linux-kernel - [PATCH] MODSIGN: Fix a compilation warning in extract-cert

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Message-ID: <20150908134145.4131.71987.stgit@warthog.procyon.org.uk>
Date:	Tue, 08 Sep 2015 14:41:46 +0100
From:	David Howells <dhowells@...hat.com>
To:	jmorris@...ei.org
Cc:	linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
	linux-kernel@...r.kernel.org, jim.epost@...il.com
Subject: [PATCH] MODSIGN: Fix a compilation warning in extract-cert

Fix the following warning when compiling extract-cert:

scripts/extract-cert.c: In function ‘write_cert’:
scripts/extract-cert.c:89:2: warning: format not a string literal and no format arguments [-Wformat-security]
  ERR(!i2d_X509_bio(wb, x509), cert_dst);
  ^

whereby the ERR() macro is taking cert_dst as the format string.  "%s"
should be used as the format string as the path could contain special
characters.

Reported-by: Jim Davis <jim.epost@...il.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Acked-by : David Woodhouse <david.woodhouse@...el.com>
---

 scripts/extract-cert.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/extract-cert.c b/scripts/extract-cert.c
index fd0db015c65c..10d23ca9f617 100644
--- a/scripts/extract-cert.c
+++ b/scripts/extract-cert.c
@@ -86,7 +86,7 @@ static void write_cert(X509 *x509)
 		ERR(!wb, "%s", cert_dst);
 	}
 	X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf));
-	ERR(!i2d_X509_bio(wb, x509), cert_dst);
+	ERR(!i2d_X509_bio(wb, x509), "%s", cert_dst);
 	if (kbuild_verbose)
 		fprintf(stderr, "Extracted cert: %s\n", buf);
 }

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