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/aio.h> 23 #include <linux/mm.h> 24 #include <linux/swap.h> 25 #include <linux/slab.h> 26 #include <linux/sysctl.h> 27 #include <linux/bitmap.h> 28 #include <linux/signal.h> 29 #include <linux/printk.h> 30 #include <linux/proc_fs.h> 31 #include <linux/security.h> 32 #include <linux/ctype.h> 33 #include <linux/kmemleak.h> 34 #include <linux/fs.h> 35 #include <linux/init.h> 36 #include <linux/kernel.h> 37 #include <linux/kobject.h> 38 #include <linux/net.h> 39 #include <linux/sysrq.h> 40 #include <linux/highuid.h> 41 #include <linux/writeback.h> 42 #include <linux/ratelimit.h> 43 #include <linux/compaction.h> 44 #include <linux/hugetlb.h> 45 #include <linux/initrd.h> 46 #include <linux/key.h> 47 #include <linux/times.h> 48 #include <linux/limits.h> 49 #include <linux/dcache.h> 50 #include <linux/dnotify.h> 51 #include <linux/syscalls.h> 52 #include <linux/vmstat.h> 53 #include <linux/nfs_fs.h> 54 #include <linux/acpi.h> 55 #include <linux/reboot.h> 56 #include <linux/ftrace.h> 57 #include <linux/perf_event.h> 58 #include <linux/kprobes.h> 59 #include <linux/pipe_fs_i.h> 60 #include <linux/oom.h> 61 #include <linux/kmod.h> 62 #include <linux/capability.h> 63 #include <linux/binfmts.h> 64 #include <linux/sched/sysctl.h> 65 #include <linux/sched/coredump.h> 66 #include <linux/kexec.h> 67 #include <linux/bpf.h> 68 #include <linux/mount.h> 69 #include <linux/pipe_fs_i.h> 70 71 #include <linux/uaccess.h> 72 #include <asm/processor.h> 73 74 #ifdef CONFIG_X86 75 #include <asm/nmi.h> 76 #include <asm/stacktrace.h> 77 #include <asm/io.h> 78 #endif 79 #ifdef CONFIG_SPARC 80 #include <asm/setup.h> 81 #endif 82 #ifdef CONFIG_BSD_PROCESS_ACCT 83 #include <linux/acct.h> 84 #endif 85 #ifdef CONFIG_RT_MUTEXES 86 #include <linux/rtmutex.h> 87 #endif 88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 89 #include <linux/lockdep.h> 90 #endif 91 #ifdef CONFIG_CHR_DEV_SG 92 #include <scsi/sg.h> 93 #endif 94 95 #ifdef CONFIG_LOCKUP_DETECTOR 96 #include <linux/nmi.h> 97 #endif 98 99 #if defined(CONFIG_SYSCTL) 100 101 /* External variables not in a header file. */ 102 extern int suid_dumpable; 103 #ifdef CONFIG_COREDUMP 104 extern int core_uses_pid; 105 extern char core_pattern[]; 106 extern unsigned int core_pipe_limit; 107 #endif 108 extern int pid_max; 109 extern int pid_max_min, pid_max_max; 110 extern int percpu_pagelist_fraction; 111 extern int latencytop_enabled; 112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; 113 #ifndef CONFIG_MMU 114 extern int sysctl_nr_trim_pages; 115 #endif 116 117 /* Constants used for minimum and maximum */ 118 #ifdef CONFIG_LOCKUP_DETECTOR 119 static int sixty = 60; 120 #endif 121 122 static int __maybe_unused neg_one = -1; 123 124 static int zero; 125 static int __maybe_unused one = 1; 126 static int __maybe_unused two = 2; 127 static int __maybe_unused four = 4; 128 static unsigned long one_ul = 1; 129 static int one_hundred = 100; 130 static int one_thousand = 1000; 131 #ifdef CONFIG_PRINTK 132 static int ten_thousand = 10000; 133 #endif 134 #ifdef CONFIG_PERF_EVENTS 135 static int six_hundred_forty_kb = 640 * 1024; 136 #endif 137 138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 140 141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 142 static int maxolduid = 65535; 143 static int minolduid; 144 145 static int ngroups_max = NGROUPS_MAX; 146 static const int cap_last_cap = CAP_LAST_CAP; 147 148 /* 149 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs 150 * and hung_task_check_interval_secs 151 */ 152 #ifdef CONFIG_DETECT_HUNG_TASK 153 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 154 #endif 155 156 #ifdef CONFIG_INOTIFY_USER 157 #include <linux/inotify.h> 158 #endif 159 #ifdef CONFIG_SPARC 160 #endif 161 162 #ifdef __hppa__ 163 extern int pwrsw_enabled; 164 #endif 165 166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 167 extern int unaligned_enabled; 168 #endif 169 170 #ifdef CONFIG_IA64 171 extern int unaligned_dump_stack; 172 #endif 173 174 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 175 extern int no_unaligned_warning; 176 #endif 177 178 #ifdef CONFIG_PROC_SYSCTL 179 180 /** 181 * enum sysctl_writes_mode - supported sysctl write modes 182 * 183 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value 184 * to be written, and multiple writes on the same sysctl file descriptor 185 * will rewrite the sysctl value, regardless of file position. No warning 186 * is issued when the initial position is not 0. 187 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is 188 * not 0. 189 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at 190 * file position 0 and the value must be fully contained in the buffer 191 * sent to the write syscall. If dealing with strings respect the file 192 * position, but restrict this to the max length of the buffer, anything 193 * passed the max lenght will be ignored. Multiple writes will append 194 * to the buffer. 195 * 196 * These write modes control how current file position affects the behavior of 197 * updating sysctl values through the proc interface on each write. 198 */ 199 enum sysctl_writes_mode { 200 SYSCTL_WRITES_LEGACY = -1, 201 SYSCTL_WRITES_WARN = 0, 202 SYSCTL_WRITES_STRICT = 1, 203 }; 204 205 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; 206 207 static int proc_do_cad_pid(struct ctl_table *table, int write, 208 void __user *buffer, size_t *lenp, loff_t *ppos); 209 static int proc_taint(struct ctl_table *table, int write, 210 void __user *buffer, size_t *lenp, loff_t *ppos); 211 #endif 212 213 #ifdef CONFIG_PRINTK 214 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 215 void __user *buffer, size_t *lenp, loff_t *ppos); 216 #endif 217 218 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 219 void __user *buffer, size_t *lenp, loff_t *ppos); 220 #ifdef CONFIG_COREDUMP 221 static int proc_dostring_coredump(struct ctl_table *table, int write, 222 void __user *buffer, size_t *lenp, loff_t *ppos); 223 #endif 224 static int proc_dopipe_max_size(struct ctl_table *table, int write, 225 void __user *buffer, size_t *lenp, loff_t *ppos); 226 227 #ifdef CONFIG_MAGIC_SYSRQ 228 /* Note: sysrq code uses its own private copy */ 229 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 230 231 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 232 void __user *buffer, size_t *lenp, 233 loff_t *ppos) 234 { 235 int error; 236 237 error = proc_dointvec(table, write, buffer, lenp, ppos); 238 if (error) 239 return error; 240 241 if (write) 242 sysrq_toggle_support(__sysrq_enabled); 243 244 return 0; 245 } 246 247 #endif 248 249 static struct ctl_table kern_table[]; 250 static struct ctl_table vm_table[]; 251 static struct ctl_table fs_table[]; 252 static struct ctl_table debug_table[]; 253 static struct ctl_table dev_table[]; 254 extern struct ctl_table random_table[]; 255 #ifdef CONFIG_EPOLL 256 extern struct ctl_table epoll_table[]; 257 #endif 258 259 #ifdef CONFIG_FW_LOADER_USER_HELPER 260 extern struct ctl_table firmware_config_table[]; 261 #endif 262 263 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 264 int sysctl_legacy_va_layout; 265 #endif 266 267 /* The default sysctl tables: */ 268 269 static struct ctl_table sysctl_base_table[] = { 270 { 271 .procname = "kernel", 272 .mode = 0555, 273 .child = kern_table, 274 }, 275 { 276 .procname = "vm", 277 .mode = 0555, 278 .child = vm_table, 279 }, 280 { 281 .procname = "fs", 282 .mode = 0555, 283 .child = fs_table, 284 }, 285 { 286 .procname = "debug", 287 .mode = 0555, 288 .child = debug_table, 289 }, 290 { 291 .procname = "dev", 292 .mode = 0555, 293 .child = dev_table, 294 }, 295 { } 296 }; 297 298 #ifdef CONFIG_SCHED_DEBUG 299 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 300 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 301 static int min_wakeup_granularity_ns; /* 0 usecs */ 302 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 303 #ifdef CONFIG_SMP 304 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 305 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 306 #endif /* CONFIG_SMP */ 307 #endif /* CONFIG_SCHED_DEBUG */ 308 309 #ifdef CONFIG_COMPACTION 310 static int min_extfrag_threshold; 311 static int max_extfrag_threshold = 1000; 312 #endif 313 314 static struct ctl_table kern_table[] = { 315 { 316 .procname = "sched_child_runs_first", 317 .data = &sysctl_sched_child_runs_first, 318 .maxlen = sizeof(unsigned int), 319 .mode = 0644, 320 .proc_handler = proc_dointvec, 321 }, 322 #ifdef CONFIG_SCHED_DEBUG 323 { 324 .procname = "sched_min_granularity_ns", 325 .data = &sysctl_sched_min_granularity, 326 .maxlen = sizeof(unsigned int), 327 .mode = 0644, 328 .proc_handler = sched_proc_update_handler, 329 .extra1 = &min_sched_granularity_ns, 330 .extra2 = &max_sched_granularity_ns, 331 }, 332 { 333 .procname = "sched_latency_ns", 334 .data = &sysctl_sched_latency, 335 .maxlen = sizeof(unsigned int), 336 .mode = 0644, 337 .proc_handler = sched_proc_update_handler, 338 .extra1 = &min_sched_granularity_ns, 339 .extra2 = &max_sched_granularity_ns, 340 }, 341 { 342 .procname = "sched_wakeup_granularity_ns", 343 .data = &sysctl_sched_wakeup_granularity, 344 .maxlen = sizeof(unsigned int), 345 .mode = 0644, 346 .proc_handler = sched_proc_update_handler, 347 .extra1 = &min_wakeup_granularity_ns, 348 .extra2 = &max_wakeup_granularity_ns, 349 }, 350 #ifdef CONFIG_SMP 351 { 352 .procname = "sched_tunable_scaling", 353 .data = &sysctl_sched_tunable_scaling, 354 .maxlen = sizeof(enum sched_tunable_scaling), 355 .mode = 0644, 356 .proc_handler = sched_proc_update_handler, 357 .extra1 = &min_sched_tunable_scaling, 358 .extra2 = &max_sched_tunable_scaling, 359 }, 360 { 361 .procname = "sched_migration_cost_ns", 362 .data = &sysctl_sched_migration_cost, 363 .maxlen = sizeof(unsigned int), 364 .mode = 0644, 365 .proc_handler = proc_dointvec, 366 }, 367 { 368 .procname = "sched_nr_migrate", 369 .data = &sysctl_sched_nr_migrate, 370 .maxlen = sizeof(unsigned int), 371 .mode = 0644, 372 .proc_handler = proc_dointvec, 373 }, 374 #ifdef CONFIG_SCHEDSTATS 375 { 376 .procname = "sched_schedstats", 377 .data = NULL, 378 .maxlen = sizeof(unsigned int), 379 .mode = 0644, 380 .proc_handler = sysctl_schedstats, 381 .extra1 = &zero, 382 .extra2 = &one, 383 }, 384 #endif /* CONFIG_SCHEDSTATS */ 385 #endif /* CONFIG_SMP */ 386 #ifdef CONFIG_NUMA_BALANCING 387 { 388 .procname = "numa_balancing_scan_delay_ms", 389 .data = &sysctl_numa_balancing_scan_delay, 390 .maxlen = sizeof(unsigned