linux-kernel - Re: [PATCH ghak90 V6 04/10] audit: log container info of syscalls

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Message-ID: <CAHC9VhRfQp-avV2rcEOvLCAXEz-MDZMp91UxU+BtvPkvWny9fQ@mail.gmail.com>
Date:   Wed, 29 May 2019 18:15:30 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     containers@...ts.linux-foundation.org, linux-api@...r.kernel.org,
        Linux-Audit Mailing List <linux-audit@...hat.com>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        sgrubb@...hat.com, omosnace@...hat.com, dhowells@...hat.com,
        simo@...hat.com, Eric Paris <eparis@...isplace.org>,
        Serge Hallyn <serge@...lyn.com>, ebiederm@...ssion.com,
        nhorman@...driver.com
Subject: Re: [PATCH ghak90 V6 04/10] audit: log container info of syscalls

On Mon, Apr 8, 2019 at 11:40 PM Richard Guy Briggs <rgb@...hat.com> wrote:
>
> Create a new audit record AUDIT_CONTAINER_ID to document the audit
> container identifier of a process if it is present.
>
> Called from audit_log_exit(), syscalls are covered.
>
> A sample raw event:
> type=SYSCALL msg=audit(1519924845.499:257): arch=c000003e syscall=257 success=yes exit=3 a0=ffffff9c a1=56374e1cef30 a2=241 a3=1b6 items=2 ppid=606 pid=635 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=3 comm="bash" exe="/usr/bin/bash" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key="tmpcontainerid"
> type=CWD msg=audit(1519924845.499:257): cwd="/root"
> type=PATH msg=audit(1519924845.499:257): item=0 name="/tmp/" inode=13863 dev=00:27 mode=041777 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:tmp_t:s0 nametype= PARENT cap_fp=0 cap_fi=0 cap_fe=0 cap_fver=0
> type=PATH msg=audit(1519924845.499:257): item=1 name="/tmp/tmpcontainerid" inode=17729 dev=00:27 mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=unconfined_u:object_r:user_tmp_t:s0 nametype=CREATE cap_fp=0 cap_fi=0 cap_fe=0 cap_fver=0
> type=PROCTITLE msg=audit(1519924845.499:257): proctitle=62617368002D6300736C65657020313B206563686F2074657374203E202F746D702F746D70636F6E7461696E65726964
> type=CONTAINER_ID msg=audit(1519924845.499:257): contid=123458
>
> Please see the github audit kernel issue for the main feature:
>   https://github.com/linux-audit/audit-kernel/issues/90
> Please see the github audit userspace issue for supporting additions:
>   https://github.com/linux-audit/audit-userspace/issues/51
> Please see the github audit testsuiite issue for the test case:
>   https://github.com/linux-audit/audit-testsuite/issues/64
> Please see the github audit wiki for the feature overview:
>   https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> Acked-by: Serge Hallyn <serge@...lyn.com>
> Acked-by: Steve Grubb <sgrubb@...hat.com>
> Acked-by: Neil Horman <nhorman@...driver.com>
> Reviewed-by: Ondrej Mosnacek <omosnace@...hat.com>
> ---
>  include/linux/audit.h      |  5 +++++
>  include/uapi/linux/audit.h |  1 +
>  kernel/audit.c             | 20 ++++++++++++++++++++
>  kernel/auditsc.c           | 20 ++++++++++++++------
>  4 files changed, 40 insertions(+), 6 deletions(-)

...

> diff --git a/kernel/audit.c b/kernel/audit.c
> index 182b0f2c183d..3e0af53f3c4d 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -2127,6 +2127,26 @@ void audit_log_session_info(struct audit_buffer *ab)
>         audit_log_format(ab, "auid=%u ses=%u", auid, sessionid);
>  }
>
> +/*
> + * audit_log_contid - report container info
> + * @context: task or local context for record
> + * @contid: container ID to report
> + */
> +void audit_log_contid(struct audit_context *context, u64 contid)
> +{
> +       struct audit_buffer *ab;
> +
> +       if (!audit_contid_valid(contid))
> +               return;
> +       /* Generate AUDIT_CONTAINER_ID record with container ID */
> +       ab = audit_log_start(context, GFP_KERNEL, AUDIT_CONTAINER_ID);
> +       if (!ab)
> +               return;
> +       audit_log_format(ab, "contid=%llu", (unsigned long long)contid);

We have a consistency problem regarding how to output the u64 contid
values; this function uses an explicit cast, others do not.  According
to Documentation/core-api/printk-formats.rst the recommendation for
u64 is %llu (or %llx, if you want hex).  Looking quickly through the
printk code this appears to still be correct.  I suggest we get rid of
the cast (like it was in v5).

> +       audit_log_end(ab);
> +}
> +EXPORT_SYMBOL(audit_log_contid);

--
paul moore
www.paul-moore.com