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 | |
Paul Gortmaker | 9984de1 | 2011-05-23 14:51:41 -0400 | [diff] [blame] | 7 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <linux/mm.h> |
| 9 | #include <linux/utsname.h> |
| 10 | #include <linux/mman.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/reboot.h> |
| 12 | #include <linux/prctl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/highuid.h> |
| 14 | #include <linux/fs.h> |
Paul Gortmaker | 74da1ff | 2011-05-26 12:48:41 -0400 | [diff] [blame] | 15 | #include <linux/kmod.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 16 | #include <linux/perf_event.h> |
Daniel Walker | 3e88c55 | 2007-05-10 22:22:53 -0700 | [diff] [blame] | 17 | #include <linux/resource.h> |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/kexec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/workqueue.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 21 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/device.h> |
| 23 | #include <linux/key.h> |
| 24 | #include <linux/times.h> |
| 25 | #include <linux/posix-timers.h> |
| 26 | #include <linux/security.h> |
| 27 | #include <linux/dcookies.h> |
| 28 | #include <linux/suspend.h> |
| 29 | #include <linux/tty.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 30 | #include <linux/signal.h> |
Matt Helsley | 9f46080 | 2005-11-07 00:59:16 -0800 | [diff] [blame] | 31 | #include <linux/cn_proc.h> |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 32 | #include <linux/getcpu.h> |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 33 | #include <linux/task_io_accounting_ops.h> |
Andrea Arcangeli | 1d9d02f | 2007-07-15 23:41:32 -0700 | [diff] [blame] | 34 | #include <linux/seccomp.h> |
Mark Lord | 4047727 | 2007-10-01 01:20:10 -0700 | [diff] [blame] | 35 | #include <linux/cpu.h> |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 36 | #include <linux/personality.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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 39 | #include <linux/gfp.h> |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 40 | #include <linux/syscore_ops.h> |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 41 | #include <linux/version.h> |
| 42 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | #include <linux/compat.h> |
| 45 | #include <linux/syscalls.h> |
Keshavamurthy Anil S | 00d7c05 | 2005-12-12 00:37:33 -0800 | [diff] [blame] | 46 | #include <linux/kprobes.h> |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 47 | #include <linux/user_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 49 | #include <linux/kmsg_dump.h> |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 50 | /* Move somewhere else to avoid recompiling? */ |
| 51 | #include <generated/utsrelease.h> |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <asm/uaccess.h> |
| 54 | #include <asm/io.h> |
| 55 | #include <asm/unistd.h> |
| 56 | |
| 57 | #ifndef SET_UNALIGN_CTL |
| 58 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) |
| 59 | #endif |
| 60 | #ifndef GET_UNALIGN_CTL |
| 61 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) |
| 62 | #endif |
| 63 | #ifndef SET_FPEMU_CTL |
| 64 | # define SET_FPEMU_CTL(a,b) (-EINVAL) |
| 65 | #endif |
| 66 | #ifndef GET_FPEMU_CTL |
| 67 | # define GET_FPEMU_CTL(a,b) (-EINVAL) |
| 68 | #endif |
| 69 | #ifndef SET_FPEXC_CTL |
| 70 | # define SET_FPEXC_CTL(a,b) (-EINVAL) |
| 71 | #endif |
| 72 | #ifndef GET_FPEXC_CTL |
| 73 | # define GET_FPEXC_CTL(a,b) (-EINVAL) |
| 74 | #endif |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 75 | #ifndef GET_ENDIAN |
| 76 | # define GET_ENDIAN(a,b) (-EINVAL) |
| 77 | #endif |
| 78 | #ifndef SET_ENDIAN |
| 79 | # define SET_ENDIAN(a,b) (-EINVAL) |
| 80 | #endif |
Erik Bosman | 8fb402b | 2008-04-11 18:54:17 +0200 | [diff] [blame] | 81 | #ifndef GET_TSC_CTL |
| 82 | # define GET_TSC_CTL(a) (-EINVAL) |
| 83 | #endif |
| 84 | #ifndef SET_TSC_CTL |
| 85 | # define SET_TSC_CTL(a) (-EINVAL) |
| 86 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | /* |
| 89 | * this is where the system-wide overflow UID and GID are defined, for |
| 90 | * architectures that now have 32-bit UID/GID but didn't in the past |
| 91 | */ |
| 92 | |
| 93 | int overflowuid = DEFAULT_OVERFLOWUID; |
| 94 | int overflowgid = DEFAULT_OVERFLOWGID; |
| 95 | |
| 96 | #ifdef CONFIG_UID16 |
| 97 | EXPORT_SYMBOL(overflowuid); |
| 98 | EXPORT_SYMBOL(overflowgid); |
| 99 | #endif |
| 100 | |
| 101 | /* |
| 102 | * the same as above, but for filesystems which can only store a 16-bit |
| 103 | * UID and GID. as such, this is needed on all architectures |
| 104 | */ |
| 105 | |
| 106 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; |
| 107 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; |
| 108 | |
| 109 | EXPORT_SYMBOL(fs_overflowuid); |
| 110 | EXPORT_SYMBOL(fs_overflowgid); |
| 111 | |
| 112 | /* |
| 113 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes |
| 114 | */ |
| 115 | |
| 116 | int C_A_D = 1; |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 117 | struct pid *cad_pid; |
| 118 | EXPORT_SYMBOL(cad_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | /* |
Rafael J. Wysocki | bd804eb | 2007-07-19 01:47:40 -0700 | [diff] [blame] | 121 | * If set, this is used for preparing the system to power off. |
| 122 | */ |
| 123 | |
| 124 | void (*pm_power_off_prepare)(void); |
Rafael J. Wysocki | bd804eb | 2007-07-19 01:47:40 -0700 | [diff] [blame] | 125 | |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 126 | /* |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 127 | * Returns true if current's euid is same as p's uid or euid, |
| 128 | * or has CAP_SYS_NICE to p's user_ns. |
| 129 | * |
| 130 | * Called with rcu_read_lock, creds are safe |
| 131 | */ |
| 132 | static bool set_one_prio_perm(struct task_struct *p) |
| 133 | { |
| 134 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); |
| 135 | |
| 136 | if (pcred->user->user_ns == cred->user->user_ns && |
| 137 | (pcred->uid == cred->euid || |
| 138 | pcred->euid == cred->euid)) |
| 139 | return true; |
| 140 | if (ns_capable(pcred->user->user_ns, CAP_SYS_NICE)) |
| 141 | return true; |
| 142 | return false; |
| 143 | } |
| 144 | |
| 145 | /* |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 146 | * set the priority of a task |
| 147 | * - the caller must hold the RCU read lock |
| 148 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
| 150 | { |
| 151 | int no_nice; |
| 152 | |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 153 | if (!set_one_prio_perm(p)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | error = -EPERM; |
| 155 | goto out; |
| 156 | } |
Matt Mackall | e43379f | 2005-05-01 08:59:00 -0700 | [diff] [blame] | 157 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | error = -EACCES; |
| 159 | goto out; |
| 160 | } |
| 161 | no_nice = security_task_setnice(p, niceval); |
| 162 | if (no_nice) { |
| 163 | error = no_nice; |
| 164 | goto out; |
| 165 | } |
| 166 | if (error == -ESRCH) |
| 167 | error = 0; |
| 168 | set_user_nice(p, niceval); |
| 169 | out: |
| 170 | return error; |
| 171 | } |
| 172 | |
Heiko Carstens | 754fe8d | 2009-01-14 14:14:09 +0100 | [diff] [blame] | 173 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | { |
| 175 | struct task_struct *g, *p; |
| 176 | struct user_struct *user; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 177 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | int error = -EINVAL; |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 179 | struct pid *pgrp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
Daniel Walker | 3e88c55 | 2007-05-10 22:22:53 -0700 | [diff] [blame] | 181 | if (which > PRIO_USER || which < PRIO_PROCESS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | goto out; |
| 183 | |
| 184 | /* normalize: avoid signed division (rounding problems) */ |
| 185 | error = -ESRCH; |
| 186 | if (niceval < -20) |
| 187 | niceval = -20; |
| 188 | if (niceval > 19) |
| 189 | niceval = 19; |
| 190 | |
Thomas Gleixner | d4581a2 | 2009-12-10 00:52:51 +0000 | [diff] [blame] | 191 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | read_lock(&tasklist_lock); |
| 193 | switch (which) { |
| 194 | case PRIO_PROCESS: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 195 | if (who) |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 196 | p = find_task_by_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 197 | else |
| 198 | p = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | if (p) |
| 200 | error = set_one_prio(p, niceval, error); |
| 201 | break; |
| 202 | case PRIO_PGRP: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 203 | if (who) |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 204 | pgrp = find_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 205 | else |
| 206 | pgrp = task_pgrp(current); |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 207 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | error = set_one_prio(p, niceval, error); |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 209 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | break; |
| 211 | case PRIO_USER: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 212 | user = (struct user_struct *) cred->user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | if (!who) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 214 | who = cred->uid; |
| 215 | else if ((who != cred->uid) && |
| 216 | !(user = find_user(who))) |
| 217 | goto out_unlock; /* No processes for this user */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
H Hartley Sweeten | dfc6a73 | 2009-12-14 18:00:22 -0800 | [diff] [blame] | 219 | do_each_thread(g, p) { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 220 | if (__task_cred(p)->uid == who) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | error = set_one_prio(p, niceval, error); |
H Hartley Sweeten | dfc6a73 | 2009-12-14 18:00:22 -0800 | [diff] [blame] | 222 | } while_each_thread(g, p); |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 223 | if (who != cred->uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | free_uid(user); /* For find_user() */ |
| 225 | break; |
| 226 | } |
| 227 | out_unlock: |
| 228 | read_unlock(&tasklist_lock); |
Thomas Gleixner | d4581a2 | 2009-12-10 00:52:51 +0000 | [diff] [blame] | 229 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | out: |
| 231 | return error; |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Ugh. To avoid negative return values, "getpriority()" will |
| 236 | * not return the normal nice-value, but a negated value that |
| 237 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) |
| 238 | * to stay compatible. |
| 239 | */ |
Heiko Carstens | 754fe8d | 2009-01-14 14:14:09 +0100 | [diff] [blame] | 240 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | { |
| 242 | struct task_struct *g, *p; |
| 243 | struct user_struct *user; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 244 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | long niceval, retval = -ESRCH; |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 246 | struct pid *pgrp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Daniel Walker | 3e88c55 | 2007-05-10 22:22:53 -0700 | [diff] [blame] | 248 | if (which > PRIO_USER || which < PRIO_PROCESS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | return -EINVAL; |
