ratio, 887 .maxlen = sizeof(dirty_background_ratio), 888 .mode = 0644, 889 .proc_handler = &proc_dointvec_minmax, 890 .strategy = &sysctl_intvec, 891 .extra1 = &zero, 892 .extra2 = &one_hundred, 893 }, 894 { 895 .ctl_name = VM_DIRTY_RATIO, 896 .procname = "dirty_ratio", 897 .data = &vm_dirty_ratio, 898 .maxlen = sizeof(vm_dirty_ratio), 899 .mode = 0644, 900 .proc_handler = &dirty_ratio_handler, 901 .strategy = &sysctl_intvec, 902 .extra1 = &zero, 903 .extra2 = &one_hundred, 904 }, 905 { 906 .procname = "dirty_writeback_centisecs", 907 .data = &dirty_writeback_interval, 908 .maxlen = sizeof(dirty_writeback_interval), 909 .mode = 0644, 910 .proc_handler = &dirty_writeback_centisecs_handler, 911 }, 912 { 913 .procname = "dirty_expire_centisecs", 914 .data = &dirty_expire_interval, 915 .maxlen = sizeof(dirty_expire_interval), 916 .mode = 0644, 917 .proc_handler = &proc_dointvec_userhz_jiffies, 918 }, 919 { 920 .ctl_name = VM_NR_PDFLUSH_THREADS, 921 .procname = "nr_pdflush_threads", 922 .data = &nr_pdflush_threads, 923 .maxlen = sizeof nr_pdflush_threads, 924 .mode = 0444 /* read-only*/, 925 .proc_handler = &proc_dointvec, 926 }, 927 { 928 .ctl_name = VM_SWAPPINESS, 929 .procname = "swappiness", 930 .data = &vm_swappiness, 931 .maxlen = sizeof(vm_swappiness), 932 .mode = 0644, 933 .proc_handler = &proc_dointvec_minmax, 934 .strategy = &sysctl_intvec, 935 .extra1 = &zero, 936 .extra2 = &one_hundred, 937 }, 938 #ifdef CONFIG_HUGETLB_PAGE 939 { 940 .procname = "nr_hugepages", 941 .data = &max_huge_pages, 942 .maxlen = sizeof(unsigned long), 943 .mode = 0644, 944 .proc_handler = &hugetlb_sysctl_handler, 945 .extra1 = (void *)&hugetlb_zero, 946 .extra2 = (void *)&hugetlb_infinity, 947 }, 948 { 949 .ctl_name = VM_HUGETLB_GROUP, 950 .procname = "hugetlb_shm_group", 951 .data = &sysctl_hugetlb_shm_group, 952 .maxlen = sizeof(gid_t), 953 .mode = 0644, 954 .proc_handler = &proc_dointvec, 955 }, 956 { 957 .ctl_name = CTL_UNNUMBERED, 958 .procname = "hugepages_treat_as_movable", 959 .data = &hugepages_treat_as_movable, 960 .maxlen = sizeof(int), 961 .mode = 0644, 962 .proc_handler = &hugetlb_treat_movable_handler, 963 }, 964 { 965 .ctl_name = CTL_UNNUMBERED, 966 .procname = "nr_overcommit_hugepages", 967 .data = &sysctl_overcommit_huge_pages, 968 .maxlen = sizeof(sysctl_overcommit_huge_pages), 969 .mode = 0644, 970 .proc_handler = &hugetlb_overcommit_handler, 971 }, 972 #endif 973 { 974 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 975 .procname = "lowmem_reserve_ratio", 976 .data = &sysctl_lowmem_reserve_ratio, 977 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 978 .mode = 0644, 979 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 980 .strategy = &sysctl_intvec, 981 }, 982 { 983 .ctl_name = VM_DROP_PAGECACHE, 984 .procname = "drop_caches", 985 .data = &sysctl_drop_caches, 986 .maxlen = sizeof(int), 987 .mode = 0644, 988 .proc_handler = drop_caches_sysctl_handler, 989 .strategy = &sysctl_intvec, 990 }, 991 { 992 .ctl_name = VM_MIN_FREE_KBYTES, 993 .procname = "min_free_kbytes", 994 .data = &min_free_kbytes, 995 .maxlen = sizeof(min_free_kbytes), 996 .mode = 0644, 997 .proc_handler = &min_free_kbytes_sysctl_handler, 998 .strategy = &sysctl_intvec, 999 .extra1 = &zero, 1000 }, 1001 { 1002 .ctl_name = VM_PERCPU_PAGELIST_FRACTION, 1003 .procname = "percpu_pagelist_fraction", 1004 .data = &percpu_pagelist_fraction, 1005 .maxlen = sizeof(percpu_pagelist_fraction), 1006 .mode = 0644, 1007 .proc_handler = &percpu_pagelist_fraction_sysctl_handler, 1008 .strategy = &sysctl_intvec, 1009 .extra1 = &min_percpu_pagelist_fract, 1010 }, 1011 #ifdef CONFIG_MMU 1012 { 1013 .ctl_name = VM_MAX_MAP_COUNT, 1014 .procname = "max_map_count", 1015 .data = &sysctl_max_map_count, 1016 .maxlen = sizeof(sysctl_max_map_count), 1017 .mode = 0644, 1018 .proc_handler = &proc_dointvec 1019 }, 1020 #endif 1021 { 1022 .ctl_name = VM_LAPTOP_MODE, 1023 .procname = "laptop_mode", 1024 .data = &laptop_mode, 1025 .maxlen = sizeof(laptop_mode), 1026 .mode = 0644, 1027 .proc_handler = &proc_dointvec_jiffies, 1028 .strategy = &sysctl_jiffies, 1029 }, 1030 { 1031 .ctl_name = VM_BLOCK_DUMP, 1032 .procname = "block_dump", 1033 .data = &block_dump, 1034 .maxlen = sizeof(block_dump), 1035 .mode = 0644, 1036 .proc_handler = &proc_dointvec, 1037 .strategy = &sysctl_intvec, 1038 .extra1 = &zero, 1039 }, 1040 { 1041 .ctl_name = VM_VFS_CACHE_PRESSURE, 1042 .procname = "vfs_cache_pressure", 1043 .data = &sysctl_vfs_cache_pressure, 1044 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1045 .mode = 0644, 1046 .proc_handler = &proc_dointvec, 1047 .strategy = &sysctl_intvec, 1048 .extra1 = &zero, 1049 }, 1050 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1051 { 1052 .ctl_name = VM_LEGACY_VA_LAYOUT, 1053 .procname = "legacy_va_layout", 1054 .data = &sysctl_legacy_va_layout, 1055 .maxlen = sizeof(sysctl_legacy_va_layout), 1056 .mode = 0644, 1057 .proc_handler = &proc_dointvec, 1058 .strategy = &sysctl_intvec, 1059 .extra1 = &zero, 1060 }, 1061 #endif 1062 #ifdef CONFIG_NUMA 1063 { 1064 .ctl_name = VM_ZONE_RECLAIM_MODE, 1065 .procname = "zone_reclaim_mode", 1066 .data = &zone_reclaim_mode, 1067 .maxlen = sizeof(zone_reclaim_mode), 1068 .mode = 0644, 1069 .proc_handler = &proc_dointvec, 1070 .strategy = &sysctl_intvec, 1071 .extra1 = &zero, 1072 }, 1073 { 1074 .ctl_name = VM_MIN_UNMAPPED, 1075 .procname = "min_unmapped_ratio", 1076 .data = &sysctl_min_unmapped_ratio, 1077 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1078 .mode = 0644, 1079 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, 1080 .strategy = &sysctl_intvec, 1081 .extra1 = &zero, 1082 .extra2 = &one_hundred, 1083 }, 1084 { 1085 .ctl_name = VM_MIN_SLAB, 1086 .procname = "min_slab_ratio", 1087 .data = &sysctl_min_slab_ratio, 1088 .maxlen = sizeof(sysctl_min_slab_ratio), 1089 .mode = 0644, 1090 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, 1091 .strategy = &sysctl_intvec, 1092 .extra1 = &zero, 1093 .extra2 = &one_hundred, 1094 }, 1095 #endif 1096 #ifdef CONFIG_SMP 1097 { 1098 .ctl_name = CTL_UNNUMBERED, 1099 .procname = "stat_interval", 1100 .data = &sysctl_stat_interval, 1101 .maxlen = sizeof(sysctl_stat_interval), 1102 .mode = 0644, 1103 .proc_handler = &proc_dointvec_jiffies, 1104 .strategy = &sysctl_jiffies, 1105 }, 1106 #endif 1107 #ifdef CONFIG_SECURITY 1108 { 1109 .ctl_name = CTL_UNNUMBERED, 1110 .procname = "mmap_min_addr", 1111 .data = &mmap_min_addr, 1112 .maxlen = sizeof(unsigned long), 1113 .mode = 0644, 1114 .proc_handler = &proc_doulongvec_minmax, 1115 }, 1116 #endif 1117 #ifdef CONFIG_NUMA 1118 { 1119 .ctl_name = CTL_UNNUMBERED, 1120 .procname = "numa_zonelist_order", 1121 .data = &numa_zonelist_order, 1122 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1123 .mode = 0644, 1124 .proc_handler = &numa_zonelist_order_handler, 1125 .strategy = &sysctl_string, 1126 }, 1127 #endif 1128 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1129 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1130 { 1131 .ctl_name = VM_VDSO_ENABLED, 1132 .procname = "vdso_enabled", 1133 .data = &vdso_enabled, 1134 .maxlen = sizeof(vdso_enabled), 1135 .mode = 0644, 1136 .proc_handler = &proc_dointvec, 1137 .strategy = &sysctl_intvec, 1138 .extra1 = &zero, 1139 }, 1140 #endif 1141 #ifdef CONFIG_HIGHMEM 1142 { 1143 .ctl_name = CTL_UNNUMBERED, 1144 .procname = "highmem_is_dirtyable", 1145 .data = &vm_highmem_is_dirtyable, 1146 .maxlen = sizeof(vm_highmem_is_dirtyable), 1147 .mode = 0644, 1148 .proc_handler = &proc_dointvec_minmax, 1149 .strategy = &sysctl_intvec, 1150 .extra1 = &zero, 1151 .extra2 = &one, 1152 }, 1153 #endif 1154 /* 1155 * NOTE: do not add new entries to this table unless you have read 1156 * Documentation/sysctl/ctl_unnumbered.txt 1157 */ 1158 { .ctl_name = 0 } 1159 }; 1160 1161 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1162 static struct ctl_table binfmt_misc_table[] = { 1163 { .ctl_name = 0 } 1164 }; 1165 #endif 1166 1167 static struct ctl_table fs_table[] = { 1168 { 1169 .ctl_name = FS_NRINODE, 1170 .procname = "inode-nr", 1171 .data = &inodes_stat, 1172 .maxlen = 2*sizeof(int), 1173 .mode = 0444, 1174 .proc_handler = &proc_dointvec, 1175 }, 1176 { 1177 .ctl_name = FS_STATINODE, 1178 .procname = "inode-state", 1179 .data = &inodes_stat, 1180 .maxlen = 7*sizeof(int), 1181 .mode = 0444, 1182 .proc_handler = &proc_dointvec, 1183 }, 1184 { 1185 .procname = "file-nr", 1186 .data = &files_stat, 1187 .maxlen = 3*sizeof(int), 1188 .mode = 0444, 1189 .proc_handler = &proc_nr_files, 1190 }, 1191 { 1192 .ctl_name = FS_MAXFILE, 1193 .procname = "file-max", 1194 .data = &files_stat.max_files, 1195 .maxlen = sizeof(int), 1196 .mode = 0644, 1197 .proc_handler = &proc_dointvec, 1198 }, 1199 { 1200 .ctl_name = CTL_UNNUMBERED, 1201 .procname = "nr_open", 1202 .data = &sysctl_nr_open, 1203 .maxlen = sizeof(int), 1204 .mode = 0644, 1205 .proc_handler = &proc_dointvec_minmax, 1206 .extra1 = &sysctl_nr_open_min, 1207 .extra2 = &sysctl_nr_open_max, 1208 }, 1209 { 1210 .ctl_name = FS_DENTRY, 1211 .procname = "dentry-state", 1212 .data = &dentry_stat, 1213 .maxlen = 6*sizeof(int), 1214 .mode = 0444, 1215 .proc_handler = &proc_dointvec, 1216 }, 1217 { 1218 .ctl_name = FS_OVERFLOWUID, 1219 .procname = "overflowuid", 1220 .data = &fs_overflowuid, 1221 .maxlen = sizeof(int), 1222 .mode = 0644, 1223 .proc_handler = &proc_dointvec_minmax, 1224 .strategy = &sysctl_intvec, 1225 .extra1 = &minolduid, 1226 .extra2 = &maxolduid, 1227 }, 1228 { 1229 .ctl_name = FS_OVERFLOWGID, 1230 .procname = "overflowgid", 1231 .data = &fs_overflowgid, 1232 .maxlen = sizeof(int), 1233 .mode = 0644, 1234 .proc_handler = &proc_dointvec_minmax, 1235 .strategy = &sysctl_intvec, 1236 .extra1 = &minolduid, 1237 .extra2 = &maxolduid, 1238 }, 1239 { 1240 .ctl_name = FS_LEASES, 1241 .procname = "leases-enable", 1242 .data = &leases_enable, 1243 .maxlen = sizeof(int), 1244 .mode = 0644, 1245 .proc_handler = &proc_dointvec, 1246 }, 1247 #ifdef CONFIG_DNOTIFY 1248 { 1249 .ctl_name = FS_DIR_NOTIFY, 1250 .procname = "dir-notify-enable", 1251 .data = &dir_notify_enable, 1252 .maxlen = sizeof(int), 1253 .mode = 0644, 1254 .proc_handler = &proc_dointvec, 1255 }, 1256 #endif 1257 #ifdef CONFIG_MMU 1258 { 1259 .ctl_name = FS_LEASE_TIME, 1260 .procname = "lease-break-time", 1261 .data = &lease_break_time, 1262 .maxlen = sizeof(int), 1263 .mode = 0644, 1264 .proc_handler = &proc_dointvec_minmax, 1265 .strategy = &sysctl_intvec, 1266 .extra1 = &zero, 1267 .extra2 = &two, 1268 }, 1269 { 1270 .procname = "aio-nr", 1271 .data = &aio_nr, 1272 .maxlen = sizeof(aio_nr), 1273 .mode = 0444, 1274 .proc_handler = &proc_doulongvec_minmax, 1275 }, 1276 { 1277 .procname = "aio-max-nr", 1278 .data = &aio_max_nr, 1279 .maxlen = sizeof(aio_max_nr), 1280 .mode = 0644, 1281 .proc_handler = &proc_doulongvec_minmax, 1282 }, 1283 #ifdef CONFIG_INOTIFY_USER 1284 { 1285 .ctl_name = FS_INOTIFY, 1286 .procname = "inotify", 1287 .mode = 0555, 1288 .child = inotify_table, 1289 }, 1290 #endif 1291 #endif 1292 { 1293 .ctl_name = KERN_SETUID_DUMPABLE, 1294 .procname = "suid_dumpable", 1295 .data = &suid_dumpable, 1296 .maxlen = sizeof(int), 1297 .mode = 0644, 1298 .proc_handler = &proc_dointvec, 1299 }, 1300 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1301 { 1302 .ctl_name = CTL_UNNUMBERED, 1303 .procname = "binfmt_misc", 1304 .mode = 0555, 1305 .child = binfmt_misc_table, 1306 }, 1307 #endif 1308 /* 1309 * NOTE: do not add new entries to this table unless you have read 1310 * Documentation/sysctl/ctl_unnumbered.txt 1311 */ 1312 { .ctl_name = 0 } 1313 }; 1314 1315 static struct ctl_table debug_table[] = { 1316 #if defined(CONFIG_X86) || defined(CONFIG_PPC) 1317 { 1318 .ctl_name = CTL_UNNUMBERED, 1319 .procname = "exception-trace", 1320 .data = &show_unhandled_signals, 1321 .maxlen = sizeof(int), 1322 .mode = 0644, 1323 .proc_handler = proc_dointvec 1324 }, 1325 #endif 1326 { .ctl_name = 0 } 1327 }; 1328 1329 static struct ctl_table dev_table[] = { 1330 { .ctl_name = 0 } 1331 }; 1332 1333 static DEFINE_SPINLOCK(sysctl_lock); 1334 1335 /* called under sysctl_lock */ 1336 static int use_table(struct ctl_table_header *p) 1337 { 1338 if (unlikely(p->unregistering)) 1339 return 0; 1340 p->used++; 1341 return 1; 1342 } 1343 1344 /* called under sysctl_lock */ 1345 static void unuse_table(struct ctl_table_header *p) 1346 { 1347 if (!