linux-kernel - Re: [PATCH v7 0/9] KFENCE: A low-overhead sampling-based memory safety error detector

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Message-Id: <20201103163103.109deb9d49a140032d67434f@linux-foundation.org>
Date:   Tue, 3 Nov 2020 16:31:03 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Marco Elver <elver@...gle.com>
Cc:     glider@...gle.com, hpa@...or.com, paulmck@...nel.org,
        andreyknvl@...gle.com, aryabinin@...tuozzo.com, luto@...nel.org,
        bp@...en8.de, catalin.marinas@....com, cl@...ux.com,
        dave.hansen@...ux.intel.com, rientjes@...gle.com,
        dvyukov@...gle.com, edumazet@...gle.com,
        gregkh@...uxfoundation.org, hdanton@...a.com, mingo@...hat.com,
        jannh@...gle.com, Jonathan.Cameron@...wei.com, corbet@....net,
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        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
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        linux-mm@...ck.org
Subject: Re: [PATCH v7 0/9] KFENCE: A low-overhead sampling-based memory
 safety error detector

On Tue,  3 Nov 2020 18:58:32 +0100 Marco Elver <elver@...gle.com> wrote:

> This adds the Kernel Electric-Fence (KFENCE) infrastructure. KFENCE is a
> low-overhead sampling-based memory safety error detector of heap
> use-after-free, invalid-free, and out-of-bounds access errors.  This
> series enables KFENCE for the x86 and arm64 architectures, and adds
> KFENCE hooks to the SLAB and SLUB allocators.
> 
> KFENCE is designed to be enabled in production kernels, and has near
> zero performance overhead. Compared to KASAN, KFENCE trades performance
> for precision. The main motivation behind KFENCE's design, is that with
> enough total uptime KFENCE will detect bugs in code paths not typically
> exercised by non-production test workloads. One way to quickly achieve a
> large enough total uptime is when the tool is deployed across a large
> fleet of machines.

Has kfence detected any kernel bugs yet?  What is its track record?

Will a kfence merge permit us to remove some other memory debugging
subsystem?  We seem to have rather a lot of them.