netdev - Re: [PATCH v2 net-next 2/5] bpf/verifier: when pruning a branch, ignore its write marks

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Message-ID: <739a46ad-2f60-91dd-d34e-97828a749610@fb.com>
Date:   Wed, 23 Aug 2017 07:42:27 -0700
From:   Alexei Starovoitov <ast@...com>
To:     Edward Cree <ecree@...arflare.com>, <davem@...emloft.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>
CC:     <netdev@...r.kernel.org>,
        iovisor-dev <iovisor-dev@...ts.iovisor.org>
Subject: Re: [PATCH v2 net-next 2/5] bpf/verifier: when pruning a branch,
 ignore its write marks

On 8/23/17 7:10 AM, Edward Cree wrote:
> The fact that writes occurred in reaching the continuation state does
>  not screen off its reads from us, because we're not really its parent.
> So detect 'not really the parent' in do_propagate_liveness, and ignore
>  write marks in that case.
>
> Fixes: dc503a8ad984 ("bpf/verifier: track liveness for pruning")
> Signed-off-by: Edward Cree <ecree@...arflare.com>

Acked-by: Alexei Starovoitov <ast@...nel.org>