linux-kernel - [PATCH] ceph: fix decoding of client session messages flags

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220523160951.8781-1-lhenriques@suse.de>
Date:   Mon, 23 May 2022 17:09:51 +0100
From:   Luís Henriques <lhenriques@...e.de>
To:     Jeff Layton <jlayton@...nel.org>, Xiubo Li <xiubli@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luís Henriques <lhenriques@...e.de>
Subject: [PATCH] ceph: fix decoding of client session messages flags

The cephfs kernel client started to show  the message:

 ceph: mds0 session blocklisted

when mounting a filesystem.  This is due to the fact that the session
messages are being incorrectly decoded: the skip needs to take into
account the 'len'.

While there, fixed some whitespaces too.

Fixes: e1c9788cb397 ("ceph: don't rely on error_string to validate blocklisted session.")
Signed-off-by: Luís Henriques <lhenriques@...e.de>
---
 fs/ceph/mds_client.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 00c3de177dd6..1bd3e1bb0fdf 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -3375,13 +3375,17 @@ static void handle_session(struct ceph_mds_session *session,
 	}
 
 	if (msg_version >= 5) {
-		u32 flags;
-		/* version >= 4, struct_v, struct_cv, len, metric_spec */
-	        ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 2, bad);
+		u32 flags, len;
+
+		/* version >= 4 */
+		ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
+		ceph_decode_32_safe(&p, end, len, bad); /* len */
+		ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
+
 		/* version >= 5, flags   */
-                ceph_decode_32_safe(&p, end, flags, bad);
+		ceph_decode_32_safe(&p, end, flags, bad);
 		if (flags & CEPH_SESSION_BLOCKLISTED) {
-		        pr_warn("mds%d session blocklisted\n", session->s_mds);
+			pr_warn("mds%d session blocklisted\n", session->s_mds);
 			blocklisted = true;
 		}
 	}