Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 34 | #include <linux/net.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Alan Cox | d6e7114 | 2005-06-23 00:09:43 -0700 | [diff] [blame] | 62 | extern int suid_dumpable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Martin Schwidefsky | 951f22d | 2005-07-27 11:44:57 -0700 | [diff] [blame] | 118 | extern int spin_retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Robert Love | 0399cb0 | 2005-07-13 12:38:18 -0400 | [diff] [blame] | 148 | #ifdef CONFIG_INOTIFY |
| 149 | extern ctl_table inotify_table[]; |
| 150 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 172 | static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | }, |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 223 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | }, |
Martin Schwidefsky | 951f22d | 2005-07-27 11:44:57 -0700 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Zach Brown | d55b5fd | 2005-11-07 00:59:31 -0800 | [diff] [blame] | 955 | .proc_handler = &proc_doulongvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Zach Brown | d55b5fd | 2005-11-07 00:59:31 -0800 | [diff] [blame] | 963 | .proc_handler = &proc_doulongvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | }, |
Robert Love | 0399cb0 | 2005-07-13 12:38:18 -0400 | [diff] [blame] | 965 | #ifdef CONFIG_INOTIFY |
| 966 | { |
| 967 | .ctl_name = FS_INOTIFY, |
| 968 | .procname = "inotify", |
| 969 | .mode = 0555, |
| 970 | .child = inotify_table, |
| 971 | }, |
| 972 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | #endif |
Alan Cox | d6e7114 | 2005-06-23 00:09:43 -0700 | [diff] [blame] | 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 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 } |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 991 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | |
| 993 | extern void init_irq_proc (void); |
| 994 | |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | void __init sysctl_init(void) |
| 1037 | { |
| 1038 | #ifdef CONFIG_PROC_FS |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1039 | register_proc_table(root_table, proc_sys_root, &root_table_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1048 | int error = -ENOTDIR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1057 | spin_lock(&sysctl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1063 | |
| 1064 | if (!use_table(head)) |
| 1065 | continue; |
| 1066 | |
| 1067 | spin_unlock(&sysctl_lock); |
| 1068 | |
| 1069 | error = parse_table(name, nlen, oldval, oldlenp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | newval, newlen, head->ctl_table, |
| 1071 | &context); |
Jesper Juhl | 5a6b454 | 2005-06-25 14:58:48 -0700 | [diff] [blame] | 1072 | kfree(context); |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1073 | |
| 1074 | spin_lock(&sysctl_lock); |
| 1075 | unuse_table(head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | if (error != -ENOTDIR) |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1077 | break; |
| 1078 | } while ((tmp = tmp->next) != &root_table_header.ctl_entry); |
| 1079 | spin_unlock(&sysctl_lock); |
| 1080 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1291 | tmp->used = 0; |
| 1292 | tmp->unregistering = NULL; |
| 1293 | spin_lock(&sysctl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1298 | spin_unlock(&sysctl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | #ifdef CONFIG_PROC_FS |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1300 | register_proc_table(table, proc_sys_root, tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1314 | might_sleep(); |
| 1315 | spin_lock(&sysctl_lock); |
| 1316 | start_unregistering(header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | #ifdef CONFIG_PROC_FS |
| 1318 | unregister_proc_table(header->ctl_table, proc_sys_root); |
| 1319 | #endif |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1320 | spin_unlock(&sysctl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1331 | static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1367 | de->set = set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1374 | register_proc_table(table->child, de, set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1419 | struct proc_dir_entry *de = PDE(file->f_dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | struct ctl_table *table; |
| 1421 | size_t res; |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 1422 | ssize_t error = -ENOTDIR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | |
Al Viro | 330d57f | 2005-11-04 10:18:40 +0000 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Randy Dunlap | 1e5d533 | 2005-11-07 01:01:06 -0800 | [diff] [blame] | 2078 | * @ppos: pointer to the file position |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 2101 | * @ppos: file position |
| 2102 | * @ppos: the current position in the file |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |