linux-kernel - Re: + proc-clean-up-proc-pid-environ-handling.patch added to -mm tree

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Message-ID: <20120208151516.GA15570@redhat.com>
Date:	Wed, 8 Feb 2012 16:15:16 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	WANG Cong <xiyou.wangcong@...il.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: + proc-clean-up-proc-pid-environ-handling.patch added to -mm
	tree

> From: Cong Wang <xiyou.wangcong@...il.com>
> Subject: proc: clean up /proc/<pid>/environ handling
>
> Similar to e268337dfe2 ("proc: clean up and fix /proc/<pid>/mem
> handling"),

and has the same problem,

> move the check of permission to open(), this will simplify
> read() code.

but allows to kill the system trivially.

Please look at 6d08f2c7139790c268820a2e590795cb8333181a
"proc: make sure mem_open() doesn't pin the target's memory"

Oleg.

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