| 250 | |
Tetsuo Handa | 7011883 | 2010-02-22 12:44:16 -0800 | [diff] [blame] | 251 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | read_lock(&tasklist_lock); |
| 253 | switch (which) { |
| 254 | case PRIO_PROCESS: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 255 | if (who) |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 256 | p = find_task_by_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 257 | else |
| 258 | p = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | if (p) { |
| 260 | niceval = 20 - task_nice(p); |
| 261 | if (niceval > retval) |
| 262 | retval = niceval; |
| 263 | } |
| 264 | break; |
| 265 | case PRIO_PGRP: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 266 | if (who) |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 267 | pgrp = find_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 268 | else |
| 269 | pgrp = task_pgrp(current); |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 270 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | niceval = 20 - task_nice(p); |
| 272 | if (niceval > retval) |
| 273 | retval = niceval; |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 274 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | break; |
| 276 | case PRIO_USER: |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 277 | user = (struct user_struct *) cred->user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | if (!who) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 279 | who = cred->uid; |
| 280 | else if ((who != cred->uid) && |
| 281 | !(user = find_user(who))) |
| 282 | goto out_unlock; /* No processes for this user */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
H Hartley Sweeten | dfc6a73 | 2009-12-14 18:00:22 -0800 | [diff] [blame] | 284 | do_each_thread(g, p) { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 285 | if (__task_cred(p)->uid == who) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | niceval = 20 - task_nice(p); |
| 287 | if (niceval > retval) |
| 288 | retval = niceval; |
| 289 | } |
H Hartley Sweeten | dfc6a73 | 2009-12-14 18:00:22 -0800 | [diff] [blame] | 290 | } while_each_thread(g, p); |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 291 | if (who != cred->uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | free_uid(user); /* for find_user() */ |
| 293 | break; |
| 294 | } |
| 295 | out_unlock: |
| 296 | read_unlock(&tasklist_lock); |
Tetsuo Handa | 7011883 | 2010-02-22 12:44:16 -0800 | [diff] [blame] | 297 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
| 299 | return retval; |
| 300 | } |
| 301 | |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 302 | /** |
| 303 | * emergency_restart - reboot the system |
| 304 | * |
| 305 | * Without shutting down any hardware or taking any locks |
| 306 | * reboot the system. This is called when we know we are in |
| 307 | * trouble so this is our best effort to reboot. This is |
| 308 | * safe to call in interrupt context. |
| 309 | */ |
Eric W. Biederman | 7c90347 | 2005-07-26 11:29:55 -0600 | [diff] [blame] | 310 | void emergency_restart(void) |
| 311 | { |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 312 | kmsg_dump(KMSG_DUMP_EMERG); |
Eric W. Biederman | 7c90347 | 2005-07-26 11:29:55 -0600 | [diff] [blame] | 313 | machine_emergency_restart(); |
| 314 | } |
| 315 | EXPORT_SYMBOL_GPL(emergency_restart); |
| 316 | |
Huang Ying | ca195b7 | 2008-08-15 00:40:24 -0700 | [diff] [blame] | 317 | void kernel_restart_prepare(char *cmd) |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 318 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 319 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 320 | system_state = SYSTEM_RESTART; |
Kay Sievers | b50fa7c | 2011-05-05 13:32:05 +0200 | [diff] [blame] | 321 | usermodehelper_disable(); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 322 | device_shutdown(); |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 323 | syscore_shutdown(); |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 324 | } |
Randy Dunlap | 1e5d533 | 2005-11-07 01:01:06 -0800 | [diff] [blame] | 325 | |
| 326 | /** |
Amerigo Wang | c5f4175 | 2011-07-25 17:13:10 -0700 | [diff] [blame] | 327 | * register_reboot_notifier - Register function to be called at reboot time |
| 328 | * @nb: Info about notifier function to be called |
| 329 | * |
| 330 | * Registers a function with the list of functions |
| 331 | * to be called at reboot time. |
| 332 | * |
| 333 | * Currently always returns zero, as blocking_notifier_chain_register() |
| 334 | * always returns zero. |
| 335 | */ |
| 336 | int register_reboot_notifier(struct notifier_block *nb) |
| 337 | { |
| 338 | return blocking_notifier_chain_register(&reboot_notifier_list, nb); |
| 339 | } |
| 340 | EXPORT_SYMBOL(register_reboot_notifier); |
| 341 | |
| 342 | /** |
| 343 | * unregister_reboot_notifier - Unregister previously registered reboot notifier |
| 344 | * @nb: Hook to be unregistered |
| 345 | * |
| 346 | * Unregisters a previously registered reboot |
| 347 | * notifier function. |
| 348 | * |
| 349 | * Returns zero on success, or %-ENOENT on failure. |
| 350 | */ |
| 351 | int unregister_reboot_notifier(struct notifier_block *nb) |
| 352 | { |
| 353 | return blocking_notifier_chain_unregister(&reboot_notifier_list, nb); |
| 354 | } |
| 355 | EXPORT_SYMBOL(unregister_reboot_notifier); |
| 356 | |
| 357 | /** |
Randy Dunlap | 1e5d533 | 2005-11-07 01:01:06 -0800 | [diff] [blame] | 358 | * kernel_restart - reboot the system |
| 359 | * @cmd: pointer to buffer containing command to execute for restart |
Randy Dunlap | b8887e6 | 2005-11-07 01:01:07 -0800 | [diff] [blame] | 360 | * or %NULL |
Randy Dunlap | 1e5d533 | 2005-11-07 01:01:06 -0800 | [diff] [blame] | 361 | * |
| 362 | * Shutdown everything and perform a clean reboot. |
| 363 | * This is not safe to call in interrupt context. |
| 364 | */ |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 365 | void kernel_restart(char *cmd) |
| 366 | { |
| 367 | kernel_restart_prepare(cmd); |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 368 | if (!cmd) |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 369 | printk(KERN_EMERG "Restarting system.\n"); |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 370 | else |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 371 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 372 | kmsg_dump(KMSG_DUMP_RESTART); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 373 | machine_restart(cmd); |
| 374 | } |
| 375 | EXPORT_SYMBOL_GPL(kernel_restart); |
| 376 | |
Adrian Bunk | 4ef7229 | 2008-02-04 22:30:06 -0800 | [diff] [blame] | 377 | static void kernel_shutdown_prepare(enum system_states state) |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 378 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 379 | blocking_notifier_call_chain(&reboot_notifier_list, |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 380 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
| 381 | system_state = state; |
Kay Sievers | b50fa7c | 2011-05-05 13:32:05 +0200 | [diff] [blame] | 382 | usermodehelper_disable(); |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 383 | device_shutdown(); |
| 384 | } |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 385 | /** |
| 386 | * kernel_halt - halt the system |
| 387 | * |
| 388 | * Shutdown everything and perform a clean system halt. |
| 389 | */ |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 390 | void kernel_halt(void) |
| 391 | { |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 392 | kernel_shutdown_prepare(SYSTEM_HALT); |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 393 | syscore_shutdown(); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 394 | printk(KERN_EMERG "System halted.\n"); |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 395 | kmsg_dump(KMSG_DUMP_HALT); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 396 | machine_halt(); |
| 397 | } |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 398 | |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 399 | EXPORT_SYMBOL_GPL(kernel_halt); |
| 400 | |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 401 | /** |
| 402 | * kernel_power_off - power_off the system |
| 403 | * |
| 404 | * Shutdown everything and perform a clean system power_off. |
| 405 | */ |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 406 | void kernel_power_off(void) |
| 407 | { |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 408 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
Rafael J. Wysocki | bd804eb | 2007-07-19 01:47:40 -0700 | [diff] [blame] | 409 | if (pm_power_off_prepare) |
| 410 | pm_power_off_prepare(); |
Mark Lord | 4047727 | 2007-10-01 01:20:10 -0700 | [diff] [blame] | 411 | disable_nonboot_cpus(); |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 412 | syscore_shutdown(); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 413 | printk(KERN_EMERG "Power down.\n"); |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 414 | kmsg_dump(KMSG_DUMP_POWEROFF); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 415 | machine_power_off(); |
| 416 | } |
| 417 | EXPORT_SYMBOL_GPL(kernel_power_off); |
Thomas Gleixner | 6f15fa5 | 2009-10-09 20:31:33 +0200 | [diff] [blame] | 418 | |
| 419 | static DEFINE_MUTEX(reboot_mutex); |
| 420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /* |
| 422 | * Reboot system call: for obvious reasons only root may call it, |
| 423 | * and even root needs to set up some magic numbers in the registers |
| 424 | * so that some mistake won't make this reboot the whole machine. |
| 425 | * You can also set the meaning of the ctrl-alt-del-key here. |
| 426 | * |
| 427 | * reboot doesn't sync: do that yourself before calling this. |
| 428 | */ |
Heiko Carstens | 754fe8d | 2009-01-14 14:14:09 +0100 | [diff] [blame] | 429 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
| 430 | void __user *, arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | { |
| 432 | char buffer[256]; |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 433 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
| 435 | /* We only trust the superuser with rebooting the system. */ |
| 436 | if (!capable(CAP_SYS_BOOT)) |
| 437 | return -EPERM; |
| 438 | |
| 439 | /* For safety, we require "magic" arguments. */ |
| 440 | if (magic1 != LINUX_REBOOT_MAGIC1 || |
| 441 | (magic2 != LINUX_REBOOT_MAGIC2 && |
| 442 | magic2 != LINUX_REBOOT_MAGIC2A && |
| 443 | magic2 != LINUX_REBOOT_MAGIC2B && |
| 444 | magic2 != LINUX_REBOOT_MAGIC2C)) |
| 445 | return -EINVAL; |
| 446 | |
Eric W. Biederman | 5e38291 | 2006-01-08 01:03:46 -0800 | [diff] [blame] | 447 | /* Instead of trying to make the power_off code look like |
| 448 | * halt when pm_power_off is not set do it the easy way. |
| 449 | */ |
| 450 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) |
| 451 | cmd = LINUX_REBOOT_CMD_HALT; |
| 452 | |
Thomas Gleixner | 6f15fa5 | 2009-10-09 20:31:33 +0200 | [diff] [blame] | 453 | mutex_lock(&reboot_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | switch (cmd) { |
| 455 | case LINUX_REBOOT_CMD_RESTART: |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 456 | kernel_restart(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | break; |
