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/ctype.h> 29 #include <linux/utsname.h> 30 #include <linux/capability.h> 31 #include <linux/smp_lock.h> 32 #include <linux/init.h> 33 #include <linux/kernel.h> 34 #include <linux/net.h> 35 #include <linux/sysrq.h> 36 #include <linux/highuid.h> 37 #include <linux/writeback.h> 38 #include <linux/hugetlb.h> 39 #include <linux/security.h> 40 #include <linux/initrd.h> 41 #include <linux/times.h> 42 #include <linux/limits.h> 43 #include <linux/dcache.h> 44 #include <linux/syscalls.h> 45 46 #include <asm/uaccess.h> 47 #include <asm/processor.h> 48 49 #ifdef CONFIG_ROOT_NFS 50 #include <linux/nfs_fs.h> 51 #endif 52 53 #if defined(CONFIG_SYSCTL) 54 55 /* External variables not in a header file. */ 56 extern int C_A_D; 57 extern int sysctl_overcommit_memory; 58 extern int sysctl_overcommit_ratio; 59 extern int max_threads; 60 extern int sysrq_enabled; 61 extern int core_uses_pid; 62 extern int suid_dumpable; 63 extern char core_pattern[]; 64 extern int cad_pid; 65 extern int pid_max; 66 extern int min_free_kbytes; 67 extern int printk_ratelimit_jiffies; 68 extern int printk_ratelimit_burst; 69 extern int pid_max_min, pid_max_max; 70 71 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 72 int unknown_nmi_panic; 73 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *, 74 void __user *, size_t *, loff_t *); 75 #endif 76 77 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 78 static int maxolduid = 65535; 79 static int minolduid; 80 81 static int ngroups_max = NGROUPS_MAX; 82 83 #ifdef CONFIG_KMOD 84 extern char modprobe_path[]; 85 #endif 86 #ifdef CONFIG_HOTPLUG 87 extern char hotplug_path[]; 88 #endif 89 #ifdef CONFIG_CHR_DEV_SG 90 extern int sg_big_buff; 91 #endif 92 #ifdef CONFIG_SYSVIPC 93 extern size_t shm_ctlmax; 94 extern size_t shm_ctlall; 95 extern int shm_ctlmni; 96 extern int msg_ctlmax; 97 extern int msg_ctlmnb; 98 extern int msg_ctlmni; 99 extern int sem_ctls[]; 100 #endif 101 102 #ifdef __sparc__ 103 extern char reboot_command []; 104 extern int stop_a_enabled; 105 extern int scons_pwroff; 106 #endif 107 108 #ifdef __hppa__ 109 extern int pwrsw_enabled; 110 extern int unaligned_enabled; 111 #endif 112 113 #ifdef CONFIG_ARCH_S390 114 #ifdef CONFIG_MATHEMU 115 extern int sysctl_ieee_emulation_warnings; 116 #endif 117 extern int sysctl_userprocess_debug; 118 extern int spin_retry; 119 #endif 120 121 extern int sysctl_hz_timer; 122 123 #ifdef CONFIG_BSD_PROCESS_ACCT 124 extern int acct_parm[]; 125 #endif 126 127 int randomize_va_space = 1; 128 129 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t, 130 ctl_table *, void **); 131 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 132 void __user *buffer, size_t *lenp, loff_t *ppos); 133 134 static ctl_table root_table[]; 135 static struct ctl_table_header root_table_header = 136 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; 137 138 static ctl_table kern_table[]; 139 static ctl_table vm_table[]; 140 static ctl_table proc_table[]; 141 static ctl_table fs_table[]; 142 static ctl_table debug_table[]; 143 static ctl_table dev_table[]; 144 extern ctl_table random_table[]; 145 #ifdef CONFIG_UNIX98_PTYS 146 extern ctl_table pty_table[]; 147 #endif 148 #ifdef CONFIG_INOTIFY 149 extern ctl_table inotify_table[]; 150 #endif 151 152 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 153 int sysctl_legacy_va_layout; 154 #endif 155 156 /* /proc declarations: */ 157 158 #ifdef CONFIG_PROC_FS 159 160 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *); 161 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *); 162 static int proc_opensys(struct inode *, struct file *); 163 164 struct file_operations proc_sys_file_operations = { 165 .open = proc_opensys, 166 .read = proc_readsys, 167 .write = proc_writesys, 168 }; 169 170 extern struct proc_dir_entry *proc_sys_root; 171 172 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *); 173 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *); 174 #endif 175 176 /* The default sysctl tables: */ 177 178 static ctl_table root_table[] = { 179 { 180 .ctl_name = CTL_KERN, 181 .procname = "kernel", 182 .mode = 0555, 183 .child = kern_table, 184 }, 185 { 186 .ctl_name = CTL_VM, 187 .procname = "vm", 188 .mode = 0555, 189 .child = vm_table, 190 }, 191 #ifdef CONFIG_NET 192 { 193 .ctl_name = CTL_NET, 194 .procname = "net", 195 .mode = 0555, 196 .child = net_table, 197 }, 198 #endif 199 { 200 .ctl_name = CTL_PROC, 201 .procname = "proc", 202 .mode = 0555, 203 .child = proc_table, 204 }, 205 { 206 .ctl_name = CTL_FS, 207 .procname = "fs", 208 .mode = 0555, 209 .child = fs_table, 210 }, 211 { 212 .ctl_name = CTL_DEBUG, 213 .procname = "debug", 214 .mode = 0555, 215 .child = debug_table, 216 }, 217 { 218 .ctl_name = CTL_DEV, 219 .procname = "dev", 220 .mode = 0555, 221 .child = dev_table, 222 }, 223 224 { .ctl_name = 0 } 225 }; 226 227 static ctl_table kern_table[] = { 228 { 229 .ctl_name = KERN_OSTYPE, 230 .procname = "ostype", 231 .data = system_utsname.sysname, 232 .maxlen = sizeof(system_utsname.sysname), 233 .mode = 0444, 234 .proc_handler = &proc_doutsstring, 235 .strategy = &sysctl_string, 236 }, 237 { 238 .ctl_name = KERN_OSRELEASE, 239 .procname = "osrelease", 240 .data = system_utsname.release, 241 .maxlen = sizeof(system_utsname.release), 242 .mode = 0444, 243 .proc_handler = &proc_doutsstring, 244 .strategy = &sysctl_string, 245 }, 246 { 247 .ctl_name = KERN_VERSION, 248 .procname = "version", 249 .data = system_utsname.version, 250 .maxlen = sizeof(system_utsname.version), 251 .mode = 0444, 252 .proc_handler = &proc_doutsstring, 253 .strategy = &sysctl_string, 254 }, 255 { 256 .ctl_name = KERN_NODENAME, 257 .procname = "hostname", 258 .data = system_utsname.nodename, 259 .maxlen = sizeof(system_utsname.nodename), 260 .mode = 0644, 261 .proc_handler = &proc_doutsstring, 262 .strategy = &sysctl_string, 263 }, 264 { 265 .ctl_name = KERN_DOMAINNAME, 266 .procname = "domainname", 267 .data = system_utsname.domainname, 268 .maxlen = sizeof(system_utsname.domainname), 269 .mode = 0644, 270 .proc_handler = &proc_doutsstring, 271 .strategy = &sysctl_string, 272 }, 273 { 274 .ctl_name = KERN_PANIC, 275 .procname = "panic", 276 .data = &panic_timeout, 277 .maxlen = sizeof(int), 278 .mode = 0644, 279 .proc_handler = &proc_dointvec, 280 }, 281 { 282 .ctl_name = KERN_CORE_USES_PID, 283 .procname = "core_uses_pid", 284 .data = &core_uses_pid, 285 .maxlen = sizeof(int), 286 .mode = 0644, 287 .proc_handler = &proc_dointvec, 288 }, 289 { 290 .ctl_name = KERN_CORE_PATTERN, 291 .procname = "core_pattern", 292 .data = core_pattern, 293 .maxlen = 64, 294 .mode = 0644, 295 .proc_handler = &proc_dostring, 296 .strategy = &sysctl_string, 297 }, 298 { 299 .ctl_name = KERN_TAINTED, 300 .procname = "tainted", 301 .data = &tainted, 302 .maxlen = sizeof(int), 303 .mode = 0444, 304 .proc_handler = &proc_dointvec, 305 }, 306 { 307 .ctl_name = KERN_CAP_BSET, 308 .procname = "cap-bound", 309 .data = &cap_bset, 310 .maxlen = sizeof(kernel_cap_t), 311 .mode = 0600, 312 .proc_handler = &proc_dointvec_bset, 313 }, 314 #ifdef CONFIG_BLK_DEV_INITRD 315 { 316 .ctl_name = KERN_REALROOTDEV, 317 .procname = "real-root-dev", 318 .data = &real_root_dev, 319 .maxlen = sizeof(int), 320 .mode = 0644, 321 .proc_handler = &proc_dointvec, 322 }, 323 #endif 324 #ifdef __sparc__ 325 { 326 .ctl_name = KERN_SPARC_REBOOT, 327 .procname = "reboot-cmd", 328 .data = reboot_command, 329 .maxlen = 256, 330 .mode = 0644, 331 .proc_handler = &proc_dostring, 332 .strategy = &sysctl_string, 333 }, 334 { 335 .ctl_name = KERN_SPARC_STOP_A, 336 .procname = "stop-a", 337 .data = &stop_a_enabled, 338 .maxlen = sizeof (int), 339 .mode = 0644, 340 .proc_handler = &proc_dointvec, 341 }, 342 { 343 .ctl_name = KERN_SPARC_SCONS_PWROFF, 344 .procname = "scons-poweroff", 345 .data = &scons_pwroff, 346 .maxlen = sizeof (int), 347 .mode = 0644, 348 .proc_handler = &proc_dointvec, 349 }, 350 #endif 351 #ifdef __hppa__ 352 { 353 .ctl_name = KERN_HPPA_PWRSW, 354 .procname = "soft-power", 355 .data = &pwrsw_enabled, 356 .maxlen = sizeof (int), 357 .mode = 0644, 358 .proc_handler = &proc_dointvec, 359 }, 360 { 361 .ctl_name = KERN_HPPA_UNALIGNED, 362 .procname = "unaligned-trap", 363 .data = &unaligned_enabled, 364 .maxlen = sizeof (int), 365 .mode = 0644, 366 .proc_handler = &proc_dointvec, 367 }, 368 #endif 369 { 370 .ctl_name = KERN_CTLALTDEL, 371 .procname = "ctrl-alt-del", 372 .data = &C_A_D, 373 .maxlen = sizeof(int), 374 .mode = 0644, 375 .proc_handler = &proc_dointvec, 376 }, 377 { 378 .ctl_name = KERN_PRINTK, 379 .procname = "printk", 380 .data = &console_loglevel, 381 .maxlen = 4*sizeof(int), 382 .mode = 0644, 383 .proc_handler = &proc_dointvec, 384 }, 385 #ifdef CONFIG_KMOD 386 { 387 .ctl_name = KERN_MODPROBE, 388 .procname = "modprobe", 389 .data = &modprobe_path, 390 .maxlen = KMOD_PATH_LEN, 391 .mode = 0644, 392 .proc_handler = &proc_dostring, 393 .strategy = &sysctl_string, 394 }, 395 #endif 396 #ifdef CONFIG_HOTPLUG 397 { 398 .ctl_name = KERN_HOTPLUG, 399 .procname = "hotplug", 400 .data = &hotplug_path, 401 .maxlen = HOTPLUG_PATH_LEN, 402 .mode = 0644, 403 .proc_handler = &proc_dostring, 404 .strategy = &sysctl_string, 405 }, 406 #endif 407 #ifdef CONFIG_CHR_DEV_SG 408 { 409 .ctl_name = KERN_SG_BIG_BUFF, 410 .procname = "sg-big-buff", 411 .data = &sg_big_buff, 412 .maxlen = sizeof (int), 413 .mode = 0444, 414 .proc_handler = &proc_dointvec, 415 }, 416 #endif 417 #ifdef CONFIG_BSD_PROCESS_ACCT 418 { 419 .ctl_name = KERN_ACCT, 420 .procname = "acct", 421 .data = &acct_parm, 422 .maxlen = 3*sizeof(int), 423 .mode = 0644, 424 .proc_handler = &proc_dointvec, 425 }, 426 #endif 427 #ifdef CONFIG_SYSVIPC 428 { 429 .ctl_name = KERN_SHMMAX, 430 .procname = "shmmax", 431 .data = &shm_ctlmax, 432 .maxlen = sizeof (size_t), 433 .mode = 0644, 434 .proc_handler = &proc_doulongvec_minmax, 435 }, 436 { 437 .ctl_name = KERN_SHMALL, 438 .procname = "shmall", 439 .data = &shm_ctlall, 440 .maxlen = sizeof (size_t), 441 .mode = 0644, 442 .proc_handler = &proc_doulongvec_minmax, 443 }, 444 { 445 .ctl_name = KERN_SHMMNI, 446 .procname = "shmmni", 447 .data = &shm_ctlmni, 448 .maxlen = sizeof (int), 449 .mode = 0644, 450 .proc_handler = &proc_dointvec, 451 }, 452 { 453 .ctl_name = KERN_MSGMAX, 454 .procname = "msgmax", 455 .data = &msg_ctlmax, 456 .maxlen = sizeof (int), 457 .mode = 0644, 458 .proc_handler = &proc_dointvec, 459 }, 460 { 461 .ctl_name = KERN_MSGMNI, 462 .procname = "msgmni", 463 .data = &msg_ctlmni, 464 .maxlen = sizeof (int), 465 .mode = 0644, 466 .proc_handler = &proc_dointvec, 467 }, 468 { 469 .ctl_name = KERN_MSGMNB, 470 .procname = "msgmnb", 471 .data = &msg_ctlmnb, 472 .maxlen = sizeof (int), 473 .mode = 0644, 474 .proc_handler = &proc_dointvec, 475 }, 476 { 477 .ctl_name = KERN_SEM, 478 .procname = "sem", 479 .data = &sem_ctls, 480 .maxlen = 4*sizeof (int), 481 .mode = 0644, 482 .proc_handler = &proc_dointvec, 483 }, 484 #endif 485 #ifdef CONFIG_MAGIC_SYSRQ 486 { 487 .ctl_name = KERN_SYSRQ, 488 .procname = "sysrq", 489 .data = &sysrq_enabled, 490 .maxlen = sizeof (int), 491 .mode = 0644, 492 .proc_handler = &proc_dointvec, 493 }, 494 #endif 495 { 496 .ctl_name = KERN_CADPID, 497 .procname = "cad_pid", 498 .data = &cad_pid, 499 .maxlen = sizeof (int), 500 .mode = 0600, 501 .proc_handler = &proc_dointvec, 502 }, 503 { 504 .ctl_name = KERN_MAX_THREADS, 505 .procname = "threads-max", 506 .data = &max_threads, 507 .maxlen = sizeof(int), 508 .mode = 0644, 509 .proc_handler = &proc_dointvec, 510 }, 511 { 512 .ctl_name = KERN_RANDOM, 513 .procname = "random", 514 .mode = 0555, 515 .child = random_table, 516 }, 517 #ifdef CONFIG_UNIX98_PTYS 518 { 519 .ctl_name = KERN_PTY, 520 .procname = "pty", 521 .mode = 0555, 522 .child = pty_table, 523 }, 524 #endif 525 { 526 .ctl_name = KERN_OVERFLOWUID, 527 .procname = "overflowuid", 528 .data = &overflowuid, 529 .maxlen = sizeof(int), 530 .mode = 0644, 531 .proc_handler = &proc_dointvec_minmax, 532 .strategy = &sysctl_intvec, 533 .extra1 = &minolduid, 534 .extra2 = &maxolduid, 535 }, 536 { 537 .ctl_name = KERN_OVERFLOWGID, 538 .procname = "overflowgid", 539 .data = &overflowgid, 540 .maxlen = sizeof(int), 541 .mode = 0644, 542 .proc_handler = &proc_dointvec_minmax, 543 .strategy = &sysctl_intvec, 544 .extra1 = &minolduid, 545 .extra2 = &maxolduid, 546 }, 547 #ifdef CONFIG_ARCH_S390 548 #ifdef CONFIG_MATHEMU 549 { 550 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 551 .procname = "ieee_emulation_warnings", 552 .data = &sysctl_ieee_emulation_warnings, 553 .maxlen = sizeof(int), 554 .mode = 0644, 555 .proc_handler = &proc_dointvec, 556 }, 557 #endif 558 #ifdef CONFIG_NO_IDLE_HZ 559 { 560 .ctl_name = KERN_HZ_TIMER, 561 .procname = "hz_timer", 562 .data = &sysctl_hz_timer, 563 .maxlen = sizeof(int), 564 .mode = 0644, 565 .proc_handler = &proc_dointvec, 566 }, 567 #endif 568 { 569 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 570 .procname = "userprocess_debug", 571 .data = &sysctl_userprocess_debug, 572 .maxlen = sizeof(int), 573 .mode = 0644, 574 .proc_handler = &proc_dointvec, 575 }, 576 #endif 577 { 578 .ctl_name = KERN_PIDMAX, 579 .procname = "pid_max", 580 .data = &pid_max, 581 .maxlen = sizeof (int), 582 .mode = 0644, 583 .proc_handler = &proc_dointvec_minmax, 584 .strategy = sysctl_intvec, 585 .extra1 = &pid_max_min, 586 .extra2 = &pid_max_max, 587 }, 588 { 589 .ctl_name = KERN_PANIC_ON_OOPS, 590 .procname = "panic_on_oops", 591 .data = &panic_on_oops, 592 .maxlen = sizeof(int), 593 .mode = 0644, 594 .proc_handler = &proc_dointvec, 595 }, 596 { 597 .ctl_name = KERN_PRINTK_RATELIMIT, 598 .procname = "printk_ratelimit", 599 .data = &printk_ratelimit_jiffies, 600 .maxlen = sizeof(int), 601 .mode = 0644, 602 .proc_handler = &proc_dointvec_jiffies, 603 .strategy = &sysctl_jiffies, 604 }, 605 { 606 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 607 .procname = "printk_ratelimit_burst", 608 .data = &printk_ratelimit_burst, 609 .maxlen = sizeof(int), 610 .mode = 0644, 611 .proc_handler = &proc_dointvec, 612 }, 613 { 614 .ctl_name = KERN_NGROUPS_MAX, 615 .procname = "ngroups_max", 616 .data = &ngroups_max, 617 .maxlen = sizeof (int), 618 .mode = 0444, 619 .proc_handler = &proc_dointvec, 620 }, 621 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 622 { 623 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 624 .procname = "unknown_nmi_panic", 625 .data = &unknown_nmi_panic, 626 .maxlen = sizeof (int), 627 .mode = 0644, 628 .proc_handler = &proc_unknown_nmi_panic, 629 }, 630 #endif 631 #if defined(CONFIG_X86) 632 { 633 .ctl_name = KERN_BOOTLOADER_TYPE, 634 .procname = "bootloader_type", 635 .data = &bootloader_type, 636 .maxlen = sizeof (int), 637 .mode = 0444, 638 .proc_handler = &proc_dointvec, 639 }, 640 #endif 641 { 642 .ctl_name = KERN_RANDOMIZE, 643 .procname = "randomize_va_space", 644 .data = &randomize_va_space, 645 .maxlen = sizeof(int), 646 .mode = 0644, 647 .proc_handler = &proc_dointvec, 648 }, 649 #if defined(CONFIG_ARCH_S390) 650 { 651 .ctl_name = KERN_SPIN_RETRY, 652 .procname = "spin_retry", 653 .data = &spin_retry, 654 .maxlen = sizeof (int), 655 .mode = 0644, 656 .proc_handler = &proc_dointvec, 657 }, 658 #endif 659 { .ctl_name = 0 } 660 }; 661 662 /* Constants for minimum and maximum testing in vm_table. 