1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sysctl.c: General linux system control interface 4 * 5 * Begun 24 March 1995, Stephen Tweedie 6 * Added /proc support, Dec 1995 7 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. 8 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. 9 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. 10 * Dynamic registration fixes, Stephen Tweedie. 11 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. 12 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris 13 * Horn. 14 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. 15 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. 16 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill 17 * Wendling. 18 * The list_for_each() macro wasn't appropriate for the sysctl loop. 19 * Removed it and replaced it with older style, 03/23/00, Bill Wendling 20 */ 21 22 #include <linux/module.h> 23 #include <linux/aio.h> 24 #include <linux/mm.h> 25 #include <linux/swap.h> 26 #include <linux/slab.h> 27 #include <linux/sysctl.h> 28 #include <linux/bitmap.h> 29 #include <linux/signal.h> 30 #include <linux/printk.h> 31 #include <linux/proc_fs.h> 32 #include <linux/security.h> 33 #include <linux/ctype.h> 34 #include <linux/kmemleak.h> 35 #include <linux/fs.h> 36 #include <linux/init.h> 37 #include <linux/kernel.h> 38 #include <linux/kobject.h> 39 #include <linux/net.h> 40 #include <linux/sysrq.h> 41 #include <linux/highuid.h> 42 #include <linux/writeback.h> 43 #include <linux/ratelimit.h> 44 #include <linux/compaction.h> 45 #include <linux/hugetlb.h> 46 #include <linux/initrd.h> 47 #include <linux/key.h> 48 #include <linux/times.h> 49 #include <linux/limits.h> 50 #include <linux/dcache.h> 51 #include <linux/dnotify.h> 52 #include <linux/syscalls.h> 53 #include <linux/vmstat.h> 54 #include <linux/nfs_fs.h> 55 #include <linux/acpi.h> 56 #include <linux/reboot.h> 57 #include <linux/ftrace.h> 58 #include <linux/perf_event.h> 59 #include <linux/kprobes.h> 60 #include <linux/pipe_fs_i.h> 61 #include <linux/oom.h> 62 #include <linux/kmod.h> 63 #include <linux/capability.h> 64 #include <linux/binfmts.h> 65 #include <linux/sched/sysctl.h> 66 #include <linux/sched/coredump.h> 67 #include <linux/kexec.h> 68 #include <linux/bpf.h> 69 #include <linux/mount.h> 70 #include <linux/userfaultfd_k.h> 71 72 #include "../lib/kstrtox.h" 73 74 #include <linux/uaccess.h> 75 #include <asm/processor.h> 76 77 #ifdef CONFIG_X86 78 #include <asm/nmi.h> 79 #include <asm/stacktrace.h> 80 #include <asm/io.h> 81 #endif 82 #ifdef CONFIG_SPARC 83 #include <asm/setup.h> 84 #endif 85 #ifdef CONFIG_BSD_PROCESS_ACCT 86 #include <linux/acct.h> 87 #endif 88 #ifdef CONFIG_RT_MUTEXES 89 #include <linux/rtmutex.h> 90 #endif 91 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 92 #include <linux/lockdep.h> 93 #endif 94 #ifdef CONFIG_CHR_DEV_SG 95 #include <scsi/sg.h> 96 #endif 97 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE 98 #include <linux/stackleak.h> 99 #endif 100 #ifdef CONFIG_LOCKUP_DETECTOR 101 #include <linux/nmi.h> 102 #endif 103 104 #if defined(CONFIG_SYSCTL) 105 106 /* External variables not in a header file. */ 107 extern int suid_dumpable; 108 #ifdef CONFIG_COREDUMP 109 extern int core_uses_pid; 110 extern char core_pattern[]; 111 extern unsigned int core_pipe_limit; 112 #endif 113 extern int pid_max; 114 extern int pid_max_min, pid_max_max; 115 extern int percpu_pagelist_fraction; 116 extern int latencytop_enabled; 117 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; 118 #ifndef CONFIG_MMU 119 extern int sysctl_nr_trim_pages; 120 #endif 121 122 /* Constants used for minimum and maximum */ 123 #ifdef CONFIG_LOCKUP_DETECTOR 124 static int sixty = 60; 125 #endif 126 127 static int __maybe_unused neg_one = -1; 128 static int __maybe_unused two = 2; 129 static int __maybe_unused four = 4; 130 static unsigned long zero_ul; 131 static unsigned long one_ul = 1; 132 static unsigned long long_max = LONG_MAX; 133 static int one_hundred = 100; 134 static int one_thousand = 1000; 135 #ifdef CONFIG_PRINTK 136 static int ten_thousand = 10000; 137 #endif 138 #ifdef CONFIG_PERF_EVENTS 139 static int six_hundred_forty_kb = 640 * 1024; 140 #endif 141 142 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 143 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 144 145 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 146 static int maxolduid = 65535; 147 static int minolduid; 148 149 static int ngroups_max = NGROUPS_MAX; 150 static const int cap_last_cap = CAP_LAST_CAP; 151 152 /* 153 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs 154 * and hung_task_check_interval_secs 155 */ 156 #ifdef CONFIG_DETECT_HUNG_TASK 157 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 158 #endif 159 160 #ifdef CONFIG_INOTIFY_USER 161 #include <linux/inotify.h> 162 #endif 163 #ifdef CONFIG_SPARC 164 #endif 165 166 #ifdef CONFIG_PARISC 167 extern int pwrsw_enabled; 168 #endif 169 170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 171 extern int unaligned_enabled; 172 #endif 173 174 #ifdef CONFIG_IA64 175 extern int unaligned_dump_stack; 176 #endif 177 178 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 179 extern int no_unaligned_warning; 180 #endif 181 182 #ifdef CONFIG_PROC_SYSCTL 183 184 /** 185 * enum sysctl_writes_mode - supported sysctl write modes 186 * 187 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value 188 * to be written, and multiple writes on the same sysctl file descriptor 189 * will rewrite the sysctl value, regardless of file position. No warning 190 * is issued when the initial position is not 0. 191 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is 192 * not 0. 193 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at 194 * file position 0 and the value must be fully contained in the buffer 195 * sent to the write syscall. If dealing with strings respect the file 196 * position, but restrict this to the max length of the buffer, anything 197 * passed the max length will be ignored. Multiple writes will append 198 * to the buffer. 199 * 200 * These write modes control how current file position affects the behavior of 201 * updating sysctl values through the proc interface on each write. 202 */ 203 enum sysctl_writes_mode { 204 SYSCTL_WRITES_LEGACY = -1, 205 SYSCTL_WRITES_WARN = 0, 206 SYSCTL_WRITES_STRICT = 1, 207 }; 208 209 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; 210 211 static int proc_do_cad_pid(struct ctl_table *table, int write, 212 void __user *buffer, size_t *lenp, loff_t *ppos); 213 static int proc_taint(struct ctl_table *table, int write, 214 void __user *buffer, size_t *lenp, loff_t *ppos); 215 #endif 216 217 #ifdef CONFIG_PRINTK 218 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 219 void __user *buffer, size_t *lenp, loff_t *ppos); 220 #endif 221 222 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 223 void __user *buffer, size_t *lenp, loff_t *ppos); 224 #ifdef CONFIG_COREDUMP 225 static int proc_dostring_coredump(struct ctl_table *table, int write, 226 void __user *buffer, size_t *lenp, loff_t *ppos); 227 #endif 228 static int proc_dopipe_max_size(struct ctl_table *table, int write, 229 void __user *buffer, size_t *lenp, loff_t *ppos); 230 231 #ifdef CONFIG_MAGIC_SYSRQ 232 /* Note: sysrq code uses its own private copy */ 233 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 234 235 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 236 void __user *buffer, size_t *lenp, 237 loff_t *ppos) 238 { 239 int error; 240 241 error = proc_dointvec(table, write, buffer, lenp, ppos); 242 if (error) 243 return error; 244 245 if (write) 246 sysrq_toggle_support(__sysrq_enabled); 247 248 return 0; 249 } 250 251 #endif 252 253 static struct ctl_table kern_table[]; 254 static struct ctl_table vm_table[]; 255 static struct ctl_table fs_table[]; 256 static struct ctl_table debug_table[]; 257 static struct ctl_table dev_table[]; 258 extern struct ctl_table random_table[]; 259 #ifdef CONFIG_EPOLL 260 extern struct ctl_table epoll_table[]; 261 #endif 262 263 #ifdef CONFIG_FW_LOADER_USER_HELPER 264 extern struct ctl_table firmware_config_table[]; 265 #endif 266 267 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ 268 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) 269 int sysctl_legacy_va_layout; 270 #endif 271 272 /* The default sysctl tables: */ 273 274 static struct ctl_table sysctl_base_table[] = { 275 { 276 .procname = "kernel", 277 .mode = 0555, 278 .child = kern_table, 279 }, 280 { 281 .procname = "vm", 282 .mode = 0555, 283 .child = vm_table, 284 }, 285 { 286 .procname = "fs", 287 .mode = 0555, 288 .child = fs_table, 289 }, 290 { 291 .procname = "debug", 292 .mode = 0555, 293 .child = debug_table, 294 }, 295 { 296 .procname = "dev", 297 .mode = 0555, 298 .child = dev_table, 299 }, 300 { } 301 }; 302 303 #ifdef CONFIG_SCHED_DEBUG 304 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 305 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 306 static int min_wakeup_granularity_ns; /* 0 usecs */ 307 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 308 #ifdef CONFIG_SMP 309 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 310 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 311 #endif /* CONFIG_SMP */ 312 #endif /* CONFIG_SCHED_DEBUG */ 313 314 #ifdef CONFIG_COMPACTION 315 static int min_extfrag_threshold; 316 static int max_extfrag_threshold = 1000; 317 #endif 318 319 static struct ctl_table kern_table[] = { 320 { 321 .procname = "sched_child_runs_first", 322 .data = &sysctl_sched_child_runs_first, 323 .maxlen = sizeof(unsigned int), 324 .mode = 0644, 325 .proc_handler = proc_dointvec, 326 }, 327 #ifdef CONFIG_SCHED_DEBUG 328 { 329 .procname = "sched_min_granularity_ns", 330 .data = &sysctl_sched_min_granularity, 331 .maxlen = sizeof(unsigned int), 332 .mode = 0644, 333 .proc_handler = sched_proc_update_handler, 334 .extra1 = &min_sched_granularity_ns, 335 .extra2 = &max_sched_granularity_ns, 336 }, 337 { 338 .procname = "sched_latency_ns", 339 .data = &sysctl_sched_latency, 340 .maxlen = sizeof(unsigned int), 341 .mode = 0644, 342 .proc_handler = sched_proc_update_handler, 343 .extra1 = &min_sched_granularity_ns, 344 .extra2 = &max_sched_granularity_ns, 345 }, 346 { 347 .procname = "sched_wakeup_granularity_ns", 348 .data = &sysctl_sched_wakeup_granularity, 349 .maxlen = sizeof(unsigned int), 350 .mode = 0644, 351 .proc_handler = sched_proc_update_handler, 352 .extra1 = &min_wakeup_granularity_ns, 353 .extra2 = &max_wakeup_granularity_ns, 354 }, 355 #ifdef CONFIG_SMP 356 { 357 .procname = "sched_tunable_scaling", 358 .data = &sysctl_sched_tunable_scaling, 359 .maxlen = sizeof(enum sched_tunable_scaling), 360 .mode = 0644, 361 .proc_handler = sched_proc_update_handler, 362 .extra1 = &min_sched_tunable_scaling, 363 .extra2 = &max_sched_tunable_scaling, 364 }, 365 { 366 .procname = "sched_migration_cost_ns", 367 .data = &sysctl_sched_migration_cost, 368 .maxlen = sizeof(unsigned int), 369 .mode = 0644, 370 .proc_handler = proc_dointvec, 371 }, 372 { 373 .procname = "sched_nr_migrate", 374 .data = &sysctl_sched_nr_migrate, 375 .maxlen = sizeof(unsigned int), 376 .mode = 0644, 377 .proc_handler = proc_dointvec, 378 }, 379 #ifdef CONFIG_SCHEDSTATS 380 { 381 .procname = "sched_schedstats", 382 .data = NULL, 383 .maxlen = sizeof(unsigned int), 384 .mode = 0644, 385 .proc_handler = sysctl_schedstats, 