linux-kernel - Re: [PATCH v5 1/2] x86_64: remove not needed clear_page for init_level4

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Message-ID: <20150616113436.GG17786@pd.tnic>
Date:	Tue, 16 Jun 2015 13:34:36 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Alexander Popov <alpopov@...ecurity.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Andy Lutomirski <luto@...nel.org>,
	Alexander Kuleshov <kuleshovmail@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/2] x86_64: remove not needed clear_page for
 init_level4_page

On Tue, Jun 16, 2015 at 01:16:32PM +0200, Borislav Petkov wrote:
> Now my hunch is that those entries get overwritten later but I wouldn't
> want to debug any strange bugs from leftovers in init_level4_pgt so
> having the clear_page() is actually a good thing.

So I guess we can do that:

#ifndef CONFIG_KASAN
        clear_page(init_level4_pgt);
#endif

Hmm...

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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