--p->used) 1348 if (unlikely(p->unregistering)) 1349 complete(p->unregistering); 1350 } 1351 1352 /* called under sysctl_lock, will reacquire if has to wait */ 1353 static void start_unregistering(struct ctl_table_header *p) 1354 { 1355 /* 1356 * if p->used is 0, nobody will ever touch that entry again; 1357 * we'll eliminate all paths to it before dropping sysctl_lock 1358 */ 1359 if (unlikely(p->used)) { 1360 struct completion wait; 1361 init_completion(&wait); 1362 p->unregistering = &wait; 1363 spin_unlock(&sysctl_lock); 1364 wait_for_completion(&wait); 1365 spin_lock(&sysctl_lock); 1366 } 1367 /* 1368 * do not remove from the list until nobody holds it; walking the 1369 * list in do_sysctl() relies on that. 1370 */ 1371 list_del_init(&p->ctl_entry); 1372 } 1373 1374 void sysctl_head_finish(struct ctl_table_header *head) 1375 { 1376 if (!head) 1377 return; 1378 spin_lock(&sysctl_lock); 1379 unuse_table(head); 1380 spin_unlock(&sysctl_lock); 1381 } 1382 1383 static struct list_head * 1384 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1385 { 1386 struct list_head *header_list; 1387 header_list = &root->header_list; 1388 if (root->lookup) 1389 header_list = root->lookup(root, namespaces); 1390 return header_list; 1391 } 1392 1393 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1394 struct ctl_table_header *prev) 1395 { 1396 struct ctl_table_root *root; 1397 struct list_head *header_list; 1398 struct ctl_table_header *head; 1399 struct list_head *tmp; 1400 1401 spin_lock(&sysctl_lock); 1402 if (prev) { 1403 head = prev; 1404 tmp = &prev->ctl_entry; 1405 unuse_table(prev); 1406 goto next; 1407 } 1408 tmp = &root_table_header.ctl_entry; 1409 for (;;) { 1410 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1411 1412 if (!use_table(head)) 1413 goto next; 1414 spin_unlock(&sysctl_lock); 1415 return head; 1416 next: 1417 root = head->root; 1418 tmp = tmp->next; 1419 header_list = lookup_header_list(root, namespaces); 1420 if (tmp != header_list) 1421 continue; 1422 1423 do { 1424 root = list_entry(root->root_list.next, 1425 struct ctl_table_root, root_list); 1426 if (root == &sysctl_table_root) 1427 goto out; 1428 header_list = lookup_header_list(root, namespaces); 1429 } while (list_empty(header_list)); 1430 tmp = header_list->next; 1431 } 1432 out: 1433 spin_unlock(&sysctl_lock); 1434 return NULL; 1435 } 1436 1437 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1438 { 1439 return __sysctl_head_next(current->nsproxy, prev); 1440 } 1441 1442 void register_sysctl_root(struct ctl_table_root *root) 1443 { 1444 spin_lock(&sysctl_lock); 1445 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1446 spin_unlock(&sysctl_lock); 1447 } 1448 1449 #ifdef CONFIG_SYSCTL_SYSCALL 1450 /* Perform the actual read/write of a sysctl table entry. */ 1451 static int do_sysctl_strategy(struct ctl_table_root *root, 1452 struct ctl_table *table, 1453 int __user *name, int nlen, 1454 void __user *oldval, size_t __user *oldlenp, 1455 void __user *newval, size_t newlen) 1456 { 1457 int op = 0, rc; 1458 1459 if (oldval) 1460 op |= 004; 1461 if (newval) 1462 op |= 002; 1463 if (sysctl_perm(root, table, op)) 1464 return -EPERM; 1465 1466 if (table->strategy) { 1467 rc = table->strategy(table, name, nlen, oldval, oldlenp, 1468 newval, newlen); 1469 if (rc < 0) 1470 return rc; 1471 if (rc > 0) 1472 return 0; 1473 } 1474 1475 /* If there is no strategy routine, or if the strategy returns 1476 * zero, proceed with automatic r/w */ 1477 if (table->data && table->maxlen) { 1478 rc = sysctl_data(table, name, nlen, oldval, oldlenp, 1479 newval, newlen); 1480 if (rc < 0) 1481 return rc; 1482 } 1483 return 0; 1484 } 1485 1486 static int parse_table(int __user *name, int nlen, 1487 void __user *oldval, size_t __user *oldlenp, 1488 void __user *newval, size_t newlen, 1489 struct ctl_table_root *root, 1490 struct ctl_table *table) 1491 { 1492 int n; 1493 repeat: 1494 if (!nlen) 1495 return -ENOTDIR; 1496 if (get_user(n, name)) 1497 return -EFAULT; 1498 for ( ; table->ctl_name || table->procname; table++) { 1499 if (!table->ctl_name) 1500 continue; 1501 if (n == table->ctl_name) { 1502 int error; 1503 if (table->child) { 1504 if (sysctl_perm(root, table, 001)) 1505 return -EPERM; 1506 name++; 1507 nlen--; 1508 table = table->child; 1509 goto repeat; 1510 } 1511 error = do_sysctl_strategy(root, table, name, nlen, 1512 oldval, oldlenp, 1513 newval, newlen); 1514 return error; 1515 } 1516 } 1517 return -ENOTDIR; 1518 } 1519 1520 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1521 void __user *newval, size_t newlen) 1522 { 1523 struct ctl_table_header *head; 1524 int error = -ENOTDIR; 1525 1526 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1527 return -ENOTDIR; 1528 if (oldval) { 1529 int old_len; 1530 if (!oldlenp || get_user(old_len, oldlenp)) 1531 return -EFAULT; 1532 } 1533 1534 for (head = sysctl_head_next(NULL); head; 1535 head = sysctl_head_next(head)) { 1536 error = parse_table(name, nlen, oldval, oldlenp, 1537 newval, newlen, 1538 head->root, head->ctl_table); 1539 if (error != -ENOTDIR) { 1540 sysctl_head_finish(head); 1541 break; 1542 } 1543 } 1544 return error; 1545 } 1546 1547 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 1548 { 1549 struct __sysctl_args tmp; 1550 int error; 1551 1552 if (copy_from_user(&tmp, args, sizeof(tmp))) 1553 return -EFAULT; 1554 1555 error = deprecated_sysctl_warning(&tmp); 1556 if (error) 1557 goto out; 1558 1559 lock_kernel(); 1560 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1561 tmp.newval, tmp.newlen); 1562 unlock_kernel(); 1563 out: 1564 return error; 1565 } 1566 #endif /* CONFIG_SYSCTL_SYSCALL */ 1567 1568 /* 1569 * sysctl_perm does NOT grant the superuser all rights automatically, because 1570 * some sysctl variables are readonly even to root. 1571 */ 1572 1573 static int test_perm(int mode, int op) 1574 { 1575 if (!current->euid) 1576 mode >>= 6; 1577 else if (in_egroup_p(0)) 1578 mode >>= 3; 1579 if ((mode & op & 0007) == op) 1580 return 0; 1581 return -EACCES; 1582 } 1583 1584 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1585 { 1586 int error; 1587 int mode; 1588 1589 error = security_sysctl(table, op); 1590 if (error) 1591 return error; 1592 1593 if (root->permissions) 1594 mode = root->permissions(root, current->nsproxy, table); 1595 else 1596 mode = table->mode; 1597 1598 return test_perm(mode, op); 1599 } 1600 1601 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1602 { 1603 for (; table->ctl_name || table->procname; table++) { 1604 table->parent = parent; 1605 if (table->child) 1606 sysctl_set_parent(table, table->child); 1607 } 1608 } 1609 1610 static __init int sysctl_init(void) 1611 { 1612 sysctl_set_parent(NULL, root_table); 1613 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1614 { 1615 int err; 1616 err = sysctl_check_table(current->nsproxy, root_table); 1617 } 1618 #endif 1619 return 0; 1620 } 1621 1622 core_initcall(sysctl_init); 1623 1624 /** 1625 * __register_sysctl_paths - register a sysctl hierarchy 1626 * @root: List of sysctl headers to register on 1627 * @namespaces: Data to compute which lists of sysctl entries are visible 1628 * @path: The path to the directory the sysctl table is in. 1629 * @table: the top-level table structure 1630 * 1631 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1632 * array. A completely 0 filled entry terminates the table. 1633 * 1634 * The members of the &struct ctl_table structure are used as follows: 1635 * 1636 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1637 * must be unique within that level of sysctl 1638 * 1639 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1640 * enter a sysctl file 1641 * 1642 * data - a pointer to data for use by proc_handler 1643 * 1644 * maxlen - the maximum size in bytes of the data 1645 * 1646 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1647 * 1648 * child - a pointer to the child sysctl table if this entry is a directory, or 1649 * %NULL. 1650 * 1651 * proc_handler - the text handler routine (described below) 1652 * 1653 * strategy - the strategy routine (described below) 1654 * 1655 * de - for internal use by the sysctl routines 1656 * 1657 * extra1, extra2 - extra pointers usable by the proc handler routines 1658 * 1659 * Leaf nodes in the sysctl tree will be represented by a single file 1660 * under /proc; non-leaf nodes will be represented by directories. 1661 * 1662 * sysctl(2) can automatically manage read and write requests through 1663 * the sysctl table. The data and maxlen fields of the ctl_table 1664 * struct enable minimal validation of the values being written to be 1665 * performed, and the mode field allows minimal authentication. 1666 * 1667 * More sophisticated management can be enabled by the provision of a 1668 * strategy routine with the table entry. This will be called before 1669 * any automatic read or write of the data is performed. 1670 * 1671 * The strategy routine may return 1672 * 1673 * < 0 - Error occurred (error is passed to user process) 1674 * 1675 * 0 - OK - proceed with automatic read or write. 1676 * 1677 * > 0 - OK - read or write has been done by the strategy routine, so 1678 * return immediately. 1679 * 1680 * There must be a proc_handler routine for any terminal nodes 1681 * mirrored under /proc/sys (non-terminals are handled by a built-in 1682 * directory handler). Several default handlers are available to 1683 * cover common cases - 1684 * 1685 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1686 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1687 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1688 * 1689 * It is the handler's job to read the input buffer from user memory 1690 * and process it. The handler should return 0 on success. 1691 * 1692 * This routine returns %NULL on a failure to register, and a pointer 1693 * to the table header on success. 1694 */ 1695 struct ctl_table_header *__register_sysctl_paths( 1696 struct ctl_table_root *root, 1697 struct nsproxy *namespaces, 1698 const struct ctl_path *path, struct ctl_table *table) 1699 { 1700 struct list_head *header_list; 1701 struct ctl_table_header *header; 1702 struct ctl_table *new, **prevp; 1703 unsigned int n, npath; 1704 1705 /* Count the path components */ 1706 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) 1707 ; 1708 1709 /* 1710 * For each path component, allocate a 2-element ctl_table array. 1711 * The first array element will be filled with the sysctl entry 1712 * for this, the second will be the sentinel (ctl_name == 0). 1713 * 1714 * We allocate everything in one go so that we don't have to 1715 * worry about freeing additional memory in unregister_sysctl_table. 1716 */ 1717 header = kzalloc(sizeof(struct ctl_table_header) + 1718 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1719 if (!header) 1720 return NULL; 1721 1722 new = (struct ctl_table *) (header + 1); 1723 1724 /* Now connect the dots */ 1725 prevp = &header->ctl_table; 1726 for (n = 0; n < npath; ++n, ++path) { 1727 /* Copy the procname */ 1728 new->procname = path->procname; 1729 new->ctl_name = path->ctl_name; 1730 new->mode = 0555; 1731 1732 *prevp = new; 1733 prevp = &new->child; 1734 1735 new += 2; 1736 } 1737 *prevp = table; 1738 header->ctl_table_arg = table; 1739 1740 INIT_LIST_HEAD(&header->ctl_entry); 1741 header->used = 0; 1742 header->unregistering = NULL; 1743 header->root = root; 1744 sysctl_set_parent(NULL, header->ctl_table); 1745 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1746 if (sysctl_check_table(namespaces, header->ctl_table)) { 1747 kfree(header); 1748 return NULL; 1749 } 1750 #endif 1751 spin_lock(&sysctl_lock); 1752 header_list = lookup_header_list(root, namespaces); 1753 list_add_tail(&header->ctl_entry, header_list); 1754 spin_unlock(&sysctl_lock); 1755 1756 return header; 1757 } 1758 1759 /** 1760 * register_sysctl_table_path - register a sysctl table hierarchy 1761 * @path: The path to the directory the sysctl table is in. 1762 * @table: the top-level table structure 1763 * 1764 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1765 * array. A completely 0 filled entry terminates the table. 1766 * 1767 * See __register_sysctl_paths for more details. 1768 */ 1769 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1770 struct ctl_table *table) 1771 { 1772 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1773 path, table); 1774 } 1775 1776 /** 1777 * register_sysctl_table - register a sysctl table hierarchy 1778 * @table: the top-level table structure 1779 * 1780 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1781 * array. A completely 0 filled entry terminates the table. 1782 * 1783 * See register_sysctl_paths for more details. 1784 */ 1785 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1786 { 1787 static const struct ctl_path null_path[] = { {} }; 1788 1789 return register_sysctl_paths(null_path, table); 1790 } 1791 1792 /** 1793 * unregister_sysctl_table - unregister a sysctl table hierarchy 1794 * @header: the header returned from register_sysctl_table 1795 * 1796 * Unregisters the sysctl table and all children. proc entries may not 1797 * actually be removed until they are no longer used by anyone. 1798 */ 1799 void unregister_sysctl_table(struct ctl_table_header * header) 1800 { 1801 might_sleep(); 1802 1803 if (header == NULL) 1804 return; 1805 1806 spin_lock(&sysctl_lock); 1807 start_unregistering(header); 1808 spin_unlock(&sysctl_lock); 1809 kfree(header); 1810 } 1811 1812 #else /* !CONFIG_SYSCTL */ 1813 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1814 { 1815 return NULL; 1816 } 1817 1818 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1819 struct ctl_table *table) 1820 { 1821 return NULL; 1822 } 1823 1824 void unregister_sysctl_table(struct ctl_table_header * table) 1825 { 1826 } 1827 1828 #endif /* CONFIG_SYSCTL */ 1829 1830 /* 1831 * /proc/sys support 1832 */ 1833 1834 #ifdef CONFIG_PROC_SYSCTL 1835 1836 static int _proc_do_string(void* data, int maxlen, int write, 1837 struct file *filp, void __user *buffer, 1838 size_t *lenp, loff_t *ppos) 1839 { 1840 size_t len; 1841 char __user *p; 1842 char c; 1843 1844 if (!data || !maxlen || !