Re: [PATCH] Audit: do not print error when SELinux disabled

[Casey Schaufler <casey@schaufler-ca.com>]

On 10/23/2012 5:58 AM, Eric Paris wrote:
> RHBZ: 785936
> About to be posted upstream
>
> If the audit system collects a record about one process sending a signal
> to another process it includes in that collection the 'secid' or 'an int
> used to represet an SELinux label.'  If SELinux is disabled it will
> collect a 0.  The problem is that when we attempt to print that record
> we ask the LSM to convert the secid back to a string.  Since there is no
> LSM it returns EOPNOTSUPP.

There's no problem with the patch, but the description would
lead the reader to assume that only SELinux is affected.

>
> Most code in the audit system checks if the secid is 0 and does not
> print LSM info in that case.  The signal information code however forgot
> that check.  Thus users will see a message in syslog indicating that
> converting the sid to string failed.  Add the right check.
>
> Signed-off-by: Eric Paris <eparis@redhat.com>
>
> ---
>
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 857f2e2..1f5cc03 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -1195,12 +1195,14 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
>  
>  	audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, auid,
>  			 uid, sessionid);
> -	if (security_secid_to_secctx(sid, &ctx, &len)) {
> -		audit_log_format(ab, " obj=(none)");
> -		rc = 1;
> -	} else {
> -		audit_log_format(ab, " obj=%s", ctx);
> -		security_release_secctx(ctx, len);
> +	if (sid) {
> +		if (security_secid_to_secctx(sid, &ctx, &len)) {
> +			audit_log_format(ab, " obj=(none)");
> +			rc = 1;
> +		} else {
> +			audit_log_format(ab, " obj=%s", ctx);
> +			security_release_secctx(ctx, len);
> +		}
>  	}
>  	audit_log_format(ab, " ocomm=");
>  	audit_log_untrustedstring(ab, comm);
>
>
>
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