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afs: Adjust mode bits processing

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Mode bits for an afs file should not be enforced in the usual
way.

For files, the absence of user bits can restrict file access
with respect to what is granted by the server.

These bits apply regardless of the owner or the current uid; the
rest of the mode bits (group, other) are ignored.

Signed-off-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Marc Dionne 2017-03-16 16:27:44 +00:00 committed by David Howells
parent 6186f0788b
commit 627f46943f
1 changed files with 6 additions and 1 deletions
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7
fs/afs/security.c
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@ -340,17 +340,22 @@ int afs_permission(struct inode *inode, int mask)
} else {
if (!(access & AFS_ACE_LOOKUP))
goto permission_denied;
if ((mask & MAY_EXEC) && !(inode->i_mode & S_IXUSR))
goto permission_denied;
if (mask & (MAY_EXEC | MAY_READ)) {
if (!(access & AFS_ACE_READ))
goto permission_denied;
if (!(inode->i_mode & S_IRUSR))
goto permission_denied;
} else if (mask & MAY_WRITE) {
if (!(access & AFS_ACE_WRITE))
goto permission_denied;
if (!(inode->i_mode & S_IWUSR))
goto permission_denied;
}
}
key_put(key);
ret = generic_permission(inode, mask);
_leave(" = %d", ret);
return ret;