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/vmstat.h> 47 #include <linux/nfs_fs.h> 48 #include <linux/acpi.h> 49 #include <linux/reboot.h> 50 #include <linux/ftrace.h> 51 #include <linux/slow-work.h> 52 53 #include <asm/uaccess.h> 54 #include <asm/processor.h> 55 56 #ifdef CONFIG_X86 57 #include <asm/nmi.h> 58 #include <asm/stacktrace.h> 59 #include <asm/io.h> 60 #endif 61 62 static int deprecated_sysctl_warning(struct __sysctl_args *args); 63 64 #if defined(CONFIG_SYSCTL) 65 66 /* External variables not in a header file. */ 67 extern int C_A_D; 68 extern int print_fatal_signals; 69 extern int sysctl_overcommit_memory; 70 extern int sysctl_overcommit_ratio; 71 extern int sysctl_panic_on_oom; 72 extern int sysctl_oom_kill_allocating_task; 73 extern int sysctl_oom_dump_tasks; 74 extern int max_threads; 75 extern int core_uses_pid; 76 extern int suid_dumpable; 77 extern char core_pattern[]; 78 extern int pid_max; 79 extern int min_free_kbytes; 80 extern int pid_max_min, pid_max_max; 81 extern int sysctl_drop_caches; 82 extern int percpu_pagelist_fraction; 83 extern int compat_log; 84 extern int latencytop_enabled; 85 extern int sysctl_nr_open_min, sysctl_nr_open_max; 86 #ifndef CONFIG_MMU 87 extern int sysctl_nr_trim_pages; 88 #endif 89 #ifdef CONFIG_RCU_TORTURE_TEST 90 extern int rcutorture_runnable; 91 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ 92 93 /* Constants used for minimum and maximum */ 94 #ifdef CONFIG_DETECT_SOFTLOCKUP 95 static int sixty = 60; 96 static int neg_one = -1; 97 #endif 98 99 static int zero; 100 static int __maybe_unused one = 1; 101 static int __maybe_unused two = 2; 102 static unsigned long one_ul = 1; 103 static int one_hundred = 100; 104 105 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 106 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 107 108 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 109 static int maxolduid = 65535; 110 static int minolduid; 111 static int min_percpu_pagelist_fract = 8; 112 113 static int ngroups_max = NGROUPS_MAX; 114 115 #ifdef CONFIG_MODULES 116 extern char modprobe_path[]; 117 #endif 118 #ifdef CONFIG_CHR_DEV_SG 119 extern int sg_big_buff; 120 #endif 121 122 #ifdef CONFIG_SPARC 123 #include <asm/system.h> 124 #endif 125 126 #ifdef CONFIG_SPARC64 127 extern int sysctl_tsb_ratio; 128 #endif 129 130 #ifdef __hppa__ 131 extern int pwrsw_enabled; 132 extern int unaligned_enabled; 133 #endif 134 135 #ifdef CONFIG_S390 136 #ifdef CONFIG_MATHEMU 137 extern int sysctl_ieee_emulation_warnings; 138 #endif 139 extern int sysctl_userprocess_debug; 140 extern int spin_retry; 141 #endif 142 143 #ifdef CONFIG_BSD_PROCESS_ACCT 144 extern int acct_parm[]; 145 #endif 146 147 #ifdef CONFIG_IA64 148 extern int no_unaligned_warning; 149 extern int unaligned_dump_stack; 150 #endif 151 152 #ifdef CONFIG_RT_MUTEXES 153 extern int max_lock_depth; 154 #endif 155 156 #ifdef CONFIG_PROC_SYSCTL 157 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 158 void __user *buffer, size_t *lenp, loff_t *ppos); 159 static int proc_taint(struct ctl_table *table, int write, struct file *filp, 160 void __user *buffer, size_t *lenp, loff_t *ppos); 161 #endif 162 163 static struct ctl_table root_table[]; 164 static struct ctl_table_root sysctl_table_root; 165 static struct ctl_table_header root_table_header = { 166 .count = 1, 167 .ctl_table = root_table, 168 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 169 .root = &sysctl_table_root, 170 .set = &sysctl_table_root.default_set, 171 }; 172 static struct ctl_table_root sysctl_table_root = { 173 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 174 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 175 }; 176 177 static struct ctl_table kern_table[]; 178 static struct ctl_table vm_table[]; 179 static struct ctl_table fs_table[]; 180 static struct ctl_table debug_table[]; 181 static struct ctl_table dev_table[]; 182 extern struct ctl_table random_table[]; 183 #ifdef CONFIG_INOTIFY_USER 184 extern struct ctl_table inotify_table[]; 185 #endif 186 #ifdef CONFIG_EPOLL 187 extern struct ctl_table epoll_table[]; 188 #endif 189 190 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 191 int sysctl_legacy_va_layout; 192 #endif 193 194 extern int prove_locking; 195 extern int lock_stat; 196 197 /* The default sysctl tables: */ 198 199 static struct ctl_table root_table[] = { 200 { 201 .ctl_name = CTL_KERN, 202 .procname = "kernel", 203 .mode = 0555, 204 .child = kern_table, 205 }, 206 { 207 .ctl_name = CTL_VM, 208 .procname = "vm", 209 .mode = 0555, 210 .child = vm_table, 211 }, 212 { 213 .ctl_name = CTL_FS, 214 .procname = "fs", 215 .mode = 0555, 216 .child = fs_table, 217 }, 218 { 219 .ctl_name = CTL_DEBUG, 220 .procname = "debug", 221 .mode = 0555, 222 .child = debug_table, 223 }, 224 { 225 .ctl_name = CTL_DEV, 226 .procname = "dev", 227 .mode = 0555, 228 .child = dev_table, 229 }, 230 /* 231 * NOTE: do not add new entries to this table unless you have read 232 * Documentation/sysctl/ctl_unnumbered.txt 233 */ 234 { .ctl_name = 0 } 235 }; 236 237 #ifdef CONFIG_SCHED_DEBUG 238 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 239 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 240 static int min_wakeup_granularity_ns; /* 0 usecs */ 241 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 242 #endif 243 244 static struct ctl_table kern_table[] = { 245 #ifdef CONFIG_SCHED_DEBUG 246 { 247 .ctl_name = CTL_UNNUMBERED, 248 .procname = "sched_min_granularity_ns", 249 .data = &sysctl_sched_min_granularity, 250 .maxlen = sizeof(unsigned int), 251 .mode = 0644, 252 .proc_handler = &sched_nr_latency_handler, 253 .strategy = &sysctl_intvec, 254 .extra1 = &min_sched_granularity_ns, 255 .extra2 = &max_sched_granularity_ns, 256 }, 257 { 258 .ctl_name = CTL_UNNUMBERED, 259 .procname = "sched_latency_ns", 260 .data = &sysctl_sched_latency, 261 .maxlen = sizeof(unsigned int), 262 .mode = 0644, 263 .proc_handler = &sched_nr_latency_handler, 264 .strategy = &sysctl_intvec, 265 .extra1 = &min_sched_granularity_ns, 266 .extra2 = &max_sched_granularity_ns, 267 }, 268 { 269 .ctl_name = CTL_UNNUMBERED, 270 .procname = "sched_wakeup_granularity_ns", 271 .data = &sysctl_sched_wakeup_granularity, 272 .maxlen = sizeof(unsigned int), 273 .mode = 0644, 274 .proc_handler = &proc_dointvec_minmax, 275 .strategy = &sysctl_intvec, 276 .extra1 = &min_wakeup_granularity_ns, 277 .extra2 = &max_wakeup_granularity_ns, 278 }, 279 { 280 .ctl_name = CTL_UNNUMBERED, 281 .procname = "sched_shares_ratelimit", 282 .data = &sysctl_sched_shares_ratelimit, 283 .maxlen = sizeof(unsigned int), 284 .mode = 0644, 285 .proc_handler = &proc_dointvec, 286 }, 287 { 288 .ctl_name = CTL_UNNUMBERED, 289 .procname = "sched_shares_thresh", 290 .data = &sysctl_sched_shares_thresh, 291 .maxlen = sizeof(unsigned int), 292 .mode = 0644, 293 .proc_handler = &proc_dointvec_minmax, 294 .strategy = &sysctl_intvec, 295 .extra1 = &zero, 296 }, 297 { 298 .ctl_name = CTL_UNNUMBERED, 299 .procname = "sched_child_runs_first", 300 .data = &sysctl_sched_child_runs_first, 301 .maxlen = sizeof(unsigned int), 302 .mode = 0644, 303 .proc_handler = &proc_dointvec, 304 }, 305 { 306 .ctl_name = CTL_UNNUMBERED, 307 .procname = "sched_features", 308 .data = &sysctl_sched_features, 309 .maxlen = sizeof(unsigned int), 310 .mode = 0644, 311 .proc_handler = &proc_dointvec, 312 }, 313 { 314 .ctl_name = CTL_UNNUMBERED, 315 .procname = "sched_migration_cost", 316 .data = &sysctl_sched_migration_cost, 317 .maxlen = sizeof(unsigned int), 318 .mode = 0644, 319 .proc_handler = &proc_dointvec, 320 }, 321 { 322 .ctl_name = CTL_UNNUMBERED, 323 .procname = "sched_nr_migrate", 324 .data = &sysctl_sched_nr_migrate, 325 .maxlen = sizeof(unsigned int), 326 .mode = 0644, 327 .proc_handler = &proc_dointvec, 328 }, 329 #endif 330 { 331 .ctl_name = CTL_UNNUMBERED, 332 .procname = "sched_rt_period_us", 333 .data = &sysctl_sched_rt_period, 334 .maxlen = sizeof(unsigned int), 335 .mode = 0644, 336 .proc_handler = &sched_rt_handler, 337 }, 338 { 339 .ctl_name = CTL_UNNUMBERED, 340 .procname = "sched_rt_runtime_us", 341 .data = &sysctl_sched_rt_runtime, 342 .maxlen = sizeof(int), 343 .mode = 0644, 344 .proc_handler = &sched_rt_handler, 345 }, 346 { 347 .ctl_name = CTL_UNNUMBERED, 348 .procname = "sched_compat_yield", 349 .data = &sysctl_sched_compat_yield, 350 .maxlen = sizeof(unsigned int), 351 .mode = 0644, 352 .proc_handler = &proc_dointvec, 353 }, 354 #ifdef CONFIG_PROVE_LOCKING 355 { 356 .ctl_name = CTL_UNNUMBERED, 357 .procname = "prove_locking", 358 .data = &prove_locking, 359 .maxlen = sizeof(int), 360 .mode = 0644, 361 .proc_handler = &proc_dointvec, 362 }, 363 #endif 364 #ifdef CONFIG_LOCK_STAT 365 { 366 .ctl_name = CTL_UNNUMBERED, 367 .procname = "lock_stat", 368 .data = &lock_stat, 369 .maxlen = sizeof(int), 370 .mode = 0644, 371 .proc_handler = &proc_dointvec, 372 }, 373 #endif 374 { 375 .ctl_name = KERN_PANIC, 376 .procname = "panic", 377 .data = &panic_timeout, 378 .maxlen = sizeof(int), 379 .mode = 0644, 380 .proc_handler = &proc_dointvec, 381 }, 382 { 383 .ctl_name = KERN_CORE_USES_PID, 384 .procname = "core_uses_pid", 385 .data = &core_uses_pid, 386 .maxlen = sizeof(int), 387 .mode = 0644, 388 .proc_handler = &proc_dointvec, 389 }, 390 { 391 .ctl_name = KERN_CORE_PATTERN, 392 .procname = "core_pattern", 393 .data = core_pattern, 394 .maxlen = CORENAME_MAX_SIZE, 395 .mode = 0644, 396 .proc_handler = &proc_dostring, 397 .strategy = &sysctl_string, 398 }, 399 #ifdef CONFIG_PROC_SYSCTL 400 { 401 .procname = "tainted", 402 .maxlen = sizeof(long), 403 .mode = 0644, 404 .proc_handler = &proc_taint, 405 }, 406 #endif 407 #ifdef CONFIG_LATENCYTOP 408 { 409 .procname = "latencytop", 410 .data = &latencytop_enabled, 411 .maxlen = sizeof(int), 412 .mode = 0644, 413 .proc_handler = &proc_dointvec, 414 }, 415 #endif 416 #ifdef CONFIG_BLK_DEV_INITRD 417 { 418 .ctl_name = KERN_REALROOTDEV, 419 .procname = "real-root-dev", 420 .data = &real_root_dev, 421 .maxlen = sizeof(int), 422 .mode = 0644, 423 .proc_handler = &proc_dointvec, 424 }, 425 #endif 426 { 427 .ctl_name = CTL_UNNUMBERED, 428 .procname = "print-fatal-signals", 429 .data = &print_fatal_signals, 430 .maxlen = sizeof(int), 431 .mode = 0644, 432 .proc_handler = &proc_dointvec, 433 }, 434 #ifdef CONFIG_SPARC 435 { 436 .ctl_name = KERN_SPARC_REBOOT, 437 .procname = "reboot-cmd", 438 .data = reboot_command, 439 .maxlen = 256, 440 .mode = 0644, 441 .proc_handler = &proc_dostring, 442 .strategy = &sysctl_string, 443 }, 444 { 445 .ctl_name = KERN_SPARC_STOP_A, 446 .procname = "stop-a", 447 .data = &stop_a_enabled, 448 .maxlen = sizeof (int), 449 .mode = 0644, 450 .proc_handler = &proc_dointvec, 451 }, 452 { 453 .ctl_name = KERN_SPARC_SCONS_PWROFF, 454 .procname = "scons-poweroff", 455 .data = &scons_pwroff, 456 .maxlen = sizeof (int), 457 .mode = 0644, 458 .proc_handler = &proc_dointvec, 459 }, 460 #endif 461 #ifdef CONFIG_SPARC64 462 { 463 .ctl_name = CTL_UNNUMBERED, 464 .procname = "tsb-ratio", 465 .data = &sysctl_tsb_ratio, 466 .maxlen = sizeof (int), 467 .mode = 0644, 468 .proc_handler = &proc_dointvec, 469 }, 470 #endif 471 #ifdef __hppa__ 472 { 473 .ctl_name = KERN_HPPA_PWRSW, 474 .procname = "soft-power", 475 .data = &pwrsw_enabled, 476 .maxlen = sizeof (int), 477 .mode = 0644, 478 .proc_handler = &proc_dointvec, 479 }, 480 { 481 .ctl_name = KERN_HPPA_UNALIGNED, 482 .procname = "unaligned-trap", 483 .data = &unaligned_enabled, 484 .maxlen = sizeof (int), 485 .mode = 0644, 486 .proc_handler = &proc_dointvec, 487 }, 488 #endif 489 { 490 .ctl_name = KERN_CTLALTDEL, 491 .procname = "ctrl-alt-del", 492 .data = &C_A_D, 493 .maxlen = sizeof(int), 494 .mode = 0644, 495 .proc_handler = &proc_dointvec, 496 }, 497 #ifdef CONFIG_FUNCTION_TRACER 498 { 499 .ctl_name = CTL_UNNUMBERED, 500 .procname = "ftrace_enabled", 501 .data = &ftrace_enabled, 502 .maxlen = sizeof(int), 503 .mode = 0644, 504 .proc_handler = &ftrace_enable_sysctl, 505 }, 506 #endif 507 #ifdef CONFIG_STACK_TRACER 508 { 509 .ctl_name = CTL_UNNUMBERED, 510 .procname = "stack_tracer_enabled", 511 .data = &stack_tracer_enabled, 512 .maxlen = sizeof(int), 513 .mode = 0644, 514 .proc_handler = &stack_trace_sysctl, 515 }, 516 #endif 517 #ifdef CONFIG_TRACING 518 { 519 .ctl_name = CTL_UNNUMBERED, 520 .procname = "ftrace_dump_on_oops", 521 .data = &ftrace_dump_on_oops, 522 .maxlen = sizeof(int), 523 .mode = 0644, 524 .proc_handler = &proc_dointvec, 525 }, 526 #endif 527 #ifdef CONFIG_MODULES 528 { 529 .ctl_name = KERN_MODPROBE, 530 .procname = "modprobe", 531 .data = &modprobe_path, 532 .maxlen = KMOD_PATH_LEN, 533 .mode = 0644, 534 .proc_handler = &proc_dostring, 535 .strategy = &sysctl_string, 536 }, 537 #endif 538 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) 539 { 540 .ctl_name = KERN_HOTPLUG, 541 .procname = "hotplug", 542 .data = &uevent_helper, 543 .maxlen = UEVENT_HELPER_PATH_LEN, 544 .mode = 0644, 545 .proc_handler = &proc_dostring, 546 .strategy = &sysctl_string, 547 }, 548 #endif 549 #ifdef CONFIG_CHR_DEV_SG 550 { 551 .ctl_name = KERN_SG_BIG_BUFF, 552 .procname = "sg-big-buff", 553 .data = &sg_big_buff, 554 .maxlen = sizeof (int), 555 .mode = 0444, 556 .proc_handler = &proc_dointvec, 557 }, 558 #endif 559 #ifdef CONFIG_BSD_PROCESS_ACCT 560 { 561 .ctl_name = KERN_ACCT, 562 .procname = "acct", 563 .data = &acct_parm, 564 .maxlen = 3*sizeof(int), 565 .mode = 0644, 566 .proc_handler = &proc_dointvec, 567 }, 568 #endif 569 #ifdef CONFIG_MAGIC_SYSRQ 570 { 571 .ctl_name = KERN_SYSRQ, 572 .procname = "sysrq", 573 .data = &__sysrq_enabled, 574 .maxlen = sizeof (int), 575 .mode = 0644, 576 .proc_handler = &proc_dointvec, 577 }, 578 #endif 579 #ifdef CONFIG_PROC_SYSCTL 580 { 581 .procname = "cad_pid", 582 .data = NULL, 583 .maxlen = sizeof (int), 584 .mode = 0600, 585 .proc_handler = &proc_do_cad_pid, 586 }, 587 #endif 588 { 589 .ctl_name = KERN_MAX_THREADS, 590 .procname = "threads-max", 591 .data = &max_threads, 592 .maxlen = sizeof(int), 593 .mode = 0644, 594 .proc_handler = &proc_dointvec, 595 }, 596 { 597 .ctl_name = KERN_RANDOM, 598 .procname = "random", 599 .mode = 0555, 600 .child = random_table, 601 }, 602 { 603 .ctl_name = KERN_OVERFLOWUID, 604 .procname = "overflowuid", 605 .data = &overflowuid, 606 .maxlen = sizeof(int), 607 .mode = 0644, 608 .proc_handler = &proc_dointvec_minmax, 609 .strategy = &sysctl_intvec, 610 .extra1 = &minolduid, 611 .extra2 = &maxolduid, 612 }, 613 { 614 .ctl_name = KERN_OVERFLOWGID, 615 .procname = "overflowgid", 616 .data = &overflowgid, 617 .maxlen = sizeof(int), 618 .mode = 0644, 619 .proc_handler = &proc_dointvec_minmax, 620 .strategy = &sysctl_intvec, 621 .extra1 = &minolduid, 622 .extra2 = &maxolduid, 623 }, 624 #ifdef CONFIG_S390 625 #ifdef CONFIG_MATHEMU 626 { 627 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 628 .procname = "ieee_emulation_warnings", 629 .data = &sysctl_ieee_emulation_warnings, 630 .maxlen = sizeof(int), 631 .mode = 0644, 632 .proc_handler = &proc_dointvec, 633 }, 634 #endif 635 { 636 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 637 .procname = "userprocess_debug", 638 .data = &sysctl_userprocess_debug, 639 .maxlen = sizeof(int), 640 .mode = 0644, 641 .proc_handler = &proc_dointvec, 642 }, 643 #endif 644 { 645 .ctl_name = KERN_PIDMAX, 646 .procname = "pid_max", 647 .data = &pid_max, 648 .maxlen = sizeof (int), 649 .mode = 0644, 650 .proc_handler = &proc_dointvec_minmax, 651 .strategy = sysctl_intvec, 652 .extra1 = &pid_max_min, 653 .extra2 = &pid_max_max, 654 }, 655 { 656 .ctl_name = KERN_PANIC_ON_OOPS, 657 .procname = "panic_on_oops", 658 .data = &panic_on_oops, 659 .maxlen = sizeof(int), 660 .mode = 0644, 661 .proc_handler = &proc_dointvec, 662 }, 663 #if defined CONFIG_PRINTK 664 { 665 .ctl_name = KERN_PRINTK, 666 .procname = "printk", 667 .data = &console_loglevel, 668 .maxlen = 4*sizeof(int), 669 .mode = 0644, 670 .proc_handler = &proc_dointvec, 671 }, 672 { 673 .ctl_name = KERN_PRINTK_RATELIMIT, 674 .procname = "printk_ratelimit", 675 .data = &printk_ratelimit_state.interval, 676 .maxlen = sizeof(int), 677 .mode = 0644, 678 .proc_handler = &proc_dointvec_jiffies, 679 .strategy = &sysctl_jiffies, 680 }, 681 { 682 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 683 .procname = "printk_ratelimit_burst", 684 .data = &printk_ratelimit_state.burst, 685 .maxlen = sizeof(int), 686 .mode = 0644, 687 .proc_handler = &proc_dointvec, 688 }, 689 #endif 690 { 691 .ctl_name = KERN_NGROUPS_MAX, 692 .procname = "ngroups_max", 693 .data = &ngroups_max, 694 .maxlen = sizeof (int), 695 .mode = 0444, 696 .proc_handler = &proc_dointvec, 697 }, 698 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 699 { 700 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 701 .procname = "unknown_nmi_panic", 702 .data = &unknown_nmi_panic, 703 .maxlen = sizeof (int), 704 .mode = 0644, 705 .proc_handler = &proc_dointvec, 706 }, 707 { 708 .procname = "nmi_watchdog", 709 .data = &nmi_watchdog_enabled, 710 .maxlen = sizeof (int), 711 .mode = 0644, 712 .proc_handler = &proc_nmi_enabled, 713 }, 714 #endif 715 #if defined(CONFIG_X86) 716 { 717 .ctl_name = KERN_PANIC_ON_NMI, 718 .procname = "panic_on_unrecovered_nmi", 719 .data = &panic_on_unrecovered_nmi, 720 .maxlen = sizeof(int), 721 .mode = 0644, 722 .proc_handler = &proc_dointvec, 723 }, 724 { 725 .ctl_name = KERN_BOOTLOADER_TYPE, 726 .procname = "bootloader_type", 727 .data = &bootloader_type, 728 .maxlen = sizeof (int), 729 .mode = 0444, 730 .proc_handler = &proc_dointvec, 731 }, 732 { 733 .ctl_name = CTL_UNNUMBERED, 734 .procname = "kstack_depth_to_print", 735 .data = &kstack_depth_to_print, 736 .maxlen = sizeof(int), 737 .mode = 0644, 738 .proc_handler = &proc_dointvec, 739 }, 740 { 741 .ctl_name = CTL_UNNUMBERED, 742 .procname = "io_delay_type", 743 .data = &io_delay_type, 744 .maxlen = sizeof(int), 745 .mode = 0644, 746 .proc_handler = &proc_dointvec, 747 }, 748 #endif 749 #if defined(CONFIG_MMU) 750 { 751 .ctl_name = KERN_RANDOMIZE, 752 .procname = "randomize_va_space", 753 .data = &randomize_va_space, 754 .maxlen = sizeof(int), 755 .mode = 0644, 756 .proc_handler = &proc_dointvec, 757 }, 758 #endif 759 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 760 { 761 .ctl_name = KERN_SPIN_RETRY, 762 .procname = "spin_retry", 763 .data = &spin_retry, 764 .maxlen = sizeof (int), 765 .mode = 0644, 766 .proc_handler = &proc_dointvec, 767 }, 768 #endif 769 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 770 { 771 .procname = "acpi_video_flags", 772 .data = &acpi_realmode_flags, 773 .maxlen = sizeof (unsigned long), 774 .mode = 0644, 775 .proc_handler = &proc_doulongvec_minmax, 776 }, 777 #endif 778 #ifdef CONFIG_IA64 779 { 780 .ctl_name = KERN_IA64_UNALIGNED, 781 .procname = "ignore-unaligned-usertrap", 782 .data = &no_unaligned_warning, 783 .maxlen = sizeof (int), 784 .mode = 0644, 785 .proc_handler = &proc_dointvec, 786 }, 787 { 788 .ctl_name = CTL_UNNUMBERED, 789 .procname = "unaligned-dump-stack", 790 .data = &unaligned_dump_stack, 791 .maxlen = sizeof (int), 792 .mode = 0644, 793 .proc_handler = &proc_dointvec, 794 }, 795 #endif 796 #ifdef CONFIG_DETECT_SOFTLOCKUP 797 { 798 .ctl_name = CTL_UNNUMBERED, 799 .procname = "softlockup_panic", 800 .data = &softlockup_panic, 801 .maxlen = sizeof(int), 802 .mode = 0644, 803 .proc_handler = &proc_dointvec_minmax, 804 .strategy = &sysctl_intvec, 805 .extra1 = &zero, 806 .extra2 = &one, 807 }, 808 { 809 .ctl_name = CTL_UNNUMBERED, 810 .procname = "softlockup_thresh", 811 .data = &softlockup_thresh, 812 .maxlen = sizeof(int), 813 .mode = 0644, 814 .proc_handler = &proc_dosoftlockup_thresh, 815 .strategy = &sysctl_intvec, 816 .extra1 = &neg_one, 817 .extra2 = &sixty, 818 }, 819 #endif 820 #ifdef CONFIG_DETECT_HUNG_TASK 821 { 822 .ctl_name = CTL_UNNUMBERED, 823 .procname = "hung_task_panic", 824 .data = &sysctl_hung_task_panic, 825 .maxlen = sizeof(int), 826 .mode = 0644, 827 .proc_handler = &proc_dointvec_minmax, 828 .strategy = &sysctl_intvec, 829 .extra1 = &zero, 830 .extra2 = &one, 831 }, 832 { 833 .ctl_name = CTL_UNNUMBERED, 834 .procname = "hung_task_check_count", 835 .data = &sysctl_hung_task_check_count, 836 .maxlen = sizeof(unsigned long), 837 .mode = 0644, 838 .proc_handler = &proc_doulongvec_minmax, 839 .strategy = &sysctl_intvec, 840 }, 841 { 842 .ctl_name = CTL_UNNUMBERED, 843 .procname = "hung_task_timeout_secs", 844 .data = &sysctl_hung_task_timeout_secs, 845 .maxlen = sizeof(unsigned long), 846 .mode = 0644, 847 .proc_handler = &proc_dohung_task_timeout_secs, 848 .strategy = &sysctl_intvec, 849 }, 850 { 851 .ctl_name = CTL_UNNUMBERED, 852 .procname = "hung_task_warnings", 853 .data = &sysctl_hung_task_warnings, 854 .maxlen = sizeof(unsigned long), 855 .mode = 0644, 856 .proc_handler = &proc_doulongvec_minmax, 857 .strategy = &sysctl_intvec, 858 }, 859 #endif 860 #ifdef CONFIG_COMPAT 861 { 862 .ctl_name = KERN_COMPAT_LOG, 863 .procname = "compat-log", 864 .data = &compat_log, 865 .maxlen = sizeof (int), 866 .mode = 0644, 867 .proc_handler = &proc_dointvec, 868 }, 869 #endif 870 #ifdef CONFIG_RT_MUTEXES 871 { 872 .ctl_name = KERN_MAX_LOCK_DEPTH, 873 .procname = "max_lock_depth", 874 .data = &max_lock_depth, 875 .maxlen = sizeof(int), 876 .mode = 0644, 877 .proc_handler = &proc_dointvec, 878 }, 879 #endif 880 { 881 .ctl_name = CTL_UNNUMBERED, 882 .procname = "poweroff_cmd", 883 .data = &poweroff_cmd, 884 .maxlen = POWEROFF_CMD_PATH_LEN, 885 .mode = 0644, 886 .proc_handler = &proc_dostring, 887 .strategy = &sysctl_string, 888 }, 889 #ifdef CONFIG_KEYS 890 { 891 .ctl_name = CTL_UNNUMBERED, 892 .procname = "keys", 893 .mode = 0555, 894 .child = key_sysctls, 895 }, 896 #endif 897 #ifdef CONFIG_RCU_TORTURE_TEST 898 { 899 .ctl_name = CTL_UNNUMBERED, 900 .procname = "rcutorture_runnable", 901 .data = &rcutorture_runnable, 902 .maxlen = sizeof(int), 903 .mode = 0644, 904 .proc_handler = &proc_dointvec, 905 }, 906 #endif 907 #ifdef CONFIG_SLOW_WORK 908 { 909 .ctl_name = CTL_UNNUMBERED, 910 .procname = "slow-work", 911 .mode = 0555, 912 .child = slow_work_sysctls, 913 }, 914 #endif 915 /* 916 * NOTE: do not add new entries to this table unless you have read 917 * Documentation/sysctl/ctl_unnumbered.txt 918 */ 919 { .ctl_name = 0 } 920 }; 921 922 static struct ctl_table vm_table[] = { 923 { 924 .ctl_name = VM_OVERCOMMIT_MEMORY, 925 .procname = "overcommit_memory", 926 .data = &sysctl_overcommit_memory, 927 .maxlen = sizeof(sysctl_overcommit_memory), 928 .mode = 0644, 929 .proc_handler = &proc_dointvec, 930 }, 931 { 932 .ctl_name = VM_PANIC_ON_OOM, 933 .procname = "panic_on_oom", 934 .data = &sysctl_panic_on_oom, 935 .maxlen = sizeof(sysctl_panic_on_oom), 936 .mode = 0644, 937 .proc_handler = &proc_dointvec, 938 }, 939 { 940 .ctl_name = CTL_UNNUMBERED, 941 .procname = "oom_kill_allocating_task", 942 .data = &sysctl_oom_kill_allocating_task, 943 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 944 .mode = 0644, 945 .proc_handler = &proc_dointvec, 946 }, 947 { 948 .ctl_name = CTL_UNNUMBERED, 949 .procname = "oom_dump_tasks", 950 .data = &sysctl_oom_dump_tasks, 951 .maxlen = sizeof(sysctl_oom_dump_tasks), 952 .mode = 0644, 953 .proc_handler = &proc_dointvec, 954 }, 955 { 956 .ctl_name = VM_OVERCOMMIT_RATIO, 957 .procname = "overcommit_ratio", 958 .data = &sysctl_overcommit_ratio, 959 .maxlen = sizeof(sysctl_overcommit_ratio), 960 .mode = 0644, 961 .proc_handler = &proc_dointvec, 962 }, 963 { 964 .ctl_name = VM_PAGE_CLUSTER, 965 .procname = "page-cluster", 966 .data = &page_cluster, 967 .maxlen = sizeof(int), 968 .mode = 0644, 969 .proc_handler = &proc_dointvec, 970 }, 971 { 972 .ctl_name = VM_DIRTY_BACKGROUND, 973 .procname = "dirty_background_ratio", 974 .data = &dirty_background_ratio, 975 .maxlen = sizeof(dirty_background_ratio), 976 .mode = 0644, 977 .proc_handler = &dirty_background_ratio_handler, 978 .strategy = &sysctl_intvec, 979 .extra1 = &zero, 980 .extra2 = &one_hundred, 981 }, 982 { 983 .ctl_name = CTL_UNNUMBERED, 984 .procname = "dirty_background_bytes", 985 .data = &dirty_background_bytes, 986 .maxlen = sizeof(dirty_background_bytes), 987 .mode = 0644, 988 .proc_handler = &dirty_background_bytes_handler, 989 .strategy = &sysctl_intvec, 990 .extra1 = &one_ul, 991 }, 992 { 993 .ctl_name = VM_DIRTY_RATIO, 994 .procname = "dirty_ratio", 995 .data = &vm_dirty_ratio, 996 .maxlen = sizeof(vm_dirty_ratio), 997 .mode = 0644, 998 .proc_handler = &dirty_ratio_handler, 999 .strategy = &sysctl_intvec, 1000 .extra1 = &zero, 1001 .extra2 = &one_hundred, 1002 }, 1003 { 1004 .ctl_name = CTL_UNNUMBERED, 1005 .procname = "dirty_bytes", 1006 .data = &vm_dirty_bytes, 1007 .maxlen = sizeof(vm_dirty_bytes), 1008 .mode = 0644, 1009 .proc_handler = &dirty_bytes_handler, 1010 .strategy = &sysctl_intvec, 1011 .extra1 = &dirty_bytes_min, 1012 }, 1013 { 1014 .procname = "dirty_writeback_centisecs", 1015 .data = &dirty_writeback_interval, 1016 .maxlen = sizeof(dirty_writeback_interval), 1017 .mode = 0644, 1018 .proc_handler = &dirty_writeback_centisecs_handler, 1019 }, 1020 { 1021 .procname = "dirty_expire_centisecs", 1022 .data = &dirty_expire_interval, 1023 .maxlen = sizeof(dirty_expire_interval), 1024 .mode = 0644, 1025 .proc_handler = &proc_dointvec, 1026 }, 1027 { 1028 .ctl_name = VM_NR_PDFLUSH_THREADS, 1029 .procname = "nr_pdflush_threads", 1030 .data = &nr_pdflush_threads, 1031 .maxlen = sizeof nr_pdflush_threads, 1032 .mode = 0444 /* read-only*/, 1033 .proc_handler = &proc_dointvec, 1034 }, 1035 { 1036 .ctl_name = VM_SWAPPINESS, 1037 .procname = "swappiness", 1038 .data = &vm_swappiness, 1039 .maxlen = sizeof(vm_swappiness), 1040 .mode = 0644, 1041 .proc_handler = &proc_dointvec_minmax, 1042 .strategy = &sysctl_intvec, 1043 .extra1 = &zero, 1044 .extra2 = &one_hundred, 1045 }, 1046 #ifdef CONFIG_HUGETLB_PAGE 1047 { 1048 .procname = "nr_hugepages", 1049 .data = NULL, 1050 .maxlen = sizeof(unsigned long), 1051 .mode = 0644, 1052 .proc_handler = &hugetlb_sysctl_handler, 1053 .extra1 = (void *)&hugetlb_zero, 1054 .extra2 = (void *)&hugetlb_infinity, 1055 }, 1056 { 1057 .ctl_name = VM_HUGETLB_GROUP, 1058 .procname = "hugetlb_shm_group", 1059 .data = &sysctl_hugetlb_shm_group, 1060 .maxlen = sizeof(gid_t), 1061 .mode = 0644, 1062 .proc_handler = &proc_dointvec, 1063 }, 1064 { 1065 .ctl_name = CTL_UNNUMBERED, 1066 .procname = "hugepages_treat_as_movable", 1067 .data = &hugepages_treat_as_movable, 1068 .maxlen = sizeof(int), 1069 .mode = 0644, 1070 .proc_handler = &hugetlb_treat_movable_handler, 1071 }, 1072 { 1073 .ctl_name = CTL_UNNUMBERED, 1074 .procname = "nr_overcommit_hugepages", 1075 .data = NULL, 1076 .maxlen = sizeof(unsigned long), 1077 .mode = 0644, 1078 .proc_handler = &hugetlb_overcommit_handler, 1079 .extra1 = (void *)&hugetlb_zero, 1080 .extra2 = (void *)&hugetlb_infinity, 1081 }, 1082 #endif 1083 { 1084 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 1085 .procname = "lowmem_reserve_ratio", 1086 .data = &sysctl_lowmem_reserve_ratio, 1087 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1088 .mode = 0644, 1089 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 1090 .strategy = &sysctl_intvec, 1091 }, 1092 { 1093 .ctl_name = VM_DROP_PAGECACHE, 1094 .procname = "drop_caches", 1095 .data = &sysctl_drop_caches, 1096 .maxlen = sizeof(int), 1097 .mode = 0644, 1098 .proc_handler = drop_caches_sysctl_handler, 1099 .strategy = &sysctl_intvec, 1100 }, 1101 { 1102 .ctl_name = VM_MIN_FREE_KBYTES, 1103 .procname = "min_free_kbytes", 1104 .data = &min_free_kbytes, 1105 .maxlen = sizeof(min_free_kbytes), 1106 .mode = 0644, 1107 .proc_handler = &min_free_kbytes_sysctl_handler, 1108 .strategy = &sysctl_intvec, 1109 .extra1 = &zero, 1110 }, 1111 { 1112 .ctl_name = VM_PERCPU_PAGELIST_FRACTION, 1113 .procname = "percpu_pagelist_fraction", 1114 .data = &percpu_pagelist_fraction, 1115 .maxlen = sizeof(percpu_pagelist_fraction), 1116 .mode = 0644, 1117 .proc_handler = &percpu_pagelist_fraction_sysctl_handler, 1118 .strategy = &sysctl_intvec, 1119 .extra1 = &min_percpu_pagelist_fract, 1120 }, 1121 #ifdef CONFIG_MMU 1122 { 1123 .ctl_name = VM_MAX_MAP_COUNT, 1124 .procname = "max_map_count", 1125 .data = &sysctl_max_map_count, 1126 .maxlen = sizeof(sysctl_max_map_count), 1127 .mode = 0644, 1128 .proc_handler = &proc_dointvec 1129 }, 1130 #else 1131 { 1132 .ctl_name = CTL_UNNUMBERED, 1133 .procname = "nr_trim_pages", 1134 .data = &sysctl_nr_trim_pages, 1135 .maxlen = sizeof(sysctl_nr_trim_pages), 1136 .mode = 0644, 1137 .proc_handler = &proc_dointvec_minmax, 1138 .strategy = &sysctl_intvec, 1139 .extra1 = &zero, 1140 }, 1141 #endif 1142 { 1143 .ctl_name = VM_LAPTOP_MODE, 1144 .procname = "laptop_mode", 1145 .data = &laptop_mode, 1146 .maxlen = sizeof(laptop_mode), 1147 .mode = 0644, 1148 .proc_handler = &proc_dointvec_jiffies, 1149 .strategy = &sysctl_jiffies, 1150 }, 1151 { 1152 .ctl_name = VM_BLOCK_DUMP, 1153 .procname = "block_dump", 1154 .data = &block_dump, 1155 .maxlen = sizeof(block_dump), 1156 .mode = 0644, 1157 .proc_handler = &proc_dointvec, 1158 .strategy = &sysctl_intvec, 1159 .extra1 = &zero, 1160 }, 1161 { 1162 .ctl_name = VM_VFS_CACHE_PRESSURE, 1163 .procname = "vfs_cache_pressure", 1164 .data = &sysctl_vfs_cache_pressure, 1165 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1166 .mode = 0644, 1167 .proc_handler = &proc_dointvec, 1168 .strategy = &sysctl_intvec, 1169 .extra1 = &zero, 1170 }, 1171 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1172 { 1173 .ctl_name = VM_LEGACY_VA_LAYOUT, 1174 .procname = "legacy_va_layout", 1175 .data = &sysctl_legacy_va_layout, 1176 .maxlen = sizeof(sysctl_legacy_va_layout), 1177 .mode = 0644, 1178 .proc_handler = &proc_dointvec, 1179 .strategy = &sysctl_intvec, 1180 .extra1 = &zero, 1181 }, 1182 #endif 1183 #ifdef CONFIG_NUMA 1184 { 1185 .ctl_name = VM_ZONE_RECLAIM_MODE, 1186 .procname = "zone_reclaim_mode", 1187 .data = &zone_reclaim_mode, 1188 .maxlen = sizeof(zone_reclaim_mode), 1189 .mode = 0644, 1190 .proc_handler = &proc_dointvec, 1191 .strategy = &sysctl_intvec, 1192 .extra1 = &zero, 1193 }, 1194 { 1195 .ctl_name = VM_MIN_UNMAPPED, 1196 .procname = "min_unmapped_ratio", 1197 .data = &sysctl_min_unmapped_ratio, 1198 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1199 .mode = 0644, 1200 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, 1201 .strategy = &sysctl_intvec, 1202 .extra1 = &zero, 1203 .extra2 = &one_hundred, 1204 }, 1205 { 1206 .ctl_name = VM_MIN_SLAB, 1207 .procname = "min_slab_ratio", 1208 .data = &sysctl_min_slab_ratio, 1209 .maxlen = sizeof(sysctl_min_slab_ratio), 1210 .mode = 0644, 1211 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, 1212 .strategy = &sysctl_intvec, 1213 .extra1 = &zero, 1214 .extra2 = &one_hundred, 1215 }, 1216 #endif 1217 #ifdef CONFIG_SMP 1218 { 1219 .ctl_name = CTL_UNNUMBERED, 1220 .procname = "stat_interval", 1221 .data = &sysctl_stat_interval, 1222 .maxlen = sizeof(sysctl_stat_interval), 1223 .mode = 0644, 1224 .proc_handler = &proc_dointvec_jiffies, 1225 .strategy = &sysctl_jiffies, 1226 }, 1227 #endif 1228 #ifdef CONFIG_SECURITY 1229 { 1230 .ctl_name = CTL_UNNUMBERED, 1231 .procname = "mmap_min_addr", 1232 .data = &mmap_min_addr, 1233 .maxlen = sizeof(unsigned long), 1234 .mode = 0644, 1235 .proc_handler = &proc_doulongvec_minmax, 1236 }, 1237 #endif 1238 #ifdef CONFIG_NUMA 1239 { 1240 .ctl_name = CTL_UNNUMBERED, 1241 .procname = "numa_zonelist_order", 1242 .data = &numa_zonelist_order, 1243 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1244 .mode = 0644, 1245 .proc_handler = &numa_zonelist_order_handler, 1246 .strategy = &sysctl_string, 1247 }, 1248 #endif 1249 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1250 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1251 { 1252 .ctl_name = VM_VDSO_ENABLED, 1253 .procname = "vdso_enabled", 1254 .data = &vdso_enabled, 1255 .maxlen = sizeof(vdso_enabled), 1256 .mode = 0644, 1257 .proc_handler = &proc_dointvec, 1258 .strategy = &sysctl_intvec, 1259 .extra1 = &zero, 1260 }, 1261 #endif 1262 #ifdef CONFIG_HIGHMEM 1263 { 1264 .ctl_name = CTL_UNNUMBERED, 1265 .procname = "highmem_is_dirtyable", 1266 .data = &vm_highmem_is_dirtyable, 1267 .maxlen = sizeof(vm_highmem_is_dirtyable), 1268 .mode = 0644, 1269 .proc_handler = &proc_dointvec_minmax, 1270 .strategy = &sysctl_intvec, 1271 .extra1 = &zero, 1272 .extra2 = &one, 1273 }, 1274 #endif 1275 #ifdef CONFIG_UNEVICTABLE_LRU 1276 { 1277 .ctl_name = CTL_UNNUMBERED, 1278 .procname = "scan_unevictable_pages", 1279 .data = &scan_unevictable_pages, 1280 .maxlen = sizeof(scan_unevictable_pages), 1281 .mode = 0644, 1282 .proc_handler = &scan_unevictable_handler, 1283 }, 1284 #endif 1285 /* 1286 * NOTE: do not add new entries to this table unless you have read 1287 * Documentation/sysctl/ctl_unnumbered.txt 1288 */ 1289 { .ctl_name = 0 } 1290 }; 1291 1292 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1293 static struct ctl_table binfmt_misc_table[] = { 1294 { .ctl_name = 0 } 1295 }; 1296 #endif 1297 1298 static struct ctl_table fs_table[] = { 1299 { 1300 .ctl_name = FS_NRINODE, 1301 .procname = "inode-nr", 1302 .data = &inodes_stat, 1303 .maxlen = 2*sizeof(int), 1304 .mode = 0444, 1305 .proc_handler = &proc_dointvec, 1306 }, 1307 { 1308 .ctl_name = FS_STATINODE, 1309 .procname = "inode-state", 1310 .data = &inodes_stat, 1311 .maxlen = 7*sizeof(int), 1312 .mode = 0444, 1313 .proc_handler = &proc_dointvec, 1314 }, 1315 { 1316 .procname = "file-nr", 1317 .data = &files_stat, 1318 .maxlen = 3*sizeof(int), 1319 .mode = 0444, 1320 .proc_handler = &proc_nr_files, 1321 }, 1322 { 1323 .ctl_name = FS_MAXFILE, 1324 .procname = "file-max", 1325 .data = &files_stat.max_files, 1326 .maxlen = sizeof(int), 1327 .mode = 0644, 1328 .proc_handler = &proc_dointvec, 1329 }, 1330 { 1331 .ctl_name = CTL_UNNUMBERED, 1332 .procname = "nr_open", 1333 .data = &sysctl_nr_open, 1334 .maxlen = sizeof(int), 1335 .mode = 0644, 1336 .proc_handler = &proc_dointvec_minmax, 1337 .extra1 = &sysctl_nr_open_min, 1338 .extra2 = &sysctl_nr_open_max, 1339 }, 1340 { 1341 .ctl_name = FS_DENTRY, 1342 .procname = "dentry-state", 1343 .data = &dentry_stat, 1344 .maxlen = 6*sizeof(int), 1345 .mode = 0444, 1346 .proc_handler = &proc_dointvec, 1347 }, 1348 { 1349 .ctl_name = FS_OVERFLOWUID, 1350 .procname = "overflowuid", 1351 .data = &fs_overflowuid, 1352 .maxlen = sizeof(int), 1353 .mode = 0644, 1354 .proc_handler = &proc_dointvec_minmax, 1355 .strategy = &sysctl_intvec, 1356 .extra1 = &minolduid, 1357 .extra2 = &maxolduid, 1358 }, 1359 { 1360 .ctl_name = FS_OVERFLOWGID, 1361 .procname = "overflowgid", 1362 .data = &fs_overflowgid, 1363 .maxlen = sizeof(int), 1364 .mode = 0644, 1365 .proc_handler = &proc_dointvec_minmax, 1366 .strategy = &sysctl_intvec, 1367 .extra1 = &minolduid, 1368 .extra2 = &maxolduid, 1369 }, 1370 #ifdef CONFIG_FILE_LOCKING 1371 { 1372 .ctl_name = FS_LEASES, 1373 .procname = "leases-enable", 1374 .data = &leases_enable, 1375 .maxlen = sizeof(int), 1376 .mode = 0644, 1377 .proc_handler = &proc_dointvec, 1378 }, 1379 #endif 1380 #ifdef CONFIG_DNOTIFY 1381 { 1382 .ctl_name = FS_DIR_NOTIFY, 1383 .procname = "dir-notify-enable", 1384 .data = &dir_notify_enable, 1385 .maxlen = sizeof(int), 1386 .mode = 0644, 1387 .proc_handler = &proc_dointvec, 1388 }, 1389 #endif 1390 #ifdef CONFIG_MMU 1391 #ifdef CONFIG_FILE_LOCKING 1392 { 1393 .ctl_name = FS_LEASE_TIME, 1394 .procname = "lease-break-time", 1395 .data = &lease_break_time, 1396 .maxlen = sizeof(int), 1397 .mode = 0644, 1398 .proc_handler = &proc_dointvec, 1399 }, 1400 #endif 1401 #ifdef CONFIG_AIO 1402 { 1403 .procname = "aio-nr", 1404 .data = &aio_nr, 1405 .maxlen = sizeof(aio_nr), 1406 .mode = 0444, 1407 .proc_handler = &proc_doulongvec_minmax, 1408 }, 1409 { 1410 .procname = "aio-max-nr", 1411 .data = &aio_max_nr, 1412 .maxlen = sizeof(aio_max_nr), 1413 .mode = 0644, 1414 .proc_handler = &proc_doulongvec_minmax, 1415 }, 1416 #endif /* CONFIG_AIO */ 1417 #ifdef CONFIG_INOTIFY_USER 1418 { 1419 .ctl_name = FS_INOTIFY, 1420 .procname = "inotify", 1421 .mode = 0555, 1422 .child = inotify_table, 1423 }, 1424 #endif 1425 #ifdef CONFIG_EPOLL 1426 { 1427 .procname = "epoll", 1428 .mode = 0555, 1429 .child = epoll_table, 1430 }, 1431 #endif 1432 #endif 1433 { 1434 .ctl_name = KERN_SETUID_DUMPABLE, 1435 .procname = "suid_dumpable", 1436 .data = &suid_dumpable, 1437 .maxlen = sizeof(int), 1438 .mode = 0644, 1439 .proc_handler = &proc_dointvec_minmax, 1440 .strategy = &sysctl_intvec, 1441 .extra1 = &zero, 1442 .extra2 = &two, 1443 }, 1444 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1445 { 1446 .ctl_name = CTL_UNNUMBERED, 1447 .procname = "binfmt_misc", 1448 .mode = 0555, 1449 .child = binfmt_misc_table, 1450 }, 1451 #endif 1452 /* 1453 * NOTE: do not add new entries to this table unless you have read 1454 * Documentation/sysctl/ctl_unnumbered.txt 1455 */ 1456 { .ctl_name = 0 } 1457 }; 1458 1459 static struct ctl_table debug_table[] = { 1460 #if defined(CONFIG_X86) || defined(CONFIG_PPC) 1461 { 1462 .ctl_name = CTL_UNNUMBERED, 1463 .procname = "exception-trace", 1464 .data = &show_unhandled_signals, 1465 .maxlen = sizeof(int), 1466 .mode = 0644, 1467 .proc_handler = proc_dointvec 1468 }, 1469 #endif 1470 { .ctl_name = 0 } 1471 }; 1472 1473 static struct ctl_table dev_table[] = { 1474 { .ctl_name = 0 } 1475 }; 1476 1477 static DEFINE_SPINLOCK(sysctl_lock); 1478 1479 /* called under sysctl_lock */ 1480 static int use_table(struct ctl_table_header *p) 1481 { 1482 if (unlikely(p->unregistering)) 1483 return 0; 1484 p->used++; 1485 return 1; 1486 } 1487 1488 /* called under sysctl_lock */ 1489 static void unuse_table(struct ctl_table_header *p) 1490 { 1491 if (!--p->used) 1492 if (unlikely(p->unregistering)) 1493 complete(p->unregistering); 1494 } 1495 1496 /* called under sysctl_lock, will reacquire if has to wait */ 1497 static void start_unregistering(struct ctl_table_header *p) 1498 { 1499 /* 1500 * if p->used is 0, nobody will ever touch that entry again; 1501 * we'll eliminate all paths to it before dropping sysctl_lock 1502 */ 1503 if (unlikely(p->used)) { 1504 struct completion wait; 1505 init_completion(&wait); 1506 p->unregistering = &wait; 1507 spin_unlock(&sysctl_lock); 1508 wait_for_completion(&wait); 1509 spin_lock(&sysctl_lock); 1510 } else { 1511 /* anything non-NULL; we'll never dereference it */ 1512 p->unregistering = ERR_PTR(-EINVAL); 1513 } 1514 /* 1515 * do not remove from the list until nobody holds it; walking the 1516 * list in do_sysctl() relies on that. 1517 */ 1518 list_del_init(&p->ctl_entry); 1519 } 1520 1521 void sysctl_head_get(struct ctl_table_header *head) 1522 { 1523 spin_lock(&sysctl_lock); 1524 head->count++; 1525 spin_unlock(&sysctl_lock); 1526 } 1527 1528 void sysctl_head_put(struct ctl_table_header *head) 1529 { 1530 spin_lock(&sysctl_lock); 1531 if (!--head->count) 1532 kfree(head); 1533 spin_unlock(&sysctl_lock); 1534 } 1535 1536 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1537 { 1538 if (!head) 1539 BUG(); 1540 spin_lock(&sysctl_lock); 1541 if (!use_table(head)) 1542 head = ERR_PTR(-ENOENT); 1543 spin_unlock(&sysctl_lock); 1544 return head; 1545 } 1546 1547 void sysctl_head_finish(struct ctl_table_header *head) 1548 { 1549 if (!head) 1550 return; 1551 spin_lock(&sysctl_lock); 1552 unuse_table(head); 1553 spin_unlock(&sysctl_lock); 1554 } 1555 1556 static struct ctl_table_set * 1557 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1558 { 1559 struct ctl_table_set *set = &root->default_set; 1560 if (root->lookup) 1561 set = root->lookup(root, namespaces); 1562 return set; 1563 } 1564 1565 static struct list_head * 1566 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1567 { 1568 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1569 return &set->list; 1570 } 1571 1572 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1573 struct ctl_table_header *prev) 1574 { 1575 struct ctl_table_root *root; 1576 struct list_head *header_list; 1577 struct ctl_table_header *head; 1578 struct list_head *tmp; 1579 1580 spin_lock(&sysctl_lock); 1581 if (prev) { 1582 head = prev; 1583 tmp = &prev->ctl_entry; 1584 unuse_table(prev); 1585 goto next; 1586 } 1587 tmp = &root_table_header.ctl_entry; 1588 for (;;) { 1589 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1590 1591 if (!use_table(head)) 1592 goto next; 1593 spin_unlock(&sysctl_lock); 1594 return head; 1595 next: 1596 root = head->root; 1597 tmp = tmp->next; 1598 header_list = lookup_header_list(root, namespaces); 1599 if (tmp != header_list) 1600 continue; 1601 1602 do { 1603 root = list_entry(root->root_list.next, 1604 struct ctl_table_root, root_list); 1605 if (root == &sysctl_table_root) 1606 goto out; 1607 header_list = lookup_header_list(root, namespaces); 1608 } while (list_empty(header_list)); 1609 tmp = header_list->next; 1610 } 1611 out: 1612 spin_unlock(&sysctl_lock); 1613 return NULL; 1614 } 1615 1616 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1617 { 1618 return __sysctl_head_next(current->nsproxy, prev); 1619 } 1620 1621 void register_sysctl_root(struct ctl_table_root *root) 1622 { 1623 spin_lock(&sysctl_lock); 1624 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1625 spin_unlock(&sysctl_lock); 1626 } 1627 1628 #ifdef CONFIG_SYSCTL_SYSCALL 1629 /* Perform the actual read/write of a sysctl table entry. */ 1630 static int do_sysctl_strategy(struct ctl_table_root *root, 1631 struct ctl_table *table, 1632 void __user *oldval, size_t __user *oldlenp, 1633 void __user *newval, size_t newlen) 1634 { 1635 int op = 0, rc; 1636 1637 if (oldval) 1638 op |= MAY_READ; 1639 if (newval) 1640 op |= MAY_WRITE; 1641 if (sysctl_perm(root, table, op)) 1642 return -EPERM; 1643 1644 if (table->strategy) { 1645 rc = table->strategy(table, oldval, oldlenp, newval, newlen); 1646 if (rc < 0) 1647 return rc; 1648 if (rc > 0) 1649 return 0; 1650 } 1651 1652 /* If there is no strategy routine, or if the strategy returns 1653 * zero, proceed with automatic r/w */ 1654 if (table->data && table->maxlen) { 1655 rc = sysctl_data(table, oldval, oldlenp, newval, newlen); 1656 if (rc < 0) 1657 return rc; 1658 } 1659 return 0; 1660 } 1661 1662 static int parse_table(int __user *name, int nlen, 1663 void __user *oldval, size_t __user *oldlenp, 1664 void __user *newval, size_t newlen, 1665 struct ctl_table_root *root, 1666 struct ctl_table *table) 1667 { 1668 int n; 1669 repeat: 1670 if (!nlen) 1671 return -ENOTDIR; 1672 if (get_user(n, name)) 1673 return -EFAULT; 1674 for ( ; table->ctl_name || table->procname; table++) { 1675 if (!table->ctl_name) 1676 continue; 1677 if (n == table->ctl_name) { 1678 int error; 1679 if (table->child) { 1680 if (sysctl_perm(root, table, MAY_EXEC)) 1681 return -EPERM; 1682 name++; 1683 nlen--; 1684 table = table->child; 1685 goto repeat; 1686 } 1687 error = do_sysctl_strategy(root, table, 1688 oldval, oldlenp, 1689 newval, newlen); 1690 return error; 1691 } 1692 } 1693 return -ENOTDIR; 1694 } 1695 1696 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1697 void __user *newval, size_t newlen) 1698 { 1699 struct ctl_table_header *head; 1700 int error = -ENOTDIR; 1701 1702 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1703 return -ENOTDIR; 1704 if (oldval) { 1705 int old_len; 1706 if (!oldlenp || get_user(old_len, oldlenp)) 1707 return -EFAULT; 1708 } 1709 1710 for (head = sysctl_head_next(NULL); head; 1711 head = sysctl_head_next(head)) { 1712 error = parse_table(name, nlen, oldval, oldlenp, 1713 newval, newlen, 1714 head->root, head->ctl_table); 1715 if (error != -ENOTDIR) { 1716 sysctl_head_finish(head); 1717 break; 1718 } 1719 } 1720 return error; 1721 } 1722 1723 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args) 1724 { 1725 struct __sysctl_args tmp; 1726 int error; 1727 1728 if (copy_from_user(&tmp, args, sizeof(tmp))) 1729 return -EFAULT; 1730 1731 error = deprecated_sysctl_warning(&tmp); 1732 if (error) 1733 goto out; 1734 1735 lock_kernel(); 1736 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1737 tmp.newval, tmp.newlen); 1738 unlock_kernel(); 1739 out: 1740 return error; 1741 } 1742 #endif /* CONFIG_SYSCTL_SYSCALL */ 1743 1744 /* 1745 * sysctl_perm does NOT grant the superuser all rights automatically, because 1746 * some sysctl variables are readonly even to root. 1747 */ 1748 1749 static int test_perm(int mode, int op) 1750 { 1751 if (!current_euid()) 1752 mode >>= 6; 1753 else if (in_egroup_p(0)) 1754 mode >>= 3; 1755 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1756 return 0; 1757 return -EACCES; 1758 } 1759 1760 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1761 { 1762 int error; 1763 int mode; 1764 1765 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1766 if (error) 1767 return error; 1768 1769 if (root->permissions) 1770 mode = root->permissions(root, current->nsproxy, table); 1771 else 1772 mode = table->mode; 1773 1774 return test_perm(mode, op); 1775 } 1776 1777 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1778 { 1779 for (; table->ctl_name || table->procname; table++) { 1780 table->parent = parent; 1781 if (table->child) 1782 sysctl_set_parent(table, table->child); 1783 } 1784 } 1785 1786 static __init int sysctl_init(void) 1787 { 1788 sysctl_set_parent(NULL, root_table); 1789 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1790 { 1791 int err; 1792 err = sysctl_check_table(current->nsproxy, root_table); 1793 } 1794 #endif 1795 return 0; 1796 } 1797 1798 core_initcall(sysctl_init); 1799 1800 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1801 struct ctl_table *table) 1802 { 1803 struct ctl_table *p; 1804 const char *s = branch->procname; 1805 1806 /* branch should have named subdirectory as its first element */ 1807 if (!s || !branch->child) 1808 return NULL; 1809 1810 /* ... and nothing else */ 1811 if (branch[1].procname || branch[1].ctl_name) 1812 return NULL; 1813 1814 /* table should contain subdirectory with the same name */ 1815 for (p = table; p->procname || p->ctl_name; p++) { 1816 if (!p->child) 1817 continue; 1818 if (p->procname && strcmp(p->procname, s) == 0) 1819 return p; 1820 } 1821 return NULL; 1822 } 1823 1824 /* see if attaching q to p would be an improvement */ 1825 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1826 { 1827 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1828 struct ctl_table *next; 1829 int is_better = 0; 1830 int not_in_parent = !p->attached_by; 1831 1832 while ((next = is_branch_in(by, to)) != NULL) { 1833 if (by == q->attached_by) 1834 is_better = 1; 1835 if (to == p->attached_by) 1836 not_in_parent = 1; 1837 by = by->child; 1838 to = next->child; 1839 } 1840 1841 if (is_better && not_in_parent) { 1842 q->attached_by = by; 1843 q->attached_to = to; 1844 q->parent = p; 1845 } 1846 } 1847 1848 /** 1849 * __register_sysctl_paths - register a sysctl hierarchy 1850 * @root: List of sysctl headers to register on 1851 * @namespaces: Data to compute which lists of sysctl entries are visible 1852 * @path: The path to the directory the sysctl table is in. 1853 * @table: the top-level table structure 1854 * 1855 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1856 * array. A completely 0 filled entry terminates the table. 1857 * 1858 * The members of the &struct ctl_table structure are used as follows: 1859 * 1860 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1861 * must be unique within that level of sysctl 1862 * 1863 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1864 * enter a sysctl file 1865 * 1866 * data - a pointer to data for use by proc_handler 1867 * 1868 * maxlen - the maximum size in bytes of the data 1869 * 1870 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1871 * 1872 * child - a pointer to the child sysctl table if this entry is a directory, or 1873 * %NULL. 1874 * 1875 * proc_handler - the text handler routine (described below) 1876 * 1877 * strategy - the strategy routine (described below) 1878 * 1879 * de - for internal use by the sysctl routines 1880 * 1881 * extra1, extra2 - extra pointers usable by the proc handler routines 1882 * 1883 * Leaf nodes in the sysctl tree will be represented by a single file 1884 * under /proc; non-leaf nodes will be represented by directories. 1885 * 1886 * sysctl(2) can automatically manage read and write requests through 1887 * the sysctl table. The data and maxlen fields of the ctl_table 1888 * struct enable minimal validation of the values being written to be 1889 * performed, and the mode field allows minimal authentication. 1890 * 1891 * More sophisticated management can be enabled by the provision of a 1892 * strategy routine with the table entry. This will be called before 1893 * any automatic read or write of the data is performed. 1894 * 1895 * The strategy routine may return 1896 * 1897 * < 0 - Error occurred (error is passed to user process) 1898 * 1899 * 0 - OK - proceed with automatic read or write. 1900 * 1901 * > 0 - OK - read or write has been done by the strategy routine, so 1902 * return immediately. 1903 * 1904 * There must be a proc_handler routine for any terminal nodes 1905 * mirrored under /proc/sys (non-terminals are handled by a built-in 1906 * directory handler). Several default handlers are available to 1907 * cover common cases - 1908 * 1909 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1910 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1911 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1912 * 1913 * It is the handler's job to read the input buffer from user memory 1914 * and process it. The handler should return 0 on success. 1915 * 1916 * This routine returns %NULL on a failure to register, and a pointer 1917 * to the table header on success. 1918 */ 1919 struct ctl_table_header *__register_sysctl_paths( 1920 struct ctl_table_root *root, 1921 struct nsproxy *namespaces, 1922 const struct ctl_path *path, struct ctl_table *table) 1923 { 1924 struct ctl_table_header *header; 1925 struct ctl_table *new, **prevp; 1926 unsigned int n, npath; 1927 struct ctl_table_set *set; 1928 1929 /* Count the path components */ 1930 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) 1931 ; 1932 1933 /* 1934 * For each path component, allocate a 2-element ctl_table array. 1935 * The first array element will be filled with the sysctl entry 1936 * for this, the second will be the sentinel (ctl_name == 0). 1937 * 1938 * We allocate everything in one go so that we don't have to 1939 * worry about freeing additional memory in unregister_sysctl_table. 