linux-kernel - Re: [PATCH] x86/boot: Rename overlapping memcpy() to memmove()

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Date:	Sat, 23 Apr 2016 13:08:37 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	Yinghai Lu <yinghai@...nel.org>, Baoquan He <bhe@...hat.com>,
	Borislav Petkov <bp@...e.de>, Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	"H.J. Lu" <hjl.tools@...il.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Andy Lutomirski <luto@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/boot: Rename overlapping memcpy() to memmove()


* Kees Cook <keescook@...omium.org> wrote:

> --- a/arch/x86/boot/compressed/string.c
> +++ b/arch/x86/boot/compressed/string.c
> @@ -1,7 +1,13 @@
> +/*
> + * This provides an optimized implementation of memcpy, and a simplified
> + * implementation of memset and memmove, to avoid problems with the
> + * built-in implementations when running in the restricted decompression
> + * stub environment.
> + */

Does 'built in' here mean the compiler's implementation?

We cannot call kernel built-in functions yet, so we have to duplicate everything 
we might need, right?

Thanks,

	Ingo