linux-kernel - [PATCH AUTOSEL 4.9 27/30] floppy: fix out-of-bounds read in copy

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Message-Id: <20190726134432.12993-27-sashal@kernel.org>
Date:   Fri, 26 Jul 2019 09:44:29 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Denis Efremov <efremov@...ras.ru>, Willy Tarreau <w@....eu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-block@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 27/30] floppy: fix out-of-bounds read in copy_buffer

From: Denis Efremov <efremov@...ras.ru>

[ Upstream commit da99466ac243f15fbba65bd261bfc75ffa1532b6 ]

This fixes a global out-of-bounds read access in the copy_buffer
function of the floppy driver.

The FDDEFPRM ioctl allows one to set the geometry of a disk.  The sect
and head fields (unsigned int) of the floppy_drive structure are used to
compute the max_sector (int) in the make_raw_rw_request function.  It is
possible to overflow the max_sector.  Next, max_sector is passed to the
copy_buffer function and used in one of the memcpy calls.

An unprivileged user could trigger the bug if the device is accessible,
but requires a floppy disk to be inserted.

The patch adds the check for the .sect * .head multiplication for not
overflowing in the set_geometry function.

The bug was found by syzkaller.

Signed-off-by: Denis Efremov <efremov@...ras.ru>
Tested-by: Willy Tarreau <w@....eu>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/block/floppy.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index bb9b50d1d828..de76b66893aa 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3236,8 +3236,10 @@ static int set_geometry(unsigned int cmd, struct floppy_struct *g,
 	int cnt;

 	/* sanity checking for parameters. */
-	if (g->sect <= 0 ||
-	    g->head <= 0 ||
+	if ((int)g->sect <= 0 ||
+	    (int)g->head <= 0 ||
+	    /* check for overflow in max_sector */
+	    (int)(g->sect * 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) ||
-- 
2.20.1