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authorMiklos Szeredi <miklos@szeredi.hu>2005-07-07 17:57:24 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-07 18:23:51 -0700
commit1ce88cf466f7b6078b14d67d186a3d7c19dd5609 (patch)
treeb9716f3a71e3285a998da9614cfbc132ca605542 /include/linux/namespace.h
parent202322e6f7cd12e82b5ff0fa92bbdf517fcf0947 (diff)
downloadlwn-1ce88cf466f7b6078b14d67d186a3d7c19dd5609.tar.gz
lwn-1ce88cf466f7b6078b14d67d186a3d7c19dd5609.zip
[PATCH] namespace.c: fix race in mark_mounts_for_expiry()
This patch fixes a race found by Ram in mark_mounts_for_expiry() in fs/namespace.c. The bug can only be triggered with simultaneous exiting of a process having a private namespace, and expiry of a mount from within that namespace. It's practically impossible to trigger, and I haven't even tried. But still, a bug is a bug. The race happens when put_namespace() is called by another task, while mark_mounts_for_expiry() is between atomic_read() and get_namespace(). In that case get_namespace() will be called on an already dead namespace with unforeseeable results. The solution was suggested by Al Viro, with his own words: Instead of screwing with atomic_read() in there, why don't we simply do the following: a) atomic_dec_and_lock() in put_namespace() b) __put_namespace() called without dropping lock c) the first thing done by __put_namespace would be struct vfsmount *root = namespace->root; namespace->root = NULL; spin_unlock(...); .... umount_tree(root); ... d) check in mark_... would be simply namespace && namespace->root. And we are all set; no screwing around with atomic_read(), no magic at all. Dying namespace gets NULL ->root. All changes of ->root happen under spinlock. If under a spinlock we see non-NULL ->mnt_namespace, it won't be freed until we drop the lock (we will set ->mnt_namespace to NULL under that lock before we get to freeing namespace). If under a spinlock we see non-NULL ->mnt_namespace and ->mnt_namespace->root, we can grab a reference to namespace and be sure that it won't go away. Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Acked-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk> Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/namespace.h')
-rw-r--r--include/linux/namespace.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/namespace.h b/include/linux/namespace.h
index 697991b69f9b..0e5a86f13b2f 100644
--- a/include/linux/namespace.h
+++ b/include/linux/namespace.h
@@ -17,7 +17,8 @@ extern void __put_namespace(struct namespace *namespace);
static inline void put_namespace(struct namespace *namespace)
{
- if (atomic_dec_and_test(&namespace->count))
+ if (atomic_dec_and_lock(&namespace->count, &vfsmount_lock))
+ /* releases vfsmount_lock */
__put_namespace(namespace);
}