linux-kernel - [PATCH v2 4/6] qedf: ensure the copied buf is NUL terminated

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Date: Wed, 24 Apr 2024 21:44:21 +0700
From: Bui Quang Minh <minhquangbui99@...il.com>
To: Jesse Brandeburg <jesse.brandeburg@...el.com>, 
 Tony Nguyen <anthony.l.nguyen@...el.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Paul M Stillwell Jr <paul.m.stillwell.jr@...el.com>, 
 Rasesh Mody <rmody@...vell.com>, Sudarsana Kalluru <skalluru@...vell.com>, 
 GR-Linux-NIC-Dev@...vell.com, Anil Gurumurthy <anil.gurumurthy@...gic.com>, 
 Sudarsana Kalluru <sudarsana.kalluru@...gic.com>, 
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>, 
 Fabian Frederick <fabf@...net.be>, Saurav Kashyap <skashyap@...vell.com>, 
 GR-QLogic-Storage-Upstream@...vell.com, 
 Nilesh Javali <nilesh.javali@...ium.com>, Arun Easi <arun.easi@...ium.com>, 
 Manish Rangankar <manish.rangankar@...ium.com>, 
 Vineeth Vijayan <vneethv@...ux.ibm.com>, 
 Peter Oberparleiter <oberpar@...ux.ibm.com>, 
 Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, 
 Alexander Gordeev <agordeev@...ux.ibm.com>, 
 Christian Borntraeger <borntraeger@...ux.ibm.com>, 
 Sven Schnelle <svens@...ux.ibm.com>, Sunil Goutham <sgoutham@...vell.com>, 
 Linu Cherian <lcherian@...vell.com>, Geetha sowjanya <gakula@...vell.com>, 
 Jerin Jacob <jerinj@...vell.com>, hariprasad <hkelam@...vell.com>, 
 Subbaraya Sundeep <sbhatta@...vell.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org, 
 Saurav Kashyap <saurav.kashyap@...ium.com>, linux-s390@...r.kernel.org, 
 Jens Axboe <axboe@...nel.dk>, Bui Quang Minh <minhquangbui99@...il.com>
Subject: [PATCH v2 4/6] qedf: ensure the copied buf is NUL terminated

Currently, we allocate a count-sized kernel buffer and copy count from
userspace to that buffer. Later, we use kstrtouint on this buffer but we
don't ensure that the string is terminated inside the buffer, this can
lead to OOB read when using kstrtouint. Fix this issue by using
memdup_user_nul instead of memdup_user.

Fixes: 61d8658b4a43 ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.")
Signed-off-by: Bui Quang Minh <minhquangbui99@...il.com>
---
 drivers/scsi/qedf/qedf_debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/qedf/qedf_debugfs.c b/drivers/scsi/qedf/qedf_debugfs.c
index 451fd236bfd0..96174353e389 100644
--- a/drivers/scsi/qedf/qedf_debugfs.c
+++ b/drivers/scsi/qedf/qedf_debugfs.c
@@ -170,7 +170,7 @@ qedf_dbg_debug_cmd_write(struct file *filp, const char __user *buffer,
 	if (!count || *ppos)
 		return 0;

-	kern_buf = memdup_user(buffer, count);
+	kern_buf = memdup_user_nul(buffer, count);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);

-- 
2.34.1