663 We use these as one-element integer vectors. */ 664 static int zero; 665 static int one_hundred = 100; 666 667 668 static ctl_table vm_table[] = { 669 { 670 .ctl_name = VM_OVERCOMMIT_MEMORY, 671 .procname = "overcommit_memory", 672 .data = &sysctl_overcommit_memory, 673 .maxlen = sizeof(sysctl_overcommit_memory), 674 .mode = 0644, 675 .proc_handler = &proc_dointvec, 676 }, 677 { 678 .ctl_name = VM_OVERCOMMIT_RATIO, 679 .procname = "overcommit_ratio", 680 .data = &sysctl_overcommit_ratio, 681 .maxlen = sizeof(sysctl_overcommit_ratio), 682 .mode = 0644, 683 .proc_handler = &proc_dointvec, 684 }, 685 { 686 .ctl_name = VM_PAGE_CLUSTER, 687 .procname = "page-cluster", 688 .data = &page_cluster, 689 .maxlen = sizeof(int), 690 .mode = 0644, 691 .proc_handler = &proc_dointvec, 692 }, 693 { 694 .ctl_name = VM_DIRTY_BACKGROUND, 695 .procname = "dirty_background_ratio", 696 .data = &dirty_background_ratio, 697 .maxlen = sizeof(dirty_background_ratio), 698 .mode = 0644, 699 .proc_handler = &proc_dointvec_minmax, 700 .strategy = &sysctl_intvec, 701 .extra1 = &zero, 702 .extra2 = &one_hundred, 703 }, 704 { 705 .ctl_name = VM_DIRTY_RATIO, 706 .procname = "dirty_ratio", 707 .data = &vm_dirty_ratio, 708 .maxlen = sizeof(vm_dirty_ratio), 709 .mode = 0644, 710 .proc_handler = &proc_dointvec_minmax, 711 .strategy = &sysctl_intvec, 712 .extra1 = &zero, 713 .extra2 = &one_hundred, 714 }, 715 { 716 .ctl_name = VM_DIRTY_WB_CS, 717 .procname = "dirty_writeback_centisecs", 718 .data = &dirty_writeback_centisecs, 719 .maxlen = sizeof(dirty_writeback_centisecs), 720 .mode = 0644, 721 .proc_handler = &dirty_writeback_centisecs_handler, 722 }, 723 { 724 .ctl_name = VM_DIRTY_EXPIRE_CS, 725 .procname = "dirty_expire_centisecs", 726 .data = &dirty_expire_centisecs, 727 .maxlen = sizeof(dirty_expire_centisecs), 728 .mode = 0644, 729 .proc_handler = &proc_dointvec, 730 }, 731 { 732 .ctl_name = VM_NR_PDFLUSH_THREADS, 733 .procname = "nr_pdflush_threads", 734 .data = &nr_pdflush_threads, 735 .maxlen = sizeof nr_pdflush_threads, 736 .mode = 0444 /* read-only*/, 737 .proc_handler = &proc_dointvec, 738 }, 739 { 740 .ctl_name = VM_SWAPPINESS, 741 .procname = "swappiness", 742 .data = &vm_swappiness, 743 .maxlen = sizeof(vm_swappiness), 744 .mode = 0644, 745 .proc_handler = &proc_dointvec_minmax, 746 .strategy = &sysctl_intvec, 747 .extra1 = &zero, 748 .extra2 = &one_hundred, 749 }, 750 #ifdef CONFIG_HUGETLB_PAGE 751 { 752 .ctl_name = VM_HUGETLB_PAGES, 753 .procname = "nr_hugepages", 754 .data = &max_huge_pages, 755 .maxlen = sizeof(unsigned long), 756 .mode = 0644, 757 .proc_handler = &hugetlb_sysctl_handler, 758 .extra1 = (void *)&hugetlb_zero, 759 .extra2 = (void *)&hugetlb_infinity, 760 }, 761 { 762 .ctl_name = VM_HUGETLB_GROUP, 763 .procname = "hugetlb_shm_group", 764 .data = &sysctl_hugetlb_shm_group, 765 .maxlen = sizeof(gid_t), 766 .mode = 0644, 767 .proc_handler = &proc_dointvec, 768 }, 769 #endif 770 { 771 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 772 .procname = "lowmem_reserve_ratio", 773 .data = &sysctl_lowmem_reserve_ratio, 774 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 775 .mode = 0644, 776 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 777 .strategy = &sysctl_intvec, 778 }, 779 { 780 .ctl_name = VM_MIN_FREE_KBYTES, 781 .procname = "min_free_kbytes", 782 .data = &min_free_kbytes, 783 .maxlen = sizeof(min_free_kbytes), 784 .mode = 0644, 785 .proc_handler = &min_free_kbytes_sysctl_handler, 786 .strategy = &sysctl_intvec, 787 .extra1 = &zero, 788 }, 789 #ifdef CONFIG_MMU 790 { 791 .ctl_name = VM_MAX_MAP_COUNT, 792 .procname = "max_map_count", 793 .data = &sysctl_max_map_count, 794 .maxlen = sizeof(sysctl_max_map_count), 795 .mode = 0644, 796 .proc_handler = &proc_dointvec 797 }, 798 #endif 799 { 800 .ctl_name = VM_LAPTOP_MODE, 801 .procname = "laptop_mode", 802 .data = &laptop_mode, 803 .maxlen = sizeof(laptop_mode), 804 .mode = 0644, 805 .proc_handler = &proc_dointvec, 806 .strategy = &sysctl_intvec, 807 .extra1 = &zero, 808 }, 809 { 810 .ctl_name = VM_BLOCK_DUMP, 811 .procname = "block_dump", 812 .data = &block_dump, 813 .maxlen = sizeof(block_dump), 814 .mode = 0644, 815 .proc_handler = &proc_dointvec, 816 .strategy = &sysctl_intvec, 817 .extra1 = &zero, 818 }, 819 { 820 .ctl_name = VM_VFS_CACHE_PRESSURE, 821 .procname = "vfs_cache_pressure", 822 .data = &sysctl_vfs_cache_pressure, 823 .maxlen = sizeof(sysctl_vfs_cache_pressure), 824 .mode = 0644, 825 .proc_handler = &proc_dointvec, 826 .strategy = &sysctl_intvec, 827 .extra1 = &zero, 828 }, 829 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 830 { 831 .ctl_name = VM_LEGACY_VA_LAYOUT, 832 .procname = "legacy_va_layout", 833 .data = &sysctl_legacy_va_layout, 834 .maxlen = sizeof(sysctl_legacy_va_layout), 835 .mode = 0644, 836 .proc_handler = &proc_dointvec, 837 .strategy = &sysctl_intvec, 838 .extra1 = &zero, 839 }, 840 #endif 841 #ifdef CONFIG_SWAP 842 { 843 .ctl_name = VM_SWAP_TOKEN_TIMEOUT, 844 .procname = "swap_token_timeout", 845 .data = &swap_token_default_timeout, 846 .maxlen = sizeof(swap_token_default_timeout), 847 .mode = 0644, 848 .proc_handler = &proc_dointvec_jiffies, 849 .strategy = &sysctl_jiffies, 850 }, 851 #endif 852 { .ctl_name = 0 } 853 }; 854 855 static ctl_table proc_table[] = { 856 { .ctl_name = 0 } 857 }; 858 859 static ctl_table fs_table[] = { 860 { 861 .ctl_name = FS_NRINODE, 862 .procname = "inode-nr", 863 .data = &inodes_stat, 864 .maxlen = 2*sizeof(int), 865 .mode = 0444, 866 .proc_handler = &proc_dointvec, 867 }, 868 { 869 .ctl_name = FS_STATINODE, 870 .procname = "inode-state", 871 .data = &inodes_stat, 872 .maxlen = 7*sizeof(int), 873 .mode = 0444, 874 .proc_handler = &proc_dointvec, 875 }, 876 { 877 .ctl_name = FS_NRFILE, 878 .procname = "file-nr", 879 .data = &files_stat, 880 .maxlen = 3*sizeof(int), 881 .mode = 0444, 882 .proc_handler = &proc_dointvec, 883 }, 884 { 885 .ctl_name = FS_MAXFILE, 886 .procname = "file-max", 887 .data = &files_stat.max_files, 888 .maxlen = sizeof(int), 889 .mode = 0644, 890 .proc_handler = &proc_dointvec, 891 }, 892 { 893 .ctl_name = FS_DENTRY, 894 .procname = "dentry-state", 895 .data = &dentry_stat, 896 .maxlen = 6*sizeof(int), 897 .mode = 0444, 898 .proc_handler = &proc_dointvec, 899 }, 900 { 901 .ctl_name = FS_OVERFLOWUID, 902 .procname = "overflowuid", 903 .data = &fs_overflowuid, 904 .maxlen = sizeof(int), 905 .mode = 0644, 906 .proc_handler = &proc_dointvec_minmax, 907 .strategy = &sysctl_intvec, 908 .extra1 = &minolduid, 909 .extra2 = &maxolduid, 910 }, 911 { 912 .ctl_name = FS_OVERFLOWGID, 913 .procname = "overflowgid", 914 .data = &fs_overflowgid, 915 .maxlen = sizeof(int), 916 .mode = 0644, 917 .proc_handler = &proc_dointvec_minmax, 918 .strategy = &sysctl_intvec, 919 .extra1 = &minolduid, 920 .extra2 = &maxolduid, 921 }, 922 { 923 .ctl_name = FS_LEASES, 924 .procname = "leases-enable", 925 .data = &leases_enable, 926 .maxlen = sizeof(int), 927 .mode = 0644, 928 .proc_handler = &proc_dointvec, 929 }, 930 #ifdef CONFIG_DNOTIFY 931 { 932 .ctl_name = FS_DIR_NOTIFY, 933 .procname = "dir-notify-enable", 934 .data = &dir_notify_enable, 935 .maxlen = sizeof(int), 936 .mode = 0644, 937 .proc_handler = &proc_dointvec, 938 }, 939 #endif 940 #ifdef CONFIG_MMU 941 { 942 .ctl_name = FS_LEASE_TIME, 943 .procname = "lease-break-time", 944 .data = &lease_break_time, 945 .maxlen = sizeof(int), 946 .mode = 0644, 947 .proc_handler = &proc_dointvec, 948 }, 949 { 950 .ctl_name = FS_AIO_NR, 951 .procname = "aio-nr", 952 .data = &aio_nr, 953 .maxlen = sizeof(aio_nr), 954 .mode = 0444, 955 .proc_handler = &proc_doulongvec_minmax, 956 }, 957 { 958 .ctl_name = FS_AIO_MAX_NR, 959 .procname = "aio-max-nr", 960 .data = &aio_max_nr, 961 .maxlen = sizeof(aio_max_nr), 962 .mode = 0644, 963 .proc_handler = &proc_doulongvec_minmax, 964 }, 965 #ifdef CONFIG_INOTIFY 966 { 967 .ctl_name = FS_INOTIFY, 968 .procname = "inotify", 969 .mode = 0555, 970 .child = inotify_table, 971 }, 972 #endif 973 #endif 974 { 975 .ctl_name = KERN_SETUID_DUMPABLE, 976 .procname = "suid_dumpable", 977 .data = &suid_dumpable, 978 .maxlen = sizeof(int), 979 .mode = 0644, 980 .proc_handler = &proc_dointvec, 981 }, 982 { .ctl_name = 0 } 983 }; 984 985 static ctl_table debug_table[] = { 986 { .ctl_name = 0 } 987 }; 988 989 static ctl_table dev_table[] = { 990 { .ctl_name = 0 } 991 }; 992 993 extern void init_irq_proc (void); 994 995 static DEFINE_SPINLOCK(sysctl_lock); 996 997 /* called under sysctl_lock */ 998 static int use_table(struct ctl_table_header *p) 999 { 1000 if (unlikely(p->unregistering)) 1001 return 0; 1002 p->used++; 1003 return 1; 1004 } 1005 1006 /* called under sysctl_lock */ 1007 static void unuse_table(struct ctl_table_header *p) 1008 { 1009 if (!