linux-kernel - Re: [PATCH v2] unshare: Unsharing a thread does not require unsharing a vm

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Message-ID: <20150813125704.GB13984@redhat.com>
Date:	Thu, 13 Aug 2015 14:57:04 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Ricky Zhou <rickyz@...omium.org>,
	Julien Tinnes <jln@...gle.com>
Subject: Re: [PATCH v2] unshare: Unsharing a thread does not require
	unsharing a vm

On 08/12, Eric W. Biederman wrote:
>
> +	if (unshare_flags & (CLONE_SIGHAND | CLONE_VM)) {
> +		if (atomic_read(&current->sighand->count) > 1)
> +			return -EINVAL;
> +	}

I am still not sure we want this... please the the previous email.

But perhaps I missed something.

Oleg.

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