linux-kernel - [PATCH v3 2/6] block: Error an attempt to split an atomic write in bio

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241031095918.99964-3-john.g.garry@oracle.com>
Date: Thu, 31 Oct 2024 09:59:14 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, song@...nel.org, yukuai3@...wei.com, hch@....de
Cc: martin.petersen@...cle.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org, hare@...e.de,
        Johannes.Thumshirn@....com, John Garry <john.g.garry@...cle.com>,
        Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH v3 2/6] block: Error an attempt to split an atomic write in bio_split()

This is disallowed.

Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 block/bio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block/bio.c b/block/bio.c
index 7a93724e4a49..07b971853768 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1749,6 +1749,10 @@ struct bio *bio_split(struct bio *bio, int sectors,
 	if (WARN_ON_ONCE(bio_op(bio) == REQ_OP_ZONE_APPEND))
 		return ERR_PTR(-EINVAL);
 
+	/* atomic writes cannot be split */
+	if (bio->bi_opf & REQ_ATOMIC)
+		return ERR_PTR(-EINVAL);
+
 	split = bio_alloc_clone(bio->bi_bdev, bio, gfp, bs);
 	if (!split)
 		return ERR_PTR(-ENOMEM);
-- 
2.31.1