linux-kernel - Re: [PATCH v2] proc: allow restricting /proc/pid/mem writes

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Date: Tue, 5 Mar 2024 02:12:26 -0800
From: Kees Cook <keescook@...omium.org>
To: Christian Brauner <brauner@...nel.org>
Cc: Adrian Ratiu <adrian.ratiu@...labora.com>,
	linux-fsdevel@...r.kernel.org, kernel@...labora.com,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, Guenter Roeck <groeck@...omium.org>,
	Doug Anderson <dianders@...omium.org>, Jann Horn <jannh@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Mike Frysinger <vapier@...omium.org>
Subject: Re: [PATCH v2] proc: allow restricting /proc/pid/mem writes

On Tue, Mar 05, 2024 at 10:58:25AM +0100, Christian Brauner wrote:
> Since the write handler for /proc/<pid>/mem does raise FOLL_FORCE
> unconditionally it likely would implicitly. But I'm not familiar enough
> with FOLL_FORCE to say for sure.

I should phrase the question better. :) Is the supervisor writing into
read-only regions of the child process?

-- 
Kees Cook