--p->used) 1010 if (unlikely(p->unregistering)) 1011 complete(p->unregistering); 1012 } 1013 1014 /* called under sysctl_lock, will reacquire if has to wait */ 1015 static void start_unregistering(struct ctl_table_header *p) 1016 { 1017 /* 1018 * if p->used is 0, nobody will ever touch that entry again; 1019 * we'll eliminate all paths to it before dropping sysctl_lock 1020 */ 1021 if (unlikely(p->used)) { 1022 struct completion wait; 1023 init_completion(&wait); 1024 p->unregistering = &wait; 1025 spin_unlock(&sysctl_lock); 1026 wait_for_completion(&wait); 1027 spin_lock(&sysctl_lock); 1028 } 1029 /* 1030 * do not remove from the list until nobody holds it; walking the 1031 * list in do_sysctl() relies on that. 1032 */ 1033 list_del_init(&p->ctl_entry); 1034 } 1035 1036 void __init sysctl_init(void) 1037 { 1038 #ifdef CONFIG_PROC_FS 1039 register_proc_table(root_table, proc_sys_root, &root_table_header); 1040 init_irq_proc(); 1041 #endif 1042 } 1043 1044 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1045 void __user *newval, size_t newlen) 1046 { 1047 struct list_head *tmp; 1048 int error = -ENOTDIR; 1049 1050 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1051 return -ENOTDIR; 1052 if (oldval) { 1053 int old_len; 1054 if (!oldlenp || get_user(old_len, oldlenp)) 1055 return -EFAULT; 1056 } 1057 spin_lock(&sysctl_lock); 1058 tmp = &root_table_header.ctl_entry; 1059 do { 1060 struct ctl_table_header *head = 1061 list_entry(tmp, struct ctl_table_header, ctl_entry); 1062 void *context = NULL; 1063 1064 if (!use_table(head)) 1065 continue; 1066 1067 spin_unlock(&sysctl_lock); 1068 1069 error = parse_table(name, nlen, oldval, oldlenp, 1070 newval, newlen, head->ctl_table, 1071 &context); 1072 kfree(context); 1073 1074 spin_lock(&sysctl_lock); 1075 unuse_table(head); 1076 if (error != -ENOTDIR) 1077 break; 1078 } while ((tmp = tmp->next) != &root_table_header.ctl_entry); 1079 spin_unlock(&sysctl_lock); 1080 return error; 1081 } 1082 1083 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 1084 { 1085 struct __sysctl_args tmp; 1086 int error; 1087 1088 if (copy_from_user(&tmp, args, sizeof(tmp))) 1089 return -EFAULT; 1090 1091 lock_kernel(); 1092 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1093 tmp.newval, tmp.newlen); 1094 unlock_kernel(); 1095 return error; 1096 } 1097 1098 /* 1099 * ctl_perm does NOT grant the superuser all rights automatically, because 1100 * some sysctl variables are readonly even to root. 1101 */ 1102 1103 static int test_perm(int mode, int op) 1104 { 1105 if (!current->euid) 1106 mode >>= 6; 1107 else if (in_egroup_p(0)) 1108 mode >>= 3; 1109 if ((mode & op & 0007) == op) 1110 return 0; 1111 return -EACCES; 1112 } 1113 1114 static inline int ctl_perm(ctl_table *table, int op) 1115 { 1116 int error; 1117 error = security_sysctl(table, op); 1118 if (error) 1119 return error; 1120 return test_perm(table->mode, op); 1121 } 1122 1123 static int parse_table(int __user *name, int nlen, 1124 void __user *oldval, size_t __user *oldlenp, 1125 void __user *newval, size_t newlen, 1126 ctl_table *table, void **context) 1127 { 1128 int n; 1129 repeat: 1130 if (!nlen) 1131 return -ENOTDIR; 1132 if (get_user(n, name)) 1133 return -EFAULT; 1134 for ( ; table->ctl_name; table++) { 1135 if (n == table->ctl_name || table->ctl_name == CTL_ANY) { 1136 int error; 1137 if (table->child) { 1138 if (ctl_perm(table, 001)) 1139 return -EPERM; 1140 if (table->strategy) { 1141 error = table->strategy( 1142 table, name, nlen, 1143 oldval, oldlenp, 1144 newval, newlen, context); 1145 if (error) 1146 return error; 1147 } 1148 name++; 1149 nlen--; 1150 table = table->child; 1151 goto repeat; 1152 } 1153 error = do_sysctl_strategy(table, name, nlen, 1154 oldval, oldlenp, 1155 newval, newlen, context); 1156 return error; 1157 } 1158 } 1159 return -ENOTDIR; 1160 } 1161 1162 /* Perform the actual read/write of a sysctl table entry. */ 1163 int do_sysctl_strategy (ctl_table *table, 1164 int __user *name, int nlen, 1165 void __user *oldval, size_t __user *oldlenp, 1166 void __user *newval, size_t newlen, void **context) 1167 { 1168 int op = 0, rc; 1169 size_t len; 1170 1171 if (oldval) 1172 op |= 004; 1173 if (newval) 1174 op |= 002; 1175 if (ctl_perm(table, op)) 1176 return -EPERM; 1177 1178 if (table->strategy) { 1179 rc = table->strategy(table, name, nlen, oldval, oldlenp, 1180 newval, newlen, context); 1181 if (rc < 0) 1182 return rc; 1183 if (rc > 0) 1184 return 0; 1185 } 1186 1187 /* If there is no strategy routine, or if the strategy returns 1188 * zero, proceed with automatic r/w */ 1189 if (table->data && table->maxlen) { 1190 if (oldval && oldlenp) { 1191 if (get_user(len, oldlenp)) 1192 return -EFAULT; 1193 if (len) { 1194 if (len > table->maxlen) 1195 len = table->maxlen; 1196 if(copy_to_user(oldval, table->data, len)) 1197 return -EFAULT; 1198 if(put_user(len, oldlenp)) 1199 return -EFAULT; 1200 } 1201 } 1202 if (newval && newlen) { 1203 len = newlen; 1204 if (len > table->maxlen) 1205 len = table->maxlen; 1206 if(copy_from_user(table->data, newval, len)) 1207 return -EFAULT; 1208 } 1209 } 1210 return 0; 1211 } 1212 1213 /** 1214 * register_sysctl_table - register a sysctl hierarchy 1215 * @table: the top-level table structure 1216 * @insert_at_head: whether the entry should be inserted in front or at the end 1217 * 1218 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1219 * array. An entry with a ctl_name of 0 terminates the table. 1220 * 1221 * The members of the &ctl_table structure are used as follows: 1222 * 1223 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1224 * must be unique within that level of sysctl 1225 * 1226 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1227 * enter a sysctl file 1228 * 1229 * data - a pointer to data for use by proc_handler 1230 * 1231 * maxlen - the maximum size in bytes of the data 1232 * 1233 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1234 * 1235 * child - a pointer to the child sysctl table if this entry is a directory, or 1236 * %NULL. 1237 * 1238 * proc_handler - the text handler routine (described below) 1239 * 1240 * strategy - the strategy routine (described below) 1241 * 1242 * de - for internal use by the sysctl routines 1243 * 1244 * extra1, extra2 - extra pointers usable by the proc handler routines 1245 * 1246 * Leaf nodes in the sysctl tree will be represented by a single file 1247 * under /proc; non-leaf nodes will be represented by directories. 1248 * 1249 * sysctl(2) can automatically manage read and write requests through 1250 * the sysctl table. The data and maxlen fields of the ctl_table 1251 * struct enable minimal validation of the values being written to be 1252 * performed, and the mode field allows minimal authentication. 1253 * 1254 * More sophisticated management can be enabled by the provision of a 1255 * strategy routine with the table entry. This will be called before 1256 * any automatic read or write of the data is performed. 1257 * 1258 * The strategy routine may return 1259 * 1260 * < 0 - Error occurred (error is passed to user process) 1261 * 1262 * 0 - OK - proceed with automatic read or write. 