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Miller" , Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , "Jamal Hadi Salim" , Cong Wang , Jiri Pirko , Patrick McHardy , Jesper Dangaard Brouer , Paolo Abeni , Christoph Paasch , Peter Krystad CC: Young Xiao <92siuyang@gmail.com>, , "Maxim Mikityanskiy" Subject: [PATCH net 1/3] netfilter: synproxy: Fix out of bounds when parsing TCP options Date: Wed, 9 Jun 2021 17:22:10 +0300 Message-ID: <20210609142212.3096691-2-maximmi@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210609142212.3096691-1-maximmi@nvidia.com> References: <20210609142212.3096691-1-maximmi@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 7d3327c2-8ce3-4958-3a67-08d92b5210c2 X-MS-TrafficTypeDiagnostic: CH0PR12MB5106: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:538; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.35;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:schybrid02.nvidia.com;CAT:NONE;SFS:(4636009)(376002)(396003)(136003)(39860400002)(346002)(46966006)(36840700001)(86362001)(426003)(82310400003)(7636003)(316002)(356005)(6666004)(186003)(7696005)(54906003)(47076005)(110136005)(8676002)(336012)(478600001)(36906005)(4326008)(26005)(83380400001)(1076003)(5660300002)(921005)(107886003)(70206006)(8936002)(82740400003)(36756003)(7416002)(36860700001)(70586007)(2616005)(2906002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jun 2021 14:22:51.6963 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7d3327c2-8ce3-4958-3a67-08d92b5210c2 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.35];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT037.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR12MB5106 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The TCP option parser in synproxy (synproxy_parse_options) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1. This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options."). Cc: Young Xiao <92siuyang@gmail.com> Fixes: 48b1de4c110a ("netfilter: add SYNPROXY core/target") Signed-off-by: Maxim Mikityanskiy --- net/netfilter/nf_synproxy_core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/netfilter/nf_synproxy_core.c b/net/netfilter/nf_synproxy_core.c index b100c04a0e43..621eb5ef9727 100644 --- a/net/netfilter/nf_synproxy_core.c +++ b/net/netfilter/nf_synproxy_core.c @@ -47,6 +47,8 @@ synproxy_parse_options(const struct sk_buff *skb, unsigned int doff, length--; continue; default: + if (length < 2) + return true; opsize = *ptr++; if (opsize < 2) return true; -- 2.25.1