linux-kernel - Re: install_special_mapping && vm_pgoff (Was: vvar, gup && coredump)

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Message-ID: <20150316194446.GA21791@redhat.com>
Date:	Mon, 16 Mar 2015 20:44:46 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Sergio Durigan Junior <sergiodj@...hat.com>,
	GDB Patches <gdb-patches@...rceware.org>,
	Pedro Alves <palves@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: install_special_mapping && vm_pgoff (Was: vvar, gup &&
	coredump)

On 03/16, Andy Lutomirski wrote:
>
> Ick, you're probably right.  For what it's worth, the vdso *seems* to
> be okay (on 64-bit only, and only if you don't poke at it too hard) if
> you mremap it in one piece.  CRIU does that.

I need to run away till tomorrow, but looking at this code even if "one piece"
case doesn't look right if it was cow'ed. I'll verify tomorrow.

Oleg.

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