[PATCH v3 2/5] selftests/landlock: Fix socket file descriptor leaks in audit helpers

[Günther Noack]

On Thu, Apr 02, 2026 at 09:26:03PM +0200, Mickaël Salaün wrote:
> audit_init() opens a netlink socket and configures it, but leaks the
> file descriptor if audit_set_status() or setsockopt() fails.  Fix this
> by jumping to an error path that closes the socket before returning.
> 
> Apply the same fix to audit_init_with_exe_filter(), which leaks the file
> descriptor from audit_init() if audit_init_filter_exe() or
> audit_filter_exe() fails, and to audit_cleanup(), which leaks it if
> audit_init_filter_exe() fails in FIXTURE_TEARDOWN_PARENT().
> 
> Cc: Günther Noack <gnoack at google.com>
> Cc: stable at vger.kernel.org
> Fixes: 6a500b22971c ("selftests/landlock: Add tests for audit flags and domain IDs")
> Signed-off-by: Mickaël Salaün <mic at digikod.net>
> ---
> 
> Changes since v1:
> https://lore.kernel.org/r/20260312100444.2609563-8-mic@digikod.net
> - New patch (split from the drain fix, extended to
>   audit_init_with_exe_filter() and audit_cleanup()).
> ---
>  tools/testing/selftests/landlock/audit.h | 26 +++++++++++++++++-------
>  1 file changed, 19 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/testing/selftests/landlock/audit.h b/tools/testing/selftests/landlock/audit.h
> index 1049a0582af5..6422943fc69e 100644
> --- a/tools/testing/selftests/landlock/audit.h
> +++ b/tools/testing/selftests/landlock/audit.h
> @@ -379,19 +379,25 @@ static int audit_init(void)
>  
>  	err = audit_set_status(fd, AUDIT_STATUS_ENABLED, 1);
>  	if (err)
> -		return err;
> +		goto err_close;
>  
>  	err = audit_set_status(fd, AUDIT_STATUS_PID, getpid());
>  	if (err)
> -		return err;
> +		goto err_close;
>  
>  	/* Sets a timeout for negative tests. */
>  	err = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &audit_tv_default,
>  			 sizeof(audit_tv_default));
> -	if (err)
> -		return -errno;
> +	if (err) {
> +		err = -errno;
> +		goto err_close;
> +	}
>  
>  	return fd;
> +
> +err_close:
> +	close(fd);
> +	return err;
>  }
>  
>  static int audit_init_filter_exe(struct audit_filter *filter, const char *path)
> @@ -441,8 +447,10 @@ static int audit_cleanup(int audit_fd, struct audit_filter *filter)
>  
>  		filter = &new_filter;
>  		err = audit_init_filter_exe(filter, NULL);
> -		if (err)
> +		if (err) {
> +			close(audit_fd);
>  			return err;
> +		}
>  	}
>  
>  	/* Filters might not be in place. */
> @@ -468,11 +476,15 @@ static int audit_init_with_exe_filter(struct audit_filter *filter)
>  
>  	err = audit_init_filter_exe(filter, NULL);
>  	if (err)
> -		return err;
> +		goto err_close;
>  
>  	err = audit_filter_exe(fd, filter, AUDIT_ADD_RULE);
>  	if (err)
> -		return err;
> +		goto err_close;
>  
>  	return fd;
> +
> +err_close:
> +	close(fd);
> +	return err;
>  }
> -- 
> 2.53.0
> 

Reviewed-by: Günther Noack <gnoack3000 at gmail.com>