linux-kernel - [PATCH 5.10/5.15] scsi: add a length check for VARIABLE_LENGTH

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Date: Thu, 21 Mar 2024 14:02:29 +0300
From: Mikhail Ukhin <mish.uxin2012@...dex.ru>
To: Jens Axboe <axboe@...nel.dk>
Cc: Mikhail Ukhin <mish.uxin2012@...dex.ru>,
	linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
	Niklas Cassel <cassel@...nel.org>,
	Pavel Koshutin <koshutin.pavel@...dex.ru>,
	Artem Sadovnikov <ancowi69@...il.com>,
	Mikhail Ivanov <iwanov-23@...ru>
Subject: [PATCH 5.10/5.15] scsi: add a length check for VARIABLE_LENGTH_CMD commands

Fuzzing of 5.10 stable branch reports a slab-out-of-bounds error in
ata_scsi_pass_thru.

The error is fixed in 5.18 by commit
ce70fd9a551af7424a7dace2a1ba05a7de8eae27.
Backporting this commit would require significant changes to the code so
it is bettter to use a simple fix for that particular error.

The problem is that the length of the received SCSI command is not
validated if scsi_op == VARIABLE_LENGTH_CMD. It can lead to out-of-bounds
reading if the user sends a request with SCSI command of length less than
32.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Signed-off-by: Artem Sadovnikov <ancowi69@...il.com>
Signed-off-by: Mikhail Ivanov <iwanov-23@...ru>
---
 drivers/ata/libata-scsi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index dfa090ccd21c..77589e911d3d 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -4065,6 +4065,9 @@ int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev)

 	if (unlikely(!scmd->cmd_len))
 		goto bad_cdb_len;
+
+	if (scsi_op == VARIABLE_LENGTH_CMD && scmd->cmd_len < 32)
+		goto bad_cdb_len;

 	if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
 		if (unlikely(scmd->cmd_len > dev->cdb_len))
-- 
2.25.1