netdev - Re: [PATCH bpf] libbpf: sanitize VAR to conservative 1-byte INT

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Message-ID: <3ef85585-5f6b-9556-6896-536090b16f0a@fb.com>
Date:   Fri, 19 Jul 2019 19:50:05 +0000
From:   Alexei Starovoitov <ast@...com>
To:     Andrii Nakryiko <andriin@...com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        Andrey Ignatov <rdna@...com>
CC:     "andrii.nakryiko@...il.com" <andrii.nakryiko@...il.com>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf] libbpf: sanitize VAR to conservative 1-byte INT

On 7/19/19 12:46 PM, Andrii Nakryiko wrote:
> If VAR in non-sanitized BTF was size less than 4, converting such VAR
> into an INT with size=4 will cause BTF validation failure due to
> violationg of STRUCT (into which DATASEC was converted) member size.
> Fix by conservatively using size=1.
> 
> Signed-off-by: Andrii Nakryiko <andriin@...com>

Applied. Thanks