linux-kernel - Re: [PATCH bpf] bpf, x64: fix stack layout of JITed bpf code

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Date:   Sat, 15 Jun 2019 14:46:03 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf] bpf, x64: fix stack layout of JITed bpf code

On Fri, Jun 14, 2019 at 4:10 PM Alexei Starovoitov <ast@...nel.org> wrote:
>
> Since commit 177366bf7ceb the %rbp stopped pointing to %rbp of the
> previous stack frame. That broke frame pointer based stack unwinding.
> This commit is a partial revert of it.
> Note that the location of tail_call_cnt is fixed, since the verifier
> enforces MAX_BPF_STACK stack size for programs with tail calls.
>
> Fixes: 177366bf7ceb ("bpf: change x86 JITed program stack layout")
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

Applied to bpf tree.