linux-kernel - Re: [PATCH v3] kernel: add panic_on

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Message-ID: <202005091159.A317BEFF@keescook>
Date:   Sat, 9 May 2020 11:59:10 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Rafael Aquini <aquini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        kexec@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        dyoung@...hat.com, bhe@...hat.com, corbet@....net,
        mcgrof@...nel.org, akpm@...ux-foundation.org, cai@....pw,
        rdunlap@...radead.org, tytso@....edu, bunk@...nel.org,
        torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        labbott@...hat.com, jeffm@...e.com, jikos@...nel.org, jeyu@...e.de,
        tiwai@...e.de, AnDavis@...e.com, rpalethorpe@...e.de
Subject: Re: [PATCH v3] kernel: add panic_on_taint

On Sat, May 09, 2020 at 09:57:37AM -0400, Rafael Aquini wrote:
> 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.
> 
> 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.
> 
> Suggested-by: Qian Cai <cai@....pw>
> Signed-off-by: Rafael Aquini <aquini@...hat.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook