Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/sys.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | */ |
| 6 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include <linux/module.h> |
| 8 | #include <linux/mm.h> |
| 9 | #include <linux/utsname.h> |
| 10 | #include <linux/mman.h> |
| 11 | #include <linux/smp_lock.h> |
| 12 | #include <linux/notifier.h> |
| 13 | #include <linux/reboot.h> |
| 14 | #include <linux/prctl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/highuid.h> |
| 16 | #include <linux/fs.h> |
Ingo Molnar | 1d1c7dd | 2008-12-11 14:59:31 +0100 | [diff] [blame] | 17 | #include <linux/perf_counter.h> |
Daniel Walker | 3e88c55 | 2007-05-10 22:22:53 -0700 | [diff] [blame] | 18 | #include <linux/resource.h> |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 19 | #include <linux/kernel.h> |
| 20 | #include <linux/kexec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/workqueue.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 22 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/device.h> |
| 24 | #include <linux/key.h> |
| 25 | #include <linux/times.h> |
| 26 | #include <linux/posix-timers.h> |
| 27 | #include <linux/security.h> |
| 28 | #include <linux/dcookies.h> |
| 29 | #include <linux/suspend.h> |
| 30 | #include <linux/tty.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 31 | #include <linux/signal.h> |
Matt Helsley | 9f46080 | 2005-11-07 00:59:16 -0800 | [diff] [blame] | 32 | #include <linux/cn_proc.h> |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 33 | #include <linux/getcpu.h> |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 34 | #include <linux/task_io_accounting_ops.h> |
Andrea Arcangeli | 1d9d02f | 2007-07-15 23:41:32 -0700 | [diff] [blame] | 35 | #include <linux/seccomp.h> |
Mark Lord | 4047727 | 2007-10-01 01:20:10 -0700 | [diff] [blame] | 36 | #include <linux/cpu.h> |
Paul Mackerras | e3d5a27 | 2009-01-06 14:41:02 -0800 | [diff] [blame] | 37 | #include <linux/ptrace.h> |
Al Viro | 5ad4e53 | 2009-03-29 19:50:06 -0400 | [diff] [blame] | 38 | #include <linux/fs_struct.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #include <linux/compat.h> |
| 41 | #include <linux/syscalls.h> |
Keshavamurthy Anil S | 00d7c05 | 2005-12-12 00:37:33 -0800 | [diff] [blame] | 42 | #include <linux/kprobes.h> |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 43 | #include <linux/user_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | #include <asm/uaccess.h> |
| 46 | #include <asm/io.h> |
| 47 | #include <asm/unistd.h> |
| 48 | |
| 49 | #ifndef SET_UNALIGN_CTL |
| 50 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) |
| 51 | #endif |
| 52 | #ifndef GET_UNALIGN_CTL |
| 53 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) |
| 54 | #endif |
| 55 | #ifndef SET_FPEMU_CTL |
| 56 | # define SET_FPEMU_CTL(a,b) (-EINVAL) |
| 57 | #endif |
| 58 | #ifndef GET_FPEMU_CTL |
| 59 | # define GET_FPEMU_CTL(a,b) (-EINVAL) |
| 60 | #endif |
| 61 | #ifndef SET_FPEXC_CTL |
| 62 | # define SET_FPEXC_CTL(a,b) (-EINVAL) |
| 63 | #endif |
| 64 | #ifndef GET_FPEXC_CTL |
| 65 | # define GET_FPEXC_CTL(a,b) (-EINVAL) |
| 66 | #endif |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 67 | #ifndef GET_ENDIAN |
| 68 | # define GET_ENDIAN(a,b) (-EINVAL) |
| 69 | #endif |
| 70 | #ifndef SET_ENDIAN |
| 71 | # define SET_ENDIAN(a,b) (-EINVAL) |
| 72 | #endif |
Erik Bosman | 8fb402b | 2008-04-11 18:54:17 +0200 | [diff] [blame] | 73 | #ifndef GET_TSC_CTL |
| 74 | # define GET_TSC_CTL(a) (-EINVAL) |
| 75 | #endif |
| 76 | #ifndef SET_TSC_CTL |
| 77 | # define SET_TSC_CTL(a) (-EINVAL) |
| 78 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | /* |
| 81 | * this is where the system-wide overflow UID and GID are defined, for |
| 82 | * architectures that now have 32-bit UID/GID but didn't in the past |
| 83 | */ |
| 84 | |
| 85 | int overflowuid = DEFAULT_OVERFLOWUID; |
| 86 | int overflowgid = DEFAULT_OVERFLOWGID; |
| 87 | |
| 88 | #ifdef CONFIG_UID16 |
| 89 | EXPORT_SYMBOL(overflowuid); |
| 90 | EXPORT_SYMBOL(overflowgid); |
| 91 | #endif |
| 92 | |
| 93 | /* |
| 94 | * the same as above, but for filesystems which can only store a 16-bit |
| 95 | * UID and GID. as such, this is needed on all architectures |
| 96 | */ |
| 97 | |
| 98 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; |
| 99 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; |
| 100 | |
| 101 | EXPORT_SYMBOL(fs_overflowuid); |
| 102 | EXPORT_SYMBOL(fs_overflowgid); |
| 103 | |
| 104 | /* |
| 105 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes |
| 106 | */ |
| 107 | |
| 108 | int C_A_D = 1; |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 109 | struct pid *cad_pid; |
| 110 | EXPORT_SYMBOL(cad_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
| 112 | /* |
Rafael J. Wysocki | bd804eb | 2007-07-19 01:47:40 -0700 | [diff] [blame] | 113 | * If set, this is used for preparing the system to power off. |
| 114 | */ |
| 115 | |
| 116 | void (*pm_power_off_prepare)(void); |
Rafael J. Wysocki | bd804eb | 2007-07-19 01:47:40 -0700 | [diff] [blame] | 117 | |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 118 | /* |
| 119 | * set the priority of a task |
| 120 | * - the caller must hold the RCU read lock |
| 121 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
| 123 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 124 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | int no_nice; |
| 126 | |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 127 | if (pcred->uid != cred->euid && |
| 128 | pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | error = -EPERM; |
| 130 | goto out; |
| 131 | } |
Matt Mackall | e43379f | 2005-05-01 08:59:00 -0700 | [diff] [blame] | 132 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | error = -EACCES; |
| 134 | goto out; |
| 135 | } |
| 136 | no_nice = security_task_setnice(p, niceval); |
| 137 | if (no_nice) { |
| 138 | error = no_nice; |
| 139 | goto out; |
| 140 | } |
| 141 | if (error == -ESRCH) |
| 142 | error = 0; |
| 143 | set_user_nice(p, niceval); |
| 144 | out: |
| 145 | return error; |
| 146 | } |
| 147 | |
Heiko Carstens | 754fe8d | 2009-01-14 14:14:09 +0100 | [diff] [blame] | 148 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | { |
| 150 | struct task_struct *g, *p; |
| 151 | struct user_struct *user; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 152 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | int error = -EINVAL; |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 154 | struct pid *pgrp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Daniel Walker | 3e88c55 | 2007-05-10 22:22:53 -0700 | [diff] [blame] | 156 | if (which > PRIO_USER || which < PRIO_PROCESS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | goto out; |
| 158 | |
| 159 | /* normalize: avoid signed division (rounding problems) */ |
| 160 | error = -ESRCH; |
| 161 | if (niceval < -20) |
| 162 | niceval = -20; |
| 163 | if (niceval > 19) |
| 164 | niceval = 19; |
| 165 | |
| 166 | read_lock(&tasklist_lock); |
| 167 | switch (which) { |
| 168 | case PRIO_PROCESS: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 169 | if (who) |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 170 | p = find_task_by_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 171 | else |
| 172 | p = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | if (p) |
| 174 | error = set_one_prio(p, niceval, error); |
| 175 | break; |
| 176 | case PRIO_PGRP: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 177 | if (who) |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 178 | pgrp = find_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 179 | else |
| 180 | pgrp = task_pgrp(current); |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 181 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | error = set_one_prio(p, niceval, error); |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 183 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | break; |
| 185 | case PRIO_USER: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 186 | user = (struct user_struct *) cred->user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | if (!who) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 188 | who = cred->uid; |
| 189 | else if ((who != cred->uid) && |
| 190 | !(user = find_user(who))) |
| 191 | goto out_unlock; /* No processes for this user */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
| 193 | do_each_thread(g, p) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 194 | if (__task_cred(p)->uid == who) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | error = set_one_prio(p, niceval, error); |
| 196 | while_each_thread(g, p); |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 197 | if (who != cred->uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | free_uid(user); /* For find_user() */ |
| 199 | break; |
| 200 | } |
| 201 | out_unlock: |
| 202 | read_unlock(&tasklist_lock); |
| 203 | out: |
| 204 | return error; |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Ugh. To avoid negative return values, "getpriority()" will |
| 209 | * not return the normal nice-value, but a negated value that |
| 210 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) |
| 211 | * to stay compatible. |
| 212 | */ |
Heiko Carstens | 754fe8d | 2009-01-14 14:14:09 +0100 | [diff] [blame] | 213 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
| 215 | struct task_struct *g, *p; |
| 216 | struct user_struct *user; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 217 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | long niceval, retval = -ESRCH; |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 219 | struct pid *pgrp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
Daniel Walker | 3e88c55 | 2007-05-10 22:22:53 -0700 | [diff] [blame] | 221 | if (which > PRIO_USER || which < PRIO_PROCESS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | return -EINVAL; |
| 223 | |
| 224 | read_lock(&tasklist_lock); |
| 225 | switch (which) { |
| 226 | case PRIO_PROCESS: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 227 | if (who) |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 228 | p = find_task_by_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 229 | else |
| 230 | p = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | if (p) { |
| 232 | niceval = 20 - task_nice(p); |
| 233 | if (niceval > retval) |
| 234 | retval = niceval; |
| 235 | } |
| 236 | break; |
