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/config.h> 22 #include <linux/module.h> 23 #include <linux/mm.h> 24 #include <linux/swap.h> 25 #include <linux/slab.h> 26 #include <linux/sysctl.h> 27 #include <linux/proc_fs.h> 28 #include <linux/capability.h> 29 #include <linux/ctype.h> 30 #include <linux/utsname.h> 31 #include <linux/capability.h> 32 #include <linux/smp_lock.h> 33 #include <linux/init.h> 34 #include <linux/kernel.h> 35 #include <linux/kobject.h> 36 #include <linux/net.h> 37 #include <linux/sysrq.h> 38 #include <linux/highuid.h> 39 #include <linux/writeback.h> 40 #include <linux/hugetlb.h> 41 #include <linux/security.h> 42 #include <linux/initrd.h> 43 #include <linux/times.h> 44 #include <linux/limits.h> 45 #include <linux/dcache.h> 46 #include <linux/syscalls.h> 47 #include <linux/nfs_fs.h> 48 #include <linux/acpi.h> 49 50 #include <asm/uaccess.h> 51 #include <asm/processor.h> 52 53 extern int proc_nr_files(ctl_table *table, int write, struct file *filp, 54 void __user *buffer, size_t *lenp, loff_t *ppos); 55 56 #if defined(CONFIG_SYSCTL) 57 58 /* External variables not in a header file. */ 59 extern int C_A_D; 60 extern int sysctl_overcommit_memory; 61 extern int sysctl_overcommit_ratio; 62 extern int max_threads; 63 extern int sysrq_enabled; 64 extern int core_uses_pid; 65 extern int suid_dumpable; 66 extern char core_pattern[]; 67 extern int cad_pid; 68 extern int pid_max; 69 extern int min_free_kbytes; 70 extern int printk_ratelimit_jiffies; 71 extern int printk_ratelimit_burst; 72 extern int pid_max_min, pid_max_max; 73 extern int sysctl_drop_caches; 74 extern int percpu_pagelist_fraction; 75 76 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 77 int unknown_nmi_panic; 78 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *, 79 void __user *, size_t *, loff_t *); 80 #endif 81 82 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 83 static int maxolduid = 65535; 84 static int minolduid; 85 static int min_percpu_pagelist_fract = 8; 86 87 static int ngroups_max = NGROUPS_MAX; 88 89 #ifdef CONFIG_KMOD 90 extern char modprobe_path[]; 91 #endif 92 #ifdef CONFIG_CHR_DEV_SG 93 extern int sg_big_buff; 94 #endif 95 #ifdef CONFIG_SYSVIPC 96 extern size_t shm_ctlmax; 97 extern size_t shm_ctlall; 98 extern int shm_ctlmni; 99 extern int msg_ctlmax; 100 extern int msg_ctlmnb; 101 extern int msg_ctlmni; 102 extern int sem_ctls[]; 103 #endif 104 105 #ifdef __sparc__ 106 extern char reboot_command []; 107 extern int stop_a_enabled; 108 extern int scons_pwroff; 109 #endif 110 111 #ifdef __hppa__ 112 extern int pwrsw_enabled; 113 extern int unaligned_enabled; 114 #endif 115 116 #ifdef CONFIG_S390 117 #ifdef CONFIG_MATHEMU 118 extern int sysctl_ieee_emulation_warnings; 119 #endif 120 extern int sysctl_userprocess_debug; 121 extern int spin_retry; 122 #endif 123 124 extern int sysctl_hz_timer; 125 126 #ifdef CONFIG_BSD_PROCESS_ACCT 127 extern int acct_parm[]; 128 #endif 129 130 #ifdef CONFIG_IA64 131 extern int no_unaligned_warning; 132 #endif 133 134 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t, 135 ctl_table *, void **); 136 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 137 void __user *buffer, size_t *lenp, loff_t *ppos); 138 139 static ctl_table root_table[]; 140 static struct ctl_table_header root_table_header = 141 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; 142 143 static ctl_table kern_table[]; 144 static ctl_table vm_table[]; 145 static ctl_table proc_table[]; 146 static ctl_table fs_table[]; 147 static ctl_table debug_table[]; 148 static ctl_table dev_table[]; 149 extern ctl_table random_table[]; 150 #ifdef CONFIG_UNIX98_PTYS 151 extern ctl_table pty_table[]; 152 #endif 153 #ifdef CONFIG_INOTIFY 154 extern ctl_table inotify_table[]; 155 #endif 156 157 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 158 int sysctl_legacy_va_layout; 159 #endif 160 161 /* /proc declarations: */ 162 163 #ifdef CONFIG_PROC_FS 164 165 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *); 166 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *); 167 static int proc_opensys(struct inode *, struct file *); 168 169 struct file_operations proc_sys_file_operations = { 170 .open = proc_opensys, 171 .read = proc_readsys, 172 .write = proc_writesys, 173 }; 174 175 extern struct proc_dir_entry *proc_sys_root; 176 177 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *); 178 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *); 179 #endif 180 181 /* The default sysctl tables: */ 182 183 static ctl_table root_table[] = { 184 { 185 .ctl_name = CTL_KERN, 186 .procname = "kernel", 187 .mode = 0555, 188 .child = kern_table, 189 }, 190 { 191 .ctl_name = CTL_VM, 192 .procname = "vm", 193 .mode = 0555, 194 .child = vm_table, 195 }, 196 #ifdef CONFIG_NET 197 { 198 .ctl_name = CTL_NET, 199 .procname = "net", 200 .mode = 0555, 201 .child = net_table, 202 }, 203 #endif 204 { 205 .ctl_name = CTL_PROC, 206 .procname = "proc", 207 .mode = 0555, 208 .child = proc_table, 209 }, 210 { 211 .ctl_name = CTL_FS, 212 .procname = "fs", 213 .mode = 0555, 214 .child = fs_table, 215 }, 216 { 217 .ctl_name = CTL_DEBUG, 218 .procname = "debug", 219 .mode = 0555, 220 .child = debug_table, 221 }, 222 { 223 .ctl_name = CTL_DEV, 224 .procname = "dev", 225 .mode = 0555, 226 .child = dev_table, 227 }, 228 229 { .ctl_name = 0 } 230 }; 231 232 static ctl_table kern_table[] = { 233 { 234 .ctl_name = KERN_OSTYPE, 235 .procname = "ostype", 236 .data = system_utsname.sysname, 237 .maxlen = sizeof(system_utsname.sysname), 238 .mode = 0444, 239 .proc_handler = &proc_doutsstring, 240 .strategy = &sysctl_string, 241 }, 242 { 243 .ctl_name = KERN_OSRELEASE, 244 .procname = "osrelease", 245 .data = system_utsname.release, 246 .maxlen = sizeof(system_utsname.release), 247 .mode = 0444, 248 .proc_handler = &proc_doutsstring, 249 .strategy = &sysctl_string, 250 }, 251 { 252 .ctl_name = KERN_VERSION, 253 .procname = "version", 254 .data = system_utsname.version, 255 .maxlen = sizeof(system_utsname.version), 256 .mode = 0444, 257 .proc_handler = &proc_doutsstring, 258 .strategy = &sysctl_string, 259 }, 260 { 261 .ctl_name = KERN_NODENAME, 262 .procname = "hostname", 263 .data = system_utsname.nodename, 264 .maxlen = sizeof(system_utsname.nodename), 265 .mode = 0644, 266 .proc_handler = &proc_doutsstring, 267 .strategy = &sysctl_string, 268 }, 269 { 270 .ctl_name = KERN_DOMAINNAME, 271 .procname = "domainname", 272 .data = system_utsname.domainname, 273 .maxlen = sizeof(system_utsname.domainname), 274 .mode = 0644, 275 .proc_handler = &proc_doutsstring, 276 .strategy = &sysctl_string, 277 }, 278 { 279 .ctl_name = KERN_PANIC, 280 .procname = "panic", 281 .data = &panic_timeout, 282 .maxlen = sizeof(int), 283 .mode = 0644, 284 .proc_handler = &proc_dointvec, 285 }, 286 { 287 .ctl_name = KERN_CORE_USES_PID, 288 .procname = "core_uses_pid", 289 .data = &core_uses_pid, 290 .maxlen = sizeof(int), 291 .mode = 0644, 292 .proc_handler = &proc_dointvec, 293 }, 294 { 295 .ctl_name = KERN_CORE_PATTERN, 296 .procname = "core_pattern", 297 .data = core_pattern, 298 .maxlen = 64, 299 .mode = 0644, 300 .proc_handler = &proc_dostring, 301 .strategy = &sysctl_string, 302 }, 303 { 304 .ctl_name = KERN_TAINTED, 305 .procname = "tainted", 306 .data = &tainted, 307 .maxlen = sizeof(int), 308 .mode = 0444, 309 .proc_handler = &proc_dointvec, 310 }, 311 { 312 .ctl_name = KERN_CAP_BSET, 313 .procname = "cap-bound", 314 .data = &cap_bset, 315 .maxlen = sizeof(kernel_cap_t), 316 .mode = 0600, 317 .proc_handler = &proc_dointvec_bset, 318 }, 319 #ifdef CONFIG_BLK_DEV_INITRD 320 { 321 .ctl_name = KERN_REALROOTDEV, 322 .procname = "real-root-dev", 323 .data = &real_root_dev, 324 .maxlen = sizeof(int), 325 .mode = 0644, 326 .proc_handler = &proc_dointvec, 327 }, 328 #endif 329 #ifdef __sparc__ 330 { 331 .ctl_name = KERN_SPARC_REBOOT, 332 .procname = "reboot-cmd", 333 .data = reboot_command, 334 .maxlen = 256, 335 .mode = 0644, 336 .proc_handler = &proc_dostring, 337 .strategy = &sysctl_string, 338 }, 339 { 340 .ctl_name = KERN_SPARC_STOP_A, 341 .procname = "stop-a", 342 .data = &stop_a_enabled, 