SELinux: bigendian problems with filename trans rules
Eric Paris [Thu, 20 Feb 2014 15:56:45 +0000 (10:56 -0500)]
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@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

security/selinux/ss/policydb.c

index 142a59f..bcdca73 100644 (file)
@@ -3258,10 +3258,10 @@ static int filename_write_helper(void *key, void *data, void *ptr)
        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)