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From: Stephen Smalley <sds@tycho.nsa.gov>
To: Richard Haines <richard_c_haines@btinternet.com>,
	selinux@vger.kernel.org
Subject: Re: [PATCH 1/1] selinux-testsuite: Add perf_event tests
Date: Tue, 3 Dec 2019 10:15:17 -0500
Message-ID: <a715e047-7973-2847-96c4-5f26cd29adb2@tycho.nsa.gov> (raw)
In-Reply-To: <20191201145238.265621-2-richard_c_haines@btinternet.com>

On 12/1/19 9:52 AM, Richard Haines wrote:
> Test perf_event permissions.
> 
> Signed-off-by: Richard Haines <richard_c_haines@btinternet.com>
> ---

> diff --git a/policy/test_perf_event.te b/policy/test_perf_event.te
> new file mode 100644
> index 0000000..8b612bc
> --- /dev/null
> +++ b/policy/test_perf_event.te
<snip>
> +neverallow test_perf_no_admin_t self:capability { sys_admin };

I don't particularly object to this, but I wanted to note that these 
neverallows are not being checked by default (expand-check=0 in 
/etc/selinux/semanage.conf) and in fact, if one were to enable 
expand-check, it would not be possible to insert the test policy module 
without triggering some neverallow and/or typebounds failures because 
the test policy intentionally violates such invariants at points.

Even the base Fedora policy doesn't appear to pass neverallow checking 
at present; if you enable expand-check=1 in /etc/selinux/semanage.conf 
and semodule -B, it fails (at least for me).

So your neverallow rules in the test policy are at best documentation.

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-01 14:52 [PATCH 0/1] " Richard Haines
2019-12-01 14:52 ` [PATCH 1/1] " Richard Haines
2019-12-03 15:15   ` Stephen Smalley [this message]
2019-12-03 16:00     ` Richard Haines

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