Commit 8b0d77f1 authored Jul 03, 2013 by Cong Wang Committed by Linus Torvalds Jul 03, 2013

block/compat_ioctl.c: do not leak info to user-space



There is a hole in struct hd_geometry, so we have to zero the struct on
stack before copying it to user-space.

Signed-off-by: Cong Wang <amwang@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 31bd8fbb

block/compat_ioctl.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -59,6 +59,7 @@ static int compat_hdio_getgeo(struct gendisk disk, struct block_device bdev,
		if (!disk->fops->getgeo)
		return -ENOTTY;

		memset(&geo, 0, sizeof(geo));
		/*
		* We need to set the startsect first, the driver may
		* want to override it.