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Mon, 02 Nov 2026 04:37:07 -0800 (PST) Received: from [127.0.1.1] ([23.254.208.9]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a428c17bdsm36326095eec.6.2026.11.02.04.37.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2026 04:37:07 -0800 (PST) From: Qiliang Yuan Subject: [PATCH bpf-next 0/5] bpf: Fix three bugs around constant blinding and nop removal Date: Mon, 02 Nov 2026 07:37:00 -0500 Message-Id: <20261102-bpf-blind-nops-fixes-v1-0-844300e42cdb@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAOyD6GoC/x3LQQqDMBBG4avIrB0wobHoVYqLan51oIwhU4og3 r3R5ePxHWTIAqO+OijjJyablnB1RdP61gUssTT5xrfONZ7HNPP4EY2sWzKeZYcxHgGdi22YnoE KTRn3KPJFl1DsXxrO8w9Md1K1cAAAAA== To: Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Luis Gerhorst , Henriette Herzog , Anton Protopopov , Xu Kuohai , Hengqi Chen , Shuah Khan Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Qiliang Yuan , stable@vger.kernel.org X-Mailer: b4 0.13.0 Alexei listed three bugs that were in the tree before the patch list series [1]. Each patch fixes one, the last two add tests: bug fix test line info stays blinded when the JIT falls back 1 - removing a nospec jump as a nop drops its barrier 2 4 log_true_size misses an error from blinding 3 5 Patch 1 needs a JIT failure behind blinding with CONFIG_BPF_JIT_ALWAYS_ON=n, which a selftest can't cause, so its log shows a run with fail-nth instead. Each bug shows up on bpf-next and is gone with its fix. test_verifier and test_progs show no new failures. [1] https://lore.kernel.org/bpf/DMKHZS5B5CNO.186F6YH1T6YU4@gmail.com/ Signed-off-by: Qiliang Yuan --- Qiliang Yuan (5): bpf: Put the line info back when the JIT falls back after blinding bpf: Keep the barrier of a nospec insn when removing nops bpf: Finalize the verifier log after the runtime is selected selftests/bpf: Cover a nospec jump that becomes a nop selftests/bpf: Test log_true_size with an error from blinding include/linux/bpf.h | 6 +++ kernel/bpf/core.c | 29 ++++++++++- kernel/bpf/fixups.c | 3 +- kernel/bpf/verifier.c | 13 +++-- .../selftests/bpf/prog_tests/blinding_log.c | 59 ++++++++++++++++++++++ .../testing/selftests/bpf/progs/verifier_unpriv.c | 35 +++++++++++++ 6 files changed, 138 insertions(+), 7 deletions(-) --- base-commit: cd5bc55288d4fd999595c8f2af6a5408cbe92a52 change-id: 20261102-bpf-blind-nops-fixes-e45e91d65c75 Best regards, -- Qiliang Yuan