*lenp) { 1845 *lenp = 0; 1846 return 0; 1847 } 1848 1849 if (write) { 1850 len = 0; 1851 p = buffer; 1852 while (len < *lenp) { 1853 if (get_user(c, p++)) 1854 return -EFAULT; 1855 if (c == 0 || c == '\n') 1856 break; 1857 len++; 1858 } 1859 if (len >= maxlen) 1860 len = maxlen-1; 1861 if(copy_from_user(data, buffer, len)) 1862 return -EFAULT; 1863 ((char *) data)[len] = 0; 1864 *ppos += *lenp; 1865 } else { 1866 len = strlen(data); 1867 if (len > maxlen) 1868 len = maxlen; 1869 1870 if (*ppos > len) { 1871 *lenp = 0; 1872 return 0; 1873 } 1874 1875 data += *ppos; 1876 len -= *ppos; 1877 1878 if (len > *lenp) 1879 len = *lenp; 1880 if (len) 1881 if(copy_to_user(buffer, data, len)) 1882 return -EFAULT; 1883 if (len < *lenp) { 1884 if(put_user('\n', ((char __user *) buffer) + len)) 1885 return -EFAULT; 1886 len++; 1887 } 1888 *lenp = len; 1889 *ppos += len; 1890 } 1891 return 0; 1892 } 1893 1894 /** 1895 * proc_dostring - read a string sysctl 1896 * @table: the sysctl table 1897 * @write: %TRUE if this is a write to the sysctl file 1898 * @filp: the file structure 1899 * @buffer: the user buffer 1900 * @lenp: the size of the user buffer 1901 * @ppos: file position 1902 * 1903 * Reads/writes a string from/to the user buffer. If the kernel 1904 * buffer provided is not large enough to hold the string, the 1905 * string is truncated. The copied string is %NULL-terminated. 1906 * If the string is being read by the user process, it is copied 1907 * and a newline '\n' is added. It is truncated if the buffer is 1908 * not large enough. 1909 * 1910 * Returns 0 on success. 1911 */ 1912 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 1913 void __user *buffer, size_t *lenp, loff_t *ppos) 1914 { 1915 return _proc_do_string(table->data, table->maxlen, write, filp, 1916 buffer, lenp, ppos); 1917 } 1918 1919 1920 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 1921 int *valp, 1922 int write, void *data) 1923 { 1924 if (write) { 1925 *valp = *negp ? -*lvalp : *lvalp; 1926 } else { 1927 int val = *valp; 1928 if (val < 0) { 1929 *negp = -1; 1930 *lvalp = (unsigned long)-val; 1931 } else { 1932 *negp = 0; 1933 *lvalp = (unsigned long)val; 1934 } 1935 } 1936 return 0; 1937 } 1938 1939 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1940 int write, struct file *filp, void __user *buffer, 1941 size_t *lenp, loff_t *ppos, 1942 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 1943 int write, void *data), 1944 void *data) 1945 { 1946 #define TMPBUFLEN 21 1947 int *i, vleft, first=1, neg, val; 1948 unsigned long lval; 1949 size_t left, len; 1950 1951 char buf[TMPBUFLEN], *p; 1952 char __user *s = buffer; 1953 1954 if (!tbl_data || !table->maxlen || !*lenp || 1955 (*ppos && !write)) { 1956 *lenp = 0; 1957 return 0; 1958 } 1959 1960 i = (int *) tbl_data; 1961 vleft = table->maxlen / sizeof(*i); 1962 left = *lenp; 1963 1964 if (!conv) 1965 conv = do_proc_dointvec_conv; 1966 1967 for (; left && vleft--; i++, first=0) { 1968 if (write) { 1969 while (left) { 1970 char c; 1971 if (get_user(c, s)) 1972 return -EFAULT; 1973 if (!isspace(c)) 1974 break; 1975 left--; 1976 s++; 1977 } 1978 if (!left) 1979 break; 1980 neg = 0; 1981 len = left; 1982 if (len > sizeof(buf) - 1) 1983 len = sizeof(buf) - 1; 1984 if (copy_from_user(buf, s, len)) 1985 return -EFAULT; 1986 buf[len] = 0; 1987 p = buf; 1988 if (*p == '-' && left > 1) { 1989 neg = 1; 1990 p++; 1991 } 1992 if (*p < '0' || *p > '9') 1993 break; 1994 1995 lval = simple_strtoul(p, &p, 0); 1996 1997 len = p-buf; 1998 if ((len < left) && *p && !isspace(*p)) 1999 break; 2000 if (neg) 2001 val = -val; 2002 s += len; 2003 left -= len; 2004 2005 if (conv(&neg, &lval, i, 1, data)) 2006 break; 2007 } else { 2008 p = buf; 2009 if (!first) 2010 *p++ = '\t'; 2011 2012 if (conv(&neg, &lval, i, 0, data)) 2013 break; 2014 2015 sprintf(p, "%s%lu", neg ? "-" : "", lval); 2016 len = strlen(buf); 2017 if (len > left) 2018 len = left; 2019 if(copy_to_user(s, buf, len)) 2020 return -EFAULT; 2021 left -= len; 2022 s += len; 2023 } 2024 } 2025 2026 if (!write && !first && left) { 2027 if(put_user('\n', s)) 2028 return -EFAULT; 2029 left--, s++; 2030 } 2031 if (write) { 2032 while (left) { 2033 char c; 2034 if (get_user(c, s++)) 2035 return -EFAULT; 2036 if (!isspace(c)) 2037 break; 2038 left--; 2039 } 2040 } 2041 if (write && first) 2042 return -EINVAL; 2043 *lenp -= left; 2044 *ppos += *lenp; 2045 return 0; 2046 #undef TMPBUFLEN 2047 } 2048 2049 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2050 void __user *buffer, size_t *lenp, loff_t *ppos, 2051 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2052 int write, void *data), 2053 void *data) 2054 { 2055 return __do_proc_dointvec(table->data, table, write, filp, 2056 buffer, lenp, ppos, conv, data); 2057 } 2058 2059 /** 2060 * proc_dointvec - read a vector of integers 2061 * @table: the sysctl table 2062 * @write: %TRUE if this is a write to the sysctl file 2063 * @filp: the file structure 2064 * @buffer: the user buffer 2065 * @lenp: the size of the user buffer 2066 * @ppos: file position 2067 * 2068 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2069 * values from/to the user buffer, treated as an ASCII string. 2070 * 2071 * Returns 0 on success. 2072 */ 2073 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2074 void __user *buffer, size_t *lenp, loff_t *ppos) 2075 { 2076 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2077 NULL,NULL); 2078 } 2079 2080 #define OP_SET 0 2081 #define OP_AND 1 2082 #define OP_OR 2 2083 2084 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, 2085 int *valp, 2086 int write, void *data) 2087 { 2088 int op = *(int *)data; 2089 if (write) { 2090 int val = *negp ? -*lvalp : *lvalp; 2091 switch(op) { 2092 case OP_SET: *valp = val; break; 2093 case OP_AND: *valp &= val; break; 2094 case OP_OR: *valp |= val; break; 2095 } 2096 } else { 2097 int val = *valp; 2098 if (val < 0) { 2099 *negp = -1; 2100 *lvalp = (unsigned long)-val; 2101 } else { 2102 *negp = 0; 2103 *lvalp = (unsigned long)val; 2104 } 2105 } 2106 return 0; 2107 } 2108 2109 /* 2110 * Taint values can only be increased 2111 */ 2112 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, 2113 void __user *buffer, size_t *lenp, loff_t *ppos) 2114 { 2115 int op; 2116 2117 if (write && !capable(CAP_SYS_ADMIN)) 2118 return -EPERM; 2119 2120 op = OP_OR; 2121 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2122 do_proc_dointvec_bset_conv,&op); 2123 } 2124 2125 struct