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 221 222 #ifdef CONFIG_MAGIC_SYSRQ 223 /* Note: sysrq code uses it's own private copy */ 224 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 225 226 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 227 void __user *buffer, size_t *lenp, 228 loff_t *ppos) 229 { 230 int error; 231 232 error = proc_dointvec(table, write, buffer, lenp, ppos); 233 if (error) 234 return error; 235 236 if (write) 237 sysrq_toggle_support(__sysrq_enabled); 238 239 return 0; 240 } 241 242 #endif 243 244 static struct ctl_table kern_table[]; 245 static struct ctl_table vm_table[]; 246 static struct ctl_table fs_table[]; 247 static struct ctl_table debug_table[]; 248 static struct ctl_table dev_table[]; 249 extern struct ctl_table random_table[]; 250 #ifdef CONFIG_EPOLL 251 extern struct ctl_table epoll_table[]; 252 #endif 253 254 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 255 int sysctl_legacy_va_layout; 256 #endif 257 258 /* The default sysctl tables: */ 259 260 static struct ctl_table sysctl_base_table[] = { 261 { 262 .procname = "kernel", 263 .mode = 0555, 264 .child = kern_table, 265 }, 266 { 267 .procname = "vm", 268 .mode = 0555, 269 .child = vm_table, 270 }, 271 { 272 .procname = "fs", 273 .mode = 0555, 274 .child = fs_table, 275 }, 276 { 277 .procname = "debug", 278 .mode = 0555, 279 .child = debug_table, 280 }, 281 { 282 .procname = "dev", 283 .mode = 0555, 284 .child = dev_table, 285 }, 286 { } 287 }; 288 289 #ifdef CONFIG_SCHED_DEBUG 290 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 291 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 292 static int min_wakeup_granularity_ns; /* 0 usecs */ 293 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 294 #ifdef CONFIG_SMP 295 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 296 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 297 #endif /* CONFIG_SMP */ 298 #endif /* CONFIG_SCHED_DEBUG */ 299 300 #ifdef CONFIG_COMPACTION 301 static int min_extfrag_threshold; 302 static int max_extfrag_threshold = 1000; 303 #endif 304 305 static struct ctl_table kern_table[] = { 306 { 307 .procname = "sched_child_runs_first", 308 .data = &sysctl_sched_child_runs_first, 309 .maxlen = sizeof(unsigned int), 310 .mode = 0644, 311 .proc_handler = proc_dointvec, 312 }, 313 #ifdef CONFIG_SCHED_DEBUG 314 { 315 .procname = "sched_min_granularity_ns", 316 .data = &sysctl_sched_min_granularity, 317 .maxlen = sizeof(unsigned int), 318 .mode = 0644, 319 .proc_handler = sched_proc_update_handler, 320 .extra1 = &min_sched_granularity_ns, 321 .extra2 = &max_sched_granularity_ns, 322 }, 323 { 324 .procname = "sched_latency_ns", 325 .data = &sysctl_sched_latency, 326 .maxlen = sizeof(unsigned int), 327 .mode = 0644, 328 .proc_handler = sched_proc_update_handler, 329 .extra1 = &min_sched_granularity_ns, 330 .extra2 = &max_sched_granularity_ns, 331 }, 332 { 333 .procname = "sched_wakeup_granularity_ns", 334 .data = &sysctl_sched_wakeup_granularity, 335 .maxlen = sizeof(unsigned int), 336 .mode = 0644, 337 .proc_handler = sched_proc_update_handler, 338 .extra1 = &min_wakeup_granularity_ns, 339 .extra2 = &max_wakeup_granularity_ns, 340 }, 341 #ifdef CONFIG_SMP 342 { 343 .procname = "sched_tunable_scaling", 344 .data = &sysctl_sched_tunable_scaling, 345 .maxlen = sizeof(enum sched_tunable_scaling), 346 .mode = 0644, 347 .proc_handler = sched_proc_update_handler, 348 .extra1 = &min_sched_tunable_scaling, 349 .extra2 = &max_sched_tunable_scaling, 350 }, 351 { 352 .procname = "sched_migration_cost_ns", 353 .data = &sysctl_sched_migration_cost, 354 .maxlen = sizeof(unsigned int), 355 .mode = 0644, 356 .proc_handler = proc_dointvec, 357 }, 358 { 359 .procname = "sched_nr_migrate", 360 .data = &sysctl_sched_nr_migrate, 361 .maxlen = sizeof(unsigned int), 362 .mode = 0644, 363 .proc_handler = proc_dointvec, 364 }, 365 { 366 .procname = "sched_time_avg_ms", 367 .data = &sysctl_sched_time_avg, 368 .maxlen = sizeof(unsigned int), 369 .mode = 0644, 370 .proc_handler = proc_dointvec_minmax, 371 .extra1 = &one, 372 }, 373 #ifdef CONFIG_SCHEDSTATS 374 { 375 .procname = "sched_schedstats", 376 .data = NULL, 377 .maxlen = sizeof(unsigned int), 378 .mode = 0644, 379 .proc_handler = sysctl_schedstats, 380 .extra1 = &zero, 381 .extra2 = &one, 382 }, 383 #endif /* CONFIG_SCHEDSTATS */ 384 #endif /* CONFIG_SMP */ 385 #ifdef CONFIG_NUMA_BALANCING 386 { 387 .procname = "numa_balancing_scan_delay_ms", 388 .data = &sysctl_numa_balancing_scan_delay, 389 .maxlen = sizeof(unsigned int), 390 .mode = 0644, 391 .proc_handler = proc_dointvec, 392 }, 393 { 394 .procname = "numa_balancing_scan_period_min_ms", 395 .data = &sysctl_numa_balancing_scan_period_min, 396 .maxlen = sizeof(unsigned int), 397 .mode = 0644, 398 .proc_handler = proc_dointvec, 399 }, 400 { 401 .procname = "numa_balancing_scan_period_max_ms", 402 .data = &sysctl_numa_balancing_scan_period_max, 403 .maxlen = sizeof(unsigned int), 404 .mode = 0644, 405 .proc_handler = proc_dointvec, 406 }, 407 { 408 .procname = "numa_balancing_scan_size_mb", 409 .data = &sysctl_numa_balancing_scan_size, 410 .maxlen = sizeof(unsigned int), 411 .mode = 0644, 412 .proc_handler = proc_dointvec_minmax, 413 .extra1 = &one, 414 }, 415 { 416 .procname = "numa_balancing", 417 .data = NULL, /* filled in by handler */ 418 .maxlen = sizeof(unsigned int), 419 .mode = 0644, 420 .proc_handler = sysctl_numa_balancing, 421 .extra1 = &zero, 422 .extra2 = &one, 423 }, 424 #endif /* CONFIG_NUMA_BALANCING */ 425 #endif /* CONFIG_SCHED_DEBUG */ 426 { 427 .procname = "sched_rt_period_us", 428 .data = &sysctl_sched_rt_period, 429 .maxlen = sizeof(unsigned int), 430 .mode = 0644, 431 .proc_handler = sched_rt_handler, 432 }, 433 { 434 .procname = "sched_rt_runtime_us", 435 .data = &sysctl_sched_rt_runtime, 436 .maxlen = sizeof(int), 437 .mode = 0644, 438 .proc_handler = sched_rt_handler, 439 }, 440 { 441 .procname = "sched_rr_timeslice_ms", 442 .data = &sysctl_sched_rr_timeslice, 443 .maxlen = sizeof(int), 444 .mode = 0644, 445 .proc_handler = sched_rr_handler, 446 }, 447 #ifdef CONFIG_SCHED_AUTOGROUP 448 { 449 .procname = "sched_autogroup_enabled", 450 .data = &sysctl_sched_autogroup_enabled, 451 .maxlen = sizeof(unsigned int), 452 .mode = 0644, 453 .proc_handler = proc_dointvec_minmax, 454 .extra1 = &zero, 455 .extra2 = &one, 456 }, 457 #endif 458 #ifdef CONFIG_CFS_BANDWIDTH 459 { 460 .procname = "sched_cfs_bandwidth_slice_us", 461 .data = &sysctl_sched_cfs_bandwidth_slice, 462 .maxlen = sizeof(unsigned int), 463 .mode = 0644, 464 .proc_handler = proc_dointvec_minmax, 465 .extra1 = &one, 466 }, 467 #endif 468 #ifdef CONFIG_PROVE_LOCKING 469 { 470 .procname = "prove_locking", 471 .data = &prove_locking, 472 .maxlen = sizeof(int), 473 .mode = 0644, 474 .proc_handler = proc_dointvec, 475 }, 476 #endif 477 #ifdef CONFIG_LOCK_STAT 478 { 479 .procname = "lock_stat", 480 .data = &lock_stat, 481 .maxlen = sizeof(int), 482 .mode = 0644, 483 .proc_handler = proc_dointvec, 484 }, 485 #endif 486 { 487 .procname = "panic", 488 .data = &panic_timeout, 489 .maxlen = sizeof(int), 490 .mode = 0644, 491 .proc_handler = proc_dointvec, 492 }, 493 #ifdef CONFIG_COREDUMP 494 { 495 .procname = "core_uses_pid", 496 .data = &core_uses_pid, 497 .maxlen = sizeof(int), 498 .mode = 0644, 499 .proc_handler = proc_dointvec, 500 }, 501 { 502 .procname = "core_pattern", 503 .data = core_pattern, 504 .maxlen = CORENAME_MAX_SIZE, 505 .mode = 0644, 506 .proc_handler = proc_dostring_coredump, 507 }, 508 { 509 .procname = "core_pipe_limit", 510 .data = &core_pipe_limit, 511 .maxlen = sizeof(unsigned int), 512 .mode = 0644, 513 .proc_handler = proc_dointvec, 514 }, 515 #endif 516 #ifdef CONFIG_PROC_SYSCTL 517 { 518 .procname = "tainted", 519 .maxlen = sizeof(long), 520 .mode = 0644, 521 .proc_handler = proc_taint, 522 }, 523 { 524 .procname = "sysctl_writes_strict", 525 .data = &sysctl_writes_strict, 526 .maxlen = sizeof(int), 527 .mode = 0644, 528 .proc_handler = proc_dointvec_minmax, 529 .extra1 = &neg_one, 530 .extra2 = &one, 531 }, 532 #endif 533 #ifdef CONFIG_LATENCYTOP 534 { 535 .procname = "latencytop", 536 .data = &latencytop_enabled, 537 .maxlen = sizeof(int), 538 .mode = 0644, 539 .proc_handler = sysctl_latencytop, 540 }, 541 #endif 542 #ifdef CONFIG_BLK_DEV_INITRD 543 { 544 .procname = "real-root-dev", 545 .data = &real_root_dev, 546 .maxlen = sizeof(int), 547 .mode = 0644, 548 .proc_handler = proc_dointvec, 549 }, 550 #endif 551 { 552 .procname = "print-fatal-signals", 553 .data = &print_fatal_signals, 554 .maxlen = sizeof(int), 555 .mode = 0644, 556 .proc_handler = proc_dointvec, 557 }, 558 #ifdef CONFIG_SPARC 559 { 560 .procname = "reboot-cmd", 561 .data = reboot_command, 562 .maxlen = 256, 563 .mode = 0644, 564 .proc_handler = proc_dostring, 565 }, 566 { 567 .procname = "stop-a", 568 .data = &stop_a_enabled, 569 .maxlen = sizeof (int), 570 .mode = 0644, 571 .proc_handler = proc_dointvec, 572 }, 573 { 574 .procname = "scons-poweroff", 575 .data = &scons_pwroff, 576 .maxlen = sizeof (int), 577 .mode = 0644, 578 .proc_handler = proc_dointvec, 579 }, 580 #endif 581 #ifdef CONFIG_SPARC64 582 { 583 .procname = "tsb-ratio", 584 .data = &sysctl_tsb_ratio, 585 .maxlen = sizeof (int), 586 .mode = 0644, 587 .proc_handler = proc_dointvec, 588 }, 589 #endif 590 #ifdef __hppa__ 591 { 592 .procname = "soft-power", 593 .data = &pwrsw_enabled, 594 .maxlen = sizeof (int), 595 .mode = 0644, 596 .proc_handler = proc_dointvec, 597 }, 598 #endif 599 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 600 { 601 .procname = "unaligned-trap", 602 .data = &unaligned_enabled, 603 .maxlen = sizeof (int), 604 .mode = 0644, 605 .proc_handler = proc_dointvec, 606 }, 607 #endif 608 { 609 .procname = "ctrl-alt-del", 610 .data = &C_A_D, 611 .maxlen = sizeof(int), 612 .mode = 0644, 613 .proc_handler = proc_dointvec, 614 }, 615 #ifdef CONFIG_FUNCTION_TRACER 616 { 617 .procname = "ftrace_enabled", 618 .data = &ftrace_enabled, 619 .maxlen = sizeof(int), 620 .mode = 0644, 621 .proc_handler = ftrace_enable_sysctl, 622 }, 623 #endif 624 #ifdef CONFIG_STACK_TRACER 625 { 626 .procname = "stack_tracer_enabled", 627 .data = &stack_tracer_enabled, 628 .maxlen = sizeof(int), 629 .mode = 0644, 630 .proc_handler = stack_trace_sysctl, 631 }, 632 #endif 633 #ifdef CONFIG_TRACING 634 { 635 .procname = "ftrace_dump_on_oops", 636 .data = &ftrace_dump_on_oops, 637 .maxlen = sizeof(int), 638 .mode = 0644, 639 .proc_handler = proc_dointvec, 640 }, 641 { 642 .procname = "traceoff_on_warning", 643 .data = &__disable_trace_on_warning, 644 .maxlen = sizeof(__disable_trace_on_warning), 645 .mode = 0644, 646 .proc_handler = proc_dointvec, 647 }, 648 { 649 .procname = "tracepoint_printk", 650 .data = &tracepoint_printk, 651 .maxlen = sizeof(tracepoint_printk), 652 .mode = 0644, 653 .proc_handler = tracepoint_printk_sysctl, 654 }, 655 #endif 656 #ifdef CONFIG_KEXEC_CORE 657 { 658 .procname = "kexec_load_disabled", 659 .data = &kexec_load_disabled, 660 .maxlen = sizeof(int), 661 .mode = 0644, 662 /* only handle a transition from default "0" to "1" */ 663 .proc_handler = proc_dointvec_minmax, 664 .extra1 = &one, 665 .extra2 = &one, 666 }, 667 #endif 668 #ifdef CONFIG_MODULES 669 { 670 .procname = "modprobe", 671 .data = &modprobe_path, 672 .maxlen = KMOD_PATH_LEN, 673 .mode = 0644, 674 .proc_handler = proc_dostring, 675 }, 676 { 677 .procname = "modules_disabled", 678 .data = &modules_disabled, 679 .maxlen = sizeof(int), 680 .mode = 0644, 681 /* only handle a transition from default "0" to "1" */ 682 .proc_handler = proc_dointvec_minmax, 683 .extra1 = &one, 684 .extra2 = &one, 685 }, 686 #endif 687 #ifdef CONFIG_UEVENT_HELPER 688 { 689 .procname = "hotplug", 690 .data = &uevent_helper, 691 .maxlen = UEVENT_HELPER_PATH_LEN, 692 .mode = 0644, 693 .proc_handler = proc_dostring, 694 }, 695 #endif 696 #ifdef CONFIG_CHR_DEV_SG 697 { 698 .procname = "sg-big-buff", 699 .data = &sg_big_buff, 700 .maxlen = sizeof (int), 701 .mode = 0444, 702 .proc_handler = proc_dointvec, 703 }, 704 #endif 705 #ifdef CONFIG_BSD_PROCESS_ACCT 706 { 707 .procname = "acct", 708 .data = &acct_parm, 709 .maxlen = 3*sizeof(int), 710 .mode = 0644, 711 .proc_handler = proc_dointvec, 712 }, 713 #endif 714 #ifdef CONFIG_MAGIC_SYSRQ 715 { 716 .procname = "sysrq", 717 .data = &__sysrq_enabled, 718 .maxlen = sizeof (int), 719 .mode = 0644, 720 .proc_handler = sysrq_sysctl_handler, 721 }, 722 #endif 723 #ifdef CONFIG_PROC_SYSCTL 724 { 725 .procname = "cad_pid", 726 .data = NULL, 727 .maxlen = sizeof (int), 728 .mode = 0600, 729 .proc_handler = proc_do_cad_pid, 730 }, 731 #endif 732 { 733 .procname = "threads-max", 734 .data = NULL, 735 .maxlen = sizeof(int), 736 .mode = 0644, 737 .proc_handler = sysctl_max_threads, 738 }, 739 { 740 .procname = "random", 741 .mode = 0555, 742 .child = random_table, 743 }, 744 { 745 .procname = "usermodehelper", 746 .mode = 0555, 747 .child = usermodehelper_table, 748 }, 749 { 750 .procname = "overflowuid", 751 .data = &overflowuid, 752 .maxlen = sizeof(int), 753 .mode = 0644, 754 .proc_handler = proc_dointvec_minmax, 755 .extra1 = &minolduid, 756 .extra2 = &maxolduid, 757 }, 758 { 759 .procname = "overflowgid", 760 .data = &overflowgid, 761 .maxlen = sizeof(int), 762 .mode = 0644, 763 .proc_handler = proc_dointvec_minmax, 764 .extra1 = &minolduid, 765 .extra2 = &maxolduid, 766 }, 767 #ifdef CONFIG_S390 768 #ifdef CONFIG_MATHEMU 769 { 770 .procname = "ieee_emulation_warnings", 771 .data = &sysctl_ieee_emulation_warnings, 772 .maxlen = sizeof(int), 773 .mode = 0644, 774 .proc_handler = proc_dointvec, 775 }, 776 #endif 777 { 778 .procname = "userprocess_debug", 779 .data = &show_unhandled_signals, 780 .maxlen = sizeof(int), 781 .mode = 0644, 782 .proc_handler = proc_dointvec, 783 }, 784 #endif 785 { 786 .procname = "pid_max", 787 .data = &pid_max, 788 .maxlen = sizeof (int), 789 .mode = 0644, 790 .proc_handler = proc_dointvec_minmax, 791 .extra1 = &pid_max_min, 792 .extra2 = &pid_max_max, 793 }, 794 { 795 .procname = "panic_on_oops", 796 .data = &panic_on_oops, 797 .maxlen = sizeof(int), 798 .mode = 0644, 799 .proc_handler = proc_dointvec, 800 }, 801 #if defined CONFIG_PRINTK 802 { 803 .procname = "printk", 804 .data = &console_loglevel, 805 .maxlen = 4*sizeof(int), 806 .mode = 0644, 807 .proc_handler = proc_dointvec, 808 }, 809 { 810 .procname = "printk_ratelimit", 811 .data = &printk_ratelimit_state.interval, 812 .maxlen = sizeof(int), 813 .mode = 0644, 814 .proc_handler = proc_dointvec_jiffies, 815 }, 816 { 817 .procname = "printk_ratelimit_burst", 818 .data = &printk_ratelimit_state.burst, 819 .maxlen = sizeof(int), 820 .mode = 0644, 821 .proc_handler = proc_dointvec, 822 }, 823 { 824 .procname = "printk_delay", 825 .data = &printk_delay_msec, 826 .maxlen = sizeof(int), 827 .mode = 0644, 828 .proc_handler = proc_dointvec_minmax, 829 .extra1 = &zero, 830 .extra2 = &ten_thousand, 831 }, 832 { 833 .procname = "printk_devkmsg", 834 .data = devkmsg_log_str, 835 .maxlen = DEVKMSG_STR_MAX_SIZE, 836 .mode = 0644, 837 .proc_handler = devkmsg_sysctl_set_loglvl, 838 }, 839 { 840 .procname = "dmesg_restrict", 841 .data = &dmesg_restrict, 842 .maxlen = sizeof(int), 843 .mode = 0644, 844 .proc_handler = proc_dointvec_minmax_sysadmin, 845 .extra1 = &zero, 846 .extra2 = &one, 847 }, 848 { 849 .procname = "kptr_restrict", 850 .data = &kptr_restrict, 851 .maxlen = sizeof(int), 852 .mode = 0644, 853 .proc_handler = proc_dointvec_minmax_sysadmin, 854 .extra1 = &zero, 855 .extra2 = &two, 856 }, 857 #endif 858 { 859 .procname = "ngroups_max", 860 .data = &ngroups_max, 861 .maxlen = sizeof (int), 862 .mode = 0444, 863 .proc_handler = proc_dointvec, 864 }, 865 { 866 .procname = "cap_last_cap", 867 .data = (void *)&cap_last_cap, 868 .maxlen = sizeof(int), 869 .mode = 0444, 870 .proc_handler = proc_dointvec, 871 }, 872 #if defined(CONFIG_LOCKUP_DETECTOR) 873 { 874 .procname = "watchdog", 875 .data = &watchdog_user_enabled, 876 .maxlen = sizeof(int), 877 .mode = 0644, 878 .proc_handler = proc_watchdog, 879 .extra1 = &zero, 880 .extra2 = &one, 881 }, 882 { 883 .procname = "watchdog_thresh", 884 .data = &watchdog_thresh, 885 .maxlen = sizeof(int), 886 .mode = 0644, 887 .proc_handler = proc_watchdog_thresh, 888 .extra1 = &zero, 889 .extra2 = &sixty, 890 }, 891 { 892 .procname = "nmi_watchdog", 893 .data = &nmi_watchdog_user_enabled, 894 .maxlen = sizeof(int), 895 .mode = NMI_WATCHDOG_SYSCTL_PERM, 896 .proc_handler = proc_nmi_watchdog, 897 .extra1 = &zero, 898 .extra2 = &one, 899 }, 900 { 901 .procname = "watchdog_cpumask", 902 .data = &watchdog_cpumask_bits, 903 .maxlen = NR_CPUS, 904 .mode = 0644, 905 .proc_handler = proc_watchdog_cpumask, 906 }, 907 #ifdef