343 .maxlen = sizeof (int), 344 .mode = 0644, 345 .proc_handler = &proc_dointvec, 346 }, 347 { 348 .ctl_name = KERN_SPARC_SCONS_PWROFF, 349 .procname = "scons-poweroff", 350 .data = &scons_pwroff, 351 .maxlen = sizeof (int), 352 .mode = 0644, 353 .proc_handler = &proc_dointvec, 354 }, 355 #endif 356 #ifdef __hppa__ 357 { 358 .ctl_name = KERN_HPPA_PWRSW, 359 .procname = "soft-power", 360 .data = &pwrsw_enabled, 361 .maxlen = sizeof (int), 362 .mode = 0644, 363 .proc_handler = &proc_dointvec, 364 }, 365 { 366 .ctl_name = KERN_HPPA_UNALIGNED, 367 .procname = "unaligned-trap", 368 .data = &unaligned_enabled, 369 .maxlen = sizeof (int), 370 .mode = 0644, 371 .proc_handler = &proc_dointvec, 372 }, 373 #endif 374 { 375 .ctl_name = KERN_CTLALTDEL, 376 .procname = "ctrl-alt-del", 377 .data = &C_A_D, 378 .maxlen = sizeof(int), 379 .mode = 0644, 380 .proc_handler = &proc_dointvec, 381 }, 382 { 383 .ctl_name = KERN_PRINTK, 384 .procname = "printk", 385 .data = &console_loglevel, 386 .maxlen = 4*sizeof(int), 387 .mode = 0644, 388 .proc_handler = &proc_dointvec, 389 }, 390 #ifdef CONFIG_KMOD 391 { 392 .ctl_name = KERN_MODPROBE, 393 .procname = "modprobe", 394 .data = &modprobe_path, 395 .maxlen = KMOD_PATH_LEN, 396 .mode = 0644, 397 .proc_handler = &proc_dostring, 398 .strategy = &sysctl_string, 399 }, 400 #endif 401 #ifdef CONFIG_HOTPLUG 402 { 403 .ctl_name = KERN_HOTPLUG, 404 .procname = "hotplug", 405 .data = &uevent_helper, 406 .maxlen = UEVENT_HELPER_PATH_LEN, 407 .mode = 0644, 408 .proc_handler = &proc_dostring, 409 .strategy = &sysctl_string, 410 }, 411 #endif 412 #ifdef CONFIG_CHR_DEV_SG 413 { 414 .ctl_name = KERN_SG_BIG_BUFF, 415 .procname = "sg-big-buff", 416 .data = &sg_big_buff, 417 .maxlen = sizeof (int), 418 .mode = 0444, 419 .proc_handler = &proc_dointvec, 420 }, 421 #endif 422 #ifdef CONFIG_BSD_PROCESS_ACCT 423 { 424 .ctl_name = KERN_ACCT, 425 .procname = "acct", 426 .data = &acct_parm, 427 .maxlen = 3*sizeof(int), 428 .mode = 0644, 429 .proc_handler = &proc_dointvec, 430 }, 431 #endif 432 #ifdef CONFIG_SYSVIPC 433 { 434 .ctl_name = KERN_SHMMAX, 435 .procname = "shmmax", 436 .data = &shm_ctlmax, 437 .maxlen = sizeof (size_t), 438 .mode = 0644, 439 .proc_handler = &proc_doulongvec_minmax, 440 }, 441 { 442 .ctl_name = KERN_SHMALL, 443 .procname = "shmall", 444 .data = &shm_ctlall, 445 .maxlen = sizeof (size_t), 446 .mode = 0644, 447 .proc_handler = &proc_doulongvec_minmax, 448 }, 449 { 450 .ctl_name = KERN_SHMMNI, 451 .procname = "shmmni", 452 .data = &shm_ctlmni, 453 .maxlen = sizeof (int), 454 .mode = 0644, 455 .proc_handler = &proc_dointvec, 456 }, 457 { 458 .ctl_name = KERN_MSGMAX, 459 .procname = "msgmax", 460 .data = &msg_ctlmax, 461 .maxlen = sizeof (int), 462 .mode = 0644, 463 .proc_handler = &proc_dointvec, 464 }, 465 { 466 .ctl_name = KERN_MSGMNI, 467 .procname = "msgmni", 468 .data = &msg_ctlmni, 469 .maxlen = sizeof (int), 470 .mode = 0644, 471 .proc_handler = &proc_dointvec, 472 }, 473 { 474 .ctl_name = KERN_MSGMNB, 475 .procname = "msgmnb", 476 .data = &msg_ctlmnb, 477 .maxlen = sizeof (int), 478 .mode = 0644, 479 .proc_handler = &proc_dointvec, 480 }, 481 { 482 .ctl_name = KERN_SEM, 483 .procname = "sem", 484 .data = &sem_ctls, 485 .maxlen = 4*sizeof (int), 486 .mode = 0644, 487 .proc_handler = &proc_dointvec, 488 }, 489 #endif 490 #ifdef CONFIG_MAGIC_SYSRQ 491 { 492 .ctl_name = KERN_SYSRQ, 493 .procname = "sysrq", 494 .data = &sysrq_enabled, 495 .maxlen = sizeof (int), 496 .mode = 0644, 497 .proc_handler = &proc_dointvec, 498 }, 499 #endif 500 { 501 .ctl_name = KERN_CADPID, 502 .procname = "cad_pid", 503 .data = &cad_pid, 504 .maxlen = sizeof (int), 505 .mode = 0600, 506 .proc_handler = &proc_dointvec, 507 }, 508 { 509 .ctl_name = KERN_MAX_THREADS, 510 .procname = "threads-max", 511 .data = &max_threads, 512 .maxlen = sizeof(int), 513 .mode = 0644, 514 .proc_handler = &proc_dointvec, 515 }, 516 { 517 .ctl_name = KERN_RANDOM, 518 .procname = "random", 519 .mode = 0555, 520 .child = random_table, 521 }, 522 #ifdef CONFIG_UNIX98_PTYS 523 { 524 .ctl_name = KERN_PTY, 525 .procname = "pty", 526 .mode = 0555, 527 .child = pty_table, 528 }, 529 #endif 530 { 531 .ctl_name = KERN_OVERFLOWUID, 532 .procname = "overflowuid", 533 .data = &overflowuid, 534 .maxlen = sizeof(int), 535 .mode = 0644, 536 .proc_handler = &proc_dointvec_minmax, 537 .strategy = &sysctl_intvec, 538 .extra1 = &minolduid, 539 .extra2 = &maxolduid, 540 }, 541 { 542 .ctl_name = KERN_OVERFLOWGID, 543 .procname = "overflowgid", 544 .data = &overflowgid, 545 .maxlen = sizeof(int), 546 .mode = 0644, 547 .proc_handler = &proc_dointvec_minmax, 548 .strategy = &sysctl_intvec, 549 .extra1 = &minolduid, 550 .extra2 = &maxolduid, 551 }, 552 #ifdef CONFIG_S390 553 #ifdef CONFIG_MATHEMU 554 { 555 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 556 .procname = "ieee_emulation_warnings", 557 .data = &sysctl_ieee_emulation_warnings, 558 .maxlen = sizeof(int), 559 .mode = 0644, 560 .proc_handler = &proc_dointvec, 561 }, 562 #endif 563 #ifdef CONFIG_NO_IDLE_HZ 564 { 565 .ctl_name = KERN_HZ_TIMER, 566 .procname = "hz_timer", 567 .data = &sysctl_hz_timer, 568 .maxlen = sizeof(int), 569 .mode = 0644, 570 .proc_handler = &proc_dointvec, 571 }, 572 #endif 573 { 574 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 575 .procname = "userprocess_debug", 576 .data = &sysctl_userprocess_debug, 577 .maxlen = sizeof(int), 578 .mode = 0644, 579 .proc_handler = &proc_dointvec, 580 }, 581 #endif 582 { 583 .ctl_name = KERN_PIDMAX, 584 .procname = "pid_max", 585 .data = &pid_max, 586 .maxlen = sizeof (int), 587 .mode = 0644, 588 .proc_handler = &proc_dointvec_minmax, 589 .strategy = sysctl_intvec, 590 .extra1 = &pid_max_min, 591 .extra2 = &pid_max_max, 592 }, 593 { 594 .ctl_name = KERN_PANIC_ON_OOPS, 595 .procname = "panic_on_oops", 596 .data = &panic_on_oops, 597 .maxlen = sizeof(int), 598 .mode = 0644, 599 .proc_handler = &proc_dointvec, 600 }, 601 { 602 .ctl_name = KERN_PRINTK_RATELIMIT, 603 .procname = "printk_ratelimit", 604 .data = &printk_ratelimit_jiffies, 605 .maxlen = sizeof(int), 606 .mode = 0644, 607 .proc_handler = &proc_dointvec_jiffies, 608 .strategy = &sysctl_jiffies, 609 }, 610 { 611 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 612 .procname = "printk_ratelimit_burst", 613 .data = &printk_ratelimit_burst, 614 .maxlen = sizeof(int), 615 .mode = 0644, 616 .proc_handler = &proc_dointvec, 617 }, 618 { 619 .ctl_name = KERN_NGROUPS_MAX, 620 .procname = "ngroups_max", 621 .data = &ngroups_max, 622 .maxlen = sizeof (int), 623 .mode = 0444, 624 .proc_handler = &proc_dointvec, 625 }, 626 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 627 { 628 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 629 .procname = "unknown_nmi_panic", 630 .data = &unknown_nmi_panic, 631 .maxlen = sizeof (int), 632 .mode = 0644, 633 .proc_handler = &proc_unknown_nmi_panic, 634 }, 635 #endif 636 #if defined(CONFIG_X86) 637 { 638 .ctl_name = KERN_BOOTLOADER_TYPE, 639 .procname = "bootloader_type", 640 .data = &bootloader_type, 641 .maxlen = sizeof (int), 642 .mode = 0444, 643 .proc_handler = &proc_dointvec, 644 }, 645 #endif 646 #if defined(CONFIG_MMU) 647 { 648 .ctl_name = KERN_RANDOMIZE, 649 .procname = "randomize_va_space", 650 .data = &randomize_va_space, 651 .maxlen = sizeof(int), 652 .mode = 0644, 653 .proc_handler = &proc_dointvec, 654 }, 655 #endif 656 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 657 { 658 .ctl_name = KERN_SPIN_RETRY, 659 .procname = "spin_retry", 660 .data = &spin_retry, 661 .maxlen = sizeof (int), 662 .mode = 0644, 663 .proc_handler = &proc_dointvec, 664 }, 665 #endif 666 #ifdef CONFIG_ACPI_SLEEP 667 { 668 .ctl_name = KERN_ACPI_VIDEO_FLAGS, 669 .procname = "acpi_video_flags", 670 .data = &acpi_video_flags, 671 .maxlen = sizeof (unsigned long), 672 .mode = 0644, 673 .proc_handler = &proc_doulongvec_minmax, 674 }, 675 #endif 676 #ifdef CONFIG_IA64 677 { 678 .ctl_name = KERN_IA64_UNALIGNED, 679 .procname = "ignore-unaligned-usertrap", 680 .data = &no_unaligned_warning, 681 .maxlen = sizeof (int), 682 .mode = 0644, 683 .proc_handler = &proc_dointvec, 684 }, 685 #endif 686 { .ctl_name = 0 } 687 }; 688 689 /* Constants for minimum and maximum testing in vm_table. 