do_proc_dointvec_minmax_conv_param { 2126 int *min; 2127 int *max; 2128 }; 2129 2130 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 2131 int *valp, 2132 int write, void *data) 2133 { 2134 struct do_proc_dointvec_minmax_conv_param *param = data; 2135 if (write) { 2136 int val = *negp ? -*lvalp : *lvalp; 2137 if ((param->min && *param->min > val) || 2138 (param->max && *param->max < val)) 2139 return -EINVAL; 2140 *valp = val; 2141 } else { 2142 int val = *valp; 2143 if (val < 0) { 2144 *negp = -1; 2145 *lvalp = (unsigned long)-val; 2146 } else { 2147 *negp = 0; 2148 *lvalp = (unsigned long)val; 2149 } 2150 } 2151 return 0; 2152 } 2153 2154 /** 2155 * proc_dointvec_minmax - read a vector of integers with min/max values 2156 * @table: the sysctl table 2157 * @write: %TRUE if this is a write to the sysctl file 2158 * @filp: the file structure 2159 * @buffer: the user buffer 2160 * @lenp: the size of the user buffer 2161 * @ppos: file position 2162 * 2163 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2164 * values from/to the user buffer, treated as an ASCII string. 2165 * 2166 * This routine will ensure the values are within the range specified by 2167 * table->extra1 (min) and table->extra2 (max). 2168 * 2169 * Returns 0 on success. 2170 */ 2171 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2172 void __user *buffer, size_t *lenp, loff_t *ppos) 2173 { 2174 struct do_proc_dointvec_minmax_conv_param param = { 2175 .min = (int *) table->extra1, 2176 .max = (int *) table->extra2, 2177 }; 2178 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2179 do_proc_dointvec_minmax_conv, ¶m); 2180 } 2181 2182 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2183 struct file *filp, 2184 void __user *buffer, 2185 size_t *lenp, loff_t *ppos, 2186 unsigned long convmul, 2187 unsigned long convdiv) 2188 { 2189 #define TMPBUFLEN 21 2190 unsigned long *i, *min, *max, val; 2191 int vleft, first=1, neg; 2192 size_t len, left; 2193 char buf[TMPBUFLEN], *p; 2194 char __user *s = buffer; 2195 2196 if (!data || !table->maxlen || !*lenp || 2197 (*ppos && !write)) { 2198 *lenp = 0; 2199 return 0; 2200 } 2201 2202 i = (unsigned long *) data; 2203 min = (unsigned long *) table->extra1; 2204 max = (unsigned long *) table->extra2; 2205 vleft = table->maxlen / sizeof(unsigned long); 2206 left = *lenp; 2207 2208 for (; left && vleft--; i++, min++, max++, first=0) { 2209 if (write) { 2210 while (left) { 2211 char c; 2212 if (get_user(c, s)) 2213 return -EFAULT; 2214 if (!isspace(c)) 2215 break; 2216 left--; 2217 s++; 2218 } 2219 if (!left) 2220 break; 2221 neg = 0; 2222 len = left; 2223 if (len > TMPBUFLEN-1) 2224 len = TMPBUFLEN-1; 2225 if (copy_from_user(buf, s, len)) 2226 return -EFAULT; 2227 buf[len] = 0; 2228 p = buf; 2229 if (*p == '-' && left > 1) { 2230 neg = 1; 2231 p++; 2232 } 2233 if (*p < '0' || *p > '9') 2234 break; 2235 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 2236 len = p-buf; 2237 if ((len < left) && *p && !isspace(*p)) 2238 break; 2239 if (neg) 2240 val = -val; 2241 s += len; 2242 left -= len; 2243 2244 if(neg) 2245 continue; 2246 if ((min && val < *min) || (max && val > *max)) 2247 continue; 2248 *i = val; 2249 } else { 2250 p = buf; 2251 if (!first) 2252 *p++ = '\t'; 2253 sprintf(p, "%lu", convdiv * (*i) / convmul); 2254 len = strlen(buf); 2255 if (len > left) 2256 len = left; 2257 if(copy_to_user(s, buf, len)) 2258 return -EFAULT; 2259 left -= len; 2260 s += len; 2261 } 2262 } 2263 2264 if (!write && !first && left) { 2265 if(put_user('\n', s)) 2266 return -EFAULT; 2267 left--, s++; 2268 } 2269 if (write) { 2270 while (left) { 2271 char c; 2272 if (get_user(c, s++)) 2273 return -EFAULT; 2274 if (!isspace(c)) 2275 break; 2276 left--; 2277 } 2278 } 2279 if (write && first) 2280 return -EINVAL; 2281 *lenp -= left; 2282 *ppos += *lenp; 2283 return 0; 2284 #undef TMPBUFLEN 2285 } 2286 2287 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2288 struct file *filp, 2289 void __user *buffer, 2290 size_t *lenp, loff_t *ppos, 2291 unsigned long convmul, 2292 unsigned long convdiv) 2293 { 2294 return __do_proc_doulongvec_minmax(table->data, table, write, 2295 filp, buffer, lenp, ppos, convmul, convdiv); 2296 } 2297 2298 /** 2299 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2300 * @table: the sysctl table 2301 * @write: %TRUE if this is a write to the sysctl file 2302 * @filp: the file structure 2303 * @buffer: the user buffer 2304 * @lenp: the size of the user buffer 2305 * @ppos: file position 2306 * 2307 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2308 * values from/to the user buffer, treated as an ASCII string. 2309 * 2310 * This routine will ensure the values are within the range specified by 2311 * table->extra1 (min) and table->extra2 (max). 2312 * 2313 * Returns 0 on success. 2314 */ 2315 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2316 void __user *buffer, size_t *lenp, loff_t *ppos) 2317 { 2318 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 2319 } 2320 2321 /** 2322 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2323 * @table: the sysctl table 2324 * @write: %TRUE if this is a write to the sysctl file 2325 * @filp: the file structure 2326 * @buffer: the user buffer 2327 * @lenp: the size of the user buffer 2328 * @ppos: file position 2329 * 2330 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2331 * values from/to the user buffer, treated as an ASCII string. The values 2332 * are treated as milliseconds, and converted to jiffies when they are stored. 2333 * 2334 * This routine will ensure the values are within the range specified by 2335 * table->extra1 (min) and table->extra2 (max). 2336 * 2337 * Returns 0 on success. 