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SubjectRe: [PATCH 2/2] integrity: Add errno field in audit message
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On Wed, 2020-06-17 at 13:44 -0700, Lakshmi Ramasubramanian wrote:
> Error code is not included in the audit messages logged by
> the integrity subsystem. Add "errno" field in the audit messages
> logged by the integrity subsystem and set the value to the error code
> passed to integrity_audit_msg() in the "result" parameter.
>
> Sample audit messages:
>
> [ 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 comm="swapper/0" name="boot_aggregate" res=0 errno=-12
>
> [ 8.085456] audit: type=1802 audit(1592005947.297:9): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 op=policy_update cause=completed comm="systemd" res=1 errno=0
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Steve Grubb <sgrubb@redhat.com>
> ---
> security/integrity/integrity_audit.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
> index 5109173839cc..a265024f82f3 100644
> --- a/security/integrity/integrity_audit.c
> +++ b/security/integrity/integrity_audit.c
> @@ -53,6 +53,6 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
> audit_log_untrustedstring(ab, inode->i_sb->s_id);
> audit_log_format(ab, " ino=%lu", inode->i_ino);
> }
> - audit_log_format(ab, " res=%d", !result);
> + audit_log_format(ab, " res=%d errno=%d", !result, result);
> audit_log_end(ab);
> }

For the reasons that I mentioned previously, unless others are willing
to add their Reviewed-by tag not for the audit aspect in particular,
but IMA itself, I'm not comfortable making this change all at once.

Previously I suggested making the existing integrity_audit_msg() a
wrapper for a new function with errno.  Steve said, "We normally do
not like to have fields that swing in and out ...", but said setting
errno to 0 is fine.  The original integrity_audit_msg() function would
call the new function with errno set to 0.

Mimi

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