linux-kernel - Re: [PATCH 1/2] selftests: add a kselftest for SLUB debugging functionality

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Date:   Wed, 17 Mar 2021 11:54:10 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Oliver Glitta <glittao@...il.com>
cc:     cl@...ux.com, penberg@...nel.org, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org, vbabka@...e.cz, shuah@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 1/2] selftests: add a kselftest for SLUB debugging
 functionality

On Tue, 16 Mar 2021, glittao@...il.com wrote:

> From: Oliver Glitta <glittao@...il.com>
> 
> SLUB has resiliency_test() function which is hidden behind #ifdef
> SLUB_RESILIENCY_TEST that is not part of Kconfig, so nobody
> runs it. Kselftest should proper replacement for it.
> 
> Try changing byte in redzone after allocation and changing
> pointer to next free node, first byte, 50th byte and redzone
> byte. Check if validation finds errors.
> 
> There are several differences from the original resiliency test:
> Tests create own caches with known state instead of corrupting
> shared kmalloc caches.
> 
> The corruption of freepointer uses correct offset, the original
> resiliency test got broken with freepointer changes.
> 
> Scratch changing random byte test, because it does not have
> meaning in this form where we need deterministic results.
> 
> Add new option CONFIG_TEST_SLUB in Kconfig.
> 
> Add parameter to function validate_slab_cache() to return
> number of errors in cache.
> 
> Signed-off-by: Oliver Glitta <glittao@...il.com>

Acked-by: David Rientjes <rientjes@...gle.com>