| 237 | case PRIO_PGRP: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 238 | if (who) |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 239 | pgrp = find_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 240 | else |
| 241 | pgrp = task_pgrp(current); |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 242 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | niceval = 20 - task_nice(p); |
| 244 | if (niceval > retval) |
| 245 | retval = niceval; |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 246 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | break; |
| 248 | case PRIO_USER: |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 249 | user = (struct user_struct *) cred->user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | if (!who) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 251 | who = cred->uid; |
| 252 | else if ((who != cred->uid) && |
| 253 | !(user = find_user(who))) |
| 254 | goto out_unlock; /* No processes for this user */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
| 256 | do_each_thread(g, p) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 257 | if (__task_cred(p)->uid == who) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | niceval = 20 - task_nice(p); |
| 259 | if (niceval > retval) |
| 260 | retval = niceval; |
| 261 | } |
| 262 | while_each_thread(g, p); |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 263 | if (who != cred->uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | free_uid(user); /* for find_user() */ |
| 265 | break; |
| 266 | } |
| 267 | out_unlock: |
| 268 | read_unlock(&tasklist_lock); |
| 269 | |
| 270 | return retval; |
| 271 | } |
| 272 | |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 273 | /** |
| 274 | * emergency_restart - reboot the system |
| 275 | * |
| 276 | * Without shutting down any hardware or taking any locks |
| 277 | * reboot the system. This is called when we know we are in |
| 278 | * trouble so this is our best effort to reboot. This is |
| 279 | * safe to call in interrupt context. |
| 280 | */ |
Eric W. Biederman | 7c90347 | 2005-07-26 11:29:55 -0600 | [diff] [blame] | 281 | void emergency_restart(void) |
| 282 | { |
| 283 | machine_emergency_restart(); |
| 284 | } |
| 285 | EXPORT_SYMBOL_GPL(emergency_restart); |
| 286 | |
Huang Ying | ca195b7 | 2008-08-15 00:40:24 -0700 | [diff] [blame] | 287 | void kernel_restart_prepare(char *cmd) |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 288 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 289 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 290 | system_state = SYSTEM_RESTART; |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 291 | device_shutdown(); |
Rafael J. Wysocki | 58b3b71 | 2007-07-26 16:29:55 +0200 | [diff] [blame] | 292 | sysdev_shutdown(); |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 293 | } |
Randy Dunlap | 1e5d533 | 2005-11-07 01:01:06 -0800 | [diff] [blame] | 294 | |
| 295 | /** |
| 296 | * kernel_restart - reboot the system |
| 297 | * @cmd: pointer to buffer containing command to execute for restart |
Randy Dunlap | b8887e6 | 2005-11-07 01:01:07 -0800 | [diff] [blame] | 298 | * or %NULL |
Randy Dunlap | 1e5d533 | 2005-11-07 01:01:06 -0800 | [diff] [blame] | 299 | * |
| 300 | * Shutdown everything and perform a clean reboot. |
| 301 | * This is not safe to call in interrupt context. |
| 302 | */ |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 303 | void kernel_restart(char *cmd) |
| 304 | { |
| 305 | kernel_restart_prepare(cmd); |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 306 | if (!cmd) |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 307 | printk(KERN_EMERG "Restarting system.\n"); |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 308 | else |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 309 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 310 | machine_restart(cmd); |
| 311 | } |
| 312 | EXPORT_SYMBOL_GPL(kernel_restart); |
| 313 | |
Adrian Bunk | 4ef7229 | 2008-02-04 22:30:06 -0800 | [diff] [blame] | 314 | static void kernel_shutdown_prepare(enum system_states state) |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 315 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 316 | blocking_notifier_call_chain(&reboot_notifier_list, |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 317 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
| 318 | system_state = state; |
| 319 | device_shutdown(); |
| 320 | } |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 321 | /** |
| 322 | * kernel_halt - halt the system |
| 323 | * |
| 324 | * Shutdown everything and perform a clean system halt. |
| 325 | */ |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 326 | void kernel_halt(void) |
| 327 | { |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 328 | kernel_shutdown_prepare(SYSTEM_HALT); |
Rafael J. Wysocki | 58b3b71 | 2007-07-26 16:29:55 +0200 | [diff] [blame] | 329 | sysdev_shutdown(); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 330 | printk(KERN_EMERG "System halted.\n"); |
| 331 | machine_halt(); |
| 332 | } |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 333 | |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 334 | EXPORT_SYMBOL_GPL(kernel_halt); |
| 335 | |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 336 | /** |
| 337 | * kernel_power_off - power_off the system |
| 338 | * |
| 339 | * Shutdown everything and perform a clean system power_off. |
| 340 | */ |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 341 | void kernel_power_off(void) |
| 342 | { |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 343 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
Rafael J. Wysocki | bd804eb | 2007-07-19 01:47:40 -0700 | [diff] [blame] | 344 | if (pm_power_off_prepare) |
| 345 | pm_power_off_prepare(); |
Mark Lord | 4047727 | 2007-10-01 01:20:10 -0700 | [diff] [blame] | 346 | disable_nonboot_cpus(); |
Rafael J. Wysocki | 58b3b71 | 2007-07-26 16:29:55 +0200 | [diff] [blame] | 347 | sysdev_shutdown(); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 348 | printk(KERN_EMERG "Power down.\n"); |
| 349 | machine_power_off(); |
| 350 | } |
| 351 | EXPORT_SYMBOL_GPL(kernel_power_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | /* |
| 353 | * Reboot system call: for obvious reasons only root may call it, |
| 354 | * and even root needs to set up some magic numbers in the registers |
| 355 | * so that some mistake won't make this reboot the whole machine. |
| 356 | * You can also set the meaning of the ctrl-alt-del-key here. |
| 357 | * |
| 358 | * reboot doesn't sync: do that yourself before calling this. |
| 359 | */ |
Heiko Carstens | 754fe8d | 2009-01-14 14:14:09 +0100 | [diff] [blame] | 360 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
| 361 | void __user *, arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | { |
| 363 | char buffer[256]; |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 364 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | /* We only trust the superuser with rebooting the system. */ |
| 367 | if (!capable(CAP_SYS_BOOT)) |
| 368 | return -EPERM; |
| 369 | |
| 370 | /* For safety, we require "magic" arguments. */ |
| 371 | if (magic1 != LINUX_REBOOT_MAGIC1 || |
| 372 | (magic2 != LINUX_REBOOT_MAGIC2 && |
| 373 | magic2 != LINUX_REBOOT_MAGIC2A && |
| 374 | magic2 != LINUX_REBOOT_MAGIC2B && |
| 375 | magic2 != LINUX_REBOOT_MAGIC2C)) |
| 376 | return -EINVAL; |
| 377 | |
Eric W. Biederman | 5e38291 | 2006-01-08 01:03:46 -0800 | [diff] [blame] | 378 | /* Instead of trying to make the power_off code look like |
| 379 | * halt when pm_power_off is not set do it the easy way. |
| 380 | */ |
| 381 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) |
| 382 | cmd = LINUX_REBOOT_CMD_HALT; |
| 383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | lock_kernel(); |
| 385 | switch (cmd) { |
| 386 | case LINUX_REBOOT_CMD_RESTART: |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 387 | kernel_restart(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | break; |
| 389 | |
| 390 | case LINUX_REBOOT_CMD_CAD_ON: |
| 391 | C_A_D = 1; |
| 392 | break; |
| 393 | |
| 394 | case LINUX_REBOOT_CMD_CAD_OFF: |
| 395 | C_A_D = 0; |
| 396 | break; |
| 397 | |
| 398 | case LINUX_REBOOT_CMD_HALT: |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 399 | kernel_halt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | unlock_kernel(); |
| 401 | do_exit(0); |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 402 | panic("cannot halt"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
| 404 | case LINUX_REBOOT_CMD_POWER_OFF: |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 405 | kernel_power_off(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | unlock_kernel(); |
| 407 | do_exit(0); |
| 408 | break; |
| 409 | |
| 410 | case LINUX_REBOOT_CMD_RESTART2: |
| 411 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { |
| 412 | unlock_kernel(); |
| 413 | return -EFAULT; |
| 414 | } |
| 415 | buffer[sizeof(buffer) - 1] = '\0'; |
| 416 | |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 417 | kernel_restart(buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | break; |
| 419 | |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 420 | #ifdef CONFIG_KEXEC |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 421 | case LINUX_REBOOT_CMD_KEXEC: |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 422 | ret = kernel_kexec(); |
| 423 | break; |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 424 | #endif |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 425 | |
Rafael J. Wysocki | b0cb1a1 | 2007-07-29 23:24:36 +0200 | [diff] [blame] | 426 | #ifdef CONFIG_HIBERNATION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 428 | ret = hibernate(); |
| 429 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | #endif |
| 431 | |
| 432 | default: |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 433 | ret = -EINVAL; |
| 434 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | } |
| 436 | unlock_kernel(); |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 437 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | } |
| 439 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 440 | static void deferred_cad(struct work_struct *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | { |
Eric W. Biederman | abcd9e5 | 2005-07-26 11:27:34 -0600 | [diff] [blame] | 442 | kernel_restart(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | /* |
| 446 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. |
| 447 | * As it's called within an interrupt, it may NOT sync: the only choice |
