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