| 458 | |
| 459 | case LINUX_REBOOT_CMD_CAD_ON: |
| 460 | C_A_D = 1; |
| 461 | break; |
| 462 | |
| 463 | case LINUX_REBOOT_CMD_CAD_OFF: |
| 464 | C_A_D = 0; |
| 465 | break; |
| 466 | |
| 467 | case LINUX_REBOOT_CMD_HALT: |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 468 | kernel_halt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | do_exit(0); |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 470 | panic("cannot halt"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | case LINUX_REBOOT_CMD_POWER_OFF: |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 473 | kernel_power_off(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | do_exit(0); |
| 475 | break; |
| 476 | |
| 477 | case LINUX_REBOOT_CMD_RESTART2: |
| 478 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { |
Thomas Gleixner | 6f15fa5 | 2009-10-09 20:31:33 +0200 | [diff] [blame] | 479 | ret = -EFAULT; |
| 480 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | buffer[sizeof(buffer) - 1] = '\0'; |
| 483 | |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 484 | kernel_restart(buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | break; |
| 486 | |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 487 | #ifdef CONFIG_KEXEC |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 488 | case LINUX_REBOOT_CMD_KEXEC: |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 489 | ret = kernel_kexec(); |
| 490 | break; |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 491 | #endif |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 492 | |
Rafael J. Wysocki | b0cb1a1 | 2007-07-29 23:24:36 +0200 | [diff] [blame] | 493 | #ifdef CONFIG_HIBERNATION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 495 | ret = hibernate(); |
| 496 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | #endif |
| 498 | |
| 499 | default: |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 500 | ret = -EINVAL; |
| 501 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | } |
Thomas Gleixner | 6f15fa5 | 2009-10-09 20:31:33 +0200 | [diff] [blame] | 503 | mutex_unlock(&reboot_mutex); |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 504 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
| 506 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 507 | static void deferred_cad(struct work_struct *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | { |
Eric W. Biederman | abcd9e5 | 2005-07-26 11:27:34 -0600 | [diff] [blame] | 509 | kernel_restart(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
| 511 | |
| 512 | /* |
| 513 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. |
| 514 | * As it's called within an interrupt, it may NOT sync: the only choice |
| 515 | * is whether to reboot at once, or just ignore the ctrl-alt-del. |
| 516 | */ |
| 517 | void ctrl_alt_del(void) |
| 518 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 519 | static DECLARE_WORK(cad_work, deferred_cad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
| 521 | if (C_A_D) |
| 522 | schedule_work(&cad_work); |
| 523 | else |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 524 | kill_cad_pid(SIGINT, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | } |
| 526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | /* |
| 528 | * Unprivileged users may change the real gid to the effective gid |
| 529 | * or vice versa. (BSD-style) |
| 530 | * |
| 531 | * If you set the real gid at all, or set the effective gid to a value not |
| 532 | * equal to the real gid, then the saved gid is set to the new effective gid. |
| 533 | * |
| 534 | * This makes it possible for a setgid program to completely drop its |
| 535 | * privileges, which is often a useful assertion to make when you are doing |
| 536 | * a security audit over a program. |
| 537 | * |
| 538 | * The general idea is that a program which uses just setregid() will be |
| 539 | * 100% compatible with BSD. A program which uses just setgid() will be |
| 540 | * 100% compatible with POSIX with saved IDs. |
| 541 | * |
| 542 | * SMP: There are not races, the GIDs are checked only by filesystem |
| 543 | * operations (as far as semantic preservation is concerned). |
| 544 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 545 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 547 | const struct cred *old; |
| 548 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | int retval; |
| 550 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 551 | new = prepare_creds(); |
| 552 | if (!new) |
| 553 | return -ENOMEM; |
| 554 | old = current_cred(); |
| 555 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 556 | retval = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | if (rgid != (gid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 558 | if (old->gid == rgid || |
| 559 | old->egid == rgid || |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 560 | nsown_capable(CAP_SETGID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 561 | new->gid = rgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 563 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } |
| 565 | if (egid != (gid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 566 | if (old->gid == egid || |
| 567 | old->egid == egid || |
| 568 | old->sgid == egid || |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 569 | nsown_capable(CAP_SETGID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 570 | new->egid = egid; |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 571 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 572 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | if (rgid != (gid_t) -1 || |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 576 | (egid != (gid_t) -1 && egid != old->gid)) |
| 577 | new->sgid = new->egid; |
| 578 | new->fsgid = new->egid; |
| 579 | |
| 580 | return commit_creds(new); |
| 581 | |
| 582 | error: |
| 583 | abort_creds(new); |
| 584 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | } |
| 586 | |
| 587 | /* |
| 588 | * setgid() is implemented like SysV w/ SAVED_IDS |
| 589 | * |
| 590 | * SMP: Same implicit races as above. |
| 591 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 592 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 594 | const struct cred *old; |
| 595 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | int retval; |
| 597 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 598 | new = prepare_creds(); |
| 599 | if (!new) |
| 600 | return -ENOMEM; |
| 601 | old = current_cred(); |
| 602 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 603 | retval = -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 604 | if (nsown_capable(CAP_SETGID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 605 | new->gid = new->egid = new->sgid = new->fsgid = gid; |
| 606 | else if (gid == old->gid || gid == old->sgid) |
| 607 | new->egid = new->fsgid = gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 609 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 611 | return commit_creds(new); |
| 612 | |
| 613 | error: |
| 614 | abort_creds(new); |
| 615 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 617 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 618 | /* |
| 619 | * change the user struct in a credentials set to match the new UID |
| 620 | */ |
| 621 | static int set_user(struct cred *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
| 623 | struct user_struct *new_user; |
| 624 | |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 625 | new_user = alloc_uid(current_user_ns(), new->uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | if (!new_user) |
| 627 | return -EAGAIN; |
| 628 | |
Vasiliy Kulikov | 72fa599 | 2011-08-08 19:02:04 +0400 | [diff] [blame] | 629 | /* |
| 630 | * We don't fail in case of NPROC limit excess here because too many |
| 631 | * poorly written programs don't check set*uid() return code, assuming |
| 632 | * it never fails if called by root. We may still enforce NPROC limit |
| 633 | * for programs doing set*uid()+execve() by harmlessly deferring the |
| 634 | * failure to the execve() stage. |
| 635 | */ |
Jiri Slaby | 78d7d40 | 2010-03-05 13:42:54 -0800 | [diff] [blame] | 636 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
Vasiliy Kulikov | 72fa599 | 2011-08-08 19:02:04 +0400 | [diff] [blame] | 637 | new_user != INIT_USER) |
| 638 | current->flags |= PF_NPROC_EXCEEDED; |
| 639 | else |
| 640 | current->flags &= ~PF_NPROC_EXCEEDED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 642 | free_uid(new->user); |
| 643 | new->user = new_user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | /* |
| 648 | * Unprivileged users may change the real uid to the effective uid |
| 649 | * or vice versa. (BSD-style) |
| 650 | * |
| 651 | * If you set the real uid at all, or set the effective uid to a value not |
| 652 | * equal to the real uid, then the saved uid is set to the new effective uid. |
| 653 | * |
| 654 | * This makes it possible for a setuid program to completely drop its |
| 655 | * privileges, which is often a useful assertion to make when you are doing |
| 656 | * a security audit over a program. |
| 657 | * |
| 658 | * The general idea is that a program which uses just setreuid() will be |
| 659 | * 100% compatible with BSD. A program which uses just setuid() will be |
| 660 | * 100% compatible with POSIX with saved IDs. |
| 661 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 662 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 664 | const struct cred *old; |
| 665 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | int retval; |
| 667 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 668 | new = prepare_creds(); |
| 669 | if (!new) |
| 670 | return -ENOMEM; |
| 671 | old = current_cred(); |
| 672 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 673 | retval = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | if (ruid != (uid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 675 | new->uid = ruid; |
| 676 | if (old->uid != ruid && |
| 677 | old->euid != ruid && |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 678 | !nsown_capable(CAP_SETUID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 679 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | if (euid != (uid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 683 | new->euid = euid; |
| 684 | if (old->uid != euid && |
| 685 | old->euid != euid && |
| 686 | old->suid != euid && |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 687 | !nsown_capable(CAP_SETUID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 688 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | } |
| 690 | |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 691 | if (new->uid != old->uid) { |
| 692 | retval = set_user(new); |
| 693 | if (retval < 0) |
| 694 | goto error; |
| 695 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | if (ruid != (uid_t) -1 || |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 697 | (euid != (uid_t) -1 && euid != old->uid)) |
| 698 | new->suid = new->euid; |
| 699 | new->fsuid = new->euid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 701 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
| 702 | if (retval < 0) |
