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([2620:10d:c090:500::4:1637]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-292471d5bf5sm90303815ad.67.2025.10.20.16.08.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Oct 2025 16:08:36 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf-next v3 06/10] bpf: add plumbing for file-backed dynptr From: Eduard Zingerman To: Mykyta Yatsenko , bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, kafai@meta.com, kernel-team@meta.com, memxor@gmail.com Cc: Mykyta Yatsenko Date: Mon, 20 Oct 2025 16:08:35 -0700 In-Reply-To: <20251020222538.932915-7-mykyta.yatsenko5@gmail.com> References: <20251020222538.932915-1-mykyta.yatsenko5@gmail.com> <20251020222538.932915-7-mykyta.yatsenko5@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2025-10-20 at 23:25 +0100, Mykyta Yatsenko wrote: > From: Mykyta Yatsenko >=20 > Add the necessary verifier plumbing for the new file-backed dynptr type. > Introduce two kfuncs for its lifecycle management: > * bpf_dynptr_from_file() for initialization > * bpf_dynptr_file_discard() for destruction >=20 > Currently there is no mechanism for kfunc to release dynptr, this patch > add one: > * Dynptr release function sets meta->release_regno > * Call unmark_stack_slots_dynptr() if meta->release_regno is set and > dynptr ref_obj_id is set as well. >=20 > Signed-off-by: Mykyta Yatsenko > --- Acked-by: Eduard Zingerman