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Mon, 21 Sep 2026 18:55:06 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Tue, 22 Sep 2026 01:55:06 +0000 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: "Alexei Starovoitov" To: "Ihor Solodrai" , "Andrii Nakryiko" , "Daniel Borkmann" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" In-Reply-To: <20260922010333.1226537-1-ihor.solodrai@linux.dev> References: <20260922010333.1226537-1-ihor.solodrai@linux.dev> X-Mailer: mkdraft (claude review draft; edit before sending) Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 != cur && reg->type == PTR_TO_STACK) { verbose(env, "cannot spill pointers to stack into stack frame of 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?