linux-kernel - Re: next: x86_64: kunit test crashed and kernel panic

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Date:   Thu, 16 Feb 2023 17:34:33 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     kasan-dev <kasan-dev@...glegroups.com>,
        open list <linux-kernel@...r.kernel.org>,
        kunit-dev@...glegroups.com, lkft-triage@...ts.linaro.org,
        regressions@...ts.linux.dev, Marco Elver <elver@...gle.com>,
        Anders Roxell <anders.roxell@...aro.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: next: x86_64: kunit test crashed and kernel panic

On Thu, Feb 16, 2023 at 1:13 PM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
>
> Following kernel panic noticed while running KUNIT testing on qemu-x86_64
> with KASAN enabled kernel.
>
> CONFIG_KASAN=y
> CONFIG_KUNIT=y
> CONFIG_KUNIT_ALL_TESTS=y
>

This is reproducible for me locally, taking a look...


> <4>[   38.796558]  ? kmalloc_memmove_negative_size+0xeb/0x1f0
> <4>[   38.797376]  ? __pfx_kmalloc_memmove_negative_size+0x10/0x10

Most certainly kmalloc_memmove_negative_size() is related.
Looks like we fail to intercept the call to memmove() in this test,
passing -2 to the actual __memmove().