linux-kernel - Re: [PATCH 1/2] integrity: Add errno field in audit message

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Message-ID: <CAHC9VhTZb_evUcdygs6MHP73Bi_r3esxV6+Ko6VDpncfmLYEZw@mail.gmail.com>
Date:   Wed, 10 Jun 2020 21:45:50 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
Cc:     zohar@...ux.ibm.com, sgrubb@...hat.com, rgb@...hat.com,
        linux-integrity@...r.kernel.org, linux-audit@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] integrity: Add errno field in audit message

On Wed, Jun 10, 2020 at 8:04 PM Lakshmi Ramasubramanian
<nramas@...ux.microsoft.com> wrote:
>
> Error code is not included in the audit messages logged by
> the integrity subsystem. Add a new field namely "errno" in
> the audit message and set the value to the error code passed
> to integrity_audit_msg() in the "result" parameter.
>
> Sample audit message:
>
> [    6.284329] audit: type=1804 audit(1591756723.627:2): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel op=add_boot_aggregate cause=alloc_entry errno=-12 comm="swapper/0" name="boot_aggregate" res=0
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
> Suggested-by: Steve Grubb <sgrubb@...hat.com>
> ---
>  security/integrity/integrity_audit.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
> index 5109173839cc..8cbf415bb977 100644
> --- a/security/integrity/integrity_audit.c
> +++ b/security/integrity/integrity_audit.c
> @@ -42,7 +42,8 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
>                          from_kuid(&init_user_ns, audit_get_loginuid(current)),
>                          audit_get_sessionid(current));
>         audit_log_task_context(ab);
> -       audit_log_format(ab, " op=%s cause=%s comm=", op, cause);
> +       audit_log_format(ab, " op=%s cause=%s errno=%d comm=",
> +                        op, cause, result);

Hi Lakshmi,

I'm sorry I didn't get a chance to mention this before you posted this
patch, but for the past several years we have been sticking with a
policy of only adding new fields to the end of existing records;
please adjust this patch accordingly.  Otherwise, this looks fine to
me.

>         audit_log_untrustedstring(ab, get_task_comm(name, current));
>         if (fname) {
>                 audit_log_format(ab, " name=");
> --
> 2.27.0

-- 
paul moore
www.paul-moore.com