linux-kernel - Re: [PATCH v3 1/2] integrity: Add errno field in audit message

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Date:   Tue, 23 Jun 2020 20:07:13 -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 v3 1/2] integrity: Add errno field in audit message

On Thu, Jun 18, 2020 at 5:10 PM Lakshmi Ramasubramanian
<nramas@...ux.microsoft.com> wrote:
>
> Error code is not included in the audit messages logged by
> the integrity subsystem.
>
> Define a new function integrity_audit_message() that takes error code
> in the "errno" parameter. Add "errno" field in the audit messages logged
> by the integrity subsystem and set the value passed in the "errno"
> parameter.
>
> [    6.303048] audit: type=1804 audit(1592506281.627:2): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel op=measuring_key cause=ENOMEM comm="swapper/0" name=".builtin_trusted_keys" res=0 errno=-12
>
> [    7.987647] audit: type=1802 audit(1592506283.312:9): 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
>
> [    8.019432] audit: type=1804 audit(1592506283.344:10): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 op=measuring_kexec_cmdline cause=hashing_error comm="systemd" name="kexec-cmdline" res=0 errno=-22
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
> Suggested-by: Steve Grubb <sgrubb@...hat.com>
> Suggested-by: Mimi Zohar <zohar@...ux.ibm.com>
> ---
>  security/integrity/integrity.h       | 13 +++++++++++++
>  security/integrity/integrity_audit.c | 11 ++++++++++-
>  2 files changed, 23 insertions(+), 1 deletion(-)

The audit record changes look good to me.

Acked-by: Paul Moore <paul@...l-moore.com>

> diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
> index 16c1894c29bb..413c803c5208 100644
> --- a/security/integrity/integrity.h
> +++ b/security/integrity/integrity.h
> @@ -239,6 +239,11 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
>                          const unsigned char *fname, const char *op,
>                          const char *cause, int result, int info);
>
> +void integrity_audit_message(int audit_msgno, struct inode *inode,
> +                            const unsigned char *fname, const char *op,
> +                            const char *cause, int result, int info,
> +                            int errno);
> +
>  static inline struct audit_buffer *
>  integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
>  {
> @@ -253,6 +258,14 @@ static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
>  {
>  }
>
> +static inline void integrity_audit_message(int audit_msgno,
> +                                          struct inode *inode,
> +                                          const unsigned char *fname,
> +                                          const char *op, const char *cause,
> +                                          int result, int info, int errno)
> +{
> +}
> +
>  static inline struct audit_buffer *
>  integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
>  {
> diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
> index 5109173839cc..f25e7df099c8 100644
> --- a/security/integrity/integrity_audit.c
> +++ b/security/integrity/integrity_audit.c
> @@ -28,6 +28,15 @@ __setup("integrity_audit=", integrity_audit_setup);
>  void integrity_audit_msg(int audit_msgno, struct inode *inode,
>                          const unsigned char *fname, const char *op,
>                          const char *cause, int result, int audit_info)
> +{
> +       integrity_audit_message(audit_msgno, inode, fname, op, cause,
> +                               result, audit_info, 0);
> +}
> +
> +void integrity_audit_message(int audit_msgno, struct inode *inode,
> +                            const unsigned char *fname, const char *op,
> +                            const char *cause, int result, int audit_info,
> +                            int errno)
>  {
>         struct audit_buffer *ab;
>         char name[TASK_COMM_LEN];
> @@ -53,6 +62,6 @@ 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, errno);
>         audit_log_end(ab);
>  }
> --
> 2.27.0
>


-- 
paul moore
www.paul-moore.com