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ovl: ignore permissions on underlying lookup 

Generally permission checking is not necessary when overlayfs looks up a
dentry on one of the underlying layers, since search permission on base
directory was already checked in ovl_permission().

More specifically using lookup_one_len() causes a problem when the lower
directory lacks search permission for a specific user while the upper
directory does have search permission.  Since lookups are cached, this
causes inconsistency in behavior: success depends on who did the first
lookup.

So instead use lookup_hash() which doesn't do the permission check.

Reported-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2016-05-11 01:16:37 +02:00 committed by Al Viro
parent 3c9fe8cdff
commit 38b78a5f18
1 changed files with 1 additions and 3 deletions
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4
fs/overlayfs/super.c
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@ -411,9 +411,7 @@ static inline struct dentry *ovl_lookup_real(struct dentry *dir,
{
struct dentry *dentry;
inode_lock(dir->d_inode);
dentry = lookup_one_len(name->name, dir, name->len);
inode_unlock(dir->d_inode);
dentry = lookup_hash(name, dir);
if (IS_ERR(dentry)) {
if (PTR_ERR(dentry) == -ENOENT)