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Thu, 13 Feb 2025 10:13:55 -0800 (PST) From: Jens Axboe To: Pavel Begunkov , Caleb Sander Mateos Cc: Riley Thomasson , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20250212204546.3751645-1-csander@purestorage.com> References: <20250212204546.3751645-1-csander@purestorage.com> Subject: Re: [PATCH 0/2] uring_cmd SQE corruptions Message-Id: <173947043564.300246.6895423669336979822.b4-ty@kernel.dk> Date: Thu, 13 Feb 2025 11:13:55 -0700 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.14.3-dev-14bd6 On Wed, 12 Feb 2025 13:45:44 -0700, Caleb Sander Mateos wrote: > In our application issuing NVMe passthru commands, we have observed > nvme_uring_cmd fields being corrupted between when userspace initializes > the io_uring SQE and when nvme_uring_cmd_io() processes it. > > We hypothesized that the uring_cmd's were executing asynchronously after > the io_uring_enter() syscall returned, yet were still reading the SQE in > the userspace-mapped SQ. Since io_uring_enter() had already incremented > the SQ head index, userspace reused the SQ slot for a new SQE once the > SQ wrapped around to it. > > [...] Applied, thanks! [1/2] io_uring/uring_cmd: don't assume io_uring_cmd_data layout commit: 34cae91215c6f65bed2a124fb9283da6ec0b8dd9 [2/2] io_uring/uring_cmd: switch sqe to async_data on EAGAIN commit: e663da62ba8672aaa66843f1af8b20e3bb1a0515 Best regards, -- Jens Axboe