int), 391 .mode = 0644, 392 .proc_handler = proc_dointvec, 393 }, 394 { 395 .procname = "numa_balancing_scan_period_min_ms", 396 .data = &sysctl_numa_balancing_scan_period_min, 397 .maxlen = sizeof(unsigned int), 398 .mode = 0644, 399 .proc_handler = proc_dointvec, 400 }, 401 { 402 .procname = "numa_balancing_scan_period_max_ms", 403 .data = &sysctl_numa_balancing_scan_period_max, 404 .maxlen = sizeof(unsigned int), 405 .mode = 0644, 406 .proc_handler = proc_dointvec, 407 }, 408 { 409 .procname = "numa_balancing_scan_size_mb", 410 .data = &sysctl_numa_balancing_scan_size, 411 .maxlen = sizeof(unsigned int), 412 .mode = 0644, 413 .proc_handler = proc_dointvec_minmax, 414 .extra1 = &one, 415 }, 416 { 417 .procname = "numa_balancing", 418 .data = NULL, /* filled in by handler */ 419 .maxlen = sizeof(unsigned int), 420 .mode = 0644, 421 .proc_handler = sysctl_numa_balancing, 422 .extra1 = &zero, 423 .extra2 = &one, 424 }, 425 #endif /* CONFIG_NUMA_BALANCING */ 426 #endif /* CONFIG_SCHED_DEBUG */ 427 { 428 .procname = "sched_rt_period_us", 429 .data = &sysctl_sched_rt_period, 430 .maxlen = sizeof(unsigned int), 431 .mode = 0644, 432 .proc_handler = sched_rt_handler, 433 }, 434 { 435 .procname = "sched_rt_runtime_us", 436 .data = &sysctl_sched_rt_runtime, 437 .maxlen = sizeof(int), 438 .mode = 0644, 439 .proc_handler = sched_rt_handler, 440 }, 441 { 442 .procname = "sched_rr_timeslice_ms", 443 .data = &sysctl_sched_rr_timeslice, 444 .maxlen = sizeof(int), 445 .mode = 0644, 446 .proc_handler = sched_rr_handler, 447 }, 448 #ifdef CONFIG_SCHED_AUTOGROUP 449 { 450 .procname = "sched_autogroup_enabled", 451 .data = &sysctl_sched_autogroup_enabled, 452 .maxlen = sizeof(unsigned int), 453 .mode = 0644, 454 .proc_handler = proc_dointvec_minmax, 455 .extra1 = &zero, 456 .extra2 = &one, 457 }, 458 #endif 459 #ifdef CONFIG_CFS_BANDWIDTH 460 { 461 .procname = "sched_cfs_bandwidth_slice_us", 462 .data = &sysctl_sched_cfs_bandwidth_slice, 463 .maxlen = sizeof(unsigned int), 464 .mode = 0644, 465 .proc_handler = proc_dointvec_minmax, 466 .extra1 = &one, 467 }, 468 #endif 469 #ifdef CONFIG_PROVE_LOCKING 470 { 471 .procname = "prove_locking", 472 .data = &prove_locking, 473 .maxlen = sizeof(int), 474 .mode = 0644, 475 .proc_handler = proc_dointvec, 476 }, 477 #endif 478 #ifdef CONFIG_LOCK_STAT 479 { 480 .procname = "lock_stat", 481 .data = &lock_stat, 482 .maxlen = sizeof(int), 483 .mode = 0644, 484 .proc_handler = proc_dointvec, 485 }, 486 #endif 487 { 488 .procname = "panic", 489 .data = &panic_timeout, 490 .maxlen = sizeof(int), 491 .mode = 0644, 492 .proc_handler = proc_dointvec, 493 }, 494 #ifdef CONFIG_COREDUMP 495 { 496 .procname = "core_uses_pid", 497 .data = &core_uses_pid, 498 .maxlen = sizeof(int), 499 .mode = 0644, 500 .proc_handler = proc_dointvec, 501 }, 502 { 503 .procname = "core_pattern", 504 .data = core_pattern, 505 .maxlen = CORENAME_MAX_SIZE, 506 .mode = 0644, 507 .proc_handler = proc_dostring_coredump, 508 }, 509 { 510 .procname = "core_pipe_limit", 511 .data = &core_pipe_limit, 512 .maxlen = sizeof(unsigned int), 513 .mode = 0644, 514 .proc_handler = proc_dointvec, 515 }, 516 #endif 517 #ifdef CONFIG_PROC_SYSCTL 518 { 519 .procname = "tainted", 520 .maxlen = sizeof(long), 521 .mode = 0644, 522 .proc_handler = proc_taint, 523 }, 524 { 525 .procname = "sysctl_writes_strict", 526 .data = &sysctl_writes_strict, 527 .maxlen = sizeof(int), 528 .mode = 0644, 529 .proc_handler = proc_dointvec_minmax, 530 .extra1 = &neg_one, 531 .extra2 = &one, 532 }, 533 #endif 534 #ifdef CONFIG_LATENCYTOP 535 { 536 .procname = "latencytop", 537 .data = &latencytop_enabled, 538 .maxlen = sizeof(int), 539 .mode = 0644, 540 .proc_handler = sysctl_latencytop, 541 }, 542 #endif 543 #ifdef CONFIG_BLK_DEV_INITRD 544 { 545 .procname = "real-root-dev", 546 .data = &real_root_dev, 547 .maxlen = sizeof(int), 548 .mode = 0644, 549 .proc_handler = proc_dointvec, 550 }, 551 #endif 552 { 553 .procname = "print-fatal-signals", 554 .data = &print_fatal_signals, 555 .maxlen = sizeof(int), 556 .mode = 0644, 557 .proc_handler = proc_dointvec, 558 }, 559 #ifdef CONFIG_SPARC 560 { 561 .procname = "reboot-cmd", 562 .data = reboot_command, 563 .maxlen = 256, 564 .mode = 0644, 565 .proc_handler = proc_dostring, 566 }, 567 { 568 .procname = "stop-a", 569 .data = &stop_a_enabled, 570 .maxlen = sizeof (int), 571 .mode = 0644, 572 .proc_handler = proc_dointvec, 573 }, 574 { 575 .procname = "scons-poweroff", 576 .data = &scons_pwroff, 577 .maxlen = sizeof (int), 578 .mode = 0644, 579 .proc_handler = proc_dointvec, 580 }, 581 #endif 582 #ifdef CONFIG_SPARC64 583 { 584 .procname = "tsb-ratio", 585 .data = &sysctl_tsb_ratio, 586 .maxlen = sizeof (int), 587 .mode = 0644, 588 .proc_handler = proc_dointvec, 589 }, 590 #endif 591 #ifdef __hppa__ 592 { 593 .procname = "soft-power", 594 .data = &pwrsw_enabled, 595 .maxlen = sizeof (int), 596 .mode = 0644, 597 .proc_handler = proc_dointvec, 598 }, 599 #endif 600 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 601 { 602 .procname = "unaligned-trap", 603 .data = &unaligned_enabled, 604 .maxlen = sizeof (int), 605 .mode = 0644, 606 .proc_handler = proc_dointvec, 607 }, 608 #endif 609 { 610 .procname = "ctrl-alt-del", 611 .data = &C_A_D, 612 .maxlen = sizeof(int), 613 .mode = 0644, 614 .proc_handler = proc_dointvec, 615 }, 616 #ifdef CONFIG_FUNCTION_TRACER 617 { 618 .procname = "ftrace_enabled", 619 .data = &ftrace_enabled, 620 .maxlen = sizeof(int), 621 .mode = 0644, 622 .proc_handler = ftrace_enable_sysctl, 623 }, 624 #endif 625 #ifdef CONFIG_STACK_TRACER 626 { 627 .procname = "stack_tracer_enabled", 628 .data = &stack_tracer_enabled, 629 .maxlen = sizeof(int), 630 .mode = 0644, 631 .proc_handler = stack_trace_sysctl, 632 }, 633 #endif 634 #ifdef CONFIG_TRACING 635 { 636 .procname = "ftrace_dump_on_oops", 637 .data = &ftrace_dump_on_oops, 638 .maxlen = sizeof(int), 639 .mode = 0644, 640 .proc_handler = proc_dointvec, 641 }, 642 { 643 .procname = "traceoff_on_warning", 644 .data = &__disable_trace_on_warning, 645 .maxlen = sizeof(__disable_trace_on_warning), 646 .mode = 0644, 647 .proc_handler = proc_dointvec, 648 }, 649 { 650 .procname = "tracepoint_printk", 651 .data = &tracepoint_printk, 652 .maxlen = sizeof(tracepoint_printk), 653 .mode = 0644, 654 .proc_handler = tracepoint_printk_sysctl, 655 }, 656 #endif 657 #ifdef CONFIG_KEXEC_CORE 658 { 659 .procname = "kexec_load_disabled", 660 .data = &kexec_load_disabled, 661 .maxlen = sizeof(int), 662 .mode = 0644, 663 /* only handle a transition from default "0" to "1" */ 664 .proc_handler = proc_dointvec_minmax, 665 .extra1 = &one, 666 .extra2 = &one, 667 }, 668 #endif 669 #ifdef CONFIG_MODULES 670 { 671 .procname = "modprobe", 672 .data = &modprobe_path, 673 .maxlen = KMOD_PATH_LEN, 674 .mode = 0644, 675 .proc_handler = proc_dostring, 676 }, 677 { 678 .procname = "modules_disabled", 679 .data = &modules_disabled, 680 .maxlen = sizeof(int), 681 .mode = 0644, 682 /* only handle a transition from default "0" to "1" */ 683 .proc_handler = proc_dointvec_minmax, 684 .extra1 = &one, 685 .extra2 = &one, 686 }, 687 #endif 688 #ifdef CONFIG_UEVENT_HELPER 689 { 690 .procname = "hotplug", 691 .data = &uevent_helper, 692 .maxlen = UEVENT_HELPER_PATH_LEN, 693 .mode = 0644, 694 .proc_handler = proc_dostring, 695 }, 696 #endif 697 #ifdef CONFIG_CHR_DEV_SG 698 { 699 .procname = "sg-big-buff", 700 .data = &sg_big_buff, 701 .maxlen = sizeof (int), 702 .mode = 0444, 703 .proc_handler = proc_dointvec, 704 }, 705 #endif 706 #ifdef CONFIG_BSD_PROCESS_ACCT 707 { 708 .procname = "acct", 709 .data = &acct_parm, 710 .maxlen = 3*sizeof(int), 711 .mode = 0644, 712 .proc_handler = proc_dointvec, 713 }, 714 #endif 715 #ifdef CONFIG_MAGIC_SYSRQ 716 { 717 .procname = "sysrq", 718 .data = &__sysrq_enabled, 719 .maxlen = sizeof (int), 720 .mode = 0644, 721 .proc_handler = sysrq_sysctl_handler, 722 }, 723 #endif 724 #ifdef CONFIG_PROC_SYSCTL 725 { 726 .procname = "cad_pid", 727 .data = NULL, 728 .maxlen = sizeof (int), 729 .mode = 0600, 730 .proc_handler = proc_do_cad_pid, 731 }, 732 #endif 733 { 734 .procname = "threads-max", 735 .data = NULL, 736 .maxlen = sizeof(int), 737 .mode = 0644, 738 .proc_handler = sysctl_max_threads, 739 }, 740 { 741 .procname = "random", 742 .mode = 0555, 743 .child = random_table, 744 }, 745 { 746 .procname = "usermodehelper", 747 .mode = 0555, 748 .child = usermodehelper_table, 749 }, 750 #ifdef CONFIG_FW_LOADER_USER_HELPER 751 { 752 .procname = "firmware_config", 753 .mode = 0555, 754 .child = firmware_config_table, 755 }, 756 #endif 757 { 758 .procname = "overflowuid", 759 .data = &overflowuid, 760 .maxlen = sizeof(int), 761 .mode = 0644, 762 .proc_handler = proc_dointvec_minmax, 763 .extra1 = &minolduid, 764 .extra2 = &maxolduid, 765 }, 766 { 767 .procname = "overflowgid", 768 .data = &overflowgid, 769 .maxlen = sizeof(int), 770 .mode = 0644, 771 .proc_handler = proc_dointvec_minmax, 772 .extra1 = &minolduid, 773 .extra2 = &maxolduid, 774 }, 775 #ifdef CONFIG_S390 776 #ifdef CONFIG_MATHEMU 777 { 778 .procname = "ieee_emulation_warnings", 779 .data = &sysctl_ieee_emulation_warnings, 780 .maxlen = sizeof(int), 781 .mode = 0644, 782 .proc_handler = proc_dointvec, 783 }, 784 #endif 785 { 786 .procname = "userprocess_debug", 787 .data = &show_unhandled_signals, 788 .maxlen = sizeof(int), 789 .mode = 0644, 790 .proc_handler = proc_dointvec, 791 }, 792 #endif 793 { 794 .procname = "pid_max", 795 .data = &pid_max, 796 .maxlen = sizeof (int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec_minmax, 799 .extra1 = &pid_max_min, 800 .extra2 = &pid_max_max, 801 }, 802 { 803 .procname = "panic_on_oops", 804 .data = &panic_on_oops, 805 .maxlen = sizeof(int), 806 .mode = 0644, 807 .proc_handler = proc_dointvec, 808 }, 809 #if defined CONFIG_PRINTK 810 { 811 .procname = "printk", 812 .data = &console_loglevel, 813 .maxlen = 4*sizeof(int), 814 .mode = 0644, 815 .proc_handler = proc_dointvec, 816 }, 817 { 818 .procname = "printk_ratelimit", 819 .data = &printk_ratelimit_state.interval, 820 .maxlen = sizeof(int), 821 .mode = 0644, 822 .proc_handler = proc_dointvec_jiffies, 823 }, 824 { 825 .procname = "printk_ratelimit_burst", 826 .data = &printk_ratelimit_state.burst, 827 .maxlen = sizeof(int), 828 .mode = 0644, 829 .proc_handler = proc_dointvec, 830 }, 831 { 832 .procname = "printk_delay", 833 .data = &printk_delay_msec, 834 .maxlen = sizeof(int), 835 .mode = 0644, 836 .proc_handler = proc_dointvec_minmax, 837 .extra1 = &zero, 838 .extra2 = &ten_thousand, 839 }, 840 { 841 .procname = "printk_devkmsg", 842 .data = devkmsg_log_str, 843 .maxlen = DEVKMSG_STR_MAX_SIZE, 844 .mode = 0644, 845 .proc_handler = devkmsg_sysctl_set_loglvl, 846 }, 847 { 848 .procname = "dmesg_restrict", 849 .data = &dmesg_restrict, 850 .maxlen = sizeof(int), 851 .mode = 0644, 852 .proc_handler = proc_dointvec_minmax_sysadmin, 853 .extra1 = &zero, 854 .extra2 = &one, 855 }, 856 { 857 .procname = "kptr_restrict", 858 .data = &kptr_restrict, 859 .maxlen = sizeof(int), 860 .mode = 0644, 861 .proc_handler = proc_dointvec_minmax_sysadmin, 862 .extra1 = &zero, 863 .extra2 = &two, 864 }, 865 #endif 866 { 867 .procname = "ngroups_max", 868 .data = &ngroups_max, 869 .maxlen = sizeof (int), 870 .mode = 0444, 871 .proc_handler = proc_dointvec, 872 }, 873 { 874 .procname = "cap_last_cap", 875 .data = (void *)&cap_last_cap, 876 .maxlen = sizeof(int), 877 .mode = 0444, 878 .proc_handler = proc_dointvec, 879 }, 880 #if defined(CONFIG_LOCKUP_DETECTOR) 881 { 882 .procname = "watchdog", 883 .data = &watchdog_user_enabled, 884 .maxlen = sizeof(int), 885 .mode = 0644, 886 .proc_handler = proc_watchdog, 887 .extra1 = &zero, 888 .extra2 = &one, 889 }, 890 { 891 .procname = "watchdog_thresh", 892 .data = &watchdog_thresh, 893 .maxlen = sizeof(int), 894 .mode = 0644, 895 .proc_handler = proc_watchdog_thresh, 896 .extra1 = &zero, 897 .extra2 = &sixty, 898 }, 899 { 900 .procname = "nmi_watchdog", 901 .data = &nmi_watchdog_user_enabled, 902 .maxlen = sizeof(int), 903 .mode = NMI_WATCHDOG_SYSCTL_PERM, 904 .proc_handler = proc_nmi_watchdog, 905 .extra1 = &zero, 906 .extra2 = &one, 907 }, 908 { 909 .procname = "watchdog_cpumask", 910 .data = &watchdog_cpumask_bits, 911 .maxlen = NR_CPUS, 912 .mode = 0644, 913 .proc_handler = proc_watchdog_cpumask, 914 }, 915 #ifdef CONFIG_SOFTLOCKUP_DETECTOR 916 { 917 .procname = "soft_watchdog", 918 .data = &soft_watchdog_user_enabled, 919 .maxlen = sizeof(int), 920 .mode = 0644, 921 .proc_handler = proc_soft_watchdog, 922 .extra1 = &zero, 923 .extra2 = &one, 924 }, 925 { 926 .procname = "softlockup_panic", 927 .data = &softlockup_panic, 928 .maxlen = sizeof(int), 929 .mode = 0644, 930 .proc_handler = proc_dointvec_minmax, 931 .extra1 = &zero, 932 .extra2 = &one, 933 }, 934 #ifdef CONFIG_SMP 935 { 936 .procname = "softlockup_all_cpu_backtrace", 937 .data = &sysctl_softlockup_all_cpu_backtrace, 938 .maxlen = sizeof(int), 939 .mode = 0644, 940 .proc_handler = proc_dointvec_minmax, 941 .extra1 = &zero, 942 .extra2 = &one, 943 }, 944 #endif /* CONFIG_SMP */ 945 #endif 946 #ifdef CONFIG_HARDLOCKUP_DETECTOR 947 { 948 .procname = "hardlockup_panic", 949 .data = &hardlockup_panic, 950 .maxlen = sizeof(int), 951 .mode = 0644, 952 .proc_handler = proc_dointvec_minmax, 953 .extra1 = &zero, 954 .extra2 = &one, 955 }, 956 #ifdef CONFIG_SMP 957 { 958 .procname = "hardlockup_all_cpu_backtrace", 959 .data = &sysctl_hardlockup_all_cpu_backtrace, 960 .maxlen = sizeof(int), 961 .mode = 0644, 962 .proc_handler = proc_dointvec_minmax, 963 .extra1 = &zero, 964 .extra2 = &one, 965 }, 966 #endif /* CONFIG_SMP */ 967 #endif 968 #endif 969 970 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 971 { 972 .procname = "unknown_nmi_panic", 973 .data = &unknown_nmi_panic, 974 .maxlen = sizeof (int), 975 .mode = 0644, 976 .proc_handler = proc_dointvec, 977 }, 978 #endif 979 #if defined(CONFIG_X86) 980 { 981 .procname = "panic_on_unrecovered_nmi", 982 .data = &panic_on_unrecovered_nmi, 983 .maxlen = sizeof(int), 984 .mode = 0644, 985 .proc_handler = proc_dointvec, 986 }, 987 { 988 .procname = "panic_on_io_nmi", 989 .data = &panic_on_io_nmi, 990 .maxlen = sizeof(int), 991 .mode = 0644, 992 .proc_handler = proc_dointvec, 993 }, 994 #ifdef CONFIG_DEBUG_STACKOVERFLOW 995 { 996 .procname = "panic_on_stackoverflow", 997 .data = &sysctl_panic_on_stackoverflow, 998 .maxlen = sizeof(int), 999 .mode = 0644, 1000 .proc_handler = proc_dointvec, 1001 }, 1002 #endif 1003 { 1004 .procname = "bootloader_type", 1005 .data = &bootloader_type, 1006 .maxlen = sizeof (int), 1007 .mode = 0444, 1008 .proc_handler = proc_dointvec, 1009 }, 1010 { 1011 .procname = "bootloader_version", 1012 .data = &bootloader_version, 1013 .maxlen = sizeof (int), 1014 .mode = 0444, 1015 .proc_handler = proc_dointvec, 1016 }, 1017 { 1018 .procname = "io_delay_type", 1019 .data = &io_delay_type, 1020 .maxlen = sizeof(int), 1021 .mode = 0644, 1022 .proc_handler = proc_dointvec, 1023 }, 1024 #endif 1025 #if defined(CONFIG_MMU) 1026 { 1027 .procname = "randomize_va_space", 1028 .data = &randomize_va_space, 1029 .maxlen = sizeof(int), 1030 .mode = 0644, 1031 .proc_handler = proc_dointvec, 1032 }, 1033 #endif 1034 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1035 { 1036 .procname = "spin_retry", 1037 .data = &spin_retry, 1038 .maxlen = sizeof (int), 1039 .mode = 0644, 1040 .proc_handler = proc_dointvec, 1041 }, 1042 #endif 1043 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1044 { 1045 .procname = "acpi_video_flags", 1046 .data = &acpi_realmode_flags, 1047 .maxlen = sizeof (unsigned long), 1048 .mode = 0644, 1049 .proc_handler = proc_doulongvec_minmax, 1050 }, 1051 #endif 1052 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1053 { 1054 .procname = "ignore-unaligned-usertrap", 1055 .data = &no_unaligned_warning, 1056 .maxlen = sizeof (int), 1057 .mode = 0644, 1058 .proc_handler = proc_dointvec, 1059 }, 1060 #endif 1061 #ifdef CONFIG_IA64 1062 { 1063 .procname = "unaligned-dump-stack", 1064 .data = &unaligned_dump_stack, 1065 .maxlen = sizeof (int), 1066 .mode = 0644, 1067 .proc_handler = proc_dointvec, 1068 }, 1069 #endif 1070 #ifdef CONFIG_DETECT_HUNG_TASK 1071 { 1072 .procname = "hung_task_panic", 1073 .data = &sysctl_hung_task_panic, 1074 .maxlen = sizeof(int), 1075 .mode = 0644, 1076 .proc_handler = proc_dointvec_minmax, 1077 .extra1 = &zero, 1078 .extra2 = &one, 1079 }, 1080 { 1081 .procname = "hung_task_check_count", 1082 .data = &sysctl_hung_task_check_count, 1083 .maxlen = sizeof(int), 1084 .mode = 0644, 1085 .proc_handler = proc_dointvec_minmax, 1086 .extra1 = &zero, 1087 }, 1088 { 1089 .procname = "hung_task_timeout_secs", 1090 .data = &sysctl_hung_task_timeout_secs, 1091 .maxlen = sizeof(unsigned long), 1092 .mode = 0644, 1093 .proc_handler = proc_dohung_task_timeout_secs, 1094 .extra2 = &hung_task_timeout_max, 1095 }, 1096 { 1097 .procname = "hung_task_check_interval_secs", 1098 .data = &sysctl_hung_task_check_interval_secs, 1099 .maxlen = sizeof(unsigned long), 1100 .mode = 0644, 1101 .proc_handler = proc_dohung_task_timeout_secs, 1102 .extra2 = &hung_task_timeout_max, 1103 }, 1104 { 1105 .procname = "hung_task_warnings", 1106 .data = &sysctl_hung_task_warnings, 1107 .maxlen = sizeof(int), 1108 .mode = 0644, 1109 .proc_handler = proc_dointvec_minmax, 1110 .extra1 = &neg_one, 1111 }, 1112 #endif 1113 #ifdef CONFIG_RT_MUTEXES 1114 { 1115 .procname = "max_lock_depth", 1116 .data = &max_lock_depth, 1117 .maxlen = sizeof(int), 1118 .mode = 0644, 1119 .proc_handler = proc_dointvec, 1120 }, 1121 #endif 1122 { 1123 .procname = "poweroff_cmd", 1124 .data = &poweroff_cmd, 1125 .maxlen = POWEROFF_CMD_PATH_LEN, 1126 .mode = 0644, 1127 .proc_handler = proc_dostring, 1128 }, 1129 #ifdef CONFIG_KEYS 1130 { 1131 .procname = "keys", 1132 .mode = 0555, 1133 .child = key_sysctls, 1134 }, 1135 #endif 1136 #ifdef CONFIG_PERF_EVENTS 1137 /* 1138 * User-space scripts rely on the existence of this file 1139 * as a feature check for perf_events being enabled. 1140 * 1141 * So it's an ABI, do not remove! 1142 */ 1143 { 1144 .procname = "perf_event_paranoid", 1145 .data = &sysctl_perf_event_paranoid, 1146 .maxlen = sizeof(sysctl_perf_event_paranoid), 1147 .mode = 0644, 1148 .proc_handler = proc_dointvec, 1149 }, 1150 { 1151 .procname = "perf_event_mlock_kb", 1152 .data = &sysctl_perf_event_mlock, 1153 .maxlen = sizeof(sysctl_perf_event_mlock), 1154 .mode = 0644, 1155 .proc_handler = proc_dointvec, 1156 }, 1157 { 1158 .procname = "perf_event_max_sample_rate", 1159 .data = &sysctl_perf_event_sample_rate, 1160 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1161 .mode = 0644, 1162 .proc_handler = perf_proc_update_handler, 1163 .extra1 = &one, 1164 }, 1165 { 1166 .procname = "perf_cpu_time_max_percent", 1167 .data = &sysctl_perf_cpu_time_max_percent, 1168 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1169 .mode = 0644, 1170 .proc_handler = perf_cpu_time_max_percent_handler, 1171 .extra1 = &zero, 1172 .extra2 = &one_hundred, 1173 }, 1174 { 1175 .procname = "perf_event_max_stack", 1176 .data = &sysctl_perf_event_max_stack, 1177 .maxlen = sizeof(sysctl_perf_event_max_stack), 1178 .mode = 0644, 1179 .proc_handler = perf_event_max_stack_handler, 1180 .extra1 = &zero, 1181 .extra2 = &six_hundred_forty_kb, 1182 }, 1183 { 1184 .procname = "perf_event_max_contexts_per_stack", 1185 .data = &sysctl_perf_event_max_contexts_per_stack, 1186 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1187 .mode = 0644, 1188 .proc_handler = perf_event_max_stack_handler, 1189 .extra1 = &zero, 1190 .extra2 = &one_thousand, 1191 }, 1192 #endif 1193 { 1194 .procname = "panic_on_warn", 1195 .data = &panic_on_warn, 1196 .maxlen = sizeof(int), 1197 .mode = 0644, 1198 .proc_handler = proc_dointvec_minmax, 1199 .extra1 = &zero, 1200 .extra2 = &one, 1201 }, 1202 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1203 { 1204 .procname = "timer_migration", 1205 .data = &sysctl_timer_migration, 1206 .maxlen = sizeof(unsigned int), 1207 .mode = 0644, 1208 .proc_handler = timer_migration_handler, 1209 .extra1 = &zero, 1210 .extra2 = &one, 1211 }, 1212 #endif 1213 #ifdef CONFIG_BPF_SYSCALL 1214 { 1215 .procname = "unprivileged_bpf_disabled", 1216 .data = &sysctl_unprivileged_bpf_disabled, 1217 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1218 .mode = 0644, 1219 /* only handle a transition from default "0" to "1" */ 1220 .proc_handler = proc_dointvec_minmax, 1221 .extra1 = &one, 1222 .extra2 = &one, 1223 }, 1224 #endif 1225 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1226 { 1227 .procname = "panic_on_rcu_stall", 1228 .data = &sysctl_panic_on_rcu_stall, 1229 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1230 .mode = 0644, 1231 .proc_handler = proc_dointvec_minmax, 1232 .extra1 = &zero, 1233 .extra2 = &one, 1234 }, 1235 #endif 1236 { } 1237 }; 1238 1239 static struct ctl_table vm_table[] = { 1240 { 1241 .procname = "overcommit_memory", 1242 .data = &sysctl_overcommit_memory, 1243 .maxlen = sizeof(sysctl_overcommit_memory), 1244 .mode = 0644, 1245 .proc_handler = proc_dointvec_minmax, 