| 703 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 705 | return commit_creds(new); |
| 706 | |
| 707 | error: |
| 708 | abort_creds(new); |
| 709 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
| 712 | /* |
| 713 | * setuid() is implemented like SysV with SAVED_IDS |
| 714 | * |
| 715 | * Note that SAVED_ID's is deficient in that a setuid root program |
| 716 | * like sendmail, for example, cannot set its uid to be a normal |
| 717 | * user and then switch back, because if you're root, setuid() sets |
| 718 | * the saved uid too. If you don't like this, blame the bright people |
| 719 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() |
| 720 | * will allow a root program to temporarily drop privileges and be able to |
| 721 | * regain them by swapping the real and effective uid. |
| 722 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 723 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 725 | const struct cred *old; |
| 726 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | int retval; |
| 728 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 729 | new = prepare_creds(); |
| 730 | if (!new) |
| 731 | return -ENOMEM; |
| 732 | old = current_cred(); |
| 733 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 734 | retval = -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 735 | if (nsown_capable(CAP_SETUID)) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 736 | new->suid = new->uid = uid; |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 737 | if (uid != old->uid) { |
| 738 | retval = set_user(new); |
| 739 | if (retval < 0) |
| 740 | goto error; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 741 | } |
| 742 | } else if (uid != old->uid && uid != new->suid) { |
| 743 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 746 | new->fsuid = new->euid = uid; |
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 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); |
| 749 | if (retval < 0) |
| 750 | goto error; |
| 751 | |
| 752 | return commit_creds(new); |
| 753 | |
| 754 | error: |
| 755 | abort_creds(new); |
| 756 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | } |
| 758 | |
| 759 | |
| 760 | /* |
| 761 | * This function implements a generic ability to update ruid, euid, |
| 762 | * and suid. This allows you to implement the 4.4 compatible seteuid(). |
| 763 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 764 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 766 | const struct cred *old; |
| 767 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | int retval; |
| 769 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 770 | new = prepare_creds(); |
| 771 | if (!new) |
| 772 | return -ENOMEM; |
| 773 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 774 | old = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 776 | retval = -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 777 | if (!nsown_capable(CAP_SETUID)) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 778 | if (ruid != (uid_t) -1 && ruid != old->uid && |
| 779 | ruid != old->euid && ruid != old->suid) |
| 780 | goto error; |
| 781 | if (euid != (uid_t) -1 && euid != old->uid && |
| 782 | euid != old->euid && euid != old->suid) |
| 783 | goto error; |
| 784 | if (suid != (uid_t) -1 && suid != old->uid && |
| 785 | suid != old->euid && suid != old->suid) |
| 786 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 788 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | if (ruid != (uid_t) -1) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 790 | new->uid = ruid; |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 791 | if (ruid != old->uid) { |
| 792 | retval = set_user(new); |
| 793 | if (retval < 0) |
| 794 | goto error; |
| 795 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 797 | if (euid != (uid_t) -1) |
| 798 | new->euid = euid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | if (suid != (uid_t) -1) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 800 | new->suid = suid; |
| 801 | new->fsuid = new->euid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 803 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
| 804 | if (retval < 0) |
| 805 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 807 | return commit_creds(new); |
| 808 | |
| 809 | error: |
| 810 | abort_creds(new); |
| 811 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | } |
| 813 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 814 | 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] | 815 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 816 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | int retval; |
| 818 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 819 | if (!(retval = put_user(cred->uid, ruid)) && |
| 820 | !(retval = put_user(cred->euid, euid))) |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 821 | retval = put_user(cred->suid, suid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
| 823 | return retval; |
| 824 | } |
| 825 | |
| 826 | /* |
| 827 | * Same as above, but for rgid, egid, sgid. |
| 828 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 829 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 831 | const struct cred *old; |
| 832 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | int retval; |
| 834 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 835 | new = prepare_creds(); |
| 836 | if (!new) |
| 837 | return -ENOMEM; |
| 838 | old = current_cred(); |
| 839 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 840 | retval = -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 841 | if (!nsown_capable(CAP_SETGID)) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 842 | if (rgid != (gid_t) -1 && rgid != old->gid && |
| 843 | rgid != old->egid && rgid != old->sgid) |
| 844 | goto error; |
| 845 | if (egid != (gid_t) -1 && egid != old->gid && |
| 846 | egid != old->egid && egid != old->sgid) |
| 847 | goto error; |
| 848 | if (sgid != (gid_t) -1 && sgid != old->gid && |
| 849 | sgid != old->egid && sgid != old->sgid) |
| 850 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 853 | if (rgid != (gid_t) -1) |
| 854 | new->gid = rgid; |
| 855 | if (egid != (gid_t) -1) |
| 856 | new->egid = egid; |
| 857 | if (sgid != (gid_t) -1) |
| 858 | new->sgid = sgid; |
| 859 | new->fsgid = new->egid; |
| 860 | |
| 861 | return commit_creds(new); |
| 862 | |
| 863 | error: |
| 864 | abort_creds(new); |
| 865 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | } |
| 867 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 868 | 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] | 869 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 870 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | int retval; |
| 872 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 873 | if (!(retval = put_user(cred->gid, rgid)) && |
| 874 | !(retval = put_user(cred->egid, egid))) |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 875 | retval = put_user(cred->sgid, sgid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
| 877 | return retval; |
| 878 | } |
| 879 | |
| 880 | |
| 881 | /* |
| 882 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This |
| 883 | * is used for "access()" and for the NFS daemon (letting nfsd stay at |
| 884 | * whatever uid it wants to). It normally shadows "euid", except when |
| 885 | * explicitly set by setfsuid() or for access.. |
| 886 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 887 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 889 | const struct cred *old; |
| 890 | struct cred *new; |
| 891 | uid_t old_fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 893 | new = prepare_creds(); |
| 894 | if (!new) |
| 895 | return current_fsuid(); |
| 896 | old = current_cred(); |
| 897 | old_fsuid = old->fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 899 | if (uid == old->uid || uid == old->euid || |
| 900 | uid == old->suid || uid == old->fsuid || |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 901 | nsown_capable(CAP_SETUID)) { |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 902 | if (uid != old_fsuid) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 903 | new->fsuid = uid; |
| 904 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) |
| 905 | goto change_okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
| 908 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 909 | abort_creds(new); |
| 910 | return old_fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 912 | change_okay: |
| 913 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | return old_fsuid; |
| 915 | } |
| 916 | |
| 917 | /* |
John Anthony Kazos Jr | f42df9e | 2007-05-09 08:23:08 +0200 | [diff] [blame] | 918 | * Samma på svenska.. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 920 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 922 | const struct cred *old; |
| 923 | struct cred *new; |
| 924 | gid_t old_fsgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 926 | new = prepare_creds(); |
| 927 | if (!new) |
| 928 | return current_fsgid(); |
| 929 | old = current_cred(); |
| 930 | old_fsgid = old->fsgid; |
| 931 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 932 | if (gid == old->gid || gid == old->egid || |
| 933 | gid == old->sgid || gid == old->fsgid || |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 934 | nsown_capable(CAP_SETGID)) { |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 935 | if (gid != old_fsgid) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 936 | new->fsgid = gid; |
| 937 | goto change_okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 940 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 941 | abort_creds(new); |
| 942 | return old_fsgid; |
| 943 | |
| 944 | change_okay: |
| 945 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | return old_fsgid; |
| 947 | } |
| 948 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 949 | void do_sys_times(struct tms *tms) |
| 950 | { |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 951 | cputime_t tgutime, tgstime, cutime, cstime; |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 952 | |
Oleg Nesterov | 2b5fe6d | 2008-11-17 15:40:08 +0100 | [diff] [blame] | 953 | spin_lock_irq(¤t->sighand->siglock); |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 954 | thread_group_times(current, &tgutime, &tgstime); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 955 | cutime = current->signal->cutime; |
| 956 | cstime = current->signal->cstime; |
| 957 | spin_unlock_irq(¤t->sighand->siglock); |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 958 | tms->tms_utime = cputime_to_clock_t(tgutime); |
| 959 | tms->tms_stime = cputime_to_clock_t(tgstime); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 960 | tms->tms_cutime = cputime_to_clock_t(cutime); |
| 961 | tms->tms_cstime = cputime_to_clock_t(cstime); |
| 962 | } |
| 963 | |
Heiko Carstens | 58fd3aa | 2009-01-14 14:14:03 +0100 | [diff] [blame] | 964 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | if (tbuf) { |
| 967 | struct tms tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 969 | do_sys_times(&tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
| 971 | return -EFAULT; |
| 972 | } |
