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| author | Frank Filz <ffilzlnx@us.ibm.com> | 2009-05-18 17:41:40 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-05-18 20:11:12 -0700 |
| commit | 7ee2cb7f32b299c2b06a31fde155457203e4b7dd (patch) | |
| tree | ca8ef4015ad1e80325df02dcd4ecfe261e1a4f9f | |
| parent | 363383277081ce831642b72df40932ee05ce40a2 (diff) | |
| download | linux-7ee2cb7f32b299c2b06a31fde155457203e4b7dd.tar.bz2 | |
nfs: Fix NFS v4 client handling of MAY_EXEC in nfs_permission.
The problem is that permission checking is skipped if atomic open is
possible, but when exec opens a file, it just opens it O_READONLY which
means EXEC permission will not be checked at that time.
This problem is observed by the following sequence (executed as root):
mount -t nfs4 server:/ /mnt4
echo "ls" >/mnt4/foo
chmod 744 /mnt4/foo
su guest -c "mnt4/foo"
Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
Tested-by: Eugene Teo <eugeneteo@kernel.sg>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/nfs/dir.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 370b190a09d1..89f98e9a024b 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1943,7 +1943,8 @@ int nfs_permission(struct inode *inode, int mask) case S_IFREG: /* NFSv4 has atomic_open... */ if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) - && (mask & MAY_OPEN)) + && (mask & MAY_OPEN) + && !(mask & MAY_EXEC)) goto out; break; case S_IFDIR: |