From: Ilias Apalodimas <ilias.apalodimas@linaro.org>
To: Xi Wang <xi.wang@gmail.com>
Cc: Song Liu <songliubraving@fb.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Alexei Starovoitov <ast@kernel.org>,
Will Deacon <will@kernel.org>,
ardb@kernel.org, Jean-Philippe Brucker <jean-philippe@linaro.org>,
Anders Roxell <anders.roxell@linaro.org>,
Daniel Borkmann <daniel@iogearbox.net>,
naresh.kamboju@linaro.org,
John Fastabend <john.fastabend@gmail.com>,
Zi Shen Lim <zlim.lnx@gmail.com>,
Jakub Kicinski <kuba@kernel.org>,
Andrii Nakryiko <andriin@fb.com>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Jesper Dangaard Brouer <brouer@redhat.com>,
Yonghong Song <yhs@fb.com>, KP Singh <kpsingh@chromium.org>,
linux-arm-kernel@lists.infradead.org,
Yauheni Kaliuta <yauheni.kaliuta@redhat.com>,
netdev@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
bpf@vger.kernel.org, Martin KaFai Lau <kafai@fb.com>
Subject: Re: [PATCH] arm64: bpf: Fix branch offset in JIT
Date: Mon, 14 Sep 2020 20:55:16 +0300 [thread overview]
Message-ID: <20200914175516.GA21832@apalos.home> (raw)
In-Reply-To: <CAKU6vyaxnzWVA=MPAuDwtu4UOTWS6s0cZOYQKVhQg5Mue7Wbww@mail.gmail.com>
On Mon, Sep 14, 2020 at 10:47:33AM -0700, Xi Wang wrote:
> On Mon, Sep 14, 2020 at 10:03 AM Ilias Apalodimas
> <ilias.apalodimas@linaro.org> wrote:
> > Naresh from Linaro reported it during his tests on 5.8-rc1 as well [1].
> > I've included both Jiri and him on the v2 as reporters.
> >
> > [1] https://lkml.org/lkml/2020/8/11/58
>
> I'm curious what you think of Luke's earlier patch to this bug:
We've briefly discussed this approach with Yauheni while coming up with the
posted patch.
I think that contructing the array correctly in the first place is better.
Right now it might only be used in bpf2a64_offset() and bpf_prog_fill_jited_linfo()
but if we fixup the values on the fly in there, everyone that intends to use the
offset for any reason will have to account for the missing instruction.
Cheers
/Ilias
>
> https://lore.kernel.org/bpf/CANoWswkaj1HysW3BxBMG9_nd48fm0MxM5egdtmHU6YsEc_GUtQ@mail.gmail.com/T/#m4335b4005da0d60059ba96920fcaaecf2637042a
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next prev parent reply other threads:[~2020-09-14 17:56 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-14 8:36 [PATCH] arm64: bpf: Fix branch offset in JIT Ilias Apalodimas
2020-09-14 12:20 ` Will Deacon
2020-09-14 12:35 ` Ilias Apalodimas
2020-09-14 13:23 ` Ilias Apalodimas
2020-09-14 14:01 ` Will Deacon
2020-09-14 16:02 ` Ilias Apalodimas
2020-09-14 16:12 ` Jesper Dangaard Brouer
2020-09-14 17:02 ` Ilias Apalodimas
2020-09-14 17:47 ` Xi Wang
2020-09-14 17:55 ` Ilias Apalodimas [this message]
2020-09-14 18:08 ` Xi Wang
2020-09-14 18:21 ` Luke Nelson
2020-09-14 18:36 ` Ilias Apalodimas
2020-09-14 18:27 ` Ilias Apalodimas
2020-09-14 18:52 ` Xi Wang
2020-09-14 19:24 ` Ilias Apalodimas
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