386 .extra1 = SYSCTL_ZERO, 387 .extra2 = SYSCTL_ONE, 388 }, 389 #endif /* CONFIG_SCHEDSTATS */ 390 #endif /* CONFIG_SMP */ 391 #ifdef CONFIG_NUMA_BALANCING 392 { 393 .procname = "numa_balancing_scan_delay_ms", 394 .data = &sysctl_numa_balancing_scan_delay, 395 .maxlen = sizeof(unsigned int), 396 .mode = 0644, 397 .proc_handler = proc_dointvec, 398 }, 399 { 400 .procname = "numa_balancing_scan_period_min_ms", 401 .data = &sysctl_numa_balancing_scan_period_min, 402 .maxlen = sizeof(unsigned int), 403 .mode = 0644, 404 .proc_handler = proc_dointvec, 405 }, 406 { 407 .procname = "numa_balancing_scan_period_max_ms", 408 .data = &sysctl_numa_balancing_scan_period_max, 409 .maxlen = sizeof(unsigned int), 410 .mode = 0644, 411 .proc_handler = proc_dointvec, 412 }, 413 { 414 .procname = "numa_balancing_scan_size_mb", 415 .data = &sysctl_numa_balancing_scan_size, 416 .maxlen = sizeof(unsigned int), 417 .mode = 0644, 418 .proc_handler = proc_dointvec_minmax, 419 .extra1 = SYSCTL_ONE, 420 }, 421 { 422 .procname = "numa_balancing", 423 .data = NULL, /* filled in by handler */ 424 .maxlen = sizeof(unsigned int), 425 .mode = 0644, 426 .proc_handler = sysctl_numa_balancing, 427 .extra1 = SYSCTL_ZERO, 428 .extra2 = SYSCTL_ONE, 429 }, 430 #endif /* CONFIG_NUMA_BALANCING */ 431 #endif /* CONFIG_SCHED_DEBUG */ 432 { 433 .procname = "sched_rt_period_us", 434 .data = &sysctl_sched_rt_period, 435 .maxlen = sizeof(unsigned int), 436 .mode = 0644, 437 .proc_handler = sched_rt_handler, 438 }, 439 { 440 .procname = "sched_rt_runtime_us", 441 .data = &sysctl_sched_rt_runtime, 442 .maxlen = sizeof(int), 443 .mode = 0644, 444 .proc_handler = sched_rt_handler, 445 }, 446 { 447 .procname = "sched_rr_timeslice_ms", 448 .data = &sysctl_sched_rr_timeslice, 449 .maxlen = sizeof(int), 450 .mode = 0644, 451 .proc_handler = sched_rr_handler, 452 }, 453 #ifdef CONFIG_UCLAMP_TASK 454 { 455 .procname = "sched_util_clamp_min", 456 .data = &sysctl_sched_uclamp_util_min, 457 .maxlen = sizeof(unsigned int), 458 .mode = 0644, 459 .proc_handler = sysctl_sched_uclamp_handler, 460 }, 461 { 462 .procname = "sched_util_clamp_max", 463 .data = &sysctl_sched_uclamp_util_max, 464 .maxlen = sizeof(unsigned int), 465 .mode = 0644, 466 .proc_handler = sysctl_sched_uclamp_handler, 467 }, 468 #endif 469 #ifdef CONFIG_SCHED_AUTOGROUP 470 { 471 .procname = "sched_autogroup_enabled", 472 .data = &sysctl_sched_autogroup_enabled, 473 .maxlen = sizeof(unsigned int), 474 .mode = 0644, 475 .proc_handler = proc_dointvec_minmax, 476 .extra1 = SYSCTL_ZERO, 477 .extra2 = SYSCTL_ONE, 478 }, 479 #endif 480 #ifdef CONFIG_CFS_BANDWIDTH 481 { 482 .procname = "sched_cfs_bandwidth_slice_us", 483 .data = &sysctl_sched_cfs_bandwidth_slice, 484 .maxlen = sizeof(unsigned int), 485 .mode = 0644, 486 .proc_handler = proc_dointvec_minmax, 487 .extra1 = SYSCTL_ONE, 488 }, 489 #endif 490 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) 491 { 492 .procname = "sched_energy_aware", 493 .data = &sysctl_sched_energy_aware, 494 .maxlen = sizeof(unsigned int), 495 .mode = 0644, 496 .proc_handler = sched_energy_aware_handler, 497 .extra1 = SYSCTL_ZERO, 498 .extra2 = SYSCTL_ONE, 499 }, 500 #endif 501 #ifdef CONFIG_PROVE_LOCKING 502 { 503 .procname = "prove_locking", 504 .data = &prove_locking, 505 .maxlen = sizeof(int), 506 .mode = 0644, 507 .proc_handler = proc_dointvec, 508 }, 509 #endif 510 #ifdef CONFIG_LOCK_STAT 511 { 512 .procname = "lock_stat", 513 .data = &lock_stat, 514 .maxlen = sizeof(int), 515 .mode = 0644, 516 .proc_handler = proc_dointvec, 517 }, 518 #endif 519 { 520 .procname = "panic", 521 .data = &panic_timeout, 522 .maxlen = sizeof(int), 523 .mode = 0644, 524 .proc_handler = proc_dointvec, 525 }, 526 #ifdef CONFIG_COREDUMP 527 { 528 .procname = "core_uses_pid", 529 .data = &core_uses_pid, 530 .maxlen = sizeof(int), 531 .mode = 0644, 532 .proc_handler = proc_dointvec, 533 }, 534 { 535 .procname = "core_pattern", 536 .data = core_pattern, 537 .maxlen = CORENAME_MAX_SIZE, 538 .mode = 0644, 539 .proc_handler = proc_dostring_coredump, 540 }, 541 { 542 .procname = "core_pipe_limit", 543 .data = &core_pipe_limit, 544 .maxlen = sizeof(unsigned int), 545 .mode = 0644, 546 .proc_handler = proc_dointvec, 547 }, 548 #endif 549 #ifdef CONFIG_PROC_SYSCTL 550 { 551 .procname = "tainted", 552 .maxlen = sizeof(long), 553 .mode = 0644, 554 .proc_handler = proc_taint, 555 }, 556 { 557 .procname = "sysctl_writes_strict", 558 .data = &sysctl_writes_strict, 559 .maxlen = sizeof(int), 560 .mode = 0644, 561 .proc_handler = proc_dointvec_minmax, 562 .extra1 = &neg_one, 563 .extra2 = SYSCTL_ONE, 564 }, 565 #endif 566 #ifdef CONFIG_LATENCYTOP 567 { 568 .procname = "latencytop", 569 .data = &latencytop_enabled, 570 .maxlen = sizeof(int), 571 .mode = 0644, 572 .proc_handler = sysctl_latencytop, 573 }, 574 #endif 575 #ifdef CONFIG_BLK_DEV_INITRD 576 { 577 .procname = "real-root-dev", 578 .data = &real_root_dev, 579 .maxlen = sizeof(int), 580 .mode = 0644, 581 .proc_handler = proc_dointvec, 582 }, 583 #endif 584 { 585 .procname = "print-fatal-signals", 586 .data = &print_fatal_signals, 587 .maxlen = sizeof(int), 588 .mode = 0644, 589 .proc_handler = proc_dointvec, 590 }, 591 #ifdef CONFIG_SPARC 592 { 593 .procname = "reboot-cmd", 594 .data = reboot_command, 595 .maxlen = 256, 596 .mode = 0644, 597 .proc_handler = proc_dostring, 598 }, 599 { 600 .procname = "stop-a", 601 .data = &stop_a_enabled, 602 .maxlen = sizeof (int), 603 .mode = 0644, 604 .proc_handler = proc_dointvec, 605 }, 606 { 607 .procname = "scons-poweroff", 608 .data = &scons_pwroff, 609 .maxlen = sizeof (int), 610 .mode = 0644, 611 .proc_handler = proc_dointvec, 612 }, 613 #endif 614 #ifdef CONFIG_SPARC64 615 { 616 .procname = "tsb-ratio", 617 .data = &sysctl_tsb_ratio, 618 .maxlen = sizeof (int), 619 .mode = 0644, 620 .proc_handler = proc_dointvec, 621 }, 622 #endif 623 #ifdef CONFIG_PARISC 624 { 625 .procname = "soft-power", 626 .data = &pwrsw_enabled, 627 .maxlen = sizeof (int), 628 .mode = 0644, 629 .proc_handler = proc_dointvec, 630 }, 631 #endif 632 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 633 { 634 .procname = "unaligned-trap", 635 .data = &unaligned_enabled, 636 .maxlen = sizeof (int), 637 .mode = 0644, 638 .proc_handler = proc_dointvec, 639 }, 640 #endif 641 { 642 .procname = "ctrl-alt-del", 643 .data = &C_A_D, 644 .maxlen = sizeof(int), 645 .mode = 0644, 646 .proc_handler = proc_dointvec, 647 }, 648 #ifdef CONFIG_FUNCTION_TRACER 649 { 650 .procname = "ftrace_enabled", 651 .data = &ftrace_enabled, 652 .maxlen = sizeof(int), 653 .mode = 0644, 654 .proc_handler = ftrace_enable_sysctl, 655 }, 656 #endif 657 #ifdef CONFIG_STACK_TRACER 658 { 659 .procname = "stack_tracer_enabled", 660 .data = &stack_tracer_enabled, 661 .maxlen = sizeof(int), 662 .mode = 0644, 663 .proc_handler = stack_trace_sysctl, 664 }, 665 #endif 666 #ifdef CONFIG_TRACING 667 { 668 .procname = "ftrace_dump_on_oops", 669 .data = &ftrace_dump_on_oops, 670 .maxlen = sizeof(int), 671 .mode = 0644, 672 .proc_handler = proc_dointvec, 673 }, 674 { 675 .procname = "traceoff_on_warning", 676 .data = &__disable_trace_on_warning, 677 .maxlen = sizeof(__disable_trace_on_warning), 678 .mode = 0644, 679 .proc_handler = proc_dointvec, 680 }, 681 { 682 .procname = "tracepoint_printk", 683 .data = &tracepoint_printk, 684 .maxlen = sizeof(tracepoint_printk), 685 .mode = 0644, 686 .proc_handler = tracepoint_printk_sysctl, 687 }, 688 #endif 689 #ifdef CONFIG_KEXEC_CORE 690 { 691 .procname = "kexec_load_disabled", 692 .data = &kexec_load_disabled, 693 .maxlen = sizeof(int), 694 .mode = 0644, 695 /* only handle a transition from default "0" to "1" */ 696 .proc_handler = proc_dointvec_minmax, 697 .extra1 = SYSCTL_ONE, 698 .extra2 = SYSCTL_ONE, 699 }, 700 #endif 701 #ifdef CONFIG_MODULES 702 { 703 .procname = "modprobe", 704 .data = &modprobe_path, 705 .maxlen = KMOD_PATH_LEN, 706 .mode = 0644, 707 .proc_handler = proc_dostring, 708 }, 709 { 710 .procname = "modules_disabled", 711 .data = &modules_disabled, 712 .maxlen = sizeof(int), 713 .mode = 0644, 714 /* only handle a transition from default "0" to "1" */ 715 .proc_handler = proc_dointvec_minmax, 716 .extra1 = SYSCTL_ONE, 717 .extra2 = SYSCTL_ONE, 718 }, 719 #endif 720 #ifdef CONFIG_UEVENT_HELPER 721 { 722 .procname = "hotplug", 723 .data = &uevent_helper, 724 .maxlen = UEVENT_HELPER_PATH_LEN, 725 .mode = 0644, 726 .proc_handler = proc_dostring, 727 }, 728 #endif 729 #ifdef CONFIG_CHR_DEV_SG 730 { 731 .procname = "sg-big-buff", 732 .data = &sg_big_buff, 733 .maxlen = sizeof (int), 734 .mode = 0444, 735 .proc_handler = proc_dointvec, 736 }, 737 #endif 738 #ifdef CONFIG_BSD_PROCESS_ACCT 739 { 740 .procname = "acct", 741 .data = &acct_parm, 742 .maxlen = 3*sizeof(int), 743 .mode = 0644, 744 .proc_handler = proc_dointvec, 745 }, 746 #endif 747 #ifdef CONFIG_MAGIC_SYSRQ 748 { 749 .procname = "sysrq", 750 .data = &__sysrq_enabled, 751 .maxlen = sizeof (int), 752 .mode = 0644, 753 .proc_handler = sysrq_sysctl_handler, 754 }, 755 #endif 756 #ifdef CONFIG_PROC_SYSCTL 757 { 758 .procname = "cad_pid", 759 .data = NULL, 760 .maxlen = sizeof (int), 761 .mode = 0600, 762 .proc_handler = proc_do_cad_pid, 763 }, 764 #endif 765 { 766 .procname = "threads-max", 767 .data = NULL, 768 .maxlen = sizeof(int), 769 .mode = 0644, 770 .proc_handler = sysctl_max_threads, 771 }, 772 { 773 .procname = "random", 774 .mode = 0555, 775 .child = random_table, 776 }, 777 { 778 .procname = "usermodehelper", 779 .mode = 0555, 780 .child = usermodehelper_table, 781 }, 782 #ifdef CONFIG_FW_LOADER_USER_HELPER 783 { 784 .procname = "firmware_config", 785 .mode = 0555, 786 .child = firmware_config_table, 787 }, 788 #endif 789 { 790 .procname = "overflowuid", 791 .data = &overflowuid, 792 .maxlen = sizeof(int), 793 .mode = 0644, 794 .proc_handler = proc_dointvec_minmax, 795 .extra1 = &minolduid, 796 .extra2 = &maxolduid, 797 }, 798 { 799 .procname = "overflowgid", 800 .data = &overflowgid, 801 .maxlen = sizeof(int), 802 .mode = 0644, 803 .proc_handler = proc_dointvec_minmax, 804 .extra1 = &minolduid, 805 .extra2 = &maxolduid, 806 }, 807 #ifdef CONFIG_S390 808 #ifdef CONFIG_MATHEMU 809 { 810 .procname = "ieee_emulation_warnings", 811 .data = &sysctl_ieee_emulation_warnings, 812 .maxlen = sizeof(int), 813 .mode = 0644, 814 .proc_handler = proc_dointvec, 815 }, 816 #endif 817 { 818 .procname = "userprocess_debug", 819 .data = &show_unhandled_signals, 820 .maxlen = sizeof(int), 821 .mode = 0644, 822 .proc_handler = proc_dointvec, 823 }, 824 #endif 825 { 826 .procname = "pid_max", 827 .data = &pid_max, 828 .maxlen = sizeof (int), 829 .mode = 0644, 830 .proc_handler = proc_dointvec_minmax, 831 .extra1 = &pid_max_min, 832 .extra2 = &pid_max_max, 833 }, 834 { 835 .procname = "panic_on_oops", 836 .data = &panic_on_oops, 837 .maxlen = sizeof(int), 838 .mode = 0644, 839 .proc_handler = proc_dointvec, 840 }, 841 { 842 .procname = "panic_print", 843 .data = &panic_print, 844 .maxlen = sizeof(unsigned long), 845 .mode = 0644, 846 .proc_handler = proc_doulongvec_minmax, 847 }, 848 #if defined CONFIG_PRINTK 849 { 850 .procname = "printk", 851 .data = &console_loglevel, 852 .maxlen = 4*sizeof(int), 853 .mode = 0644, 854 .proc_handler = proc_dointvec, 855 }, 856 { 857 .procname = "printk_ratelimit", 858 .data = &printk_ratelimit_state.interval, 859 .maxlen = sizeof(int), 860 .mode = 0644, 861 .proc_handler = proc_dointvec_jiffies, 