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[198.162.52.65]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84f45bc5696sm139516b3a.53.2026.08.05.16.41.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Aug 2026 16:41:09 -0700 (PDT) From: Ning Ding To: bpf@vger.kernel.org Cc: memxor@gmail.com, puranjay@kernel.org, paulmck@kernel.org, Ning Ding Subject: [PATCH bpf-next 0/2] bpf: Track overlapping RCU protection Date: Wed, 5 Aug 2026 16:39:32 -0700 Message-ID: <20260805233940.3966981-1-dingning04@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Preemption-disabled and IRQ-disabled regions provide RCU protection, but the verifier does not account for them. Current implementation can invalidate a task kptr while another RCU source remains active, or keep it valid after the final source ends. Track these regions and invalidate RCU-protected pointers only after the last protection ends. Add task kptr tests for overlapping protection and final-exit rejection. This follows review of the applied spin-unlock fix series [1]. Tested in QEMU/KVM: ./test_progs -t task_kfunc ./test_progs -t preempt_lock ./test_progs -t irq [1] https://lore.kernel.org/r/20260803112615.3362122-1-dingning04@gmail.com Ning Ding (2): bpf: Account for preempt and IRQ state in RCU protection selftests/bpf: Test overlapping RCU protection kernel/bpf/verifier.c | 13 +- .../selftests/bpf/prog_tests/task_kfunc.c | 6 + .../selftests/bpf/progs/task_kfunc_common.h | 2 + .../selftests/bpf/progs/task_kfunc_failure.c | 49 ++++++ .../selftests/bpf/progs/task_kfunc_success.c | 147 ++++++++++++++++++ 5 files changed, 214 insertions(+), 3 deletions(-) base-commit: 11c1e836710dcba03e50454a4eedfdbaf8d3050e -- 2.43.0