linux-kernel - Re: [PATCH bpf-next v3 00/11] bpf: Mitigate Spectre v1 using barriers

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Message-ID: <CAADnVQJ+=Tip0ocob2aWe4G0BTs4F7veMtM-DD7f-zGKncAa_g@mail.gmail.com>
Date: Fri, 9 May 2025 11:43:00 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: patchwork-bot+netdevbpf@...nel.org
Cc: Luis Gerhorst <luis.gerhorst@....de>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, 
	Martin KaFai Lau <martin.lau@...ux.dev>, Eduard <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Puranjay Mohan <puranjay@...nel.org>, 
	Xu Kuohai <xukuohai@...weicloud.com>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, Hari Bathini <hbathini@...ux.ibm.com>, 
	Christophe Leroy <christophe.leroy@...roup.eu>, "Naveen N. Rao" <naveen@...nel.org>, 
	Madhavan Srinivasan <maddy@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>, 
	Nicholas Piggin <npiggin@...il.com>, Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, 
	Henriette Herzog <henriette.herzog@....de>, Saket Kumar Bhaskar <skb99@...ux.ibm.com>, 
	Cupertino Miranda <cupertino.miranda@...cle.com>, Jiayuan Chen <mrpre@....com>, 
	Matan Shachnai <m.shachnai@...il.com>, Dimitar Kanaliev <dimitar.kanaliev@...eground.com>, 
	Shung-Hsi Yu <shung-hsi.yu@...e.com>, Daniel Xu <dxu@...uu.xyz>, bpf <bpf@...r.kernel.org>, 
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>, 
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 00/11] bpf: Mitigate Spectre v1 using barriers

On Fri, May 9, 2025 at 11:39 AM <patchwork-bot+netdevbpf@...nel.org> wrote:
>
> Hello:
>
> This series was applied to bpf/bpf-next.git (master)
> by Alexei Starovoitov <ast@...nel.org>:
>
> On Thu,  1 May 2025 09:35:51 +0200 you wrote:
> > This improves the expressiveness of unprivileged BPF by inserting
> > speculation barriers instead of rejecting the programs.
> >
> > The approach was previously presented at LPC'24 [1] and RAID'24 [2].
> >
> > To mitigate the Spectre v1 (PHT) vulnerability, the kernel rejects
> > potentially-dangerous unprivileged BPF programs as of
> > commit 9183671af6db ("bpf: Fix leakage under speculation on mispredicted
> > branches"). In [2], we have analyzed 364 object files from open source
> > projects (Linux Samples and Selftests, BCC, Loxilb, Cilium, libbpf
> > Examples, Parca, and Prevail) and found that this affects 31% to 54% of
> > programs.
> >
> > [...]
>
> Here is the summary with links:
>   - [bpf-next,v3,01/11] selftests/bpf: Fix caps for __xlated/jited_unpriv
>     https://git.kernel.org/bpf/bpf-next/c/cf15cdc0f0f3
>   - [bpf-next,v3,02/11] bpf: Move insn if/else into do_check_insn()
>     (no matching commit)

Applied the first patch only.
Waiting for respin of the rest.