lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <lsq.1388282923.70640511@decadent.org.uk>
Date:	Sun, 29 Dec 2013 03:08:43 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Richard Guy Briggs" <rgb@...hat.com>,
	"Tyler Hicks" <tyhicks@...onical.com>,
	"Kees Cook" <keescook@...omium.org>,
	"Al Viro" <viro@...iv.linux.org.uk>, linux-audit@...hat.com,
	"Eric Paris" <eparis@...hat.com>
Subject: [PATCH 3.2 027/185] audit: printk USER_AVC messages when audit
 isn't enabled

3.2.54-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Tyler Hicks <tyhicks@...onical.com>

commit 0868a5e150bc4c47e7a003367cd755811eb41e0b upstream.

When the audit=1 kernel parameter is absent and auditd is not running,
AUDIT_USER_AVC messages are being silently discarded.

AUDIT_USER_AVC messages should be sent to userspace using printk(), as
mentioned in the commit message of 4a4cd633 ("AUDIT: Optimise the
audit-disabled case for discarding user messages").

When audit_enabled is 0, audit_receive_msg() discards all user messages
except for AUDIT_USER_AVC messages. However, audit_log_common_recv_msg()
refuses to allocate an audit_buffer if audit_enabled is 0. The fix is to
special case AUDIT_USER_AVC messages in both functions.

It looks like commit 50397bd1 ("[AUDIT] clean up audit_receive_msg()")
introduced this bug.

Signed-off-by: Tyler Hicks <tyhicks@...onical.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Eric Paris <eparis@...hat.com>
Cc: linux-audit@...hat.com
Acked-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
Signed-off-by: Eric Paris <eparis@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/audit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -625,7 +625,7 @@ static int audit_log_common_recv_msg(str
 	char *ctx = NULL;
 	u32 len;
 
-	if (!audit_enabled) {
+	if (!audit_enabled && msg_type != AUDIT_USER_AVC) {
 		*ab = NULL;
 		return rc;
 	}

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