linux-kernel - Re: [PATCH v35 23/29] Audit: Create audit

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Message-ID: <26eca0aa-111a-9473-8925-e4b12cadbd79@canonical.com>
Date:   Tue, 26 Apr 2022 11:58:21 -0700
From:   John Johansen <john.johansen@...onical.com>
To:     Paul Moore <paul@...l-moore.com>
Cc:     Casey Schaufler <casey@...aufler-ca.com>,
        casey.schaufler@...el.com, jmorris@...ei.org,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org,
        linux-audit@...hat.com, keescook@...omium.org,
        penguin-kernel@...ove.sakura.ne.jp, stephen.smalley.work@...il.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v35 23/29] Audit: Create audit_stamp structure

On 4/26/22 11:03, Paul Moore wrote:
> On Mon, Apr 25, 2022 at 7:31 PM John Johansen
> <john.johansen@...onical.com> wrote:
>> On 4/18/22 07:59, Casey Schaufler wrote:
>>> Replace the timestamp and serial number pair used in audit records
>>> with a structure containing the two elements.
>>>
>>> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
>>> Acked-by: Paul Moore <paul@...l-moore.com>
>>> ---
>>>  kernel/audit.c   | 17 +++++++++--------
>>>  kernel/audit.h   | 12 +++++++++---
>>>  kernel/auditsc.c | 22 +++++++++-------------
>>>  3 files changed, 27 insertions(+), 24 deletions(-)
> 
> ...
> 
>>> diff --git a/kernel/audit.h b/kernel/audit.h
>>> index 4af63e7dde17..260dab6e0e15 100644
>>> --- a/kernel/audit.h
>>> +++ b/kernel/audit.h
>>> @@ -108,10 +114,10 @@ struct audit_context {
>>>               AUDIT_CTX_URING,        /* in use by io_uring */
>>>       } context;
>>>       enum audit_state    state, current_state;
>>> +     struct audit_stamp  stamp;      /* event identifier */
>>>       unsigned int        serial;     /* serial number for record */
>>
>> shouldn't we be dropping serial from the audit_context, since we have
>> moved it into the audit_stamp?
> 
> Unless we make some significant changes to audit_log_start() we still
> need to preserve a timestamp in the audit_context so that regularly
> associated audit records can share a common timestamp (which is what
> groups multiple records into a single "event").
> 
sure, but the patch changes things to use ctx->stamp.serial instead of
ctx->serial. Eg. in audit_reset_context() we have

-	ctx->serial = 0;
+	ctx->stamp.serial = 0;

I don't see a reason why we need both ctx->serial and ctx->stamp.serial