| 448 | * is whether to reboot at once, or just ignore the ctrl-alt-del. |
| 449 | */ |
| 450 | void ctrl_alt_del(void) |
| 451 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 452 | static DECLARE_WORK(cad_work, deferred_cad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
| 454 | if (C_A_D) |
| 455 | schedule_work(&cad_work); |
| 456 | else |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 457 | kill_cad_pid(SIGINT, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
| 459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | /* |
| 461 | * Unprivileged users may change the real gid to the effective gid |
| 462 | * or vice versa. (BSD-style) |
| 463 | * |
| 464 | * If you set the real gid at all, or set the effective gid to a value not |
| 465 | * equal to the real gid, then the saved gid is set to the new effective gid. |
| 466 | * |
| 467 | * This makes it possible for a setgid program to completely drop its |
| 468 | * privileges, which is often a useful assertion to make when you are doing |
| 469 | * a security audit over a program. |
| 470 | * |
| 471 | * The general idea is that a program which uses just setregid() will be |
| 472 | * 100% compatible with BSD. A program which uses just setgid() will be |
| 473 | * 100% compatible with POSIX with saved IDs. |
| 474 | * |
| 475 | * SMP: There are not races, the GIDs are checked only by filesystem |
| 476 | * operations (as far as semantic preservation is concerned). |
| 477 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 478 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 480 | const struct cred *old; |
| 481 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | int retval; |
| 483 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 484 | new = prepare_creds(); |
| 485 | if (!new) |
| 486 | return -ENOMEM; |
| 487 | old = current_cred(); |
| 488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); |
| 490 | if (retval) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 491 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 493 | retval = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | if (rgid != (gid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 495 | if (old->gid == rgid || |
| 496 | old->egid == rgid || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | capable(CAP_SETGID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 498 | new->gid = rgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 500 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | } |
| 502 | if (egid != (gid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 503 | if (old->gid == egid || |
| 504 | old->egid == egid || |
| 505 | old->sgid == egid || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | capable(CAP_SETGID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 507 | new->egid = egid; |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 508 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 509 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | if (rgid != (gid_t) -1 || |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 513 | (egid != (gid_t) -1 && egid != old->gid)) |
| 514 | new->sgid = new->egid; |
| 515 | new->fsgid = new->egid; |
| 516 | |
| 517 | return commit_creds(new); |
| 518 | |
| 519 | error: |
| 520 | abort_creds(new); |
| 521 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | /* |
| 525 | * setgid() is implemented like SysV w/ SAVED_IDS |
| 526 | * |
| 527 | * SMP: Same implicit races as above. |
| 528 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 529 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 531 | const struct cred *old; |
| 532 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | int retval; |
| 534 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 535 | new = prepare_creds(); |
| 536 | if (!new) |
| 537 | return -ENOMEM; |
| 538 | old = current_cred(); |
| 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); |
| 541 | if (retval) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 542 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 544 | retval = -EPERM; |
| 545 | if (capable(CAP_SETGID)) |
| 546 | new->gid = new->egid = new->sgid = new->fsgid = gid; |
| 547 | else if (gid == old->gid || gid == old->sgid) |
| 548 | new->egid = new->fsgid = gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 550 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 552 | return commit_creds(new); |
| 553 | |
| 554 | error: |
| 555 | abort_creds(new); |
| 556 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 558 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 559 | /* |
| 560 | * change the user struct in a credentials set to match the new UID |
| 561 | */ |
| 562 | static int set_user(struct cred *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | { |
| 564 | struct user_struct *new_user; |
| 565 | |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 566 | new_user = alloc_uid(current_user_ns(), new->uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | if (!new_user) |
| 568 | return -EAGAIN; |
| 569 | |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 570 | if (!task_can_switch_user(new_user, current)) { |
| 571 | free_uid(new_user); |
| 572 | return -EINVAL; |
| 573 | } |
| 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | if (atomic_read(&new_user->processes) >= |
| 576 | current->signal->rlim[RLIMIT_NPROC].rlim_cur && |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 577 | new_user != INIT_USER) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | free_uid(new_user); |
| 579 | return -EAGAIN; |
| 580 | } |
| 581 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 582 | free_uid(new->user); |
| 583 | new->user = new_user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * Unprivileged users may change the real uid to the effective uid |
| 589 | * or vice versa. (BSD-style) |
| 590 | * |
| 591 | * If you set the real uid at all, or set the effective uid to a value not |
| 592 | * equal to the real uid, then the saved uid is set to the new effective uid. |
| 593 | * |
| 594 | * This makes it possible for a setuid program to completely drop its |
| 595 | * privileges, which is often a useful assertion to make when you are doing |
| 596 | * a security audit over a program. |
| 597 | * |
| 598 | * The general idea is that a program which uses just setreuid() will be |
| 599 | * 100% compatible with BSD. A program which uses just setuid() will be |
| 600 | * 100% compatible with POSIX with saved IDs. |
| 601 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 602 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 604 | const struct cred *old; |
| 605 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | int retval; |
| 607 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 608 | new = prepare_creds(); |
| 609 | if (!new) |
| 610 | return -ENOMEM; |
| 611 | old = current_cred(); |
| 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); |
| 614 | if (retval) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 615 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 617 | retval = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | if (ruid != (uid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 619 | new->uid = ruid; |
| 620 | if (old->uid != ruid && |
| 621 | old->euid != ruid && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | !capable(CAP_SETUID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 623 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | } |
| 625 | |
| 626 | if (euid != (uid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 627 | new->euid = euid; |
| 628 | if (old->uid != euid && |
| 629 | old->euid != euid && |
| 630 | old->suid != euid && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | !capable(CAP_SETUID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 632 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
| 634 | |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 635 | if (new->uid != old->uid) { |
| 636 | retval = set_user(new); |
| 637 | if (retval < 0) |
| 638 | goto error; |
| 639 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | if (ruid != (uid_t) -1 || |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 641 | (euid != (uid_t) -1 && euid != old->uid)) |
| 642 | new->suid = new->euid; |
| 643 | new->fsuid = new->euid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 645 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
| 646 | if (retval < 0) |
| 647 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 649 | return commit_creds(new); |
| 650 | |
| 651 | error: |
| 652 | abort_creds(new); |
| 653 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
| 656 | /* |
| 657 | * setuid() is implemented like SysV with SAVED_IDS |
| 658 | * |
| 659 | * Note that SAVED_ID's is deficient in that a setuid root program |
| 660 | * like sendmail, for example, cannot set its uid to be a normal |
| 661 | * user and then switch back, because if you're root, setuid() sets |
| 662 | * the saved uid too. If you don't like this, blame the bright people |
| 663 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() |
| 664 | * will allow a root program to temporarily drop privileges and be able to |
| 665 | * regain them by swapping the real and effective uid. |
| 666 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 667 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 669 | const struct cred *old; |
| 670 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | int retval; |
| 672 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 673 | new = prepare_creds(); |
| 674 | if (!new) |
| 675 | return -ENOMEM; |
| 676 | old = current_cred(); |
| 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); |
| 679 | if (retval) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 680 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 682 | retval = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | if (capable(CAP_SETUID)) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 684 | new->suid = new->uid = uid; |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 685 | if (uid != old->uid) { |
| 686 | retval = set_user(new); |
| 687 | if (retval < 0) |
| 688 | goto error; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 689 | } |
| 690 | } else if (uid != old->uid && uid != new->suid) { |
| 691 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 694 | new->fsuid = new->euid = uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 696 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); |
