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SubjectRe: [PATCH ghak90 V8 05/16] audit: log drop of contid on exit of last task
On Tue, Dec 31, 2019 at 2:50 PM Richard Guy Briggs <rgb@redhat.com> wrote:
>
> Since we are tracking the life of each audit container indentifier, we
> can match the creation event with the destruction event. Log the
> destruction of the audit container identifier when the last process in
> that container exits.
>
> Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
> ---
> kernel/audit.c | 17 +++++++++++++++++
> kernel/audit.h | 2 ++
> kernel/auditsc.c | 2 ++
> 3 files changed, 21 insertions(+)
>
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 4bab20f5f781..fa8f1aa3a605 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -2502,6 +2502,23 @@ int audit_set_contid(struct task_struct *task, u64 contid)
> return rc;
> }
>
> +void audit_log_container_drop(void)
> +{
> + struct audit_buffer *ab;
> +
> + if (!current->audit || !current->audit->cont ||
> + refcount_read(&current->audit->cont->refcount) > 1)
> + return;
> + ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONTAINER_OP);
> + if (!ab)
> + return;
> +
> + audit_log_format(ab, "op=drop opid=%d contid=%llu old-contid=%llu",
> + task_tgid_nr(current), audit_get_contid(current),
> + audit_get_contid(current));
> + audit_log_end(ab);
> +}

Assumine we are careful about where we call it in audit_free(...), you
are confident we can't do this as part of _audit_contobj_put(...),
yes?


> /**
> * audit_log_end - end one audit record
> * @ab: the audit_buffer
> diff --git a/kernel/audit.h b/kernel/audit.h
> index e4a31aa92dfe..162de8366b32 100644
> --- a/kernel/audit.h
> +++ b/kernel/audit.h
> @@ -255,6 +255,8 @@ extern void audit_log_d_path_exe(struct audit_buffer *ab,
> extern struct tty_struct *audit_get_tty(void);
> extern void audit_put_tty(struct tty_struct *tty);
>
> +extern void audit_log_container_drop(void);
> +
> /* audit watch/mark/tree functions */
> #ifdef CONFIG_AUDITSYSCALL
> extern unsigned int audit_serial(void);
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 0e2d50533959..bd855794ad26 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -1568,6 +1568,8 @@ static void audit_log_exit(void)
>
> audit_log_proctitle();
>
> + audit_log_container_drop();
> +
> /* Send end of event record to help user space know we are finished */
> ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
> if (ab)
> --
> 1.8.3.1
>

--
paul moore
www.paul-moore.com

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