862 }, 863 { 864 .procname = "printk_ratelimit_burst", 865 .data = &printk_ratelimit_state.burst, 866 .maxlen = sizeof(int), 867 .mode = 0644, 868 .proc_handler = proc_dointvec, 869 }, 870 { 871 .procname = "printk_delay", 872 .data = &printk_delay_msec, 873 .maxlen = sizeof(int), 874 .mode = 0644, 875 .proc_handler = proc_dointvec_minmax, 876 .extra1 = SYSCTL_ZERO, 877 .extra2 = &ten_thousand, 878 }, 879 { 880 .procname = "printk_devkmsg", 881 .data = devkmsg_log_str, 882 .maxlen = DEVKMSG_STR_MAX_SIZE, 883 .mode = 0644, 884 .proc_handler = devkmsg_sysctl_set_loglvl, 885 }, 886 { 887 .procname = "dmesg_restrict", 888 .data = &dmesg_restrict, 889 .maxlen = sizeof(int), 890 .mode = 0644, 891 .proc_handler = proc_dointvec_minmax_sysadmin, 892 .extra1 = SYSCTL_ZERO, 893 .extra2 = SYSCTL_ONE, 894 }, 895 { 896 .procname = "kptr_restrict", 897 .data = &kptr_restrict, 898 .maxlen = sizeof(int), 899 .mode = 0644, 900 .proc_handler = proc_dointvec_minmax_sysadmin, 901 .extra1 = SYSCTL_ZERO, 902 .extra2 = &two, 903 }, 904 #endif 905 { 906 .procname = "ngroups_max", 907 .data = &ngroups_max, 908 .maxlen = sizeof (int), 909 .mode = 0444, 910 .proc_handler = proc_dointvec, 911 }, 912 { 913 .procname = "cap_last_cap", 914 .data = (void *)&cap_last_cap, 915 .maxlen = sizeof(int), 916 .mode = 0444, 917 .proc_handler = proc_dointvec, 918 }, 919 #if defined(CONFIG_LOCKUP_DETECTOR) 920 { 921 .procname = "watchdog", 922 .data = &watchdog_user_enabled, 923 .maxlen = sizeof(int), 924 .mode = 0644, 925 .proc_handler = proc_watchdog, 926 .extra1 = SYSCTL_ZERO, 927 .extra2 = SYSCTL_ONE, 928 }, 929 { 930 .procname = "watchdog_thresh", 931 .data = &watchdog_thresh, 932 .maxlen = sizeof(int), 933 .mode = 0644, 934 .proc_handler = proc_watchdog_thresh, 935 .extra1 = SYSCTL_ZERO, 936 .extra2 = &sixty, 937 }, 938 { 939 .procname = "nmi_watchdog", 940 .data = &nmi_watchdog_user_enabled, 941 .maxlen = sizeof(int), 942 .mode = NMI_WATCHDOG_SYSCTL_PERM, 943 .proc_handler = proc_nmi_watchdog, 944 .extra1 = SYSCTL_ZERO, 945 .extra2 = SYSCTL_ONE, 946 }, 947 { 948 .procname = "watchdog_cpumask", 949 .data = &watchdog_cpumask_bits, 950 .maxlen = NR_CPUS, 951 .mode = 0644, 952 .proc_handler = proc_watchdog_cpumask, 953 }, 954 #ifdef CONFIG_SOFTLOCKUP_DETECTOR 955 { 956 .procname = "soft_watchdog", 957 .data = &soft_watchdog_user_enabled, 958 .maxlen = sizeof(int), 959 .mode = 0644, 960 .proc_handler = proc_soft_watchdog, 961 .extra1 = SYSCTL_ZERO, 962 .extra2 = SYSCTL_ONE, 963 }, 964 { 965 .procname = "softlockup_panic", 966 .data = &softlockup_panic, 967 .maxlen = sizeof(int), 968 .mode = 0644, 969 .proc_handler = proc_dointvec_minmax, 970 .extra1 = SYSCTL_ZERO, 971 .extra2 = SYSCTL_ONE, 972 }, 973 #ifdef CONFIG_SMP 974 { 975 .procname = "softlockup_all_cpu_backtrace", 976 .data = &sysctl_softlockup_all_cpu_backtrace, 977 .maxlen = sizeof(int), 978 .mode = 0644, 979 .proc_handler = proc_dointvec_minmax, 980 .extra1 = SYSCTL_ZERO, 981 .extra2 = SYSCTL_ONE, 982 }, 983 #endif /* CONFIG_SMP */ 984 #endif 985 #ifdef CONFIG_HARDLOCKUP_DETECTOR 986 { 987 .procname = "hardlockup_panic", 988 .data = &hardlockup_panic, 989 .maxlen = sizeof(int), 990 .mode = 0644, 991 .proc_handler = proc_dointvec_minmax, 992 .extra1 = SYSCTL_ZERO, 993 .extra2 = SYSCTL_ONE, 994 }, 995 #ifdef CONFIG_SMP 996 { 997 .procname = "hardlockup_all_cpu_backtrace", 998 .data = &sysctl_hardlockup_all_cpu_backtrace, 999 .maxlen = sizeof(int), 1000 .mode = 0644, 1001 .proc_handler = proc_dointvec_minmax, 1002 .extra1 = SYSCTL_ZERO, 1003 .extra2 = SYSCTL_ONE, 1004 }, 1005 #endif /* CONFIG_SMP */ 1006 #endif 1007 #endif 1008 1009 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 1010 { 1011 .procname = "unknown_nmi_panic", 1012 .data = &unknown_nmi_panic, 1013 .maxlen = sizeof (int), 1014 .mode = 0644, 1015 .proc_handler = proc_dointvec, 1016 }, 1017 #endif 1018 #if defined(CONFIG_X86) 1019 { 1020 .procname = "panic_on_unrecovered_nmi", 1021 .data = &panic_on_unrecovered_nmi, 1022 .maxlen = sizeof(int), 1023 .mode = 0644, 1024 .proc_handler = proc_dointvec, 1025 }, 1026 { 1027 .procname = "panic_on_io_nmi", 1028 .data = &panic_on_io_nmi, 1029 .maxlen = sizeof(int), 1030 .mode = 0644, 1031 .proc_handler = proc_dointvec, 1032 }, 1033 #ifdef CONFIG_DEBUG_STACKOVERFLOW 1034 { 1035 .procname = "panic_on_stackoverflow", 1036 .data = &sysctl_panic_on_stackoverflow, 1037 .maxlen = sizeof(int), 1038 .mode = 0644, 1039 .proc_handler = proc_dointvec, 1040 }, 1041 #endif 1042 { 1043 .procname = "bootloader_type", 1044 .data = &bootloader_type, 1045 .maxlen = sizeof (int), 1046 .mode = 0444, 1047 .proc_handler = proc_dointvec, 1048 }, 1049 { 1050 .procname = "bootloader_version", 1051 .data = &bootloader_version, 1052 .maxlen = sizeof (int), 1053 .mode = 0444, 1054 .proc_handler = proc_dointvec, 1055 }, 1056 { 1057 .procname = "io_delay_type", 1058 .data = &io_delay_type, 1059 .maxlen = sizeof(int), 1060 .mode = 0644, 1061 .proc_handler = proc_dointvec, 1062 }, 1063 #endif 1064 #if defined(CONFIG_MMU) 1065 { 1066 .procname = "randomize_va_space", 1067 .data = &randomize_va_space, 1068 .maxlen = sizeof(int), 1069 .mode = 0644, 1070 .proc_handler = proc_dointvec, 1071 }, 1072 #endif 1073 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1074 { 1075 .procname = "spin_retry", 1076 .data = &spin_retry, 1077 .maxlen = sizeof (int), 1078 .mode = 0644, 1079 .proc_handler = proc_dointvec, 1080 }, 1081 #endif 1082 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1083 { 1084 .procname = "acpi_video_flags", 1085 .data = &acpi_realmode_flags, 1086 .maxlen = sizeof (unsigned long), 1087 .mode = 0644, 1088 .proc_handler = proc_doulongvec_minmax, 1089 }, 1090 #endif 1091 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1092 { 1093 .procname = "ignore-unaligned-usertrap", 1094 .data = &no_unaligned_warning, 1095 .maxlen = sizeof (int), 1096 .mode = 0644, 1097 .proc_handler = proc_dointvec, 1098 }, 1099 #endif 1100 #ifdef CONFIG_IA64 1101 { 1102 .procname = "unaligned-dump-stack", 1103 .data = &unaligned_dump_stack, 1104 .maxlen = sizeof (int), 1105 .mode = 0644, 1106 .proc_handler = proc_dointvec, 1107 }, 1108 #endif 1109 #ifdef CONFIG_DETECT_HUNG_TASK 1110 { 1111 .procname = "hung_task_panic", 1112 .data = &sysctl_hung_task_panic, 1113 .maxlen = sizeof(int), 1114 .mode = 0644, 1115 .proc_handler = proc_dointvec_minmax, 1116 .extra1 = SYSCTL_ZERO, 1117 .extra2 = SYSCTL_ONE, 1118 }, 1119 { 1120 .procname = "hung_task_check_count", 1121 .data = &sysctl_hung_task_check_count, 1122 .maxlen = sizeof(int), 1123 .mode = 0644, 1124 .proc_handler = proc_dointvec_minmax, 1125 .extra1 = SYSCTL_ZERO, 1126 }, 1127 { 1128 .procname = "hung_task_timeout_secs", 1129 .data = &sysctl_hung_task_timeout_secs, 1130 .maxlen = sizeof(unsigned long), 1131 .mode = 0644, 1132 .proc_handler = proc_dohung_task_timeout_secs, 1133 .extra2 = &hung_task_timeout_max, 1134 }, 1135 { 1136 .procname = "hung_task_check_interval_secs", 1137 .data = &sysctl_hung_task_check_interval_secs, 1138 .maxlen = sizeof(unsigned long), 1139 .mode = 0644, 1140 .proc_handler = proc_dohung_task_timeout_secs, 1141 .extra2 = &hung_task_timeout_max, 1142 }, 1143 { 1144 .procname = "hung_task_warnings", 1145 .data = &sysctl_hung_task_warnings, 1146 .maxlen = sizeof(int), 1147 .mode = 0644, 1148 .proc_handler = proc_dointvec_minmax, 1149 .extra1 = &neg_one, 1150 }, 1151 #endif 1152 #ifdef CONFIG_RT_MUTEXES 1153 { 1154 .procname = "max_lock_depth", 1155 .data = &max_lock_depth, 1156 .maxlen = sizeof(int), 1157 .mode = 0644, 1158 .proc_handler = proc_dointvec, 1159 }, 1160 #endif 1161 { 1162 .procname = "poweroff_cmd", 1163 .data = &poweroff_cmd, 1164 .maxlen = POWEROFF_CMD_PATH_LEN, 1165 .mode = 0644, 1166 .proc_handler = proc_dostring, 1167 }, 1168 #ifdef CONFIG_KEYS 1169 { 1170 .procname = "keys", 1171 .mode = 0555, 1172 .child = key_sysctls, 1173 }, 1174 #endif 1175 #ifdef CONFIG_PERF_EVENTS 1176 /* 1177 * User-space scripts rely on the existence of this file 1178 * as a feature check for perf_events being enabled. 1179 * 1180 * So it's an ABI, do not remove! 1181 */ 1182 { 1183 .procname = "perf_event_paranoid", 1184 .data = &sysctl_perf_event_paranoid, 1185 .maxlen = sizeof(sysctl_perf_event_paranoid), 1186 .mode = 0644, 1187 .proc_handler = proc_dointvec, 1188 }, 1189 { 1190 .procname = "perf_event_mlock_kb", 1191 .data = &sysctl_perf_event_mlock, 1192 .maxlen = sizeof(sysctl_perf_event_mlock), 1193 .mode = 0644, 1194 .proc_handler = proc_dointvec, 1195 }, 1196 { 1197 .procname = "perf_event_max_sample_rate", 1198 .data = &sysctl_perf_event_sample_rate, 1199 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1200 .mode = 0644, 1201 .proc_handler = perf_proc_update_handler, 1202 .extra1 = SYSCTL_ONE, 1203 }, 1204 { 1205 .procname = "perf_cpu_time_max_percent", 1206 .data = &sysctl_perf_cpu_time_max_percent, 1207 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1208 .mode = 0644, 1209 .proc_handler = perf_cpu_time_max_percent_handler, 1210 .extra1 = SYSCTL_ZERO, 1211 .extra2 = &one_hundred, 1212 }, 1213 { 1214 .procname = "perf_event_max_stack", 1215 .data = &sysctl_perf_event_max_stack, 1216 .maxlen = sizeof(sysctl_perf_event_max_stack), 1217 .mode = 0644, 1218 .proc_handler = perf_event_max_stack_handler, 1219 .extra1 = SYSCTL_ZERO, 1220 .extra2 = &six_hundred_forty_kb, 1221 }, 1222 { 1223 .procname = "perf_event_max_contexts_per_stack", 1224 .data = &sysctl_perf_event_max_contexts_per_stack, 1225 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1226 .mode = 0644, 1227 .proc_handler = perf_event_max_stack_handler, 1228 .extra1 = SYSCTL_ZERO, 1229 .extra2 = &one_thousand, 1230 }, 1231 #endif 1232 { 1233 .procname = "panic_on_warn", 1234 .data = &panic_on_warn, 1235 .maxlen = sizeof(int), 1236 .mode = 0644, 1237 .proc_handler = proc_dointvec_minmax, 1238 .extra1 = SYSCTL_ZERO, 1239 .extra2 = SYSCTL_ONE, 1240 }, 1241 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1242 { 1243 .procname = "timer_migration", 1244 .data = &sysctl_timer_migration, 1245 .maxlen = sizeof(unsigned int), 1246 .mode = 0644, 1247 .proc_handler = timer_migration_handler, 1248 .extra1 = SYSCTL_ZERO, 1249 .extra2 = SYSCTL_ONE, 1250 }, 1251 #endif 1252 #ifdef CONFIG_BPF_SYSCALL 1253 { 1254 .procname = "unprivileged_bpf_disabled", 1255 .data = &sysctl_unprivileged_bpf_disabled, 1256 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1257 .mode = 0644, 1258 /* only handle a transition from default "0" to "1" */ 1259 .proc_handler = proc_dointvec_minmax, 1260 .extra1 = SYSCTL_ONE, 1261 .extra2 = SYSCTL_ONE, 1262 }, 1263 { 1264 .procname = "bpf_stats_enabled", 1265 .data = &bpf_stats_enabled_key.key, 1266 .maxlen = sizeof(bpf_stats_enabled_key), 1267 .mode = 0644, 1268 .proc_handler = proc_do_static_key, 1269 }, 1270 #endif 1271 #if defined(CONFIG_TREE_RCU) 1272 { 1273 .procname = "panic_on_rcu_stall", 1274 .data = &sysctl_panic_on_rcu_stall, 1275 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1276 .mode = 0644, 1277 .proc_handler = proc_dointvec_minmax, 1278 .extra1 = SYSCTL_ZERO, 1279 .extra2 = SYSCTL_ONE, 1280 }, 1281 #endif 1282 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE 1283 { 1284 .procname = "stack_erasing", 1285 .data = NULL, 1286 .maxlen = sizeof(int), 1287 .mode = 0600, 1288 .proc_handler = stack_erasing_sysctl, 1289 .extra1 = SYSCTL_ZERO, 1290 .extra2 = SYSCTL_ONE, 1291 }, 1292 #endif 1293 { } 1294 }; 1295 1296 static struct ctl_table vm_table[] = { 1297 { 1298 .procname = "overcommit_memory", 1299 .data = &sysctl_overcommit_memory, 1300 .maxlen = sizeof(sysctl_overcommit_memory), 1301 .mode = 0644, 1302 .proc_handler = proc_dointvec_minmax, 1303 .extra1 = SYSCTL_ZERO, 1304 .extra2 = &two, 1305 }, 1306 { 1307 .procname = "panic_on_oom", 1308 .data = &sysctl_panic_on_oom, 1309 .maxlen = sizeof(sysctl_panic_on_oom), 1310 .mode = 0644, 1311 .proc_handler = proc_dointvec_minmax, 1312 .extra1 = SYSCTL_ZERO, 1313 .extra2 = &two, 1314 }, 1315 { 1316 .procname = "oom_kill_allocating_task", 1317 .data = &sysctl_oom_kill_allocating_task, 1318 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1319 .mode = 0644, 1320 .proc_handler = proc_dointvec, 1321 }, 1322 { 1323 .procname = "oom_dump_tasks", 1324 .data = &sysctl_oom_dump_tasks, 1325 .maxlen = sizeof(sysctl_oom_dump_tasks), 1326 .mode = 0644, 1327 .proc_handler = proc_dointvec, 1328 }, 1329 { 1330 .procname = "overcommit_ratio", 1331 .data = &sysctl_overcommit_ratio, 1332 .maxlen = sizeof(sysctl_overcommit_ratio), 1333 .mode = 0644, 1334 .proc_handler = overcommit_ratio_handler, 1335 }, 1336 { 1337 .procname = "overcommit_kbytes", 1338 .data = &sysctl_overcommit_kbytes, 1339 .maxlen = sizeof(sysctl_overcommit_kbytes), 1340 .mode = 0644, 1341 .proc_handler = overcommit_kbytes_handler, 1342 }, 1343 { 1344 .procname = "page-cluster", 1345 .data = &page_cluster, 1346 .maxlen = sizeof(int), 1347 .mode = 0644, 1348 .proc_handler = proc_dointvec_minmax, 1349 .extra1 = SYSCTL_ZERO, 1350 }, 1351 { 1352 .procname = "dirty_background_ratio", 1353 .data = &dirty_background_ratio, 1354 .maxlen = sizeof(dirty_background_ratio), 1355 .mode = 0644, 1356 .proc_handler = dirty_background_ratio_handler, 1357 .extra1 = SYSCTL_ZERO, 1358 .extra2 = &one_hundred, 1359 }, 1360 { 1361 .procname = "dirty_background_bytes", 1362 .data = &dirty_background_bytes, 1363 .maxlen = sizeof(dirty_background_bytes), 1364 .mode = 0644, 1365 .proc_handler = dirty_background_bytes_handler, 1366 .extra1 = &one_ul, 1367 }, 1368 { 1369 .procname = "dirty_ratio", 1370 .data = &vm_dirty_ratio, 1371 .maxlen = sizeof(vm_dirty_ratio), 1372 .mode = 0644, 1373 .proc_handler = dirty_ratio_handler, 1374 .extra1 = SYSCTL_ZERO, 1375 .extra2 = &one_hundred, 1376 }, 1377 { 1378 .procname = "dirty_bytes", 1379 .data = &vm_dirty_bytes, 1380 .maxlen = sizeof(vm_dirty_bytes), 1381 .mode = 0644, 1382 .proc_handler = dirty_bytes_handler, 1383 .extra1 = &dirty_bytes_min, 1384 }, 1385 { 1386 .procname = "dirty_writeback_centisecs", 1387 .data = &dirty_writeback_interval, 1388 .maxlen = sizeof(dirty_writeback_interval), 1389 .mode = 0644, 1390 .proc_handler = dirty_writeback_centisecs_handler, 1391 }, 1392 { 1393 .procname = "dirty_expire_centisecs", 1394 .data = &dirty_expire_interval, 1395 .maxlen = sizeof(dirty_expire_interval), 1396 .mode = 0644, 1397 .proc_handler = proc_dointvec_minmax, 1398 .extra1 = SYSCTL_ZERO, 1399 }, 1400 { 1401 .procname = "dirtytime_expire_seconds", 1402 .data = &dirtytime_expire_interval, 1403 .maxlen = sizeof(dirtytime_expire_interval), 1404 .mode = 0644, 1405 .proc_handler = dirtytime_interval_handler, 1406 .extra1 = SYSCTL_ZERO, 1407 }, 1408 { 1409 .procname = "swappiness", 1410 .data = &vm_swappiness, 1411 .maxlen = sizeof(vm_swappiness), 1412 .mode = 0644, 1413 .proc_handler = proc_dointvec_minmax, 1414 .extra1 = SYSCTL_ZERO, 1415 .extra2 = &one_hundred, 1416 }, 1417 #ifdef CONFIG_HUGETLB_PAGE 1418 { 1419 .procname = "nr_hugepages", 1420 .data = NULL, 1421 .maxlen = sizeof(unsigned long), 1422 .mode = 0644, 1423 .proc_handler = hugetlb_sysctl_handler, 1424 }, 1425 #ifdef CONFIG_NUMA 1426 { 1427 .procname = "nr_hugepages_mempolicy", 1428 .data = NULL, 1429 .maxlen = sizeof(unsigned long), 1430 .mode = 0644, 1431 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1432 }, 1433 { 1434 .procname = "numa_stat", 1435 .data = &sysctl_vm_numa_stat, 1436 .maxlen = sizeof(int), 1437 .mode = 0644, 1438 .proc_handler = sysctl_vm_numa_stat_handler, 1439 .extra1 = SYSCTL_ZERO, 1440 .extra2 = SYSCTL_ONE, 1441 }, 1442 #endif 1443 { 1444 .procname = "hugetlb_shm_group", 1445 .data = &sysctl_hugetlb_shm_group, 1446 .maxlen = sizeof(gid_t), 1447 .mode = 0644, 1448 .proc_handler = proc_dointvec, 1449 }, 1450 { 1451 .procname = "nr_overcommit_hugepages", 1452 .data = NULL, 1453 .maxlen = sizeof(unsigned long), 1454 .mode = 0644, 1455 .proc_handler = hugetlb_overcommit_handler, 1456 }, 1457 #endif 1458 { 1459 .procname = "lowmem_reserve_ratio", 1460 .data = &sysctl_lowmem_reserve_ratio, 1461 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1462 .mode = 0644, 1463 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1464 }, 1465 { 1466 .procname = "drop_caches", 1467 .data = &sysctl_drop_caches, 1468 .maxlen = sizeof(int), 1469 .mode = 0200, 1470 .proc_handler = drop_caches_sysctl_handler, 1471 .extra1 = SYSCTL_ONE, 1472 .extra2 = &four, 1473 }, 1474 #ifdef CONFIG_COMPACTION 1475 { 1476 .procname = "compact_memory", 1477 .data = &sysctl_compact_memory, 1478 .maxlen = sizeof(int), 1479 .mode = 0200, 1480 .proc_handler = sysctl_compaction_handler, 1481 }, 1482 { 1483 .procname = "extfrag_threshold", 1484 .data = &sysctl_extfrag_threshold, 1485 .maxlen = sizeof(int), 1486 .mode = 0644, 1487 .proc_handler = proc_dointvec_minmax, 1488 .extra1 = &min_extfrag_threshold, 1489 .extra2 = &max_extfrag_threshold, 1490 }, 1491 { 1492 .procname = "compact_unevictable_allowed", 1493 .data = &sysctl_compact_unevictable_allowed, 1494 .maxlen = sizeof(int), 1495 .mode = 0644, 1496 .proc_handler = proc_dointvec, 1497 .extra1 = SYSCTL_ZERO, 1498 .extra2 = SYSCTL_ONE, 1499 }, 1500 1501 #endif /* CONFIG_COMPACTION */ 1502 { 1503 .procname = "min_free_kbytes", 1504 .data = &min_free_kbytes, 1505 .maxlen = sizeof(min_free_kbytes), 1506 .mode = 0644, 1507 .proc_handler = min_free_kbytes_sysctl_handler, 1508 .extra1 = SYSCTL_ZERO, 1509 }, 1510 { 1511 .procname = "watermark_boost_factor", 1512 .data = &watermark_boost_factor, 1513 .maxlen = sizeof(watermark_boost_factor), 1514 .mode = 0644, 1515 .proc_handler = watermark_boost_factor_sysctl_handler, 1516 .extra1 = SYSCTL_ZERO, 1517 }, 1518 { 1519 .procname = "watermark_scale_factor", 1520 .data = &watermark_scale_factor, 1521 .maxlen = sizeof(watermark_scale_factor), 1522 .mode = 0644, 1523 .proc_handler = watermark_scale_factor_sysctl_handler, 1524 .extra1 = SYSCTL_ONE, 1525 .extra2 = &one_thousand, 1526 }, 1527 { 1528 .procname = "percpu_pagelist_fraction", 1529 .data = &percpu_pagelist_fraction, 1530 .maxlen = sizeof(percpu_pagelist_fraction), 1531 .mode = 0644, 1532 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1533 .extra1 = SYSCTL_ZERO, 1534 }, 1535 #ifdef CONFIG_MMU 1536 { 1537 .procname = "max_map_count", 1538 .data = &sysctl_max_map_count, 1539 .maxlen = sizeof(sysctl_max_map_count), 1540 .mode = 0644, 1541 .proc_handler = proc_dointvec_minmax, 1542 .extra1 = SYSCTL_ZERO, 1543 }, 1544 #else 1545 { 1546 .procname = "nr_trim_pages", 1547 .data = &sysctl_nr_trim_pages, 1548 .maxlen = sizeof(sysctl_nr_trim_pages), 1549 .mode = 0644, 1550 .proc_handler = proc_dointvec_minmax, 1551 .extra1 = SYSCTL_ZERO, 1552 }, 1553 #endif 1554 { 1555 .procname = "laptop_mode", 1556 .data = &laptop_mode, 1557 .maxlen = sizeof(laptop_mode), 1558 .mode = 0644, 1559 .proc_handler = proc_dointvec_jiffies, 1560 }, 1561 { 1562 .procname = "block_dump", 1563 .data = &block_dump, 1564 .maxlen = sizeof(block_dump), 1565 .mode = 0644, 1566 .proc_handler = proc_dointvec, 1567 .extra1 = SYSCTL_ZERO, 1568 }, 1569 { 1570 .procname = "vfs_cache_pressure", 1571 .data = &sysctl_vfs_cache_pressure, 1572 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1573 .mode = 0644, 1574 .proc_handler = proc_dointvec, 1575 .extra1 = SYSCTL_ZERO, 1576 }, 1577 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ 1578 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) 1579 { 1580 .procname = "legacy_va_layout", 1581 .data = &sysctl_legacy_va_layout, 1582 .maxlen = sizeof(sysctl_legacy_va_layout), 1583 .mode = 0644, 1584 .proc_handler = proc_dointvec, 1585 .extra1 = SYSCTL_ZERO, 1586 }, 1587 #endif 1588 #ifdef CONFIG_NUMA 1589 { 1590 .procname = "zone_reclaim_mode", 1591 .data = &node_reclaim_mode, 1592 .maxlen = sizeof(node_reclaim_mode), 1593 .mode = 0644, 1594 .proc_handler = proc_dointvec, 1595 .extra1 = SYSCTL_ZERO, 1596 }, 1597 { 1598 .procname = "min_unmapped_ratio", 1599 .data = &sysctl_min_unmapped_ratio, 1600 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1601 .mode = 0644, 1602 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1603 .extra1 = SYSCTL_ZERO, 1604 .extra2 = &one_hundred, 1605 }, 1606 { 1607 .procname = "min_slab_ratio", 1608 .data = &sysctl_min_slab_ratio, 1609 .maxlen = sizeof(sysctl_min_slab_ratio), 1610 .mode = 0644, 1611 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1612 .extra1 = SYSCTL_ZERO, 1613 .extra2 = &one_hundred, 1614 }, 1615 #endif 1616 #ifdef CONFIG_SMP 1617 { 1618 .procname = "stat_interval", 1619 .data = &sysctl_stat_interval, 1620 .maxlen = sizeof(sysctl_stat_interval), 1621 .mode = 0644, 1622 .proc_handler = proc_dointvec_jiffies, 1623 }, 1624 { 1625 .procname = "stat_refresh", 1626 .data = NULL, 1627 .maxlen = 0, 1628 .mode = 0600, 1629 .proc_handler = vmstat_refresh, 1630 }, 1631 #endif 1632 #ifdef CONFIG_MMU 1633 { 1634 .procname = "mmap_min_addr", 1635 .data = &dac_mmap_min_addr, 1636 .maxlen = sizeof(unsigned long), 1637 .mode = 0644, 1638 .proc_handler = mmap_min_addr_handler, 1639 }, 1640 #endif 1641 #ifdef CONFIG_NUMA 1642 { 1643 .procname = "numa_zonelist_order", 1644 .data = &numa_zonelist_order, 1645 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1646 .mode = 0644, 1647 .proc_handler = numa_zonelist_order_handler, 1648 }, 1649 #endif 1650 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1651 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1652 { 1653 .procname = "vdso_enabled", 1654 #ifdef CONFIG_X86_32 1655 .data = &vdso32_enabled, 1656 .maxlen = sizeof(vdso32_enabled), 1657 #else 1658 .data = &vdso_enabled, 1659 .maxlen = sizeof(vdso_enabled), 1660 #endif 1661 .mode = 0644, 1662 .proc_handler = proc_dointvec, 1663 .extra1 = SYSCTL_ZERO, 1664 }, 1665 #endif 1666 #ifdef CONFIG_HIGHMEM 1667 { 1668 .procname = "highmem_is_dirtyable", 1669 .data = &vm_highmem_is_dirtyable, 1670 .maxlen = sizeof(vm_highmem_is_dirtyable), 1671 .mode = 0644, 1672 .proc_handler = proc_dointvec_minmax, 1673 .extra1 = SYSCTL_ZERO, 1674 .extra2 = SYSCTL_ONE, 1675 }, 1676 #endif 1677 #ifdef CONFIG_MEMORY_FAILURE 1678 { 1679 .procname = "memory_failure_early_kill", 1680 .data = &sysctl_memory_failure_early_kill, 1681 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1682 .mode = 0644, 1683 .proc_handler = proc_dointvec_minmax, 1684 .extra1 = SYSCTL_ZERO, 1685 .extra2 = SYSCTL_ONE, 1686 }, 1687 { 1688 .procname = "memory_failure_recovery", 1689 .data = &sysctl_memory_failure_recovery, 1690 .maxlen = sizeof(sysctl_memory_failure_recovery), 1691 .mode = 0644, 1692 .proc_handler = proc_dointvec_minmax, 1693 .extra1 = SYSCTL_ZERO, 1694 .extra2 = SYSCTL_ONE, 1695 }, 1696 #endif 1697 { 1698 .procname = "user_reserve_kbytes", 1699 .data = &sysctl_user_reserve_kbytes, 1700 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1701 .mode = 0644, 1702 .proc_handler = proc_doulongvec_minmax, 