| 697 | if (retval < 0) |
| 698 | goto error; |
| 699 | |
| 700 | return commit_creds(new); |
| 701 | |
| 702 | error: |
| 703 | abort_creds(new); |
| 704 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
| 706 | |
| 707 | |
| 708 | /* |
| 709 | * This function implements a generic ability to update ruid, euid, |
| 710 | * and suid. This allows you to implement the 4.4 compatible seteuid(). |
| 711 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 712 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 714 | const struct cred *old; |
| 715 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | int retval; |
| 717 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 718 | new = prepare_creds(); |
| 719 | if (!new) |
| 720 | return -ENOMEM; |
| 721 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); |
| 723 | if (retval) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 724 | goto error; |
| 725 | old = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 727 | retval = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | if (!capable(CAP_SETUID)) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 729 | if (ruid != (uid_t) -1 && ruid != old->uid && |
| 730 | ruid != old->euid && ruid != old->suid) |
| 731 | goto error; |
| 732 | if (euid != (uid_t) -1 && euid != old->uid && |
| 733 | euid != old->euid && euid != old->suid) |
| 734 | goto error; |
| 735 | if (suid != (uid_t) -1 && suid != old->uid && |
| 736 | suid != old->euid && suid != old->suid) |
| 737 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | if (ruid != (uid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 741 | new->uid = ruid; |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 742 | if (ruid != old->uid) { |
| 743 | retval = set_user(new); |
| 744 | if (retval < 0) |
| 745 | goto error; |
| 746 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 748 | if (euid != (uid_t) -1) |
| 749 | new->euid = euid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | if (suid != (uid_t) -1) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 751 | new->suid = suid; |
| 752 | new->fsuid = new->euid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 754 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
| 755 | if (retval < 0) |
| 756 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 758 | return commit_creds(new); |
| 759 | |
| 760 | error: |
| 761 | abort_creds(new); |
| 762 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | } |
| 764 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 765 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 767 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | int retval; |
| 769 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 770 | if (!(retval = put_user(cred->uid, ruid)) && |
| 771 | !(retval = put_user(cred->euid, euid))) |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 772 | retval = put_user(cred->suid, suid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
| 774 | return retval; |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * Same as above, but for rgid, egid, sgid. |
| 779 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 780 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 782 | const struct cred *old; |
| 783 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | int retval; |
| 785 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 786 | new = prepare_creds(); |
| 787 | if (!new) |
| 788 | return -ENOMEM; |
| 789 | old = current_cred(); |
| 790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); |
| 792 | if (retval) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 793 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 795 | retval = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | if (!capable(CAP_SETGID)) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 797 | if (rgid != (gid_t) -1 && rgid != old->gid && |
| 798 | rgid != old->egid && rgid != old->sgid) |
| 799 | goto error; |
| 800 | if (egid != (gid_t) -1 && egid != old->gid && |
| 801 | egid != old->egid && egid != old->sgid) |
| 802 | goto error; |
| 803 | if (sgid != (gid_t) -1 && sgid != old->gid && |
| 804 | sgid != old->egid && sgid != old->sgid) |
| 805 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 808 | if (rgid != (gid_t) -1) |
| 809 | new->gid = rgid; |
| 810 | if (egid != (gid_t) -1) |
| 811 | new->egid = egid; |
| 812 | if (sgid != (gid_t) -1) |
| 813 | new->sgid = sgid; |
| 814 | new->fsgid = new->egid; |
| 815 | |
| 816 | return commit_creds(new); |
| 817 | |
| 818 | error: |
| 819 | abort_creds(new); |
| 820 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | } |
| 822 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 823 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 825 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | int retval; |
| 827 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 828 | if (!(retval = put_user(cred->gid, rgid)) && |
| 829 | !(retval = put_user(cred->egid, egid))) |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 830 | retval = put_user(cred->sgid, sgid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
| 832 | return retval; |
| 833 | } |
| 834 | |
| 835 | |
| 836 | /* |
| 837 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This |
| 838 | * is used for "access()" and for the NFS daemon (letting nfsd stay at |
| 839 | * whatever uid it wants to). It normally shadows "euid", except when |
| 840 | * explicitly set by setfsuid() or for access.. |
| 841 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 842 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 844 | const struct cred *old; |
| 845 | struct cred *new; |
| 846 | uid_t old_fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 848 | new = prepare_creds(); |
| 849 | if (!new) |
| 850 | return current_fsuid(); |
| 851 | old = current_cred(); |
| 852 | old_fsuid = old->fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 854 | if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS) < 0) |
| 855 | goto error; |
| 856 | |
| 857 | if (uid == old->uid || uid == old->euid || |
| 858 | uid == old->suid || uid == old->fsuid || |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 859 | capable(CAP_SETUID)) { |
| 860 | if (uid != old_fsuid) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 861 | new->fsuid = uid; |
| 862 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) |
| 863 | goto change_okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | } |
| 866 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 867 | error: |
| 868 | abort_creds(new); |
| 869 | return old_fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 871 | change_okay: |
| 872 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | return old_fsuid; |
| 874 | } |
| 875 | |
| 876 | /* |
John Anthony Kazos Jr | f42df9e | 2007-05-09 08:23:08 +0200 | [diff] [blame] | 877 | * Samma på svenska.. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 879 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 881 | const struct cred *old; |
| 882 | struct cred *new; |
| 883 | gid_t old_fsgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 885 | new = prepare_creds(); |
| 886 | if (!new) |
| 887 | return current_fsgid(); |
| 888 | old = current_cred(); |
| 889 | old_fsgid = old->fsgid; |
| 890 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 892 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 894 | if (gid == old->gid || gid == old->egid || |
| 895 | gid == old->sgid || gid == old->fsgid || |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 896 | capable(CAP_SETGID)) { |
| 897 | if (gid != old_fsgid) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 898 | new->fsgid = gid; |
| 899 | goto change_okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 902 | |
| 903 | error: |
| 904 | abort_creds(new); |
| 905 | return old_fsgid; |
| 906 | |
| 907 | change_okay: |
| 908 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | return old_fsgid; |
| 910 | } |
| 911 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 912 | void do_sys_times(struct tms *tms) |
| 913 | { |
| 914 | struct task_cputime cputime; |
| 915 | cputime_t cutime, cstime; |
| 916 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 917 | thread_group_cputime(current, &cputime); |
Oleg Nesterov | 2b5fe6d | 2008-11-17 15:40:08 +0100 | [diff] [blame] | 918 | spin_lock_irq(¤t->sighand->siglock); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 919 | cutime = current->signal->cutime; |
| 920 | cstime = current->signal->cstime; |
| 921 | spin_unlock_irq(¤t->sighand->siglock); |
| 922 | tms->tms_utime = cputime_to_clock_t(cputime.utime); |
| 923 | tms->tms_stime = cputime_to_clock_t(cputime.stime); |
| 924 | tms->tms_cutime = cputime_to_clock_t(cutime); |
| 925 | tms->tms_cstime = cputime_to_clock_t(cstime); |
| 926 | } |
| 927 | |
Heiko Carstens | 58fd3aa | 2009-01-14 14:14:03 +0100 | [diff] [blame] | 928 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | if (tbuf) { |
| 931 | struct tms tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 933 | do_sys_times(&tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
| 935 | return -EFAULT; |
| 936 | } |
Paul Mackerras | e3d5a27 | 2009-01-06 14:41:02 -0800 | [diff] [blame] | 937 | force_successful_syscall_return(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
| 939 | } |
| 940 | |
| 941 | /* |
| 942 | * This needs some heavy checking ... |
| 943 | * I just haven't the stomach for it. I also don't fully |
| 944 | * understand sessions/pgrp etc. Let somebody who does explain it. |
| 945 | * |
| 946 | * OK, I think I have the protection semantics right.... this is really |
| 947 | * only important on a multi-user system anyway, to make sure one user |
| 948 | * can't send a signal to a process owned by another. -TYT, 12/12/91 |
| 949 | * |
| 950 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. |
| 951 | * LBT 04.03.94 |
| 952 | */ |
Heiko Carstens | b290ebe | 2009-01-14 14:14:06 +0100 | [diff] [blame] | 953 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | { |
| 955 | struct task_struct *p; |
Oleg Nesterov | ee0acf9 | 2006-01-08 01:03:53 -0800 | [diff] [blame] | 956 | struct task_struct *group_leader = current->group_leader; |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 957 | struct pid *pgrp; |
| 958 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
| 960 | if (!pid) |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 961 | pid = task_pid_vnr(group_leader); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | if (!pgid) |
