From: Peter Robinson <pbrobinson@gmail.com>
To: Stefan Wahren <stefan.wahren@i2se.com>
Cc: bpf@vger.kernel.org, jpalus@fastmail.com,
regressions@lists.linux.dev, Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Shubham Bansal <illusionist.neo@gmail.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [BUG] null pointer dereference when loading bpf_preload on Raspberry Pi
Date: Wed, 15 Jun 2022 11:07:48 +0100 [thread overview]
Message-ID: <CALeDE9PB+25eq7ouxuhPj7-mOLT00CyRh4sAeKYkqvoDtPUo=w@mail.gmail.com> (raw)
In-Reply-To: <05b3ae90-b66b-84c4-b525-dbab3aa677eb@i2se.com>
Hi Stefan,
> >>> Jan Palus already reported this NULL pointer dereference on bugzilla
> >>> [1], but i want to make sure this is noticed by the right people.
> >>>
> >>> I've i boot my Raspberry Pi 3 B Plus with multi_v7_defconfig and the
> >>> following config settings:
> >>>
> >>> CONFIG_BPF_SYSCALL=y
> >>> CONFIG_BPF_JIT=y
> >>> CONFIG_BPF_JIT_ALWAYS_ON=y
> >>> CONFIG_BPF_JIT_DEFAULT_ON=y
> >>> CONFIG_BPF_UNPRIV_DEFAULT_OFF=y
> >>> CONFIG_USERMODE_DRIVER=y
> >>> CONFIG_BPF_PRELOAD=y
> >>> CONFIG_BPF_PRELOAD_UMD=m
> >> are you able to see this issue in 5.18.x, too? I'm asking because the
> >> BPF settings comes from your configuration.
> > I've not seen it in a standard boot, is there a simple way to test
> > this, TBH I've never really played with bpf (it's on the todo list) so
> > if there's an easy test I can certainly check.
>
> it's just during boot. No need to do something special.
>
> I want to figure out, if this is caused by my cross compile environment.
No, not seeing that anywhere, I've got 5.18.3 running on omap/rpi/imx6
32 bit devices without anything like that
We had an issue around BPF on arm32 back in late 2018 and I tried to
turn some of the options on in defconfig so they'd have wider testing
but got push back. I don't remember the exact issue there though (and
it's long been fixed)
Peter
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next prev parent reply other threads:[~2022-06-15 10:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-12 22:22 [BUG] null pointer dereference when loading bpf_preload on Raspberry Pi Stefan Wahren
2022-06-13 11:12 ` Russell King (Oracle)
2022-06-13 14:42 ` Stefan Wahren
2022-06-15 6:11 ` Stefan Wahren
2022-06-15 8:31 ` Peter Robinson
2022-06-15 9:57 ` Stefan Wahren
2022-06-15 10:07 ` Peter Robinson [this message]
2022-06-19 17:06 ` Thorsten Leemhuis
2022-09-03 14:17 ` Stefan Wahren
2022-09-03 14:44 ` Stefan Wahren
2022-09-04 9:28 ` Thorsten Leemhuis
2022-07-04 12:42 ` Thorsten Leemhuis
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