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Mon, 21 Sep 2026 19:15:35 -0700 (PDT) Received: from localhost ([2a04:ee40:2228:a500:f8e2:3a74:69bf:2c6a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49fd8cc061fsm34968545e9.4.2026.09.21.19.15.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Sep 2026 19:15:34 -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: Tue, 22 Sep 2026 04:15:34 +0200 Message-Id: Cc: "Amery Hung" , "Emil Tsalapatis" , "Nicholas Carlini" , , , Subject: Re: [PATCH bpf-next v1 0/6] bpf: Scope callback arguments to their frame From: "Kumar Kartikeya Dwivedi" To: "Alexei Starovoitov" , "Ihor Solodrai" , "Andrii Nakryiko" , "Daniel Borkmann" , "Eduard Zingerman" X-Mailer: aerc 0.22.0 References: <20260922010333.1226537-1-ihor.solodrai@linux.dev> In-Reply-To: On Tue Sep 22, 2026 at 3:55 AM CEST, Alexei Starovoitov wrote: > On Mon, Sep 21, 2026 at 06:03 PM Ihor Solodrai = wrote: > >> Neither has a local fix: both arguments point into a helper's own >> frame, with nothing longer-lived to anchor them to. > > It's the same problem as a pointer to callee's stack. > check_stack_write_fixed_off() deals with it like this: > if (state !=3D cur && reg->type =3D=3D PTR_TO_STACK) { > verbose(env, "cannot spill pointers to stack into stack frame o= f the caller\n"); > return -EINVAL; > } > CONST_PTR_TO_DYNPTR wasn't spillable before 7.3, so nothing depends > on parking it in the caller's frame. Reject it there too ? > and then no need for REF_TYPE_FRAME complexity? +1, will be much simpler fix.