| 963 | pgid = pid; |
| 964 | if (pgid < 0) |
| 965 | return -EINVAL; |
| 966 | |
| 967 | /* From this point forward we keep holding onto the tasklist lock |
| 968 | * so that our parent does not change from under us. -DaveM |
| 969 | */ |
| 970 | write_lock_irq(&tasklist_lock); |
| 971 | |
| 972 | err = -ESRCH; |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 973 | p = find_task_by_vpid(pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | if (!p) |
| 975 | goto out; |
| 976 | |
| 977 | err = -EINVAL; |
| 978 | if (!thread_group_leader(p)) |
| 979 | goto out; |
| 980 | |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 981 | if (same_thread_group(p->real_parent, group_leader)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | err = -EPERM; |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 983 | if (task_session(p) != task_session(group_leader)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | goto out; |
| 985 | err = -EACCES; |
| 986 | if (p->did_exec) |
| 987 | goto out; |
| 988 | } else { |
| 989 | err = -ESRCH; |
Oleg Nesterov | ee0acf9 | 2006-01-08 01:03:53 -0800 | [diff] [blame] | 990 | if (p != group_leader) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | goto out; |
| 992 | } |
| 993 | |
| 994 | err = -EPERM; |
| 995 | if (p->signal->leader) |
| 996 | goto out; |
| 997 | |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 998 | pgrp = task_pid(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | if (pgid != pid) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1000 | struct task_struct *g; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1002 | pgrp = find_vpid(pgid); |
| 1003 | g = pid_task(pgrp, PIDTYPE_PGID); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 1004 | if (!g || task_session(g) != task_session(group_leader)) |
Oleg Nesterov | f020bc4 | 2006-12-08 02:38:02 -0800 | [diff] [blame] | 1005 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | } |
| 1007 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | err = security_task_setpgid(p, pgid); |
| 1009 | if (err) |
| 1010 | goto out; |
| 1011 | |
Oleg Nesterov | 1b0f7ff | 2009-04-02 16:58:39 -0700 | [diff] [blame] | 1012 | if (task_pgrp(p) != pgrp) |
Oleg Nesterov | 83beaf3 | 2008-04-30 00:54:27 -0700 | [diff] [blame] | 1013 | change_pid(p, PIDTYPE_PGID, pgrp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
| 1015 | err = 0; |
| 1016 | out: |
| 1017 | /* All paths lead to here, thus we are safe. -DaveM */ |
| 1018 | write_unlock_irq(&tasklist_lock); |
| 1019 | return err; |
| 1020 | } |
| 1021 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 1022 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | { |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1024 | struct task_struct *p; |
| 1025 | struct pid *grp; |
| 1026 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1028 | rcu_read_lock(); |
| 1029 | if (!pid) |
| 1030 | grp = task_pgrp(current); |
| 1031 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | retval = -ESRCH; |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1033 | p = find_task_by_vpid(pid); |
| 1034 | if (!p) |
| 1035 | goto out; |
| 1036 | grp = task_pgrp(p); |
| 1037 | if (!grp) |
| 1038 | goto out; |
| 1039 | |
| 1040 | retval = security_task_getpgid(p); |
| 1041 | if (retval) |
| 1042 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | } |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1044 | retval = pid_vnr(grp); |
| 1045 | out: |
| 1046 | rcu_read_unlock(); |
| 1047 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | } |
| 1049 | |
| 1050 | #ifdef __ARCH_WANT_SYS_GETPGRP |
| 1051 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 1052 | SYSCALL_DEFINE0(getpgrp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | { |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1054 | return sys_getpgid(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | } |
| 1056 | |
| 1057 | #endif |
| 1058 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 1059 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | { |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1061 | struct task_struct *p; |
| 1062 | struct pid *sid; |
| 1063 | int retval; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1064 | |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1065 | rcu_read_lock(); |
| 1066 | if (!pid) |
| 1067 | sid = task_session(current); |
| 1068 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | retval = -ESRCH; |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1070 | p = find_task_by_vpid(pid); |
| 1071 | if (!p) |
| 1072 | goto out; |
| 1073 | sid = task_session(p); |
| 1074 | if (!sid) |
| 1075 | goto out; |
| 1076 | |
| 1077 | retval = security_task_getsid(p); |
| 1078 | if (retval) |
| 1079 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1081 | retval = pid_vnr(sid); |
| 1082 | out: |
| 1083 | rcu_read_unlock(); |
| 1084 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | } |
| 1086 | |
Heiko Carstens | b290ebe | 2009-01-14 14:14:06 +0100 | [diff] [blame] | 1087 | SYSCALL_DEFINE0(setsid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | { |
Oren Laadan | e19f247 | 2006-01-08 01:03:58 -0800 | [diff] [blame] | 1089 | struct task_struct *group_leader = current->group_leader; |
Oleg Nesterov | e4cc0a9 | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1090 | struct pid *sid = task_pid(group_leader); |
| 1091 | pid_t session = pid_vnr(sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | int err = -EPERM; |
| 1093 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | write_lock_irq(&tasklist_lock); |
Eric W. Biederman | 390e2ff | 2006-03-31 02:31:33 -0800 | [diff] [blame] | 1095 | /* Fail if I am already a session leader */ |
| 1096 | if (group_leader->signal->leader) |
| 1097 | goto out; |
| 1098 | |
Oleg Nesterov | 430c623 | 2008-02-08 04:19:11 -0800 | [diff] [blame] | 1099 | /* Fail if a process group id already exists that equals the |
| 1100 | * proposed session id. |
Eric W. Biederman | 390e2ff | 2006-03-31 02:31:33 -0800 | [diff] [blame] | 1101 | */ |
Oleg Nesterov | 6806aac | 2008-02-08 04:19:12 -0800 | [diff] [blame] | 1102 | if (pid_task(sid, PIDTYPE_PGID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | goto out; |
| 1104 | |
Oren Laadan | e19f247 | 2006-01-08 01:03:58 -0800 | [diff] [blame] | 1105 | group_leader->signal->leader = 1; |
Oleg Nesterov | 8520d7c | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1106 | __set_special_pids(sid); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 1107 | |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 1108 | proc_clear_tty(group_leader); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 1109 | |
Oleg Nesterov | e4cc0a9 | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1110 | err = session; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | out: |
| 1112 | write_unlock_irq(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | return err; |
| 1114 | } |
| 1115 | |
| 1116 | /* |
| 1117 | * Supplementary group IDs |
| 1118 | */ |
| 1119 | |
| 1120 | /* init to 2 - one for init_task, one to ensure it is never freed */ |
| 1121 | struct group_info init_groups = { .usage = ATOMIC_INIT(2) }; |
| 1122 | |
| 1123 | struct group_info *groups_alloc(int gidsetsize) |
| 1124 | { |
| 1125 | struct group_info *group_info; |
| 1126 | int nblocks; |
| 1127 | int i; |
| 1128 | |
| 1129 | nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK; |
| 1130 | /* Make sure we always allocate at least one indirect block pointer */ |
| 1131 | nblocks = nblocks ? : 1; |
| 1132 | group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER); |
| 1133 | if (!group_info) |
| 1134 | return NULL; |
| 1135 | group_info->ngroups = gidsetsize; |
| 1136 | group_info->nblocks = nblocks; |
| 1137 | atomic_set(&group_info->usage, 1); |
| 1138 | |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 1139 | if (gidsetsize <= NGROUPS_SMALL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | group_info->blocks[0] = group_info->small_block; |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 1141 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | for (i = 0; i < nblocks; i++) { |
| 1143 | gid_t *b; |
| 1144 | b = (void *)__get_free_page(GFP_USER); |
| 1145 | if (!b) |
| 1146 | goto out_undo_partial_alloc; |
| 1147 | group_info->blocks[i] = b; |
| 1148 | } |
| 1149 | } |
| 1150 | return group_info; |
| 1151 | |
| 1152 | out_undo_partial_alloc: |
| 1153 | while (--i >= 0) { |
| 1154 | free_page((unsigned long)group_info->blocks[i]); |
| 1155 | } |
| 1156 | kfree(group_info); |
| 1157 | return NULL; |
| 1158 | } |
| 1159 | |
| 1160 | EXPORT_SYMBOL(groups_alloc); |
| 1161 | |
| 1162 | void groups_free(struct group_info *group_info) |
| 1163 | { |
| 1164 | if (group_info->blocks[0] != group_info->small_block) { |
| 1165 | int i; |
| 1166 | for (i = 0; i < group_info->nblocks; i++) |
| 1167 | free_page((unsigned long)group_info->blocks[i]); |
| 1168 | } |
| 1169 | kfree(group_info); |
| 1170 | } |
| 1171 | |
| 1172 | EXPORT_SYMBOL(groups_free); |
| 1173 | |
| 1174 | /* export the group_info to a user-space array */ |
| 1175 | static int groups_to_user(gid_t __user *grouplist, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1176 | const struct group_info *group_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | { |
| 1178 | int i; |
Eric Dumazet | 1bf4734 | 2008-02-06 01:37:56 -0800 | [diff] [blame] | 1179 | unsigned int count = group_info->ngroups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | |
| 1181 | for (i = 0; i < group_info->nblocks; i++) { |
Eric Dumazet | 1bf4734 | 2008-02-06 01:37:56 -0800 | [diff] [blame] | 1182 | unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); |
| 1183 | unsigned int len = cp_count * sizeof(*grouplist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | |
Eric Dumazet | 1bf4734 | 2008-02-06 01:37:56 -0800 | [diff] [blame] | 1185 | if (copy_to_user(grouplist, group_info->blocks[i], len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | return -EFAULT; |
| 1187 | |
Eric Dumazet | 1bf4734 | 2008-02-06 01:37:56 -0800 | [diff] [blame] | 1188 | grouplist += NGROUPS_PER_BLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | count -= cp_count; |
| 1190 | } |
| 1191 | return 0; |
| 1192 | } |
| 1193 | |
| 1194 | /* fill a group_info from a user-space array - it must be allocated already */ |
| 1195 | static int groups_from_user(struct group_info *group_info, |
| 1196 | gid_t __user *grouplist) |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 1197 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | int i; |
