linux-kernel - Re: vvar, gup && coredump

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Message-ID: <20150312180833.GC13711@redhat.com>
Date:	Thu, 12 Mar 2015 19:08:33 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	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>
Subject: Re: vvar, gup && coredump

On 03/12, Andy Lutomirski wrote:
>
> On Thu, Mar 12, 2015 at 10:39 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> > Well. Speaking of vdso. I understand that unlikely we can do this, but
> > for uprobes it would be nice to have a anon-inode file behind this mapping,
> > so that vma_interval_tree_foreach() could work, etc. OK, this is completely
> > off-topic, please forget.
>
> Couldn't you do that directly in the uprobes code?  That is, create an
> anon_inode file and just map it the old-fashioned way?

This won't help. Uprobes wants this file mmaped by all applications, so
that build_map_info() can find mm's, vma's, etc to install the system-wide
breakpoint. But again, this is off-topic and unlikely possible.

Oleg.

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