1263 * 1264 * > 0 - OK - read or write has been done by the strategy routine, so 1265 * return immediately. 1266 * 1267 * There must be a proc_handler routine for any terminal nodes 1268 * mirrored under /proc/sys (non-terminals are handled by a built-in 1269 * directory handler). Several default handlers are available to 1270 * cover common cases - 1271 * 1272 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1273 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1274 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1275 * 1276 * It is the handler's job to read the input buffer from user memory 1277 * and process it. The handler should return 0 on success. 1278 * 1279 * This routine returns %NULL on a failure to register, and a pointer 1280 * to the table header on success. 1281 */ 1282 struct ctl_table_header *register_sysctl_table(ctl_table * table, 1283 int insert_at_head) 1284 { 1285 struct ctl_table_header *tmp; 1286 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); 1287 if (!tmp) 1288 return NULL; 1289 tmp->ctl_table = table; 1290 INIT_LIST_HEAD(&tmp->ctl_entry); 1291 tmp->used = 0; 1292 tmp->unregistering = NULL; 1293 spin_lock(&sysctl_lock); 1294 if (insert_at_head) 1295 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); 1296 else 1297 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); 1298 spin_unlock(&sysctl_lock); 1299 #ifdef CONFIG_PROC_FS 1300 register_proc_table(table, proc_sys_root, tmp); 1301 #endif 1302 return tmp; 1303 } 1304 1305 /** 1306 * unregister_sysctl_table - unregister a sysctl table hierarchy 1307 * @header: the header returned from register_sysctl_table 1308 * 1309 * Unregisters the sysctl table and all children. proc entries may not 1310 * actually be removed until they are no longer used by anyone. 1311 */ 1312 void unregister_sysctl_table(struct ctl_table_header * header) 1313 { 1314 might_sleep(); 1315 spin_lock(&sysctl_lock); 1316 start_unregistering(header); 1317 #ifdef CONFIG_PROC_FS 1318 unregister_proc_table(header->ctl_table, proc_sys_root); 1319 #endif 1320 spin_unlock(&sysctl_lock); 1321 kfree(header); 1322 } 1323 1324 /* 1325 * /proc/sys support 1326 */ 1327 1328 #ifdef CONFIG_PROC_FS 1329 1330 /* Scan the sysctl entries in table and add them all into /proc */ 1331 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set) 1332 { 1333 struct proc_dir_entry *de; 1334 int len; 1335 mode_t mode; 1336 1337 for (; table->ctl_name; table++) { 1338 /* Can't do anything without a proc name. */ 1339 if (!table->procname) 1340 continue; 1341 /* Maybe we can't do anything with it... */ 1342 if (!table->proc_handler && !table->child) { 1343 printk(KERN_WARNING "SYSCTL: Can't register %s\n", 1344 table->procname); 1345 continue; 1346 } 1347 1348 len = strlen(table->procname); 1349 mode = table->mode; 1350 1351 de = NULL; 1352 if (table->proc_handler) 1353 mode |= S_IFREG; 1354 else { 1355 mode |= S_IFDIR; 1356 for (de = root->subdir; de; de = de->next) { 1357 if (proc_match(len, table->procname, de)) 1358 break; 1359 } 1360 /* If the subdir exists already, de is non-NULL */ 1361 } 1362 1363 if (!de) { 1364 de = create_proc_entry(table->procname, mode, root); 1365 if (!de) 1366 continue; 1367 de->set = set; 1368 de->data = (void *) table; 1369 if (table->proc_handler) 1370 de->proc_fops = &proc_sys_file_operations; 1371 } 1372 table->de = de; 1373 if (de->mode & S_IFDIR) 1374 register_proc_table(table->child, de, set); 1375 } 1376 } 1377 1378 /* 1379 * Unregister a /proc sysctl table and any subdirectories. 1380 */ 1381 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) 1382 { 1383 struct proc_dir_entry *de; 1384 for (; table->ctl_name; table++) { 1385 if (!(de = table->de)) 1386 continue; 1387 if (de->mode & S_IFDIR) { 1388 if (!table->child) { 1389 printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); 1390 continue; 1391 } 1392 unregister_proc_table(table->child, de); 1393 1394 /* Don't unregister directories which still have entries.. */ 1395 if (de->subdir) 1396 continue; 1397 } 1398 1399 /* 1400 * In any case, mark the entry as goner; we'll keep it 1401 * around if it's busy, but we'll know to do nothing with 1402 * its fields. We are under sysctl_lock here. 1403 */ 1404 de->data = NULL; 1405 1406 /* Don't unregister proc entries that are still being used.. */ 1407 if (atomic_read(&de->count)) 1408 continue; 1409 1410 table->de = NULL; 1411 remove_proc_entry(table->procname, root); 1412 } 1413 } 1414 1415 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf, 1416 size_t count, loff_t *ppos) 1417 { 1418 int op; 1419 struct proc_dir_entry *de = PDE(file->f_dentry->d_inode); 1420 struct ctl_table *table; 1421 size_t res; 1422 ssize_t error = -ENOTDIR; 1423 1424 spin_lock(&sysctl_lock); 1425 if (de && de->data && use_table(de->set)) { 1426 /* 1427 * at that point we know that sysctl was not unregistered 1428 * and won't be until we finish 1429 */ 1430 spin_unlock(&sysctl_lock); 1431 table = (struct ctl_table *) de->data; 1432 if (!table || !table->proc_handler) 1433 goto out; 1434 error = -EPERM; 1435 op = (write ? 002 : 004); 1436 if (ctl_perm(table, op)) 1437 goto out; 1438 1439 /* careful: calling conventions are nasty here */ 1440 res = count; 1441 error = (*table->proc_handler)(table, write, file, 1442 buf, &res, ppos); 1443 if (!error) 1444 error = res; 1445 out: 1446 spin_lock(&sysctl_lock); 1447 unuse_table(de->set); 1448 } 1449 spin_unlock(&sysctl_lock); 1450 return error; 1451 } 1452 1453 static int proc_opensys(struct inode *inode, struct file *file) 1454 { 1455 if (file->f_mode & FMODE_WRITE) { 1456 /* 1457 * sysctl entries that are not writable, 1458 * are _NOT_ writable, capabilities or not. 1459 */ 1460 if (!(inode->i_mode & S_IWUSR)) 1461 return -EPERM; 1462 } 1463 1464 return 0; 1465 } 1466 1467 static ssize_t proc_readsys(struct file * file, char __user * buf, 1468 size_t count, loff_t *ppos) 1469 { 1470 return do_rw_proc(0, file, buf, count, ppos); 1471 } 1472 1473 static ssize_t proc_writesys(struct file * file, const char __user * buf, 1474 size_t count, loff_t *ppos) 1475 { 1476 return do_rw_proc(1, file, (char __user *) buf, count, ppos); 1477 } 1478 1479 /** 1480 * proc_dostring - read a string sysctl 1481 * @table: the sysctl table 1482 * @write: %TRUE if this is a write to the sysctl file 1483 * @filp: the file structure 1484 * @buffer: the user buffer 1485 * @lenp: the size of the user buffer 1486 * @ppos: file position 1487 * 1488 * Reads/writes a string from/to the user buffer. If the kernel 1489 * buffer provided is not large enough to hold the string, the 1490 * string is truncated. The copied string is %NULL-terminated. 1491 * If the string is being read by the user process, it is copied 1492 * and a newline '\n' is added. It is truncated if the buffer is 1493 * not large enough. 1494 * 1495 * Returns 0 on success. 1496 */ 1497 int proc_dostring(ctl_table *table, int write, struct file *filp, 1498 void __user *buffer, size_t *lenp, loff_t *ppos) 1499 { 1500 size_t len; 1501 char __user *p; 1502 char c; 1503 1504 if (!table->data || !table->maxlen || !*lenp || 1505 (*ppos && !write)) { 1506 *lenp = 0; 1507 return 0; 1508 } 1509 1510 if (write) { 1511 len = 0; 1512 p = buffer; 1513 while (len < *lenp) { 1514 if (get_user(c, p++)) 1515 return -EFAULT; 1516 if (c == 0 || c == '\n') 1517 break; 1518 len++; 1519 } 1520 if (len >= table->maxlen) 1521 len = table->maxlen-1; 1522 if(copy_from_user(table->data, buffer, len)) 1523 return -EFAULT; 1524 ((char *) table->data)[len] = 0; 1525 *ppos += *lenp; 1526 } else { 1527 len = strlen(table->data); 1528 if (len > table->maxlen) 1529 len = table->maxlen; 1530 if (len > *lenp) 1531 len = *lenp; 1532 if (len) 1533 if(copy_to_user(buffer, table->data, len)) 1534 return -EFAULT; 1535 if (len < *lenp) { 1536 if(put_user('\n', ((char __user *) buffer) + len)) 1537 return -EFAULT; 1538 len++; 1539 } 1540 *lenp = len; 1541 *ppos += len; 1542 } 1543 return 0; 1544 } 1545 1546 /* 1547 * Special case of dostring for the UTS structure. This has locks 1548 * to observe. Should this be in kernel/sys.c ???? 