Paul Mackerras | e3d5a27 | 2009-01-06 14:41:02 -0800 | [diff] [blame] | 973 | force_successful_syscall_return(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
| 975 | } |
| 976 | |
| 977 | /* |
| 978 | * This needs some heavy checking ... |
| 979 | * I just haven't the stomach for it. I also don't fully |
| 980 | * understand sessions/pgrp etc. Let somebody who does explain it. |
| 981 | * |
| 982 | * OK, I think I have the protection semantics right.... this is really |
| 983 | * only important on a multi-user system anyway, to make sure one user |
| 984 | * can't send a signal to a process owned by another. -TYT, 12/12/91 |
| 985 | * |
| 986 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. |
| 987 | * LBT 04.03.94 |
| 988 | */ |
Heiko Carstens | b290ebe | 2009-01-14 14:14:06 +0100 | [diff] [blame] | 989 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | { |
| 991 | struct task_struct *p; |
Oleg Nesterov | ee0acf9 | 2006-01-08 01:03:53 -0800 | [diff] [blame] | 992 | struct task_struct *group_leader = current->group_leader; |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 993 | struct pid *pgrp; |
| 994 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | |
| 996 | if (!pid) |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 997 | pid = task_pid_vnr(group_leader); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | if (!pgid) |
| 999 | pgid = pid; |
| 1000 | if (pgid < 0) |
| 1001 | return -EINVAL; |
Paul E. McKenney | 950eaac | 2010-08-31 17:00:18 -0700 | [diff] [blame] | 1002 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | |
| 1004 | /* From this point forward we keep holding onto the tasklist lock |
| 1005 | * so that our parent does not change from under us. -DaveM |
| 1006 | */ |
| 1007 | write_lock_irq(&tasklist_lock); |
| 1008 | |
| 1009 | err = -ESRCH; |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1010 | p = find_task_by_vpid(pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | if (!p) |
| 1012 | goto out; |
| 1013 | |
| 1014 | err = -EINVAL; |
| 1015 | if (!thread_group_leader(p)) |
| 1016 | goto out; |
| 1017 | |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1018 | if (same_thread_group(p->real_parent, group_leader)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | err = -EPERM; |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 1020 | if (task_session(p) != task_session(group_leader)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | goto out; |
| 1022 | err = -EACCES; |
| 1023 | if (p->did_exec) |
| 1024 | goto out; |
| 1025 | } else { |
| 1026 | err = -ESRCH; |
Oleg Nesterov | ee0acf9 | 2006-01-08 01:03:53 -0800 | [diff] [blame] | 1027 | if (p != group_leader) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | goto out; |
| 1029 | } |
| 1030 | |
| 1031 | err = -EPERM; |
| 1032 | if (p->signal->leader) |
| 1033 | goto out; |
| 1034 | |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1035 | pgrp = task_pid(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | if (pgid != pid) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1037 | struct task_struct *g; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1039 | pgrp = find_vpid(pgid); |
| 1040 | g = pid_task(pgrp, PIDTYPE_PGID); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 1041 | if (!g || task_session(g) != task_session(group_leader)) |
Oleg Nesterov | f020bc4 | 2006-12-08 02:38:02 -0800 | [diff] [blame] | 1042 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | } |
| 1044 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | err = security_task_setpgid(p, pgid); |
| 1046 | if (err) |
| 1047 | goto out; |
| 1048 | |
Oleg Nesterov | 1b0f7ff | 2009-04-02 16:58:39 -0700 | [diff] [blame] | 1049 | if (task_pgrp(p) != pgrp) |
Oleg Nesterov | 83beaf3 | 2008-04-30 00:54:27 -0700 | [diff] [blame] | 1050 | change_pid(p, PIDTYPE_PGID, pgrp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
| 1052 | err = 0; |
| 1053 | out: |
| 1054 | /* All paths lead to here, thus we are safe. -DaveM */ |
| 1055 | write_unlock_irq(&tasklist_lock); |
Paul E. McKenney | 950eaac | 2010-08-31 17:00:18 -0700 | [diff] [blame] | 1056 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | return err; |
| 1058 | } |
| 1059 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 1060 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | { |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1062 | struct task_struct *p; |
| 1063 | struct pid *grp; |
| 1064 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1066 | rcu_read_lock(); |
| 1067 | if (!pid) |
| 1068 | grp = task_pgrp(current); |
| 1069 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | retval = -ESRCH; |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1071 | p = find_task_by_vpid(pid); |
| 1072 | if (!p) |
| 1073 | goto out; |
| 1074 | grp = task_pgrp(p); |
| 1075 | if (!grp) |
| 1076 | goto out; |
| 1077 | |
| 1078 | retval = security_task_getpgid(p); |
| 1079 | if (retval) |
| 1080 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | } |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1082 | retval = pid_vnr(grp); |
| 1083 | out: |
| 1084 | rcu_read_unlock(); |
| 1085 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | } |
| 1087 | |
| 1088 | #ifdef __ARCH_WANT_SYS_GETPGRP |
| 1089 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 1090 | SYSCALL_DEFINE0(getpgrp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | { |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1092 | return sys_getpgid(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | } |
| 1094 | |
| 1095 | #endif |
| 1096 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 1097 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | { |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1099 | struct task_struct *p; |
| 1100 | struct pid *sid; |
| 1101 | int retval; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1102 | |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1103 | rcu_read_lock(); |
| 1104 | if (!pid) |
| 1105 | sid = task_session(current); |
| 1106 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | retval = -ESRCH; |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1108 | p = find_task_by_vpid(pid); |
| 1109 | if (!p) |
| 1110 | goto out; |
| 1111 | sid = task_session(p); |
| 1112 | if (!sid) |
| 1113 | goto out; |
| 1114 | |
| 1115 | retval = security_task_getsid(p); |
| 1116 | if (retval) |
| 1117 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | } |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1119 | retval = pid_vnr(sid); |
| 1120 | out: |
| 1121 | rcu_read_unlock(); |
| 1122 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | } |
| 1124 | |
Heiko Carstens | b290ebe | 2009-01-14 14:14:06 +0100 | [diff] [blame] | 1125 | SYSCALL_DEFINE0(setsid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | { |
Oren Laadan | e19f247 | 2006-01-08 01:03:58 -0800 | [diff] [blame] | 1127 | struct task_struct *group_leader = current->group_leader; |
Oleg Nesterov | e4cc0a9 | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1128 | struct pid *sid = task_pid(group_leader); |
| 1129 | pid_t session = pid_vnr(sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | int err = -EPERM; |
| 1131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | write_lock_irq(&tasklist_lock); |
Eric W. Biederman | 390e2ff | 2006-03-31 02:31:33 -0800 | [diff] [blame] | 1133 | /* Fail if I am already a session leader */ |
| 1134 | if (group_leader->signal->leader) |
| 1135 | goto out; |
| 1136 | |
Oleg Nesterov | 430c623 | 2008-02-08 04:19:11 -0800 | [diff] [blame] | 1137 | /* Fail if a process group id already exists that equals the |
| 1138 | * proposed session id. |
Eric W. Biederman | 390e2ff | 2006-03-31 02:31:33 -0800 | [diff] [blame] | 1139 | */ |
Oleg Nesterov | 6806aac | 2008-02-08 04:19:12 -0800 | [diff] [blame] | 1140 | if (pid_task(sid, PIDTYPE_PGID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | goto out; |
| 1142 | |
Oren Laadan | e19f247 | 2006-01-08 01:03:58 -0800 | [diff] [blame] | 1143 | group_leader->signal->leader = 1; |
Oleg Nesterov | 8520d7c | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1144 | __set_special_pids(sid); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 1145 | |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 1146 | proc_clear_tty(group_leader); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 1147 | |
Oleg Nesterov | e4cc0a9 | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1148 | err = session; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | out: |
| 1150 | write_unlock_irq(&tasklist_lock); |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1151 | if (err > 0) { |
Christian Borntraeger | 0d0df59 | 2009-10-26 16:49:34 -0700 | [diff] [blame] | 1152 | proc_sid_connector(group_leader); |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1153 | sched_autogroup_create_attach(group_leader); |
| 1154 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | return err; |
| 1156 | } |
| 1157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | DECLARE_RWSEM(uts_sem); |
| 1159 | |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 1160 | #ifdef COMPAT_UTS_MACHINE |
| 1161 | #define override_architecture(name) \ |
Andreas Schwab | 46da276 | 2010-04-23 13:17:44 -0400 | [diff] [blame] | 1162 | (personality(current->personality) == PER_LINUX32 && \ |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 1163 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
| 1164 | sizeof(COMPAT_UTS_MACHINE))) |
| 1165 | #else |
| 1166 | #define override_architecture(name) 0 |
| 1167 | #endif |
| 1168 | |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1169 | /* |
| 1170 | * Work around broken programs that cannot handle "Linux 3.0". |
| 1171 | * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40 |
| 1172 | */ |
| 1173 | static int override_release(char __user *release, int len) |
| 1174 | { |
| 1175 | int ret = 0; |
Linus Torvalds | a84a79e | 2011-10-17 08:24:24 -0700 | [diff] [blame] | 1176 | char buf[65]; |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1177 | |
| 1178 | if (current->personality & UNAME26) { |
| 1179 | char *rest = UTS_RELEASE; |
| 1180 | int ndots = 0; |
| 1181 | unsigned v; |
| 1182 | |
| 1183 | while (*rest) { |
| 1184 | if (*rest == '.' && ++ndots >= 3) |
| 1185 | break; |
| 1186 | if (!isdigit(*rest) && *rest != '.') |
| 1187 | break; |
| 1188 | rest++; |
| 1189 | } |
| 1190 | v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40; |
| 1191 | snprintf(buf, len, "2.6.%u%s", v, rest); |
| 1192 | ret = copy_to_user(release, buf, len); |
| 1193 | } |
| 1194 | return ret; |
| 1195 | } |
| 1196 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1197 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | { |
| 1199 | int errno = 0; |
| 1200 | |
| 1201 | down_read(&uts_sem); |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 1202 | if (copy_to_user(name, utsname(), sizeof *name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | errno = -EFAULT; |
| 1204 | up_read(&uts_sem); |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 1205 | |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1206 | if (!errno && override_release(name->release, sizeof(name->release))) |
| 1207 | errno = -EFAULT; |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 1208 | if (!errno && override_architecture(name)) |
