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Mon, 28 Sep 2026 00:48:35 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Mon, 28 Sep 2026 07:48:35 +0000 Message-Id: Cc: , , , , , , , , , , , Subject: Re: [PATCH bpf-next v2] bpf: Fix bpf_loop() depth check to use 32-bit max for nr_loops From: "Alexei Starovoitov" To: =?utf-8?q?=C3=96mer_Mete_Kaya?= , In-Reply-To: <20260928001609.429840-1-omermetekaya0@gmail.com> References: <20260928001609.429840-1-omermetekaya0@gmail.com> 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 28, 2026 at 03:15 AM Ömer Mete Kaya wrote: > The verifier compares callback_depth (u32) against reg_umax(), which > returns the 64-bit upper bound of R1. If the upper 32 bits of R1 are > set, reg_umax() can be U64_MAX, causing the depth check to be > ineffective and triggering excessive push_callback_call() invocations > until the complexity limit is hit. > > Use reg_u32_max() instead. The change is sound for both runtime paths: It's not a fix. Nothing is broken. pls stop the spam. pw-bot: cr