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fs/9p: only translate RWX permissions for plain 9P2000 

[ Upstream commit cd25e15e57 ]

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@zhasha.com>
Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Joakim Sindholt 2024-03-18 12:22:31 +01:00 committed by Greg Kroah-Hartman
parent 19e8d8df9c
commit df1962a199
1 changed files with 1 additions and 1 deletions
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fs/9p/vfs_inode.c
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@ -86,7 +86,7 @@ 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;