linux-kernel - [PATCH] Restrict read access to private module signing key

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Message-Id: <1454160464-12380-1-git-send-email-aranea@aixah.de>
Date:	Sat, 30 Jan 2016 14:27:44 +0100
From:	Luis Ressel <aranea@...ah.de>
To:	David Howells <dhowells@...hat.com>,
	David Woodhouse <dwmw2@...radead.org>,
	keyrings@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Restrict read access to private module signing key

The autogenerated module signing key shouldn't be world-readable.

Signed-off-by: Luis Ressel <aranea@...ah.de>
---
 certs/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/certs/Makefile b/certs/Makefile
index 28ac694..7f1f082 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -49,6 +49,8 @@ $(obj)/signing_key.pem: $(obj)/x509.genkey
 	@echo "### needs to be run as root, and uses a hardware random"
 	@echo "### number generator if one is available."
 	@echo "###"
+	touch $(obj)/signing_key.pem
+	chmod 0600 $(obj)/signing_key.pem
 	openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
 		-batch -x509 -config $(obj)/x509.genkey \
 		-outform PEM -out $(obj)/signing_key.pem \
-- 
2.7.0