CONFIG_SOFTLOCKUP_DETECTOR 908 { 909 .procname = "soft_watchdog", 910 .data = &soft_watchdog_user_enabled, 911 .maxlen = sizeof(int), 912 .mode = 0644, 913 .proc_handler = proc_soft_watchdog, 914 .extra1 = &zero, 915 .extra2 = &one, 916 }, 917 { 918 .procname = "softlockup_panic", 919 .data = &softlockup_panic, 920 .maxlen = sizeof(int), 921 .mode = 0644, 922 .proc_handler = proc_dointvec_minmax, 923 .extra1 = &zero, 924 .extra2 = &one, 925 }, 926 #ifdef CONFIG_SMP 927 { 928 .procname = "softlockup_all_cpu_backtrace", 929 .data = &sysctl_softlockup_all_cpu_backtrace, 930 .maxlen = sizeof(int), 931 .mode = 0644, 932 .proc_handler = proc_dointvec_minmax, 933 .extra1 = &zero, 934 .extra2 = &one, 935 }, 936 #endif /* CONFIG_SMP */ 937 #endif 938 #ifdef CONFIG_HARDLOCKUP_DETECTOR 939 { 940 .procname = "hardlockup_panic", 941 .data = &hardlockup_panic, 942 .maxlen = sizeof(int), 943 .mode = 0644, 944 .proc_handler = proc_dointvec_minmax, 945 .extra1 = &zero, 946 .extra2 = &one, 947 }, 948 #ifdef CONFIG_SMP 949 { 950 .procname = "hardlockup_all_cpu_backtrace", 951 .data = &sysctl_hardlockup_all_cpu_backtrace, 952 .maxlen = sizeof(int), 953 .mode = 0644, 954 .proc_handler = proc_dointvec_minmax, 955 .extra1 = &zero, 956 .extra2 = &one, 957 }, 958 #endif /* CONFIG_SMP */ 959 #endif 960 #endif 961 962 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 963 { 964 .procname = "unknown_nmi_panic", 965 .data = &unknown_nmi_panic, 966 .maxlen = sizeof (int), 967 .mode = 0644, 968 .proc_handler = proc_dointvec, 969 }, 970 #endif 971 #if defined(CONFIG_X86) 972 { 973 .procname = "panic_on_unrecovered_nmi", 974 .data = &panic_on_unrecovered_nmi, 975 .maxlen = sizeof(int), 976 .mode = 0644, 977 .proc_handler = proc_dointvec, 978 }, 979 { 980 .procname = "panic_on_io_nmi", 981 .data = &panic_on_io_nmi, 982 .maxlen = sizeof(int), 983 .mode = 0644, 984 .proc_handler = proc_dointvec, 985 }, 986 #ifdef CONFIG_DEBUG_STACKOVERFLOW 987 { 988 .procname = "panic_on_stackoverflow", 989 .data = &sysctl_panic_on_stackoverflow, 990 .maxlen = sizeof(int), 991 .mode = 0644, 992 .proc_handler = proc_dointvec, 993 }, 994 #endif 995 { 996 .procname = "bootloader_type", 997 .data = &bootloader_type, 998 .maxlen = sizeof (int), 999 .mode = 0444, 1000 .proc_handler = proc_dointvec, 1001 }, 1002 { 1003 .procname = "bootloader_version", 1004 .data = &bootloader_version, 1005 .maxlen = sizeof (int), 1006 .mode = 0444, 1007 .proc_handler = proc_dointvec, 1008 }, 1009 { 1010 .procname = "io_delay_type", 1011 .data = &io_delay_type, 1012 .maxlen = sizeof(int), 1013 .mode = 0644, 1014 .proc_handler = proc_dointvec, 1015 }, 1016 #endif 1017 #if defined(CONFIG_MMU) 1018 { 1019 .procname = "randomize_va_space", 1020 .data = &randomize_va_space, 1021 .maxlen = sizeof(int), 1022 .mode = 0644, 1023 .proc_handler = proc_dointvec, 1024 }, 1025 #endif 1026 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1027 { 1028 .procname = "spin_retry", 1029 .data = &spin_retry, 1030 .maxlen = sizeof (int), 1031 .mode = 0644, 1032 .proc_handler = proc_dointvec, 1033 }, 1034 #endif 1035 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1036 { 1037 .procname = "acpi_video_flags", 1038 .data = &acpi_realmode_flags, 1039 .maxlen = sizeof (unsigned long), 1040 .mode = 0644, 1041 .proc_handler = proc_doulongvec_minmax, 1042 }, 1043 #endif 1044 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1045 { 1046 .procname = "ignore-unaligned-usertrap", 1047 .data = &no_unaligned_warning, 1048 .maxlen = sizeof (int), 1049 .mode = 0644, 1050 .proc_handler = proc_dointvec, 1051 }, 1052 #endif 1053 #ifdef CONFIG_IA64 1054 { 1055 .procname = "unaligned-dump-stack", 1056 .data = &unaligned_dump_stack, 1057 .maxlen = sizeof (int), 1058 .mode = 0644, 1059 .proc_handler = proc_dointvec, 1060 }, 1061 #endif 1062 #ifdef CONFIG_DETECT_HUNG_TASK 1063 { 1064 .procname = "hung_task_panic", 1065 .data = &sysctl_hung_task_panic, 1066 .maxlen = sizeof(int), 1067 .mode = 0644, 1068 .proc_handler = proc_dointvec_minmax, 1069 .extra1 = &zero, 1070 .extra2 = &one, 1071 }, 1072 { 1073 .procname = "hung_task_check_count", 1074 .data = &sysctl_hung_task_check_count, 1075 .maxlen = sizeof(int), 1076 .mode = 0644, 1077 .proc_handler = proc_dointvec_minmax, 1078 .extra1 = &zero, 1079 }, 1080 { 1081 .procname = "hung_task_timeout_secs", 1082 .data = &sysctl_hung_task_timeout_secs, 1083 .maxlen = sizeof(unsigned long), 1084 .mode = 0644, 1085 .proc_handler = proc_dohung_task_timeout_secs, 1086 .extra2 = &hung_task_timeout_max, 1087 }, 1088 { 1089 .procname = "hung_task_warnings", 1090 .data = &sysctl_hung_task_warnings, 1091 .maxlen = sizeof(int), 1092 .mode = 0644, 1093 .proc_handler = proc_dointvec_minmax, 1094 .extra1 = &neg_one, 1095 }, 1096 #endif 1097 #ifdef CONFIG_RT_MUTEXES 1098 { 1099 .procname = "max_lock_depth", 1100 .data = &max_lock_depth, 1101 .maxlen = sizeof(int), 1102 .mode = 0644, 1103 .proc_handler = proc_dointvec, 1104 }, 1105 #endif 1106 { 1107 .procname = "poweroff_cmd", 1108 .data = &poweroff_cmd, 1109 .maxlen = POWEROFF_CMD_PATH_LEN, 1110 .mode = 0644, 1111 .proc_handler = proc_dostring, 1112 }, 1113 #ifdef CONFIG_KEYS 1114 { 1115 .procname = "keys", 1116 .mode = 0555, 1117 .child = key_sysctls, 1118 }, 1119 #endif 1120 #ifdef CONFIG_PERF_EVENTS 1121 /* 1122 * User-space scripts rely on the existence of this file 1123 * as a feature check for perf_events being enabled. 1124 * 1125 * So it's an ABI, do not remove! 1126 */ 1127 { 1128 .procname = "perf_event_paranoid", 1129 .data = &sysctl_perf_event_paranoid, 1130 .maxlen = sizeof(sysctl_perf_event_paranoid), 1131 .mode = 0644, 1132 .proc_handler = proc_dointvec, 1133 }, 1134 { 1135 .procname = "perf_event_mlock_kb", 1136 .data = &sysctl_perf_event_mlock, 1137 .maxlen = sizeof(sysctl_perf_event_mlock), 1138 .mode = 0644, 1139 .proc_handler = proc_dointvec, 1140 }, 1141 { 1142 .procname = "perf_event_max_sample_rate", 1143 .data = &sysctl_perf_event_sample_rate, 1144 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1145 .mode = 0644, 1146 .proc_handler = perf_proc_update_handler, 1147 .extra1 = &one, 1148 }, 1149 { 1150 .procname = "perf_cpu_time_max_percent", 1151 .data = &sysctl_perf_cpu_time_max_percent, 1152 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1153 .mode = 0644, 1154 .proc_handler = perf_cpu_time_max_percent_handler, 1155 .extra1 = &zero, 1156 .extra2 = &one_hundred, 1157 }, 1158 { 1159 .procname = "perf_event_max_stack", 1160 .data = &sysctl_perf_event_max_stack, 1161 .maxlen = sizeof(sysctl_perf_event_max_stack), 1162 .mode = 0644, 1163 .proc_handler = perf_event_max_stack_handler, 1164 .extra1 = &zero, 1165 .extra2 = &six_hundred_forty_kb, 1166 }, 1167 { 1168 .procname = "perf_event_max_contexts_per_stack", 1169 .data = &sysctl_perf_event_max_contexts_per_stack, 1170 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1171 .mode = 0644, 1172 .proc_handler = perf_event_max_stack_handler, 1173 .extra1 = &zero, 1174 .extra2 = &one_thousand, 1175 }, 1176 #endif 1177 { 1178 .procname = "panic_on_warn", 1179 .data = &panic_on_warn, 1180 .maxlen = sizeof(int), 1181 .mode = 0644, 1182 .proc_handler = proc_dointvec_minmax, 1183 .extra1 = &zero, 1184 .extra2 = &one, 1185 }, 1186 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1187 { 1188 .procname = "timer_migration", 1189 .data = &sysctl_timer_migration, 1190 .maxlen = sizeof(unsigned int), 1191 .mode = 0644, 1192 .proc_handler = timer_migration_handler, 1193 .extra1 = &zero, 1194 .extra2 = &one, 1195 }, 1196 #endif 1197 #ifdef CONFIG_BPF_SYSCALL 1198 { 1199 .procname = "unprivileged_bpf_disabled", 1200 .data = &sysctl_unprivileged_bpf_disabled, 1201 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1202 .mode = 0644, 1203 /* only handle a transition from default "0" to "1" */ 1204 .proc_handler = proc_dointvec_minmax, 1205 .extra1 = &one, 1206 .extra2 = &one, 1207 }, 1208 #endif 1209 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1210 { 1211 .procname = "panic_on_rcu_stall", 1212 .data = &sysctl_panic_on_rcu_stall, 1213 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1214 .mode = 0644, 1215 .proc_handler = proc_dointvec_minmax, 1216 .extra1 = &zero, 1217 .extra2 = &one, 1218 }, 1219 #endif 1220 { } 1221 }; 1222 1223 static struct ctl_table vm_table[] = { 1224 { 1225 .procname = "overcommit_memory", 