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Wong" , Andrew Morton , asml.silence@gmail.com, hch@lst.de, Anuj Gupta Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, Li Wang Subject: [RFC 1/6] block: refuse a dma-buf bio that carries a crypto context Date: Thu, 5 Nov 2026 14:58:42 +0800 Message-ID: <20261105065847.196540-2-mengmeng.zhao@linux.dev> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261105065847.196540-1-mengmeng.zhao@linux.dev> References: <20261105065847.196540-1-mengmeng.zhao@linux.dev> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: grcyfyy5nbr3pwe4h9iyhiicpdpmn4oo X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: BF49620005 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1793861966-617050 X-HE-Meta: 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 RQ3MozpR mOC3N2sjtdTqnodo3WGLv/kyzKcD61XMnM2E1+cCxEfGX5LWW06vZS2ccuIaHLj1/35VRw9eBBcJOMugNZfenKCpOThdS58jxD8Am67jZ25lVswrj1i1isfdrUGjjgfe/fA8lezuYxsF+s9AxRPUpxILa2qwb8eSsAzfk7FJ63Z1kfTVmXJ9sppzGkKyOmoh8vZmKcLvIls3oRmspzdxdaxhHBpw27HJwgFH/WQozLlaFKuGeXOqWuYXh5z0fWDM+bdFAOIlknoVqif5Pyb3ukj6g5adkKKJ3m4AgWUaX7aqQaLY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 From: Mengmeng Zhao A dma-buf bio has no pages for the crypto layer to walk: the software fallback would read the map as bio_vecs. Refuse it in blk_mq_submit_bio() before it can reach that path. Signed-off-by: Mengmeng Zhao Signed-off-by: Li Wang --- block/blk-mq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index be5671966787..f0d978b1724f 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3138,8 +3138,10 @@ void blk_mq_submit_bio(struct bio *bio) goto queue_exit; } + /* a dma-buf bio has no pages for integrity work or contents crypto */ if (unlikely(op_is_dmabuf(bio->bi_opf) && - bdev_has_integrity_csum(bio->bi_bdev))) { + (bdev_has_integrity_csum(bio->bi_bdev) || + bio_has_crypt_ctx(bio)))) { bio_endio_status(bio, BLK_STS_NOTSUPP); goto queue_exit; } -- 2.43.0