linux-kernel - [PATCH] modsign: overwrite keys with zero before deleting them

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Message-Id: <1422050221-28345-1-git-send-email-holler@ahsoftware.de>
Date:	Fri, 23 Jan 2015 22:57:01 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	linux-kernel@...r.kernel.org
Cc:	linux-kbuild@...r.kernel.org, Michal Marek <mmarek@...e.cz>,
	David Howells <dhowells@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alexander Holler <holler@...oftware.de>
Subject: [PATCH] modsign: overwrite keys with zero before deleting them

This is for the more paranoid people, also it's
questionable what paranoid nowadays means.

Signed-off-by: Alexander Holler <holler@...oftware.de>
---
 Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index 7ad66de..590ff53 100644
--- a/Makefile
+++ b/Makefile
@@ -1132,7 +1132,9 @@ ifeq ($(CONFIG_MODULE_SIG_THROW_AWAY), y)
 	@echo "###"
 	@echo "### Deleting key used to sign modules."
 	@echo "###"
+	@dd status=none if=/dev/zero of=./signing_key.priv bs=4096 count=1
 	@rm ./signing_key.priv
+	@dd status=none if=/dev/zero of=./signing_key.x509 bs=4096 count=1
 	@rm ./signing_key.x509
 endif
 
-- 
2.0.5

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