From: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>
To: "Daniel Trujillo" <datrujillo@nvidia.com>,
"Daniël Trujillo via B4 Relay"
<devnull+datrujillo.nvidia.com@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Kumar Kartikeya Dwivedi" <memxor@gmail.com>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"Jiri Olsa" <jolsa@kernel.org>,
"Emil Tsalapatis" <emil@etsalapatis.com>,
"Ihor Solodrai" <ihor.solodrai@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"Stanislav Fomichev" <sdf@fomichev.me>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@kernel.org>,
"Jakub Kicinski" <kuba@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>,
"Simon Horman" <horms@kernel.org>
Cc: "bpf@vger.kernel.org" <bpf@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH bpf] bpf: mask speculative out-of-bounds skb helper loads
Date: Sat, 14 Nov 2026 02:56:26 +0000 [thread overview]
Message-ID: <DMULGPH2RSTQ.19OTSZVNUXME4@gmail.com> (raw)
In-Reply-To: <PH7PR12MB879437C51235E3A3094EBCB9B27E2@PH7PR12MB8794.namprd12.prod.outlook.com>
On Fri, Nov 13, 2026 at 06:50 PM Daniel Trujillo <datrujillo@nvidia.com> wrote:
> With the instrumentation described in the commit message, the
> reproducer recovered the target bytes on the unpatched kernel. The same
> reproducer did not recover them on the patched kernel.
That instrumentation is a CLFLUSH added to the kernel in front of
the branch. Nobody runs such a kernel.
So it is theoretical.
Sorry, still wont-fix.
prev parent reply other threads:[~2026-11-14 2:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-13 20:15 [PATCH bpf] bpf: mask speculative out-of-bounds skb helper loads Daniël Trujillo via B4 Relay
2026-11-13 20:15 ` Daniël Trujillo
2026-11-13 20:46 ` bot+bpf-ci
2026-11-13 22:10 ` Daniel Trujillo
2026-11-13 23:50 ` Alexei Starovoitov
2026-11-14 2:50 ` Daniel Trujillo
2026-11-14 2:56 ` Alexei Starovoitov [this message]
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