1940 */ 1941 header = kzalloc(sizeof(struct ctl_table_header) + 1942 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1943 if (!header) 1944 return NULL; 1945 1946 new = (struct ctl_table *) (header + 1); 1947 1948 /* Now connect the dots */ 1949 prevp = &header->ctl_table; 1950 for (n = 0; n < npath; ++n, ++path) { 1951 /* Copy the procname */ 1952 new->procname = path->procname; 1953 new->ctl_name = path->ctl_name; 1954 new->mode = 0555; 1955 1956 *prevp = new; 1957 prevp = &new->child; 1958 1959 new += 2; 1960 } 1961 *prevp = table; 1962 header->ctl_table_arg = table; 1963 1964 INIT_LIST_HEAD(&header->ctl_entry); 1965 header->used = 0; 1966 header->unregistering = NULL; 1967 header->root = root; 1968 sysctl_set_parent(NULL, header->ctl_table); 1969 header->count = 1; 1970 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1971 if (sysctl_check_table(namespaces, header->ctl_table)) { 1972 kfree(header); 1973 return NULL; 1974 } 1975 #endif 1976 spin_lock(&sysctl_lock); 1977 header->set = lookup_header_set(root, namespaces); 1978 header->attached_by = header->ctl_table; 1979 header->attached_to = root_table; 1980 header->parent = &root_table_header; 1981 for (set = header->set; set; set = set->parent) { 1982 struct ctl_table_header *p; 1983 list_for_each_entry(p, &set->list, ctl_entry) { 1984 if (p->unregistering) 1985 continue; 1986 try_attach(p, header); 1987 } 1988 } 1989 header->parent->count++; 1990 list_add_tail(&header->ctl_entry, &header->set->list); 1991 spin_unlock(&sysctl_lock); 1992 1993 return header; 1994 } 1995 1996 /** 1997 * register_sysctl_table_path - register a sysctl table hierarchy 1998 * @path: The path to the directory the sysctl table is in. 1999 * @table: the top-level table structure 2000 * 2001 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 2002 * array. A completely 0 filled entry terminates the table. 2003 * 2004 * See __register_sysctl_paths for more details. 2005 */ 2006 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2007 struct ctl_table *table) 2008 { 2009 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 2010 path, table); 2011 } 2012 2013 /** 2014 * register_sysctl_table - register a sysctl table hierarchy 2015 * @table: the top-level table structure 2016 * 2017 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 2018 * array. A completely 0 filled entry terminates the table. 2019 * 2020 * See register_sysctl_paths for more details. 2021 */ 2022 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 2023 { 2024 static const struct ctl_path null_path[] = { {} }; 2025 2026 return register_sysctl_paths(null_path, table); 2027 } 2028 2029 /** 2030 * unregister_sysctl_table - unregister a sysctl table hierarchy 2031 * @header: the header returned from register_sysctl_table 2032 * 2033 * Unregisters the sysctl table and all children. proc entries may not 2034 * actually be removed until they are no longer used by anyone. 2035 */ 2036 void unregister_sysctl_table(struct ctl_table_header * header) 2037 { 2038 might_sleep(); 2039 2040 if (header == NULL) 2041 return; 2042 2043 spin_lock(&sysctl_lock); 2044 start_unregistering(header); 2045 if (!--header->parent->count) { 2046 WARN_ON(1); 2047 kfree(header->parent); 2048 } 2049 if (!--header->count) 2050 kfree(header); 2051 spin_unlock(&sysctl_lock); 2052 } 2053 2054 int sysctl_is_seen(struct ctl_table_header *p) 2055 { 2056 struct ctl_table_set *set = p->set; 2057 int res; 2058 spin_lock(&sysctl_lock); 2059 if (p->unregistering) 2060 res = 0; 2061 else if (!set->is_seen) 2062 res = 1; 2063 else 2064 res = set->is_seen(set); 2065 spin_unlock(&sysctl_lock); 2066 return res; 2067 } 2068 2069 void setup_sysctl_set(struct ctl_table_set *p, 2070 struct ctl_table_set *parent, 2071 int (*is_seen)(struct ctl_table_set *)) 2072 { 2073 INIT_LIST_HEAD(&p->list); 2074 p->parent = parent ? parent : &sysctl_table_root.default_set; 2075 p->is_seen = is_seen; 2076 } 2077 2078 #else /* !CONFIG_SYSCTL */ 2079 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2080 { 2081 return NULL; 2082 } 2083 2084 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2085 struct ctl_table *table) 2086 { 2087 return NULL; 2088 } 2089 2090 void unregister_sysctl_table(struct ctl_table_header * table) 2091 { 2092 } 2093 2094 void setup_sysctl_set(struct ctl_table_set *p, 2095 struct ctl_table_set *parent, 2096 int (*is_seen)(struct ctl_table_set *)) 2097 { 2098 } 2099 2100 void sysctl_head_put(struct ctl_table_header *head) 2101 { 2102 } 2103 2104 #endif /* CONFIG_SYSCTL */ 2105 2106 /* 2107 * /proc/sys support 2108 */ 2109 2110 #ifdef CONFIG_PROC_SYSCTL 2111 2112 static int _proc_do_string(void* data, int maxlen, int write, 2113 struct file *filp, void __user *buffer, 2114 size_t *lenp, loff_t *ppos) 2115 { 2116 size_t len; 2117 char __user *p; 2118 char c; 2119 2120 if (!data || !maxlen || !*lenp) { 2121 *lenp = 0; 2122 return 0; 2123 } 2124 2125 if (write) { 2126 len = 0; 2127 p = buffer; 2128 while (len < *lenp) { 2129 if (get_user(c, p++)) 2130 return -EFAULT; 2131 if (c == 0 || c == '\n') 2132 break; 2133 len++; 2134 } 2135 if (len >= maxlen) 2136 len = maxlen-1; 2137 if(copy_from_user(data, buffer, len)) 2138 return -EFAULT; 2139 ((char *) data)[len] = 0; 2140 *ppos += *lenp; 2141 } else { 2142 len = strlen(data); 2143 if (len > maxlen) 2144 len = maxlen; 2145 2146 if (*ppos > len) { 2147 *lenp = 0; 2148 return 0; 2149 } 2150 2151 data += *ppos; 2152 len -= *ppos; 2153 2154 if (len > *lenp) 2155 len = *lenp; 2156 if (len) 2157 if(copy_to_user(buffer, data, len)) 2158 return -EFAULT; 2159 if (len < *lenp) { 2160 if(put_user('\n', ((char __user *) buffer) + len)) 2161 return -EFAULT; 2162 len++; 2163 } 2164 *lenp = len; 2165 *ppos += len; 2166 } 2167 return 0; 2168 } 2169 2170 /** 2171 * proc_dostring - read a string sysctl 2172 * @table: the sysctl table 2173 * @write: %TRUE if this is a write to the sysctl file 2174 * @filp: the file structure 2175 * @buffer: the user buffer 2176 * @lenp: the size of the user buffer 2177 * @ppos: file position 2178 * 2179 * Reads/writes a string from/to the user buffer. If the kernel 2180 * buffer provided is not large enough to hold the string, the 2181 * string is truncated. The copied string is %NULL-terminated. 2182 * If the string is being read by the user process, it is copied 2183 * and a newline '\n' is added. It is truncated if the buffer is 2184 * not large enough. 2185 * 2186 * Returns 0 on success. 2187 */ 2188 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2189 void __user *buffer, size_t *lenp, loff_t *ppos) 2190 { 2191 return _proc_do_string(table->data, table->maxlen, write, filp, 2192 buffer, lenp, ppos); 2193 } 2194 2195 2196 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 2197 int *valp, 2198 int write, void *data) 2199 { 2200 if (write) { 2201 *valp = *negp ? -*lvalp : *lvalp; 2202 } else { 2203 int val = *valp; 2204 if (val < 0) { 2205 *negp = -1; 2206 *lvalp = (unsigned long)-val; 2207 } else { 2208 *negp = 0; 2209 *lvalp = (unsigned long)val; 2210 } 2211 } 2212 return 0; 2213 } 2214 2215 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2216 int write, struct file *filp, void __user *buffer, 2217 size_t *lenp, loff_t *ppos, 2218 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2219 int write, void *data), 2220 void *data) 2221 { 2222 #define TMPBUFLEN 21 2223 int *i, vleft, first=1, neg, val; 2224 unsigned long lval; 2225 size_t left, len; 2226 2227 char buf[TMPBUFLEN], *p; 2228 char __user *s = buffer; 2229 2230 if (!tbl_data || !table->maxlen || !*lenp || 2231 (*ppos && !write)) { 2232 *lenp = 0; 2233 return 0; 2234 } 2235 2236 i = (int *) tbl_data; 2237 vleft = table->maxlen / sizeof(*i); 2238 left = *lenp; 2239 2240 if (!conv) 2241 conv = do_proc_dointvec_conv; 2242 2243 for (; left && vleft--; i++, first=0) { 2244 if (write) { 2245 while (left) { 2246 char c; 2247 if (get_user(c, s)) 2248 return -EFAULT; 2249 if (!isspace(c)) 2250 break; 2251 left--; 2252 s++; 2253 } 2254 if (!left) 2255 break; 2256 neg = 0; 2257 len = left; 2258 if (len > sizeof(buf) - 1) 2259 len = sizeof(buf) - 1; 2260 if (copy_from_user(buf, s, len)) 2261 return -EFAULT; 2262 buf[len] = 0; 2263 p = buf; 2264 if (*p == '-' && left > 1) { 2265 neg = 1; 2266 p++; 2267 } 2268 if (*p < '0' || *p > '9') 2269 break; 2270 2271 lval = simple_strtoul(p, &p, 0); 2272 2273 len = p-buf; 2274 if ((len < left) && *p && !isspace(*p)) 2275 break; 2276 if (neg) 2277 val = -val; 2278 s += len; 2279 left -= len; 2280 2281 if (conv(&neg, &lval, i, 1, data)) 2282 break; 2283 } else { 2284 p = buf; 2285 if (!first) 2286 *p++ = '\t'; 2287 2288 if (conv(&neg, &lval, i, 0, data)) 2289 break; 2290 2291 sprintf(p, "%s%lu", neg ? "-" : "", lval); 2292 len = strlen(buf); 2293 if (len > left) 2294 len = left; 2295 if(copy_to_user(s, buf, len)) 2296 return -EFAULT; 2297 left -= len; 2298 s += len; 2299 } 2300 } 2301 2302 if (!write && !first && left) { 2303 if(put_user('\n', s)) 2304 return -EFAULT; 2305 left--, s++; 2306 } 2307 if (write) { 2308 while (left) { 2309 char c; 2310 if (get_user(c, s++)) 2311 return -EFAULT; 2312 if (!isspace(c)) 2313 break; 2314 left--; 2315 } 2316 } 2317 if (write && first) 2318 return -EINVAL; 2319 *lenp -= left; 2320 *ppos += *lenp; 2321 return 0; 2322 #undef TMPBUFLEN 2323 } 2324 2325 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2326 void __user *buffer, size_t *lenp, loff_t *ppos, 2327 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2328 int write, void *data), 2329 void *data) 2330 { 2331 return __do_proc_dointvec(table->data, table, write, filp, 2332 buffer, lenp, ppos, conv, data); 2333 } 2334 2335 /** 2336 * proc_dointvec - read a vector of integers 2337 * @table: the sysctl table 2338 * @write: %TRUE if this is a write to the sysctl file 2339 * @filp: the file structure 2340 * @buffer: the user buffer 2341 * @lenp: the size of the user buffer 2342 * @ppos: file position 2343 * 2344 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2345 * values from/to the user buffer, treated as an ASCII string. 2346 * 2347 * Returns 0 on success. 2348 */ 2349 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2350 void __user *buffer, size_t *lenp, loff_t *ppos) 2351 { 2352 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2353 NULL,NULL); 2354 } 2355 2356 /* 2357 * Taint values can only be increased 2358 * This means we can safely use a temporary. 