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