1549 */ 1550 1551 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 1552 void __user *buffer, size_t *lenp, loff_t *ppos) 1553 { 1554 int r; 1555 1556 if (!write) { 1557 down_read(&uts_sem); 1558 r=proc_dostring(table,0,filp,buffer,lenp, ppos); 1559 up_read(&uts_sem); 1560 } else { 1561 down_write(&uts_sem); 1562 r=proc_dostring(table,1,filp,buffer,lenp, ppos); 1563 up_write(&uts_sem); 1564 } 1565 return r; 1566 } 1567 1568 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 1569 int *valp, 1570 int write, void *data) 1571 { 1572 if (write) { 1573 *valp = *negp ? -*lvalp : *lvalp; 1574 } else { 1575 int val = *valp; 1576 if (val < 0) { 1577 *negp = -1; 1578 *lvalp = (unsigned long)-val; 1579 } else { 1580 *negp = 0; 1581 *lvalp = (unsigned long)val; 1582 } 1583 } 1584 return 0; 1585 } 1586 1587 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, 1588 void __user *buffer, size_t *lenp, loff_t *ppos, 1589 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 1590 int write, void *data), 1591 void *data) 1592 { 1593 #define TMPBUFLEN 21 1594 int *i, vleft, first=1, neg, val; 1595 unsigned long lval; 1596 size_t left, len; 1597 1598 char buf[TMPBUFLEN], *p; 1599 char __user *s = buffer; 1600 1601 if (!table->data || !table->maxlen || !*lenp || 1602 (*ppos && !write)) { 1603 *lenp = 0; 1604 return 0; 1605 } 1606 1607 i = (int *) table->data; 1608 vleft = table->maxlen / sizeof(*i); 1609 left = *lenp; 1610 1611 if (!conv) 1612 conv = do_proc_dointvec_conv; 1613 1614 for (; left && vleft--; i++, first=0) { 1615 if (write) { 1616 while (left) { 1617 char c; 1618 if (get_user(c, s)) 1619 return -EFAULT; 1620 if (!isspace(c)) 1621 break; 1622 left--; 1623 s++; 1624 } 1625 if (!left) 1626 break; 1627 neg = 0; 1628 len = left; 1629 if (len > sizeof(buf) - 1) 1630 len = sizeof(buf) - 1; 1631 if (copy_from_user(buf, s, len)) 1632 return -EFAULT; 1633 buf[len] = 0; 1634 p = buf; 1635 if (*p == '-' && left > 1) { 1636 neg = 1; 1637 left--, p++; 1638 } 1639 if (*p < '0' || *p > '9') 1640 break; 1641 1642 lval = simple_strtoul(p, &p, 0); 1643 1644 len = p-buf; 1645 if ((len < left) && *p && !isspace(*p)) 1646 break; 1647 if (neg) 1648 val = -val; 1649 s += len; 1650 left -= len; 1651 1652 if (conv(&neg, &lval, i, 1, data)) 1653 break; 1654 } else { 1655 p = buf; 1656 if (!first) 1657 *p++ = '\t'; 1658 1659 if (conv(&neg, &lval, i, 0, data)) 1660 break; 1661 1662 sprintf(p, "%s%lu", neg ? "-" : "", lval); 1663 len = strlen(buf); 1664 if (len > left) 1665 len = left; 1666 if(copy_to_user(s, buf, len)) 1667 return -EFAULT; 1668 left -= len; 1669 s += len; 1670 } 1671 } 1672 1673 if (!write && !first && left) { 1674 if(put_user('\n', s)) 1675 return -EFAULT; 1676 left--, s++; 1677 } 1678 if (write) { 1679 while (left) { 1680 char c; 1681 if (get_user(c, s++)) 1682 return -EFAULT; 1683 if (!isspace(c)) 1684 break; 1685 left--; 1686 } 1687 } 1688 if (write && first) 1689 return -EINVAL; 1690 *lenp -= left; 1691 *ppos += *lenp; 1692 return 0; 1693 #undef TMPBUFLEN 1694 } 1695 1696 /** 1697 * proc_dointvec - read a vector of integers 1698 * @table: the sysctl table 1699 * @write: %TRUE if this is a write to the sysctl file 1700 * @filp: the file structure 1701 * @buffer: the user buffer 1702 * @lenp: the size of the user buffer 1703 * @ppos: file position 1704 * 1705 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1706 * values from/to the user buffer, treated as an ASCII string. 1707 * 1708 * Returns 0 on success. 1709 */ 1710 int proc_dointvec(ctl_table *table, int write, struct file *filp, 1711 void __user *buffer, size_t *lenp, loff_t *ppos) 1712 { 1713 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 1714 NULL,NULL); 1715 } 1716 1717 #define OP_SET 0 1718 #define OP_AND 1 1719 #define OP_OR 2 1720 #define OP_MAX 3 1721 #define OP_MIN 4 1722 1723 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, 1724 int *valp, 1725 int write, void *data) 1726 { 1727 int op = *(int *)data; 1728 if (write) { 1729 int val = *negp ? -*lvalp : *lvalp; 1730 switch(op) { 1731 case OP_SET: *valp = val; break; 1732 case OP_AND: *valp &= val; break; 1733 case OP_OR: *valp |= val; break; 1734 case OP_MAX: if(*valp < val) 1735 *valp = val; 1736 break; 1737 case OP_MIN: if(*valp > val) 1738 *valp = val; 1739 break; 1740 } 1741 } else { 1742 int val = *valp; 1743 if (val < 0) { 1744 *negp = -1; 1745 *lvalp = (unsigned long)-val; 1746 } else { 1747 *negp = 0; 1748 *lvalp = (unsigned long)val; 1749 } 1750 } 1751 return 0; 1752 } 1753 1754 /* 1755 * init may raise the set. 1756 */ 1757 1758 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 1759 void __user *buffer, size_t *lenp, loff_t *ppos) 1760 { 1761 int op; 1762 1763 if (!capable(CAP_SYS_MODULE)) { 1764 return -EPERM; 1765 } 1766 1767 op = (current->pid == 1) ? OP_SET : OP_AND; 1768 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 1769 do_proc_dointvec_bset_conv,&op); 1770 } 1771 1772 struct do_proc_dointvec_minmax_conv_param { 1773 int *min; 1774 int *max; 1775 }; 1776 1777 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 1778 int *valp, 1779 int write, void *data) 1780 { 1781 struct do_proc_dointvec_minmax_conv_param *param = data; 1782 if (write) { 1783 int val = *negp ? -*lvalp : *lvalp; 1784 if ((param->min && *param->min > val) || 1785 (param->max && *param->max < val)) 1786 return -EINVAL; 1787 *valp = val; 1788 } else { 1789 int val = *valp; 1790 if (val < 0) { 1791 *negp = -1; 1792 *lvalp = (unsigned long)-val; 1793 } else { 1794 *negp = 0; 1795 *lvalp = (unsigned long)val; 1796 } 1797 } 1798 return 0; 1799 } 1800 1801 /** 1802 * proc_dointvec_minmax - read a vector of integers with min/max values 1803 * @table: the sysctl table 1804 * @write: %TRUE if this is a write to the sysctl file 1805 * @filp: the file structure 1806 * @buffer: the user buffer 1807 * @lenp: the size of the user buffer 1808 * @ppos: file position 1809 * 1810 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1811 * values from/to the user buffer, treated as an ASCII string. 1812 * 1813 * This routine will ensure the values are within the range specified by 1814 * table->extra1 (min) and table->extra2 (max). 1815 * 1816 * Returns 0 on success. 1817 */ 1818 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 1819 void __user *buffer, size_t *lenp, loff_t *ppos) 1820 { 1821 struct do_proc_dointvec_minmax_conv_param param = { 1822 .min = (int *) table->extra1, 1823 .max = (int *) table->extra2, 1824 }; 1825 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 1826 do_proc_dointvec_minmax_conv, ¶m); 1827 } 1828 1829 static int do_proc_doulongvec_minmax(ctl_table *table, int write, 1830 struct file *filp, 1831 void __user *buffer, 1832 size_t *lenp, loff_t *ppos, 1833 unsigned long convmul, 1834 unsigned long convdiv) 1835 { 1836 #define TMPBUFLEN 21 1837 unsigned long *i, *min, *max, val; 1838 int vleft, first=1, neg; 1839 size_t len, left; 1840 char buf[TMPBUFLEN], *p; 1841 char __user *s = buffer; 1842 1843 if (!table->data || !table->maxlen || !