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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Denis Efremov <efremov@ispras.ru>, Willy Tarreau <w@1wt.eu>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Sasha Levin <sashal@kernel.org>,
	linux-block@vger.kernel.org
Subject: [PATCH AUTOSEL 4.9 26/30] floppy: fix div-by-zero in setup_format_params
Date: Fri, 26 Jul 2019 09:44:28 -0400	[thread overview]
Message-ID: <20190726134432.12993-26-sashal@kernel.org> (raw)
In-Reply-To: <20190726134432.12993-1-sashal@kernel.org>

From: Denis Efremov <efremov@ispras.ru>

[ Upstream commit f3554aeb991214cbfafd17d55e2bfddb50282e32 ]

This fixes a divide by zero error in the setup_format_params function of
the floppy driver.

Two consecutive ioctls can trigger the bug: The first one should set the
drive geometry with such .sect and .rate values for the F_SECT_PER_TRACK
to become zero.  Next, the floppy format operation should be called.

A floppy disk is not required to be inserted.  An unprivileged user
could trigger the bug if the device is accessible.

The patch checks F_SECT_PER_TRACK for a non-zero value in the
set_geometry function.  The proper check should involve a reasonable
upper limit for the .sect and .rate fields, but it could change the
UAPI.

The patch also checks F_SECT_PER_TRACK in the setup_format_params, and
cancels the formatting operation in case of zero.

The bug was found by syzkaller.

Signed-off-by: Denis Efremov <efremov@ispras.ru>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/block/floppy.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 6914c6e1e1a8..bb9b50d1d828 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -2113,6 +2113,9 @@ static void setup_format_params(int track)
 	raw_cmd->kernel_data = floppy_track_buffer;
 	raw_cmd->length = 4 * F_SECT_PER_TRACK;
 
+	if (!F_SECT_PER_TRACK)
+		return;
+
 	/* allow for about 30ms for data transport per track */
 	head_shift = (F_SECT_PER_TRACK + 5) / 6;
 
@@ -3235,6 +3238,8 @@ static int set_geometry(unsigned int cmd, struct floppy_struct *g,
 	/* sanity checking for parameters. */
 	if (g->sect <= 0 ||
 	    g->head <= 0 ||
+	    /* check for zero in F_SECT_PER_TRACK */
+	    (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 ||
 	    g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
 	    /* check if reserved bits are set */
 	    (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
-- 
2.20.1


       reply	other threads:[~2019-07-26 13:48 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190726134432.12993-1-sashal@kernel.org>
2019-07-26 13:44 ` Sasha Levin [this message]
2019-07-26 13:44 ` [PATCH AUTOSEL 4.9 27/30] floppy: fix out-of-bounds read in copy_buffer Sasha Levin

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