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| author | Eric W. Biederman <ebiederm@xmission.com> | 2006-03-16 10:31:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-17 07:46:59 -0800 |
| commit | e0e8eb54d8ae0c4cfd1d297f6351b08a7f635c5f (patch) | |
| tree | e6f6442aca13fe9d20d149ed9b414f038d90778f /kernel/fork.c | |
| parent | 232a347a444e687b5f8cf0f6485704db1c6024d3 (diff) | |
| download | lwn-e0e8eb54d8ae0c4cfd1d297f6351b08a7f635c5f.tar.gz lwn-e0e8eb54d8ae0c4cfd1d297f6351b08a7f635c5f.zip | |
[PATCH] unshare: Use rcu_assign_pointer when setting sighand
The sighand pointer only needs the rcu_read_lock on the
read side. So only depending on task_lock protection
when setting this pointer is not enough. We also need
a memory barrier to ensure the initialization is seen first.
Use rcu_assign_pointer as it does this for us, and clearly
documents that we are setting an rcu readable pointer.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index ccdfbb16c86d..46060cb24af0 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1569,7 +1569,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags) if (new_sigh) { sigh = current->sighand; - current->sighand = new_sigh; + rcu_assign_pointer(current->sighand, new_sigh); new_sigh = sigh; } |