2338 */ 2339 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2340 struct file *filp, 2341 void __user *buffer, 2342 size_t *lenp, loff_t *ppos) 2343 { 2344 return do_proc_doulongvec_minmax(table, write, filp, buffer, 2345 lenp, ppos, HZ, 1000l); 2346 } 2347 2348 2349 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2350 int *valp, 2351 int write, void *data) 2352 { 2353 if (write) { 2354 if (*lvalp > LONG_MAX / HZ) 2355 return 1; 2356 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2357 } else { 2358 int val = *valp; 2359 unsigned long lval; 2360 if (val < 0) { 2361 *negp = -1; 2362 lval = (unsigned long)-val; 2363 } else { 2364 *negp = 0; 2365 lval = (unsigned long)val; 2366 } 2367 *lvalp = lval / HZ; 2368 } 2369 return 0; 2370 } 2371 2372 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2373 int *valp, 2374 int write, void *data) 2375 { 2376 if (write) { 2377 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2378 return 1; 2379 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2380 } else { 2381 int val = *valp; 2382 unsigned long lval; 2383 if (val < 0) { 2384 *negp = -1; 2385 lval = (unsigned long)-val; 2386 } else { 2387 *negp = 0; 2388 lval = (unsigned long)val; 2389 } 2390 *lvalp = jiffies_to_clock_t(lval); 2391 } 2392 return 0; 2393 } 2394 2395 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2396 int *valp, 2397 int write, void *data) 2398 { 2399 if (write) { 2400 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2401 } else { 2402 int val = *valp; 2403 unsigned long lval; 2404 if (val < 0) { 2405 *negp = -1; 2406 lval = (unsigned long)-val; 2407 } else { 2408 *negp = 0; 2409 lval = (unsigned long)val; 2410 } 2411 *lvalp = jiffies_to_msecs(lval); 2412 } 2413 return 0; 2414 } 2415 2416 /** 2417 * proc_dointvec_jiffies - read a vector of integers as seconds 2418 * @table: the sysctl table 2419 * @write: %TRUE if this is a write to the sysctl file 2420 * @filp: the file structure 2421 * @buffer: the user buffer 2422 * @lenp: the size of the user buffer 2423 * @ppos: file position 2424 * 2425 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2426 * values from/to the user buffer, treated as an ASCII string. 2427 * The values read are assumed to be in seconds, and are converted into 2428 * jiffies. 2429 * 2430 * Returns 0 on success. 2431 */ 2432 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2433 void __user *buffer, size_t *lenp, loff_t *ppos) 2434 { 2435 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2436 do_proc_dointvec_jiffies_conv,NULL); 2437 } 2438 2439 /** 2440 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2441 * @table: the sysctl table 2442 * @write: %TRUE if this is a write to the sysctl file 2443 * @filp: the file structure 2444 * @buffer: the user buffer 2445 * @lenp: the size of the user buffer 2446 * @ppos: pointer to the file position 2447 * 2448 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2449 * values from/to the user buffer, treated as an ASCII string. 2450 * The values read are assumed to be in 1/USER_HZ seconds, and 2451 * are converted into jiffies. 2452 * 2453 * Returns 0 on success. 2454 */ 2455 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2456 void __user *buffer, size_t *lenp, loff_t *ppos) 2457 { 2458 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2459 do_proc_dointvec_userhz_jiffies_conv,NULL); 2460 } 2461 2462 /** 2463 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2464 * @table: the sysctl table 2465 * @write: %TRUE if this is a write to the sysctl file 2466 * @filp: the file structure 2467 * @buffer: the user buffer 2468 * @lenp: the size of the user buffer 2469 * @ppos: file position 2470 * @ppos: the current position in the file 2471 * 2472 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2473 * values from/to the user buffer, treated as an ASCII string. 2474 * The values read are assumed to be in 1/1000 seconds, and 2475 * are converted into jiffies. 2476 * 2477 * Returns 0 on success. 2478 */ 2479 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2480 void __user *buffer, size_t *lenp, loff_t *ppos) 2481 { 2482 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2483 do_proc_dointvec_ms_jiffies_conv, NULL); 2484 } 2485 2486 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 2487 void __user *buffer, size_t *lenp, loff_t *ppos) 2488 { 2489 struct pid *new_pid; 2490 pid_t tmp; 2491 int r; 2492 2493 tmp = pid_vnr(cad_pid); 2494 2495 r = __do_proc_dointvec(&tmp, table, write, filp, buffer, 2496 lenp, ppos, NULL, NULL); 2497 if (r || !write) 2498 return r; 2499 2500 new_pid = find_get_pid(tmp); 2501 if (!new_pid) 2502 return -ESRCH; 2503 2504 put_pid(xchg(&cad_pid, new_pid)); 2505 return 0; 2506 } 2507 2508 #else /* CONFIG_PROC_FS */ 2509 2510 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2511 void __user *buffer, size_t *lenp, loff_t *ppos) 2512 { 2513 return -ENOSYS; 2514 } 2515 2516 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2517 void __user *buffer, size_t *lenp, loff_t *ppos) 2518 { 2519 return -ENOSYS; 2520 } 2521 2522 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2523 void __user *buffer, size_t *lenp, loff_t *ppos) 2524 { 2525 return -ENOSYS; 2526 } 2527 2528 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2529 void __user *buffer, size_t *lenp, loff_t *ppos) 2530 { 2531 return -ENOSYS; 2532 } 2533 2534 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2535 void __user *buffer, size_t *lenp, loff_t *ppos) 2536 { 2537 return -ENOSYS; 2538 } 2539 2540 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2541 void __user *buffer, size_t *lenp, loff_t *ppos) 2542 { 2543 return -ENOSYS; 2544 } 2545 2546 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2547 void __user *buffer, size_t *lenp, loff_t *ppos) 2548 { 2549 return -ENOSYS; 2550 } 2551 2552 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2553 struct file *filp, 2554 void __user *buffer, 2555 size_t *lenp, loff_t *ppos) 2556 { 2557 return -ENOSYS; 2558 } 2559 2560 2561 #endif /* CONFIG_PROC_FS */ 2562 2563 2564 #ifdef CONFIG_SYSCTL_SYSCALL 2565 /* 2566 * General sysctl support routines 2567 */ 2568 2569 /* The generic sysctl data routine (used if no strategy routine supplied) */ 2570 int sysctl_data(struct ctl_table *table, int __user *name, int nlen, 2571 void __user *oldval, size_t __user *oldlenp, 2572 void __user *newval, size_t newlen) 2573 { 2574 size_t len; 2575 2576 /* Get out of I don't have a variable */ 2577 if (!table->data || !table->maxlen) 2578 return -ENOTDIR; 2579 2580 if (oldval && oldlenp) { 2581 if (get_user(len, oldlenp)) 2582 return -EFAULT; 2583 if (len) { 2584 if (len > table->maxlen) 2585 len = table->maxlen; 2586 if (copy_to_user(oldval, table->data, len)) 2587 return -EFAULT; 2588 if (put_user(len, oldlenp)) 2589 return -EFAULT; 2590 } 2591 } 2592 2593 if (newval && newlen) { 2594 if (newlen > table->maxlen) 2595 newlen = table->maxlen; 2596 2597 if (copy_from_user(table->data, newval, newlen)) 2598 return -EFAULT; 2599 } 2600 return 1; 2601 } 2602 2603 /* The generic string strategy routine: */ 2604 int sysctl_string(struct ctl_table *table, int __user *name, int nlen, 2605 void __user *oldval, size_t __user *oldlenp, 2606 void __user *newval, size_t newlen) 2607 { 2608 if (!table->data || !table->maxlen) 2609 return -ENOTDIR; 2610 2611 if (oldval && oldlenp) { 2612 size_t bufsize; 2613 if (get_user(bufsize, oldlenp)) 2614 return -EFAULT; 2615 if (bufsize) { 2616 size_t len = strlen(table->data), copied; 2617 2618 /* This shouldn't trigger for a well-formed sysctl */ 2619 if (len > table->maxlen) 2620 len = table->maxlen; 2621 2622 /* Copy up to a max of bufsize-1 bytes of the string */ 2623 copied = (len >= bufsize) ? bufsize - 1 : len; 2624 2625 if (copy_to_user(oldval, table->data, copied) || 2626 put_user(0, (char __user *)(oldval + copied))) 2627 return -EFAULT; 2628 if (put_user(len, oldlenp)) 2629 return -EFAULT; 2630 } 2631 } 2632 if (newval && newlen) { 2633 size_t len = newlen; 2634 if (len > table->maxlen) 2635 len = table->maxlen; 2636 if(copy_from_user(table->data, newval, len)) 2637 return -EFAULT; 2638 if (len == table->maxlen) 2639 len--; 2640 ((char *) table->data)[len] = 0; 2641 } 2642 return 1; 2643 } 2644 2645 /* 2646 * This function makes sure that all of the integers in the vector 2647 * are between the minimum and maximum values given in the arrays 2648 * table->extra1 and table->extra2, respectively. 