*lenp || 1844 (*ppos && !write)) { 1845 *lenp = 0; 1846 return 0; 1847 } 1848 1849 i = (unsigned long *) table->data; 1850 min = (unsigned long *) table->extra1; 1851 max = (unsigned long *) table->extra2; 1852 vleft = table->maxlen / sizeof(unsigned long); 1853 left = *lenp; 1854 1855 for (; left && vleft--; i++, min++, max++, first=0) { 1856 if (write) { 1857 while (left) { 1858 char c; 1859 if (get_user(c, s)) 1860 return -EFAULT; 1861 if (!isspace(c)) 1862 break; 1863 left--; 1864 s++; 1865 } 1866 if (!left) 1867 break; 1868 neg = 0; 1869 len = left; 1870 if (len > TMPBUFLEN-1) 1871 len = TMPBUFLEN-1; 1872 if (copy_from_user(buf, s, len)) 1873 return -EFAULT; 1874 buf[len] = 0; 1875 p = buf; 1876 if (*p == '-' && left > 1) { 1877 neg = 1; 1878 left--, p++; 1879 } 1880 if (*p < '0' || *p > '9') 1881 break; 1882 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 1883 len = p-buf; 1884 if ((len < left) && *p && !isspace(*p)) 1885 break; 1886 if (neg) 1887 val = -val; 1888 s += len; 1889 left -= len; 1890 1891 if(neg) 1892 continue; 1893 if ((min && val < *min) || (max && val > *max)) 1894 continue; 1895 *i = val; 1896 } else { 1897 p = buf; 1898 if (!first) 1899 *p++ = '\t'; 1900 sprintf(p, "%lu", convdiv * (*i) / convmul); 1901 len = strlen(buf); 1902 if (len > left) 1903 len = left; 1904 if(copy_to_user(s, buf, len)) 1905 return -EFAULT; 1906 left -= len; 1907 s += len; 1908 } 1909 } 1910 1911 if (!write && !first && left) { 1912 if(put_user('\n', s)) 1913 return -EFAULT; 1914 left--, s++; 1915 } 1916 if (write) { 1917 while (left) { 1918 char c; 1919 if (get_user(c, s++)) 1920 return -EFAULT; 1921 if (!isspace(c)) 1922 break; 1923 left--; 1924 } 1925 } 1926 if (write && first) 1927 return -EINVAL; 1928 *lenp -= left; 1929 *ppos += *lenp; 1930 return 0; 1931 #undef TMPBUFLEN 1932 } 1933 1934 /** 1935 * proc_doulongvec_minmax - read a vector of long integers with min/max values 1936 * @table: the sysctl table 1937 * @write: %TRUE if this is a write to the sysctl file 1938 * @filp: the file structure 1939 * @buffer: the user buffer 1940 * @lenp: the size of the user buffer 1941 * @ppos: file position 1942 * 1943 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 1944 * values from/to the user buffer, treated as an ASCII string. 1945 * 1946 * This routine will ensure the values are within the range specified by 1947 * table->extra1 (min) and table->extra2 (max). 1948 * 1949 * Returns 0 on success. 1950 */ 1951 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 1952 void __user *buffer, size_t *lenp, loff_t *ppos) 1953 { 1954 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 1955 } 1956 1957 /** 1958 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 1959 * @table: the sysctl table 1960 * @write: %TRUE if this is a write to the sysctl file 1961 * @filp: the file structure 1962 * @buffer: the user buffer 1963 * @lenp: the size of the user buffer 1964 * @ppos: file position 1965 * 1966 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 1967 * values from/to the user buffer, treated as an ASCII string. The values 1968 * are treated as milliseconds, and converted to jiffies when they are stored. 1969 * 1970 * This routine will ensure the values are within the range specified by 1971 * table->extra1 (min) and table->extra2 (max). 1972 * 1973 * Returns 0 on success. 1974 */ 1975 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 1976 struct file *filp, 1977 void __user *buffer, 1978 size_t *lenp, loff_t *ppos) 1979 { 1980 return do_proc_doulongvec_minmax(table, write, filp, buffer, 1981 lenp, ppos, HZ, 1000l); 1982 } 1983 1984 1985 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 1986 int *valp, 1987 int write, void *data) 1988 { 1989 if (write) { 1990 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 1991 } else { 1992 int val = *valp; 1993 unsigned long lval; 1994 if (val < 0) { 1995 *negp = -1; 1996 lval = (unsigned long)-val; 1997 } else { 1998 *negp = 0; 1999 lval = (unsigned long)val; 2000 } 2001 *lvalp = lval / HZ; 2002 } 2003 return 0; 2004 } 2005 2006 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2007 int *valp, 2008 int write, void *data) 2009 { 2010 if (write) { 2011 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2012 } else { 2013 int val = *valp; 2014 unsigned long lval; 2015 if (val < 0) { 2016 *negp = -1; 2017 lval = (unsigned long)-val; 2018 } else { 2019 *negp = 0; 2020 lval = (unsigned long)val; 2021 } 2022 *lvalp = jiffies_to_clock_t(lval); 2023 } 2024 return 0; 2025 } 2026 2027 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2028 int *valp, 2029 int write, void *data) 2030 { 2031 if (write) { 2032 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2033 } else { 2034 int val = *valp; 2035 unsigned long lval; 2036 if (val < 0) { 2037 *negp = -1; 2038 lval = (unsigned long)-val; 2039 } else { 2040 *negp = 0; 2041 lval = (unsigned long)val; 2042 } 2043 *lvalp = jiffies_to_msecs(lval); 2044 } 2045 return 0; 2046 } 2047 2048 /** 2049 * proc_dointvec_jiffies - read a vector of integers as seconds 2050 * @table: the sysctl table 2051 * @write: %TRUE if this is a write to the sysctl file 2052 * @filp: the file structure 2053 * @buffer: the user buffer 2054 * @lenp: the size of the user buffer 2055 * @ppos: file position 2056 * 2057 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2058 * values from/to the user buffer, treated as an ASCII string. 2059 * The values read are assumed to be in seconds, and are converted into 2060 * jiffies. 2061 * 2062 * Returns 0 on success. 2063 */ 2064 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2065 void __user *buffer, size_t *lenp, loff_t *ppos) 2066 { 2067 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2068 do_proc_dointvec_jiffies_conv,NULL); 2069 } 2070 2071 /** 2072 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2073 * @table: the sysctl table 2074 * @write: %TRUE if this is a write to the sysctl file 2075 * @filp: the file structure 2076 * @buffer: the user buffer 2077 * @lenp: the size of the user buffer 2078 * @ppos: pointer to the file position 2079 * 2080 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2081 * values from/to the user buffer, treated as an ASCII string. 2082 * The values read are assumed to be in 1/USER_HZ seconds, and 2083 * are converted into jiffies. 2084 * 2085 * Returns 0 on success. 2086 */ 2087 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2088 void __user *buffer, size_t *lenp, loff_t *ppos) 2089 { 2090 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2091 do_proc_dointvec_userhz_jiffies_conv,NULL); 2092 } 2093 2094 /** 2095 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2096 * @table: the sysctl table 2097 * @write: %TRUE if this is a write to the sysctl file 2098 * @filp: the file structure 2099 * @buffer: the user buffer 2100 * @lenp: the size of the user buffer 2101 * @ppos: file position 2102 * @ppos: the current position in the file 2103 * 2104 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2105 * values from/to the user buffer, treated as an ASCII string. 2106 * The values read are assumed to be in 1/1000 seconds, and 2107 * are converted into jiffies. 2108 * 2109 * Returns 0 on success. 