2359 */ 2360 static int proc_taint(struct ctl_table *table, int write, struct file *filp, 2361 void __user *buffer, size_t *lenp, loff_t *ppos) 2362 { 2363 struct ctl_table t; 2364 unsigned long tmptaint = get_taint(); 2365 int err; 2366 2367 if (write && !capable(CAP_SYS_ADMIN)) 2368 return -EPERM; 2369 2370 t = *table; 2371 t.data = &tmptaint; 2372 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos); 2373 if (err < 0) 2374 return err; 2375 2376 if (write) { 2377 /* 2378 * Poor man's atomic or. Not worth adding a primitive 2379 * to everyone's atomic.h for this 2380 */ 2381 int i; 2382 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2383 if ((tmptaint >> i) & 1) 2384 add_taint(i); 2385 } 2386 } 2387 2388 return err; 2389 } 2390 2391 struct do_proc_dointvec_minmax_conv_param { 2392 int *min; 2393 int *max; 2394 }; 2395 2396 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 2397 int *valp, 2398 int write, void *data) 2399 { 2400 struct do_proc_dointvec_minmax_conv_param *param = data; 2401 if (write) { 2402 int val = *negp ? -*lvalp : *lvalp; 2403 if ((param->min && *param->min > val) || 2404 (param->max && *param->max < val)) 2405 return -EINVAL; 2406 *valp = val; 2407 } else { 2408 int val = *valp; 2409 if (val < 0) { 2410 *negp = -1; 2411 *lvalp = (unsigned long)-val; 2412 } else { 2413 *negp = 0; 2414 *lvalp = (unsigned long)val; 2415 } 2416 } 2417 return 0; 2418 } 2419 2420 /** 2421 * proc_dointvec_minmax - read a vector of integers with min/max values 2422 * @table: the sysctl table 2423 * @write: %TRUE if this is a write to the sysctl file 2424 * @filp: the file structure 2425 * @buffer: the user buffer 2426 * @lenp: the size of the user buffer 2427 * @ppos: file position 2428 * 2429 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2430 * values from/to the user buffer, treated as an ASCII string. 2431 * 2432 * This routine will ensure the values are within the range specified by 2433 * table->extra1 (min) and table->extra2 (max). 2434 * 2435 * Returns 0 on success. 2436 */ 2437 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2438 void __user *buffer, size_t *lenp, loff_t *ppos) 2439 { 2440 struct do_proc_dointvec_minmax_conv_param param = { 2441 .min = (int *) table->extra1, 2442 .max = (int *) table->extra2, 2443 }; 2444 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2445 do_proc_dointvec_minmax_conv, ¶m); 2446 } 2447 2448 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2449 struct file *filp, 2450 void __user *buffer, 2451 size_t *lenp, loff_t *ppos, 2452 unsigned long convmul, 2453 unsigned long convdiv) 2454 { 2455 #define TMPBUFLEN 21 2456 unsigned long *i, *min, *max, val; 2457 int vleft, first=1, neg; 2458 size_t len, left; 2459 char buf[TMPBUFLEN], *p; 2460 char __user *s = buffer; 2461 2462 if (!data || !table->maxlen || !*lenp || 2463 (*ppos && !write)) { 2464 *lenp = 0; 2465 return 0; 2466 } 2467 2468 i = (unsigned long *) data; 2469 min = (unsigned long *) table->extra1; 2470 max = (unsigned long *) table->extra2; 2471 vleft = table->maxlen / sizeof(unsigned long); 2472 left = *lenp; 2473 2474 for (; left && vleft--; i++, min++, max++, first=0) { 2475 if (write) { 2476 while (left) { 2477 char c; 2478 if (get_user(c, s)) 2479 return -EFAULT; 2480 if (!isspace(c)) 2481 break; 2482 left--; 2483 s++; 2484 } 2485 if (!left) 2486 break; 2487 neg = 0; 2488 len = left; 2489 if (len > TMPBUFLEN-1) 2490 len = TMPBUFLEN-1; 2491 if (copy_from_user(buf, s, len)) 2492 return -EFAULT; 2493 buf[len] = 0; 2494 p = buf; 2495 if (*p == '-' && left > 1) { 2496 neg = 1; 2497 p++; 2498 } 2499 if (*p < '0' || *p > '9') 2500 break; 2501 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 2502 len = p-buf; 2503 if ((len < left) && *p && !isspace(*p)) 2504 break; 2505 if (neg) 2506 val = -val; 2507 s += len; 2508 left -= len; 2509 2510 if(neg) 2511 continue; 2512 if ((min && val < *min) || (max && val > *max)) 2513 continue; 2514 *i = val; 2515 } else { 2516 p = buf; 2517 if (!first) 2518 *p++ = '\t'; 2519 sprintf(p, "%lu", convdiv * (*i) / convmul); 2520 len = strlen(buf); 2521 if (len > left) 2522 len = left; 2523 if(copy_to_user(s, buf, len)) 2524 return -EFAULT; 2525 left -= len; 2526 s += len; 2527 } 2528 } 2529 2530 if (!write && !first && left) { 2531 if(put_user('\n', s)) 2532 return -EFAULT; 2533 left--, s++; 2534 } 2535 if (write) { 2536 while (left) { 2537 char c; 2538 if (get_user(c, s++)) 2539 return -EFAULT; 2540 if (!isspace(c)) 2541 break; 2542 left--; 2543 } 2544 } 2545 if (write && first) 2546 return -EINVAL; 2547 *lenp -= left; 2548 *ppos += *lenp; 2549 return 0; 2550 #undef TMPBUFLEN 2551 } 2552 2553 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2554 struct file *filp, 2555 void __user *buffer, 2556 size_t *lenp, loff_t *ppos, 2557 unsigned long convmul, 2558 unsigned long convdiv) 2559 { 2560 return __do_proc_doulongvec_minmax(table->data, table, write, 2561 filp, buffer, lenp, ppos, convmul, convdiv); 2562 } 2563 2564 /** 2565 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2566 * @table: the sysctl table 2567 * @write: %TRUE if this is a write to the sysctl file 2568 * @filp: the file structure 2569 * @buffer: the user buffer 2570 * @lenp: the size of the user buffer 2571 * @ppos: file position 2572 * 2573 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2574 * values from/to the user buffer, treated as an ASCII string. 2575 * 2576 * This routine will ensure the values are within the range specified by 2577 * table->extra1 (min) and table->extra2 (max). 2578 * 2579 * Returns 0 on success. 2580 */ 2581 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2582 void __user *buffer, size_t *lenp, loff_t *ppos) 2583 { 2584 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 2585 } 2586 2587 /** 2588 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2589 * @table: the sysctl table 2590 * @write: %TRUE if this is a write to the sysctl file 2591 * @filp: the file structure 2592 * @buffer: the user buffer 2593 * @lenp: the size of the user buffer 2594 * @ppos: file position 2595 * 2596 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2597 * values from/to the user buffer, treated as an ASCII string. The values 2598 * are treated as milliseconds, and converted to jiffies when they are stored. 2599 * 2600 * This routine will ensure the values are within the range specified by 2601 * table->extra1 (min) and table->extra2 (max). 2602 * 2603 * Returns 0 on success. 2604 */ 2605 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2606 struct file *filp, 2607 void __user *buffer, 2608 size_t *lenp, loff_t *ppos) 2609 { 2610 return do_proc_doulongvec_minmax(table, write, filp, buffer, 2611 lenp, ppos, HZ, 1000l); 2612 } 2613 2614 2615 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2616 int *valp, 2617 int write, void *data) 2618 { 2619 if (write) { 2620 if (*lvalp > LONG_MAX / HZ) 2621 return 1; 2622 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2623 } else { 2624 int val = *valp; 2625 unsigned long lval; 2626 if (val < 0) { 2627 *negp = -1; 2628 lval = (unsigned long)-val; 2629 } else { 2630 *negp = 0; 2631 lval = (unsigned long)val; 2632 } 2633 *lvalp = lval / HZ; 2634 } 2635 return 0; 2636 } 2637 2638 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2639 int *valp, 2640 int write, void *data) 2641 { 2642 if (write) { 2643 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2644 return 1; 2645 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2646 } else { 2647 int val = *valp; 2648 unsigned long lval; 2649 if (val < 0) { 2650 *negp = -1; 2651 lval = (unsigned long)-val; 2652 } else { 2653 *negp = 0; 2654 lval = (unsigned long)val; 2655 } 2656 *lvalp = jiffies_to_clock_t(lval); 2657 } 2658 return 0; 2659 } 2660 2661 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2662 int *valp, 2663 int write, void *data) 2664 { 2665 if (write) { 2666 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2667 } else { 2668 int val = *valp; 2669 unsigned long lval; 2670 if (val < 0) { 2671 *negp = -1; 2672 lval = (unsigned long)-val; 2673 } else { 2674 *negp = 0; 2675 lval = (unsigned long)val; 2676 } 2677 *lvalp = jiffies_to_msecs(lval); 2678 } 2679 return 0; 2680 } 2681 2682 /** 2683 * proc_dointvec_jiffies - read a vector of integers as seconds 2684 * @table: the sysctl table 2685 * @write: %TRUE if this is a write to the sysctl file 2686 * @filp: the file structure 2687 * @buffer: the user buffer 2688 * @lenp: the size of the user buffer 2689 * @ppos: file position 2690 * 2691 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2692 * values from/to the user buffer, treated as an ASCII string. 2693 * The values read are assumed to be in seconds, and are converted into 2694 * jiffies. 2695 * 2696 * Returns 0 on success. 2697 */ 2698 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2699 void __user *buffer, size_t *lenp, loff_t *ppos) 2700 { 2701 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2702 do_proc_dointvec_jiffies_conv,NULL); 2703 } 2704 2705 /** 2706 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2707 * @table: the sysctl table 2708 * @write: %TRUE if this is a write to the sysctl file 2709 * @filp: the file structure 2710 * @buffer: the user buffer 2711 * @lenp: the size of the user buffer 2712 * @ppos: pointer to the file position 2713 * 2714 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2715 * values from/to the user buffer, treated as an ASCII string. 2716 * The values read are assumed to be in 1/USER_HZ seconds, and 2717 * are converted into jiffies. 2718 * 2719 * Returns 0 on success. 2720 */ 2721 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2722 void __user *buffer, size_t *lenp, loff_t *ppos) 2723 { 2724 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2725 do_proc_dointvec_userhz_jiffies_conv,NULL); 2726 } 2727 2728 /** 2729 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2730 * @table: the sysctl table 2731 * @write: %TRUE if this is a write to the sysctl file 2732 * @filp: the file structure 2733 * @buffer: the user buffer 2734 * @lenp: the size of the user buffer 2735 * @ppos: file position 2736 * @ppos: the current position in the file 2737 * 2738 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2739 * values from/to the user buffer, treated as an ASCII string. 