690 We use these as one-element integer vectors. */ 691 static int zero; 692 static int one_hundred = 100; 693 694 695 static ctl_table vm_table[] = { 696 { 697 .ctl_name = VM_OVERCOMMIT_MEMORY, 698 .procname = "overcommit_memory", 699 .data = &sysctl_overcommit_memory, 700 .maxlen = sizeof(sysctl_overcommit_memory), 701 .mode = 0644, 702 .proc_handler = &proc_dointvec, 703 }, 704 { 705 .ctl_name = VM_OVERCOMMIT_RATIO, 706 .procname = "overcommit_ratio", 707 .data = &sysctl_overcommit_ratio, 708 .maxlen = sizeof(sysctl_overcommit_ratio), 709 .mode = 0644, 710 .proc_handler = &proc_dointvec, 711 }, 712 { 713 .ctl_name = VM_PAGE_CLUSTER, 714 .procname = "page-cluster", 715 .data = &page_cluster, 716 .maxlen = sizeof(int), 717 .mode = 0644, 718 .proc_handler = &proc_dointvec, 719 }, 720 { 721 .ctl_name = VM_DIRTY_BACKGROUND, 722 .procname = "dirty_background_ratio", 723 .data = &dirty_background_ratio, 724 .maxlen = sizeof(dirty_background_ratio), 725 .mode = 0644, 726 .proc_handler = &proc_dointvec_minmax, 727 .strategy = &sysctl_intvec, 728 .extra1 = &zero, 729 .extra2 = &one_hundred, 730 }, 731 { 732 .ctl_name = VM_DIRTY_RATIO, 733 .procname = "dirty_ratio", 734 .data = &vm_dirty_ratio, 735 .maxlen = sizeof(vm_dirty_ratio), 736 .mode = 0644, 737 .proc_handler = &proc_dointvec_minmax, 738 .strategy = &sysctl_intvec, 739 .extra1 = &zero, 740 .extra2 = &one_hundred, 741 }, 742 { 743 .ctl_name = VM_DIRTY_WB_CS, 744 .procname = "dirty_writeback_centisecs", 745 .data = &dirty_writeback_centisecs, 746 .maxlen = sizeof(dirty_writeback_centisecs), 747 .mode = 0644, 748 .proc_handler = &dirty_writeback_centisecs_handler, 749 }, 750 { 751 .ctl_name = VM_DIRTY_EXPIRE_CS, 752 .procname = "dirty_expire_centisecs", 753 .data = &dirty_expire_centisecs, 754 .maxlen = sizeof(dirty_expire_centisecs), 755 .mode = 0644, 756 .proc_handler = &proc_dointvec, 757 }, 758 { 759 .ctl_name = VM_NR_PDFLUSH_THREADS, 760 .procname = "nr_pdflush_threads", 761 .data = &nr_pdflush_threads, 762 .maxlen = sizeof nr_pdflush_threads, 763 .mode = 0444 /* read-only*/, 764 .proc_handler = &proc_dointvec, 765 }, 766 { 767 .ctl_name = VM_SWAPPINESS, 768 .procname = "swappiness", 769 .data = &vm_swappiness, 770 .maxlen = sizeof(vm_swappiness), 771 .mode = 0644, 772 .proc_handler = &proc_dointvec_minmax, 773 .strategy = &sysctl_intvec, 774 .extra1 = &zero, 775 .extra2 = &one_hundred, 776 }, 777 #ifdef CONFIG_HUGETLB_PAGE 778 { 779 .ctl_name = VM_HUGETLB_PAGES, 780 .procname = "nr_hugepages", 781 .data = &max_huge_pages, 782 .maxlen = sizeof(unsigned long), 783 .mode = 0644, 784 .proc_handler = &hugetlb_sysctl_handler, 785 .extra1 = (void *)&hugetlb_zero, 786 .extra2 = (void *)&hugetlb_infinity, 787 }, 788 { 789 .ctl_name = VM_HUGETLB_GROUP, 790 .procname = "hugetlb_shm_group", 791 .data = &sysctl_hugetlb_shm_group, 792 .maxlen = sizeof(gid_t), 793 .mode = 0644, 794 .proc_handler = &proc_dointvec, 795 }, 796 #endif 797 { 798 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 799 .procname = "lowmem_reserve_ratio", 800 .data = &sysctl_lowmem_reserve_ratio, 801 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 802 .mode = 0644, 803 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 804 .strategy = &sysctl_intvec, 805 }, 806 { 807 .ctl_name = VM_DROP_PAGECACHE, 808 .procname = "drop_caches", 809 .data = &sysctl_drop_caches, 810 .maxlen = sizeof(int), 811 .mode = 0644, 812 .proc_handler = drop_caches_sysctl_handler, 813 .strategy = &sysctl_intvec, 814 }, 815 { 816 .ctl_name = VM_MIN_FREE_KBYTES, 817 .procname = "min_free_kbytes", 818 .data = &min_free_kbytes, 819 .maxlen = sizeof(min_free_kbytes), 820 .mode = 0644, 821 .proc_handler = &min_free_kbytes_sysctl_handler, 822 .strategy = &sysctl_intvec, 823 .extra1 = &zero, 824 }, 825 { 826 .ctl_name = VM_PERCPU_PAGELIST_FRACTION, 827 .procname = "percpu_pagelist_fraction", 828 .data = &percpu_pagelist_fraction, 829 .maxlen = sizeof(percpu_pagelist_fraction), 830 .mode = 0644, 831 .proc_handler = &percpu_pagelist_fraction_sysctl_handler, 832 .strategy = &sysctl_intvec, 833 .extra1 = &min_percpu_pagelist_fract, 834 }, 835 #ifdef CONFIG_MMU 836 { 837 .ctl_name = VM_MAX_MAP_COUNT, 838 .procname = "max_map_count", 839 .data = &sysctl_max_map_count, 840 .maxlen = sizeof(sysctl_max_map_count), 841 .mode = 0644, 842 .proc_handler = &proc_dointvec 843 }, 844 #endif 845 { 846 .ctl_name = VM_LAPTOP_MODE, 847 .procname = "laptop_mode", 848 .data = &laptop_mode, 849 .maxlen = sizeof(laptop_mode), 850 .mode = 0644, 851 .proc_handler = &proc_dointvec, 852 .strategy = &sysctl_intvec, 853 .extra1 = &zero, 854 }, 855 { 856 .ctl_name = VM_BLOCK_DUMP, 857 .procname = "block_dump", 858 .data = &block_dump, 859 .maxlen = sizeof(block_dump), 860 .mode = 0644, 861 .proc_handler = &proc_dointvec, 862 .strategy = &sysctl_intvec, 863 .extra1 = &zero, 864 }, 865 { 866 .ctl_name = VM_VFS_CACHE_PRESSURE, 867 .procname = "vfs_cache_pressure", 868 .data = &sysctl_vfs_cache_pressure, 869 .maxlen = sizeof(sysctl_vfs_cache_pressure), 870 .mode = 0644, 871 .proc_handler = &proc_dointvec, 872 .strategy = &sysctl_intvec, 873 .extra1 = &zero, 874 }, 875 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 876 { 877 .ctl_name = VM_LEGACY_VA_LAYOUT, 878 .procname = "legacy_va_layout", 879 .data = &sysctl_legacy_va_layout, 880 .maxlen = sizeof(sysctl_legacy_va_layout), 881 .mode = 0644, 882 .proc_handler = &proc_dointvec, 883 .strategy = &sysctl_intvec, 884 .extra1 = &zero, 885 }, 886 #endif 887 #ifdef CONFIG_SWAP 888 { 889 .ctl_name = VM_SWAP_TOKEN_TIMEOUT, 890 .procname = "swap_token_timeout", 891 .data = &swap_token_default_timeout, 892 .maxlen = sizeof(swap_token_default_timeout), 893 .mode = 0644, 894 .proc_handler = &proc_dointvec_jiffies, 895 .strategy = &sysctl_jiffies, 896 }, 897 #endif 898 #ifdef CONFIG_NUMA 899 { 900 .ctl_name = VM_ZONE_RECLAIM_MODE, 901 .procname = "zone_reclaim_mode", 902 .data = &zone_reclaim_mode, 903 .maxlen = sizeof(zone_reclaim_mode), 904 .mode = 0644, 905 .proc_handler = &proc_dointvec, 906 .strategy = &sysctl_intvec, 907 .extra1 = &zero, 908 }, 909 { 910 .ctl_name = VM_ZONE_RECLAIM_INTERVAL, 911 .procname = "zone_reclaim_interval", 912 .data = &zone_reclaim_interval, 913 .maxlen = sizeof(zone_reclaim_interval), 914 .mode = 0644, 915 .proc_handler = &proc_dointvec_jiffies, 916 .strategy = &sysctl_jiffies, 917 }, 918 #endif 919 { .ctl_name = 0 } 920 }; 921 922 static ctl_table proc_table[] = { 923 { .ctl_name = 0 } 924 }; 925 926 static ctl_table fs_table[] = { 927 { 928 .ctl_name = FS_NRINODE, 929 .procname = "inode-nr", 930 .data = &inodes_stat, 931 .maxlen = 2*sizeof(int), 932 .mode = 0444, 933 .proc_handler = &proc_dointvec, 934 }, 935 { 936 .ctl_name = FS_STATINODE, 937 .procname = "inode-state", 938 .data = &inodes_stat, 939 .maxlen = 7*sizeof(int), 940 .mode = 0444, 941 .proc_handler = &proc_dointvec, 942 }, 943 { 944 .ctl_name = FS_NRFILE, 945 .procname = "file-nr", 946 .data = &files_stat, 947 .maxlen = 3*sizeof(int), 948 .mode = 0444, 949 .proc_handler = &proc_nr_files, 950 }, 951 { 952 .ctl_name = FS_MAXFILE, 953 .procname = "file-max", 954 .data = &files_stat.max_files, 955 .maxlen = sizeof(int), 956 .mode = 0644, 957 .proc_handler = &proc_dointvec, 958 }, 959 { 960 .ctl_name = FS_DENTRY, 961 .procname = "dentry-state", 962 .data = &dentry_stat, 963 .maxlen = 6*sizeof(int), 964 .mode = 0444, 965 .proc_handler = &proc_dointvec, 966 }, 967 { 968 .ctl_name = FS_OVERFLOWUID, 969 .procname = "overflowuid", 970 .data = &fs_overflowuid, 971 .maxlen = sizeof(int), 972 .mode = 0644, 973 .proc_handler = &proc_dointvec_minmax, 974 .strategy = &sysctl_intvec, 975 .extra1 = &minolduid, 976 .extra2 = &maxolduid, 977 }, 978 { 979 .ctl_name = FS_OVERFLOWGID, 980 .procname = "overflowgid", 981 .data = &fs_overflowgid, 982 .maxlen = sizeof(int), 983 .mode = 0644, 984 .proc_handler = &proc_dointvec_minmax, 985 .strategy = &sysctl_intvec, 986 .extra1 = &minolduid, 987 .extra2 = &maxolduid, 988 }, 989 { 990 .ctl_name = FS_LEASES, 991 .procname = "leases-enable", 