2110 */ 2111 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2112 void __user *buffer, size_t *lenp, loff_t *ppos) 2113 { 2114 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2115 do_proc_dointvec_ms_jiffies_conv, NULL); 2116 } 2117 2118 #else /* CONFIG_PROC_FS */ 2119 2120 int proc_dostring(ctl_table *table, int write, struct file *filp, 2121 void __user *buffer, size_t *lenp, loff_t *ppos) 2122 { 2123 return -ENOSYS; 2124 } 2125 2126 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 2127 void __user *buffer, size_t *lenp, loff_t *ppos) 2128 { 2129 return -ENOSYS; 2130 } 2131 2132 int proc_dointvec(ctl_table *table, int write, struct file *filp, 2133 void __user *buffer, size_t *lenp, loff_t *ppos) 2134 { 2135 return -ENOSYS; 2136 } 2137 2138 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 2139 void __user *buffer, size_t *lenp, loff_t *ppos) 2140 { 2141 return -ENOSYS; 2142 } 2143 2144 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 2145 void __user *buffer, size_t *lenp, loff_t *ppos) 2146 { 2147 return -ENOSYS; 2148 } 2149 2150 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2151 void __user *buffer, size_t *lenp, loff_t *ppos) 2152 { 2153 return -ENOSYS; 2154 } 2155 2156 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2157 void __user *buffer, size_t *lenp, loff_t *ppos) 2158 { 2159 return -ENOSYS; 2160 } 2161 2162 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2163 void __user *buffer, size_t *lenp, loff_t *ppos) 2164 { 2165 return -ENOSYS; 2166 } 2167 2168 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2169 void __user *buffer, size_t *lenp, loff_t *ppos) 2170 { 2171 return -ENOSYS; 2172 } 2173 2174 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2175 struct file *filp, 2176 void __user *buffer, 2177 size_t *lenp, loff_t *ppos) 2178 { 2179 return -ENOSYS; 2180 } 2181 2182 2183 #endif /* CONFIG_PROC_FS */ 2184 2185 2186 /* 2187 * General sysctl support routines 2188 */ 2189 2190 /* The generic string strategy routine: */ 2191 int sysctl_string(ctl_table *table, int __user *name, int nlen, 2192 void __user *oldval, size_t __user *oldlenp, 2193 void __user *newval, size_t newlen, void **context) 2194 { 2195 size_t l, len; 2196 2197 if (!table->data || !table->maxlen) 2198 return -ENOTDIR; 2199 2200 if (oldval && oldlenp) { 2201 if (get_user(len, oldlenp)) 2202 return -EFAULT; 2203 if (len) { 2204 l = strlen(table->data); 2205 if (len > l) len = l; 2206 if (len >= table->maxlen) 2207 len = table->maxlen; 2208 if(copy_to_user(oldval, table->data, len)) 2209 return -EFAULT; 2210 if(put_user(0, ((char __user *) oldval) + len)) 2211 return -EFAULT; 2212 if(put_user(len, oldlenp)) 2213 return -EFAULT; 2214 } 2215 } 2216 if (newval && newlen) { 2217 len = newlen; 2218 if (len > table->maxlen) 2219 len = table->maxlen; 2220 if(copy_from_user(table->data, newval, len)) 2221 return -EFAULT; 2222 if (len == table->maxlen) 2223 len--; 2224 ((char *) table->data)[len] = 0; 2225 } 2226 return 0; 2227 } 2228 2229 /* 2230 * This function makes sure that all of the integers in the vector 2231 * are between the minimum and maximum values given in the arrays 2232 * table->extra1 and table->extra2, respectively. 2233 */ 2234 int sysctl_intvec(ctl_table *table, int __user *name, int nlen, 2235 void __user *oldval, size_t __user *oldlenp, 2236 void __user *newval, size_t newlen, void **context) 2237 { 2238 2239 if (newval && newlen) { 2240 int __user *vec = (int __user *) newval; 2241 int *min = (int *) table->extra1; 2242 int *max = (int *) table->extra2; 2243 size_t length; 2244 int i; 2245 2246 if (newlen % sizeof(int) != 0) 2247 return -EINVAL; 2248 2249 if (!table->extra1 && !table->extra2) 2250 return 0; 2251 2252 if (newlen > table->maxlen) 2253 newlen = table->maxlen; 2254 length = newlen / sizeof(int); 2255 2256 for (i = 0; i < length; i++) { 2257 int value; 2258 if (get_user(value, vec + i)) 2259 return -EFAULT; 2260 if (min && value < min[i]) 2261 return -EINVAL; 2262 if (max && value > max[i]) 2263 return -EINVAL; 2264 } 2265 } 2266 return 0; 2267 } 2268 2269 /* Strategy function to convert jiffies to seconds */ 2270 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, 2271 void __user *oldval, size_t __user *oldlenp, 2272 void __user *newval, size_t newlen, void **context) 2273 { 2274 if (oldval) { 2275 size_t olen; 2276 if (oldlenp) { 2277 if (get_user(olen, oldlenp)) 2278 return -EFAULT; 2279 if (olen!=sizeof(int)) 2280 return -EINVAL; 2281 } 2282 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) || 2283 (oldlenp && put_user(sizeof(int),oldlenp))) 2284 return -EFAULT; 2285 } 2286 if (newval && newlen) { 2287 int new; 2288 if (newlen != sizeof(int)) 2289 return -EINVAL; 2290 if (get_user(new, (int __user *)newval)) 2291 return -EFAULT; 2292 *(int *)(table->data) = new*HZ; 2293 } 2294 return 1; 2295 } 2296 2297 /* Strategy function to convert jiffies to seconds */ 2298 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, 2299 void __user *oldval, size_t __user *oldlenp, 2300 void __user *newval, size_t newlen, void **context) 2301 { 2302 if (oldval) { 2303 size_t olen; 2304 if (oldlenp) { 2305 if (get_user(olen, oldlenp)) 2306 return -EFAULT; 2307 if (olen!=sizeof(int)) 2308 return -EINVAL; 2309 } 2310 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) || 2311 (oldlenp && put_user(sizeof(int),oldlenp))) 2312 return -EFAULT; 2313 } 2314 if (newval && newlen) { 2315 int new; 2316 if (newlen != sizeof(int)) 2317 return -EINVAL; 2318 if (get_user(new, (int __user *)newval)) 2319 return -EFAULT; 2320 *(int *)(table->data) = msecs_to_jiffies(new); 2321 } 2322 return 1; 2323 } 2324 2325 #else /* CONFIG_SYSCTL */ 2326 2327 2328 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 2329 { 2330 return -ENOSYS; 2331 } 2332 2333 int sysctl_string(ctl_table *table, int __user *name, int nlen, 2334 void __user *oldval, size_t __user *oldlenp, 2335 void __user *newval, size_t newlen, void **context) 2336 { 2337 return -ENOSYS; 2338 } 2339 2340 int sysctl_intvec(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 return -ENOSYS; 2345 } 2346 2347 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, 2348 void __user *oldval, size_t __user *oldlenp, 2349 void __user *newval, size_t newlen, void **context) 2350 { 2351 return -ENOSYS; 2352 } 2353 2354 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, 2355 void __user *oldval, size_t __user *oldlenp, 2356 void __user *newval, size_t newlen, void **context) 2357 { 2358 return -ENOSYS; 2359 } 2360 2361 int proc_dostring(ctl_table *table, int write, struct file *filp, 2362 void __user *buffer, size_t *lenp, loff_t *ppos) 2363 { 2364 return -ENOSYS; 2365 } 2366 2367 int proc_dointvec(ctl_table *table, int write, struct file *filp, 2368 void __user *buffer, size_t *lenp, loff_t *ppos) 2369 { 2370 return -ENOSYS; 2371 } 2372 2373 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 2374 void __user *buffer, size_t *lenp, loff_t *ppos) 2375 { 2376 return -ENOSYS; 2377 } 2378 2379 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 2380 void __user *buffer, size_t *lenp, loff_t *ppos) 2381 { 2382 return -ENOSYS; 2383 } 2384 2385 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2386 void __user *buffer, size_t *lenp, loff_t *ppos) 2387 { 2388 return -ENOSYS; 2389 } 2390 2391 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2392 void __user *buffer, size_t *lenp, loff_t *ppos) 2393 { 2394 return -ENOSYS; 2395 } 2396 2397 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2398 void __user *buffer, size_t *lenp, loff_t *ppos) 2399 { 2400 return -ENOSYS; 2401 } 2402 2403 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2404 void __user *buffer, size_t *lenp, loff_t *ppos) 2405 { 2406 return -ENOSYS; 2407 } 2408 2409 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2410 struct file *filp, 2411 void __user *buffer, 2412 size_t *lenp, loff_t *ppos) 2413 { 2414 return -ENOSYS; 2415 } 2416 2417 struct ctl_table_header * register_sysctl_table(ctl_table * table, 2418 int insert_at_head) 2419 { 2420 return NULL; 2421 } 2422 2423 void unregister_sysctl_table(struct ctl_table_header * table) 2424 { 2425 } 2426 2427 #endif /* CONFIG_SYSCTL */ 2428 2429 /* 2430 * No sense putting this after each symbol definition, twice, 2431 * exception granted :-) 2432 */ 2433 EXPORT_SYMBOL(proc_dointvec); 2434 EXPORT_SYMBOL(proc_dointvec_jiffies); 2435 EXPORT_SYMBOL(proc_dointvec_minmax); 2436 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2437 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2438 EXPORT_SYMBOL(proc_dostring); 2439 EXPORT_SYMBOL(proc_doulongvec_minmax); 2440 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2441 EXPORT_SYMBOL(register_sysctl_table); 2442 EXPORT_SYMBOL(sysctl_intvec); 2443 EXPORT_SYMBOL(sysctl_jiffies); 2444 EXPORT_SYMBOL(sysctl_ms_jiffies); 2445 EXPORT_SYMBOL(sysctl_string); 2446 EXPORT_SYMBOL(unregister_sysctl_table); 2447