linux-kernel - [PATCH 3.4 39/99] SELinux: bigendian problems with filename trans rules

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Date:	Fri,  7 Mar 2014 17:07:35 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Eric Paris <eparis@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Paul Moore <pmoore@...hat.com>
Subject: [PATCH 3.4 39/99] SELinux: bigendian problems with filename trans rules

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Paris <eparis@...hat.com>

commit 9085a6422900092886da8c404e1c5340c4ff1cbf upstream.

When writing policy via /sys/fs/selinux/policy I wrote the type and class
of filename trans rules in CPU endian instead of little endian.  On
x86_64 this works just fine, but it means that on big endian arch's like
ppc64 and s390 userspace reads the policy and converts it from
le32_to_cpu.  So the values are all screwed up.  Write the values in le
format like it should have been to start.

Signed-off-by: Eric Paris <eparis@...hat.com>
Acked-by:  Stephen Smalley <sds@...ho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 security/selinux/ss/policydb.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -3214,10 +3214,10 @@ static int filename_write_helper(void *k
 	if (rc)
 		return rc;
 
-	buf[0] = ft->stype;
-	buf[1] = ft->ttype;
-	buf[2] = ft->tclass;
-	buf[3] = otype->otype;
+	buf[0] = cpu_to_le32(ft->stype);
+	buf[1] = cpu_to_le32(ft->ttype);
+	buf[2] = cpu_to_le32(ft->tclass);
+	buf[3] = cpu_to_le32(otype->otype);
 
 	rc = put_entry(buf, sizeof(u32), 4, fp);
 	if (rc)


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