| 1209 | errno = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | return errno; |
| 1211 | } |
| 1212 | |
Christoph Hellwig | 5cacdb4 | 2010-03-10 15:21:21 -0800 | [diff] [blame] | 1213 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
| 1214 | /* |
| 1215 | * Old cruft |
| 1216 | */ |
| 1217 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) |
| 1218 | { |
| 1219 | int error = 0; |
| 1220 | |
| 1221 | if (!name) |
| 1222 | return -EFAULT; |
| 1223 | |
| 1224 | down_read(&uts_sem); |
| 1225 | if (copy_to_user(name, utsname(), sizeof(*name))) |
| 1226 | error = -EFAULT; |
| 1227 | up_read(&uts_sem); |
| 1228 | |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1229 | if (!error && override_release(name->release, sizeof(name->release))) |
| 1230 | error = -EFAULT; |
Christoph Hellwig | 5cacdb4 | 2010-03-10 15:21:21 -0800 | [diff] [blame] | 1231 | if (!error && override_architecture(name)) |
| 1232 | error = -EFAULT; |
| 1233 | return error; |
| 1234 | } |
| 1235 | |
| 1236 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) |
| 1237 | { |
| 1238 | int error; |
| 1239 | |
| 1240 | if (!name) |
| 1241 | return -EFAULT; |
| 1242 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) |
| 1243 | return -EFAULT; |
| 1244 | |
| 1245 | down_read(&uts_sem); |
| 1246 | error = __copy_to_user(&name->sysname, &utsname()->sysname, |
| 1247 | __OLD_UTS_LEN); |
| 1248 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); |
| 1249 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, |
| 1250 | __OLD_UTS_LEN); |
| 1251 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); |
| 1252 | error |= __copy_to_user(&name->release, &utsname()->release, |
| 1253 | __OLD_UTS_LEN); |
| 1254 | error |= __put_user(0, name->release + __OLD_UTS_LEN); |
| 1255 | error |= __copy_to_user(&name->version, &utsname()->version, |
| 1256 | __OLD_UTS_LEN); |
| 1257 | error |= __put_user(0, name->version + __OLD_UTS_LEN); |
| 1258 | error |= __copy_to_user(&name->machine, &utsname()->machine, |
| 1259 | __OLD_UTS_LEN); |
| 1260 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); |
| 1261 | up_read(&uts_sem); |
| 1262 | |
| 1263 | if (!error && override_architecture(name)) |
| 1264 | error = -EFAULT; |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1265 | if (!error && override_release(name->release, sizeof(name->release))) |
| 1266 | error = -EFAULT; |
Christoph Hellwig | 5cacdb4 | 2010-03-10 15:21:21 -0800 | [diff] [blame] | 1267 | return error ? -EFAULT : 0; |
| 1268 | } |
| 1269 | #endif |
| 1270 | |
Heiko Carstens | 5a8a82b | 2009-01-14 14:14:25 +0100 | [diff] [blame] | 1271 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | { |
| 1273 | int errno; |
| 1274 | char tmp[__NEW_UTS_LEN]; |
| 1275 | |
Serge E. Hallyn | bb96a6f | 2011-03-23 16:43:18 -0700 | [diff] [blame] | 1276 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | return -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | if (len < 0 || len > __NEW_UTS_LEN) |
| 1280 | return -EINVAL; |
| 1281 | down_write(&uts_sem); |
| 1282 | errno = -EFAULT; |
| 1283 | if (!copy_from_user(tmp, name, len)) { |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1284 | struct new_utsname *u = utsname(); |
| 1285 | |
| 1286 | memcpy(u->nodename, tmp, len); |
| 1287 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | errno = 0; |
| 1289 | } |
Lucas De Marchi | f1ecf06 | 2011-11-02 13:39:22 -0700 | [diff] [blame] | 1290 | uts_proc_notify(UTS_PROC_HOSTNAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | up_write(&uts_sem); |
| 1292 | return errno; |
| 1293 | } |
| 1294 | |
| 1295 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME |
| 1296 | |
Heiko Carstens | 5a8a82b | 2009-01-14 14:14:25 +0100 | [diff] [blame] | 1297 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | { |
| 1299 | int i, errno; |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1300 | struct new_utsname *u; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | |
| 1302 | if (len < 0) |
| 1303 | return -EINVAL; |
| 1304 | down_read(&uts_sem); |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1305 | u = utsname(); |
| 1306 | i = 1 + strlen(u->nodename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | if (i > len) |
| 1308 | i = len; |
| 1309 | errno = 0; |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1310 | if (copy_to_user(name, u->nodename, i)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | errno = -EFAULT; |
| 1312 | up_read(&uts_sem); |
| 1313 | return errno; |
| 1314 | } |
| 1315 | |
| 1316 | #endif |
| 1317 | |
| 1318 | /* |
| 1319 | * Only setdomainname; getdomainname can be implemented by calling |
| 1320 | * uname() |
| 1321 | */ |
Heiko Carstens | 5a8a82b | 2009-01-14 14:14:25 +0100 | [diff] [blame] | 1322 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | { |
| 1324 | int errno; |
| 1325 | char tmp[__NEW_UTS_LEN]; |
| 1326 | |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1327 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | return -EPERM; |
| 1329 | if (len < 0 || len > __NEW_UTS_LEN) |
| 1330 | return -EINVAL; |
| 1331 | |
| 1332 | down_write(&uts_sem); |
| 1333 | errno = -EFAULT; |
| 1334 | if (!copy_from_user(tmp, name, len)) { |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1335 | struct new_utsname *u = utsname(); |
| 1336 | |
| 1337 | memcpy(u->domainname, tmp, len); |
| 1338 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | errno = 0; |
| 1340 | } |
Lucas De Marchi | f1ecf06 | 2011-11-02 13:39:22 -0700 | [diff] [blame] | 1341 | uts_proc_notify(UTS_PROC_DOMAINNAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | up_write(&uts_sem); |
| 1343 | return errno; |
| 1344 | } |
| 1345 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1346 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | { |
Jiri Slaby | b951834 | 2010-05-04 11:28:25 +0200 | [diff] [blame] | 1348 | struct rlimit value; |
| 1349 | int ret; |
| 1350 | |
| 1351 | ret = do_prlimit(current, resource, NULL, &value); |
| 1352 | if (!ret) |
| 1353 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; |
| 1354 | |
| 1355 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | } |
| 1357 | |
| 1358 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT |
| 1359 | |
| 1360 | /* |
| 1361 | * Back compatibility for getrlimit. Needed for some apps. |
| 1362 | */ |
| 1363 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1364 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
| 1365 | struct rlimit __user *, rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | { |
| 1367 | struct rlimit x; |
| 1368 | if (resource >= RLIM_NLIMITS) |
| 1369 | return -EINVAL; |
| 1370 | |
| 1371 | task_lock(current->group_leader); |
| 1372 | x = current->signal->rlim[resource]; |
| 1373 | task_unlock(current->group_leader); |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 1374 | if (x.rlim_cur > 0x7FFFFFFF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | x.rlim_cur = 0x7FFFFFFF; |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 1376 | if (x.rlim_max > 0x7FFFFFFF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | x.rlim_max = 0x7FFFFFFF; |
| 1378 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; |
| 1379 | } |
| 1380 | |
| 1381 | #endif |
| 1382 | |
Jiri Slaby | c022a0a | 2010-05-04 18:03:50 +0200 | [diff] [blame] | 1383 | static inline bool rlim64_is_infinity(__u64 rlim64) |
| 1384 | { |
| 1385 | #if BITS_PER_LONG < 64 |
| 1386 | return rlim64 >= ULONG_MAX; |
| 1387 | #else |
| 1388 | return rlim64 == RLIM64_INFINITY; |
| 1389 | #endif |
| 1390 | } |
| 1391 | |
| 1392 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) |
| 1393 | { |
| 1394 | if (rlim->rlim_cur == RLIM_INFINITY) |
| 1395 | rlim64->rlim_cur = RLIM64_INFINITY; |
| 1396 | else |
| 1397 | rlim64->rlim_cur = rlim->rlim_cur; |
| 1398 | if (rlim->rlim_max == RLIM_INFINITY) |
| 1399 | rlim64->rlim_max = RLIM64_INFINITY; |
| 1400 | else |
| 1401 | rlim64->rlim_max = rlim->rlim_max; |
| 1402 | } |
| 1403 | |
| 1404 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) |
| 1405 | { |
| 1406 | if (rlim64_is_infinity(rlim64->rlim_cur)) |
| 1407 | rlim->rlim_cur = RLIM_INFINITY; |
| 1408 | else |
| 1409 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; |
| 1410 | if (rlim64_is_infinity(rlim64->rlim_max)) |
| 1411 | rlim->rlim_max = RLIM_INFINITY; |
| 1412 | else |
| 1413 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; |
| 1414 | } |
| 1415 | |
Jiri Slaby | 1c1e618 | 2009-08-28 14:08:17 +0200 | [diff] [blame] | 1416 | /* make sure you are allowed to change @tsk limits before calling this */ |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1417 | int do_prlimit(struct task_struct *tsk, unsigned int resource, |
| 1418 | struct rlimit *new_rlim, struct rlimit *old_rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | { |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1420 | struct rlimit *rlim; |
Jiri Slaby | 86f162f | 2009-11-14 17:37:04 +0100 | [diff] [blame] | 1421 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | |
| 1423 | if (resource >= RLIM_NLIMITS) |
| 1424 | return -EINVAL; |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1425 | if (new_rlim) { |
| 1426 | if (new_rlim->rlim_cur > new_rlim->rlim_max) |
| 1427 | return -EINVAL; |
| 1428 | if (resource == RLIMIT_NOFILE && |
| 1429 | new_rlim->rlim_max > sysctl_nr_open) |
| 1430 | return -EPERM; |
| 1431 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | |
Jiri Slaby | 1c1e618 | 2009-08-28 14:08:17 +0200 | [diff] [blame] | 1433 | /* protect tsk->signal and tsk->sighand from disappearing */ |
| 1434 | read_lock(&tasklist_lock); |
| 1435 | if (!tsk->sighand) { |
| 1436 | retval = -ESRCH; |
| 1437 | goto out; |
| 1438 | } |
| 1439 | |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1440 | rlim = tsk->signal->rlim + resource; |
Jiri Slaby | 86f162f | 2009-11-14 17:37:04 +0100 | [diff] [blame] | 1441 | task_lock(tsk->group_leader); |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1442 | if (new_rlim) { |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1443 | /* Keep the capable check against init_user_ns until |
| 1444 | cgroups can contain all limits */ |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1445 | if (new_rlim->rlim_max > rlim->rlim_max && |
| 1446 | !capable(CAP_SYS_RESOURCE)) |
| 1447 | retval = -EPERM; |
| 1448 | if (!retval) |
| 1449 | retval = security_task_setrlimit(tsk->group_leader, |
| 1450 | resource, new_rlim); |
| 1451 | if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { |
| 1452 | /* |
| 1453 | * The caller is asking for an immediate RLIMIT_CPU |
| 1454 | * expiry. But we use the zero value to mean "it was |
| 1455 | * never set". So let's cheat and make it one second |
| 1456 | * instead |
| 1457 | */ |
| 1458 | new_rlim->rlim_cur = 1; |
| 1459 | } |
Tom Alsberg | 9926e4c | 2007-05-08 00:30:31 -0700 | [diff] [blame] | 1460 | } |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1461 | if (!retval) { |
| 1462 | if (old_rlim) |
| 1463 | *old_rlim = *rlim; |
| 1464 | if (new_rlim) |
| 1465 | *rlim = *new_rlim; |
| 1466 | } |
Jiri Slaby | 7855c35 | 2009-08-26 23:45:34 +0200 | [diff] [blame] | 1467 | task_unlock(tsk->group_leader); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | |
Andrew Morton | d3561f7 | 2006-03-24 03:18:36 -0800 | [diff] [blame] | 1469 | /* |
