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Message-ID: <20181125124732.6c1807de@lwn.net>
Date: Sun, 25 Nov 2018 12:47:32 -0700
From: Jonathan Corbet <corbet@....net>
To: Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Kees Cook <keescook@...omium.org>,
Jann Horn <jannh@...gle.com>, Ingo Molnar <mingo@...hat.com>, Peter
Zijlstra <peterz@...radead.org>, Arnaldo Carvalho de Melo
<acme@...nel.org>, Andi Kleen <ak@...ux.intel.com>, Alexander Shishkin
<alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
Tvrtko Ursulin <tursulin@...ulin.net>, linux-kernel
<linux-kernel@...r.kernel.org>, "kernel-hardening@...ts.openwall.com"
<kernel-hardening@...ts.openwall.com>, "linux-doc@...r.kernel.org"
<linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] Documentation/admin-guide: introduce
perf-security.rst file
On Wed, 21 Nov 2018 12:14:14 +0300
Alexey Budankov <alexey.budankov@...ux.intel.com> wrote:
> +For the purpose of performing security checks Linux implementation splits
> +processes into two categories [6]_ : a) privileged processes (whose effective
> +user ID is 0, referred to as superuser or root), and b) unprivileged processes
> +(whose effective UID is nonzero).
Is that really what's going on here? If I understand things correctly,
it's looking for CAP_SYS_PTRACE rather than a specific UID; am I missing
something here?
(Also, you would want "*the* Linux implementation" in the first sentence
above).
One other thing:
> +(whose effective UID is nonzero). Privileged processes bypass all kernel
> +security permission checks so perf_events performance monitoring is fully
> +available to privileged processes without *access*, *scope* and *resource*
> +restrictions.
Could I ask for a slight toning down of the markup here? There's a lot of
*emphasis* here that isn't really needed and tends to get in the way.
Thanks,
jon
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