linux-kernel - Re: [PATCH] selftests/exec: Avoid future NULL argv execve warning

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Date:   Wed, 2 Feb 2022 18:13:39 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Eric Biederman <ebiederm@...ssion.com>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        Ariadne Conill <ariadne@...eferenced.org>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Christian Brauner <brauner@...nel.org>,
        Rich Felker <dalias@...c.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] selftests/exec: Avoid future NULL argv execve warning

On Mon, Jan 31, 2022 at 04:08:07PM -0800, Kees Cook wrote:
> Build actual argv for launching recursion test to avoid future warning
> about using an empty argv in execve().

> --- a/tools/testing/selftests/exec/recursion-depth.c
> +++ b/tools/testing/selftests/exec/recursion-depth.c
> @@ -24,8 +24,14 @@
>  #include <sys/mount.h>
>  #include <unistd.h>
>  
> +#define FILENAME "/tmp/1"
> +#define HASHBANG "#!" FILENAME "\n"
> +
>  int main(void)
>  {
> +	char * const argv[] = { FILENAME, NULL };
> +	int rv;

Can we move out of -Wdeclaration-after-statement mentality in tests at least?

> -	int rv = execve(FILENAME, NULL, NULL);
> +	rv = execve(FILENAME, argv, NULL);

	int rv = execve(FILENAME, (char*[]){FILENAME, NULL}, NULL);

is cleaner (and modern)!

>  	if (rv == -1 && errno == ELOOP) {
>  		return 0;
>  	}