diff options
author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2010-02-22 15:44:16 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-02-22 22:50:34 -0500 |
commit | 701188374b6f1ef9cf7e4dce4a2e69ef4c0012ac (patch) | |
tree | f716e33bde324c74553a8d0b2acfb70d8ca3f1cc /kernel | |
parent | 5a2d41961dd6815b874b5c0afec0ac96cd90eea4 (diff) |
kernel/sys.c: fix missing rcu protection for sys_getpriority()
find_task_by_vpid() is not safe without rcu_read_lock(). 2.6.33-rc7 got
RCU protection for sys_setpriority() but missed it for sys_getpriority().
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/sys.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index 26a6b73a6b85..18bde979f346 100644 --- a/kernel/sys.c +++ b/kernel/sys.c | |||
@@ -222,6 +222,7 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who) | |||
222 | if (which > PRIO_USER || which < PRIO_PROCESS) | 222 | if (which > PRIO_USER || which < PRIO_PROCESS) |
223 | return -EINVAL; | 223 | return -EINVAL; |
224 | 224 | ||
225 | rcu_read_lock(); | ||
225 | read_lock(&tasklist_lock); | 226 | read_lock(&tasklist_lock); |
226 | switch (which) { | 227 | switch (which) { |
227 | case PRIO_PROCESS: | 228 | case PRIO_PROCESS: |
@@ -267,6 +268,7 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who) | |||
267 | } | 268 | } |
268 | out_unlock: | 269 | out_unlock: |
269 | read_unlock(&tasklist_lock); | 270 | read_unlock(&tasklist_lock); |
271 | rcu_read_unlock(); | ||
270 | 272 | ||
271 | return retval; | 273 | return retval; |
272 | } | 274 | } |