linux-kernel - Re: [PATCH v3 00/13] Virtually mapped stacks with guard pages (x86, core)

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Message-ID: <20160623171037.GB17372@redhat.com>
Date:	Thu, 23 Jun 2016 19:10:37 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Nadav Amit <nadav.amit@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Brian Gerst <brgerst@...il.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Jann Horn <jann@...jh.net>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH v3 00/13] Virtually mapped stacks with guard pages (x86,
 core)

On 06/23, Andy Lutomirski wrote:
>
> That sounds a bit more fragile than I'm really comfortable with,
> although it'll at least oops reliably if we get it wrong.
>
> But I'm planning on moving ti->flags (and the rest of thread_info,
> either piecemeal or as a unit) into task_struct on architectures that
> opt in,

I agree, this looks better. probably it should not be that hard to fix
GET_THREAD_INFO/etc, but you know this much better than me.

Oleg.