linux-kernel - Re: [PATCH] selinux: add tracepoint on denials

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Message-ID: <CAJWu+orndyKTVTO-StUxnPsQ-TkbQHU5WxzOJ35EhckGfUzD1A@mail.gmail.com>
Date:   Tue, 28 Jul 2020 11:22:52 -0400
From:   Joel Fernandes <joelaf@...gle.com>
To:     Thiébaud Weksteen <tweek@...gle.com>
Cc:     Paul Moore <paul@...l-moore.com>, Nick Kralevich <nnk@...gle.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, selinux@...r.kernel.org
Subject: Re: [PATCH] selinux: add tracepoint on denials

On Fri, Jul 24, 2020 at 5:15 AM Thiébaud Weksteen <tweek@...gle.com> wrote:
>
> The audit data currently captures which process and which target
> is responsible for a denial. There is no data on where exactly in the
> process that call occurred. Debugging can be made easier by being able to
> reconstruct the unified kernel and userland stack traces [1]. Add a
> tracepoint on the SELinux denials which can then be used by userland
> (i.e. perf).
>
> Although this patch could manually be added by each OS developer to
> trouble shoot a denial, adding it to the kernel streamlines the
> developers workflow.
>
> [1] https://source.android.com/devices/tech/debug/native_stack_dump
>
> Signed-off-by: Thiébaud Weksteen <tweek@...gle.com>
> Signed-off-by: Joel Fernandes <joelaf@...gle.com>

While I am in support of the general idea, could you change my SOB to
something like Inspired-by?

This is really your patch, but I did demonstrate the idea in an
article where the intention was to apply a patch out of tree to do
stack dumps / tracing.  SOB on the other hand is supposed to track the
flow of a patch (the people who the patch goes through) when it is
sent upstream.

Thanks,

 - Joel