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Tue, 15 Sep 2026 00:51:23 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf v3 0/2] Fix global subprog verification context From: Eduard Zingerman To: Kumar Kartikeya Dwivedi , bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Emil Tsalapatis , Nicholas Carlini , kkd@meta.com, kernel-team@meta.com Date: Tue, 15 Sep 2026 00:51:20 -0700 In-Reply-To: References: <20260914131923.2544250-1-memxor@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-10+b1 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2026-09-14 at 15:27 +0200, Kumar Kartikeya Dwivedi wrote: > On Mon Sep 14, 2026 at 3:19 PM CEST, Kumar Kartikeya Dwivedi wrote: > > Global subprogs can be invoked in both sleepable and non-sleepable > > contexts, but are verified based on context assumptions for the program > > type as a whole and not the precise context in which they are invoked. > > Nicholas identified that this can violate verifier safety assumptions. > > Verify global subprogs once for each observed sleepability context and = add > > workqueue callback regression tests. > >=20 >=20 > By mistake, I tagged bpf tree for this one, sorry. I can respin again aft= er a > round of feedback or let someone else decide to apply it to either tree, = if this > version is landable. It applies and builds cleanly, I'd just land it in bpf.