linux-kernel - Re: [PATCH] proc: prevent a task from writing on its own /proc/*/mem

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Message-ID: <CAJHCu1LMzXeySHDXyXNpDbVjD2Lpu-dNTXFm3YhEuTnrU0tA9A@mail.gmail.com>
Date:   Sun, 10 Jun 2018 09:40:53 +0200
From:   Salvatore Mesoraca <s.mesoraca16@...il.com>
To:     Steve Kemp <steve.backup.kemp@...il.com>
Cc:     Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        LSM List <linux-security-module@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] proc: prevent a task from writing on its own /proc/*/mem

2018-06-04 18:57 GMT+02:00 Steve Kemp <steve.backup.kemp@...il.com>:
>> A configurable LSM is probably the right way to do this.
>
> I wonder how many out of tree LSM there are?  Looking at the mainline
> kernel the only "small" LSM bundled is YAMA, and it seems that most of
> the patches proposing new ones eventually die out.
>
> I appreciate that there are probably a lot of "toy" or "local" modules
> out there for specific fields, companies, or products, but it does
> seem odd that there are so few discussed publicly.
>
> (The last two I remember were S.A.R.A and something relating to
> xattr-attributes being used to whitelist execution.)

FWIW S.A.R.A. is not dead [1].
Unfortunately it needs infrastructure managed security blobs, so I didn't
tried to get it upstream, yet.
Of course, I can't give you any guarantees about when or if it will be
upstreamed,
but it's definitely still alive.

[1] https://github.com/smeso/sara/releases/latest