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Sun, 20 Sep 2026 10:06:41 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Sun, 20 Sep 2026 17:06:40 +0000 Message-Id: Cc: , , , , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , "Peter Oskolkov" , "Xiang Mei" , Subject: Re: [PATCH v3 1/3] bpf: propagate cb_access from freplace programs From: "Alexei Starovoitov" To: "Weiming Shi" , "Daniel Borkmann" , "John Fastabend" , "Andrii Nakryiko" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" , "Martin KaFai Lau" , "Song Liu" , "Yonghong Song" , "Jiri Olsa" , "Emil Tsalapatis" , "Ihor Solodrai" , "David S . Miller" , "Eric Dumazet" , "Jakub Kicinski" , "Paolo Abeni" , "Simon Horman" , "Shuah Khan" In-Reply-To: <20260920163211.795547-2-bestswngs@gmail.com> References: <20260920163211.795547-1-bestswngs@gmail.com> <20260920163211.795547-2-bestswngs@gmail.com> X-Mailer: mkdraft (claude review draft; edit before sending) Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, Sep 21, 2026 at 12:32 AM Weiming Shi wrote: > Cc: stable@vger.kernel.org > Fixes: be8704ff07d2 ("bpf: Introduce dynamic program extensions") That shouldn't go to stable. Loading an EXT prog takes CAP_BPF + CAP_NET_ADMIN + CAP_PERFMON. [...] > + if (prog->type == BPF_PROG_TYPE_EXT && READ_ONCE(prog->cb_access)) { > + WRITE_ONCE(tgt_prog->cb_access, true); > + /* Drain runs that observed cb_access=false before enabling freplace. */ > + synchronize_rcu(); > + } tc doesn't look at cb_access at all, yet every tc freplace that touches cb[] now waits for an RCU grace period in attach. This is a separate issue from the LWT one. Patch 2 resets the cb after the run whether the prog has cb_access or not, so it doesn't depend on this patch. Pls drop it from this series.