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Date:   Thu, 20 Aug 2020 07:17:48 -0700
From:   Yonghong Song <>
To:     Andrii Nakryiko <>, <>,
        <>, <>, <>
CC:     <>, <>
Subject: Re: [PATCH bpf-next 1/4] libbpf: fix detection of BPF helper call

On 8/19/20 11:14 PM, Andrii Nakryiko wrote:
> BPF_CALL | BPF_JMP32 is explicitly not allowed by verifier for BPF helper
> calls, so don't detect it as a valid call. Also drop the check on func_id
> pointer, as it's currently always non-null.
> Reported-by: Yonghong Song <>
> Fixes: 109cea5a594f ("libbpf: Sanitize BPF program code for bpf_probe_read_{kernel, user}[_str]")
> Signed-off-by: Andrii Nakryiko <>

Acked-by: Yonghong Song <>

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