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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2010-02-22 12:44:16 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-02-22 19:50:34 -0800 |
| commit | 701188374b6f1ef9cf7e4dce4a2e69ef4c0012ac (patch) | |
| tree | f716e33bde324c74553a8d0b2acfb70d8ca3f1cc | |
| parent | 5a2d41961dd6815b874b5c0afec0ac96cd90eea4 (diff) | |
| download | linux-701188374b6f1ef9cf7e4dce4a2e69ef4c0012ac.tar.gz | |
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>
| -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) if (which > PRIO_USER || which < PRIO_PROCESS) return -EINVAL; + rcu_read_lock(); read_lock(&tasklist_lock); switch (which) { case PRIO_PROCESS: @@ -267,6 +268,7 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who) } out_unlock: read_unlock(&tasklist_lock); + rcu_read_unlock(); return retval; } |