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Date: Wed, 6 Dec 2017 10:15:35 +0000
From: Alexey Dokuchaev <danfe@FreeBSD.org>
To: Baptiste Daroussin <bapt@FreeBSD.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r326617 - head/usr.sbin/newsyslog
Message-ID: <20171206101535.GA8696@FreeBSD.org>
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On Wed, Dec 06, 2017 at 09:44:35AM +0000, Baptiste Daroussin wrote:
> New Revision: 326617
> URL: https://svnweb.freebsd.org/changeset/base/326617
> 
> Log:
>   Allow newsyslog to execute compression commands which
>   have a semantic different than the traditional gzip(1)
>   
>   This is done to allow to use zstd(1) as a compression tool without
>   having to patch it to change its default behavior.
> 
> Modified:
>   head/usr.sbin/newsyslog/newsyslog.c
> 
> Modified: head/usr.sbin/newsyslog/newsyslog.c
> ==============================================================================
> --- head/usr.sbin/newsyslog/newsyslog.c	Wed Dec  6 06:49:53 2017	(r326616)
> +++ head/usr.sbin/newsyslog/newsyslog.c	Wed Dec  6 09:44:35 2017	(r326617)
> @@ -151,14 +151,23 @@ struct compress_types {
>  	const char *flag;	/* Flag in configuration file */
>  	const char *suffix;	/* Compression suffix */
>  	const char *path;	/* Path to compression program */
> +	char **args;	/* Comrpession arguments */

Comrpession?

> +	strlcpy(command, pgm_path, sizeof(command));
> +	for (c = 1; args[c] != NULL; c++) {
> +		strlcat(command, " ", sizeof(command));
> +		strlcat(command, args[c], sizeof(command));
> +	}

I'm wondering if we should check strlcpy/strlcat() return values here and
abort early if someone is trying to overrun command buffer?

./danfe