992 .data = &leases_enable, 993 .maxlen = sizeof(int), 994 .mode = 0644, 995 .proc_handler = &proc_dointvec, 996 }, 997 #ifdef CONFIG_DNOTIFY 998 { 999 .ctl_name = FS_DIR_NOTIFY, 1000 .procname = "dir-notify-enable", 1001 .data = &dir_notify_enable, 1002 .maxlen = sizeof(int), 1003 .mode = 0644, 1004 .proc_handler = &proc_dointvec, 1005 }, 1006 #endif 1007 #ifdef CONFIG_MMU 1008 { 1009 .ctl_name = FS_LEASE_TIME, 1010 .procname = "lease-break-time", 1011 .data = &lease_break_time, 1012 .maxlen = sizeof(int), 1013 .mode = 0644, 1014 .proc_handler = &proc_dointvec, 1015 }, 1016 { 1017 .ctl_name = FS_AIO_NR, 1018 .procname = "aio-nr", 1019 .data = &aio_nr, 1020 .maxlen = sizeof(aio_nr), 1021 .mode = 0444, 1022 .proc_handler = &proc_doulongvec_minmax, 1023 }, 1024 { 1025 .ctl_name = FS_AIO_MAX_NR, 1026 .procname = "aio-max-nr", 1027 .data = &aio_max_nr, 1028 .maxlen = sizeof(aio_max_nr), 1029 .mode = 0644, 1030 .proc_handler = &proc_doulongvec_minmax, 1031 }, 1032 #ifdef CONFIG_INOTIFY 1033 { 1034 .ctl_name = FS_INOTIFY, 1035 .procname = "inotify", 1036 .mode = 0555, 1037 .child = inotify_table, 1038 }, 1039 #endif 1040 #endif 1041 { 1042 .ctl_name = KERN_SETUID_DUMPABLE, 1043 .procname = "suid_dumpable", 1044 .data = &suid_dumpable, 1045 .maxlen = sizeof(int), 1046 .mode = 0644, 1047 .proc_handler = &proc_dointvec, 1048 }, 1049 { .ctl_name = 0 } 1050 }; 1051 1052 static ctl_table debug_table[] = { 1053 { .ctl_name = 0 } 1054 }; 1055 1056 static ctl_table dev_table[] = { 1057 { .ctl_name = 0 } 1058 }; 1059 1060 extern void init_irq_proc (void); 1061 1062 static DEFINE_SPINLOCK(sysctl_lock); 1063 1064 /* called under sysctl_lock */ 1065 static int use_table(struct ctl_table_header *p) 1066 { 1067 if (unlikely(p->unregistering)) 1068 return 0; 1069 p->used++; 1070 return 1; 1071 } 1072 1073 /* called under sysctl_lock */ 1074 static void unuse_table(struct ctl_table_header *p) 1075 { 1076 if (!--p->used) 1077 if (unlikely(p->unregistering)) 1078 complete(p->unregistering); 1079 } 1080 1081 /* called under sysctl_lock, will reacquire if has to wait */ 1082 static void start_unregistering(struct ctl_table_header *p) 1083 { 1084 /* 1085 * if p->used is 0, nobody will ever touch that entry again; 1086 * we'll eliminate all paths to it before dropping sysctl_lock 1087 */ 1088 if (unlikely(p->used)) { 1089 struct completion wait; 1090 init_completion(&wait); 1091 p->unregistering = &wait; 1092 spin_unlock(&sysctl_lock); 1093 wait_for_completion(&wait); 1094 spin_lock(&sysctl_lock); 1095 } 1096 /* 1097 * do not remove from the list until nobody holds it; walking the 1098 * list in do_sysctl() relies on that. 1099 */ 1100 list_del_init(&p->ctl_entry); 1101 } 1102 1103 void __init sysctl_init(void) 1104 { 1105 #ifdef CONFIG_PROC_FS 1106 register_proc_table(root_table, proc_sys_root, &root_table_header); 1107 init_irq_proc(); 1108 #endif 1109 } 1110 1111 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1112 void __user *newval, size_t newlen) 1113 { 1114 struct list_head *tmp; 1115 int error = -ENOTDIR; 1116 1117 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1118 return -ENOTDIR; 1119 if (oldval) { 1120 int old_len; 1121 if (!oldlenp || get_user(old_len, oldlenp)) 1122 return -EFAULT; 1123 } 1124 spin_lock(&sysctl_lock); 1125 tmp = &root_table_header.ctl_entry; 1126 do { 1127 struct ctl_table_header *head = 1128 list_entry(tmp, struct ctl_table_header, ctl_entry); 1129 void *context = NULL; 1130 1131 if (!use_table(head)) 1132 continue; 1133 1134 spin_unlock(&sysctl_lock); 1135 1136 error = parse_table(name, nlen, oldval, oldlenp, 1137 newval, newlen, head->ctl_table, 1138 &context); 1139 kfree(context); 1140 1141 spin_lock(&sysctl_lock); 1142 unuse_table(head); 1143 if (error != -ENOTDIR) 1144 break; 1145 } while ((tmp = tmp->next) != &root_table_header.ctl_entry); 1146 spin_unlock(&sysctl_lock); 1147 return error; 1148 } 1149 1150 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 1151 { 1152 struct __sysctl_args tmp; 1153 int error; 1154 1155 if (copy_from_user(&tmp, args, sizeof(tmp))) 1156 return -EFAULT; 1157 1158 lock_kernel(); 1159 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1160 tmp.newval, tmp.newlen); 1161 unlock_kernel(); 1162 return error; 1163 } 1164 1165 /* 1166 * ctl_perm does NOT grant the superuser all rights automatically, because 1167 * some sysctl variables are readonly even to root. 1168 */ 1169 1170 static int test_perm(int mode, int op) 1171 { 1172 if (!current->euid) 1173 mode >>= 6; 1174 else if (in_egroup_p(0)) 1175 mode >>= 3; 1176 if ((mode & op & 0007) == op) 1177 return 0; 1178 return -EACCES; 1179 } 1180 1181 static inline int ctl_perm(ctl_table *table, int op) 1182 { 1183 int error; 1184 error = security_sysctl(table, op); 1185 if (error) 1186 return error; 1187 return test_perm(table->mode, op); 1188 } 1189 1190 static int parse_table(int __user *name, int nlen, 1191 void __user *oldval, size_t __user *oldlenp, 1192 void __user *newval, size_t newlen, 1193 ctl_table *table, void **context) 1194 { 1195 int n; 1196 repeat: 1197 if (!nlen) 1198 return -ENOTDIR; 1199 if (get_user(n, name)) 1200 return -EFAULT; 1201 for ( ; table->ctl_name; table++) { 1202 if (n == table->ctl_name || table->ctl_name == CTL_ANY) { 1203 int error; 1204 if (table->child) { 1205 if (ctl_perm(table, 001)) 1206 return -EPERM; 1207 if (table->strategy) { 1208 error = table->strategy( 1209 table, name, nlen, 1210 oldval, oldlenp, 1211 newval, newlen, context); 1212 if (error) 1213 return error; 1214 } 1215 name++; 1216 nlen--; 1217 table = table->child; 1218 goto repeat; 1219 } 1220 error = do_sysctl_strategy(table, name, nlen, 1221 oldval, oldlenp, 1222 newval, newlen, context); 1223 return error; 1224 } 1225 } 1226 return -ENOTDIR; 1227 } 1228 1229 /* Perform the actual read/write of a sysctl table entry. */ 1230 int do_sysctl_strategy (ctl_table *table, 1231 int __user *name, int nlen, 1232 void __user *oldval, size_t __user *oldlenp, 1233 void __user *newval, size_t newlen, void **context) 1234 { 1235 int op = 0, rc; 1236 size_t len; 1237 1238 if (oldval) 1239 op |= 004; 1240 if (newval) 1241 op |= 002; 1242 if (ctl_perm(table, op)) 1243 return -EPERM; 1244 1245 if (table->strategy) { 1246 rc = table->strategy(table, name, nlen, oldval, oldlenp, 1247 newval, newlen, context); 1248 if (rc < 0) 1249 return rc; 1250 if (rc > 0) 1251 return 0; 1252 } 1253 1254 /* If there is no strategy routine, or if the strategy returns 1255 * zero, proceed with automatic r/w */ 1256 if (table->data && table->maxlen) { 1257 if (oldval && oldlenp) { 1258 if (get_user(len, oldlenp)) 1259 return -EFAULT; 1260 if (len) { 1261 if (len > table->maxlen) 1262 len = table->maxlen; 1263 if(copy_to_user(oldval, table->data, len)) 1264 return -EFAULT; 1265 if(put_user(len, oldlenp)) 1266 return -EFAULT; 1267 } 1268 } 1269 if (newval && newlen) { 1270 len = newlen; 1271 if (len > table->maxlen) 1272 len = table->maxlen; 1273 if(copy_from_user(table->data, newval, len)) 1274 return -EFAULT; 1275 } 1276 } 1277 return 0; 1278 } 1279 1280 /** 1281 * register_sysctl_table - register a sysctl hierarchy 1282 * @table: the top-level table structure 1283 * @insert_at_head: whether the entry should be inserted in front or at the end 1284 * 1285 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1286 * array. An entry with a ctl_name of 0 terminates the table. 1287 * 1288 * The members of the &ctl_table structure are used as follows: 1289 * 1290 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1291 * must be unique within that level of sysctl 1292 * 1293 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1294 * enter a sysctl file 1295 * 1296 * data - a pointer to data for use by proc_handler 1297 * 1298 * maxlen - the maximum size in bytes of the data 1299 * 1300 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1301 * 1302 * child - a pointer to the child sysctl table if this entry is a directory, or 1303 * %NULL. 1304 * 1305 * proc_handler - the text handler routine (described below) 1306 * 1307 * strategy - the strategy routine (described below) 1308 * 1309 * de - for internal use by the sysctl routines 1310 * 1311 * extra1, extra2 - extra pointers usable by the proc handler routines 1312 * 1313 * Leaf nodes in the sysctl tree will be represented by a single file 1314 * under /proc; non-leaf nodes will be represented by directories. 