From: Leon Romanovsky <leon@kernel.org>
To: Zhu Yanjun <zyjzyj2000@gmail.com>, Jason Gunthorpe <jgg@ziepe.ca>,
Tristan Madani <tristmd@gmail.com>,
linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
Nicolas Morey <nmorey@suse.com>
Cc: Zhu Yanjun <yanjun.zhu@linux.dev>
Subject: Re: [PATCH v2] RDMA/rxe: Use validated num_sge in local buffer
Date: Mon, 14 Sep 2026 08:10:06 -0400 [thread overview]
Message-ID: <178938780667.974012.344479087887135840.b4-ty@kernel.org> (raw)
In-Reply-To: <20260909160132.1491248-1-nmorey@suse.com>
On Wed, 09 Sep 2026 18:01:31 +0200, Nicolas Morey wrote:
> For both SRQ and non-SRQ receive paths, the WQE is copied into a local
> buffer to provide a kernel-owned, validated copy. While calculating the
> memcpy size from the validated num_sge prevents overflow during the
> copy, memcpy() itself still copies num_sge from shared memory.
>
> A concurrent userspace modification before or during memcpy() leaves
> an unvalidated num_sge in the local buffer, leading to potential
> out-of-bounds reads in rxe_resp_check_length() and copy_data() causing:
>
> [...]
Applied, thanks!
[1/1] RDMA/rxe: Use validated num_sge in local buffer
https://git.kernel.org/rdma/rdma/c/112f2b6925c2d7
Best regards,
--
Leon Romanovsky <leon@kernel.org>
prev parent reply other threads:[~2026-09-14 12:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-09 16:01 Nicolas Morey
2026-09-14 12:10 ` Leon Romanovsky [this message]
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