linux-kernel - Re: [patch] Avoid using hardcoded values in kernel/sys.c

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Date:	Mon, 17 Oct 2011 18:21:13 -0700
From:	Joe Perches <joe@...ches.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Henrik Grindal Bakken <henribak@...co.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] Avoid using hardcoded values in kernel/sys.c

On Mon, 2011-10-17 at 17:55 -0700, David Rientjes wrote:
> The release field of struct new_utsname may always change, so avoid
> hardcoded values when setting up a buffer to copy to it.

I don't think this is correct.

> diff --git a/kernel/sys.c b/kernel/sys.c
[]
> -static int override_release(char __user *release, int len)
> +static int override_release(char __user *release)
>  {
> +	const int len = sizeof(release);
>  	int ret = 0;
> -	char buf[65];
> +	char buf[len];

sizeof(release) = 4 or 8


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