linux-kernel - Re: [PATCH v3 1/2] exec: add PR_HIDE_SELF

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <ceac106b-ddac-4ee6-bfdf-1505cc699eaa@app.fastmail.com>
Date:   Sun, 29 Jan 2023 08:59:32 -0500
From:   "Colin Walters" <walters@...bum.org>
To:     "Giuseppe Scrivano" <gscrivan@...hat.com>,
        "Aleksa Sarai" <cyphar@...har.com>
Cc:     linux-kernel@...r.kernel.org, "Kees Cook" <keescook@...omium.org>,
        bristot@...hat.com, "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Christian Brauner" <brauner@...nel.org>,
        "Al Viro" <viro@...iv.linux.org.uk>,
        "Alexander Larsson" <alexl@...hat.com>,
        "Peter Zijlstra" <peterz@...radead.org>, bmasney@...hat.com
Subject: Re: [PATCH v3 1/2] exec: add PR_HIDE_SELF_EXE prctl



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.