1246 .extra1 = &zero, 1247 .extra2 = &two, 1248 }, 1249 { 1250 .procname = "panic_on_oom", 1251 .data = &sysctl_panic_on_oom, 1252 .maxlen = sizeof(sysctl_panic_on_oom), 1253 .mode = 0644, 1254 .proc_handler = proc_dointvec_minmax, 1255 .extra1 = &zero, 1256 .extra2 = &two, 1257 }, 1258 { 1259 .procname = "oom_kill_allocating_task", 1260 .data = &sysctl_oom_kill_allocating_task, 1261 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1262 .mode = 0644, 1263 .proc_handler = proc_dointvec, 1264 }, 1265 { 1266 .procname = "oom_dump_tasks", 1267 .data = &sysctl_oom_dump_tasks, 1268 .maxlen = sizeof(sysctl_oom_dump_tasks), 1269 .mode = 0644, 1270 .proc_handler = proc_dointvec, 1271 }, 1272 { 1273 .procname = "overcommit_ratio", 1274 .data = &sysctl_overcommit_ratio, 1275 .maxlen = sizeof(sysctl_overcommit_ratio), 1276 .mode = 0644, 1277 .proc_handler = overcommit_ratio_handler, 1278 }, 1279 { 1280 .procname = "overcommit_kbytes", 1281 .data = &sysctl_overcommit_kbytes, 1282 .maxlen = sizeof(sysctl_overcommit_kbytes), 1283 .mode = 0644, 1284 .proc_handler = overcommit_kbytes_handler, 1285 }, 1286 { 1287 .procname = "page-cluster", 1288 .data = &page_cluster, 1289 .maxlen = sizeof(int), 1290 .mode = 0644, 1291 .proc_handler = proc_dointvec_minmax, 1292 .extra1 = &zero, 1293 }, 1294 { 1295 .procname = "dirty_background_ratio", 1296 .data = &dirty_background_ratio, 1297 .maxlen = sizeof(dirty_background_ratio), 1298 .mode = 0644, 1299 .proc_handler = dirty_background_ratio_handler, 1300 .extra1 = &zero, 1301 .extra2 = &one_hundred, 1302 }, 1303 { 1304 .procname = "dirty_background_bytes", 1305 .data = &dirty_background_bytes, 1306 .maxlen = sizeof(dirty_background_bytes), 1307 .mode = 0644, 1308 .proc_handler = dirty_background_bytes_handler, 1309 .extra1 = &one_ul, 1310 }, 1311 { 1312 .procname = "dirty_ratio", 1313 .data = &vm_dirty_ratio, 1314 .maxlen = sizeof(vm_dirty_ratio), 1315 .mode = 0644, 1316 .proc_handler = dirty_ratio_handler, 1317 .extra1 = &zero, 1318 .extra2 = &one_hundred, 1319 }, 1320 { 1321 .procname = "dirty_bytes", 1322 .data = &vm_dirty_bytes, 1323 .maxlen = sizeof(vm_dirty_bytes), 1324 .mode = 0644, 1325 .proc_handler = dirty_bytes_handler, 1326 .extra1 = &dirty_bytes_min, 1327 }, 1328 { 1329 .procname = "dirty_writeback_centisecs", 1330 .data = &dirty_writeback_interval, 1331 .maxlen = sizeof(dirty_writeback_interval), 1332 .mode = 0644, 1333 .proc_handler = dirty_writeback_centisecs_handler, 1334 }, 1335 { 1336 .procname = "dirty_expire_centisecs", 1337 .data = &dirty_expire_interval, 1338 .maxlen = sizeof(dirty_expire_interval), 1339 .mode = 0644, 1340 .proc_handler = proc_dointvec_minmax, 1341 .extra1 = &zero, 1342 }, 1343 { 1344 .procname = "dirtytime_expire_seconds", 1345 .data = &dirtytime_expire_interval, 1346 .maxlen = sizeof(dirtytime_expire_interval), 1347 .mode = 0644, 1348 .proc_handler = dirtytime_interval_handler, 1349 .extra1 = &zero, 1350 }, 1351 { 1352 .procname = "swappiness", 1353 .data = &vm_swappiness, 1354 .maxlen = sizeof(vm_swappiness), 1355 .mode = 0644, 1356 .proc_handler = proc_dointvec_minmax, 1357 .extra1 = &zero, 1358 .extra2 = &one_hundred, 1359 }, 1360 #ifdef CONFIG_HUGETLB_PAGE 1361 { 1362 .procname = "nr_hugepages", 1363 .data = NULL, 1364 .maxlen = sizeof(unsigned long), 1365 .mode = 0644, 1366 .proc_handler = hugetlb_sysctl_handler, 1367 }, 1368 #ifdef CONFIG_NUMA 1369 { 1370 .procname = "nr_hugepages_mempolicy", 1371 .data = NULL, 1372 .maxlen = sizeof(unsigned long), 1373 .mode = 0644, 1374 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1375 }, 1376 { 1377 .procname = "numa_stat", 1378 .data = &sysctl_vm_numa_stat, 1379 .maxlen = sizeof(int), 1380 .mode = 0644, 1381 .proc_handler = sysctl_vm_numa_stat_handler, 1382 .extra1 = &zero, 1383 .extra2 = &one, 1384 }, 1385 #endif 1386 { 1387 .procname = "hugetlb_shm_group", 1388 .data = &sysctl_hugetlb_shm_group, 1389 .maxlen = sizeof(gid_t), 1390 .mode = 0644, 1391 .proc_handler = proc_dointvec, 1392 }, 1393 { 1394 .procname = "nr_overcommit_hugepages", 1395 .data = NULL, 1396 .maxlen = sizeof(unsigned long), 1397 .mode = 0644, 1398 .proc_handler = hugetlb_overcommit_handler, 1399 }, 1400 #endif 1401 { 1402 .procname = "lowmem_reserve_ratio", 1403 .data = &sysctl_lowmem_reserve_ratio, 1404 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1405 .mode = 0644, 1406 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1407 }, 1408 { 1409 .procname = "drop_caches", 1410 .data = &sysctl_drop_caches, 1411 .maxlen = sizeof(int), 1412 .mode = 0644, 1413 .proc_handler = drop_caches_sysctl_handler, 1414 .extra1 = &one, 1415 .extra2 = &four, 1416 }, 1417 #ifdef CONFIG_COMPACTION 1418 { 1419 .procname = "compact_memory", 1420 .data = &sysctl_compact_memory, 1421 .maxlen = sizeof(int), 1422 .mode = 0200, 1423 .proc_handler = sysctl_compaction_handler, 1424 }, 1425 { 1426 .procname = "extfrag_threshold", 1427 .data = &sysctl_extfrag_threshold, 1428 .maxlen = sizeof(int), 1429 .mode = 0644, 1430 .proc_handler = sysctl_extfrag_handler, 1431 .extra1 = &min_extfrag_threshold, 1432 .extra2 = &max_extfrag_threshold, 1433 }, 1434 { 1435 .procname = "compact_unevictable_allowed", 1436 .data = &sysctl_compact_unevictable_allowed, 1437 .maxlen = sizeof(int), 1438 .mode = 0644, 1439 .proc_handler = proc_dointvec, 1440 .extra1 = &zero, 1441 .extra2 = &one, 1442 }, 1443 1444 #endif /* CONFIG_COMPACTION */ 1445 { 1446 .procname = "min_free_kbytes", 1447 .data = &min_free_kbytes, 1448 .maxlen = sizeof(min_free_kbytes), 1449 .mode = 0644, 1450 .proc_handler = min_free_kbytes_sysctl_handler, 1451 .extra1 = &zero, 1452 }, 1453 { 1454 .procname = "watermark_scale_factor", 1455 .data = &watermark_scale_factor, 1456 .maxlen = sizeof(watermark_scale_factor), 1457 .mode = 0644, 1458 .proc_handler = watermark_scale_factor_sysctl_handler, 1459 .extra1 = &one, 1460 .extra2 = &one_thousand, 1461 }, 1462 { 1463 .procname = "percpu_pagelist_fraction", 1464 .data = &percpu_pagelist_fraction, 1465 .maxlen = sizeof(percpu_pagelist_fraction), 1466 .mode = 0644, 1467 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1468 .extra1 = &zero, 1469 }, 1470 #ifdef CONFIG_MMU 1471 { 1472 .procname = "max_map_count", 1473 .data = &sysctl_max_map_count, 1474 .maxlen = sizeof(sysctl_max_map_count), 1475 .mode = 0644, 1476 .proc_handler = proc_dointvec_minmax, 1477 .extra1 = &zero, 1478 }, 1479 #else 1480 { 1481 .procname = "nr_trim_pages", 1482 .data = &sysctl_nr_trim_pages, 1483 .maxlen = sizeof(sysctl_nr_trim_pages), 1484 .mode = 0644, 1485 .proc_handler = proc_dointvec_minmax, 1486 .extra1 = &zero, 1487 }, 1488 #endif 1489 { 1490 .procname = "laptop_mode", 1491 .data = &laptop_mode, 1492 .maxlen = sizeof(laptop_mode), 1493 .mode = 0644, 1494 .proc_handler = proc_dointvec_jiffies, 1495 }, 1496 { 1497 .procname = "block_dump", 1498 .data = &block_dump, 1499 .maxlen = sizeof(block_dump), 1500 .mode = 0644, 1501 .proc_handler = proc_dointvec, 1502 .extra1 = &zero, 1503 }, 1504 { 1505 .procname = "vfs_cache_pressure", 1506 .data = &sysctl_vfs_cache_pressure, 1507 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1508 .mode = 0644, 1509 .proc_handler = proc_dointvec, 1510 .extra1 = &zero, 1511 }, 1512 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1513 { 1514 .procname = "legacy_va_layout", 1515 .data = &sysctl_legacy_va_layout, 1516 .maxlen = sizeof(sysctl_legacy_va_layout), 1517 .mode = 0644, 1518 .proc_handler = proc_dointvec, 1519 .extra1 = &zero, 1520 }, 1521 #endif 1522 #ifdef CONFIG_NUMA 1523 { 1524 .procname = "zone_reclaim_mode", 1525 .data = &node_reclaim_mode, 1526 .maxlen = sizeof(node_reclaim_mode), 1527 .mode = 0644, 1528 .proc_handler = proc_dointvec, 1529 .extra1 = &zero, 1530 }, 1531 { 1532 .procname = "min_unmapped_ratio", 1533 .data = &sysctl_min_unmapped_ratio, 1534 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1535 .mode = 0644, 1536 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1537 .extra1 = &zero, 1538 .extra2 = &one_hundred, 1539 }, 1540 { 1541 .procname = "min_slab_ratio", 1542 .data = &sysctl_min_slab_ratio, 1543 .maxlen = sizeof(sysctl_min_slab_ratio), 1544 .mode = 0644, 1545 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1546 .extra1 = &zero, 1547 .extra2 = &one_hundred, 1548 }, 1549 #endif 1550 #ifdef CONFIG_SMP 1551 { 1552 .procname = "stat_interval", 1553 .data = &sysctl_stat_interval, 1554 .maxlen = sizeof(sysctl_stat_interval), 1555 .mode = 0644, 1556 .proc_handler = proc_dointvec_jiffies, 1557 }, 1558 { 1559 .procname = "stat_refresh", 1560 .data = NULL, 1561 .maxlen = 0, 1562 .mode = 0600, 1563 .proc_handler = vmstat_refresh, 1564 }, 1565 #endif 1566 #ifdef CONFIG_MMU 1567 { 1568 .procname = "mmap_min_addr", 1569 .data = &dac_mmap_min_addr, 1570 .maxlen = sizeof(unsigned long), 1571 .mode = 0644, 1572 .proc_handler = mmap_min_addr_handler, 1573 }, 1574 #endif 1575 #ifdef CONFIG_NUMA 1576 { 1577 .procname = "numa_zonelist_order", 1578 .data = &numa_zonelist_order, 1579 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1580 .mode = 0644, 1581 .proc_handler = numa_zonelist_order_handler, 1582 }, 1583 #endif 1584 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1585 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1586 { 1587 .procname = "vdso_enabled", 1588 #ifdef CONFIG_X86_32 1589 .data = &vdso32_enabled, 1590 .maxlen = sizeof(vdso32_enabled), 1591 #else 1592 .data = &vdso_enabled, 1593 .maxlen = sizeof(vdso_enabled), 1594 #endif 1595 .mode = 0644, 1596 .proc_handler = proc_dointvec, 1597 .extra1 = &zero, 1598 }, 1599 #endif 1600 #ifdef CONFIG_HIGHMEM 1601 { 1602 .procname = "highmem_is_dirtyable", 1603 .data = &vm_highmem_is_dirtyable, 1604 .maxlen = sizeof(vm_highmem_is_dirtyable), 1605 .mode = 0644, 1606 .proc_handler = proc_dointvec_minmax, 1607 .extra1 = &zero, 1608 .extra2 = &one, 1609 }, 1610 #endif 1611 #ifdef CONFIG_MEMORY_FAILURE 1612 { 1613 .procname = "memory_failure_early_kill", 1614 .data = &sysctl_memory_failure_early_kill, 1615 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1616 .mode = 0644, 1617 .proc_handler = proc_dointvec_minmax, 1618 .extra1 = &zero, 1619 .extra2 = &one, 1620 }, 1621 { 1622 .procname = "memory_failure_recovery", 1623 .data = &sysctl_memory_failure_recovery, 1624 .maxlen = sizeof(sysctl_memory_failure_recovery), 1625 .mode = 0644, 1626 .proc_handler = proc_dointvec_minmax, 1627 .extra1 = &zero, 1628 .extra2 = &one, 1629 }, 1630 #endif 1631 { 1632 .procname = "user_reserve_kbytes", 1633 .data = &sysctl_user_reserve_kbytes, 1634 