linux-kernel - Re: [PATCH] kasan: support use-after-scope detection

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Date:   Tue, 15 Nov 2016 15:40:02 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     aryabinin@...tuozzo.com, glider@...gle.com,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kasan: support use-after-scope detection

On Tue, 15 Nov 2016 17:07:25 +0100 Dmitry Vyukov <dvyukov@...gle.com> wrote:

> Gcc revision 241896 implements use-after-scope detection.
> Will be available in gcc 7. Support it in KASAN.
> 
> Gcc emits 2 new callbacks to poison/unpoison large stack
> objects when they go in/out of scope.
> Implement the callbacks and add a test.
> 
> ...
>
> --- a/lib/test_kasan.c
> +++ b/lib/test_kasan.c
> @@ -411,6 +411,29 @@ static noinline void __init copy_user_test(void)
>  	kfree(kmem);
>  }
>  
> +static noinline void __init use_after_scope_test(void)

This reader has no idea why this code uses noinline, and I expect
others will have the same issue.

Can we please get a code comment in there to reveal the reason?