1703 }, 1704 { 1705 .procname = "admin_reserve_kbytes", 1706 .data = &sysctl_admin_reserve_kbytes, 1707 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1708 .mode = 0644, 1709 .proc_handler = proc_doulongvec_minmax, 1710 }, 1711 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1712 { 1713 .procname = "mmap_rnd_bits", 1714 .data = &mmap_rnd_bits, 1715 .maxlen = sizeof(mmap_rnd_bits), 1716 .mode = 0600, 1717 .proc_handler = proc_dointvec_minmax, 1718 .extra1 = (void *)&mmap_rnd_bits_min, 1719 .extra2 = (void *)&mmap_rnd_bits_max, 1720 }, 1721 #endif 1722 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1723 { 1724 .procname = "mmap_rnd_compat_bits", 1725 .data = &mmap_rnd_compat_bits, 1726 .maxlen = sizeof(mmap_rnd_compat_bits), 1727 .mode = 0600, 1728 .proc_handler = proc_dointvec_minmax, 1729 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1730 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1731 }, 1732 #endif 1733 #ifdef CONFIG_USERFAULTFD 1734 { 1735 .procname = "unprivileged_userfaultfd", 1736 .data = &sysctl_unprivileged_userfaultfd, 1737 .maxlen = sizeof(sysctl_unprivileged_userfaultfd), 1738 .mode = 0644, 1739 .proc_handler = proc_dointvec_minmax, 1740 .extra1 = SYSCTL_ZERO, 1741 .extra2 = SYSCTL_ONE, 1742 }, 1743 #endif 1744 { } 1745 }; 1746 1747 static struct ctl_table fs_table[] = { 1748 { 1749 .procname = "inode-nr", 1750 .data = &inodes_stat, 1751 .maxlen = 2*sizeof(long), 1752 .mode = 0444, 1753 .proc_handler = proc_nr_inodes, 1754 }, 1755 { 1756 .procname = "inode-state", 1757 .data = &inodes_stat, 1758 .maxlen = 7*sizeof(long), 1759 .mode = 0444, 1760 .proc_handler = proc_nr_inodes, 1761 }, 1762 { 1763 .procname = "file-nr", 1764 .data = &files_stat, 1765 .maxlen = sizeof(files_stat), 1766 .mode = 0444, 1767 .proc_handler = proc_nr_files, 1768 }, 1769 { 1770 .procname = "file-max", 1771 .data = &files_stat.max_files, 1772 .maxlen = sizeof(files_stat.max_files), 1773 .mode = 0644, 1774 .proc_handler = proc_doulongvec_minmax, 1775 .extra1 = &zero_ul, 1776 .extra2 = &long_max, 1777 }, 1778 { 1779 .procname = "nr_open", 1780 .data = &sysctl_nr_open, 1781 .maxlen = sizeof(unsigned int), 1782 .mode = 0644, 1783 .proc_handler = proc_dointvec_minmax, 1784 .extra1 = &sysctl_nr_open_min, 1785 .extra2 = &sysctl_nr_open_max, 1786 }, 1787 { 1788 .procname = "dentry-state", 1789 .data = &dentry_stat, 1790 .maxlen = 6*sizeof(long), 1791 .mode = 0444, 1792 .proc_handler = proc_nr_dentry, 1793 }, 1794 { 1795 .procname = "overflowuid", 1796 .data = &fs_overflowuid, 1797 .maxlen = sizeof(int), 1798 .mode = 0644, 1799 .proc_handler = proc_dointvec_minmax, 1800 .extra1 = &minolduid, 1801 .extra2 = &maxolduid, 1802 }, 1803 { 1804 .procname = "overflowgid", 1805 .data = &fs_overflowgid, 1806 .maxlen = sizeof(int), 1807 .mode = 0644, 1808 .proc_handler = proc_dointvec_minmax, 1809 .extra1 = &minolduid, 1810 .extra2 = &maxolduid, 1811 }, 1812 #ifdef CONFIG_FILE_LOCKING 1813 { 1814 .procname = "leases-enable", 1815 .data = &leases_enable, 1816 .maxlen = sizeof(int), 1817 .mode = 0644, 1818 .proc_handler = proc_dointvec, 1819 }, 1820 #endif 1821 #ifdef CONFIG_DNOTIFY 1822 { 1823 .procname = "dir-notify-enable", 1824 .data = &dir_notify_enable, 1825 .maxlen = sizeof(int), 1826 .mode = 0644, 1827 .proc_handler = proc_dointvec, 1828 }, 1829 #endif 1830 #ifdef CONFIG_MMU 1831 #ifdef CONFIG_FILE_LOCKING 1832 { 1833 .procname = "lease-break-time", 1834 .data = &lease_break_time, 1835 .maxlen = sizeof(int), 1836 .mode = 0644, 1837 .proc_handler = proc_dointvec, 1838 }, 1839 #endif 1840 #ifdef CONFIG_AIO 1841 { 1842 .procname = "aio-nr", 1843 .data = &aio_nr, 1844 .maxlen = sizeof(aio_nr), 1845 .mode = 0444, 1846 .proc_handler = proc_doulongvec_minmax, 1847 }, 1848 { 1849 .procname = "aio-max-nr", 1850 .data = &aio_max_nr, 1851 .maxlen = sizeof(aio_max_nr), 1852 .mode = 0644, 1853 .proc_handler = proc_doulongvec_minmax, 1854 }, 1855 #endif /* CONFIG_AIO */ 1856 #ifdef CONFIG_INOTIFY_USER 1857 { 1858 .procname = "inotify", 1859 .mode = 0555, 1860 .child = inotify_table, 1861 }, 1862 #endif 1863 #ifdef CONFIG_EPOLL 1864 { 1865 .procname = "epoll", 1866 .mode = 0555, 1867 .child = epoll_table, 1868 }, 1869 #endif 1870 #endif 1871 { 1872 .procname = "protected_symlinks", 1873 .data = &sysctl_protected_symlinks, 1874 .maxlen = sizeof(int), 1875 .mode = 0600, 1876 .proc_handler = proc_dointvec_minmax, 1877 .extra1 = SYSCTL_ZERO, 1878 .extra2 = SYSCTL_ONE, 1879 }, 1880 { 1881 .procname = "protected_hardlinks", 1882 .data = &sysctl_protected_hardlinks, 1883 .maxlen = sizeof(int), 1884 .mode = 0600, 1885 .proc_handler = proc_dointvec_minmax, 1886 .extra1 = SYSCTL_ZERO, 1887 .extra2 = SYSCTL_ONE, 1888 }, 1889 { 1890 .procname = "protected_fifos", 1891 .data = &sysctl_protected_fifos, 1892 .maxlen = sizeof(int), 1893 .mode = 0600, 1894 .proc_handler = proc_dointvec_minmax, 1895 .extra1 = SYSCTL_ZERO, 1896 .extra2 = &two, 1897 }, 1898 { 1899 .procname = "protected_regular", 1900 .data = &sysctl_protected_regular, 1901 .maxlen = sizeof(int), 1902 .mode = 0600, 1903 .proc_handler = proc_dointvec_minmax, 1904 .extra1 = SYSCTL_ZERO, 1905 .extra2 = &two, 1906 }, 1907 { 1908 .procname = "suid_dumpable", 1909 .data = &suid_dumpable, 1910 .maxlen = sizeof(int), 1911 .mode = 0644, 1912 .proc_handler = proc_dointvec_minmax_coredump, 1913 .extra1 = SYSCTL_ZERO, 1914 .extra2 = &two, 1915 }, 1916 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1917 { 1918 .procname = "binfmt_misc", 1919 .mode = 0555, 1920 .child = sysctl_mount_point, 1921 }, 1922 #endif 1923 { 1924 .procname = "pipe-max-size", 1925 .data = &pipe_max_size, 1926 .maxlen = sizeof(pipe_max_size), 1927 .mode = 0644, 1928 .proc_handler = proc_dopipe_max_size, 1929 }, 1930 { 1931 .procname = "pipe-user-pages-hard", 1932 .data = &pipe_user_pages_hard, 1933 .maxlen = sizeof(pipe_user_pages_hard), 1934 .mode = 0644, 1935 .proc_handler = proc_doulongvec_minmax, 1936 }, 1937 { 1938 .procname = "pipe-user-pages-soft", 1939 .data = &pipe_user_pages_soft, 1940 .maxlen = sizeof(pipe_user_pages_soft), 1941 .mode = 0644, 1942 .proc_handler = proc_doulongvec_minmax, 1943 }, 1944 { 1945 .procname = "mount-max", 1946 .data = &sysctl_mount_max, 1947 .maxlen = sizeof(unsigned int), 1948 .mode = 0644, 1949 .proc_handler = proc_dointvec_minmax, 1950 .extra1 = SYSCTL_ONE, 1951 }, 1952 { } 1953 }; 1954 1955 static struct ctl_table debug_table[] = { 1956 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1957 { 1958 .procname = "exception-trace", 1959 .data = &show_unhandled_signals, 1960 .maxlen = sizeof(int), 1961 .mode = 0644, 1962 .proc_handler = proc_dointvec 1963 }, 1964 #endif 1965 #if defined(CONFIG_OPTPROBES) 1966 { 1967 .procname = "kprobes-optimization", 1968 .data = &sysctl_kprobes_optimization, 1969 .maxlen = sizeof(int), 1970 .mode = 0644, 1971 .proc_handler = proc_kprobes_optimization_handler, 1972 .extra1 = SYSCTL_ZERO, 1973 .extra2 = SYSCTL_ONE, 1974 }, 1975 #endif 1976 { } 1977 }; 1978 1979 static struct ctl_table dev_table[] = { 1980 { } 1981 }; 1982 1983 int __init sysctl_init(void) 1984 { 1985 struct ctl_table_header *hdr; 1986 1987 hdr = register_sysctl_table(sysctl_base_table); 1988 kmemleak_not_leak(hdr); 1989 return 0; 1990 } 1991 1992 #endif /* CONFIG_SYSCTL */ 1993 1994 /* 1995 * /proc/sys support 1996 */ 1997 1998 #ifdef CONFIG_PROC_SYSCTL 1999 2000 static int _proc_do_string(char *data, int maxlen, int write, 2001 char __user *buffer, 2002 size_t *lenp, loff_t *ppos) 2003 { 2004 size_t len; 2005 char __user *p; 2006 char c; 2007 2008 if (!data || !maxlen || !*lenp) { 2009 *lenp = 0; 2010 return 0; 2011 } 2012 2013 if (write) { 2014 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 2015 /* Only continue writes not past the end of buffer. */ 2016 len = strlen(data); 2017 if (len > maxlen - 1) 2018 len = maxlen - 1; 2019 2020 if (*ppos > len) 2021 return 0; 2022 len = *ppos; 2023 } else { 2024 /* Start writing from beginning of buffer. */ 2025 len = 0; 2026 } 2027 2028 *ppos += *lenp; 2029 p = buffer; 2030 while ((p - buffer) < *lenp && len < maxlen - 1) { 2031 if (get_user(c, p++)) 2032 return -EFAULT; 2033 if (c == 0 || c == '\n') 2034 break; 2035 data[len++] = c; 2036 } 2037 data[len] = 0; 2038 } else { 2039 len = strlen(data); 2040 if (len > maxlen) 2041 len = maxlen; 2042 2043 if (*ppos > len) { 2044 *lenp = 0; 2045 return 0; 2046 } 2047 2048 data += *ppos; 2049 len -= *ppos; 2050 2051 if (len > *lenp) 2052 len = *lenp; 2053 if (len) 2054 if (copy_to_user(buffer, data, len)) 2055 return -EFAULT; 2056 if (len < *lenp) { 2057 if (put_user('\n', buffer + len)) 2058 return -EFAULT; 2059 len++; 2060 } 2061 *lenp = len; 2062 *ppos += len; 2063 } 2064 return 0; 2065 } 2066 2067 static void warn_sysctl_write(struct ctl_table *table) 2068 { 2069 pr_warn_once("%s wrote to %s when file position was not 0!\n" 2070 "This will not be supported in the future. To silence this\n" 2071 "warning, set kernel.sysctl_writes_strict = -1\n", 2072 current->comm, table->procname); 2073 } 2074 2075 /** 2076 * proc_first_pos_non_zero_ignore - check if first position is allowed 2077 * @ppos: file position 2078 * @table: the sysctl table 2079 * 2080 * Returns true if the first position is non-zero and the sysctl_writes_strict 2081 * mode indicates this is not allowed for numeric input types. String proc 2082 * handlers can ignore the return value. 2083 */ 2084 static bool proc_first_pos_non_zero_ignore(loff_t *ppos, 2085 struct ctl_table *table) 2086 { 2087 if (!*ppos) 2088 return false; 2089 2090 switch (sysctl_writes_strict) { 2091 case SYSCTL_WRITES_STRICT: 2092 return true; 2093 case SYSCTL_WRITES_WARN: 2094 warn_sysctl_write(table); 2095 return false; 2096 default: 2097 return false; 2098 } 2099 } 2100 2101 /** 2102 * proc_dostring - read a string sysctl 2103 * @table: the sysctl table 2104 * @write: %TRUE if this is a write to the sysctl file 2105 * @buffer: the user buffer 2106 * @lenp: the size of the user buffer 2107 * @ppos: file position 2108 * 2109 * Reads/writes a string from/to the user buffer. If the kernel 2110 * buffer provided is not large enough to hold the string, the 2111 * string is truncated. The copied string is %NULL-terminated. 2112 * If the string is being read by the user process, it is copied 2113 * and a newline '\n' is added. It is truncated if the buffer is 2114 * not large enough. 2115 * 2116 * Returns 0 on success. 2117 */ 2118 int proc_dostring(struct ctl_table *table, int write, 2119 void __user *buffer, size_t *lenp, loff_t *ppos) 2120 { 2121 if (write) 2122 proc_first_pos_non_zero_ignore(ppos, table); 2123 2124 return _proc_do_string((char *)(table->data), table->maxlen, write, 2125 (char __user *)buffer, lenp, ppos); 2126 } 2127 2128 static size_t proc_skip_spaces(char **buf) 2129 { 2130 size_t ret; 2131 char *tmp = skip_spaces(*buf); 2132 ret = tmp - *buf; 2133 *buf = tmp; 2134 return ret; 2135 } 2136 2137 static void proc_skip_char(char **buf, size_t *size, const char v) 2138 { 2139 while (*size) { 2140 if (**buf != v) 2141 break; 2142 (*size)--; 2143 (*buf)++; 2144 } 2145 } 2146 2147 /** 2148 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only 2149 * fail on overflow 2150 * 2151 * @cp: kernel buffer containing the string to parse 2152 * @endp: pointer to store the trailing characters 2153 * @base: the base to use 2154 * @res: where the parsed integer will be stored 2155 * 2156 * In case of success 0 is returned and @res will contain the parsed integer, 2157 * @endp will hold any trailing characters. 