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