2649 */ 2650 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, 2651 void __user *oldval, size_t __user *oldlenp, 2652 void __user *newval, size_t newlen) 2653 { 2654 2655 if (newval && newlen) { 2656 int __user *vec = (int __user *) newval; 2657 int *min = (int *) table->extra1; 2658 int *max = (int *) table->extra2; 2659 size_t length; 2660 int i; 2661 2662 if (newlen % sizeof(int) != 0) 2663 return -EINVAL; 2664 2665 if (!table->extra1 && !table->extra2) 2666 return 0; 2667 2668 if (newlen > table->maxlen) 2669 newlen = table->maxlen; 2670 length = newlen / sizeof(int); 2671 2672 for (i = 0; i < length; i++) { 2673 int value; 2674 if (get_user(value, vec + i)) 2675 return -EFAULT; 2676 if (min && value < min[i]) 2677 return -EINVAL; 2678 if (max && value > max[i]) 2679 return -EINVAL; 2680 } 2681 } 2682 return 0; 2683 } 2684 2685 /* Strategy function to convert jiffies to seconds */ 2686 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, 2687 void __user *oldval, size_t __user *oldlenp, 2688 void __user *newval, size_t newlen) 2689 { 2690 if (oldval && oldlenp) { 2691 size_t olen; 2692 2693 if (get_user(olen, oldlenp)) 2694 return -EFAULT; 2695 if (olen) { 2696 int val; 2697 2698 if (olen < sizeof(int)) 2699 return -EINVAL; 2700 2701 val = *(int *)(table->data) / HZ; 2702 if (put_user(val, (int __user *)oldval)) 2703 return -EFAULT; 2704 if (put_user(sizeof(int), oldlenp)) 2705 return -EFAULT; 2706 } 2707 } 2708 if (newval && newlen) { 2709 int new; 2710 if (newlen != sizeof(int)) 2711 return -EINVAL; 2712 if (get_user(new, (int __user *)newval)) 2713 return -EFAULT; 2714 *(int *)(table->data) = new*HZ; 2715 } 2716 return 1; 2717 } 2718 2719 /* Strategy function to convert jiffies to seconds */ 2720 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, 2721 void __user *oldval, size_t __user *oldlenp, 2722 void __user *newval, size_t newlen) 2723 { 2724 if (oldval && oldlenp) { 2725 size_t olen; 2726 2727 if (get_user(olen, oldlenp)) 2728 return -EFAULT; 2729 if (olen) { 2730 int val; 2731 2732 if (olen < sizeof(int)) 2733 return -EINVAL; 2734 2735 val = jiffies_to_msecs(*(int *)(table->data)); 2736 if (put_user(val, (int __user *)oldval)) 2737 return -EFAULT; 2738 if (put_user(sizeof(int), oldlenp)) 2739 return -EFAULT; 2740 } 2741 } 2742 if (newval && newlen) { 2743 int new; 2744 if (newlen != sizeof(int)) 2745 return -EINVAL; 2746 if (get_user(new, (int __user *)newval)) 2747 return -EFAULT; 2748 *(int *)(table->data) = msecs_to_jiffies(new); 2749 } 2750 return 1; 2751 } 2752 2753 2754 2755 #else /* CONFIG_SYSCTL_SYSCALL */ 2756 2757 2758 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 2759 { 2760 struct __sysctl_args tmp; 2761 int error; 2762 2763 if (copy_from_user(&tmp, args, sizeof(tmp))) 2764 return -EFAULT; 2765 2766 error = deprecated_sysctl_warning(&tmp); 2767 2768 /* If no error reading the parameters then just -ENOSYS ... */ 2769 if (!error) 2770 error = -ENOSYS; 2771 2772 return error; 2773 } 2774 2775 int sysctl_data(struct ctl_table *table, int __user *name, int nlen, 2776 void __user *oldval, size_t __user *oldlenp, 2777 void __user *newval, size_t newlen) 2778 { 2779 return -ENOSYS; 2780 } 2781 2782 int sysctl_string(struct ctl_table *table, int __user *name, int nlen, 2783 void __user *oldval, size_t __user *oldlenp, 2784 void __user *newval, size_t newlen) 2785 { 2786 return -ENOSYS; 2787 } 2788 2789 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, 2790 void __user *oldval, size_t __user *oldlenp, 2791 void __user *newval, size_t newlen) 2792 { 2793 return -ENOSYS; 2794 } 2795 2796 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, 2797 void __user *oldval, size_t __user *oldlenp, 2798 void __user *newval, size_t newlen) 2799 { 2800 return -ENOSYS; 2801 } 2802 2803 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, 2804 void __user *oldval, size_t __user *oldlenp, 2805 void __user *newval, size_t newlen) 2806 { 2807 return -ENOSYS; 2808 } 2809 2810 #endif /* CONFIG_SYSCTL_SYSCALL */ 2811 2812 static int deprecated_sysctl_warning(struct __sysctl_args *args) 2813 { 2814 static int msg_count; 2815 int name[CTL_MAXNAME]; 2816 int i; 2817 2818 /* Check args->nlen. */ 2819 if (args->nlen < 0 || args->nlen > CTL_MAXNAME) 2820 return -ENOTDIR; 2821 2822 /* Read in the sysctl name for better debug message logging */ 2823 for (i = 0; i < args->nlen; i++) 2824 if (get_user(name[i], args->name + i)) 2825 return -EFAULT; 2826 2827 /* Ignore accesses to kernel.version */ 2828 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) 2829 return 0; 2830 2831 if (msg_count < 5) { 2832 msg_count++; 2833 printk(KERN_INFO 2834 "warning: process `%s' used the deprecated sysctl " 2835 "system call with ", current->comm); 2836 for (i = 0; i < args->nlen; i++) 2837 printk("%d.", name[i]); 2838 printk("\n"); 2839 } 2840 return 0; 2841 } 2842 2843 /* 2844 * No sense putting this after each symbol definition, twice, 2845 * exception granted :-) 2846 */ 2847 EXPORT_SYMBOL(proc_dointvec); 2848 EXPORT_SYMBOL(proc_dointvec_jiffies); 2849 EXPORT_SYMBOL(proc_dointvec_minmax); 2850 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2851 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2852 EXPORT_SYMBOL(proc_dostring); 2853 EXPORT_SYMBOL(proc_doulongvec_minmax); 2854 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2855 EXPORT_SYMBOL(register_sysctl_table); 2856 EXPORT_SYMBOL(register_sysctl_paths); 2857 EXPORT_SYMBOL(sysctl_intvec); 2858 EXPORT_SYMBOL(sysctl_jiffies); 2859 EXPORT_SYMBOL(sysctl_ms_jiffies); 2860 EXPORT_SYMBOL(sysctl_string); 2861 EXPORT_SYMBOL(sysctl_data); 2862 EXPORT_SYMBOL(unregister_sysctl_table); 2863