Eric Dumazet | 1bf4734 | 2008-02-06 01:37:56 -0800 | [diff] [blame] | 1199 | unsigned int count = group_info->ngroups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | |
| 1201 | for (i = 0; i < group_info->nblocks; i++) { |
Eric Dumazet | 1bf4734 | 2008-02-06 01:37:56 -0800 | [diff] [blame] | 1202 | unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); |
| 1203 | unsigned int len = cp_count * sizeof(*grouplist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | |
Eric Dumazet | 1bf4734 | 2008-02-06 01:37:56 -0800 | [diff] [blame] | 1205 | if (copy_from_user(group_info->blocks[i], grouplist, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | return -EFAULT; |
| 1207 | |
Eric Dumazet | 1bf4734 | 2008-02-06 01:37:56 -0800 | [diff] [blame] | 1208 | grouplist += NGROUPS_PER_BLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | count -= cp_count; |
| 1210 | } |
| 1211 | return 0; |
| 1212 | } |
| 1213 | |
Domen Puncer | ebe8b54 | 2005-05-05 16:16:19 -0700 | [diff] [blame] | 1214 | /* a simple Shell sort */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | static void groups_sort(struct group_info *group_info) |
| 1216 | { |
| 1217 | int base, max, stride; |
| 1218 | int gidsetsize = group_info->ngroups; |
| 1219 | |
| 1220 | for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1) |
| 1221 | ; /* nothing */ |
| 1222 | stride /= 3; |
| 1223 | |
| 1224 | while (stride) { |
| 1225 | max = gidsetsize - stride; |
| 1226 | for (base = 0; base < max; base++) { |
| 1227 | int left = base; |
| 1228 | int right = left + stride; |
| 1229 | gid_t tmp = GROUP_AT(group_info, right); |
| 1230 | |
| 1231 | while (left >= 0 && GROUP_AT(group_info, left) > tmp) { |
| 1232 | GROUP_AT(group_info, right) = |
| 1233 | GROUP_AT(group_info, left); |
| 1234 | right = left; |
| 1235 | left -= stride; |
| 1236 | } |
| 1237 | GROUP_AT(group_info, right) = tmp; |
| 1238 | } |
| 1239 | stride /= 3; |
| 1240 | } |
| 1241 | } |
| 1242 | |
| 1243 | /* a simple bsearch */ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1244 | int groups_search(const struct group_info *group_info, gid_t grp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | { |
Eric Dumazet | d74beb9 | 2006-03-25 03:08:19 -0800 | [diff] [blame] | 1246 | unsigned int left, right; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | |
| 1248 | if (!group_info) |
| 1249 | return 0; |
| 1250 | |
| 1251 | left = 0; |
| 1252 | right = group_info->ngroups; |
| 1253 | while (left < right) { |
Eric Dumazet | d74beb9 | 2006-03-25 03:08:19 -0800 | [diff] [blame] | 1254 | unsigned int mid = (left+right)/2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | int cmp = grp - GROUP_AT(group_info, mid); |
| 1256 | if (cmp > 0) |
| 1257 | left = mid + 1; |
| 1258 | else if (cmp < 0) |
| 1259 | right = mid; |
| 1260 | else |
| 1261 | return 1; |
| 1262 | } |
| 1263 | return 0; |
| 1264 | } |
| 1265 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1266 | /** |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1267 | * set_groups - Change a group subscription in a set of credentials |
| 1268 | * @new: The newly prepared set of credentials to alter |
| 1269 | * @group_info: The group list to install |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1270 | * |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1271 | * Validate a group subscription and, if valid, insert it into a set |
| 1272 | * of credentials. |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1273 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1274 | int set_groups(struct cred *new, struct group_info *group_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | { |
| 1276 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | |
| 1278 | retval = security_task_setgroups(group_info); |
| 1279 | if (retval) |
| 1280 | return retval; |
| 1281 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1282 | put_group_info(new->group_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | groups_sort(group_info); |
| 1284 | get_group_info(group_info); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1285 | new->group_info = group_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | return 0; |
| 1287 | } |
| 1288 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1289 | EXPORT_SYMBOL(set_groups); |
| 1290 | |
| 1291 | /** |
| 1292 | * set_current_groups - Change current's group subscription |
| 1293 | * @group_info: The group list to impose |
| 1294 | * |
| 1295 | * Validate a group subscription and, if valid, impose it upon current's task |
| 1296 | * security record. |
| 1297 | */ |
| 1298 | int set_current_groups(struct group_info *group_info) |
| 1299 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1300 | struct cred *new; |
| 1301 | int ret; |
| 1302 | |
| 1303 | new = prepare_creds(); |
| 1304 | if (!new) |
| 1305 | return -ENOMEM; |
| 1306 | |
| 1307 | ret = set_groups(new, group_info); |
| 1308 | if (ret < 0) { |
| 1309 | abort_creds(new); |
| 1310 | return ret; |
| 1311 | } |
| 1312 | |
| 1313 | return commit_creds(new); |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1314 | } |
| 1315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | EXPORT_SYMBOL(set_current_groups); |
| 1317 | |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 1318 | SYSCALL_DEFINE2(getgroups, int, gidsetsize, gid_t __user *, grouplist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1320 | const struct cred *cred = current_cred(); |
| 1321 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | |
| 1323 | if (gidsetsize < 0) |
| 1324 | return -EINVAL; |
| 1325 | |
| 1326 | /* no need to grab task_lock here; it cannot change */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1327 | i = cred->group_info->ngroups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | if (gidsetsize) { |
| 1329 | if (i > gidsetsize) { |
| 1330 | i = -EINVAL; |
| 1331 | goto out; |
| 1332 | } |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1333 | if (groups_to_user(grouplist, cred->group_info)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | i = -EFAULT; |
| 1335 | goto out; |
| 1336 | } |
| 1337 | } |
| 1338 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | return i; |
| 1340 | } |
| 1341 | |
| 1342 | /* |
| 1343 | * SMP: Our groups are copy-on-write. We can set them safely |
| 1344 | * without another task interfering. |
| 1345 | */ |
| 1346 | |
Heiko Carstens | b290ebe | 2009-01-14 14:14:06 +0100 | [diff] [blame] | 1347 | SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | { |
| 1349 | struct group_info *group_info; |
| 1350 | int retval; |
| 1351 | |
| 1352 | if (!capable(CAP_SETGID)) |
| 1353 | return -EPERM; |
| 1354 | if ((unsigned)gidsetsize > NGROUPS_MAX) |
| 1355 | return -EINVAL; |
| 1356 | |
| 1357 | group_info = groups_alloc(gidsetsize); |
| 1358 | if (!group_info) |
| 1359 | return -ENOMEM; |
| 1360 | retval = groups_from_user(group_info, grouplist); |
| 1361 | if (retval) { |
| 1362 | put_group_info(group_info); |
| 1363 | return retval; |
| 1364 | } |
| 1365 | |
| 1366 | retval = set_current_groups(group_info); |
| 1367 | put_group_info(group_info); |
| 1368 | |
| 1369 | return retval; |
| 1370 | } |
| 1371 | |
| 1372 | /* |
| 1373 | * Check whether we're fsgid/egid or in the supplemental group.. |
| 1374 | */ |
| 1375 | int in_group_p(gid_t grp) |
| 1376 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1377 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | int retval = 1; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1379 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1380 | if (grp != cred->fsgid) |
| 1381 | retval = groups_search(cred->group_info, grp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | return retval; |
| 1383 | } |
| 1384 | |
| 1385 | EXPORT_SYMBOL(in_group_p); |
| 1386 | |
| 1387 | int in_egroup_p(gid_t grp) |
| 1388 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1389 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | int retval = 1; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1391 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1392 | if (grp != cred->egid) |
| 1393 | retval = groups_search(cred->group_info, grp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | return retval; |
| 1395 | } |
| 1396 | |
| 1397 | EXPORT_SYMBOL(in_egroup_p); |
| 1398 | |
| 1399 | DECLARE_RWSEM(uts_sem); |
| 1400 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1401 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | { |
| 1403 | int errno = 0; |
| 1404 | |
| 1405 | down_read(&uts_sem); |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 1406 | if (copy_to_user(name, utsname(), sizeof *name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | errno = -EFAULT; |
| 1408 | up_read(&uts_sem); |
| 1409 | return errno; |
| 1410 | } |
| 1411 | |
Heiko Carstens | 5a8a82b | 2009-01-14 14:14:25 +0100 | [diff] [blame] | 1412 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | { |
| 1414 | int errno; |
| 1415 | char tmp[__NEW_UTS_LEN]; |
| 1416 | |
| 1417 | if (!capable(CAP_SYS_ADMIN)) |
| 1418 | return -EPERM; |
| 1419 | if (len < 0 || len > __NEW_UTS_LEN) |
| 1420 | return -EINVAL; |
| 1421 | down_write(&uts_sem); |
| 1422 | errno = -EFAULT; |
| 1423 | if (!copy_from_user(tmp, name, len)) { |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1424 | struct new_utsname *u = utsname(); |
| 1425 | |
| 1426 | memcpy(u->nodename, tmp, len); |
| 1427 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | errno = 0; |
| 1429 | } |
| 1430 | up_write(&uts_sem); |
| 1431 | return errno; |
| 1432 | } |
| 1433 | |
| 1434 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME |
| 1435 | |
Heiko Carstens | 5a8a82b | 2009-01-14 14:14:25 +0100 | [diff] [blame] | 1436 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | { |
| 1438 | int i, errno; |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1439 | struct new_utsname *u; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | |
| 1441 | if (len < 0) |
| 1442 | return -EINVAL; |
| 1443 | down_read(&uts_sem); |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1444 | u = utsname(); |
| 1445 | i = 1 + strlen(u->nodename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | if (i > len) |
| 1447 | i = len; |
| 1448 | errno = 0; |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1449 | if (copy_to_user(name, u->nodename, i)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | errno = -EFAULT; |
| 1451 | up_read(&uts_sem); |
| 1452 | return errno; |
| 1453 | } |
| 1454 | |
| 1455 | #endif |
| 1456 | |