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1635 .mode = 0644, 1636 .proc_handler = proc_doulongvec_minmax, 1637 }, 1638 { 1639 .procname = "admin_reserve_kbytes", 1640 .data = &sysctl_admin_reserve_kbytes, 1641 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1642 .mode = 0644, 1643 .proc_handler = proc_doulongvec_minmax, 1644 }, 1645 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1646 { 1647 .procname = "mmap_rnd_bits", 1648 .data = &mmap_rnd_bits, 1649 .maxlen = sizeof(mmap_rnd_bits), 1650 .mode = 0600, 1651 .proc_handler = proc_dointvec_minmax, 1652 .extra1 = (void *)&mmap_rnd_bits_min, 1653 .extra2 = (void *)&mmap_rnd_bits_max, 1654 }, 1655 #endif 1656 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1657 { 1658 .procname = "mmap_rnd_compat_bits", 1659 .data = &mmap_rnd_compat_bits, 1660 .maxlen = sizeof(mmap_rnd_compat_bits), 1661 .mode = 0600, 1662 .proc_handler = proc_dointvec_minmax, 1663 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1664 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1665 }, 1666 #endif 1667 { } 1668 }; 1669 1670 static struct ctl_table fs_table[] = { 1671 { 1672 .procname = "inode-nr", 1673 .data = &inodes_stat, 1674 .maxlen = 2*sizeof(long), 1675 .mode = 0444, 1676 .proc_handler = proc_nr_inodes, 1677 }, 1678 { 1679 .procname = "inode-state", 1680 .data = &inodes_stat, 1681 .maxlen = 7*sizeof(long), 1682 .mode = 0444, 1683 .proc_handler = proc_nr_inodes, 1684 }, 1685 { 1686 .procname = "file-nr", 1687 .data = &files_stat, 1688 .maxlen = sizeof(files_stat), 1689 .mode = 0444, 1690 .proc_handler = proc_nr_files, 1691 }, 1692 { 1693 .procname = "file-max", 1694 .data = &files_stat.max_files, 1695 .maxlen = sizeof(files_stat.max_files), 1696 .mode = 0644, 1697 .proc_handler = proc_doulongvec_minmax, 1698 }, 1699 { 1700 .procname = "nr_open", 1701 .data = &sysctl_nr_open, 1702 .maxlen = sizeof(unsigned int), 1703 .mode = 0644, 1704 .proc_handler = proc_dointvec_minmax, 1705 .extra1 = &sysctl_nr_open_min, 1706 .extra2 = &sysctl_nr_open_max, 1707 }, 1708 { 1709 .procname = "dentry-state", 1710 .data = &dentry_stat, 1711 .maxlen = 6*sizeof(long), 1712 .mode = 0444, 1713 .proc_handler = proc_nr_dentry, 1714 }, 1715 { 1716 .procname = "overflowuid", 1717 .data = &fs_overflowuid, 1718 .maxlen = sizeof(int), 1719 .mode = 0644, 1720 .proc_handler = proc_dointvec_minmax, 1721 .extra1 = &minolduid, 1722 .extra2 = &maxolduid, 1723 }, 1724 { 1725 .procname = "overflowgid", 1726 .data = &fs_overflowgid, 1727 .maxlen = sizeof(int), 1728 .mode = 0644, 1729 .proc_handler = proc_dointvec_minmax, 1730 .extra1 = &minolduid, 1731 .extra2 = &maxolduid, 1732 }, 1733 #ifdef CONFIG_FILE_LOCKING 1734 { 1735 .procname = "leases-enable", 1736 .data = &leases_enable, 1737 .maxlen = sizeof(int), 1738 .mode = 0644, 1739 .proc_handler = proc_dointvec, 1740 }, 1741 #endif 1742 #ifdef CONFIG_DNOTIFY 1743 { 1744 .procname = "dir-notify-enable", 1745 .data = &dir_notify_enable, 1746 .maxlen = sizeof(int), 1747 .mode = 0644, 1748 .proc_handler = proc_dointvec, 1749 }, 1750 #endif 1751 #ifdef CONFIG_MMU 1752 #ifdef CONFIG_FILE_LOCKING 1753 { 1754 .procname = "lease-break-time", 1755 .data = &lease_break_time, 1756 .maxlen = sizeof(int), 1757 .mode = 0644, 1758 .proc_handler = proc_dointvec, 1759 }, 1760 #endif 1761 #ifdef CONFIG_AIO 1762 { 1763 .procname = "aio-nr", 1764 .data = &aio_nr, 1765 .maxlen = sizeof(aio_nr), 1766 .mode = 0444, 1767 .proc_handler = proc_doulongvec_minmax, 1768 }, 1769 { 1770 .procname = "aio-max-nr", 1771 .data = &aio_max_nr, 1772 .maxlen = sizeof(aio_max_nr), 1773 .mode = 0644, 1774 .proc_handler = proc_doulongvec_minmax, 1775 }, 1776 #endif /* CONFIG_AIO */ 1777 #ifdef CONFIG_INOTIFY_USER 1778 { 1779 .procname = "inotify", 1780 .mode = 0555, 1781 .child = inotify_table, 1782 }, 1783 #endif 1784 #ifdef CONFIG_EPOLL 1785 { 1786 .procname = "epoll", 1787 .mode = 0555, 1788 .child = epoll_table, 1789 }, 1790 #endif 1791 #endif 1792 { 1793 .procname = "protected_symlinks", 1794 .data = &sysctl_protected_symlinks, 1795 .maxlen = sizeof(int), 1796 .mode = 0600, 1797 .proc_handler = proc_dointvec_minmax, 1798 .extra1 = &zero, 1799 .extra2 = &one, 1800 }, 1801 { 1802 .procname = "protected_hardlinks", 1803 .data = &sysctl_protected_hardlinks, 1804 .maxlen = sizeof(int), 1805 .mode = 0600, 1806 .proc_handler = proc_dointvec_minmax, 1807 .extra1 = &zero, 1808 .extra2 = &one, 1809 }, 1810 { 1811 .procname = "protected_fifos", 1812 .data = &sysctl_protected_fifos, 1813 .maxlen = sizeof(int), 1814 .mode = 0600, 1815 .proc_handler = proc_dointvec_minmax, 1816 .extra1 = &zero, 1817 .extra2 = &two, 1818 }, 1819 { 1820 .procname = "protected_regular", 1821 .data = &sysctl_protected_regular, 1822 .maxlen = sizeof(int), 1823 .mode = 0600, 1824 .proc_handler = proc_dointvec_minmax, 1825 .extra1 = &zero, 1826 .extra2 = &two, 1827 }, 1828 { 1829 .procname = "suid_dumpable", 1830 .data = &suid_dumpable, 1831 .maxlen = sizeof(int), 1832 .mode = 0644, 1833 .proc_handler = proc_dointvec_minmax_coredump, 1834 .extra1 = &zero, 1835 .extra2 = &two, 1836 }, 1837 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1838 { 1839 .procname = "binfmt_misc", 1840 .mode = 0555, 1841 .child = sysctl_mount_point, 1842 }, 1843 #endif 1844 { 1845 .procname = "pipe-max-size", 1846 .data = &pipe_max_size, 1847 .maxlen = sizeof(pipe_max_size), 1848 .mode = 0644, 1849 .proc_handler = proc_dopipe_max_size, 1850 }, 1851 { 1852 .procname = "pipe-user-pages-hard", 1853 .data = &pipe_user_pages_hard, 1854 .maxlen = sizeof(pipe_user_pages_hard), 1855 .mode = 0644, 1856 .proc_handler = proc_doulongvec_minmax, 1857 }, 1858 { 1859 .procname = "pipe-user-pages-soft", 1860 .data = &pipe_user_pages_soft, 1861 .maxlen = sizeof(pipe_user_pages_soft), 1862 .mode = 0644, 1863 .proc_handler = proc_doulongvec_minmax, 1864 }, 1865 { 1866 .procname = "mount-max", 1867 .data = &sysctl_mount_max, 1868 .maxlen = sizeof(unsigned int), 1869 .mode = 0644, 1870 .proc_handler = proc_dointvec_minmax, 1871 .extra1 = &one, 1872 }, 1873 { } 1874 }; 1875 1876 static struct ctl_table debug_table[] = { 1877 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1878 { 1879 .procname = "exception-trace", 1880 .data = &show_unhandled_signals, 1881 .maxlen = sizeof(int), 1882 .mode = 0644, 1883 .proc_handler = proc_dointvec 1884 }, 1885 #endif 1886 #if defined(CONFIG_OPTPROBES) 1887 { 1888 .procname = "kprobes-optimization", 1889 .data = &sysctl_kprobes_optimization, 1890 .maxlen = sizeof(int), 1891 .mode = 0644, 1892 .proc_handler = proc_kprobes_optimization_handler, 1893 .extra1 = &zero, 1894 .extra2 = &one, 1895 }, 1896 #endif 1897 { } 1898 }; 1899 1900 static struct ctl_table dev_table[] = { 1901 { } 1902 }; 1903 1904 int __init sysctl_init(void) 1905 { 1906 struct ctl_table_header *hdr; 1907 1908 hdr = register_sysctl_table(sysctl_base_table); 1909 kmemleak_not_leak(hdr); 1910 return 0; 1911 } 1912 1913 #endif /* CONFIG_SYSCTL */ 1914 1915 /* 1916 * /proc/sys support 1917 */ 1918 1919 #ifdef CONFIG_PROC_SYSCTL 1920 1921 static int _proc_do_string(char *data, int maxlen, int write, 1922 char __user *buffer, 1923 size_t *lenp, loff_t *ppos) 1924 { 1925 size_t len; 1926 char __user *p; 1927 char c; 1928 1929 if (!data || !maxlen || !*lenp) { 1930 *lenp = 0; 1931 return 0; 1932 } 1933 1934 if (write) { 1935 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1936 /* Only continue writes not past the end of buffer. */ 1937 len = strlen(data); 1938 if (len > maxlen - 1) 1939 len = maxlen - 1; 1940 1941 if (*ppos > len) 1942 return 0; 1943 len = *ppos; 1944 } else { 1945 /* Start writing from beginning of buffer. */ 1946 len = 0; 1947 } 1948 1949 *ppos += *lenp; 1950 p = buffer; 1951 while ((p - buffer) < *lenp && len < maxlen - 1) { 1952 if (get_user(c, p++)) 1953 return -EFAULT; 1954 if (c == 0 || c == '\n') 1955 break; 1956 data[len++] = c; 1957 } 1958 data[len] = 0; 1959 } else { 1960 len = strlen(data); 1961 if (len > maxlen) 1962 len = maxlen; 1963 1964 if (*ppos > len) { 1965 *lenp = 0; 1966 return 0; 1967 } 1968 1969 data += *ppos; 1970 len -= *ppos; 1971 1972 if (len > *lenp) 1973 len = *lenp; 1974 if (len) 1975 if (copy_to_user(buffer, data, len)) 1976 return -EFAULT; 1977 if (len < *lenp) { 1978 if (put_user('\n', buffer + len)) 1979 return -EFAULT; 1980 len++; 1981 } 1982 *lenp = len; 1983 *ppos += len; 1984 } 1985 return 0; 1986 } 1987 1988 static void warn_sysctl_write(struct ctl_table *table) 1989 { 1990 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1991 "This will not be supported in the future. To silence this\n" 1992 "warning, set kernel.sysctl_writes_strict = -1\n", 1993 current->comm, table->procname); 1994 } 1995 1996 /** 1997 * proc_first_pos_non_zero_ignore - check if first position is allowed 1998 * @ppos: file position 1999 * @table: the sysctl table 2000 * 2001 * Returns true if the first position is non-zero and the sysctl_writes_strict 2002 * mode indicates this is not allowed for numeric input types. String proc 2003 * handlers can ignore the return value. 2004 */ 2005 static bool proc_first_pos_non_zero_ignore(loff_t *ppos, 2006 struct ctl_table *table) 2007 { 2008 if (!*ppos) 2009 return false; 2010 2011 switch (sysctl_writes_strict) { 2012 case SYSCTL_WRITES_STRICT: 2013 return true; 2014 case SYSCTL_WRITES_WARN: 2015 warn_sysctl_write(table); 2016 return false; 2017 default: 2018 return false; 2019 } 2020 } 2021 2022 /** 2023 * proc_dostring - read a string sysctl 2024 * @table: the sysctl table 2025 * @write: %TRUE if this is a write to the sysctl file 2026 * @buffer: the user buffer 2027 * @lenp: the size of the user buffer 2028 * @ppos: file position 2029 * 2030 * Reads/writes a string from/to the user buffer. If the kernel 2031 * buffer provided is not large enough to hold the string, the 2032 * string is truncated. The copied string is %NULL-terminated. 2033 * If the string is being read by the user process, it is copied 2034 * and a newline '\n' is added. It is truncated if the buffer is 2035 * not large enough. 2036 * 2037 * Returns 0 on success. 