| 1470 | * RLIMIT_CPU handling. Note that the kernel fails to return an error |
| 1471 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a |
| 1472 | * very long-standing error, and fixing it now risks breakage of |
| 1473 | * applications, so we live with it |
| 1474 | */ |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1475 | if (!retval && new_rlim && resource == RLIMIT_CPU && |
| 1476 | new_rlim->rlim_cur != RLIM_INFINITY) |
| 1477 | update_rlimit_cpu(tsk, new_rlim->rlim_cur); |
Andrew Morton | ec9e16b | 2006-03-24 03:18:34 -0800 | [diff] [blame] | 1478 | out: |
Jiri Slaby | 1c1e618 | 2009-08-28 14:08:17 +0200 | [diff] [blame] | 1479 | read_unlock(&tasklist_lock); |
Oleg Nesterov | 2fb9d26 | 2009-09-03 19:21:45 +0200 | [diff] [blame] | 1480 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | } |
| 1482 | |
Jiri Slaby | c022a0a | 2010-05-04 18:03:50 +0200 | [diff] [blame] | 1483 | /* rcu lock must be held */ |
| 1484 | static int check_prlimit_permission(struct task_struct *task) |
| 1485 | { |
| 1486 | const struct cred *cred = current_cred(), *tcred; |
| 1487 | |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1488 | if (current == task) |
| 1489 | return 0; |
Jiri Slaby | c022a0a | 2010-05-04 18:03:50 +0200 | [diff] [blame] | 1490 | |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1491 | tcred = __task_cred(task); |
| 1492 | if (cred->user->user_ns == tcred->user->user_ns && |
| 1493 | (cred->uid == tcred->euid && |
| 1494 | cred->uid == tcred->suid && |
| 1495 | cred->uid == tcred->uid && |
| 1496 | cred->gid == tcred->egid && |
| 1497 | cred->gid == tcred->sgid && |
| 1498 | cred->gid == tcred->gid)) |
| 1499 | return 0; |
| 1500 | if (ns_capable(tcred->user->user_ns, CAP_SYS_RESOURCE)) |
| 1501 | return 0; |
| 1502 | |
| 1503 | return -EPERM; |
Jiri Slaby | c022a0a | 2010-05-04 18:03:50 +0200 | [diff] [blame] | 1504 | } |
| 1505 | |
| 1506 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, |
| 1507 | const struct rlimit64 __user *, new_rlim, |
| 1508 | struct rlimit64 __user *, old_rlim) |
| 1509 | { |
| 1510 | struct rlimit64 old64, new64; |
| 1511 | struct rlimit old, new; |
| 1512 | struct task_struct *tsk; |
| 1513 | int ret; |
| 1514 | |
| 1515 | if (new_rlim) { |
| 1516 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) |
| 1517 | return -EFAULT; |
| 1518 | rlim64_to_rlim(&new64, &new); |
| 1519 | } |
| 1520 | |
| 1521 | rcu_read_lock(); |
| 1522 | tsk = pid ? find_task_by_vpid(pid) : current; |
| 1523 | if (!tsk) { |
| 1524 | rcu_read_unlock(); |
| 1525 | return -ESRCH; |
| 1526 | } |
| 1527 | ret = check_prlimit_permission(tsk); |
| 1528 | if (ret) { |
| 1529 | rcu_read_unlock(); |
| 1530 | return ret; |
| 1531 | } |
| 1532 | get_task_struct(tsk); |
| 1533 | rcu_read_unlock(); |
| 1534 | |
| 1535 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, |
| 1536 | old_rlim ? &old : NULL); |
| 1537 | |
| 1538 | if (!ret && old_rlim) { |
| 1539 | rlim_to_rlim64(&old, &old64); |
| 1540 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) |
| 1541 | ret = -EFAULT; |
| 1542 | } |
| 1543 | |
| 1544 | put_task_struct(tsk); |
| 1545 | return ret; |
| 1546 | } |
| 1547 | |
Jiri Slaby | 7855c35 | 2009-08-26 23:45:34 +0200 | [diff] [blame] | 1548 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
| 1549 | { |
| 1550 | struct rlimit new_rlim; |
| 1551 | |
| 1552 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
| 1553 | return -EFAULT; |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1554 | return do_prlimit(current, resource, &new_rlim, NULL); |
Jiri Slaby | 7855c35 | 2009-08-26 23:45:34 +0200 | [diff] [blame] | 1555 | } |
| 1556 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | /* |
| 1558 | * It would make sense to put struct rusage in the task_struct, |
| 1559 | * except that would make the task_struct be *really big*. After |
| 1560 | * task_struct gets moved into malloc'ed memory, it would |
| 1561 | * make sense to do this. It will make moving the rest of the information |
| 1562 | * a lot simpler! (Which we're not doing right now because we're not |
| 1563 | * measuring them yet). |
| 1564 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
| 1566 | * races with threads incrementing their own counters. But since word |
| 1567 | * reads are atomic, we either get new values or old values and we don't |
| 1568 | * care which for the sums. We always take the siglock to protect reading |
| 1569 | * the c* fields from p->signal from races with exit.c updating those |
| 1570 | * fields when reaping, so a sample either gets all the additions of a |
| 1571 | * 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] | 1572 | * |
Ravikiran G Thirumalai | de047c1 | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1573 | * Locking: |
| 1574 | * We need to take the siglock for CHILDEREN, SELF and BOTH |
| 1575 | * for the cases current multithreaded, non-current single threaded |
| 1576 | * non-current multithreaded. Thread traversal is now safe with |
| 1577 | * the siglock held. |
| 1578 | * Strictly speaking, we donot need to take the siglock if we are current and |
| 1579 | * single threaded, as no one else can take our signal_struct away, no one |
| 1580 | * else can reap the children to update signal->c* counters, and no one else |
| 1581 | * can race with the signal-> fields. If we do not take any lock, the |
| 1582 | * signal-> fields could be read out of order while another thread was just |
| 1583 | * exiting. So we should place a read memory barrier when we avoid the lock. |
| 1584 | * On the writer side, write memory barrier is implied in __exit_signal |
| 1585 | * as __exit_signal releases the siglock spinlock after updating the signal-> |
| 1586 | * 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] | 1587 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | */ |
| 1589 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1590 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1591 | { |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1592 | r->ru_nvcsw += t->nvcsw; |
| 1593 | r->ru_nivcsw += t->nivcsw; |
| 1594 | r->ru_minflt += t->min_flt; |
| 1595 | r->ru_majflt += t->maj_flt; |
| 1596 | r->ru_inblock += task_io_get_inblock(t); |
| 1597 | r->ru_oublock += task_io_get_oublock(t); |
| 1598 | } |
| 1599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
| 1601 | { |
| 1602 | struct task_struct *t; |
| 1603 | unsigned long flags; |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 1604 | cputime_t tgutime, tgstime, utime, stime; |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1605 | unsigned long maxrss = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | |
| 1607 | memset((char *) r, 0, sizeof *r); |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1608 | utime = stime = cputime_zero; |
| 1609 | |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1610 | if (who == RUSAGE_THREAD) { |
Hidetoshi Seto | d180c5b | 2009-11-26 14:48:30 +0900 | [diff] [blame] | 1611 | task_times(current, &utime, &stime); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1612 | accumulate_thread_rusage(p, r); |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1613 | maxrss = p->signal->maxrss; |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1614 | goto out; |
| 1615 | } |
| 1616 | |
Oleg Nesterov | d6cf723 | 2008-04-30 00:52:38 -0700 | [diff] [blame] | 1617 | if (!lock_task_sighand(p, &flags)) |
Ravikiran G Thirumalai | de047c1 | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1618 | return; |
Ravikiran G Thirumalai | 2dd0ebc | 2006-03-23 03:00:13 -0800 | [diff] [blame] | 1619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | switch (who) { |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1621 | case RUSAGE_BOTH: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | case RUSAGE_CHILDREN: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | utime = p->signal->cutime; |
| 1624 | stime = p->signal->cstime; |
| 1625 | r->ru_nvcsw = p->signal->cnvcsw; |
| 1626 | r->ru_nivcsw = p->signal->cnivcsw; |
| 1627 | r->ru_minflt = p->signal->cmin_flt; |
| 1628 | r->ru_majflt = p->signal->cmaj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 1629 | r->ru_inblock = p->signal->cinblock; |
| 1630 | r->ru_oublock = p->signal->coublock; |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1631 | maxrss = p->signal->cmaxrss; |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1632 | |
| 1633 | if (who == RUSAGE_CHILDREN) |
| 1634 | break; |
| 1635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | case RUSAGE_SELF: |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 1637 | thread_group_times(p, &tgutime, &tgstime); |
| 1638 | utime = cputime_add(utime, tgutime); |
| 1639 | stime = cputime_add(stime, tgstime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | r->ru_nvcsw += p->signal->nvcsw; |
| 1641 | r->ru_nivcsw += p->signal->nivcsw; |
| 1642 | r->ru_minflt += p->signal->min_flt; |
| 1643 | r->ru_majflt += p->signal->maj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 1644 | r->ru_inblock += p->signal->inblock; |
| 1645 | r->ru_oublock += p->signal->oublock; |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1646 | if (maxrss < p->signal->maxrss) |
| 1647 | maxrss = p->signal->maxrss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | t = p; |
| 1649 | do { |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1650 | accumulate_thread_rusage(t, r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | t = next_thread(t); |
| 1652 | } while (t != p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | break; |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | default: |
| 1656 | BUG(); |
| 1657 | } |
Ravikiran G Thirumalai | de047c1 | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1658 | unlock_task_sighand(p, &flags); |
Ravikiran G Thirumalai | de047c1 | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1659 | |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1660 | out: |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1661 | cputime_to_timeval(utime, &r->ru_utime); |
| 1662 | cputime_to_timeval(stime, &r->ru_stime); |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1663 | |
| 1664 | if (who != RUSAGE_CHILDREN) { |
| 1665 | struct mm_struct *mm = get_task_mm(p); |
| 1666 | if (mm) { |
| 1667 | setmax_mm_hiwater_rss(&maxrss, mm); |
| 1668 | mmput(mm); |
| 1669 | } |
| 1670 | } |
| 1671 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | } |
| 1673 | |
| 1674 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) |
| 1675 | { |
| 1676 | struct rusage r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | k_getrusage(p, who, &r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
| 1679 | } |
| 1680 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1681 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | { |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1683 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
| 1684 | who != RUSAGE_THREAD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | return -EINVAL; |
| 1686 | return getrusage(current, who, ru); |
| 1687 | } |
| 1688 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1689 | SYSCALL_DEFINE1(umask, int, mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | { |
