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