[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20230728065819.139694-1-oleksandr@redhat.com>
Date: Fri, 28 Jul 2023 08:58:16 +0200
From: Oleksandr Natalenko <oleksandr@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-scsi@...r.kernel.org, Saurav Kashyap <skashyap@...vell.com>,
Johannes Thumshirn <Johannes.Thumshirn@....com>,
GR-QLogic-Storage-Upstream@...vell.com,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Jozef Bacik <jobacik@...hat.com>,
Laurence Oberman <loberman@...hat.com>,
Rob Evers <revers@...hat.com>
Subject: [PATCH 0/3] scsi: qedf: sanitise uaccess
qedf driver, debugfs part of it specifically, touches __user pointers
directly for printing out info to userspace via sprintf(), which may
cause crash like this:
BUG: unable to handle kernel paging request at 00007ffd1d6b43a0
IP: [<ffffffffaa7a882a>] string.isra.7+0x6a/0xf0
Oops: 0003 [#1] SMP
Call Trace:
[<ffffffffaa7a9f31>] vsnprintf+0x201/0x6a0
[<ffffffffaa7aa556>] sprintf+0x56/0x80
[<ffffffffc04227ed>] qedf_dbg_stop_io_on_error_cmd_read+0x6d/0x90 [qedf]
[<ffffffffaa65bb2f>] vfs_read+0x9f/0x170
[<ffffffffaa65cb82>] SyS_pread64+0x92/0xc0
Avoid this by preparing the info in a kernel buffer first, either
allocated on stack for small printouts, or via vmalloc() for big ones,
and then copying it to the userspace properly.
Previous submission is an RFC: [1]. There are no code changes since
then. The RFC prefix is dropped. The Tested-by tag from Laurence is
added.
There's similar submission from Saurav [2], but we agreed I could nack
it and proceed with my one.
[1] https://lore.kernel.org/linux-scsi/20230724120241.40495-1-oleksandr@redhat.com/
[2] https://lore.kernel.org/linux-scsi/20230726101236.11922-1-skashyap@marvell.com/
Oleksandr Natalenko (3):
scsi: qedf: do not touch __user pointer in
qedf_dbg_stop_io_on_error_cmd_read() directly
scsi: qedf: do not touch __user pointer in qedf_dbg_debug_cmd_read()
directly
scsi: qedf: do not touch __user pointer in qedf_dbg_fp_int_cmd_read()
directly
drivers/scsi/qedf/qedf_dbg.h | 2 ++
drivers/scsi/qedf/qedf_debugfs.c | 35 +++++++++++++++++++-------------
2 files changed, 23 insertions(+), 14 deletions(-)
--
2.41.0
Powered by blists - more mailing lists