The following seems to fix it, but I need to exercise this a bit more to
be 100% certain it is rock solid:
diff --git a/fs/fs_struct.c b/fs/fs_struct.c
index 7dca743..cd7175e2 100644
--- a/fs/fs_struct.c
+++ b/fs/fs_struct.c
@@ -98,8 +98,10 @@ void exit_fs(struct task_struct *tsk)
int kill;
task_lock(tsk);
spin_lock(&fs->lock);
+ rcu_read_lock();
tsk->fs = NULL;
kill = !--fs->users;
+ rcu_read_unlock();
spin_unlock(&fs->lock);
task_unlock(tsk);
if (kill)
--
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1672819
Title:
exec'ing a setuid binary from a threaded program sometimes fails to
setuid
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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1672819/+subscriptions
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