1226 .data = &sysctl_overcommit_memory, 1227 .maxlen = sizeof(sysctl_overcommit_memory), 1228 .mode = 0644, 1229 .proc_handler = proc_dointvec_minmax, 1230 .extra1 = &zero, 1231 .extra2 = &two, 1232 }, 1233 { 1234 .procname = "panic_on_oom", 1235 .data = &sysctl_panic_on_oom, 1236 .maxlen = sizeof(sysctl_panic_on_oom), 1237 .mode = 0644, 1238 .proc_handler = proc_dointvec_minmax, 1239 .extra1 = &zero, 1240 .extra2 = &two, 1241 }, 1242 { 1243 .procname = "oom_kill_allocating_task", 1244 .data = &sysctl_oom_kill_allocating_task, 1245 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1246 .mode = 0644, 1247 .proc_handler = proc_dointvec, 1248 }, 1249 { 1250 .procname = "oom_dump_tasks", 1251 .data = &sysctl_oom_dump_tasks, 1252 .maxlen = sizeof(sysctl_oom_dump_tasks), 1253 .mode = 0644, 1254 .proc_handler = proc_dointvec, 1255 }, 1256 { 1257 .procname = "overcommit_ratio", 1258 .data = &sysctl_overcommit_ratio, 1259 .maxlen = sizeof(sysctl_overcommit_ratio), 1260 .mode = 0644, 1261 .proc_handler = overcommit_ratio_handler, 1262 }, 1263 { 1264 .procname = "overcommit_kbytes", 1265 .data = &sysctl_overcommit_kbytes, 1266 .maxlen = sizeof(sysctl_overcommit_kbytes), 1267 .mode = 0644, 1268 .proc_handler = overcommit_kbytes_handler, 1269 }, 1270 { 1271 .procname = "page-cluster", 1272 .data = &page_cluster, 1273 .maxlen = sizeof(int), 1274 .mode = 0644, 1275 .proc_handler = proc_dointvec_minmax, 1276 .extra1 = &zero, 1277 }, 1278 { 1279 .procname = "dirty_background_ratio", 1280 .data = &dirty_background_ratio, 1281 .maxlen = sizeof(dirty_background_ratio), 1282 .mode = 0644, 1283 .proc_handler = dirty_background_ratio_handler, 1284 .extra1 = &zero, 1285 .extra2 = &one_hundred, 1286 }, 1287 { 1288 .procname = "dirty_background_bytes", 1289 .data = &dirty_background_bytes, 1290 .maxlen = sizeof(dirty_background_bytes), 1291 .mode = 0644, 1292 .proc_handler = dirty_background_bytes_handler, 1293 .extra1 = &one_ul, 1294 }, 1295 { 1296 .procname = "dirty_ratio", 1297 .data = &vm_dirty_ratio, 1298 .maxlen = sizeof(vm_dirty_ratio), 1299 .mode = 0644, 1300 .proc_handler = dirty_ratio_handler, 1301 .extra1 = &zero, 1302 .extra2 = &one_hundred, 1303 }, 1304 { 1305 .procname = "dirty_bytes", 1306 .data = &vm_dirty_bytes, 1307 .maxlen = sizeof(vm_dirty_bytes), 1308 .mode = 0644, 1309 .proc_handler = dirty_bytes_handler, 1310 .extra1 = &dirty_bytes_min, 1311 }, 1312 { 1313 .procname = "dirty_writeback_centisecs", 1314 .data = &dirty_writeback_interval, 1315 .maxlen = sizeof(dirty_writeback_interval), 1316 .mode = 0644, 1317 .proc_handler = dirty_writeback_centisecs_handler, 1318 }, 1319 { 1320 .procname = "dirty_expire_centisecs", 1321 .data = &dirty_expire_interval, 1322 .maxlen = sizeof(dirty_expire_interval), 1323 .mode = 0644, 1324 .proc_handler = proc_dointvec_minmax, 1325 .extra1 = &zero, 1326 }, 1327 { 1328 .procname = "dirtytime_expire_seconds", 1329 .data = &dirtytime_expire_interval, 1330 .maxlen = sizeof(dirty_expire_interval), 1331 .mode = 0644, 1332 .proc_handler = dirtytime_interval_handler, 1333 .extra1 = &zero, 1334 }, 1335 { 1336 .procname = "swappiness", 1337 .data = &vm_swappiness, 1338 .maxlen = sizeof(vm_swappiness), 1339 .mode = 0644, 1340 .proc_handler = proc_dointvec_minmax, 1341 .extra1 = &zero, 1342 .extra2 = &one_hundred, 1343 }, 1344 #ifdef CONFIG_HUGETLB_PAGE 1345 { 1346 .procname = "nr_hugepages", 1347 .data = NULL, 1348 .maxlen = sizeof(unsigned long), 1349 .mode = 0644, 1350 .proc_handler = hugetlb_sysctl_handler, 1351 }, 1352 #ifdef CONFIG_NUMA 1353 { 1354 .procname = "nr_hugepages_mempolicy", 1355 .data = NULL, 1356 .maxlen = sizeof(unsigned long), 1357 .mode = 0644, 1358 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1359 }, 1360 { 1361 .procname = "numa_stat", 1362 .data = &sysctl_vm_numa_stat, 1363 .maxlen = sizeof(int), 1364 .mode = 0644, 1365 .proc_handler = sysctl_vm_numa_stat_handler, 1366 .extra1 = &zero, 1367 .extra2 = &one, 1368 }, 1369 #endif 1370 { 1371 .procname = "hugetlb_shm_group", 1372 .data = &sysctl_hugetlb_shm_group, 1373 .maxlen = sizeof(gid_t), 1374 .mode = 0644, 1375 .proc_handler = proc_dointvec, 1376 }, 1377 { 1378 .procname = "hugepages_treat_as_movable", 1379 .data = &hugepages_treat_as_movable, 1380 .maxlen = sizeof(int), 1381 .mode = 0644, 1382 .proc_handler = proc_dointvec, 1383 }, 1384 { 1385 .procname = "nr_overcommit_hugepages", 1386 .data = NULL, 1387 .maxlen = sizeof(unsigned long), 1388 .mode = 0644, 1389 .proc_handler = hugetlb_overcommit_handler, 1390 }, 1391 #endif 1392 { 1393 .procname = "lowmem_reserve_ratio", 1394 .data = &sysctl_lowmem_reserve_ratio, 1395 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1396 .mode = 0644, 1397 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1398 }, 1399 { 1400 .procname = "drop_caches", 1401 .data = &sysctl_drop_caches, 1402 .maxlen = sizeof(int), 1403 .mode = 0644, 1404 .proc_handler = drop_caches_sysctl_handler, 1405 .extra1 = &one, 1406 .extra2 = &four, 1407 }, 1408 #ifdef CONFIG_COMPACTION 1409 { 1410 .procname = "compact_memory", 1411 .data = &sysctl_compact_memory, 1412 .maxlen = sizeof(int), 1413 .mode = 0200, 1414 .proc_handler = sysctl_compaction_handler, 1415 }, 1416 { 1417 .procname = "extfrag_threshold", 1418 .data = &sysctl_extfrag_threshold, 1419 .maxlen = sizeof(int), 1420 .mode = 0644, 1421 .proc_handler = sysctl_extfrag_handler, 1422 .extra1 = &min_extfrag_threshold, 1423 .extra2 = &max_extfrag_threshold, 1424 }, 1425 { 1426 .procname = "compact_unevictable_allowed", 1427 .data = &sysctl_compact_unevictable_allowed, 1428 .maxlen = sizeof(int), 1429 .mode = 0644, 1430 .proc_handler = proc_dointvec, 1431 .extra1 = &zero, 1432 .extra2 = &one, 1433 }, 1434 1435 #endif /* CONFIG_COMPACTION */ 1436 { 1437 .procname = "min_free_kbytes", 1438 .data = &min_free_kbytes, 1439 .maxlen = sizeof(min_free_kbytes), 1440 .mode = 0644, 1441 .proc_handler = min_free_kbytes_sysctl_handler, 1442 .extra1 = &zero, 1443 }, 1444 { 1445 .procname = "watermark_scale_factor", 1446 .data = &watermark_scale_factor, 1447 .maxlen = sizeof(watermark_scale_factor), 1448 .mode = 0644, 1449 .proc_handler = watermark_scale_factor_sysctl_handler, 1450 .extra1 = &one, 1451 .extra2 = &one_thousand, 1452 }, 1453 { 1454 .procname = "percpu_pagelist_fraction", 1455 .data = &percpu_pagelist_fraction, 1456 .maxlen = sizeof(percpu_pagelist_fraction), 1457 .mode = 0644, 1458 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1459 .extra1 = &zero, 1460 }, 1461 #ifdef CONFIG_MMU 1462 { 1463 .procname = "max_map_count", 1464 .data = &sysctl_max_map_count, 1465 .maxlen = sizeof(sysctl_max_map_count), 1466 .mode = 0644, 1467 .proc_handler = proc_dointvec_minmax, 1468 .extra1 = &zero, 1469 }, 1470 #else 1471 { 1472 .procname = "nr_trim_pages", 1473 .data = &sysctl_nr_trim_pages, 1474 .maxlen = sizeof(sysctl_nr_trim_pages), 1475 .mode = 0644, 1476 .proc_handler = proc_dointvec_minmax, 1477 .extra1 = &zero, 1478 }, 1479 #endif 1480 { 1481 .procname = "laptop_mode", 1482 .data = &laptop_mode, 1483 .maxlen = sizeof(laptop_mode), 1484 .mode = 0644, 1485 .proc_handler = proc_dointvec_jiffies, 1486 }, 1487 { 1488 .procname = "block_dump", 1489 .data = &block_dump, 1490 .maxlen = sizeof(block_dump), 1491 .mode = 0644, 1492 .proc_handler = proc_dointvec, 1493 .extra1 = &zero, 1494 }, 1495 { 1496 .procname = "vfs_cache_pressure", 1497 .data = &sysctl_vfs_cache_pressure, 1498 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1499 .mode = 0644, 1500 .proc_handler = proc_dointvec, 1501 .extra1 = &zero, 1502 }, 1503 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1504 { 1505 .procname = "legacy_va_layout", 1506 .data = &sysctl_legacy_va_layout, 1507 .maxlen = sizeof(sysctl_legacy_va_layout), 1508 .mode = 0644, 1509 .proc_handler = proc_dointvec, 1510 .extra1 = &zero, 1511 }, 1512 #endif 1513 #ifdef CONFIG_NUMA 1514 { 1515 .procname = "zone_reclaim_mode", 1516 .data = &node_reclaim_mode, 1517 .maxlen = sizeof(node_reclaim_mode), 1518 .mode = 0644, 1519 .proc_handler = proc_dointvec, 1520 .extra1 = &zero, 1521 }, 1522 { 1523 .procname = "min_unmapped_ratio", 1524 .data = &sysctl_min_unmapped_ratio, 1525 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1526 .mode = 0644, 1527 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1528 .extra1 = &zero, 1529 .extra2 = &one_hundred, 1530 }, 1531 { 1532 .procname = "min_slab_ratio", 1533 .data = &sysctl_min_slab_ratio, 1534 .maxlen = sizeof(sysctl_min_slab_ratio), 1535 .mode = 0644, 1536 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1537 .extra1 = &zero, 1538 .extra2 = &one_hundred, 1539 }, 1540 #endif 1541 #ifdef CONFIG_SMP 1542 { 1543 .procname = "stat_interval", 1544 .data = &sysctl_stat_interval, 1545 .maxlen = sizeof(sysctl_stat_interval), 1546 .mode = 0644, 1547 .proc_handler = proc_dointvec_jiffies, 1548 }, 1549 { 1550 .procname = "stat_refresh", 1551 .data = NULL, 1552 .maxlen = 0, 1553 .mode = 0600, 1554 .proc_handler = vmstat_refresh, 1555 }, 1556 #endif 1557 #ifdef CONFIG_MMU 1558 { 1559 .procname = "mmap_min_addr", 1560 .data = &dac_mmap_min_addr, 1561 .maxlen = sizeof(unsigned long), 1562 .mode = 0644, 1563 .proc_handler = mmap_min_addr_handler, 1564 }, 1565 #endif 1566 #ifdef CONFIG_NUMA 1567 { 1568 .procname = "numa_zonelist_order", 1569 .data = &numa_zonelist_order, 1570 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1571 .mode = 0644, 1572 .proc_handler = numa_zonelist_order_handler, 1573 }, 1574 #endif 1575 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1576 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1577 { 1578 .procname = "vdso_enabled", 1579 #ifdef CONFIG_X86_32 1580 .data = &vdso32_enabled, 1581 .maxlen = sizeof(vdso32_enabled), 1582 #else 1583 .data = &vdso_enabled, 1584 .maxlen = sizeof(vdso_enabled), 1585 #endif 1586 .mode = 0644, 1587 .proc_handler = proc_dointvec, 1588 .extra1 = &zero, 1589 }, 1590 #endif 1591 #ifdef CONFIG_HIGHMEM 1592 { 1593 .procname = "highmem_is_dirtyable", 1594 .data = &vm_highmem_is_dirtyable, 1595 .maxlen = sizeof(vm_highmem_is_dirtyable), 1596 .mode = 0644, 1597 .proc_handler = proc_dointvec_minmax, 1598 .extra1 = &zero, 1599 .extra2 = &one, 1600 }, 1601 #endif 1602 #ifdef CONFIG_MEMORY_FAILURE 1603 { 1604 .procname = "memory_failure_early_kill", 1605 .data = &sysctl_memory_failure_early_kill, 1606 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1607 .mode = 0644, 1608 .proc_handler = proc_dointvec_minmax, 1609 .extra1 = &zero, 1610 .extra2 = &one, 1611 }, 1612 { 1613 .procname = "memory_failure_recovery", 1614 .data = &sysctl_memory_failure_recovery, 1615 .maxlen = sizeof(sysctl_memory_failure_recovery), 1616 .mode = 0644, 1617 .proc_handler = proc_dointvec_minmax, 1618 .extra1 = &zero, 1619 .extra2 = &one, 1620 }, 1621 #endif 1622 { 1623 .procname = "user_reserve_kbytes", 1624 .data = &sysctl_user_reserve_kbytes, 1625 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1626 .mode = 0644, 1627 .proc_handler = proc_doulongvec_minmax, 1628 }, 1629 { 1630 .procname = "admin_reserve_kbytes", 1631 .data = &sysctl_admin_reserve_kbytes, 1632 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1633 .mode = 0644, 1634 .proc_handler = proc_doulongvec_minmax, 1635 }, 1636 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1637 { 1638 .procname = "mmap_rnd_bits", 1639 .data = &mmap_rnd_bits, 1640 .maxlen = sizeof(mmap_rnd_bits), 1641 .mode = 0600, 1642 .proc_handler = proc_dointvec_minmax, 1643 .extra1 = (void *)&mmap_rnd_bits_min, 1644 .extra2 = (void *)&mmap_rnd_bits_max, 1645 }, 1646 #endif 1647 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1648 { 1649 .procname = "mmap_rnd_compat_bits", 1650 .data = &mmap_rnd_compat_bits, 1651 .maxlen = sizeof(mmap_rnd_compat_bits), 1652 .mode = 0600, 1653 .proc_handler = proc_dointvec_minmax, 1654 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1655 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1656 }, 1657 #endif 1658 { } 1659 }; 1660 1661 static struct ctl_table fs_table[] = { 1662 { 1663 .procname = "inode-nr", 1664 .data = &inodes_stat, 1665 .maxlen = 2*sizeof(long), 1666 .mode = 0444, 1667 .proc_handler = proc_nr_inodes, 1668 }, 1669 { 1670 .procname = "inode-state", 1671 .data = &inodes_stat, 1672 .maxlen = 7*sizeof(long), 1673 .mode = 0444, 1674 .proc_handler = proc_nr_inodes, 1675 }, 1676 { 1677 .procname = "file-nr", 1678 .data = &files_stat, 1679 .maxlen = sizeof(files_stat), 1680 .mode = 0444, 1681 .proc_handler = proc_nr_files, 1682 }, 1683 { 1684 .procname = "file-max", 1685 .data = &files_stat.max_files, 1686 .maxlen = sizeof(files_stat.max_files), 1687 .mode = 0644, 1688 .proc_handler = proc_doulongvec_minmax, 1689 }, 1690 { 1691 .procname = "nr_open", 1692 .data = &sysctl_nr_open, 1693 .maxlen = sizeof(unsigned int), 1694 .mode = 0644, 1695 .proc_handler = proc_dointvec_minmax, 1696 .extra1 = &sysctl_nr_open_min, 1697 .extra2 = &sysctl_nr_open_max, 1698 }, 1699 { 1700 .procname = "dentry-state", 1701 .data = &dentry_stat, 1702 .maxlen = 6*sizeof(long), 1703 .mode = 0444, 1704 .proc_handler = proc_nr_dentry, 1705 }, 1706 { 1707 .procname = "overflowuid", 1708 .data = &fs_overflowuid, 1709 .maxlen = sizeof(int), 1710 .mode = 0644, 1711 .proc_handler = proc_dointvec_minmax, 1712 .extra1 = &minolduid, 1713 .extra2 = &maxolduid, 1714 }, 1715 { 1716 .procname = "overflowgid", 1717 .data = &fs_overflowgid, 1718 .maxlen = sizeof(int), 1719 .mode = 0644, 1720 .proc_handler = proc_dointvec_minmax, 1721 .extra1 = &minolduid, 1722 .extra2 = &maxolduid, 1723 }, 1724 #ifdef CONFIG_FILE_LOCKING 1725 { 1726 .procname = "leases-enable", 1727 .data = &leases_enable, 1728 .maxlen = sizeof(int), 1729 .mode = 0644, 1730 .proc_handler = proc_dointvec, 1731 }, 1732 #endif 1733 #ifdef CONFIG_DNOTIFY 1734 { 1735 .procname = "dir-notify-enable", 1736 .data = &dir_notify_enable, 1737 .maxlen = sizeof(int), 1738 .mode = 0644, 1739 .proc_handler = proc_dointvec, 1740 }, 1741 #endif 1742 #ifdef CONFIG_MMU 1743 #ifdef CONFIG_FILE_LOCKING 1744 { 1745 .procname = "lease-break-time", 1746 .data = &lease_break_time, 1747 .maxlen = sizeof(int), 1748 .mode = 0644, 1749 .proc_handler = proc_dointvec, 1750 }, 1751 #endif 1752 #ifdef CONFIG_AIO 1753 { 1754 .procname = "aio-nr", 1755 .data = &aio_nr, 1756 .maxlen = sizeof(aio_nr), 1757 .mode = 0444, 1758 .proc_handler = proc_doulongvec_minmax, 1759 }, 1760 { 1761 .procname = "aio-max-nr", 1762 .data = &aio_max_nr, 1763 .maxlen = sizeof(aio_max_nr), 1764 .mode = 0644, 1765 .proc_handler = proc_doulongvec_minmax, 1766 }, 1767 #endif /* CONFIG_AIO */ 1768 #ifdef CONFIG_INOTIFY_USER 1769 { 1770 .procname = "inotify", 1771 .mode = 0555, 1772 .child = inotify_table, 1773 }, 1774 #endif 1775 #ifdef CONFIG_EPOLL 1776 { 1777 .procname = "epoll", 1778 .mode = 0555, 1779 .child = epoll_table, 1780 }, 1781 #endif 1782 #endif 1783 { 1784 .procname = "protected_symlinks", 1785 .data = &sysctl_protected_symlinks, 1786 .maxlen = sizeof(int), 1787 .mode = 0600, 1788 .proc_handler = proc_dointvec_minmax, 1789 .extra1 = &zero, 1790 .extra2 = &one, 1791 }, 1792 { 1793 .procname = "protected_hardlinks", 1794 .data = &sysctl_protected_hardlinks, 1795 .maxlen = sizeof(int), 1796 .mode = 0600, 1797 .proc_handler = proc_dointvec_minmax, 1798 .extra1 = &zero, 1799 .extra2 = &one, 1800 }, 1801 { 1802 .procname = "suid_dumpable", 1803 .data = &suid_dumpable, 1804 .maxlen = sizeof(int), 1805 .mode = 0644, 1806 .proc_handler = proc_dointvec_minmax_coredump, 1807 .extra1 = &zero, 1808 .extra2 = &two, 1809 }, 1810 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1811 { 1812 .procname = "binfmt_misc", 1813 .mode = 0555, 1814 .child = sysctl_mount_point, 1815 }, 1816 #endif 1817 { 1818 .procname = "pipe-max-size", 1819 .data = &pipe_max_size, 1820 .maxlen = sizeof(pipe_max_size), 1821 .mode = 0644, 1822 .proc_handler = &pipe_proc_fn, 1823 .extra1 = &pipe_min_size, 1824 }, 1825 { 1826 .procname = "pipe-user-pages-hard", 1827 .data = &pipe_user_pages_hard, 1828 .maxlen = sizeof(pipe_user_pages_hard), 1829 .mode = 0644, 1830 .proc_handler = proc_doulongvec_minmax, 1831 }, 1832 { 1833 .procname = "pipe-user-pages-soft", 1834 .data = &pipe_user_pages_soft, 1835 .maxlen = sizeof(pipe_user_pages_soft), 1836 .mode = 0644, 1837 .proc_handler = proc_doulongvec_minmax, 1838 }, 1839 { 1840 .procname = "mount-max", 1841 .data = &sysctl_mount_max, 1842 .maxlen = sizeof(unsigned int), 1843 .mode = 0644, 1844 .proc_handler = proc_dointvec_minmax, 1845 .extra1 = &one, 1846 }, 1847 { } 1848 }; 1849 1850 static struct ctl_table debug_table[] = { 1851 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1852 { 1853 .procname = "exception-trace", 1854 .data = &show_unhandled_signals, 1855 .maxlen = sizeof(int), 1856 .mode = 0644, 1857 .proc_handler = proc_dointvec 1858 }, 1859 #endif 1860 #if defined(CONFIG_OPTPROBES) 1861 { 1862 .procname = "kprobes-optimization", 1863 .data = &sysctl_kprobes_optimization, 1864 .maxlen = sizeof(int), 1865 .mode = 0644, 1866 .proc_handler = proc_kprobes_optimization_handler, 1867 .extra1 = &zero, 1868 .extra2 = &one, 1869 }, 1870 #endif 1871 { } 1872 }; 1873 1874 static struct ctl_table dev_table[] = { 1875 { } 1876 }; 1877 1878 int __init sysctl_init(void) 1879 { 1880 struct ctl_table_header *hdr; 1881 1882 hdr = register_sysctl_table(sysctl_base_table); 1883 kmemleak_not_leak(hdr); 1884 return 0; 1885 } 1886 1887 #endif /* CONFIG_SYSCTL */ 1888 1889 /* 1890 * /proc/sys support 1891 */ 1892 1893 #ifdef CONFIG_PROC_SYSCTL 1894 1895 static int _proc_do_string(char *data, int maxlen, int write, 1896 char __user *buffer, 1897 size_t *lenp, loff_t *ppos) 1898 { 1899 size_t len; 1900 char __user *p; 1901 char c; 1902 1903 if (!data || !maxlen || !