From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932465AbcAJFAe (ORCPT ); Sun, 10 Jan 2016 00:00:34 -0500 Received: from mail-pa0-f42.google.com ([209.85.220.42]:35149 "EHLO mail-pa0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756855AbcAJE7X (ORCPT ); Sat, 9 Jan 2016 23:59:23 -0500 From: Peter Hurley To: Greg Kroah-Hartman Cc: Jiri Slaby , linux-audit@redhat.com, linux-kernel@vger.kernel.org, Peter Hurley Subject: [RESEND][PATCH 10/15] tty: audit: Remove false memory optimization Date: Sat, 9 Jan 2016 20:59:03 -0800 Message-Id: <1452401948-30790-11-git-send-email-peter@hurleysoftware.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1452401948-30790-1-git-send-email-peter@hurleysoftware.com> References: <1447207560-16410-1-git-send-email-peter@hurleysoftware.com> <1452401948-30790-1-git-send-email-peter@hurleysoftware.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The tty audit buffer is allocated at first use and not freed until the process exits. If tty audit is turned off after the audit buffer has been allocated, no effort is made to release the buffer. So re-checking if tty audit has just been turned off when tty audit was just on is false optimization; the likelihood of triggering this condition is exceedingly small. Signed-off-by: Peter Hurley --- drivers/tty/tty_audit.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c index 3d90f88..7943984 100644 --- a/drivers/tty/tty_audit.c +++ b/drivers/tty/tty_audit.c @@ -200,8 +200,7 @@ int tty_audit_push(void) * tty_audit_buf_get - Get an audit buffer. * * Get an audit buffer, allocate it if necessary. Return %NULL - * if TTY auditing is disabled or out of memory. Otherwise, return a new - * reference to the buffer. + * if out of memory. Otherwise, return a new reference to the buffer. */ static struct tty_audit_buf *tty_audit_buf_get(void) { @@ -224,9 +223,6 @@ static struct tty_audit_buf *tty_audit_buf_get(void) return NULL; } - if (~current->signal->audit_tty & AUDIT_TTY_ENABLE) - goto out; - spin_lock_irqsave(¤t->sighand->siglock, flags); buf = current->signal->tty_audit_buf; if (!buf) { -- 2.7.0