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[192.26.29.3]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c24591df465sm77222066b.48.2026.08.20.07.32.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Aug 2026 07:32:35 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Thu, 20 Aug 2026 16:32:34 +0200 Message-Id: Cc: "Andrii Nakryiko" , "Eduard Zingerman" , "John Fastabend" , , "David Vernet" , "Andrea Righi" , "Changwoo Min" , "Emil Tsalapatis" , , Subject: Re: [PATCH bpf-next] bpf: sched_ext: Mark ops argument container pointer fields as trusted From: "Kumar Kartikeya Dwivedi" To: "Tejun Heo" , "Alexei Starovoitov" , "Daniel Borkmann" X-Mailer: aerc 0.21.0 References: <95d7ccc17681aa3a4a2eeb1b073f00f7@kernel.org> In-Reply-To: <95d7ccc17681aa3a4a2eeb1b073f00f7@kernel.org> On Thu Aug 20, 2026 at 7:20 AM CEST, Tejun Heo wrote: > Walking an unannotated pointer field of a trusted struct yields a bare > PTR_TO_BTF_ID in non-sleepable programs, which kfuncs and helpers accept, > but PTR_UNTRUSTED in sleepable programs, which they reject. This gets in = the > way of making ops.init_task() sleepable, which schedulers want for > allocations. For example, passing args->cgroup into bpf_cgrp_storage_get(= ) > then fails verification and the only recourse is round-tripping through t= he > cgroup ID with bpf_cgroup_from_id(). > > The pointer fields in the sched_ext ops argument containers are all pinne= d > by the callers for the duration of the ops calls and are never NULL. Add > them to the verifier's trusted-fields whitelist so that they are PTR_TRUS= TED > in both sleepable and non-sleepable programs. > > Signed-off-by: Tejun Heo > --- Acked-by: Kumar Kartikeya Dwivedi I (or others) will add Fixes tag when applying, no need to respin. > [...]