linux-kernel - Re: [PATCH V3 2/2] audit: log failed attempts to change audit

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Message-ID: <1598949.6T5upxUe0W@sifl>
Date:	Tue, 22 Dec 2015 18:47:49 -0500
From:	Paul Moore <pmoore@...hat.com>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	sgrubb@...hat.com, eparis@...hat.com, v.rathor@...il.com,
	ctcard@...mail.com
Subject: Re: [PATCH V3 2/2] audit: log failed attempts to change audit_pid configuration

On Tuesday, December 22, 2015 04:03:07 AM Richard Guy Briggs wrote:
> Failed attempts to change the audit_pid configuration are not presently
> logged.  One case is an attempt to starve an old auditd by starting up a
> new auditd when the old one is still alive and active.  The other case
> is an attempt to orphan a new auditd when an old auditd shuts down.
> 
> Log both as AUDIT_CONFIG_CHANGE messages with failure result.
> 
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> ---
>  kernel/audit.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)

Same as 1/2, applied to the audit next queue.

> diff --git a/kernel/audit.c b/kernel/audit.c
> index 0368be2..9000c6f 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -882,11 +882,15 @@ static int audit_receive_msg(struct sk_buff *skb,
> struct nlmsghdr *nlh) int new_pid = s.pid;
>  			pid_t requesting_pid = task_tgid_vnr(current);
> 
> -			if ((!new_pid) && (requesting_pid != audit_pid))
> +			if ((!new_pid) && (requesting_pid != audit_pid)) {
> +				audit_log_config_change("audit_pid", new_pid, audit_pid, 0);
>  				return -EACCES;
> +			}
>  			if (audit_pid && new_pid &&
> -			    audit_replace(requesting_pid) != -ECONNREFUSED)
> +			    audit_replace(requesting_pid) != -ECONNREFUSED) {
> +				audit_log_config_change("audit_pid", new_pid, audit_pid, 0);
>  				return -EEXIST;
> +			}
>  			if (audit_enabled != AUDIT_OFF)
>  				audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
>  			audit_pid = new_pid;

-- 
paul moore
security @ redhat

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