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afs: Ignore AFS_ACE_READ and AFS_ACE_WRITE for directories 

The AFS_ACE_READ and AFS_ACE_WRITE permission bits should not
be used to make access decisions for the directory itself.  They
are meant to control access for the objects contained in that
directory.

Reading a directory is allowed if the AFS_ACE_LOOKUP bit is set.
This would cause an incorrect access denied error for a directory
with AFS_ACE_LOOKUP but not AFS_ACE_READ.

The AFS_ACE_WRITE bit does not allow operations that modify the
directory.  For a directory with AFS_ACE_WRITE but neither
AFS_ACE_INSERT nor AFS_ACE_DELETE, this would result in trying
operations that would ultimately be denied by the server.

Signed-off-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Marc Dionne 2017-07-06 15:50:18 +01:00 committed by Linus Torvalds
parent f991af3daa
commit fd2498211a
1 changed files with 2 additions and 3 deletions
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5
fs/afs/security.c
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@ -327,12 +327,11 @@ int afs_permission(struct inode *inode, int mask)
if (!(access & AFS_ACE_LOOKUP))
goto permission_denied;
} else if (mask & MAY_READ) {
if (!(access & AFS_ACE_READ))
if (!(access & AFS_ACE_LOOKUP))
goto permission_denied;
} else if (mask & MAY_WRITE) {
if (!(access & (AFS_ACE_DELETE | /* rmdir, unlink, rename from */
AFS_ACE_INSERT | /* create, mkdir, symlink, rename to */
AFS_ACE_WRITE))) /* chmod */
AFS_ACE_INSERT))) /* create, mkdir, symlink, rename to */
goto permission_denied;
} else {
BUG();