linux-kernel - Re: [PATCH] arm64: Add support for STACKLEAK gcc plugin

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Date:   Wed, 11 Jul 2018 19:06:25 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Alexander Popov <alex.popov@...ux.com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH] arm64: Add support for STACKLEAK gcc plugin

On Wed, Jul 11, 2018 at 6:45 PM, Laura Abbott <labbott@...hat.com> wrote:
>> +#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
>> +#define MIN_STACK_LEFT 256
>> +
>> +void __used stackleak_check_alloca(unsigned long size)
>> +{
>> +       unsigned long sp, stack_left;
>> +
>> +       sp = current_stack_pointer;
>> +
>> +       stack_left = sp & (THREAD_SIZE - 1);
>> +       BUG_ON(stack_left < MIN_STACK_LEFT ||
>> +               size >= stack_left - MIN_STACK_LEFT);
>> +}
>> +EXPORT_SYMBOL(stackleak_check_alloca);
>> +#endif
>
>
> I think the conclusion was this needs to be re-written to account
> for the different stack sizes in the same way as x86.

Oh, whoops! Sorry, I missed that fork of the thread. :)

-Kees

-- 
Kees Cook
Pixel Security