From: Jakub Kicinski <kuba@kernel.org>
To: Bryam Vargas via B4 Relay <devnull+hexlabsecurity.proton.me@kernel.org>
Cc: hexlabsecurity@proton.me, Wenjia Zhang <wenjia@linux.ibm.com>,
Dust Li <dust.li@linux.alibaba.com>,
"D. Wythe" <alibuda@linux.alibaba.com>,
Sidraya Jayagond <sidraya@linux.ibm.com>,
Eric Dumazet <edumazet@google.com>,
"David S. Miller" <davem@davemloft.net>,
Mahanta Jambigi <mjambigi@linux.ibm.com>,
Wen Gu <guwen@linux.alibaba.com>, Simon Horman <horms@kernel.org>,
netdev@vger.kernel.org, Ursula Braun <ubraun@linux.ibm.com>,
Stefan Raspl <raspl@linux.ibm.com>,
linux-s390@vger.kernel.org, Paolo Abeni <pabeni@redhat.com>,
linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
Tony Lu <tonylu@linux.alibaba.com>
Subject: Re: [PATCH v3 0/3] net/smc: bound wire-controlled CDC cursors against the local buffers
Date: Wed, 17 Jun 2026 16:24:54 -0700 [thread overview]
Message-ID: <20260617162454.33e95c2f@kernel.org> (raw)
In-Reply-To: <20260614-b4-disp-edd64be9-v3-0-551fa514257e@proton.me>
On Sun, 14 Jun 2026 03:23:29 -0500 Bryam Vargas via B4 Relay wrote:
> A peer's CDC producer/consumer cursors are copied from the wire and used,
> without an upper bound against the local buffers, as (a) a raw index into the
> RMB on the urgent path, (b) the receive length in smc_rx_recvmsg(), and (c) the
> send length in smc_tx_sendmsg() on the SMC-D DMB-merge path. A malicious or
> buggy peer can forge a cursor so each of these runs past the relevant buffer:
> an out-of-bounds read of adjacent kernel memory (disclosed to the peer) on the
> receive/urgent side, and an out-of-bounds write of attacker-influenced length
> and content on the send side.
Once again, SMC maintainers -- please review.
--
mping: SHARED MEMORY COMMUNICATIONS (SMC) SOCKETS
prev parent reply other threads:[~2026-06-17 23:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-14 8:23 [PATCH v3 0/3] net/smc: bound wire-controlled CDC cursors against the local buffers Bryam Vargas via B4 Relay
2026-06-14 8:23 ` [PATCH v3 1/3] net/smc: bound the wire-controlled producer cursor to the RMB Bryam Vargas via B4 Relay
2026-06-14 8:23 ` [PATCH v3 2/3] net/smc: bound the receive length to the RMB in smc_rx_recvmsg() Bryam Vargas via B4 Relay
2026-06-14 8:23 ` [PATCH v3 3/3] net/smc: bound the send length to the send buffer in smc_tx_sendmsg() Bryam Vargas via B4 Relay
2026-06-17 23:24 ` Jakub Kicinski [this message]
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