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Message-Id: <20210719144944.649280274@linuxfoundation.org>
Date: Mon, 19 Jul 2021 16:49:09 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Xiaoli Feng <xifeng@...hat.com>,
Ronnie Sahlberg <lsahlber@...hat.com>,
"Paulo Alcantara (SUSE)" <pc@....nz>,
Steve French <stfrench@...rosoft.com>
Subject: [PATCH 5.13 003/351] cifs: Do not use the original cruid when following DFS links for multiuser mounts
From: Ronnie Sahlberg <lsahlber@...hat.com>
commit 50630b3f1ada0bf412d3f28e73bac310448d9d6f upstream.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=213565
cruid should only be used for the initial mount and after this we should use the current
users credentials.
Ignore the original cruid mount argument when creating a new context for a multiuser mount
following a DFS link.
Fixes: 24e0a1eff9e2 ("cifs: switch to new mount api")
Cc: stable@...r.kernel.org # 5.11+
Reported-by: Xiaoli Feng <xifeng@...hat.com>
Signed-off-by: Ronnie Sahlberg <lsahlber@...hat.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@....nz>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
fs/cifs/cifs_dfs_ref.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -208,6 +208,10 @@ char *cifs_compose_mount_options(const c
else
noff = tkn_e - (sb_mountdata + off) + 1;
+ if (strncasecmp(sb_mountdata + off, "cruid=", 6) == 0) {
+ off += noff;
+ continue;
+ }
if (strncasecmp(sb_mountdata + off, "unc=", 4) == 0) {
off += noff;
continue;
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