*lenp) { 1904 *lenp = 0; 1905 return 0; 1906 } 1907 1908 if (write) { 1909 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1910 /* Only continue writes not past the end of buffer. */ 1911 len = strlen(data); 1912 if (len > maxlen - 1) 1913 len = maxlen - 1; 1914 1915 if (*ppos > len) 1916 return 0; 1917 len = *ppos; 1918 } else { 1919 /* Start writing from beginning of buffer. */ 1920 len = 0; 1921 } 1922 1923 *ppos += *lenp; 1924 p = buffer; 1925 while ((p - buffer) < *lenp && len < maxlen - 1) { 1926 if (get_user(c, p++)) 1927 return -EFAULT; 1928 if (c == 0 || c == '\n') 1929 break; 1930 data[len++] = c; 1931 } 1932 data[len] = 0; 1933 } else { 1934 len = strlen(data); 1935 if (len > maxlen) 1936 len = maxlen; 1937 1938 if (*ppos > len) { 1939 *lenp = 0; 1940 return 0; 1941 } 1942 1943 data += *ppos; 1944 len -= *ppos; 1945 1946 if (len > *lenp) 1947 len = *lenp; 1948 if (len) 1949 if (copy_to_user(buffer, data, len)) 1950 return -EFAULT; 1951 if (len < *lenp) { 1952 if (put_user('\n', buffer + len)) 1953 return -EFAULT; 1954 len++; 1955 } 1956 *lenp = len; 1957 *ppos += len; 1958 } 1959 return 0; 1960 } 1961 1962 static void warn_sysctl_write(struct ctl_table *table) 1963 { 1964 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1965 "This will not be supported in the future. To silence this\n" 1966 "warning, set kernel.sysctl_writes_strict = -1\n", 1967 current->comm, table->procname); 1968 } 1969 1970 /** 1971 * proc_first_pos_non_zero_ignore - check if firs position is allowed 1972 * @ppos: file position 1973 * @table: the sysctl table 1974 * 1975 * Returns true if the first position is non-zero and the sysctl_writes_strict 1976 * mode indicates this is not allowed for numeric input types. String proc 1977 * hadlers can ignore the return value. 1978 */ 1979 static bool proc_first_pos_non_zero_ignore(loff_t *ppos, 1980 struct ctl_table *table) 1981 { 1982 if (!*ppos) 1983 return false; 1984 1985 switch (sysctl_writes_strict) { 1986 case SYSCTL_WRITES_STRICT: 1987 return true; 1988 case SYSCTL_WRITES_WARN: 1989 warn_sysctl_write(table); 1990 return false; 1991 default: 1992 return false; 1993 } 1994 } 1995 1996 /** 1997 * proc_dostring - read a string sysctl 1998 * @table: the sysctl table 1999 * @write: %TRUE if this is a write to the sysctl file 2000 * @buffer: the user buffer 2001 * @lenp: the size of the user buffer 2002 * @ppos: file position 2003 * 2004 * Reads/writes a string from/to the user buffer. If the kernel 2005 * buffer provided is not large enough to hold the string, the 2006 * string is truncated. The copied string is %NULL-terminated. 2007 * If the string is being read by the user process, it is copied 2008 * and a newline '\n' is added. It is truncated if the buffer is 2009 * not large enough. 2010 * 2011 * Returns 0 on success. 2012 */ 2013 int proc_dostring(struct ctl_table *table, int write, 2014 void __user *buffer, size_t *lenp, loff_t *ppos) 2015 { 2016 if (write) 2017 proc_first_pos_non_zero_ignore(ppos, table); 2018 2019 return _proc_do_string((char *)(table->data), table->maxlen, write, 2020 (char __user *)buffer, lenp, ppos); 2021 } 2022 2023 static size_t proc_skip_spaces(char **buf) 2024 { 2025 size_t ret; 2026 char *tmp = skip_spaces(*buf); 2027 ret = tmp - *buf; 2028 *buf = tmp; 2029 return ret; 2030 } 2031 2032 static void proc_skip_char(char **buf, size_t *size, const char v) 2033 { 2034 while (*size) { 2035 if (**buf != v) 2036 break; 2037 (*size)--; 2038 (*buf)++; 2039 } 2040 } 2041 2042 #define TMPBUFLEN 22 2043 /** 2044 * proc_get_long - reads an ASCII formatted integer from a user buffer 2045 * 2046 * @buf: a kernel buffer 2047 * @size: size of the kernel buffer 2048 * @val: this is where the number will be stored 2049 * @neg: set to %TRUE if number is negative 2050 * @perm_tr: a vector which contains the allowed trailers 2051 * @perm_tr_len: size of the perm_tr vector 2052 * @tr: pointer to store the trailer character 2053 * 2054 * In case of success %0 is returned and @buf and @size are updated with 2055 * the amount of bytes read. If @tr is non-NULL and a trailing 2056 * character exists (size is non-zero after returning from this 2057 * function), @tr is updated with the trailing character. 2058 */ 2059 static int proc_get_long(char **buf, size_t *size, 2060 unsigned long *val, bool *neg, 2061 const char *perm_tr, unsigned perm_tr_len, char *tr) 2062 { 2063 int len; 2064 char *p, tmp[TMPBUFLEN]; 2065 2066 if (!*size) 2067 return -EINVAL; 2068 2069 len = *size; 2070 if (len > TMPBUFLEN - 1) 2071 len = TMPBUFLEN - 1; 2072 2073 memcpy(tmp, *buf, len); 2074 2075 tmp[len] = 0; 2076 p = tmp; 2077 if (*p == '-' && *size > 1) { 2078 *neg = true; 2079 p++; 2080 } else 2081 *neg = false; 2082 if (!isdigit(*p)) 2083 return -EINVAL; 2084 2085 *val = simple_strtoul(p, &p, 0); 2086 2087 len = p - tmp; 2088 2089 /* We don't know if the next char is whitespace thus we may accept 2090 * invalid integers (e.g. 1234...a) or two integers instead of one 2091 * (e.g. 123...1). So lets not allow such large numbers. */ 2092 if (len == TMPBUFLEN - 1) 2093 return -EINVAL; 2094 2095 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2096 return -EINVAL; 2097 2098 if (tr && (len < *size)) 2099 *tr = *p; 2100 2101 *buf += len; 2102 *size -= len; 2103 2104 return 0; 2105 } 2106 2107 /** 2108 * proc_put_long - converts an integer to a decimal ASCII formatted string 2109 * 2110 * @buf: the user buffer 2111 * @size: the size of the user buffer 2112 * @val: the integer to be converted 2113 * @neg: sign of the number, %TRUE for negative 2114 * 2115 * In case of success %0 is returned and @buf and @size are updated with 2116 * the amount of bytes written. 2117 */ 2118 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2119 bool neg) 2120 { 2121 int len; 2122 char tmp[TMPBUFLEN], *p = tmp; 2123 2124 sprintf(p, "%s%lu", neg ? "-" : "", val); 2125 len = strlen(tmp); 2126 if (len > *size) 2127 len = *size; 2128 if (copy_to_user(*buf, tmp, len)) 2129 return -EFAULT; 2130 *size -= len; 2131 *buf += len; 2132 return 0; 2133 } 2134 #undef TMPBUFLEN 2135 2136 static int proc_put_char(void __user **buf, size_t *size, char c) 2137 { 2138 if (*size) { 2139 char __user **buffer = (char __user **)buf; 2140 if (put_user(c, *buffer)) 2141 return -EFAULT; 2142 (*size)--, (*buffer)++; 2143 *buf = *buffer; 2144 } 2145 return 0; 2146 } 2147 2148 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2149 int *valp, 2150 int write, void *data) 2151 { 2152 if (write) { 2153 if (*negp) { 2154 if (*lvalp > (unsigned long) INT_MAX + 1) 2155 return -EINVAL; 2156 *valp = -*lvalp; 2157 } else { 2158 if (*lvalp > (unsigned long) INT_MAX) 2159 return -EINVAL; 2160 *valp = *lvalp; 2161 } 2162 } else { 2163 int val = *valp; 2164 if (val < 0) { 2165 *negp = true; 2166 *lvalp = -(unsigned long)val; 2167 } else { 2168 *negp = false; 2169 *lvalp = (unsigned long)val; 2170 } 2171 } 2172 return 0; 2173 } 2174 2175 static int do_proc_douintvec_conv(unsigned long *lvalp, 2176 unsigned int *valp, 2177 int write, void *data) 2178 { 2179 if (write) { 2180 if (*lvalp > UINT_MAX) 2181 return -EINVAL; 2182 *valp = *lvalp; 2183 } else { 2184 unsigned int val = *valp; 2185 *lvalp = (unsigned long)val; 2186 } 2187 return 0; 2188 } 2189 2190 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2191 