2038 */ 2039 int proc_dostring(struct ctl_table *table, int write, 2040 void __user *buffer, size_t *lenp, loff_t *ppos) 2041 { 2042 if (write) 2043 proc_first_pos_non_zero_ignore(ppos, table); 2044 2045 return _proc_do_string((char *)(table->data), table->maxlen, write, 2046 (char __user *)buffer, lenp, ppos); 2047 } 2048 2049 static size_t proc_skip_spaces(char **buf) 2050 { 2051 size_t ret; 2052 char *tmp = skip_spaces(*buf); 2053 ret = tmp - *buf; 2054 *buf = tmp; 2055 return ret; 2056 } 2057 2058 static void proc_skip_char(char **buf, size_t *size, const char v) 2059 { 2060 while (*size) { 2061 if (**buf != v) 2062 break; 2063 (*size)--; 2064 (*buf)++; 2065 } 2066 } 2067 2068 #define TMPBUFLEN 22 2069 /** 2070 * proc_get_long - reads an ASCII formatted integer from a user buffer 2071 * 2072 * @buf: a kernel buffer 2073 * @size: size of the kernel buffer 2074 * @val: this is where the number will be stored 2075 * @neg: set to %TRUE if number is negative 2076 * @perm_tr: a vector which contains the allowed trailers 2077 * @perm_tr_len: size of the perm_tr vector 2078 * @tr: pointer to store the trailer character 2079 * 2080 * In case of success %0 is returned and @buf and @size are updated with 2081 * the amount of bytes read. If @tr is non-NULL and a trailing 2082 * character exists (size is non-zero after returning from this 2083 * function), @tr is updated with the trailing character. 2084 */ 2085 static int proc_get_long(char **buf, size_t *size, 2086 unsigned long *val, bool *neg, 2087 const char *perm_tr, unsigned perm_tr_len, char *tr) 2088 { 2089 int len; 2090 char *p, tmp[TMPBUFLEN]; 2091 2092 if (!*size) 2093 return -EINVAL; 2094 2095 len = *size; 2096 if (len > TMPBUFLEN - 1) 2097 len = TMPBUFLEN - 1; 2098 2099 memcpy(tmp, *buf, len); 2100 2101 tmp[len] = 0; 2102 p = tmp; 2103 if (*p == '-' && *size > 1) { 2104 *neg = true; 2105 p++; 2106 } else 2107 *neg = false; 2108 if (!isdigit(*p)) 2109 return -EINVAL; 2110 2111 *val = simple_strtoul(p, &p, 0); 2112 2113 len = p - tmp; 2114 2115 /* We don't know if the next char is whitespace thus we may accept 2116 * invalid integers (e.g. 1234...a) or two integers instead of one 2117 * (e.g. 123...1). So lets not allow such large numbers. */ 2118 if (len == TMPBUFLEN - 1) 2119 return -EINVAL; 2120 2121 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2122 return -EINVAL; 2123 2124 if (tr && (len < *size)) 2125 *tr = *p; 2126 2127 *buf += len; 2128 *size -= len; 2129 2130 return 0; 2131 } 2132 2133 /** 2134 * proc_put_long - converts an integer to a decimal ASCII formatted string 2135 * 2136 * @buf: the user buffer 2137 * @size: the size of the user buffer 2138 * @val: the integer to be converted 2139 * @neg: sign of the number, %TRUE for negative 2140 * 2141 * In case of success %0 is returned and @buf and @size are updated with 2142 * the amount of bytes written. 2143 */ 2144 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2145 bool neg) 2146 { 2147 int len; 2148 char tmp[TMPBUFLEN], *p = tmp; 2149 2150 sprintf(p, "%s%lu", neg ? "-" : "", val); 2151 len = strlen(tmp); 2152 if (len > *size) 2153 len = *size; 2154 if (copy_to_user(*buf, tmp, len)) 2155 return -EFAULT; 2156 *size -= len; 2157 *buf += len; 2158 return 0; 2159 } 2160 #undef TMPBUFLEN 2161 2162 static int proc_put_char(void __user **buf, size_t *size, char c) 2163 { 2164 if (*size) { 2165 char __user **buffer = (char __user **)buf; 2166 if (put_user(c, *buffer)) 2167 return -EFAULT; 2168 (*size)--, (*buffer)++; 2169 *buf = *buffer; 2170 } 2171 return 0; 2172 } 2173 2174 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2175 int *valp, 2176 int write, void *data) 2177 { 2178 if (write) { 2179 if (*negp) { 2180 if (*lvalp > (unsigned long) INT_MAX + 1) 2181 return -EINVAL; 2182 *valp = -*lvalp; 2183 } else { 2184 if (*lvalp > (unsigned long) INT_MAX) 2185 return -EINVAL; 2186 *valp = *lvalp; 2187 } 2188 } else { 2189 int val = *valp; 2190 if (val < 0) { 2191 *negp = true; 2192 *lvalp = -(unsigned long)val; 2193 } else { 2194 *negp = false; 2195 *lvalp = (unsigned long)val; 2196 } 2197 } 2198 return 0; 2199 } 2200 2201 static int do_proc_douintvec_conv(unsigned long *lvalp, 2202 unsigned int *valp, 2203 int write, void *data) 2204 { 2205 if (write) { 2206 if (*lvalp > UINT_MAX) 2207 return -EINVAL; 2208 *valp = *lvalp; 2209 } else { 2210 unsigned int val = *valp; 2211 *lvalp = (unsigned long)val; 2212 } 2213 return 0; 2214 } 2215 2216 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2217 2218 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2219 int write, void __user *buffer, 2220 size_t *lenp, loff_t *ppos, 2221 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2222 int write, void *data), 2223 void *data) 2224 { 2225 int *i, vleft, first = 1, err = 0; 2226 size_t left; 2227 char *kbuf = NULL, *p; 2228 2229 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2230 *lenp = 0; 2231 return 0; 2232 } 2233 2234 i = (int *) tbl_data; 2235 vleft = table->maxlen / sizeof(*i); 2236 left = *lenp; 2237 2238 if (!conv) 2239 conv = do_proc_dointvec_conv; 2240 2241 if (write) { 2242 if (proc_first_pos_non_zero_ignore(ppos, table)) 2243 goto out; 2244 2245 if (left > PAGE_SIZE - 1) 2246 left = PAGE_SIZE - 1; 2247 p = kbuf = memdup_user_nul(buffer, left); 2248 if (IS_ERR(kbuf)) 2249 return PTR_ERR(kbuf); 2250 } 2251 2252 for (; left && vleft--; i++, first=0) { 2253 unsigned long lval; 2254 bool neg; 2255 2256 if (write) { 2257 left -= proc_skip_spaces(&p); 2258 2259 if (!left) 2260 break; 2261 err = proc_get_long(&p, &left, &lval, &neg, 2262 proc_wspace_sep, 2263 sizeof(proc_wspace_sep), NULL); 2264 if (err) 2265 break; 2266 if (conv(&neg, &lval, i, 1, data)) { 2267 err = -EINVAL; 2268 break; 2269 } 2270 } else { 2271 if (conv(&neg, &lval, i, 0, data)) { 2272 err = -EINVAL; 2273 break; 2274 } 2275 if (!first) 2276 err = proc_put_char(&buffer, &left, '\t'); 2277 if (err) 2278 break; 2279 err = proc_put_long(&buffer, &left, lval, neg); 2280 if (err) 2281 break; 2282 } 2283 } 2284 2285 if (!write && !first && left && !err) 2286 err = proc_put_char(&buffer, &left, '\n'); 2287 if (write && !err && left) 2288 left -= proc_skip_spaces(&p); 2289 if (write) { 2290 kfree(kbuf); 2291 if (first) 2292 return err ? : -EINVAL; 2293 } 2294 *lenp -= left; 2295 out: 2296 *ppos += *lenp; 2297 return err; 2298 } 2299 2300 static int do_proc_dointvec(struct ctl_table *table, int write, 2301 void __user *buffer, size_t *lenp, loff_t *ppos, 2302 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2303 int write, void *data), 2304 void *data) 2305 { 2306 return __do_proc_dointvec(table->data, table, write, 2307 buffer, lenp, ppos, conv, data); 2308 } 2309 2310 static int do_proc_douintvec_w(unsigned int *tbl_data, 2311 struct ctl_table *table, 2312 void __user *buffer, 2313 size_t *lenp, loff_t *ppos, 2314 int (*conv)(unsigned long *lvalp, 2315 unsigned int *valp, 2316 int write, void *data), 2317 void *data) 2318 { 2319 unsigned long lval; 2320 int err = 0; 2321 size_t left; 2322 bool neg; 2323 char *kbuf = NULL, *p; 2324 2325 left = *lenp; 2326 2327 if (proc_first_pos_non_zero_ignore(ppos, table)) 2328 goto bail_early; 2329 2330 if (left > PAGE_SIZE - 1) 2331 left = PAGE_SIZE - 1; 2332 2333 p = kbuf = memdup_user_nul(buffer, left); 2334 if (IS_ERR(kbuf)) 2335 return -EINVAL; 2336 2337 left -= proc_skip_spaces(&p); 2338 if (!left) { 2339 err = -EINVAL; 2340 goto out_free; 2341 } 2342 2343 err = proc_get_long(&p, &left, &lval, &neg, 2344 proc_wspace_sep, 2345 sizeof(proc_wspace_sep), NULL); 2346 if (err || neg) { 2347 err = -EINVAL; 2348 goto out_free; 2349 } 2350 2351 if (conv(&lval, tbl_data, 1, data)) { 2352 err = -EINVAL; 2353 goto out_free; 2354 } 2355 2356 if (!err && left) 2357 left -= proc_skip_spaces(&p); 2358 2359 out_free: 2360 kfree(kbuf); 2361 if (err) 2362 return -EINVAL; 2363 2364 return 0; 2365 2366 /* This is in keeping with old __do_proc_dointvec() */ 2367 bail_early: 2368 *ppos += *lenp; 2369 return err; 2370 } 2371 2372 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, 2373 size_t *lenp, loff_t *ppos, 2374 int (*conv)(unsigned long *lvalp, 2375 unsigned int *valp, 2376 int write, void *data), 2377 void *data) 2378 { 2379 unsigned long lval; 2380 int err = 0; 2381 size_t left; 2382 2383 left = *lenp; 2384 2385 if (conv(&lval, tbl_data, 0, data)) { 2386 err = -EINVAL; 2387 goto out; 2388 } 2389 2390 err = proc_put_long(&buffer, &left, lval, false); 2391 if (err || !left) 2392 goto out; 2393 2394 err = proc_put_char(&buffer, &left, '\n'); 2395 2396 out: 2397 *lenp -= left; 2398 *ppos += *lenp; 2399 2400 return err; 2401 } 2402 2403 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, 2404 int write, void __user *buffer, 2405 size_t *lenp, loff_t *ppos, 2406 int (*conv)(unsigned long *lvalp, 2407 unsigned int *valp, 2408 int write, void *data), 2409 void *data) 2410 { 2411 unsigned int *i, vleft; 2412 2413 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2414 *lenp = 0; 2415 return 0; 2416 } 2417 2418 i = (unsigned int *) tbl_data; 2419 vleft = table->maxlen / sizeof(*i); 2420 2421 /* 2422 * Arrays are not supported, keep this simple. *Do not* add 2423 * support for them. 2424 */ 2425 if (vleft != 1) { 2426 *lenp = 0; 2427 return -EINVAL; 2428 } 2429 2430 if (!conv) 2431 conv = do_proc_douintvec_conv; 2432 2433 if (write) 2434 return do_proc_douintvec_w(i, table, buffer, lenp, ppos, 2435 conv, data); 2436 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); 2437 } 2438 2439 static int do_proc_douintvec(struct ctl_table *table, int write, 2440 void __user *buffer, size_t *lenp, loff_t *ppos, 2441 int (*conv)(unsigned long *lvalp, 2442 unsigned int *valp, 2443 int write, void *data), 2444 void *data) 2445 { 2446 return __do_proc_douintvec(table->data, table, write, 2447 buffer, lenp, ppos, conv, data); 2448 } 2449 2450 /** 2451 * proc_dointvec - read a vector of integers 2452 * @table: the sysctl table 2453 * @write: %TRUE if this is a write to the sysctl file 2454 * @buffer: the user buffer 2455 * @lenp: the size of the user buffer 2456 * @ppos: file position 2457 * 2458 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2459 * values from/to the user buffer, treated as an ASCII string. 2460 * 2461 * Returns 0 on success. 2462 */ 2463 int proc_dointvec(struct ctl_table *table, int write, 2464 void __user *buffer, size_t *lenp, loff_t *ppos) 2465 { 2466 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2467 } 2468 2469 /** 2470 * proc_douintvec - read a vector of unsigned integers 2471 * @table: the sysctl table 2472 * @write: %TRUE if this is a write to the sysctl file 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 int) unsigned integer 2478 * values from/to the user buffer, treated as an ASCII string. 2479 * 2480 * Returns 0 on success. 