This is a note to let you know that I've just added the patch titled
fs/9p: only translate RWX permissions for plain 9P2000
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-9p-only-translate-rwx-permissions-for-plain-9p200.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7c911292360e89b8492ab45e081ec145b6e82d9a
Author: Joakim Sindholt <opensource@xxxxxxxxxx>
Date: Mon Mar 18 12:22:31 2024 +0100
fs/9p: only translate RWX permissions for plain 9P2000
[ Upstream commit cd25e15e57e68a6b18dc9323047fe9c68b99290b ]
Garbage in plain 9P2000's perm bits is allowed through, which causes it
to be able to set (among others) the suid bit. This was presumably not
the intent since the unix extended bits are handled explicitly and
conditionally on .u.
Signed-off-by: Joakim Sindholt <opensource@xxxxxxxxxx>
Signed-off-by: Eric Van Hensbergen <ericvh@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 5e2657c1dbbe6..a0c5a372dcf62 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -85,7 +85,7 @@ static int p9mode2perm(struct v9fs_session_info *v9ses,
int res;
int mode = stat->mode;
- res = mode & S_IALLUGO;
+ res = mode & 0777; /* S_IRWXUGO */
if (v9fs_proto_dotu(v9ses)) {
if ((mode & P9_DMSETUID) == P9_DMSETUID)
res |= S_ISUID;
