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Mon, 10 Aug 2026 12:35:05 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf-next 1/2] bpf: Compare iterator types during state pruning From: Eduard Zingerman To: Ning Ding , bpf@vger.kernel.org Cc: memxor@gmail.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, shuah@kernel.org Date: Mon, 10 Aug 2026 12:35:02 -0700 In-Reply-To: <20260807004320.134069-2-dingning04@gmail.com> References: <20260807004320.134069-1-dingning04@gmail.com> <20260807004320.134069-2-dingning04@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-10 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2026-08-06 at 17:43 -0700, Ning Ding wrote: > An iterator stack slot can be MEM_RCU or PTR_UNTRUSTED. These states > must not be equal, or the verifier can prune an unsafe path. >=20 > Compare the pointer type for STACK_ITER slots. >=20 > Fixes: dfab99df147b ("bpf: teach the verifier to enforce css_iter and tas= k_iter in RCU CS") > Signed-off-by: Ning Ding > --- Acked-by: Eduard Zingerman ...