linux-kernel - Re: StackProtector Oopses

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Date:	Mon, 21 Apr 2008 22:04:27 -0400
From:	Valdis.Kletnieks@...edu
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Reuben Farrelly <reuben-linuxkernel@...b.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: StackProtector Oopses - Re: 2.6.25-mm1

On Mon, 21 Apr 2008 18:48:59 PDT, Arjan van de Ven said:

Typo alert?

> diff --git a/kernel/panic.c b/kernel/panic.c
> index c92c1e2..b4a6a05 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -351,7 +351,10 @@ static noinline void __stack_chk_test_func(void)
>  	}
>  #endif
>  	barrier();
> -	memset(&foo, 0, 2*sizeof(foo)); /* deliberate buffer overflow */
> +	if (current->stack_canary == *(((unsigned long *)&foo)+1))
> +		*(((unsigned long *)&foo)+1) = 0;
> +	else
> +		printk(KERN_ERR "No -ftack-protector canary found\n");
                                     -fstack?
>  	barrier();
>  }


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