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Subject: Re: [RFC][PATCH 7/7] kref: Implement using refcount_t
From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 15 Nov 2016 20:16:47 +0100
To: Kees Cook <keescook@chromium.org>, Ingo Molnar <mingo@kernel.org>
CC: Greg KH <gregkh@linuxfoundation.org>,
        Will Deacon <will.deacon@arm.com>,
        "Reshetova, Elena" <elena.reshetova@intel.com>,
        Arnd Bergmann <arnd@arndb.de>, Thomas Gleixner <tglx@linutronix.de>,
        "H. Peter Anvin" <hpa@zytor.com>, David Windsor <dave@progbits.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>
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On 15 November 2016 19:06:28 CET, Kees Cook <keescook@chromium.org> wrote:

>I'll want to modify this in the future; I have a config already doing
>"Bug on data structure corruption" that makes the warn/bug choice.
>It'll need some massaging to fit into the new refcount_t checks, but
>it should be okay -- there needs to be a way to complete the
>saturation, etc, but still kill the offending process group.

Ideally we'd create a new WARN like construct that continues in kernel space and terminates the process on return to user. That way there would be minimal kernel state corruption.