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Date:   Sun, 29 Jan 2023 08:59:32 -0500
From:   "Colin Walters" <walters@verbum.org>
To:     "Giuseppe Scrivano" <gscrivan@redhat.com>,
        "Aleksa Sarai" <cyphar@cyphar.com>
Cc:     linux-kernel@vger.kernel.org, "Kees Cook" <keescook@chromium.org>,
        bristot@redhat.com, "Eric W. Biederman" <ebiederm@xmission.com>,
        "Christian Brauner" <brauner@kernel.org>,
        "Al Viro" <viro@zeniv.linux.org.uk>,
        "Alexander Larsson" <alexl@redhat.com>,
        "Peter Zijlstra" <peterz@infradead.org>, bmasney@redhat.com
Subject: Re: [PATCH v3 1/2] exec: add PR_HIDE_SELF_EXE prctl
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On Wed, Jan 25, 2023, at 11:30 AM, Giuseppe Scrivano wrote:
> 
> After reading some comments on the LWN.net article, I wonder if
> PR_HIDE_SELF_EXE should apply to CAP_SYS_ADMIN in the initial user
> namespace or if in this case root should keep the privilege to inspect
> the binary of a process.  If a container runs with that many privileges
> then it has already other ways to damage the host anyway.

Right, that's what I was trying to express with the "make it work the same as map_files".  Hiding the entry entirely even for initial-namespace-root (real root) seems like it's going to potentially confuse profiling/tracing/debugging tools for no good reason.