1315 * 1316 * sysctl(2) can automatically manage read and write requests through 1317 * the sysctl table. The data and maxlen fields of the ctl_table 1318 * struct enable minimal validation of the values being written to be 1319 * performed, and the mode field allows minimal authentication. 1320 * 1321 * More sophisticated management can be enabled by the provision of a 1322 * strategy routine with the table entry. This will be called before 1323 * any automatic read or write of the data is performed. 1324 * 1325 * The strategy routine may return 1326 * 1327 * < 0 - Error occurred (error is passed to user process) 1328 * 1329 * 0 - OK - proceed with automatic read or write. 1330 * 1331 * > 0 - OK - read or write has been done by the strategy routine, so 1332 * return immediately. 1333 * 1334 * There must be a proc_handler routine for any terminal nodes 1335 * mirrored under /proc/sys (non-terminals are handled by a built-in 1336 * directory handler). Several default handlers are available to 1337 * cover common cases - 1338 * 1339 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1340 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1341 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1342 * 1343 * It is the handler's job to read the input buffer from user memory 1344 * and process it. The handler should return 0 on success. 1345 * 1346 * This routine returns %NULL on a failure to register, and a pointer 1347 * to the table header on success. 1348 */ 1349 struct ctl_table_header *register_sysctl_table(ctl_table * table, 1350 int insert_at_head) 1351 { 1352 struct ctl_table_header *tmp; 1353 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); 1354 if (!tmp) 1355 return NULL; 1356 tmp->ctl_table = table; 1357 INIT_LIST_HEAD(&tmp->ctl_entry); 1358 tmp->used = 0; 1359 tmp->unregistering = NULL; 1360 spin_lock(&sysctl_lock); 1361 if (insert_at_head) 1362 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); 1363 else 1364 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); 1365 spin_unlock(&sysctl_lock); 1366 #ifdef CONFIG_PROC_FS 1367 register_proc_table(table, proc_sys_root, tmp); 1368 #endif 1369 return tmp; 1370 } 1371 1372 /** 1373 * unregister_sysctl_table - unregister a sysctl table hierarchy 1374 * @header: the header returned from register_sysctl_table 1375 * 1376 * Unregisters the sysctl table and all children. proc entries may not 1377 * actually be removed until they are no longer used by anyone. 1378 */ 1379 void unregister_sysctl_table(struct ctl_table_header * header) 1380 { 1381 might_sleep(); 1382 spin_lock(&sysctl_lock); 1383 start_unregistering(header); 1384 #ifdef CONFIG_PROC_FS 1385 unregister_proc_table(header->ctl_table, proc_sys_root); 1386 #endif 1387 spin_unlock(&sysctl_lock); 1388 kfree(header); 1389 } 1390 1391 /* 1392 * /proc/sys support 1393 */ 1394 1395 #ifdef CONFIG_PROC_FS 1396 1397 /* Scan the sysctl entries in table and add them all into /proc */ 1398 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set) 1399 { 1400 struct proc_dir_entry *de; 1401 int len; 1402 mode_t mode; 1403 1404 for (; table->ctl_name; table++) { 1405 /* Can't do anything without a proc name. */ 1406 if (!table->procname) 1407 continue; 1408 /* Maybe we can't do anything with it... */ 1409 if (!table->proc_handler && !table->child) { 1410 printk(KERN_WARNING "SYSCTL: Can't register %s\n", 1411 table->procname); 1412 continue; 1413 } 1414 1415 len = strlen(table->procname); 1416 mode = table->mode; 1417 1418 de = NULL; 1419 if (table->proc_handler) 1420 mode |= S_IFREG; 1421 else { 1422 mode |= S_IFDIR; 1423 for (de = root->subdir; de; de = de->next) { 1424 if (proc_match(len, table->procname, de)) 1425 break; 1426 } 1427 /* If the subdir exists already, de is non-NULL */ 1428 } 1429 1430 if (!de) { 1431 de = create_proc_entry(table->procname, mode, root); 1432 if (!de) 1433 continue; 1434 de->set = set; 1435 de->data = (void *) table; 1436 if (table->proc_handler) 1437 de->proc_fops = &proc_sys_file_operations; 1438 } 1439 table->de = de; 1440 if (de->mode & S_IFDIR) 1441 register_proc_table(table->child, de, set); 1442 } 1443 } 1444 1445 /* 1446 * Unregister a /proc sysctl table and any subdirectories. 1447 */ 1448 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) 1449 { 1450 struct proc_dir_entry *de; 1451 for (; table->ctl_name; table++) { 1452 if (!(de = table->de)) 1453 continue; 1454 if (de->mode & S_IFDIR) { 1455 if (!table->child) { 1456 printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); 1457 continue; 1458 } 1459 unregister_proc_table(table->child, de); 1460 1461 /* Don't unregister directories which still have entries.. */ 1462 if (de->subdir) 1463 continue; 1464 } 1465 1466 /* 1467 * In any case, mark the entry as goner; we'll keep it 1468 * around if it's busy, but we'll know to do nothing with 1469 * its fields. We are under sysctl_lock here. 1470 */ 1471 de->data = NULL; 1472 1473 /* Don't unregister proc entries that are still being used.. */ 1474 if (atomic_read(&de->count)) 1475 continue; 1476 1477 table->de = NULL; 1478 remove_proc_entry(table->procname, root); 1479 } 1480 } 1481 1482 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf, 1483 size_t count, loff_t *ppos) 1484 { 1485 int op; 1486 struct proc_dir_entry *de = PDE(file->f_dentry->d_inode); 1487 struct ctl_table *table; 1488 size_t res; 1489 ssize_t error = -ENOTDIR; 1490 1491 spin_lock(&sysctl_lock); 1492 if (de && de->data && use_table(de->set)) { 1493 /* 1494 * at that point we know that sysctl was not unregistered 1495 * and won't be until we finish 1496 */ 1497 spin_unlock(&sysctl_lock); 1498 table = (struct ctl_table *) de->data; 1499 if (!table || !table->proc_handler) 1500 goto out; 1501 error = -EPERM; 1502 op = (write ? 002 : 004); 1503 if (ctl_perm(table, op)) 1504 goto out; 1505 1506 /* careful: calling conventions are nasty here */ 1507 res = count; 1508 error = (*table->proc_handler)(table, write, file, 1509 buf, &res, ppos); 1510 if (!error) 1511 error = res; 1512 out: 1513 spin_lock(&sysctl_lock); 1514 unuse_table(de->set); 1515 } 1516 spin_unlock(&sysctl_lock); 1517 return error; 1518 } 1519 1520 static int proc_opensys(struct inode *inode, struct file *file) 1521 { 1522 if (file->f_mode & FMODE_WRITE) { 1523 /* 1524 * sysctl entries that are not writable, 1525 * are _NOT_ writable, capabilities or not. 1526 */ 1527 if (!(inode->i_mode & S_IWUSR)) 1528 return -EPERM; 1529 } 1530 1531 return 0; 1532 } 1533 1534 static ssize_t proc_readsys(struct file * file, char __user * buf, 1535 size_t count, loff_t *ppos) 1536 { 1537 return do_rw_proc(0, file, buf, count, ppos); 1538 } 1539 1540 static ssize_t proc_writesys(struct file * file, const char __user * buf, 1541 size_t count, loff_t *ppos) 1542 { 1543 return do_rw_proc(1, file, (char __user *) buf, count, ppos); 1544 } 1545 1546 /** 1547 * proc_dostring - read a string sysctl 1548 * @table: the sysctl table 1549 * @write: %TRUE if this is a write to the sysctl file 1550 * @filp: the file structure 1551 * @buffer: the user buffer 1552 * @lenp: the size of the user buffer 1553 * @ppos: file position 1554 * 1555 * Reads/writes a string from/to the user buffer. If the kernel 1556 * buffer provided is not large enough to hold the string, the 1557 * string is truncated. The copied string is %NULL-terminated. 1558 * If the string is being read by the user process, it is copied 1559 * and a newline '\n' is added. It is truncated if the buffer is 1560 * not large enough. 1561 * 1562 * Returns 0 on success. 1563 */ 1564 int proc_dostring(ctl_table *table, int write, struct file *filp, 1565 void __user *buffer, size_t *lenp, loff_t *ppos) 1566 { 1567 size_t len; 1568 char __user *p; 1569 char c; 1570 1571 if (!table->data || !table->maxlen || !