From 5a605930e19f451294bd838754f7d66c976a8a2c Mon Sep 17 00:00:00 2001 From: Joakim Sindholt Date: Mon, 18 Mar 2024 12:22:31 +0100 Subject: [PATCH] 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 Signed-off-by: Eric Van Hensbergen Signed-off-by: Sasha Levin --- fs/9p/vfs_inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index 0791480bf922b..88ca5015f987e 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -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; -- 2.47.3