| 1691 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); |
| 1692 | return mask; |
| 1693 | } |
Serge E. Hallyn | 3b7391d | 2008-02-04 22:29:45 -0800 | [diff] [blame] | 1694 | |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 1695 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
| 1696 | unsigned long, arg4, unsigned long, arg5) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | { |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1698 | struct task_struct *me = current; |
| 1699 | unsigned char comm[sizeof(me->comm)]; |
| 1700 | long error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1702 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
| 1703 | if (error != -ENOSYS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | return error; |
| 1705 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1706 | error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | switch (option) { |
| 1708 | case PR_SET_PDEATHSIG: |
Jesper Juhl | 0730ded | 2005-09-06 15:17:37 -0700 | [diff] [blame] | 1709 | if (!valid_signal(arg2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | error = -EINVAL; |
| 1711 | break; |
| 1712 | } |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1713 | me->pdeath_signal = arg2; |
| 1714 | error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | break; |
| 1716 | case PR_GET_PDEATHSIG: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1717 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | break; |
| 1719 | case PR_GET_DUMPABLE: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1720 | error = get_dumpable(me->mm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | break; |
| 1722 | case PR_SET_DUMPABLE: |
Marcel Holtmann | abf75a5 | 2006-07-12 13:12:00 +0200 | [diff] [blame] | 1723 | if (arg2 < 0 || arg2 > 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | error = -EINVAL; |
| 1725 | break; |
| 1726 | } |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1727 | set_dumpable(me->mm, arg2); |
| 1728 | error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | break; |
| 1730 | |
| 1731 | case PR_SET_UNALIGN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1732 | error = SET_UNALIGN_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | break; |
| 1734 | case PR_GET_UNALIGN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1735 | error = GET_UNALIGN_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | break; |
| 1737 | case PR_SET_FPEMU: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1738 | error = SET_FPEMU_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | break; |
| 1740 | case PR_GET_FPEMU: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1741 | error = GET_FPEMU_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | break; |
| 1743 | case PR_SET_FPEXC: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1744 | error = SET_FPEXC_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | break; |
| 1746 | case PR_GET_FPEXC: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1747 | error = GET_FPEXC_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | break; |
| 1749 | case PR_GET_TIMING: |
| 1750 | error = PR_TIMING_STATISTICAL; |
| 1751 | break; |
| 1752 | case PR_SET_TIMING: |
Shi Weihua | 7b26655 | 2008-05-23 13:04:59 -0700 | [diff] [blame] | 1753 | if (arg2 != PR_TIMING_STATISTICAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | error = -EINVAL; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1755 | else |
| 1756 | error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | break; |
| 1758 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1759 | case PR_SET_NAME: |
| 1760 | comm[sizeof(me->comm)-1] = 0; |
| 1761 | if (strncpy_from_user(comm, (char __user *)arg2, |
| 1762 | sizeof(me->comm) - 1) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | return -EFAULT; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1764 | set_task_comm(me, comm); |
Vladimir Zapolskiy | f786ecb | 2011-09-21 09:26:44 +0000 | [diff] [blame] | 1765 | proc_comm_connector(me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | return 0; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1767 | case PR_GET_NAME: |
| 1768 | get_task_comm(comm, me); |
| 1769 | if (copy_to_user((char __user *)arg2, comm, |
| 1770 | sizeof(comm))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | return -EFAULT; |
| 1772 | return 0; |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 1773 | case PR_GET_ENDIAN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1774 | error = GET_ENDIAN(me, arg2); |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 1775 | break; |
| 1776 | case PR_SET_ENDIAN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1777 | error = SET_ENDIAN(me, arg2); |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 1778 | break; |
| 1779 | |
Andrea Arcangeli | 1d9d02f | 2007-07-15 23:41:32 -0700 | [diff] [blame] | 1780 | case PR_GET_SECCOMP: |
| 1781 | error = prctl_get_seccomp(); |
| 1782 | break; |
| 1783 | case PR_SET_SECCOMP: |
| 1784 | error = prctl_set_seccomp(arg2); |
| 1785 | break; |
Erik Bosman | 8fb402b | 2008-04-11 18:54:17 +0200 | [diff] [blame] | 1786 | case PR_GET_TSC: |
| 1787 | error = GET_TSC_CTL(arg2); |
| 1788 | break; |
| 1789 | case PR_SET_TSC: |
| 1790 | error = SET_TSC_CTL(arg2); |
| 1791 | break; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1792 | case PR_TASK_PERF_EVENTS_DISABLE: |
| 1793 | error = perf_event_task_disable(); |
Ingo Molnar | 1d1c7dd | 2008-12-11 14:59:31 +0100 | [diff] [blame] | 1794 | break; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1795 | case PR_TASK_PERF_EVENTS_ENABLE: |
| 1796 | error = perf_event_task_enable(); |
Ingo Molnar | 1d1c7dd | 2008-12-11 14:59:31 +0100 | [diff] [blame] | 1797 | break; |
Arjan van de Ven | 6976675 | 2008-09-01 15:52:40 -0700 | [diff] [blame] | 1798 | case PR_GET_TIMERSLACK: |
| 1799 | error = current->timer_slack_ns; |
| 1800 | break; |
| 1801 | case PR_SET_TIMERSLACK: |
| 1802 | if (arg2 <= 0) |
| 1803 | current->timer_slack_ns = |
| 1804 | current->default_timer_slack_ns; |
| 1805 | else |
| 1806 | current->timer_slack_ns = arg2; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1807 | error = 0; |
Arjan van de Ven | 6976675 | 2008-09-01 15:52:40 -0700 | [diff] [blame] | 1808 | break; |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1809 | case PR_MCE_KILL: |
| 1810 | if (arg4 | arg5) |
| 1811 | return -EINVAL; |
| 1812 | switch (arg2) { |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 1813 | case PR_MCE_KILL_CLEAR: |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1814 | if (arg3 != 0) |
| 1815 | return -EINVAL; |
| 1816 | current->flags &= ~PF_MCE_PROCESS; |
| 1817 | break; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 1818 | case PR_MCE_KILL_SET: |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1819 | current->flags |= PF_MCE_PROCESS; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 1820 | if (arg3 == PR_MCE_KILL_EARLY) |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1821 | current->flags |= PF_MCE_EARLY; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 1822 | else if (arg3 == PR_MCE_KILL_LATE) |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1823 | current->flags &= ~PF_MCE_EARLY; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 1824 | else if (arg3 == PR_MCE_KILL_DEFAULT) |
| 1825 | current->flags &= |
| 1826 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); |
| 1827 | else |
| 1828 | return -EINVAL; |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1829 | break; |
| 1830 | default: |
| 1831 | return -EINVAL; |
| 1832 | } |
| 1833 | error = 0; |
| 1834 | break; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 1835 | case PR_MCE_KILL_GET: |
| 1836 | if (arg2 | arg3 | arg4 | arg5) |
| 1837 | return -EINVAL; |
| 1838 | if (current->flags & PF_MCE_PROCESS) |
| 1839 | error = (current->flags & PF_MCE_EARLY) ? |
| 1840 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; |
| 1841 | else |
| 1842 | error = PR_MCE_KILL_DEFAULT; |
| 1843 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | default: |
| 1845 | error = -EINVAL; |
| 1846 | break; |
| 1847 | } |
| 1848 | return error; |
| 1849 | } |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 1850 | |
Heiko Carstens | 836f92a | 2009-01-14 14:14:33 +0100 | [diff] [blame] | 1851 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
| 1852 | struct getcpu_cache __user *, unused) |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 1853 | { |
| 1854 | int err = 0; |
| 1855 | int cpu = raw_smp_processor_id(); |
| 1856 | if (cpup) |
| 1857 | err |= put_user(cpu, cpup); |
| 1858 | if (nodep) |
| 1859 | err |= put_user(cpu_to_node(cpu), nodep); |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 1860 | return err ? -EFAULT : 0; |
| 1861 | } |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 1862 | |
| 1863 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; |
| 1864 | |
Neil Horman | a06a4dc | 2010-05-26 14:42:58 -0700 | [diff] [blame] | 1865 | static void argv_cleanup(struct subprocess_info *info) |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 1866 | { |
Neil Horman | a06a4dc | 2010-05-26 14:42:58 -0700 | [diff] [blame] | 1867 | argv_free(info->argv); |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 1868 | } |
| 1869 | |
| 1870 | /** |
| 1871 | * orderly_poweroff - Trigger an orderly system poweroff |
| 1872 | * @force: force poweroff if command execution fails |
| 1873 | * |
| 1874 | * This may be called from any context to trigger a system shutdown. |
| 1875 | * If the orderly shutdown fails, it will force an immediate shutdown. |
| 1876 | */ |
| 1877 | int orderly_poweroff(bool force) |
| 1878 | { |
| 1879 | int argc; |
| 1880 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); |
| 1881 | static char *envp[] = { |
| 1882 | "HOME=/", |
| 1883 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", |
| 1884 | NULL |
| 1885 | }; |
| 1886 | int ret = -ENOMEM; |
| 1887 | struct subprocess_info *info; |
| 1888 | |
| 1889 | if (argv == NULL) { |
| 1890 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", |
| 1891 | __func__, poweroff_cmd); |
| 1892 | goto out; |
| 1893 | } |
| 1894 | |
KOSAKI Motohiro | ac331d1 | 2008-07-25 01:45:38 -0700 | [diff] [blame] | 1895 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 1896 | if (info == NULL) { |
| 1897 | argv_free(argv); |
| 1898 | goto out; |
| 1899 | } |
| 1900 | |
Neil Horman | a06a4dc | 2010-05-26 14:42:58 -0700 | [diff] [blame] | 1901 | call_usermodehelper_setfns(info, NULL, argv_cleanup, NULL); |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 1902 | |
Jeremy Fitzhardinge | 86313c4 | 2007-07-17 18:37:03 -0700 | [diff] [blame] | 1903 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 1904 | |
| 1905 | out: |
| 1906 | if (ret && force) { |
| 1907 | printk(KERN_WARNING "Failed to start orderly shutdown: " |
| 1908 | "forcing the issue\n"); |
| 1909 | |
| 1910 | /* I guess this should try to kick off some daemon to |
| 1911 | sync and poweroff asap. Or not even bother syncing |
| 1912 | if we're doing an emergency shutdown? */ |
| 1913 | emergency_sync(); |
| 1914 | kernel_power_off(); |
| 1915 | } |
| 1916 | |
| 1917 | return ret; |
| 1918 | } |
| 1919 | EXPORT_SYMBOL_GPL(orderly_poweroff); |