*lenp || 1572 (*ppos && !write)) { 1573 *lenp = 0; 1574 return 0; 1575 } 1576 1577 if (write) { 1578 len = 0; 1579 p = buffer; 1580 while (len < *lenp) { 1581 if (get_user(c, p++)) 1582 return -EFAULT; 1583 if (c == 0 || c == '\n') 1584 break; 1585 len++; 1586 } 1587 if (len >= table->maxlen) 1588 len = table->maxlen-1; 1589 if(copy_from_user(table->data, buffer, len)) 1590 return -EFAULT; 1591 ((char *) table->data)[len] = 0; 1592 *ppos += *lenp; 1593 } else { 1594 len = strlen(table->data); 1595 if (len > table->maxlen) 1596 len = table->maxlen; 1597 if (len > *lenp) 1598 len = *lenp; 1599 if (len) 1600 if(copy_to_user(buffer, table->data, len)) 1601 return -EFAULT; 1602 if (len < *lenp) { 1603 if(put_user('\n', ((char __user *) buffer) + len)) 1604 return -EFAULT; 1605 len++; 1606 } 1607 *lenp = len; 1608 *ppos += len; 1609 } 1610 return 0; 1611 } 1612 1613 /* 1614 * Special case of dostring for the UTS structure. This has locks 1615 * to observe. Should this be in kernel/sys.c ???? 1616 */ 1617 1618 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 1619 void __user *buffer, size_t *lenp, loff_t *ppos) 1620 { 1621 int r; 1622 1623 if (!write) { 1624 down_read(&uts_sem); 1625 r=proc_dostring(table,0,filp,buffer,lenp, ppos); 1626 up_read(&uts_sem); 1627 } else { 1628 down_write(&uts_sem); 1629 r=proc_dostring(table,1,filp,buffer,lenp, ppos); 1630 up_write(&uts_sem); 1631 } 1632 return r; 1633 } 1634 1635 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 1636 int *valp, 1637 int write, void *data) 1638 { 1639 if (write) { 1640 *valp = *negp ? -*lvalp : *lvalp; 1641 } else { 1642 int val = *valp; 1643 if (val < 0) { 1644 *negp = -1; 1645 *lvalp = (unsigned long)-val; 1646 } else { 1647 *negp = 0; 1648 *lvalp = (unsigned long)val; 1649 } 1650 } 1651 return 0; 1652 } 1653 1654 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, 1655 void __user *buffer, size_t *lenp, loff_t *ppos, 1656 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 1657 int write, void *data), 1658 void *data) 1659 { 1660 #define TMPBUFLEN 21 1661 int *i, vleft, first=1, neg, val; 1662 unsigned long lval; 1663 size_t left, len; 1664 1665 char buf[TMPBUFLEN], *p; 1666 char __user *s = buffer; 1667 1668 if (!table->data || !table->maxlen || !*lenp || 1669 (*ppos && !write)) { 1670 *lenp = 0; 1671 return 0; 1672 } 1673 1674 i = (int *) table->data; 1675 vleft = table->maxlen / sizeof(*i); 1676 left = *lenp; 1677 1678 if (!conv) 1679 conv = do_proc_dointvec_conv; 1680 1681 for (; left && vleft--; i++, first=0) { 1682 if (write) { 1683 while (left) { 1684 char c; 1685 if (get_user(c, s)) 1686 return -EFAULT; 1687 if (!isspace(c)) 1688 break; 1689 left--; 1690 s++; 1691 } 1692 if (!left) 1693 break; 1694 neg = 0; 1695 len = left; 1696 if (len > sizeof(buf) - 1) 1697 len = sizeof(buf) - 1; 1698 if (copy_from_user(buf, s, len)) 1699 return -EFAULT; 1700 buf[len] = 0; 1701 p = buf; 1702 if (*p == '-' && left > 1) { 1703 neg = 1; 1704 left--, p++; 1705 } 1706 if (*p < '0' || *p > '9') 1707 break; 1708 1709 lval = simple_strtoul(p, &p, 0); 1710 1711 len = p-buf; 1712 if ((len < left) && *p && !isspace(*p)) 1713 break; 1714 if (neg) 1715 val = -val; 1716 s += len; 1717 left -= len; 1718 1719 if (conv(&neg, &lval, i, 1, data)) 1720 break; 1721 } else { 1722 p = buf; 1723 if (!first) 1724 *p++ = '\t'; 1725 1726 if (conv(&neg, &lval, i, 0, data)) 1727 break; 1728 1729 sprintf(p, "%s%lu", neg ? "-" : "", lval); 1730 len = strlen(buf); 1731 if (len > left) 1732 len = left; 1733 if(copy_to_user(s, buf, len)) 1734 return -EFAULT; 1735 left -= len; 1736 s += len; 1737 } 1738 } 1739 1740 if (!write && !first && left) { 1741 if(put_user('\n', s)) 1742 return -EFAULT; 1743 left--, s++; 1744 } 1745 if (write) { 1746 while (left) { 1747 char c; 1748 if (get_user(c, s++)) 1749 return -EFAULT; 1750 if (!isspace(c)) 1751 break; 1752 left--; 1753 } 1754 } 1755 if (write && first) 1756 return -EINVAL; 1757 *lenp -= left; 1758 *ppos += *lenp; 1759 return 0; 1760 #undef TMPBUFLEN 1761 } 1762 1763 /** 1764 * proc_dointvec - read a vector of integers 1765 * @table: the sysctl table 1766 * @write: %TRUE if this is a write to the sysctl file 1767 * @filp: the file structure 1768 * @buffer: the user buffer 1769 * @lenp: the size of the user buffer 1770 * @ppos: file position 1771 * 1772 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1773 * values from/to the user buffer, treated as an ASCII string. 1774 * 1775 * Returns 0 on success. 1776 */ 1777 int proc_dointvec(ctl_table *table, int write, struct file *filp, 1778 void __user *buffer, size_t *lenp, loff_t *ppos) 1779 { 1780 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 1781 NULL,NULL); 1782 } 1783 1784 #define OP_SET 0 1785 #define OP_AND 1 1786 #define OP_OR 2 1787 #define OP_MAX 3 1788 #define OP_MIN 4 1789 1790 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, 1791 int *valp, 1792 int write, void *data) 1793 { 1794 int op = *(int *)data; 1795 if (write) { 1796 int val = *negp ? -*lvalp : *lvalp; 1797 switch(op) { 1798 case OP_SET: *valp = val; break; 1799 case OP_AND: *valp &= val; break; 1800 case OP_OR: *valp |= val; break; 1801 case OP_MAX: if(*valp < val) 1802 *valp = val; 1803 break; 1804 case OP_MIN: if(*valp > val) 1805 *valp = val; 1806 break; 1807 } 1808 } else { 1809 int val = *valp; 1810 if (val < 0) { 1811 *negp = -1; 1812 *lvalp = (unsigned long)-val; 1813 } else { 1814 *negp = 0; 1815 *lvalp = (unsigned long)val; 1816 } 1817 } 1818 return 0; 1819 } 1820 1821 /* 1822 * init may raise the set. 1823 */ 1824 1825 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 1826 void __user *buffer, size_t *lenp, loff_t *ppos) 1827 { 1828 int op; 1829 1830 if (!capable(CAP_SYS_MODULE)) { 1831 return -EPERM; 1832 } 1833 1834 op = (current->pid == 1) ? OP_SET : OP_AND; 1835 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 1836 do_proc_dointvec_bset_conv,&op); 1837 } 1838 1839 struct do_proc_dointvec_minmax_conv_param { 1840 int *min; 1841 int *max; 1842 }; 1843 1844 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 1845 int *valp, 1846 int write, void *data) 1847 { 1848 struct do_proc_dointvec_minmax_conv_param *param = data; 1849 if (write) { 1850 int val = *negp ? -*lvalp : *lvalp; 1851 if ((param->min && *param->min > val) || 1852 (param->max && *param->max < val)) 1853 return -EINVAL; 1854 *valp = val; 1855 } else { 1856 int val = *valp; 1857 if (val < 0) { 1858 *negp = -1; 1859 *lvalp = (unsigned long)-val; 1860 } else { 1861 *negp = 0; 1862 *lvalp = (unsigned long)val; 1863 } 1864 } 1865 return 0; 1866 } 1867 1868 /** 1869 * proc_dointvec_minmax - read a vector of integers with min/max values 1870 * @table: the sysctl table 1871 * @write: %TRUE if this is a write to the sysctl file 1872 * @filp: the file structure 1873 * @buffer: the user buffer 1874 * @lenp: the size of the user buffer 1875 * @ppos: file position 1876 * 1877 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1878 * values from/to the user buffer, treated as an ASCII string. 1879 * 1880 * This routine will ensure the values are within the range specified by 1881 * table->extra1 (min) and table->extra2 (max). 1882 * 1883 * Returns 0 on success. 1884 */ 1885 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 1886 void __user *buffer, size_t *lenp, loff_t *ppos) 1887 { 1888 struct do_proc_dointvec_minmax_conv_param param = { 1889 .min = (int *) table->extra1, 1890 .max = (int *) table->extra2, 1891 }; 1892 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 1893 do_proc_dointvec_minmax_conv, ¶m); 1894 } 1895 1896 static int do_proc_doulongvec_minmax(ctl_table *table, int write, 1897 struct file *filp, 1898 void __user *buffer, 1899 size_t *lenp, loff_t *ppos, 1900 unsigned long convmul, 1901 unsigned long convdiv) 1902 { 1903 #define TMPBUFLEN 21 1904 unsigned long *i, *min, *max, val; 1905 int vleft, first=1, neg; 1906 size_t len, left; 1907 char buf[TMPBUFLEN], *p; 1908 char __user *s = buffer; 1909 1910 if (!table->data || !table->maxlen || !