From: Vasiliy Kulikov <segooon@gmail.com>
Date: Thu, 28 Oct 2010 12:31:55 +0000 (-0600)
Subject: block: cciss: fix information leak to userland
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7ab5118d7c2be650bc936894f159dc1c597badae;p=linux-beck.git

block: cciss: fix information leak to userland

Structure IOCTL_Command_struct is copied to userland with
some padding fields at the end of the struct unitialized.
It leads to leaking of contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index f09e6df15aa7..13d87a031c88 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1184,6 +1184,7 @@ static int cciss_ioctl32_big_passthru(struct block_device *bdev, fmode_t mode,
 	int err;
 	u32 cp;
 
+	memset(&arg64, 0, sizeof(arg64));
 	err = 0;
 	err |=
 	    copy_from_user(&arg64.LUN_info, &arg32->LUN_info,