2192 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2193 int write, void __user *buffer, 2194 size_t *lenp, loff_t *ppos, 2195 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2196 int write, void *data), 2197 void *data) 2198 { 2199 int *i, vleft, first = 1, err = 0; 2200 size_t left; 2201 char *kbuf = NULL, *p; 2202 2203 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2204 *lenp = 0; 2205 return 0; 2206 } 2207 2208 i = (int *) tbl_data; 2209 vleft = table->maxlen / sizeof(*i); 2210 left = *lenp; 2211 2212 if (!conv) 2213 conv = do_proc_dointvec_conv; 2214 2215 if (write) { 2216 if (proc_first_pos_non_zero_ignore(ppos, table)) 2217 goto out; 2218 2219 if (left > PAGE_SIZE - 1) 2220 left = PAGE_SIZE - 1; 2221 p = kbuf = memdup_user_nul(buffer, left); 2222 if (IS_ERR(kbuf)) 2223 return PTR_ERR(kbuf); 2224 } 2225 2226 for (; left && vleft--; i++, first=0) { 2227 unsigned long lval; 2228 bool neg; 2229 2230 if (write) { 2231 left -= proc_skip_spaces(&p); 2232 2233 if (!left) 2234 break; 2235 err = proc_get_long(&p, &left, &lval, &neg, 2236 proc_wspace_sep, 2237 sizeof(proc_wspace_sep), NULL); 2238 if (err) 2239 break; 2240 if (conv(&neg, &lval, i, 1, data)) { 2241 err = -EINVAL; 2242 break; 2243 } 2244 } else { 2245 if (conv(&neg, &lval, i, 0, data)) { 2246 err = -EINVAL; 2247 break; 2248 } 2249 if (!first) 2250 err = proc_put_char(&buffer, &left, '\t'); 2251 if (err) 2252 break; 2253 err = proc_put_long(&buffer, &left, lval, neg); 2254 if (err) 2255 break; 2256 } 2257 } 2258 2259 if (!write && !first && left && !err) 2260 err = proc_put_char(&buffer, &left, '\n'); 2261 if (write && !err && left) 2262 left -= proc_skip_spaces(&p); 2263 if (write) { 2264 kfree(kbuf); 2265 if (first) 2266 return err ? : -EINVAL; 2267 } 2268 *lenp -= left; 2269 out: 2270 *ppos += *lenp; 2271 return err; 2272 } 2273 2274 static int do_proc_dointvec(struct ctl_table *table, int write, 2275 void __user *buffer, size_t *lenp, loff_t *ppos, 2276 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2277 int write, void *data), 2278 void *data) 2279 { 2280 return __do_proc_dointvec(table->data, table, write, 2281 buffer, lenp, ppos, conv, data); 2282 } 2283 2284 static int do_proc_douintvec_w(unsigned int *tbl_data, 2285 struct ctl_table *table, 2286 void __user *buffer, 2287 size_t *lenp, loff_t *ppos, 2288 int (*conv)(unsigned long *lvalp, 2289 unsigned int *valp, 2290 int write, void *data), 2291 void *data) 2292 { 2293 unsigned long lval; 2294 int err = 0; 2295 size_t left; 2296 bool neg; 2297 char *kbuf = NULL, *p; 2298 2299 left = *lenp; 2300 2301 if (proc_first_pos_non_zero_ignore(ppos, table)) 2302 goto bail_early; 2303 2304 if (left > PAGE_SIZE - 1) 2305 left = PAGE_SIZE - 1; 2306 2307 p = kbuf = memdup_user_nul(buffer, left); 2308 if (IS_ERR(kbuf)) 2309 return -EINVAL; 2310 2311 left -= proc_skip_spaces(&p); 2312 if (!left) { 2313 err = -EINVAL; 2314 goto out_free; 2315 } 2316 2317 err = proc_get_long(&p, &left, &lval, &neg, 2318 proc_wspace_sep, 2319 sizeof(proc_wspace_sep), NULL); 2320 if (err || neg) { 2321 err = -EINVAL; 2322 goto out_free; 2323 } 2324 2325 if (conv(&lval, tbl_data, 1, data)) { 2326 err = -EINVAL; 2327 goto out_free; 2328 } 2329 2330 if (!err && left) 2331 left -= proc_skip_spaces(&p); 2332 2333 out_free: 2334 kfree(kbuf); 2335 if (err) 2336 return -EINVAL; 2337 2338 return 0; 2339 2340 /* This is in keeping with old __do_proc_dointvec() */ 2341 bail_early: 2342 *ppos += *lenp; 2343 return err; 2344 } 2345 2346 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, 2347 size_t *lenp, loff_t *ppos, 2348 int (*conv)(unsigned long *lvalp, 2349 unsigned int *valp, 2350 int write, void *data), 2351 void *data) 2352 { 2353 unsigned long lval; 2354 int err = 0; 2355 size_t left; 2356 2357 left = *lenp; 2358 2359 if (conv(&lval, tbl_data, 0, data)) { 2360 err = -EINVAL; 2361 goto out; 2362 } 2363 2364 err = proc_put_long(&buffer, &left, lval, false); 2365 if (err || !left) 2366 goto out; 2367 2368 err = proc_put_char(&buffer, &left, '\n'); 2369 2370 out: 2371 *lenp -= left; 2372 *ppos += *lenp; 2373 2374 return err; 2375 } 2376 2377 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, 2378 int write, void __user *buffer, 2379 size_t *lenp, loff_t *ppos, 2380 int (*conv)(unsigned long *lvalp, 2381 unsigned int *valp, 2382 int write, void *data), 2383 void *data) 2384 { 2385 unsigned int *i, vleft; 2386 2387 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2388 *lenp = 0; 2389 return 0; 2390 } 2391 2392 i = (unsigned int *) tbl_data; 2393 vleft = table->maxlen / sizeof(*i); 2394 2395 /* 2396 * Arrays are not supported, keep this simple. *Do not* add 2397 * support for them. 2398 */ 2399 if (vleft != 1) { 2400 *lenp = 0; 2401 return -EINVAL; 2402 } 2403 2404 if (!conv) 2405 conv = do_proc_douintvec_conv; 2406 2407 if (write) 2408 return do_proc_douintvec_w(i, table, buffer, lenp, ppos, 2409 conv, data); 2410 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); 2411 } 2412 2413 static int do_proc_douintvec(struct ctl_table *table, int write, 2414 void __user *buffer, size_t *lenp, loff_t *ppos, 2415 int (*conv)(unsigned long *lvalp, 2416 unsigned int *valp, 2417 int write, void *data), 2418 void *data) 2419 { 2420 return __do_proc_douintvec(table->data, table, write, 2421 buffer, lenp, ppos, conv, data); 2422 } 2423 2424 /** 2425 * proc_dointvec - read a vector of integers 2426 * @table: the sysctl table 2427 * @write: %TRUE if this is a write to the sysctl file 2428 * @buffer: the user buffer 2429 * @lenp: the size of the user buffer 2430 * @ppos: file position 2431 * 2432 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2433 * values from/to the user buffer, treated as an ASCII string. 2434 * 2435 * Returns 0 on success. 2436 */ 2437 int proc_dointvec(struct ctl_table *table, int write, 2438 void __user *buffer, size_t *lenp, loff_t *ppos) 2439 { 2440 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2441 } 2442 2443 /** 2444 * proc_douintvec - read a vector of unsigned integers 2445 * @table: the sysctl table 2446 * @write: %TRUE if this is a write to the sysctl file 2447 * @buffer: the user buffer 2448 * @lenp: the size of the user buffer 2449 * @ppos: file position 2450 * 2451 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2452 * values from/to the user buffer, treated as an ASCII string. 2453 * 2454 * Returns 0 on success. 2455 */ 2456 int proc_douintvec(struct ctl_table *table, int write, 2457 void __user *buffer, size_t *lenp, loff_t *ppos) 2458 { 2459 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2460 do_proc_douintvec_conv, NULL); 2461 } 2462 2463 /* 2464 * Taint values can only be increased 2465 * This means we can safely use a temporary. 2466 */ 2467 static int proc_taint(struct ctl_table *table, int write, 2468 void __user *buffer, size_t *lenp, loff_t *ppos) 2469 { 2470 struct ctl_table t; 2471 unsigned long tmptaint = get_taint(); 2472 int err; 2473 2474 if (write && !capable(CAP_SYS_ADMIN)) 2475 return -EPERM; 2476 2477 t = *table; 2478 t.data = &tmptaint; 2479 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2480 if (err < 0) 2481 return err; 2482 2483 if (write) { 2484 /* 2485 * Poor man's atomic or. Not worth adding a primitive 2486 * to everyone's atomic.h for this 2487 */ 2488 int i; 2489 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2490 if ((tmptaint >> i) & 1) 2491 add_taint(i, LOCKDEP_STILL_OK); 2492 } 2493 } 2494 2495 return err; 2496 } 2497 2498 #ifdef CONFIG_PRINTK 2499 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2500 void __user *buffer, size_t *lenp, loff_t *ppos) 2501 { 2502 if (write && !capable(CAP_SYS_ADMIN)) 2503 return -EPERM; 2504 2505 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2506 } 2507 #endif 2508 2509 struct do_proc_dointvec_minmax_conv_param { 2510 int *min; 2511 int *max; 2512 }; 2513 2514 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2515 int *valp, 2516 int write, void *data) 2517 { 2518 struct do_proc_dointvec_minmax_conv_param *param = data; 2519 if (write) { 2520 int val = *negp ? -*lvalp : *lvalp; 2521 if ((param->min && *param->min > val) || 2522 (param->max && *param->max < val)) 2523 return -EINVAL; 2524 *valp = val; 2525 } else { 2526 int val = *valp; 2527 if (val < 0) { 2528 *negp = true; 2529 *lvalp = -(unsigned long)val; 2530 } else { 2531 *negp = false; 2532 *lvalp = (unsigned long)val; 2533 } 2534 } 2535 return 0; 2536 } 2537 2538 /** 2539 * proc_dointvec_minmax - read a vector of integers with min/max values 2540 * @table: the sysctl table 2541 * @write: %TRUE if this is a write to the sysctl file 2542 * @buffer: the user buffer 2543 * @lenp: the size of the user buffer 2544 * @ppos: file position 2545 * 2546 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2547 * values from/to the user buffer, treated as an ASCII string. 