linux-kernel - Re: [PATCH] alloc_tag: Tighten file permissions on /proc/allocinfo

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Message-ID: <w6nbxvxt3itugrvtcvnayj5ducoxifwbffd7qh6vcastw77mse@2ugphwusgttz>
Date: Thu, 25 Apr 2024 16:45:51 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Kees Cook <keescook@...omium.org>
Cc: Suren Baghdasaryan <surenb@...gle.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] alloc_tag: Tighten file permissions on /proc/allocinfo

On Thu, Apr 25, 2024 at 01:08:50PM -0700, Kees Cook wrote:
> The /proc/allocinfo file exposes a tremendous about of information about
> kernel build details, memory allocations (obviously), and potentially
> even image layout (due to ordering). As this is intended to be consumed
> by system owners (like /proc/slabinfo), use the same file permissions as
> there: 0400.

Err...

The side effect of locking down more and more reporting interfaces is
that programs that consume those interfaces now have to run as root.

That's not what we want.