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Subject: Re: test_kmod.sh fails with constant blinding
To:     Yauheni Kaliuta <ykaliuta@redhat.com>, bpf <bpf@vger.kernel.org>
References: <CANoWsw=eP+kYHvT+AUwY=8D=QDrwHz=1_6he8vz0t+Tc1PVVBQ@mail.gmail.com>
From:   Daniel Borkmann <daniel@iogearbox.net>
Message-ID: <6e86e8c4-4eaf-3e4e-ee72-035a215b48d3@iogearbox.net>
Date:   Thu, 30 Jun 2022 22:57:37 +0200
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On 6/30/22 3:19 PM, Yauheni Kaliuta wrote:
> Hi!
> 
> test_kmod.sh fails for hardened 2 check with
> 
>   test_bpf: #964 Staggered jumps: JMP_JA FAIL to select_runtime err=-524
> 
> (-ERANGE during constant blinding)
> 
> Did I miss something?

That could be expected if one of bpf_adj_delta_to_imm() / bpf_adj_delta_to_off()
fails given the targets go out of range.

How do the generated insn look?

Thanks,
Daniel