linux-kernel - [PATCH 4.9 19/96] scsi: sg: allocate with __GFP_ZERO in sg_build

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: <20180524093606.702135570@linuxfoundation.org>
Date:   Thu, 24 May 2018 11:38:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+7d26fc1eea198488deab@...kaller.appspotmail.com,
        Alexander Potapenko <glider@...gle.com>,
        Douglas Gilbert <dgilbert@...erlog.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.9 19/96] scsi: sg: allocate with __GFP_ZERO in sg_build_indirect()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Potapenko <glider@...gle.com>

commit a45b599ad808c3c982fdcdc12b0b8611c2f92824 upstream.

This shall help avoid copying uninitialized memory to the userspace when
calling ioctl(fd, SG_IO) with an empty command.

Reported-by: syzbot+7d26fc1eea198488deab@...kaller.appspotmail.com
Cc: stable@...r.kernel.org
Signed-off-by: Alexander Potapenko <glider@...gle.com>
Acked-by: Douglas Gilbert <dgilbert@...erlog.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/sg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1893,7 +1893,7 @@ retry:
 		num = (rem_sz > scatter_elem_sz_prev) ?
 			scatter_elem_sz_prev : rem_sz;

-		schp->pages[k] = alloc_pages(gfp_mask, order);
+		schp->pages[k] = alloc_pages(gfp_mask | __GFP_ZERO, order);
 		if (!schp->pages[k])
 			goto out;