2481 */ 2482 int proc_douintvec(struct ctl_table *table, int write, 2483 void __user *buffer, size_t *lenp, loff_t *ppos) 2484 { 2485 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2486 do_proc_douintvec_conv, NULL); 2487 } 2488 2489 /* 2490 * Taint values can only be increased 2491 * This means we can safely use a temporary. 2492 */ 2493 static int proc_taint(struct ctl_table *table, int write, 2494 void __user *buffer, size_t *lenp, loff_t *ppos) 2495 { 2496 struct ctl_table t; 2497 unsigned long tmptaint = get_taint(); 2498 int err; 2499 2500 if (write && !capable(CAP_SYS_ADMIN)) 2501 return -EPERM; 2502 2503 t = *table; 2504 t.data = &tmptaint; 2505 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2506 if (err < 0) 2507 return err; 2508 2509 if (write) { 2510 /* 2511 * Poor man's atomic or. Not worth adding a primitive 2512 * to everyone's atomic.h for this 2513 */ 2514 int i; 2515 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2516 if ((tmptaint >> i) & 1) 2517 add_taint(i, LOCKDEP_STILL_OK); 2518 } 2519 } 2520 2521 return err; 2522 } 2523 2524 #ifdef CONFIG_PRINTK 2525 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2526 void __user *buffer, size_t *lenp, loff_t *ppos) 2527 { 2528 if (write && !capable(CAP_SYS_ADMIN)) 2529 return -EPERM; 2530 2531 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2532 } 2533 #endif 2534 2535 /** 2536 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure 2537 * @min: pointer to minimum allowable value 2538 * @max: pointer to maximum allowable value 2539 * 2540 * The do_proc_dointvec_minmax_conv_param structure provides the 2541 * minimum and maximum values for doing range checking for those sysctl 2542 * parameters that use the proc_dointvec_minmax() handler. 2543 */ 2544 struct do_proc_dointvec_minmax_conv_param { 2545 int *min; 2546 int *max; 2547 }; 2548 2549 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2550 int *valp, 2551 int write, void *data) 2552 { 2553 struct do_proc_dointvec_minmax_conv_param *param = data; 2554 if (write) { 2555 int val = *negp ? -*lvalp : *lvalp; 2556 if ((param->min && *param->min > val) || 2557 (param->max && *param->max < val)) 2558 return -EINVAL; 2559 *valp = val; 2560 } else { 2561 int val = *valp; 2562 if (val < 0) { 2563 *negp = true; 2564 *lvalp = -(unsigned long)val; 2565 } else { 2566 *negp = false; 2567 *lvalp = (unsigned long)val; 2568 } 2569 } 2570 return 0; 2571 } 2572 2573 /** 2574 * proc_dointvec_minmax - read a vector of integers with min/max values 2575 * @table: the sysctl table 2576 * @write: %TRUE if this is a write to the sysctl file 2577 * @buffer: the user buffer 2578 * @lenp: the size of the user buffer 2579 * @ppos: file position 2580 * 2581 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2582 * values from/to the user buffer, treated as an ASCII string. 2583 * 2584 * This routine will ensure the values are within the range specified by 2585 * table->extra1 (min) and table->extra2 (max). 2586 * 2587 * Returns 0 on success or -EINVAL on write when the range check fails. 2588 */ 2589 int proc_dointvec_minmax(struct ctl_table *table, int write, 2590 void __user *buffer, size_t *lenp, loff_t *ppos) 2591 { 2592 struct do_proc_dointvec_minmax_conv_param param = { 2593 .min = (int *) table->extra1, 2594 .max = (int *) table->extra2, 2595 }; 2596 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2597 do_proc_dointvec_minmax_conv, ¶m); 2598 } 2599 2600 /** 2601 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure 2602 * @min: pointer to minimum allowable value 2603 * @max: pointer to maximum allowable value 2604 * 2605 * The do_proc_douintvec_minmax_conv_param structure provides the 2606 * minimum and maximum values for doing range checking for those sysctl 2607 * parameters that use the proc_douintvec_minmax() handler. 2608 */ 2609 struct do_proc_douintvec_minmax_conv_param { 2610 unsigned int *min; 2611 unsigned int *max; 2612 }; 2613 2614 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, 2615 unsigned int *valp, 2616 int write, void *data) 2617 { 2618 struct do_proc_douintvec_minmax_conv_param *param = data; 2619 2620 if (write) { 2621 unsigned int val = *lvalp; 2622 2623 if (*lvalp > UINT_MAX) 2624 return -EINVAL; 2625 2626 if ((param->min && *param->min > val) || 2627 (param->max && *param->max < val)) 2628 return -ERANGE; 2629 2630 *valp = val; 2631 } else { 2632 unsigned int val = *valp; 2633 *lvalp = (unsigned long) val; 2634 } 2635 2636 return 0; 2637 } 2638 2639 /** 2640 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values 2641 * @table: the sysctl table 2642 * @write: %TRUE if this is a write to the sysctl file 2643 * @buffer: the user buffer 2644 * @lenp: the size of the user buffer 2645 * @ppos: file position 2646 * 2647 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2648 * values from/to the user buffer, treated as an ASCII string. Negative 2649 * strings are not allowed. 2650 * 2651 * This routine will ensure the values are within the range specified by 2652 * table->extra1 (min) and table->extra2 (max). There is a final sanity 2653 * check for UINT_MAX to avoid having to support wrap around uses from 2654 * userspace. 2655 * 2656 * Returns 0 on success or -ERANGE on write when the range check fails. 2657 */ 2658 int proc_douintvec_minmax(struct ctl_table *table, int write, 2659 void __user *buffer, size_t *lenp, loff_t *ppos) 2660 { 2661 struct do_proc_douintvec_minmax_conv_param param = { 2662 .min = (unsigned int *) table->extra1, 2663 .max = (unsigned int *) table->extra2, 2664 }; 2665 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2666 do_proc_douintvec_minmax_conv, ¶m); 2667 } 2668 2669 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp, 2670 unsigned int *valp, 2671 int write, void *data) 2672 { 2673 if (write) { 2674 unsigned int val; 2675 2676 val = round_pipe_size(*lvalp); 2677 if (val == 0) 2678 return -EINVAL; 2679 2680 *valp = val; 2681 } else { 2682 unsigned int val = *valp; 2683 *lvalp = (unsigned long) val; 2684 } 2685 2686 return 0; 2687 } 2688 2689 static int proc_dopipe_max_size(struct ctl_table *table, int write, 2690 void __user *buffer, size_t *lenp, loff_t *ppos) 2691 { 2692 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2693 do_proc_dopipe_max_size_conv, NULL); 2694 } 2695 2696 static void validate_coredump_safety(void) 2697 { 2698 #ifdef CONFIG_COREDUMP 2699 if (suid_dumpable == SUID_DUMP_ROOT && 2700 core_pattern[0] != '/' && core_pattern[0] != '|') { 2701 printk(KERN_WARNING 2702 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 2703 "Pipe handler or fully qualified core dump path required.\n" 2704 "Set kernel.core_pattern before fs.suid_dumpable.\n" 2705 ); 2706 } 2707 #endif 2708 } 2709 2710 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2711 void __user *buffer, size_t *lenp, loff_t *ppos) 2712 { 2713 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2714 if (!error) 2715 validate_coredump_safety(); 2716 return error; 2717 } 2718 2719 #ifdef CONFIG_COREDUMP 2720 static int proc_dostring_coredump(struct ctl_table *table, int write, 2721 void __user *buffer, size_t *lenp, loff_t *ppos) 2722 { 2723 int error = proc_dostring(table, write, buffer, lenp, ppos); 2724 if (!error) 2725 validate_coredump_safety(); 2726 return error; 2727 } 2728 #endif 2729 2730 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2731 void __user *buffer, 2732 size_t *lenp, loff_t *ppos, 2733 unsigned long convmul, 2734 unsigned long convdiv) 2735 { 2736 unsigned long *i, *min, *max; 2737 int vleft, first = 1, err = 0; 2738 size_t left; 2739 char *kbuf = NULL, *p; 2740 2741 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2742 *lenp = 0; 2743 return 0; 2744 } 2745 2746 i = (unsigned long *) data; 2747 min = (unsigned long *) table->extra1; 2748 max = (unsigned long *) table->extra2; 2749 vleft = table->maxlen / sizeof(unsigned long); 2750 left = *lenp; 2751 2752 if (write) { 2753 if (proc_first_pos_non_zero_ignore(ppos, table)) 2754 goto out; 2755 2756 if (left > PAGE_SIZE - 1) 2757 left = PAGE_SIZE - 1; 2758 p = kbuf = memdup_user_nul(buffer, left); 2759 if (IS_ERR(kbuf)) 2760 return PTR_ERR(kbuf); 2761 } 2762 2763 for (; left && vleft--; i++, first = 0) { 2764 unsigned long val; 2765 2766 if (write) { 2767 bool neg; 2768 2769 left -= proc_skip_spaces(&p); 2770 2771 err = proc_get_long(&p, &left, &val, &neg, 2772 proc_wspace_sep, 2773 sizeof(proc_wspace_sep), NULL); 2774 if (err) 2775 break; 2776 if (neg) 2777 continue; 2778 val = convmul * val / convdiv; 2779 if ((min && val < *min) || (max && val > *max)) 2780 continue; 2781 *i = val; 2782 } else { 2783 val = convdiv * (*i) / convmul; 2784 if (!first) { 2785 err = proc_put_char(&buffer, &left, '\t'); 2786 if (err) 2787 break; 2788 } 2789 err = proc_put_long(&buffer, &left, val, false); 2790 if (err) 2791 break; 2792 } 2793 } 2794 2795 if (!write && !first && left && !err) 2796 err = proc_put_char(&buffer, &left, '\n'); 2797 if (write && !err) 2798 left -= proc_skip_spaces(&p); 2799 if (write) { 2800 kfree(kbuf); 2801 if (first) 2802 return err ? : -EINVAL; 2803 } 2804 *lenp -= left; 2805 out: 2806 *ppos += *lenp; 2807 return err; 2808 } 2809 2810 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2811 void __user *buffer, 2812 size_t *lenp, loff_t *ppos, 2813 unsigned long convmul, 2814 unsigned long convdiv) 2815 { 2816 return __do_proc_doulongvec_minmax(table->data, table, write, 2817 buffer, lenp, ppos, convmul, convdiv); 2818 } 2819 2820 /** 2821 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2822 * @table: the sysctl table 2823 * @write: %TRUE if this is a write to the sysctl file 2824 * @buffer: the user buffer 2825 * @lenp: the size of the user buffer 2826 * @ppos: file position 2827 * 2828 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2829 * values from/to the user buffer, treated as an ASCII string. 2830 * 2831 * This routine will ensure the values are within the range specified by 2832 * table->extra1 (min) and table->extra2 (max). 2833 * 2834 * Returns 0 on success. 2835 */ 2836 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2837 void __user *buffer, size_t *lenp, loff_t *ppos) 2838 { 2839 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2840 } 2841 2842 /** 2843 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2844 * @table: the sysctl table 2845 * @write: %TRUE if this is a write to the sysctl file 2846 * @buffer: the user buffer 2847 * @lenp: the size of the user buffer 2848 * @ppos: file position 2849 * 2850 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2851 * values from/to the user buffer, treated as an ASCII string. The values 2852 * are treated as milliseconds, and converted to jiffies when they are stored. 