2158 * This function will fail the parse on overflow. If there wasn't an overflow 2159 * the function will defer the decision what characters count as invalid to the 2160 * caller. 2161 */ 2162 static int strtoul_lenient(const char *cp, char **endp, unsigned int base, 2163 unsigned long *res) 2164 { 2165 unsigned long long result; 2166 unsigned int rv; 2167 2168 cp = _parse_integer_fixup_radix(cp, &base); 2169 rv = _parse_integer(cp, base, &result); 2170 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result)) 2171 return -ERANGE; 2172 2173 cp += rv; 2174 2175 if (endp) 2176 *endp = (char *)cp; 2177 2178 *res = (unsigned long)result; 2179 return 0; 2180 } 2181 2182 #define TMPBUFLEN 22 2183 /** 2184 * proc_get_long - reads an ASCII formatted integer from a user buffer 2185 * 2186 * @buf: a kernel buffer 2187 * @size: size of the kernel buffer 2188 * @val: this is where the number will be stored 2189 * @neg: set to %TRUE if number is negative 2190 * @perm_tr: a vector which contains the allowed trailers 2191 * @perm_tr_len: size of the perm_tr vector 2192 * @tr: pointer to store the trailer character 2193 * 2194 * In case of success %0 is returned and @buf and @size are updated with 2195 * the amount of bytes read. If @tr is non-NULL and a trailing 2196 * character exists (size is non-zero after returning from this 2197 * function), @tr is updated with the trailing character. 2198 */ 2199 static int proc_get_long(char **buf, size_t *size, 2200 unsigned long *val, bool *neg, 2201 const char *perm_tr, unsigned perm_tr_len, char *tr) 2202 { 2203 int len; 2204 char *p, tmp[TMPBUFLEN]; 2205 2206 if (!*size) 2207 return -EINVAL; 2208 2209 len = *size; 2210 if (len > TMPBUFLEN - 1) 2211 len = TMPBUFLEN - 1; 2212 2213 memcpy(tmp, *buf, len); 2214 2215 tmp[len] = 0; 2216 p = tmp; 2217 if (*p == '-' && *size > 1) { 2218 *neg = true; 2219 p++; 2220 } else 2221 *neg = false; 2222 if (!isdigit(*p)) 2223 return -EINVAL; 2224 2225 if (strtoul_lenient(p, &p, 0, val)) 2226 return -EINVAL; 2227 2228 len = p - tmp; 2229 2230 /* We don't know if the next char is whitespace thus we may accept 2231 * invalid integers (e.g. 1234...a) or two integers instead of one 2232 * (e.g. 123...1). So lets not allow such large numbers. */ 2233 if (len == TMPBUFLEN - 1) 2234 return -EINVAL; 2235 2236 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2237 return -EINVAL; 2238 2239 if (tr && (len < *size)) 2240 *tr = *p; 2241 2242 *buf += len; 2243 *size -= len; 2244 2245 return 0; 2246 } 2247 2248 /** 2249 * proc_put_long - converts an integer to a decimal ASCII formatted string 2250 * 2251 * @buf: the user buffer 2252 * @size: the size of the user buffer 2253 * @val: the integer to be converted 2254 * @neg: sign of the number, %TRUE for negative 2255 * 2256 * In case of success %0 is returned and @buf and @size are updated with 2257 * the amount of bytes written. 2258 */ 2259 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2260 bool neg) 2261 { 2262 int len; 2263 char tmp[TMPBUFLEN], *p = tmp; 2264 2265 sprintf(p, "%s%lu", neg ? "-" : "", val); 2266 len = strlen(tmp); 2267 if (len > *size) 2268 len = *size; 2269 if (copy_to_user(*buf, tmp, len)) 2270 return -EFAULT; 2271 *size -= len; 2272 *buf += len; 2273 return 0; 2274 } 2275 #undef TMPBUFLEN 2276 2277 static int proc_put_char(void __user **buf, size_t *size, char c) 2278 { 2279 if (*size) { 2280 char __user **buffer = (char __user **)buf; 2281 if (put_user(c, *buffer)) 2282 return -EFAULT; 2283 (*size)--, (*buffer)++; 2284 *buf = *buffer; 2285 } 2286 return 0; 2287 } 2288 2289 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2290 int *valp, 2291 int write, void *data) 2292 { 2293 if (write) { 2294 if (*negp) { 2295 if (*lvalp > (unsigned long) INT_MAX + 1) 2296 return -EINVAL; 2297 *valp = -*lvalp; 2298 } else { 2299 if (*lvalp > (unsigned long) INT_MAX) 2300 return -EINVAL; 2301 *valp = *lvalp; 2302 } 2303 } else { 2304 int val = *valp; 2305 if (val < 0) { 2306 *negp = true; 2307 *lvalp = -(unsigned long)val; 2308 } else { 2309 *negp = false; 2310 *lvalp = (unsigned long)val; 2311 } 2312 } 2313 return 0; 2314 } 2315 2316 static int do_proc_douintvec_conv(unsigned long *lvalp, 2317 unsigned int *valp, 2318 int write, void *data) 2319 { 2320 if (write) { 2321 if (*lvalp > UINT_MAX) 2322 return -EINVAL; 2323 *valp = *lvalp; 2324 } else { 2325 unsigned int val = *valp; 2326 *lvalp = (unsigned long)val; 2327 } 2328 return 0; 2329 } 2330 2331 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2332 2333 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2334 int write, void __user *buffer, 2335 size_t *lenp, loff_t *ppos, 2336 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2337 int write, void *data), 2338 void *data) 2339 { 2340 int *i, vleft, first = 1, err = 0; 2341 size_t left; 2342 char *kbuf = NULL, *p; 2343 2344 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2345 *lenp = 0; 2346 return 0; 2347 } 2348 2349 i = (int *) tbl_data; 2350 vleft = table->maxlen / sizeof(*i); 2351 left = *lenp; 2352 2353 if (!conv) 2354 conv = do_proc_dointvec_conv; 2355 2356 if (write) { 2357 if (proc_first_pos_non_zero_ignore(ppos, table)) 2358 goto out; 2359 2360 if (left > PAGE_SIZE - 1) 2361 left = PAGE_SIZE - 1; 2362 p = kbuf = memdup_user_nul(buffer, left); 2363 if (IS_ERR(kbuf)) 2364 return PTR_ERR(kbuf); 2365 } 2366 2367 for (; left && vleft--; i++, first=0) { 2368 unsigned long lval; 2369 bool neg; 2370 2371 if (write) { 2372 left -= proc_skip_spaces(&p); 2373 2374 if (!left) 2375 break; 2376 err = proc_get_long(&p, &left, &lval, &neg, 2377 proc_wspace_sep, 2378 sizeof(proc_wspace_sep), NULL); 2379 if (err) 2380 break; 2381 if (conv(&neg, &lval, i, 1, data)) { 2382 err = -EINVAL; 2383 break; 2384 } 2385 } else { 2386 if (conv(&neg, &lval, i, 0, data)) { 2387 err = -EINVAL; 2388 break; 2389 } 2390 if (!first) 2391 err = proc_put_char(&buffer, &left, '\t'); 2392 if (err) 2393 break; 2394 err = proc_put_long(&buffer, &left, lval, neg); 2395 if (err) 2396 break; 2397 } 2398 } 2399 2400 if (!write && !first && left && !err) 2401 err = proc_put_char(&buffer, &left, '\n'); 2402 if (write && !err && left) 2403 left -= proc_skip_spaces(&p); 2404 if (write) { 2405 kfree(kbuf); 2406 if (first) 2407 return err ? : -EINVAL; 2408 } 2409 *lenp -= left; 2410 out: 2411 *ppos += *lenp; 2412 return err; 2413 } 2414 2415 static int do_proc_dointvec(struct ctl_table *table, int write, 2416 void __user *buffer, size_t *lenp, loff_t *ppos, 2417 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2418 int write, void *data), 2419 void *data) 2420 { 2421 return __do_proc_dointvec(table->data, table, write, 2422 buffer, lenp, ppos, conv, data); 2423 } 2424 2425 static int do_proc_douintvec_w(unsigned int *tbl_data, 2426 struct ctl_table *table, 2427 void __user *buffer, 2428 size_t *lenp, loff_t *ppos, 2429 int (*conv)(unsigned long *lvalp, 2430 unsigned int *valp, 2431 int write, void *data), 2432 void *data) 2433 { 2434 unsigned long lval; 2435 int err = 0; 2436 size_t left; 2437 bool neg; 2438 char *kbuf = NULL, *p; 2439 2440 left = *lenp; 2441 2442 if (proc_first_pos_non_zero_ignore(ppos, table)) 2443 goto bail_early; 2444 2445 if (left > PAGE_SIZE - 1) 2446 left = PAGE_SIZE - 1; 2447 2448 p = kbuf = memdup_user_nul(buffer, left); 2449 if (IS_ERR(kbuf)) 2450 return -EINVAL; 2451 2452 left -= proc_skip_spaces(&p); 2453 if (!left) { 2454 err = -EINVAL; 2455 goto out_free; 2456 } 2457 2458 err = proc_get_long(&p, &left, &lval, &neg, 2459 proc_wspace_sep, 2460 sizeof(proc_wspace_sep), NULL); 2461 if (err || neg) { 2462 err = -EINVAL; 2463 goto out_free; 2464 } 2465 2466 if (conv(&lval, tbl_data, 1, data)) { 2467 err = -EINVAL; 2468 goto out_free; 2469 } 2470 2471 if (!err && left) 2472 left -= proc_skip_spaces(&p); 2473 2474 out_free: 2475 kfree(kbuf); 2476 if (err) 2477 return -EINVAL; 2478 2479 return 0; 2480 2481 /* This is in keeping with old __do_proc_dointvec() */ 2482 bail_early: 2483 *ppos += *lenp; 2484 return err; 2485 } 2486 2487 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, 2488 size_t *lenp, loff_t *ppos, 2489 int (*conv)(unsigned long *lvalp, 2490 unsigned int *valp, 2491 int write, void *data), 2492 void *data) 2493 { 2494 unsigned long lval; 2495 int err = 0; 2496 size_t left; 2497 2498 left = *lenp; 2499 2500 if (conv(&lval, tbl_data, 0, data)) { 2501 err = -EINVAL; 2502 goto out; 2503 } 2504 2505 err = proc_put_long(&buffer, &left, lval, false); 2506 if (err || !left) 2507 goto out; 2508 2509 err = proc_put_char(&buffer, &left, '\n'); 2510 2511 out: 2512 *lenp -= left; 2513 *ppos += *lenp; 2514 2515 return err; 2516 } 2517 2518 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, 2519 int write, void __user *buffer, 2520 size_t *lenp, loff_t *ppos, 2521 int (*conv)(unsigned long *lvalp, 2522 unsigned int *valp, 2523 int write, void *data), 2524 void *data) 2525 { 2526 unsigned int *i, vleft; 2527 2528 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2529 *lenp = 0; 2530 return 0; 2531 } 2532 2533 i = (unsigned int *) tbl_data; 2534 vleft = table->maxlen / sizeof(*i); 2535 2536 /* 2537 * Arrays are not supported, keep this simple. *Do not* add 2538 * support for them. 2539 */ 2540 if (vleft != 1) { 2541 *lenp = 0; 2542 return -EINVAL; 2543 } 2544 2545 if (!conv) 2546 conv = do_proc_douintvec_conv; 2547 2548 if (write) 2549 return do_proc_douintvec_w(i, table, buffer, lenp, ppos, 2550 conv, data); 2551 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); 2552 } 2553 2554 static int do_proc_douintvec(struct ctl_table *table, int write, 2555 void __user *buffer, size_t *lenp, loff_t *ppos, 2556 int (*conv)(unsigned long *lvalp, 2557 unsigned int *valp, 2558 int write, void *data), 2559 void *data) 2560 { 2561 return __do_proc_douintvec(table->data, table, write, 2562 buffer, lenp, ppos, conv, data); 2563 } 2564 2565 /** 2566 * proc_dointvec - read a vector of integers 2567 * @table: the sysctl table 2568 * @write: %TRUE if this is a write to the sysctl file 2569 * @buffer: the user buffer 2570 * @lenp: the size of the user buffer 2571 * @ppos: file position 2572 * 2573 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2574 * values from/to the user buffer, treated as an ASCII string. 2575 * 2576 * Returns 0 on success. 2577 */ 2578 int proc_dointvec(struct ctl_table *table, int write, 2579 void __user *buffer, size_t *lenp, loff_t *ppos) 2580 { 2581 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2582 } 2583 2584 /** 2585 * proc_douintvec - read a vector of unsigned integers 2586 * @table: the sysctl table 2587 * @write: %TRUE if this is a write to the sysctl file 2588 * @buffer: the user buffer 2589 * @lenp: the size of the user buffer 2590 * @ppos: file position 2591 * 2592 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2593 * values from/to the user buffer, treated as an ASCII string. 2594 * 2595 * Returns 0 on success. 2596 */ 2597 int proc_douintvec(struct ctl_table *table, int write, 2598 void __user *buffer, size_t *lenp, loff_t *ppos) 2599 { 2600 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2601 do_proc_douintvec_conv, NULL); 2602 } 2603 2604 /* 2605 * Taint values can only be increased 2606 * This means we can safely use a temporary. 