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Thu, 24 Sep 2026 00:02:42 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf-next v1 0/6] bpf: Scope callback arguments to their frame From: Eduard Zingerman To: Andrii Nakryiko , Ihor Solodrai Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Kumar Kartikeya Dwivedi , Amery Hung , Emil Tsalapatis , Nicholas Carlini , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Date: Thu, 24 Sep 2026 00:02:39 -0700 In-Reply-To: References: <20260922010333.1226537-1-ihor.solodrai@linux.dev> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.2 (3.60.2-2.fc44) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-09-22 at 15:41 -0700, Andrii Nakryiko wrote: ... > It does seem like we miss a reference representing single frame > lifetime which we can then use as a parent for all things that > shouldn't survive past the current frame. There is a separate fix > right now to invalidate dynptr created in subprog's frame. Seems like > that one should be expressible the same way: local dynptr's parent is > "frame lifetime" reference. >=20 > We can even relax this "cannot spill pointers to stack into stack > frame of the caller" error, potentially, by just turning that > PTR_TO_STACK into SCALAR at exit from current frame and let program > verification go, no harm. >=20 > So for me it seems like a necessary and useful addition. I shared some feedback about unnecessary bit mask manipulation with Ihor off list, but overall I think that this series makes sense.