From: Chris Coulson chris.coulson@canonical.com
[ Upstream commit 201218e4d3dfa1346e30997f48725acce3f26d01 ]
Although the apparmorfs dentries are always dropped from the dentry cache when the usage count drops to zero, there is no guarantee that this will happen in aafs_remove(), as another thread might still be using it. In this scenario, this means that the dentry will temporarily continue to appear in the results of lookups, even after the call to aafs_remove().
In the case of removal of a profile - it also causes simple_rmdir() on the profile directory to fail, as the directory won't be empty until the usage counts of all child dentries have decreased to zero. This results in the dentry for the profile directory leaking and appearing empty in the file system tree forever.
Signed-off-by: Chris Coulson chris.coulson@canonical.com Signed-off-by: John Johansen john.johansen@canonical.com Signed-off-by: Sasha Levin sashal@kernel.org --- security/apparmor/apparmorfs.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c index 40e3a098f6fb5..d95a7e41a29d4 100644 --- a/security/apparmor/apparmorfs.c +++ b/security/apparmor/apparmorfs.c @@ -361,6 +361,7 @@ static void aafs_remove(struct dentry *dentry) simple_rmdir(dir, dentry); else simple_unlink(dir, dentry); + d_delete(dentry); dput(dentry); } inode_unlock(dir);