2607 */ 2608 static int proc_taint(struct ctl_table *table, int write, 2609 void __user *buffer, size_t *lenp, loff_t *ppos) 2610 { 2611 struct ctl_table t; 2612 unsigned long tmptaint = get_taint(); 2613 int err; 2614 2615 if (write && !capable(CAP_SYS_ADMIN)) 2616 return -EPERM; 2617 2618 t = *table; 2619 t.data = &tmptaint; 2620 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2621 if (err < 0) 2622 return err; 2623 2624 if (write) { 2625 /* 2626 * Poor man's atomic or. Not worth adding a primitive 2627 * to everyone's atomic.h for this 2628 */ 2629 int i; 2630 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2631 if ((tmptaint >> i) & 1) 2632 add_taint(i, LOCKDEP_STILL_OK); 2633 } 2634 } 2635 2636 return err; 2637 } 2638 2639 #ifdef CONFIG_PRINTK 2640 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2641 void __user *buffer, size_t *lenp, loff_t *ppos) 2642 { 2643 if (write && !capable(CAP_SYS_ADMIN)) 2644 return -EPERM; 2645 2646 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2647 } 2648 #endif 2649 2650 /** 2651 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure 2652 * @min: pointer to minimum allowable value 2653 * @max: pointer to maximum allowable value 2654 * 2655 * The do_proc_dointvec_minmax_conv_param structure provides the 2656 * minimum and maximum values for doing range checking for those sysctl 2657 * parameters that use the proc_dointvec_minmax() handler. 2658 */ 2659 struct do_proc_dointvec_minmax_conv_param { 2660 int *min; 2661 int *max; 2662 }; 2663 2664 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2665 int *valp, 2666 int write, void *data) 2667 { 2668 int tmp, ret; 2669 struct do_proc_dointvec_minmax_conv_param *param = data; 2670 /* 2671 * If writing, first do so via a temporary local int so we can 2672 * bounds-check it before touching *valp. 2673 */ 2674 int *ip = write ? &tmp : valp; 2675 2676 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data); 2677 if (ret) 2678 return ret; 2679 2680 if (write) { 2681 if ((param->min && *param->min > tmp) || 2682 (param->max && *param->max < tmp)) 2683 return -EINVAL; 2684 *valp = tmp; 2685 } 2686 2687 return 0; 2688 } 2689 2690 /** 2691 * proc_dointvec_minmax - read a vector of integers with min/max values 2692 * @table: the sysctl table 2693 * @write: %TRUE if this is a write to the sysctl file 2694 * @buffer: the user buffer 2695 * @lenp: the size of the user buffer 2696 * @ppos: file position 2697 * 2698 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2699 * values from/to the user buffer, treated as an ASCII string. 2700 * 2701 * This routine will ensure the values are within the range specified by 2702 * table->extra1 (min) and table->extra2 (max). 2703 * 2704 * Returns 0 on success or -EINVAL on write when the range check fails. 2705 */ 2706 int proc_dointvec_minmax(struct ctl_table *table, int write, 2707 void __user *buffer, size_t *lenp, loff_t *ppos) 2708 { 2709 struct do_proc_dointvec_minmax_conv_param param = { 2710 .min = (int *) table->extra1, 2711 .max = (int *) table->extra2, 2712 }; 2713 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2714 do_proc_dointvec_minmax_conv, ¶m); 2715 } 2716 2717 /** 2718 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure 2719 * @min: pointer to minimum allowable value 2720 * @max: pointer to maximum allowable value 2721 * 2722 * The do_proc_douintvec_minmax_conv_param structure provides the 2723 * minimum and maximum values for doing range checking for those sysctl 2724 * parameters that use the proc_douintvec_minmax() handler. 2725 */ 2726 struct do_proc_douintvec_minmax_conv_param { 2727 unsigned int *min; 2728 unsigned int *max; 2729 }; 2730 2731 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, 2732 unsigned int *valp, 2733 int write, void *data) 2734 { 2735 int ret; 2736 unsigned int tmp; 2737 struct do_proc_douintvec_minmax_conv_param *param = data; 2738 /* write via temporary local uint for bounds-checking */ 2739 unsigned int *up = write ? &tmp : valp; 2740 2741 ret = do_proc_douintvec_conv(lvalp, up, write, data); 2742 if (ret) 2743 return ret; 2744 2745 if (write) { 2746 if ((param->min && *param->min > tmp) || 2747 (param->max && *param->max < tmp)) 2748 return -ERANGE; 2749 2750 *valp = tmp; 2751 } 2752 2753 return 0; 2754 } 2755 2756 /** 2757 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values 2758 * @table: the sysctl table 2759 * @write: %TRUE if this is a write to the sysctl file 2760 * @buffer: the user buffer 2761 * @lenp: the size of the user buffer 2762 * @ppos: file position 2763 * 2764 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2765 * values from/to the user buffer, treated as an ASCII string. Negative 2766 * strings are not allowed. 2767 * 2768 * This routine will ensure the values are within the range specified by 2769 * table->extra1 (min) and table->extra2 (max). There is a final sanity 2770 * check for UINT_MAX to avoid having to support wrap around uses from 2771 * userspace. 2772 * 2773 * Returns 0 on success or -ERANGE on write when the range check fails. 2774 */ 2775 int proc_douintvec_minmax(struct ctl_table *table, int write, 2776 void __user *buffer, size_t *lenp, loff_t *ppos) 2777 { 2778 struct do_proc_douintvec_minmax_conv_param param = { 2779 .min = (unsigned int *) table->extra1, 2780 .max = (unsigned int *) table->extra2, 2781 }; 2782 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2783 do_proc_douintvec_minmax_conv, ¶m); 2784 } 2785 2786 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp, 2787 unsigned int *valp, 2788 int write, void *data) 2789 { 2790 if (write) { 2791 unsigned int val; 2792 2793 val = round_pipe_size(*lvalp); 2794 if (val == 0) 2795 return -EINVAL; 2796 2797 *valp = val; 2798 } else { 2799 unsigned int val = *valp; 2800 *lvalp = (unsigned long) val; 2801 } 2802 2803 return 0; 2804 } 2805 2806 static int proc_dopipe_max_size(struct ctl_table *table, int write, 2807 void __user *buffer, size_t *lenp, loff_t *ppos) 2808 { 2809 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2810 do_proc_dopipe_max_size_conv, NULL); 2811 } 2812 2813 static void validate_coredump_safety(void) 2814 { 2815 #ifdef CONFIG_COREDUMP 2816 if (suid_dumpable == SUID_DUMP_ROOT && 2817 core_pattern[0] != '/' && core_pattern[0] != '|') { 2818 printk(KERN_WARNING 2819 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 2820 "Pipe handler or fully qualified core dump path required.\n" 2821 "Set kernel.core_pattern before fs.suid_dumpable.\n" 2822 ); 2823 } 2824 #endif 2825 } 2826 2827 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2828 void __user *buffer, size_t *lenp, loff_t *ppos) 2829 { 2830 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2831 if (!error) 2832 validate_coredump_safety(); 2833 return error; 2834 } 2835 2836 #ifdef CONFIG_COREDUMP 2837 static int proc_dostring_coredump(struct ctl_table *table, int write, 2838 void __user *buffer, size_t *lenp, loff_t *ppos) 2839 { 2840 int error = proc_dostring(table, write, buffer, lenp, ppos); 2841 if (!error) 2842 validate_coredump_safety(); 2843 return error; 2844 } 2845 #endif 2846 2847 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2848 void __user *buffer, 2849 size_t *lenp, loff_t *ppos, 2850 unsigned long convmul, 2851 unsigned long convdiv) 2852 { 2853 unsigned long *i, *min, *max; 2854 int vleft, first = 1, err = 0; 2855 size_t left; 2856 char *kbuf = NULL, *p; 2857 2858 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2859 *lenp = 0; 2860 return 0; 2861 } 2862 2863 i = (unsigned long *) data; 2864 min = (unsigned long *) table->extra1; 2865 max = (unsigned long *) table->extra2; 2866 vleft = table->maxlen / sizeof(unsigned long); 2867 left = *lenp; 2868 2869 if (write) { 2870 if (proc_first_pos_non_zero_ignore(ppos, table)) 2871 goto out; 2872 2873 if (left > PAGE_SIZE - 1) 2874 left = PAGE_SIZE - 1; 2875 p = kbuf = memdup_user_nul(buffer, left); 2876 if (IS_ERR(kbuf)) 2877 return PTR_ERR(kbuf); 2878 } 2879 2880 for (; left && vleft--; i++, first = 0) { 2881 unsigned long val; 2882 2883 if (write) { 2884 bool neg; 2885 2886 left -= proc_skip_spaces(&p); 2887 if (!left) 2888 break; 2889 2890 err = proc_get_long(&p, &left, &val, &neg, 2891 proc_wspace_sep, 2892 sizeof(proc_wspace_sep), NULL); 2893 if (err) 2894 break; 2895 if (neg) 2896 continue; 2897 val = convmul * val / convdiv; 2898 if ((min && val < *min) || (max && val > *max)) { 2899 err = -EINVAL; 2900 break; 2901 } 2902 *i = val; 2903 } else { 2904 val = convdiv * (*i) / convmul; 2905 if (!first) { 2906 err = proc_put_char(&buffer, &left, '\t'); 2907 if (err) 2908 break; 2909 } 2910 err = proc_put_long(&buffer, &left, val, false); 2911 if (err) 2912 break; 2913 } 2914 } 2915 2916 if (!write && !first && left && !err) 2917 err = proc_put_char(&buffer, &left, '\n'); 2918 if (write && !err) 2919 left -= proc_skip_spaces(&p); 2920 if (write) { 2921 kfree(kbuf); 2922 if (first) 2923 return err ? : -EINVAL; 2924 } 2925 *lenp -= left; 2926 out: 2927 *ppos += *lenp; 2928 return err; 2929 } 2930 2931 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2932 void __user *buffer, 2933 size_t *lenp, loff_t *ppos, 2934 unsigned long convmul, 2935 unsigned long convdiv) 2936 { 2937 return __do_proc_doulongvec_minmax(table->data, table, write, 2938 buffer, lenp, ppos, convmul, convdiv); 2939 } 2940 2941 /** 2942 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2943 * @table: the sysctl table 2944 * @write: %TRUE if this is a write to the sysctl file 2945 * @buffer: the user buffer 2946 * @lenp: the size of the user buffer 2947 * @ppos: file position 2948 * 2949 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2950 * values from/to the user buffer, treated as an ASCII string. 2951 * 2952 * This routine will ensure the values are within the range specified by 2953 * table->extra1 (min) and table->extra2 (max). 2954 * 2955 * Returns 0 on success. 2956 */ 2957 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2958 void __user *buffer, size_t *lenp, loff_t *ppos) 2959 { 2960 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2961 } 2962 2963 /** 2964 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2965 * @table: the sysctl table 2966 * @write: %TRUE if this is a write to the sysctl file 2967 * @buffer: the user buffer 2968 * @lenp: the size of the user buffer 2969 * @ppos: file position 2970 * 2971 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2972 * values from/to the user buffer, treated as an ASCII string. The values 2973 * are treated as milliseconds, and converted to jiffies when they are stored. 2974 * 2975 * This routine will ensure the values are within the range specified by 2976 * table->extra1 (min) and table->extra2 (max). 2977 * 2978 * Returns 0 on success. 