This is a note to let you know that I've just added the patch titled
afs: Adjust mode bits processing
to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: afs-adjust-mode-bits-processing.patch and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Dec 18 15:03:25 CET 2017
From: Marc Dionne marc.dionne@auristor.com Date: Thu, 16 Mar 2017 16:27:44 +0000 Subject: afs: Adjust mode bits processing
From: Marc Dionne marc.dionne@auristor.com
[ Upstream commit 627f46943ff90bcc32ddeb675d881c043c6fa2ae ]
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 Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/afs/security.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/fs/afs/security.c +++ b/fs/afs/security.c @@ -340,17 +340,22 @@ int afs_permission(struct inode *inode, } 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;
Patches currently in stable-queue which might be from marc.dionne@auristor.com are
queue-3.18/afs-populate-group-id-from-vnode-status.patch queue-3.18/afs-adjust-mode-bits-processing.patch queue-3.18/afs-populate-and-use-client-modification-time.patch