linux-kernel - Re: [PATCH RFC] [5/9] modpost: Fix a buffer overflow in modpost

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Message-ID: <20071210193202.GC17315@uranus.ravnborg.org>
Date:	Mon, 10 Dec 2007 20:32:02 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andi Kleen <ak@...e.de>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	rusty@...tcorp.com.au
Subject: Re: [PATCH RFC] [5/9] modpost: Fix a buffer overflow in modpost

On Thu, Nov 22, 2007 at 03:43:10AM +0100, Andi Kleen wrote:
> 
> When passing an file name > 1k the stack could be overflowed.
> Not really a security issue, but still better plugged.

Looks good. A s-o-b line again please.
Although I am not so happy with the ue of gcc extensions.

	Sam
> 
> 
> ---
>  scripts/mod/modpost.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Index: linux/scripts/mod/modpost.c
> ===================================================================
> --- linux.orig/scripts/mod/modpost.c
> +++ linux/scripts/mod/modpost.c
> @@ -1656,7 +1656,6 @@ int main(int argc, char **argv)
>  {
>  	struct module *mod;
>  	struct buffer buf = { };
> -	char fname[SZ];
>  	char *kernel_read = NULL, *module_read = NULL;
>  	char *dump_write = NULL;
>  	int opt;
> @@ -1709,6 +1708,8 @@ int main(int argc, char **argv)
>  	err = 0;
>  
>  	for (mod = modules; mod; mod = mod->next) {
> +		char fname[strlen(mod->name) + 10];
> +
>  		if (mod->skip)
>  			continue;
>  
--
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