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Subject: Re: [PATCH] kernel: add panic_on_taint
From:   Qian Cai <cai@lca.pw>
In-Reply-To: <20200507204219.GJ205881@optiplex-lnx>
Date:   Thu, 7 May 2020 18:05:27 -0400
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, linux-doc@vger.kernel.org,
        kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org,
        dyoung@redhat.com, Baoquan He <bhe@redhat.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Kees Cook <keescook@chromium.org>
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Message-Id: <27AA744E-930A-492A-BE87-05A119FE1549@lca.pw>
References: <20200506222815.274570-1-aquini@redhat.com>
 <C5E11731-5503-45CC-9F72-41E8863ACD27@lca.pw>
 <20200507204219.GJ205881@optiplex-lnx>
To:     Rafael Aquini <aquini@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
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> On May 7, 2020, at 4:42 PM, Rafael Aquini <aquini@redhat.com> wrote:
>=20
> On Wed, May 06, 2020 at 10:50:19PM -0400, Qian Cai wrote:
>>=20
>>=20
>>> On May 6, 2020, at 6:28 PM, Rafael Aquini <aquini@redhat.com> wrote:
>>>=20
>>> Analogously to the introduction of panic_on_warn, this patch
>>> introduces a kernel option named panic_on_taint in order to
>>> provide a simple and generic way to stop execution and catch
>>> a coredump when the kernel gets tainted by any given taint flag.
>>>=20
>>> This is useful for debugging sessions as it avoids rebuilding
>>> the kernel to explicitly add calls to panic() or BUG() into
>>> code sites that introduce the taint flags of interest.
>>> Another, perhaps less frequent, use for this option would be
>>> as a mean for assuring a security policy (in paranoid mode)
>>> case where no single taint is allowed for the running system.
>>=20
>> Andrew, you can drop the patch below from -mm now because that one is =
now obsolete,
>>=20
>> mm-slub-add-panic_on_error-to-the-debug-facilities.patch
>>=20
> Please, don't drop it yet. I'll send a patch to get rid of the bits,
> once this one gets accepted, if it gets accepted.

Why do you ever want that obsolete patch even show up in linux-next to =
potentailly waste other people/bots time to test it and develop things =
on top of it?=