*lenp || 1911 (*ppos && !write)) { 1912 *lenp = 0; 1913 return 0; 1914 } 1915 1916 i = (unsigned long *) table->data; 1917 min = (unsigned long *) table->extra1; 1918 max = (unsigned long *) table->extra2; 1919 vleft = table->maxlen / sizeof(unsigned long); 1920 left = *lenp; 1921 1922 for (; left && vleft--; i++, min++, max++, first=0) { 1923 if (write) { 1924 while (left) { 1925 char c; 1926 if (get_user(c, s)) 1927 return -EFAULT; 1928 if (!isspace(c)) 1929 break; 1930 left--; 1931 s++; 1932 } 1933 if (!left) 1934 break; 1935 neg = 0; 1936 len = left; 1937 if (len > TMPBUFLEN-1) 1938 len = TMPBUFLEN-1; 1939 if (copy_from_user(buf, s, len)) 1940 return -EFAULT; 1941 buf[len] = 0; 1942 p = buf; 1943 if (*p == '-' && left > 1) { 1944 neg = 1; 1945 left--, p++; 1946 } 1947 if (*p < '0' || *p > '9') 1948 break; 1949 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 1950 len = p-buf; 1951 if ((len < left) && *p && !isspace(*p)) 1952 break; 1953 if (neg) 1954 val = -val; 1955 s += len; 1956 left -= len; 1957 1958 if(neg) 1959 continue; 1960 if ((min && val < *min) || (max && val > *max)) 1961 continue; 1962 *i = val; 1963 } else { 1964 p = buf; 1965 if (!first) 1966 *p++ = '\t'; 1967 sprintf(p, "%lu", convdiv * (*i) / convmul); 1968 len = strlen(buf); 1969 if (len > left) 1970 len = left; 1971 if(copy_to_user(s, buf, len)) 1972 return -EFAULT; 1973 left -= len; 1974 s += len; 1975 } 1976 } 1977 1978 if (!write && !first && left) { 1979 if(put_user('\n', s)) 1980 return -EFAULT; 1981 left--, s++; 1982 } 1983 if (write) { 1984 while (left) { 1985 char c; 1986 if (get_user(c, s++)) 1987 return -EFAULT; 1988 if (!isspace(c)) 1989 break; 1990 left--; 1991 } 1992 } 1993 if (write && first) 1994 return -EINVAL; 1995 *lenp -= left; 1996 *ppos += *lenp; 1997 return 0; 1998 #undef TMPBUFLEN 1999 } 2000 2001 /** 2002 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2003 * @table: the sysctl table 2004 * @write: %TRUE if this is a write to the sysctl file 2005 * @filp: the file structure 2006 * @buffer: the user buffer 2007 * @lenp: the size of the user buffer 2008 * @ppos: file position 2009 * 2010 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2011 * values from/to the user buffer, treated as an ASCII string. 2012 * 2013 * This routine will ensure the values are within the range specified by 2014 * table->extra1 (min) and table->extra2 (max). 2015 * 2016 * Returns 0 on success. 2017 */ 2018 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2019 void __user *buffer, size_t *lenp, loff_t *ppos) 2020 { 2021 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 2022 } 2023 2024 /** 2025 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2026 * @table: the sysctl table 2027 * @write: %TRUE if this is a write to the sysctl file 2028 * @filp: the file structure 2029 * @buffer: the user buffer 2030 * @lenp: the size of the user buffer 2031 * @ppos: file position 2032 * 2033 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2034 * values from/to the user buffer, treated as an ASCII string. The values 2035 * are treated as milliseconds, and converted to jiffies when they are stored. 2036 * 2037 * This routine will ensure the values are within the range specified by 2038 * table->extra1 (min) and table->extra2 (max). 2039 * 2040 * Returns 0 on success. 2041 */ 2042 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2043 struct file *filp, 2044 void __user *buffer, 2045 size_t *lenp, loff_t *ppos) 2046 { 2047 return do_proc_doulongvec_minmax(table, write, filp, buffer, 2048 lenp, ppos, HZ, 1000l); 2049 } 2050 2051 2052 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2053 int *valp, 2054 int write, void *data) 2055 { 2056 if (write) { 2057 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2058 } else { 2059 int val = *valp; 2060 unsigned long lval; 2061 if (val < 0) { 2062 *negp = -1; 2063 lval = (unsigned long)-val; 2064 } else { 2065 *negp = 0; 2066 lval = (unsigned long)val; 2067 } 2068 *lvalp = lval / HZ; 2069 } 2070 return 0; 2071 } 2072 2073 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2074 int *valp, 2075 int write, void *data) 2076 { 2077 if (write) { 2078 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2079 } else { 2080 int val = *valp; 2081 unsigned long lval; 2082 if (val < 0) { 2083 *negp = -1; 2084 lval = (unsigned long)-val; 2085 } else { 2086 *negp = 0; 2087 lval = (unsigned long)val; 2088 } 2089 *lvalp = jiffies_to_clock_t(lval); 2090 } 2091 return 0; 2092 } 2093 2094 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2095 int *valp, 2096 int write, void *data) 2097 { 2098 if (write) { 2099 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2100 } else { 2101 int val = *valp; 2102 unsigned long lval; 2103 if (val < 0) { 2104 *negp = -1; 2105 lval = (unsigned long)-val; 2106 } else { 2107 *negp = 0; 2108 lval = (unsigned long)val; 2109 } 2110 *lvalp = jiffies_to_msecs(lval); 2111 } 2112 return 0; 2113 } 2114 2115 /** 2116 * proc_dointvec_jiffies - read a vector of integers as seconds 2117 * @table: the sysctl table 2118 * @write: %TRUE if this is a write to the sysctl file 2119 * @filp: the file structure 2120 * @buffer: the user buffer 2121 * @lenp: the size of the user buffer 2122 * @ppos: file position 2123 * 2124 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2125 * values from/to the user buffer, treated as an ASCII string. 2126 * The values read are assumed to be in seconds, and are converted into 2127 * jiffies. 2128 * 2129 * Returns 0 on success. 2130 */ 2131 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2132 void __user *buffer, size_t *lenp, loff_t *ppos) 2133 { 2134 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2135 do_proc_dointvec_jiffies_conv,NULL); 2136 } 2137 2138 /** 2139 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2140 * @table: the sysctl table 2141 * @write: %TRUE if this is a write to the sysctl file 2142 * @filp: the file structure 2143 * @buffer: the user buffer 2144 * @lenp: the size of the user buffer 2145 * @ppos: pointer to the file position 2146 * 2147 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2148 * values from/to the user buffer, treated as an ASCII string. 2149 * The values read are assumed to be in 1/USER_HZ seconds, and 2150 * are converted into jiffies. 2151 * 2152 * Returns 0 on success. 2153 */ 2154 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2155 void __user *buffer, size_t *lenp, loff_t *ppos) 2156 { 2157 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2158 do_proc_dointvec_userhz_jiffies_conv,NULL); 2159 } 2160 2161 /** 2162 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2163 * @table: the sysctl table 2164 * @write: %TRUE if this is a write to the sysctl file 2165 * @filp: the file structure 2166 * @buffer: the user buffer 2167 * @lenp: the size of the user buffer 2168 * @ppos: file position 2169 * @ppos: the current position in the file 2170 * 2171 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2172 * values from/to the user buffer, treated as an ASCII string. 2173 * The values read are assumed to be in 1/1000 seconds, and 2174 * are converted into jiffies. 2175 * 2176 * Returns 0 on success. 