| 1457 | /* |
| 1458 | * Only setdomainname; getdomainname can be implemented by calling |
| 1459 | * uname() |
| 1460 | */ |
Heiko Carstens | 5a8a82b | 2009-01-14 14:14:25 +0100 | [diff] [blame] | 1461 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | { |
| 1463 | int errno; |
| 1464 | char tmp[__NEW_UTS_LEN]; |
| 1465 | |
| 1466 | if (!capable(CAP_SYS_ADMIN)) |
| 1467 | return -EPERM; |
| 1468 | if (len < 0 || len > __NEW_UTS_LEN) |
| 1469 | return -EINVAL; |
| 1470 | |
| 1471 | down_write(&uts_sem); |
| 1472 | errno = -EFAULT; |
| 1473 | if (!copy_from_user(tmp, name, len)) { |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1474 | struct new_utsname *u = utsname(); |
| 1475 | |
| 1476 | memcpy(u->domainname, tmp, len); |
| 1477 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | errno = 0; |
| 1479 | } |
| 1480 | up_write(&uts_sem); |
| 1481 | return errno; |
| 1482 | } |
| 1483 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1484 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | { |
| 1486 | if (resource >= RLIM_NLIMITS) |
| 1487 | return -EINVAL; |
| 1488 | else { |
| 1489 | struct rlimit value; |
| 1490 | task_lock(current->group_leader); |
| 1491 | value = current->signal->rlim[resource]; |
| 1492 | task_unlock(current->group_leader); |
| 1493 | return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; |
| 1494 | } |
| 1495 | } |
| 1496 | |
| 1497 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT |
| 1498 | |
| 1499 | /* |
| 1500 | * Back compatibility for getrlimit. Needed for some apps. |
| 1501 | */ |
| 1502 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1503 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
| 1504 | struct rlimit __user *, rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | { |
| 1506 | struct rlimit x; |
| 1507 | if (resource >= RLIM_NLIMITS) |
| 1508 | return -EINVAL; |
| 1509 | |
| 1510 | task_lock(current->group_leader); |
| 1511 | x = current->signal->rlim[resource]; |
| 1512 | task_unlock(current->group_leader); |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 1513 | if (x.rlim_cur > 0x7FFFFFFF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | x.rlim_cur = 0x7FFFFFFF; |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 1515 | if (x.rlim_max > 0x7FFFFFFF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | x.rlim_max = 0x7FFFFFFF; |
| 1517 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; |
| 1518 | } |
| 1519 | |
| 1520 | #endif |
| 1521 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1522 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | { |
| 1524 | struct rlimit new_rlim, *old_rlim; |
| 1525 | int retval; |
| 1526 | |
| 1527 | if (resource >= RLIM_NLIMITS) |
| 1528 | return -EINVAL; |
Andrew Morton | ec9e16b | 2006-03-24 03:18:34 -0800 | [diff] [blame] | 1529 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | return -EFAULT; |
Andrew Morton | 60fd760 | 2009-02-04 15:12:06 -0800 | [diff] [blame] | 1531 | if (new_rlim.rlim_cur > new_rlim.rlim_max) |
| 1532 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | old_rlim = current->signal->rlim + resource; |
| 1534 | if ((new_rlim.rlim_max > old_rlim->rlim_max) && |
| 1535 | !capable(CAP_SYS_RESOURCE)) |
| 1536 | return -EPERM; |
Andrew Morton | 60fd760 | 2009-02-04 15:12:06 -0800 | [diff] [blame] | 1537 | if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open) |
| 1538 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
| 1540 | retval = security_task_setrlimit(resource, &new_rlim); |
| 1541 | if (retval) |
| 1542 | return retval; |
| 1543 | |
Tom Alsberg | 9926e4c | 2007-05-08 00:30:31 -0700 | [diff] [blame] | 1544 | if (resource == RLIMIT_CPU && new_rlim.rlim_cur == 0) { |
| 1545 | /* |
| 1546 | * The caller is asking for an immediate RLIMIT_CPU |
| 1547 | * expiry. But we use the zero value to mean "it was |
| 1548 | * never set". So let's cheat and make it one second |
| 1549 | * instead |
| 1550 | */ |
| 1551 | new_rlim.rlim_cur = 1; |
| 1552 | } |
| 1553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | task_lock(current->group_leader); |
| 1555 | *old_rlim = new_rlim; |
| 1556 | task_unlock(current->group_leader); |
| 1557 | |
Andrew Morton | ec9e16b | 2006-03-24 03:18:34 -0800 | [diff] [blame] | 1558 | if (resource != RLIMIT_CPU) |
| 1559 | goto out; |
Andrew Morton | d3561f7 | 2006-03-24 03:18:36 -0800 | [diff] [blame] | 1560 | |
| 1561 | /* |
| 1562 | * RLIMIT_CPU handling. Note that the kernel fails to return an error |
| 1563 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a |
| 1564 | * very long-standing error, and fixing it now risks breakage of |
| 1565 | * applications, so we live with it |
| 1566 | */ |
Andrew Morton | ec9e16b | 2006-03-24 03:18:34 -0800 | [diff] [blame] | 1567 | if (new_rlim.rlim_cur == RLIM_INFINITY) |
| 1568 | goto out; |
| 1569 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1570 | update_rlimit_cpu(new_rlim.rlim_cur); |
Andrew Morton | ec9e16b | 2006-03-24 03:18:34 -0800 | [diff] [blame] | 1571 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | return 0; |
| 1573 | } |
| 1574 | |
| 1575 | /* |
| 1576 | * It would make sense to put struct rusage in the task_struct, |
| 1577 | * except that would make the task_struct be *really big*. After |
| 1578 | * task_struct gets moved into malloc'ed memory, it would |
| 1579 | * make sense to do this. It will make moving the rest of the information |
| 1580 | * a lot simpler! (Which we're not doing right now because we're not |
| 1581 | * measuring them yet). |
| 1582 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
| 1584 | * races with threads incrementing their own counters. But since word |
| 1585 | * reads are atomic, we either get new values or old values and we don't |
| 1586 | * care which for the sums. We always take the siglock to protect reading |
| 1587 | * the c* fields from p->signal from races with exit.c updating those |
| 1588 | * fields when reaping, so a sample either gets all the additions of a |
| 1589 | * given child after it's reaped, or none so this sample is before reaping. |
Ravikiran G Thirumalai | 2dd0ebc | 2006-03-23 03:00:13 -0800 | [diff] [blame] | 1590 | * |
Ravikiran G Thirumalai | de047c1 | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1591 | * Locking: |
| 1592 | * We need to take the siglock for CHILDEREN, SELF and BOTH |
| 1593 | * for the cases current multithreaded, non-current single threaded |
| 1594 | * non-current multithreaded. Thread traversal is now safe with |
| 1595 | * the siglock held. |
| 1596 | * Strictly speaking, we donot need to take the siglock if we are current and |
| 1597 | * single threaded, as no one else can take our signal_struct away, no one |
| 1598 | * else can reap the children to update signal->c* counters, and no one else |
| 1599 | * can race with the signal-> fields. If we do not take any lock, the |
| 1600 | * signal-> fields could be read out of order while another thread was just |
| 1601 | * exiting. So we should place a read memory barrier when we avoid the lock. |
| 1602 | * On the writer side, write memory barrier is implied in __exit_signal |
| 1603 | * as __exit_signal releases the siglock spinlock after updating the signal-> |
| 1604 | * fields. But we don't do this yet to keep things simple. |
Ravikiran G Thirumalai | 2dd0ebc | 2006-03-23 03:00:13 -0800 | [diff] [blame] | 1605 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | */ |
| 1607 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1608 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1609 | { |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1610 | r->ru_nvcsw += t->nvcsw; |
| 1611 | r->ru_nivcsw += t->nivcsw; |
| 1612 | r->ru_minflt += t->min_flt; |
| 1613 | r->ru_majflt += t->maj_flt; |
| 1614 | r->ru_inblock += task_io_get_inblock(t); |
| 1615 | r->ru_oublock += task_io_get_oublock(t); |
| 1616 | } |
| 1617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
| 1619 | { |
| 1620 | struct task_struct *t; |
| 1621 | unsigned long flags; |
| 1622 | cputime_t utime, stime; |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1623 | struct task_cputime cputime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | |
| 1625 | memset((char *) r, 0, sizeof *r); |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1626 | utime = stime = cputime_zero; |
| 1627 | |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1628 | if (who == RUSAGE_THREAD) { |
KOSAKI Motohiro | 8916ede | 2009-01-04 05:40:37 +0900 | [diff] [blame] | 1629 | utime = task_utime(current); |
| 1630 | stime = task_stime(current); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1631 | accumulate_thread_rusage(p, r); |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1632 | goto out; |
| 1633 | } |
| 1634 | |
Oleg Nesterov | d6cf723 | 2008-04-30 00:52:38 -0700 | [diff] [blame] | 1635 | if (!lock_task_sighand(p, &flags)) |
Ravikiran G Thirumalai | de047c1 | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1636 | return; |
Ravikiran G Thirumalai | 2dd0ebc | 2006-03-23 03:00:13 -0800 | [diff] [blame] | 1637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | switch (who) { |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1639 | case RUSAGE_BOTH: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | case RUSAGE_CHILDREN: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | utime = p->signal->cutime; |
| 1642 | stime = p->signal->cstime; |
| 1643 | r->ru_nvcsw = p->signal->cnvcsw; |
| 1644 | r->ru_nivcsw = p->signal->cnivcsw; |
| 1645 | r->ru_minflt = p->signal->cmin_flt; |
| 1646 | r->ru_majflt = p->signal->cmaj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 1647 | r->ru_inblock = p->signal->cinblock; |
| 1648 | r->ru_oublock = p->signal->coublock; |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1649 | |
| 1650 | if (who == RUSAGE_CHILDREN) |
| 1651 | break; |
| 1652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | case RUSAGE_SELF: |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1654 | thread_group_cputime(p, &cputime); |
| 1655 | utime = cputime_add(utime, cputime.utime); |
| 1656 | stime = cputime_add(stime, cputime.stime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | r->ru_nvcsw += p->signal->nvcsw; |
| 1658 | r->ru_nivcsw += p->signal->nivcsw; |
| 1659 | r->ru_minflt += p->signal->min_flt; |
| 1660 | r->ru_majflt += p->signal->maj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 1661 | r->ru_inblock += p->signal->inblock; |
| 1662 | r->ru_oublock += p->signal->oublock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | t = p; |
