From: Bryam Vargas <hexlabsecurity@proton.me>
To: Dust Li <dust.li@linux.alibaba.com>
Cc: Wenjia Zhang <wenjia@linux.ibm.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>,
Ursula Braun <ubraun@linux.ibm.com>,
Stefan Raspl <raspl@linux.ibm.com>,
Tony Lu <tonylu@linux.alibaba.com>,
Paolo Abeni <pabeni@redhat.com>, Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, linux-s390@vger.kernel.org,
linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 3/3] net/smc: bound the send length to the send buffer in smc_tx_sendmsg()
Date: Thu, 18 Jun 2026 22:11:22 +0000 [thread overview]
Message-ID: <20260618221115.236718-1-hexlabsecurity@proton.me> (raw)
In-Reply-To: <ajQX7_9xFI9GSaq5@linux.alibaba.com>
On Fri, 19 Jun 2026 00:08:15 +0800, Dust Li wrote:
> I think this is the same as patch #2.
Same story as 2/3, just on the SMC-D send side: sndbuf_space accumulates
diff_tx = smc_curs_diff(sndbuf_desc->len, tx_curs_fin, cons) from the peer's consumer
cursor, so a cons alternating wrap 0<->1 walks it past sndbuf_desc->len (and negative
over time), and smc_tx_sendmsg's wrap-around write then runs off the end of the
buffer. The boundary count check doesn't bound diff_tx here either, so I'd keep the
same two-line bound. The same A/B covers it.
Bryam
next prev parent reply other threads:[~2026-06-18 22:11 UTC|newest]
Thread overview: 11+ 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
2026-06-18 14:29 ` Dust Li
2026-06-18 22:11 ` Bryam Vargas
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
2026-06-18 16:03 ` Dust Li
2026-06-18 22:11 ` Bryam Vargas
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
2026-06-18 16:08 ` Dust Li
2026-06-18 22:11 ` Bryam Vargas [this message]
2026-06-17 23:24 ` [PATCH v3 0/3] net/smc: bound wire-controlled CDC cursors against the local buffers Jakub Kicinski
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