2548 * 2549 * This routine will ensure the values are within the range specified by 2550 * table->extra1 (min) and table->extra2 (max). 2551 * 2552 * Returns 0 on success. 2553 */ 2554 int proc_dointvec_minmax(struct ctl_table *table, int write, 2555 void __user *buffer, size_t *lenp, loff_t *ppos) 2556 { 2557 struct do_proc_dointvec_minmax_conv_param param = { 2558 .min = (int *) table->extra1, 2559 .max = (int *) table->extra2, 2560 }; 2561 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2562 do_proc_dointvec_minmax_conv, ¶m); 2563 } 2564 2565 struct do_proc_douintvec_minmax_conv_param { 2566 unsigned int *min; 2567 unsigned int *max; 2568 }; 2569 2570 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, 2571 unsigned int *valp, 2572 int write, void *data) 2573 { 2574 struct do_proc_douintvec_minmax_conv_param *param = data; 2575 2576 if (write) { 2577 unsigned int val = *lvalp; 2578 2579 if (*lvalp > UINT_MAX) 2580 return -EINVAL; 2581 2582 if ((param->min && *param->min > val) || 2583 (param->max && *param->max < val)) 2584 return -ERANGE; 2585 2586 *valp = val; 2587 } else { 2588 unsigned int val = *valp; 2589 *lvalp = (unsigned long) val; 2590 } 2591 2592 return 0; 2593 } 2594 2595 /** 2596 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values 2597 * @table: the sysctl table 2598 * @write: %TRUE if this is a write to the sysctl file 2599 * @buffer: the user buffer 2600 * @lenp: the size of the user buffer 2601 * @ppos: file position 2602 * 2603 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2604 * values from/to the user buffer, treated as an ASCII string. Negative 2605 * strings are not allowed. 2606 * 2607 * This routine will ensure the values are within the range specified by 2608 * table->extra1 (min) and table->extra2 (max). There is a final sanity 2609 * check for UINT_MAX to avoid having to support wrap around uses from 2610 * userspace. 2611 * 2612 * Returns 0 on success. 2613 */ 2614 int proc_douintvec_minmax(struct ctl_table *table, int write, 2615 void __user *buffer, size_t *lenp, loff_t *ppos) 2616 { 2617 struct do_proc_douintvec_minmax_conv_param param = { 2618 .min = (unsigned int *) table->extra1, 2619 .max = (unsigned int *) table->extra2, 2620 }; 2621 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2622 do_proc_douintvec_minmax_conv, ¶m); 2623 } 2624 2625 struct do_proc_dopipe_max_size_conv_param { 2626 unsigned int *min; 2627 }; 2628 2629 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp, 2630 unsigned int *valp, 2631 int write, void *data) 2632 { 2633 struct do_proc_dopipe_max_size_conv_param *param = data; 2634 2635 if (write) { 2636 unsigned int val; 2637 2638 if (*lvalp > UINT_MAX) 2639 return -EINVAL; 2640 2641 val = round_pipe_size(*lvalp); 2642 if (val == 0) 2643 return -EINVAL; 2644 2645 if (param->min && *param->min > val) 2646 return -ERANGE; 2647 2648 *valp = val; 2649 } else { 2650 unsigned int val = *valp; 2651 *lvalp = (unsigned long) val; 2652 } 2653 2654 return 0; 2655 } 2656 2657 int proc_dopipe_max_size(struct ctl_table *table, int write, 2658 void __user *buffer, size_t *lenp, loff_t *ppos) 2659 { 2660 struct do_proc_dopipe_max_size_conv_param param = { 2661 .min = (unsigned int *) table->extra1, 2662 }; 2663 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2664 do_proc_dopipe_max_size_conv, ¶m); 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 = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 3043 GFP_KERNEL); 3044 if (!tmp_bitmap) { 3045 kfree(kbuf); 3046 return -ENOMEM; 3047 } 3048 proc_skip_char(&p, &left, '\n'); 3049 while (!err && left) { 3050 unsigned long val_a, val_b; 3051 bool neg; 3052 3053 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 3054 sizeof(tr_a), &c); 3055 if (err) 3056 break; 3057 if (val_a >= bitmap_len || neg) { 3058 err = -EINVAL; 3059 break; 3060 } 3061 3062 val_b = val_a; 3063 if (left) { 3064 p++; 3065 left--; 3066 } 3067 3068 if (c == '-') { 3069 err = proc_get_long(&p, &left, &val_b, 3070 &neg, tr_b, sizeof(tr_b), 3071 &c); 3072 if (err) 3073 break; 3074 if (val_b >= bitmap_len || neg || 3075 val_a > val_b) { 3076 err = -EINVAL; 3077 break; 3078 } 3079 if (left) { 3080 p++; 3081 left--; 3082 } 3083 } 3084 3085 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 3086 first = 0; 3087 proc_skip_char(&p, &left, '\n'); 3088 } 3089 kfree(kbuf); 3090 } else { 3091 unsigned long bit_a, bit_b = 0; 3092 3093 while (left) { 3094 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 3095 if (bit_a >= bitmap_len) 3096 break; 3097 bit_b = find_next_zero_bit(bitmap, bitmap_len, 3098 bit_a + 1) - 1; 3099 3100 if (!first) { 3101 err = proc_put_char(&buffer, &left, ','); 3102 if (err) 3103 break; 3104 } 3105 err = proc_put_long(&buffer, &left, bit_a, false); 3106 if (err) 3107 break; 3108 if (bit_a != bit_b) { 3109 err = proc_put_char(&buffer, &left, '-'); 3110 if (err) 3111 break; 3112 err = proc_put_long(&buffer, &left, bit_b, false); 3113 if (err) 3114 break; 3115 } 3116 3117 first = 0; bit_b++; 3118 } 3119 if (!err) 3120 err = proc_put_char(&buffer, &left, '\n'); 3121 } 3122 3123 if (!err) { 3124 if (write) { 3125 if (*ppos) 3126 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 3127 else 3128 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 3129 } 3130 *lenp -= left; 3131 *ppos += *lenp; 3132 } 3133 3134 kfree(tmp_bitmap); 3135 return err; 3136 } 3137 3138 #else /* CONFIG_PROC_SYSCTL */ 3139 3140 int proc_dostring(struct ctl_table *table, int write, 3141 void __user *buffer, size_t *lenp, loff_t *ppos) 3142 { 3143 return -ENOSYS; 3144 } 3145 3146 int proc_dointvec(struct ctl_table *table, int write, 3147 void __user *buffer, size_t *lenp, loff_t *ppos) 3148 { 3149 return -ENOSYS; 3150 } 3151 3152 int proc_douintvec(struct ctl_table *table, int write, 3153 void __user *buffer, size_t *lenp, loff_t *ppos) 3154 { 3155 return -ENOSYS; 3156 } 3157 3158 int proc_dointvec_minmax(struct ctl_table *table, int write, 3159 void __user *buffer, size_t *lenp, loff_t *ppos) 3160 { 3161 return -ENOSYS; 3162 } 3163 3164 int proc_douintvec_minmax(struct ctl_table *table, int write, 3165 void __user *buffer, size_t *lenp, loff_t *ppos) 3166 { 3167 return -ENOSYS; 3168 } 3169 3170 int proc_dopipe_max_size(struct ctl_table *table, int write, 3171 void __user *buffer, size_t *lenp, loff_t *ppos) 3172 { 3173 return -ENOSYS; 3174 } 3175 3176 int proc_dointvec_jiffies(struct ctl_table *table, int write, 3177 void __user *buffer, size_t *lenp, loff_t *ppos) 3178 { 3179 return -ENOSYS; 3180 } 3181 3182 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 3183 void __user *buffer, size_t *lenp, loff_t *ppos) 3184 { 3185 return -ENOSYS; 3186 } 3187 3188 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 3189 void __user *buffer, size_t *lenp, loff_t *ppos) 3190 { 3191 return -ENOSYS; 3192 } 3193 3194 int proc_doulongvec_minmax(struct ctl_table *table, int write, 3195 void __user *buffer, size_t *lenp, loff_t *ppos) 3196 { 3197 return -ENOSYS; 3198 } 3199 3200 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 3201 void __user *buffer, 3202 size_t *lenp, loff_t *ppos) 3203 { 3204 return -ENOSYS; 3205 } 3206 3207 3208 #endif /* CONFIG_PROC_SYSCTL */ 3209 3210 /* 3211 * No sense putting this after each symbol definition, twice, 3212 * exception granted :-) 3213 */ 3214 EXPORT_SYMBOL(proc_dointvec); 3215 EXPORT_SYMBOL(proc_douintvec); 3216 EXPORT_SYMBOL(proc_dointvec_jiffies); 3217 EXPORT_SYMBOL(proc_dointvec_minmax); 3218 EXPORT_SYMBOL_GPL(proc_douintvec_minmax); 3219 EXPORT_SYMBOL_GPL(proc_dopipe_max_size); 3220 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3221 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3222 EXPORT_SYMBOL(proc_dostring); 3223 EXPORT_SYMBOL(proc_doulongvec_minmax); 3224 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3225