2177 */ 2178 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2179 void __user *buffer, size_t *lenp, loff_t *ppos) 2180 { 2181 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2182 do_proc_dointvec_ms_jiffies_conv, NULL); 2183 } 2184 2185 #else /* CONFIG_PROC_FS */ 2186 2187 int proc_dostring(ctl_table *table, int write, struct file *filp, 2188 void __user *buffer, size_t *lenp, loff_t *ppos) 2189 { 2190 return -ENOSYS; 2191 } 2192 2193 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 2194 void __user *buffer, size_t *lenp, loff_t *ppos) 2195 { 2196 return -ENOSYS; 2197 } 2198 2199 int proc_dointvec(ctl_table *table, int write, struct file *filp, 2200 void __user *buffer, size_t *lenp, loff_t *ppos) 2201 { 2202 return -ENOSYS; 2203 } 2204 2205 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 2206 void __user *buffer, size_t *lenp, loff_t *ppos) 2207 { 2208 return -ENOSYS; 2209 } 2210 2211 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 2212 void __user *buffer, size_t *lenp, loff_t *ppos) 2213 { 2214 return -ENOSYS; 2215 } 2216 2217 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2218 void __user *buffer, size_t *lenp, loff_t *ppos) 2219 { 2220 return -ENOSYS; 2221 } 2222 2223 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2224 void __user *buffer, size_t *lenp, loff_t *ppos) 2225 { 2226 return -ENOSYS; 2227 } 2228 2229 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2230 void __user *buffer, size_t *lenp, loff_t *ppos) 2231 { 2232 return -ENOSYS; 2233 } 2234 2235 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2236 void __user *buffer, size_t *lenp, loff_t *ppos) 2237 { 2238 return -ENOSYS; 2239 } 2240 2241 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2242 struct file *filp, 2243 void __user *buffer, 2244 size_t *lenp, loff_t *ppos) 2245 { 2246 return -ENOSYS; 2247 } 2248 2249 2250 #endif /* CONFIG_PROC_FS */ 2251 2252 2253 /* 2254 * General sysctl support routines 2255 */ 2256 2257 /* The generic string strategy routine: */ 2258 int sysctl_string(ctl_table *table, int __user *name, int nlen, 2259 void __user *oldval, size_t __user *oldlenp, 2260 void __user *newval, size_t newlen, void **context) 2261 { 2262 if (!table->data || !table->maxlen) 2263 return -ENOTDIR; 2264 2265 if (oldval && oldlenp) { 2266 size_t bufsize; 2267 if (get_user(bufsize, oldlenp)) 2268 return -EFAULT; 2269 if (bufsize) { 2270 size_t len = strlen(table->data), copied; 2271 2272 /* This shouldn't trigger for a well-formed sysctl */ 2273 if (len > table->maxlen) 2274 len = table->maxlen; 2275 2276 /* Copy up to a max of bufsize-1 bytes of the string */ 2277 copied = (len >= bufsize) ? bufsize - 1 : len; 2278 2279 if (copy_to_user(oldval, table->data, copied) || 2280 put_user(0, (char __user *)(oldval + copied))) 2281 return -EFAULT; 2282 if (put_user(len, oldlenp)) 2283 return -EFAULT; 2284 } 2285 } 2286 if (newval && newlen) { 2287 size_t len = newlen; 2288 if (len > table->maxlen) 2289 len = table->maxlen; 2290 if(copy_from_user(table->data, newval, len)) 2291 return -EFAULT; 2292 if (len == table->maxlen) 2293 len--; 2294 ((char *) table->data)[len] = 0; 2295 } 2296 return 1; 2297 } 2298 2299 /* 2300 * This function makes sure that all of the integers in the vector 2301 * are between the minimum and maximum values given in the arrays 2302 * table->extra1 and table->extra2, respectively. 2303 */ 2304 int sysctl_intvec(ctl_table *table, int __user *name, int nlen, 2305 void __user *oldval, size_t __user *oldlenp, 2306 void __user *newval, size_t newlen, void **context) 2307 { 2308 2309 if (newval && newlen) { 2310 int __user *vec = (int __user *) newval; 2311 int *min = (int *) table->extra1; 2312 int *max = (int *) table->extra2; 2313 size_t length; 2314 int i; 2315 2316 if (newlen % sizeof(int) != 0) 2317 return -EINVAL; 2318 2319 if (!table->extra1 && !table->extra2) 2320 return 0; 2321 2322 if (newlen > table->maxlen) 2323 newlen = table->maxlen; 2324 length = newlen / sizeof(int); 2325 2326 for (i = 0; i < length; i++) { 2327 int value; 2328 if (get_user(value, vec + i)) 2329 return -EFAULT; 2330 if (min && value < min[i]) 2331 return -EINVAL; 2332 if (max && value > max[i]) 2333 return -EINVAL; 2334 } 2335 } 2336 return 0; 2337 } 2338 2339 /* Strategy function to convert jiffies to seconds */ 2340 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, 2341 void __user *oldval, size_t __user *oldlenp, 2342 void __user *newval, size_t newlen, void **context) 2343 { 2344 if (oldval) { 2345 size_t olen; 2346 if (oldlenp) { 2347 if (get_user(olen, oldlenp)) 2348 return -EFAULT; 2349 if (olen!=sizeof(int)) 2350 return -EINVAL; 2351 } 2352 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) || 2353 (oldlenp && put_user(sizeof(int),oldlenp))) 2354 return -EFAULT; 2355 } 2356 if (newval && newlen) { 2357 int new; 2358 if (newlen != sizeof(int)) 2359 return -EINVAL; 2360 if (get_user(new, (int __user *)newval)) 2361 return -EFAULT; 2362 *(int *)(table->data) = new*HZ; 2363 } 2364 return 1; 2365 } 2366 2367 /* Strategy function to convert jiffies to seconds */ 2368 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, 2369 void __user *oldval, size_t __user *oldlenp, 2370 void __user *newval, size_t newlen, void **context) 2371 { 2372 if (oldval) { 2373 size_t olen; 2374 if (oldlenp) { 2375 if (get_user(olen, oldlenp)) 2376 return -EFAULT; 2377 if (olen!=sizeof(int)) 2378 return -EINVAL; 2379 } 2380 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) || 2381 (oldlenp && put_user(sizeof(int),oldlenp))) 2382 return -EFAULT; 2383 } 2384 if (newval && newlen) { 2385 int new; 2386 if (newlen != sizeof(int)) 2387 return -EINVAL; 2388 if (get_user(new, (int __user *)newval)) 2389 return -EFAULT; 2390 *(int *)(table->data) = msecs_to_jiffies(new); 2391 } 2392 return 1; 2393 } 2394 2395 #else /* CONFIG_SYSCTL */ 2396 2397 2398 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 2399 { 2400 return -ENOSYS; 2401 } 2402 2403 int sysctl_string(ctl_table *table, int __user *name, int nlen, 2404 void __user *oldval, size_t __user *oldlenp, 2405 void __user *newval, size_t newlen, void **context) 2406 { 2407 return -ENOSYS; 2408 } 2409 2410 int sysctl_intvec(ctl_table *table, int __user *name, int nlen, 2411 void __user *oldval, size_t __user *oldlenp, 2412 void __user *newval, size_t newlen, void **context) 2413 { 2414 return -ENOSYS; 2415 } 2416 2417 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, 2418 void __user *oldval, size_t __user *oldlenp, 2419 void __user *newval, size_t newlen, void **context) 2420 { 2421 return -ENOSYS; 2422 } 2423 2424 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, 2425 void __user *oldval, size_t __user *oldlenp, 2426 void __user *newval, size_t newlen, void **context) 2427 { 2428 return -ENOSYS; 2429 } 2430 2431 int proc_dostring(ctl_table *table, int write, struct file *filp, 2432 void __user *buffer, size_t *lenp, loff_t *ppos) 2433 { 2434 return -ENOSYS; 2435 } 2436 2437 int proc_dointvec(ctl_table *table, int write, struct file *filp, 2438 void __user *buffer, size_t *lenp, loff_t *ppos) 2439 { 2440 return -ENOSYS; 2441 } 2442 2443 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 2444 void __user *buffer, size_t *lenp, loff_t *ppos) 2445 { 2446 return -ENOSYS; 2447 } 2448 2449 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 2450 void __user *buffer, size_t *lenp, loff_t *ppos) 2451 { 2452 return -ENOSYS; 2453 } 2454 2455 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2456 void __user *buffer, size_t *lenp, loff_t *ppos) 2457 { 2458 return -ENOSYS; 2459 } 2460 2461 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2462 void __user *buffer, size_t *lenp, loff_t *ppos) 2463 { 2464 return -ENOSYS; 2465 } 2466 2467 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2468 void __user *buffer, size_t *lenp, loff_t *ppos) 2469 { 2470 return -ENOSYS; 2471 } 2472 2473 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2474 void __user *buffer, size_t *lenp, loff_t *ppos) 2475 { 2476 return -ENOSYS; 2477 } 2478 2479 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2480 struct file *filp, 2481 void __user *buffer, 2482 size_t *lenp, loff_t *ppos) 2483 { 2484 return -ENOSYS; 2485 } 2486 2487 struct ctl_table_header * register_sysctl_table(ctl_table * table, 2488 int insert_at_head) 2489 { 2490 return NULL; 2491 } 2492 2493 void unregister_sysctl_table(struct ctl_table_header * table) 2494 { 2495 } 2496 2497 #endif /* CONFIG_SYSCTL */ 2498 2499 /* 2500 * No sense putting this after each symbol definition, twice, 2501 * exception granted :-) 2502 */ 2503 EXPORT_SYMBOL(proc_dointvec); 2504 EXPORT_SYMBOL(proc_dointvec_jiffies); 2505 EXPORT_SYMBOL(proc_dointvec_minmax); 2506 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2507 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2508 EXPORT_SYMBOL(proc_dostring); 2509 EXPORT_SYMBOL(proc_doulongvec_minmax); 2510 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2511 EXPORT_SYMBOL(register_sysctl_table); 2512 EXPORT_SYMBOL(sysctl_intvec); 2513 EXPORT_SYMBOL(sysctl_jiffies); 2514 EXPORT_SYMBOL(sysctl_ms_jiffies); 2515 EXPORT_SYMBOL(sysctl_string); 2516 EXPORT_SYMBOL(unregister_sysctl_table); 2517