2979 */ 2980 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2981 void __user *buffer, 2982 size_t *lenp, loff_t *ppos) 2983 { 2984 return do_proc_doulongvec_minmax(table, write, buffer, 2985 lenp, ppos, HZ, 1000l); 2986 } 2987 2988 2989 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2990 int *valp, 2991 int write, void *data) 2992 { 2993 if (write) { 2994 if (*lvalp > INT_MAX / HZ) 2995 return 1; 2996 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2997 } else { 2998 int val = *valp; 2999 unsigned long lval; 3000 if (val < 0) { 3001 *negp = true; 3002 lval = -(unsigned long)val; 3003 } else { 3004 *negp = false; 3005 lval = (unsigned long)val; 3006 } 3007 *lvalp = lval / HZ; 3008 } 3009 return 0; 3010 } 3011 3012 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 3013 int *valp, 3014 int write, void *data) 3015 { 3016 if (write) { 3017 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 3018 return 1; 3019 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 3020 } else { 3021 int val = *valp; 3022 unsigned long lval; 3023 if (val < 0) { 3024 *negp = true; 3025 lval = -(unsigned long)val; 3026 } else { 3027 *negp = false; 3028 lval = (unsigned long)val; 3029 } 3030 *lvalp = jiffies_to_clock_t(lval); 3031 } 3032 return 0; 3033 } 3034 3035 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 3036 int *valp, 3037 int write, void *data) 3038 { 3039 if (write) { 3040 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 3041 3042 if (jif > INT_MAX) 3043 return 1; 3044 *valp = (int)jif; 3045 } else { 3046 int val = *valp; 3047 unsigned long lval; 3048 if (val < 0) { 3049 *negp = true; 3050 lval = -(unsigned long)val; 3051 } else { 3052 *negp = false; 3053 lval = (unsigned long)val; 3054 } 3055 *lvalp = jiffies_to_msecs(lval); 3056 } 3057 return 0; 3058 } 3059 3060 /** 3061 * proc_dointvec_jiffies - read a vector of integers as seconds 3062 * @table: the sysctl table 3063 * @write: %TRUE if this is a write to the sysctl file 3064 * @buffer: the user buffer 3065 * @lenp: the size of the user buffer 3066 * @ppos: file position 3067 * 3068 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 3069 * values from/to the user buffer, treated as an ASCII string. 3070 * The values read are assumed to be in seconds, and are converted into 3071 * jiffies. 3072 * 3073 * Returns 0 on success. 3074 */ 3075 int proc_dointvec_jiffies(struct ctl_table *table, int write, 3076 void __user *buffer, size_t *lenp, loff_t *ppos) 3077 { 3078 return do_proc_dointvec(table,write,buffer,lenp,ppos, 3079 do_proc_dointvec_jiffies_conv,NULL); 3080 } 3081 3082 /** 3083 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 3084 * @table: the sysctl table 3085 * @write: %TRUE if this is a write to the sysctl file 3086 * @buffer: the user buffer 3087 * @lenp: the size of the user buffer 3088 * @ppos: pointer to the file position 3089 * 3090 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 3091 * values from/to the user buffer, treated as an ASCII string. 3092 * The values read are assumed to be in 1/USER_HZ seconds, and 3093 * are converted into jiffies. 3094 * 3095 * Returns 0 on success. 3096 */ 3097 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 3098 void __user *buffer, size_t *lenp, loff_t *ppos) 3099 { 3100 return do_proc_dointvec(table,write,buffer,lenp,ppos, 3101 do_proc_dointvec_userhz_jiffies_conv,NULL); 3102 } 3103 3104 /** 3105 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 3106 * @table: the sysctl table 3107 * @write: %TRUE if this is a write to the sysctl file 3108 * @buffer: the user buffer 3109 * @lenp: the size of the user buffer 3110 * @ppos: file position 3111 * @ppos: the current position in the file 3112 * 3113 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 3114 * values from/to the user buffer, treated as an ASCII string. 3115 * The values read are assumed to be in 1/1000 seconds, and 3116 * are converted into jiffies. 3117 * 3118 * Returns 0 on success. 3119 */ 3120 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 3121 void __user *buffer, size_t *lenp, loff_t *ppos) 3122 { 3123 return do_proc_dointvec(table, write, buffer, lenp, ppos, 3124 do_proc_dointvec_ms_jiffies_conv, NULL); 3125 } 3126 3127 static int proc_do_cad_pid(struct ctl_table *table, int write, 3128 void __user *buffer, size_t *lenp, loff_t *ppos) 3129 { 3130 struct pid *new_pid; 3131 pid_t tmp; 3132 int r; 3133 3134 tmp = pid_vnr(cad_pid); 3135 3136 r = __do_proc_dointvec(&tmp, table, write, buffer, 3137 lenp, ppos, NULL, NULL); 3138 if (r || !write) 3139 return r; 3140 3141 new_pid = find_get_pid(tmp); 3142 if (!new_pid) 3143 return -ESRCH; 3144 3145 put_pid(xchg(&cad_pid, new_pid)); 3146 return 0; 3147 } 3148 3149 /** 3150 * proc_do_large_bitmap - read/write from/to a large bitmap 3151 * @table: the sysctl table 3152 * @write: %TRUE if this is a write to the sysctl file 3153 * @buffer: the user buffer 3154 * @lenp: the size of the user buffer 3155 * @ppos: file position 3156 * 3157 * The bitmap is stored at table->data and the bitmap length (in bits) 3158 * in table->maxlen. 3159 * 3160 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 3161 * large bitmaps may be represented in a compact manner. Writing into 3162 * the file will clear the bitmap then update it with the given input. 3163 * 3164 * Returns 0 on success. 3165 */ 3166 int proc_do_large_bitmap(struct ctl_table *table, int write, 3167 void __user *buffer, size_t *lenp, loff_t *ppos) 3168 { 3169 int err = 0; 3170 bool first = 1; 3171 size_t left = *lenp; 3172 unsigned long bitmap_len = table->maxlen; 3173 unsigned long *bitmap = *(unsigned long **) table->data; 3174 unsigned long *tmp_bitmap = NULL; 3175 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 3176 3177 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 3178 *lenp = 0; 3179 return 0; 3180 } 3181 3182 if (write) { 3183 char *kbuf, *p; 3184 size_t skipped = 0; 3185 3186 if (left > PAGE_SIZE - 1) { 3187 left = PAGE_SIZE - 1; 3188 /* How much of the buffer we'll skip this pass */ 3189 skipped = *lenp - left; 3190 } 3191 3192 p = kbuf = memdup_user_nul(buffer, left); 3193 if (IS_ERR(kbuf)) 3194 return PTR_ERR(kbuf); 3195 3196 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL); 3197 if (!tmp_bitmap) { 3198 kfree(kbuf); 3199 return -ENOMEM; 3200 } 3201 proc_skip_char(&p, &left, '\n'); 3202 while (!err && left) { 3203 unsigned long val_a, val_b; 3204 bool neg; 3205 size_t saved_left; 3206 3207 /* In case we stop parsing mid-number, we can reset */ 3208 saved_left = left; 3209 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 3210 sizeof(tr_a), &c); 3211 /* 3212 * If we consumed the entirety of a truncated buffer or 3213 * only one char is left (may be a "-"), then stop here, 3214 * reset, & come back for more. 3215 */ 3216 if ((left <= 1) && skipped) { 3217 left = saved_left; 3218 break; 3219 } 3220 3221 if (err) 3222 break; 3223 if (val_a >= bitmap_len || neg) { 3224 err = -EINVAL; 3225 break; 3226 } 3227 3228 val_b = val_a; 3229 if (left) { 3230 p++; 3231 left--; 3232 } 3233 3234 if (c == '-') { 3235 err = proc_get_long(&p, &left, &val_b, 3236 &neg, tr_b, sizeof(tr_b), 3237 &c); 3238 /* 3239 * If we consumed all of a truncated buffer or 3240 * then stop here, reset, & come back for more. 3241 */ 3242 if (!left && skipped) { 3243 left = saved_left; 3244 break; 3245 } 3246 3247 if (err) 3248 break; 3249 if (val_b >= bitmap_len || neg || 3250 val_a > val_b) { 3251 err = -EINVAL; 3252 break; 3253 } 3254 if (left) { 3255 p++; 3256 left--; 3257 } 3258 } 3259 3260 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 3261 first = 0; 3262 proc_skip_char(&p, &left, '\n'); 3263 } 3264 kfree(kbuf); 3265 left += skipped; 3266 } else { 3267 unsigned long bit_a, bit_b = 0; 3268 3269 while (left) { 3270 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 3271 if (bit_a >= bitmap_len) 3272 break; 3273 bit_b = find_next_zero_bit(bitmap, bitmap_len, 3274 bit_a + 1) - 1; 3275 3276 if (!first) { 3277 err = proc_put_char(&buffer, &left, ','); 3278 if (err) 3279 break; 3280 } 3281 err = proc_put_long(&buffer, &left, bit_a, false); 3282 if (err) 3283 break; 3284 if (bit_a != bit_b) { 3285 err = proc_put_char(&buffer, &left, '-'); 3286 if (err) 3287 break; 3288 err = proc_put_long(&buffer, &left, bit_b, false); 3289 if (err) 3290 break; 3291 } 3292 3293 first = 0; bit_b++; 3294 } 3295 if (!err) 3296 err = proc_put_char(&buffer, &left, '\n'); 3297 } 3298 3299 if (!err) { 3300 if (write) { 3301 if (*ppos) 3302 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 3303 else 3304 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 3305 } 3306 *lenp -= left; 3307 *ppos += *lenp; 3308 } 3309 3310 bitmap_free(tmp_bitmap); 3311 return err; 3312 } 3313 3314 #else /* CONFIG_PROC_SYSCTL */ 3315 3316 int proc_dostring(struct ctl_table *table, int write, 3317 void __user *buffer, size_t *lenp, loff_t *ppos) 3318 { 3319 return -ENOSYS; 3320 } 3321 3322 int proc_dointvec(struct ctl_table *table, int write, 3323 void __user *buffer, size_t *lenp, loff_t *ppos) 3324 { 3325 return -ENOSYS; 3326 } 3327 3328 int proc_douintvec(struct ctl_table *table, int write, 3329 void __user *buffer, size_t *lenp, loff_t *ppos) 3330 { 3331 return -ENOSYS; 3332 } 3333 3334 int proc_dointvec_minmax(struct ctl_table *table, int write, 3335 void __user *buffer, size_t *lenp, loff_t *ppos) 3336 { 3337 return -ENOSYS; 3338 } 3339 3340 int proc_douintvec_minmax(struct ctl_table *table, int write, 3341 void __user *buffer, size_t *lenp, loff_t *ppos) 3342 { 3343 return -ENOSYS; 3344 } 3345 3346 int proc_dointvec_jiffies(struct ctl_table *table, int write, 3347 void __user *buffer, size_t *lenp, loff_t *ppos) 3348 { 3349 return -ENOSYS; 3350 } 3351 3352 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 3353 void __user *buffer, size_t *lenp, loff_t *ppos) 3354 { 3355 return -ENOSYS; 3356 } 3357 3358 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 3359 void __user *buffer, size_t *lenp, loff_t *ppos) 3360 { 3361 return -ENOSYS; 3362 } 3363 3364 int proc_doulongvec_minmax(struct ctl_table *table, int write, 3365 void __user *buffer, size_t *lenp, loff_t *ppos) 3366 { 3367 return -ENOSYS; 3368 } 3369 3370 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 3371 void __user *buffer, 3372 size_t *lenp, loff_t *ppos) 3373 { 3374 return -ENOSYS; 3375 } 3376 3377 int proc_do_large_bitmap(struct ctl_table *table, int write, 3378 void __user *buffer, size_t *lenp, loff_t *ppos) 3379 { 3380 return -ENOSYS; 3381 } 3382 3383 #endif /* CONFIG_PROC_SYSCTL */ 3384 3385 #if defined(CONFIG_SYSCTL) 3386 int proc_do_static_key(struct ctl_table *table, int write, 3387 void __user *buffer, size_t *lenp, 3388 loff_t *ppos) 3389 { 3390 struct static_key *key = (struct static_key *)table->data; 3391 static DEFINE_MUTEX(static_key_mutex); 3392 int val, ret; 3393 struct ctl_table tmp = { 3394 .data = &val, 3395 .maxlen = sizeof(val), 3396 .mode = table->mode, 3397 .extra1 = SYSCTL_ZERO, 3398 .extra2 = SYSCTL_ONE, 3399 }; 3400 3401 if (write && !capable(CAP_SYS_ADMIN)) 3402 return -EPERM; 3403 3404 mutex_lock(&static_key_mutex); 3405 val = static_key_enabled(key); 3406 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 3407 if (write && !ret) { 3408 if (val) 3409 static_key_enable(key); 3410 else 3411 static_key_disable(key); 3412 } 3413 mutex_unlock(&static_key_mutex); 3414 return ret; 3415 } 3416 #endif 3417 /* 3418 * No sense putting this after each symbol definition, twice, 3419 * exception granted :-) 3420 */ 3421 EXPORT_SYMBOL(proc_dointvec); 3422 EXPORT_SYMBOL(proc_douintvec); 3423 EXPORT_SYMBOL(proc_dointvec_jiffies); 3424 EXPORT_SYMBOL(proc_dointvec_minmax); 3425 EXPORT_SYMBOL_GPL(proc_douintvec_minmax); 3426 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3427 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3428 EXPORT_SYMBOL(proc_dostring); 3429 EXPORT_SYMBOL(proc_doulongvec_minmax); 3430 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3431 EXPORT_SYMBOL(proc_do_large_bitmap); 3432