linux-kernel - Re: [PATCH v16 00/12] bpf: Add kfuncs for PKCS#7 signature verification

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Date:   Mon, 5 Sep 2022 21:26:25 +0200
From:   Kumar Kartikeya Dwivedi <memxor@...il.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, mykolal@...com,
        dhowells@...hat.com, jarkko@...nel.org, rostedt@...dmis.org,
        mingo@...hat.com, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com, shuah@...nel.org, bpf@...r.kernel.org,
        keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        deso@...teo.net, Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v16 00/12] bpf: Add kfuncs for PKCS#7 signature verification

On Mon, 5 Sept 2022 at 16:34, Roberto Sassu
<roberto.sassu@...weicloud.com> wrote:
>
> From: Roberto Sassu <roberto.sassu@...wei.com>
>
> One of the desirable features in security is the ability to restrict import
> of data to a given system based on data authenticity. If data import can be
> restricted, it would be possible to enforce a system-wide policy based on
> the signing keys the system owner trusts.
>
> This feature is widely used in the kernel. For example, if the restriction
> is enabled, kernel modules can be plugged in only if they are signed with a
> key whose public part is in the primary or secondary keyring.
>
> For eBPF, it can be useful as well. For example, it might be useful to
> authenticate data an eBPF program makes security decisions on.
>
> [...]

CI is crashing with NULL deref for test_progs-no_alu32 with llvm-16,
but I don't think the problem is in this series. This is most likely
unrelated to BPF, as the crash happens inside
kernel/time/tick-sched.c:tick_nohz_restart_sched_tick.

This was the same case in
https://lore.kernel.org/bpf/CAP01T74steDfP6O8QOshoto3e3RnHhKtAeTbnrPBZS3YJXjvbA@mail.gmail.com.

So, https://github.com/kernel-patches/bpf/runs/8194263557?check_suite_focus=true
and https://github.com/kernel-patches/bpf/runs/7982907380?check_suite_focus=true

look similar to me, and may not be related to BPF. They only trigger
during runs compiled using LLVM 16, so maybe some compiler
transformation is surfacing the problem?