| 1664 | do { |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1665 | accumulate_thread_rusage(t, r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | t = next_thread(t); |
| 1667 | } while (t != p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | break; |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | default: |
| 1671 | BUG(); |
| 1672 | } |
Ravikiran G Thirumalai | de047c1 | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1673 | unlock_task_sighand(p, &flags); |
Ravikiran G Thirumalai | de047c1 | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1674 | |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1675 | out: |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1676 | cputime_to_timeval(utime, &r->ru_utime); |
| 1677 | cputime_to_timeval(stime, &r->ru_stime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | } |
| 1679 | |
| 1680 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) |
| 1681 | { |
| 1682 | struct rusage r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | k_getrusage(p, who, &r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
| 1685 | } |
| 1686 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1687 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | { |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1689 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
| 1690 | who != RUSAGE_THREAD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | return -EINVAL; |
| 1692 | return getrusage(current, who, ru); |
| 1693 | } |
| 1694 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1695 | SYSCALL_DEFINE1(umask, int, mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | { |
| 1697 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); |
| 1698 | return mask; |
| 1699 | } |
Serge E. Hallyn | 3b7391d | 2008-02-04 22:29:45 -0800 | [diff] [blame] | 1700 | |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 1701 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
| 1702 | unsigned long, arg4, unsigned long, arg5) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | { |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1704 | struct task_struct *me = current; |
| 1705 | unsigned char comm[sizeof(me->comm)]; |
| 1706 | long error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1708 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
| 1709 | if (error != -ENOSYS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | return error; |
| 1711 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1712 | error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | switch (option) { |
| 1714 | case PR_SET_PDEATHSIG: |
Jesper Juhl | 0730ded | 2005-09-06 15:17:37 -0700 | [diff] [blame] | 1715 | if (!valid_signal(arg2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | error = -EINVAL; |
| 1717 | break; |
| 1718 | } |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1719 | me->pdeath_signal = arg2; |
| 1720 | error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | break; |
| 1722 | case PR_GET_PDEATHSIG: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1723 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | break; |
| 1725 | case PR_GET_DUMPABLE: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1726 | error = get_dumpable(me->mm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | break; |
| 1728 | case PR_SET_DUMPABLE: |
Marcel Holtmann | abf75a5 | 2006-07-12 13:12:00 +0200 | [diff] [blame] | 1729 | if (arg2 < 0 || arg2 > 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | error = -EINVAL; |
| 1731 | break; |
| 1732 | } |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1733 | set_dumpable(me->mm, arg2); |
| 1734 | error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | break; |
| 1736 | |
| 1737 | case PR_SET_UNALIGN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1738 | error = SET_UNALIGN_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | break; |
| 1740 | case PR_GET_UNALIGN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1741 | error = GET_UNALIGN_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | break; |
| 1743 | case PR_SET_FPEMU: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1744 | error = SET_FPEMU_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | break; |
| 1746 | case PR_GET_FPEMU: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1747 | error = GET_FPEMU_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | break; |
| 1749 | case PR_SET_FPEXC: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1750 | error = SET_FPEXC_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | break; |
| 1752 | case PR_GET_FPEXC: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1753 | error = GET_FPEXC_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | break; |
| 1755 | case PR_GET_TIMING: |
| 1756 | error = PR_TIMING_STATISTICAL; |
| 1757 | break; |
| 1758 | case PR_SET_TIMING: |
Shi Weihua | 7b26655 | 2008-05-23 13:04:59 -0700 | [diff] [blame] | 1759 | if (arg2 != PR_TIMING_STATISTICAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | error = -EINVAL; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1761 | else |
| 1762 | error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | break; |
| 1764 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1765 | case PR_SET_NAME: |
| 1766 | comm[sizeof(me->comm)-1] = 0; |
| 1767 | if (strncpy_from_user(comm, (char __user *)arg2, |
| 1768 | sizeof(me->comm) - 1) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | return -EFAULT; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1770 | set_task_comm(me, comm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | return 0; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1772 | case PR_GET_NAME: |
| 1773 | get_task_comm(comm, me); |
| 1774 | if (copy_to_user((char __user *)arg2, comm, |
| 1775 | sizeof(comm))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | return -EFAULT; |
| 1777 | return 0; |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 1778 | case PR_GET_ENDIAN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1779 | error = GET_ENDIAN(me, arg2); |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 1780 | break; |
| 1781 | case PR_SET_ENDIAN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1782 | error = SET_ENDIAN(me, arg2); |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 1783 | break; |
| 1784 | |
Andrea Arcangeli | 1d9d02f | 2007-07-15 23:41:32 -0700 | [diff] [blame] | 1785 | case PR_GET_SECCOMP: |
| 1786 | error = prctl_get_seccomp(); |
| 1787 | break; |
| 1788 | case PR_SET_SECCOMP: |
| 1789 | error = prctl_set_seccomp(arg2); |
| 1790 | break; |
Erik Bosman | 8fb402b | 2008-04-11 18:54:17 +0200 | [diff] [blame] | 1791 | case PR_GET_TSC: |
| 1792 | error = GET_TSC_CTL(arg2); |
| 1793 | break; |
| 1794 | case PR_SET_TSC: |
| 1795 | error = SET_TSC_CTL(arg2); |
| 1796 | break; |
Ingo Molnar | 1d1c7dd | 2008-12-11 14:59:31 +0100 | [diff] [blame] | 1797 | case PR_TASK_PERF_COUNTERS_DISABLE: |
| 1798 | error = perf_counter_task_disable(); |
| 1799 | break; |
| 1800 | case PR_TASK_PERF_COUNTERS_ENABLE: |
| 1801 | error = perf_counter_task_enable(); |
| 1802 | break; |
Arjan van de Ven | 6976675 | 2008-09-01 15:52:40 -0700 | [diff] [blame] | 1803 | case PR_GET_TIMERSLACK: |
| 1804 | error = current->timer_slack_ns; |
| 1805 | break; |
| 1806 | case PR_SET_TIMERSLACK: |
| 1807 | if (arg2 <= 0) |
| 1808 | current->timer_slack_ns = |
| 1809 | current->default_timer_slack_ns; |
| 1810 | else |
| 1811 | current->timer_slack_ns = arg2; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1812 | error = 0; |
Arjan van de Ven | 6976675 | 2008-09-01 15:52:40 -0700 | [diff] [blame] | 1813 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | default: |
| 1815 | error = -EINVAL; |
| 1816 | break; |
| 1817 | } |
| 1818 | return error; |
| 1819 | } |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 1820 | |
Heiko Carstens | 836f92a | 2009-01-14 14:14:33 +0100 | [diff] [blame] | 1821 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
| 1822 | struct getcpu_cache __user *, unused) |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 1823 | { |
| 1824 | int err = 0; |
| 1825 | int cpu = raw_smp_processor_id(); |
| 1826 | if (cpup) |
| 1827 | err |= put_user(cpu, cpup); |
| 1828 | if (nodep) |
| 1829 | err |= put_user(cpu_to_node(cpu), nodep); |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 1830 | return err ? -EFAULT : 0; |
| 1831 | } |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 1832 | |
| 1833 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; |
| 1834 | |
| 1835 | static void argv_cleanup(char **argv, char **envp) |
| 1836 | { |
| 1837 | argv_free(argv); |
| 1838 | } |
| 1839 | |
| 1840 | /** |
| 1841 | * orderly_poweroff - Trigger an orderly system poweroff |
| 1842 | * @force: force poweroff if command execution fails |
| 1843 | * |
| 1844 | * This may be called from any context to trigger a system shutdown. |
| 1845 | * If the orderly shutdown fails, it will force an immediate shutdown. |
| 1846 | */ |
| 1847 | int orderly_poweroff(bool force) |
| 1848 | { |
| 1849 | int argc; |
| 1850 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); |
| 1851 | static char *envp[] = { |
| 1852 | "HOME=/", |
| 1853 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", |
| 1854 | NULL |
| 1855 | }; |
| 1856 | int ret = -ENOMEM; |
| 1857 | struct subprocess_info *info; |
| 1858 | |
| 1859 | if (argv == NULL) { |
| 1860 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", |
| 1861 | __func__, poweroff_cmd); |
| 1862 | goto out; |
| 1863 | } |
| 1864 | |
KOSAKI Motohiro | ac331d1 | 2008-07-25 01:45:38 -0700 | [diff] [blame] | 1865 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 1866 | if (info == NULL) { |
| 1867 | argv_free(argv); |
| 1868 | goto out; |
| 1869 | } |
| 1870 | |
| 1871 | call_usermodehelper_setcleanup(info, argv_cleanup); |
| 1872 | |
Jeremy Fitzhardinge | 86313c4 | 2007-07-17 18:37:03 -0700 | [diff] [blame] | 1873 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 1874 | |
| 1875 | out: |
| 1876 | if (ret && force) { |
| 1877 | printk(KERN_WARNING "Failed to start orderly shutdown: " |
| 1878 | "forcing the issue\n"); |
| 1879 | |
| 1880 | /* I guess this should try to kick off some daemon to |
| 1881 | sync and poweroff asap. Or not even bother syncing |
| 1882 | if we're doing an emergency shutdown? */ |
| 1883 | emergency_sync(); |
| 1884 | kernel_power_off(); |
| 1885 | } |
| 1886 | |
| 1887 | return ret; |
| 1888 | } |
| 1889 | EXPORT_SYMBOL_GPL(orderly_poweroff); |