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[198.162.52.65]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cbed8bb9569sm163683a12.3.2026.08.10.21.01.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Aug 2026 21:01:51 -0700 (PDT) From: Ning Ding To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Shuah Khan , Ning Ding , Chuyi Zhou , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next v2 0/2] bpf: Compare iterator types during state pruning Date: Mon, 10 Aug 2026 20:59:53 -0700 Message-ID: <20260811035955.132989-1-dingning04@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Iterator stack slots can be marked MEM_RCU or PTR_UNTRUSTED. The STACK_ITER check in stacksafe() does not compare this type, so state pruning can treat these states as equal and prune an unsafe path. Compare the type and add a test where RCU protection has a gap. --- Changes in v2: - Convert the regression test to inline assembly so its verifier-sensitive control-flow layout is stable. - Add Eduard Zingerman's Acked-by tag to patch 1. v1: https://lore.kernel.org/bpf/20260807004320.134069-1-dingning04@gmail.com/ Ning Ding (2): bpf: Compare iterator types during state pruning selftests/bpf: Test RCU iterator state pruning kernel/bpf/states.c | 3 +- .../selftests/bpf/progs/iters_task_failure.c | 46 +++++++++++++++++++ 2 files changed, 48 insertions(+), 1 deletion(-) -- 2.43.0