2853 * 2854 * This routine will ensure the values are within the range specified by 2855 * table->extra1 (min) and table->extra2 (max). 2856 * 2857 * Returns 0 on success. 2858 */ 2859 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2860 void __user *buffer, 2861 size_t *lenp, loff_t *ppos) 2862 { 2863 return do_proc_doulongvec_minmax(table, write, buffer, 2864 lenp, ppos, HZ, 1000l); 2865 } 2866 2867 2868 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2869 int *valp, 2870 int write, void *data) 2871 { 2872 if (write) { 2873 if (*lvalp > INT_MAX / HZ) 2874 return 1; 2875 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2876 } else { 2877 int val = *valp; 2878 unsigned long lval; 2879 if (val < 0) { 2880 *negp = true; 2881 lval = -(unsigned long)val; 2882 } else { 2883 *negp = false; 2884 lval = (unsigned long)val; 2885 } 2886 *lvalp = lval / HZ; 2887 } 2888 return 0; 2889 } 2890 2891 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2892 int *valp, 2893 int write, void *data) 2894 { 2895 if (write) { 2896 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2897 return 1; 2898 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2899 } else { 2900 int val = *valp; 2901 unsigned long lval; 2902 if (val < 0) { 2903 *negp = true; 2904 lval = -(unsigned long)val; 2905 } else { 2906 *negp = false; 2907 lval = (unsigned long)val; 2908 } 2909 *lvalp = jiffies_to_clock_t(lval); 2910 } 2911 return 0; 2912 } 2913 2914 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2915 int *valp, 2916 int write, void *data) 2917 { 2918 if (write) { 2919 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2920 2921 if (jif > INT_MAX) 2922 return 1; 2923 *valp = (int)jif; 2924 } else { 2925 int val = *valp; 2926 unsigned long lval; 2927 if (val < 0) { 2928 *negp = true; 2929 lval = -(unsigned long)val; 2930 } else { 2931 *negp = false; 2932 lval = (unsigned long)val; 2933 } 2934 *lvalp = jiffies_to_msecs(lval); 2935 } 2936 return 0; 2937 } 2938 2939 /** 2940 * proc_dointvec_jiffies - read a vector of integers as seconds 2941 * @table: the sysctl table 2942 * @write: %TRUE if this is a write to the sysctl file 2943 * @buffer: the user buffer 2944 * @lenp: the size of the user buffer 2945 * @ppos: file position 2946 * 2947 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2948 * values from/to the user buffer, treated as an ASCII string. 2949 * The values read are assumed to be in seconds, and are converted into 2950 * jiffies. 2951 * 2952 * Returns 0 on success. 2953 */ 2954 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2955 void __user *buffer, size_t *lenp, loff_t *ppos) 2956 { 2957 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2958 do_proc_dointvec_jiffies_conv,NULL); 2959 } 2960 2961 /** 2962 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2963 * @table: the sysctl table 2964 * @write: %TRUE if this is a write to the sysctl file 2965 * @buffer: the user buffer 2966 * @lenp: the size of the user buffer 2967 * @ppos: pointer to the file position 2968 * 2969 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2970 * values from/to the user buffer, treated as an ASCII string. 2971 * The values read are assumed to be in 1/USER_HZ seconds, and 2972 * are converted into jiffies. 2973 * 2974 * Returns 0 on success. 2975 */ 2976 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2977 void __user *buffer, size_t *lenp, loff_t *ppos) 2978 { 2979 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2980 do_proc_dointvec_userhz_jiffies_conv,NULL); 2981 } 2982 2983 /** 2984 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2985 * @table: the sysctl table 2986 * @write: %TRUE if this is a write to the sysctl file 2987 * @buffer: the user buffer 2988 * @lenp: the size of the user buffer 2989 * @ppos: file position 2990 * @ppos: the current position in the file 2991 * 2992 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2993 * values from/to the user buffer, treated as an ASCII string. 2994 * The values read are assumed to be in 1/1000 seconds, and 2995 * are converted into jiffies. 2996 * 2997 * Returns 0 on success. 2998 */ 2999 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 3000 void __user *buffer, size_t *lenp, loff_t *ppos) 3001 { 3002 return do_proc_dointvec(table, write, buffer, lenp, ppos, 3003 do_proc_dointvec_ms_jiffies_conv, NULL); 3004 } 3005 3006 static int proc_do_cad_pid(struct ctl_table *table, int write, 3007 void __user *buffer, size_t *lenp, loff_t *ppos) 3008 { 3009 struct pid *new_pid; 3010 pid_t tmp; 3011 int r; 3012 3013 tmp = pid_vnr(cad_pid); 3014 3015 r = __do_proc_dointvec(&tmp, table, write, buffer, 3016 lenp, ppos, NULL, NULL); 3017 if (r || !write) 3018 return r; 3019 3020 new_pid = find_get_pid(tmp); 3021 if (!new_pid) 3022 return -ESRCH; 3023 3024 put_pid(xchg(&cad_pid, new_pid)); 3025 return 0; 3026 } 3027 3028 /** 3029 * proc_do_large_bitmap - read/write from/to a large bitmap 3030 * @table: the sysctl table 3031 * @write: %TRUE if this is a write to the sysctl file 3032 * @buffer: the user buffer 3033 * @lenp: the size of the user buffer 3034 * @ppos: file position 3035 * 3036 * The bitmap is stored at table->data and the bitmap length (in bits) 3037 * in table->maxlen. 3038 * 3039 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 3040 * large bitmaps may be represented in a compact manner. Writing into 3041 * the file will clear the bitmap then update it with the given input. 3042 * 3043 * Returns 0 on success. 3044 */ 3045 int proc_do_large_bitmap(struct ctl_table *table, int write, 3046 void __user *buffer, size_t *lenp, loff_t *ppos) 3047 { 3048 int err = 0; 3049 bool first = 1; 3050 size_t left = *lenp; 3051 unsigned long bitmap_len = table->maxlen; 3052 unsigned long *bitmap = *(unsigned long **) table->data; 3053 unsigned long *tmp_bitmap = NULL; 3054 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 3055 3056 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 3057 *lenp = 0; 3058 return 0; 3059 } 3060 3061 if (write) { 3062 char *kbuf, *p; 3063 3064 if (left > PAGE_SIZE - 1) 3065 left = PAGE_SIZE - 1; 3066 3067 p = kbuf = memdup_user_nul(buffer, left); 3068 if (IS_ERR(kbuf)) 3069 return PTR_ERR(kbuf); 3070 3071 tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len), 3072 sizeof(unsigned long), 3073 GFP_KERNEL); 3074 if (!tmp_bitmap) { 3075 kfree(kbuf); 3076 return -ENOMEM; 3077 } 3078 proc_skip_char(&p, &left, '\n'); 3079 while (!err && left) { 3080 unsigned long val_a, val_b; 3081 bool neg; 3082 3083 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 3084 sizeof(tr_a), &c); 3085 if (err) 3086 break; 3087 if (val_a >= bitmap_len || neg) { 3088 err = -EINVAL; 3089 break; 3090 } 3091 3092 val_b = val_a; 3093 if (left) { 3094 p++; 3095 left--; 3096 } 3097 3098 if (c == '-') { 3099 err = proc_get_long(&p, &left, &val_b, 3100 &neg, tr_b, sizeof(tr_b), 3101 &c); 3102 if (err) 3103 break; 3104 if (val_b >= bitmap_len || neg || 3105 val_a > val_b) { 3106 err = -EINVAL; 3107 break; 3108 } 3109 if (left) { 3110 p++; 3111 left--; 3112 } 3113 } 3114 3115 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 3116 first = 0; 3117 proc_skip_char(&p, &left, '\n'); 3118 } 3119 kfree(kbuf); 3120 } else { 3121 unsigned long bit_a, bit_b = 0; 3122 3123 while (left) { 3124 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 3125 if (bit_a >= bitmap_len) 3126 break; 3127 bit_b = find_next_zero_bit(bitmap, bitmap_len, 3128 bit_a + 1) - 1; 3129 3130 if (!first) { 3131 err = proc_put_char(&buffer, &left, ','); 3132 if (err) 3133 break; 3134 } 3135 err = proc_put_long(&buffer, &left, bit_a, false); 3136 if (err) 3137 break; 3138 if (bit_a != bit_b) { 3139 err = proc_put_char(&buffer, &left, '-'); 3140 if (err) 3141 break; 3142 err = proc_put_long(&buffer, &left, bit_b, false); 3143 if (err) 3144 break; 3145 } 3146 3147 first = 0; bit_b++; 3148 } 3149 if (!err) 3150 err = proc_put_char(&buffer, &left, '\n'); 3151 } 3152 3153 if (!err) { 3154 if (write) { 3155 if (*ppos) 3156 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 3157 else 3158 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 3159 } 3160 *lenp -= left; 3161 *ppos += *lenp; 3162 } 3163 3164 kfree(tmp_bitmap); 3165 return err; 3166 } 3167 3168 #else /* CONFIG_PROC_SYSCTL */ 3169 3170 int proc_dostring(struct ctl_table *table, int write, 3171 void __user *buffer, size_t *lenp, loff_t *ppos) 3172 { 3173 return -ENOSYS; 3174 } 3175 3176 int proc_dointvec(struct ctl_table *table, int write, 3177 void __user *buffer, size_t *lenp, loff_t *ppos) 3178 { 3179 return -ENOSYS; 3180 } 3181 3182 int proc_douintvec(struct ctl_table *table, int write, 3183 void __user *buffer, size_t *lenp, loff_t *ppos) 3184 { 3185 return -ENOSYS; 3186 } 3187 3188 int proc_dointvec_minmax(struct ctl_table *table, int write, 3189 void __user *buffer, size_t *lenp, loff_t *ppos) 3190 { 3191 return -ENOSYS; 3192 } 3193 3194 int proc_douintvec_minmax(struct ctl_table *table, int write, 3195 void __user *buffer, size_t *lenp, loff_t *ppos) 3196 { 3197 return -ENOSYS; 3198 } 3199 3200 int proc_dointvec_jiffies(struct ctl_table *table, int write, 3201 void __user *buffer, size_t *lenp, loff_t *ppos) 3202 { 3203 return -ENOSYS; 3204 } 3205 3206 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 3207 void __user *buffer, size_t *lenp, loff_t *ppos) 3208 { 3209 return -ENOSYS; 3210 } 3211 3212 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 3213 void __user *buffer, size_t *lenp, loff_t *ppos) 3214 { 3215 return -ENOSYS; 3216 } 3217 3218 int proc_doulongvec_minmax(struct ctl_table *table, int write, 3219 void __user *buffer, size_t *lenp, loff_t *ppos) 3220 { 3221 return -ENOSYS; 3222 } 3223 3224 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 3225 void __user *buffer, 3226 size_t *lenp, loff_t *ppos) 3227 { 3228 return -ENOSYS; 3229 } 3230 3231 3232 #endif /* CONFIG_PROC_SYSCTL */ 3233 3234 /* 3235 * No sense putting this after each symbol definition, twice, 3236 * exception granted :-) 3237 */ 3238 EXPORT_SYMBOL(proc_dointvec); 3239 EXPORT_SYMBOL(proc_douintvec); 3240 EXPORT_SYMBOL(proc_dointvec_jiffies); 3241 EXPORT_SYMBOL(proc_dointvec_minmax); 3242 EXPORT_SYMBOL_GPL(proc_douintvec_minmax); 3243 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3244 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3245 EXPORT_SYMBOL(proc_dostring); 3246 EXPORT_SYMBOL(proc_doulongvec_minmax); 3247 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3248