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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2010-02-22 21:44:16 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2010-02-23 04:50:34 +0100
commit701188374b6f1ef9cf7e4dce4a2e69ef4c0012ac (patch)
treef716e33bde324c74553a8d0b2acfb70d8ca3f1cc
parentmemcg: fix oom killing a child process in an other cgroup (diff)
downloadlinux-701188374b6f1ef9cf7e4dce4a2e69ef4c0012ac.tar.xz
linux-701188374b6f1ef9cf7e4dce4a2e69ef4c0012ac.zip
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.c2
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;
}