netdev - Re: [PATCH net] bpf: fix bpf_tail

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Message-ID: <1507070918.8061.34.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Tue, 03 Oct 2017 15:48:38 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Alexei Starovoitov <ast@...com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH net] bpf: fix bpf_tail_call() x64 JIT

On Tue, 2017-10-03 at 15:37 -0700, Alexei Starovoitov wrote:
> - bpf prog_array just like all other types of bpf array accepts 32-bit index.
>   Clarify that in the comment.
> - fix x64 JIT of bpf_tail_call which was incorrectly loading 8 instead of 4 bytes
> - tighten corresponding check in the interpreter to stay consistent
> 
> The JIT bug can be triggered after introduction of BPF_F_NUMA_NODE flag
> in commit 96eabe7a40aa in 4.14. Before that the map_flags would stay zero and
> though JIT code is wrong it will check bounds correctly.
> Hence two fixes tags. All other JITs don't have this problem.
> 
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>
> Fixes: 96eabe7a40aa ("bpf: Allow selecting numa node during map creation")
> Fixes: b52f00e6a715 ("x86: bpf_jit: implement bpf_tail_call() helper")
> Acked-by: Daniel Borkmann <daniel@...earbox.net>
> Acked-by: Martin KaFai Lau <kafai@...com>
> ---
> Backport to stable would be nice, but not strictly necessary.

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks !