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Message-Id: <1288882096-13456-1-git-send-email-segooon@gmail.com> Date: Thu, 4 Nov 2010 17:48:15 +0300 From: Vasiliy Kulikov <segooon@...il.com> To: kernel-janitors@...r.kernel.org Cc: Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org Subject: [PATCH] block: ioctl: fix information leak to userland Structure hd_geometry is copied to userland with 4 padding bytes between cylinders and start fields uninitialized on 64-bit platforms. It leads to leaking of contents of kernel stack memory. Currently there is no memset() in real implementations of getgeo() in drivers/block/, so it makes sense to have memset() in blkdev_ioctl(). Signed-off-by: Vasiliy Kulikov <segooon@...il.com> --- block/ioctl.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/block/ioctl.c b/block/ioctl.c index d724ceb..60bae81 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -242,6 +242,7 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, * We need to set the startsect first, the driver may * want to override it. */ + memset(&geo, 0, sizeof(geo)); geo.start = get_start_sect(bdev); ret = disk->fops->getgeo(bdev, &geo); if (ret) -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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