2740 * The values read are assumed to be in 1/1000 seconds, and 2741 * are converted into jiffies. 2742 * 2743 * Returns 0 on success. 2744 */ 2745 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2746 void __user *buffer, size_t *lenp, loff_t *ppos) 2747 { 2748 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2749 do_proc_dointvec_ms_jiffies_conv, NULL); 2750 } 2751 2752 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 2753 void __user *buffer, size_t *lenp, loff_t *ppos) 2754 { 2755 struct pid *new_pid; 2756 pid_t tmp; 2757 int r; 2758 2759 tmp = pid_vnr(cad_pid); 2760 2761 r = __do_proc_dointvec(&tmp, table, write, filp, buffer, 2762 lenp, ppos, NULL, NULL); 2763 if (r || !write) 2764 return r; 2765 2766 new_pid = find_get_pid(tmp); 2767 if (!new_pid) 2768 return -ESRCH; 2769 2770 put_pid(xchg(&cad_pid, new_pid)); 2771 return 0; 2772 } 2773 2774 #else /* CONFIG_PROC_FS */ 2775 2776 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2777 void __user *buffer, size_t *lenp, loff_t *ppos) 2778 { 2779 return -ENOSYS; 2780 } 2781 2782 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2783 void __user *buffer, size_t *lenp, loff_t *ppos) 2784 { 2785 return -ENOSYS; 2786 } 2787 2788 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2789 void __user *buffer, size_t *lenp, loff_t *ppos) 2790 { 2791 return -ENOSYS; 2792 } 2793 2794 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2795 void __user *buffer, size_t *lenp, loff_t *ppos) 2796 { 2797 return -ENOSYS; 2798 } 2799 2800 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2801 void __user *buffer, size_t *lenp, loff_t *ppos) 2802 { 2803 return -ENOSYS; 2804 } 2805 2806 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2807 void __user *buffer, size_t *lenp, loff_t *ppos) 2808 { 2809 return -ENOSYS; 2810 } 2811 2812 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2813 void __user *buffer, size_t *lenp, loff_t *ppos) 2814 { 2815 return -ENOSYS; 2816 } 2817 2818 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2819 struct file *filp, 2820 void __user *buffer, 2821 size_t *lenp, loff_t *ppos) 2822 { 2823 return -ENOSYS; 2824 } 2825 2826 2827 #endif /* CONFIG_PROC_FS */ 2828 2829 2830 #ifdef CONFIG_SYSCTL_SYSCALL 2831 /* 2832 * General sysctl support routines 2833 */ 2834 2835 /* The generic sysctl data routine (used if no strategy routine supplied) */ 2836 int sysctl_data(struct ctl_table *table, 2837 void __user *oldval, size_t __user *oldlenp, 2838 void __user *newval, size_t newlen) 2839 { 2840 size_t len; 2841 2842 /* Get out of I don't have a variable */ 2843 if (!table->data || !table->maxlen) 2844 return -ENOTDIR; 2845 2846 if (oldval && oldlenp) { 2847 if (get_user(len, oldlenp)) 2848 return -EFAULT; 2849 if (len) { 2850 if (len > table->maxlen) 2851 len = table->maxlen; 2852 if (copy_to_user(oldval, table->data, len)) 2853 return -EFAULT; 2854 if (put_user(len, oldlenp)) 2855 return -EFAULT; 2856 } 2857 } 2858 2859 if (newval && newlen) { 2860 if (newlen > table->maxlen) 2861 newlen = table->maxlen; 2862 2863 if (copy_from_user(table->data, newval, newlen)) 2864 return -EFAULT; 2865 } 2866 return 1; 2867 } 2868 2869 /* The generic string strategy routine: */ 2870 int sysctl_string(struct ctl_table *table, 2871 void __user *oldval, size_t __user *oldlenp, 2872 void __user *newval, size_t newlen) 2873 { 2874 if (!table->data || !table->maxlen) 2875 return -ENOTDIR; 2876 2877 if (oldval && oldlenp) { 2878 size_t bufsize; 2879 if (get_user(bufsize, oldlenp)) 2880 return -EFAULT; 2881 if (bufsize) { 2882 size_t len = strlen(table->data), copied; 2883 2884 /* This shouldn't trigger for a well-formed sysctl */ 2885 if (len > table->maxlen) 2886 len = table->maxlen; 2887 2888 /* Copy up to a max of bufsize-1 bytes of the string */ 2889 copied = (len >= bufsize) ? bufsize - 1 : len; 2890 2891 if (copy_to_user(oldval, table->data, copied) || 2892 put_user(0, (char __user *)(oldval + copied))) 2893 return -EFAULT; 2894 if (put_user(len, oldlenp)) 2895 return -EFAULT; 2896 } 2897 } 2898 if (newval && newlen) { 2899 size_t len = newlen; 2900 if (len > table->maxlen) 2901 len = table->maxlen; 2902 if(copy_from_user(table->data, newval, len)) 2903 return -EFAULT; 2904 if (len == table->maxlen) 2905 len--; 2906 ((char *) table->data)[len] = 0; 2907 } 2908 return 1; 2909 } 2910 2911 /* 2912 * This function makes sure that all of the integers in the vector 2913 * are between the minimum and maximum values given in the arrays 2914 * table->extra1 and table->extra2, respectively. 2915 */ 2916 int sysctl_intvec(struct ctl_table *table, 2917 void __user *oldval, size_t __user *oldlenp, 2918 void __user *newval, size_t newlen) 2919 { 2920 2921 if (newval && newlen) { 2922 int __user *vec = (int __user *) newval; 2923 int *min = (int *) table->extra1; 2924 int *max = (int *) table->extra2; 2925 size_t length; 2926 int i; 2927 2928 if (newlen % sizeof(int) != 0) 2929 return -EINVAL; 2930 2931 if (!table->extra1 && !table->extra2) 2932 return 0; 2933 2934 if (newlen > table->maxlen) 2935 newlen = table->maxlen; 2936 length = newlen / sizeof(int); 2937 2938 for (i = 0; i < length; i++) { 2939 int value; 2940 if (get_user(value, vec + i)) 2941 return -EFAULT; 2942 if (min && value < min[i]) 2943 return -EINVAL; 2944 if (max && value > max[i]) 2945 return -EINVAL; 2946 } 2947 } 2948 return 0; 2949 } 2950 2951 /* Strategy function to convert jiffies to seconds */ 2952 int sysctl_jiffies(struct ctl_table *table, 2953 void __user *oldval, size_t __user *oldlenp, 2954 void __user *newval, size_t newlen) 2955 { 2956 if (oldval && oldlenp) { 2957 size_t olen; 2958 2959 if (get_user(olen, oldlenp)) 2960 return -EFAULT; 2961 if (olen) { 2962 int val; 2963 2964 if (olen < sizeof(int)) 2965 return -EINVAL; 2966 2967 val = *(int *)(table->data) / HZ; 2968 if (put_user(val, (int __user *)oldval)) 2969 return -EFAULT; 2970 if (put_user(sizeof(int), oldlenp)) 2971 return -EFAULT; 2972 } 2973 } 2974 if (newval && newlen) { 2975 int new; 2976 if (newlen != sizeof(int)) 2977 return -EINVAL; 2978 if (get_user(new, (int __user *)newval)) 2979 return -EFAULT; 2980 *(int *)(table->data) = new*HZ; 2981 } 2982 return 1; 2983 } 2984 2985 /* Strategy function to convert jiffies to seconds */ 2986 int sysctl_ms_jiffies(struct ctl_table *table, 2987 void __user *oldval, size_t __user *oldlenp, 2988 void __user *newval, size_t newlen) 2989 { 2990 if (oldval && oldlenp) { 2991 size_t olen; 2992 2993 if (get_user(olen, oldlenp)) 2994 return -EFAULT; 2995 if (olen) { 2996 int val; 2997 2998 if (olen < sizeof(int)) 2999 return -EINVAL; 3000 3001 val = jiffies_to_msecs(*(int *)(table->data)); 3002 if (put_user(val, (int __user *)oldval)) 3003 return -EFAULT; 3004 if (put_user(sizeof(int), oldlenp)) 3005 return -EFAULT; 3006 } 3007 } 3008 if (newval && newlen) { 3009 int new; 3010 if (newlen != sizeof(int)) 3011 return -EINVAL; 3012 if (get_user(new, (int __user *)newval)) 3013 return -EFAULT; 3014 *(int *)(table->data) = msecs_to_jiffies(new); 3015 } 3016 return 1; 3017 } 3018 3019 3020 3021 #else /* CONFIG_SYSCTL_SYSCALL */ 3022 3023 3024 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args) 3025 { 3026 struct __sysctl_args tmp; 3027 int error; 3028 3029 if (copy_from_user(&tmp, args, sizeof(tmp))) 3030 return -EFAULT; 3031 3032 error = deprecated_sysctl_warning(&tmp); 3033 3034 /* If no error reading the parameters then just -ENOSYS ... */ 3035 if (!error) 3036 error = -ENOSYS; 3037 3038 return error; 3039 } 3040 3041 int sysctl_data(struct ctl_table *table, 3042 void __user *oldval, size_t __user *oldlenp, 3043 void __user *newval, size_t newlen) 3044 { 3045 return -ENOSYS; 3046 } 3047 3048 int sysctl_string(struct ctl_table *table, 3049 void __user *oldval, size_t __user *oldlenp, 3050 void __user *newval, size_t newlen) 3051 { 3052 return -ENOSYS; 3053 } 3054 3055 int sysctl_intvec(struct ctl_table *table, 3056 void __user *oldval, size_t __user *oldlenp, 3057 void __user *newval, size_t newlen) 3058 { 3059 return -ENOSYS; 3060 } 3061 3062 int sysctl_jiffies(struct ctl_table *table, 3063 void __user *oldval, size_t __user *oldlenp, 3064 void __user *newval, size_t newlen) 3065 { 3066 return -ENOSYS; 3067 } 3068 3069 int sysctl_ms_jiffies(struct ctl_table *table, 3070 void __user *oldval, size_t __user *oldlenp, 3071 void __user *newval, size_t newlen) 3072 { 3073 return -ENOSYS; 3074 } 3075 3076 #endif /* CONFIG_SYSCTL_SYSCALL */ 3077 3078 static int deprecated_sysctl_warning(struct __sysctl_args *args) 3079 { 3080 static int msg_count; 3081 int name[CTL_MAXNAME]; 3082 int i; 3083 3084 /* Check args->nlen. */ 3085 if (args->nlen < 0 || args->nlen > CTL_MAXNAME) 3086 return -ENOTDIR; 3087 3088 /* Read in the sysctl name for better debug message logging */ 3089 for (i = 0; i < args->nlen; i++) 3090 if (get_user(name[i], args->name + i)) 3091 return -EFAULT; 3092 3093 /* Ignore accesses to kernel.version */ 3094 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) 3095 return 0; 3096 3097 if (msg_count < 5) { 3098 msg_count++; 3099 printk(KERN_INFO 3100 "warning: process `%s' used the deprecated sysctl " 3101 "system call with ", current->comm); 3102 for (i = 0; i < args->nlen; i++) 3103 printk("%d.", name[i]); 3104 printk("\n"); 3105 } 3106 return 0; 3107 } 3108 3109 /* 3110 * No sense putting this after each symbol definition, twice, 3111 * exception granted :-) 3112 */ 3113 EXPORT_SYMBOL(proc_dointvec); 3114 EXPORT_SYMBOL(proc_dointvec_jiffies); 3115 EXPORT_SYMBOL(proc_dointvec_minmax); 3116 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3117 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3118 EXPORT_SYMBOL(proc_dostring); 3119 EXPORT_SYMBOL(proc_doulongvec_minmax); 3120 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3121 EXPORT_SYMBOL(register_sysctl_table); 3122 EXPORT_SYMBOL(register_sysctl_paths); 3123 EXPORT_SYMBOL(sysctl_intvec); 3124 EXPORT_SYMBOL(sysctl_jiffies); 3125 EXPORT_SYMBOL(sysctl_ms_jiffies); 3126 EXPORT_SYMBOL(sysctl_string); 3127 EXPORT_SYMBOL(sysctl_data); 3128 EXPORT_SYMBOL(unregister_sysctl_table); 3129