linux-kernel - Re: [PATCH 2/2] kernel/fork: handle put_user errors for CLONE_PARENT

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Message-ID: <20150206210738.GA18332@redhat.com>
Date:	Fri, 6 Feb 2015 22:07:38 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	Linux API <linux-api@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Nikita Vetoshkin <nekto0n@...dex-team.ru>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [PATCH 2/2] kernel/fork: handle put_user errors for
	CLONE_PARENT_SETTID

I am not sure about these changes too, but

On 02/06, Linus Torvalds wrote:
>
> What's the upside? If somebody passes in a bad pointer, it's their
> problem.

Yes. But unless I am totally confused (quite possible) this put_user()
can fail even if the pointer is valid.

So at least I think Konstantin has found a real problem. Which (I think)
shoud be fixed, and this is not connected to fork.

> insane with the whole "readable vs writable" thing.

Agreed, this part doesn't look nice in any case.

Oleg.

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