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Fri, 04 Sep 2026 17:06:12 -0700 (PDT) Received: from ezingerman-fedora-PF4V722J.thefacebook.com ([2620:10d:c090:500::5:4f3d]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3356dc5c04dsm42277eec.8.2026.09.04.17.06.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Sep 2026 17:06:12 -0700 (PDT) From: Eduard Zingerman To: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org Cc: daniel@iogearbox.net, martin.lau@linux.dev, kernel-team@fb.com, yonghong.song@linux.dev, eddyz87@gmail.com, memxor@gmail.com Subject: [PATCH bpf 00/10] bpf: add missing precision propagation after bpf_register_is_null calls Date: Fri, 4 Sep 2026 17:05:51 -0700 Message-ID: <20260904-register-is-null-precise-fixes-v1-0-0f5a360ff15d@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Change-ID: 20260904-register-is-null-precise-fixes-15c7f8cd7a73 Content-Transfer-Encoding: 8bit Fix [1] uncovered a host of locations where the call to bpf_register_is_null() is not followed by a call to bpf_mark_chain_precision(). check_map_kptr_access() is omitted as it is handled [2] by another series. [1] https://lore.kernel.org/bpf/20260904083325.2083493-7-eddyz87@gmail.com/ [2] https://lore.kernel.org/bpf/20260904104203.345917-6-memxor@gmail.com/ --- Eduard Zingerman (10): bpf: mark a NULL call argument precise selftests/bpf: precision of a NULL helper argument bpf: mark a NULL memory argument of a call precise selftests/bpf: precision of a NULL global subprogram memory argument bpf: mark a NULL kfunc argument precise selftests/bpf: precision of a NULL kfunc argument bpf: mark a NULL BTF_ID argument of a global subprogram precise selftests/bpf: precision of a NULL global subprogram BTF_ID argument bpf: propagate mark_chain_precision() errors out of loop_flag_is_zero() bpf: use mark_arg_precision() in check_mem_size_reg() kernel/bpf/verifier.c | 78 +++++++++++----- .../selftests/bpf/progs/verifier_cgroup_storage.c | 29 ++++++ .../selftests/bpf/progs/verifier_global_ptr_args.c | 24 +++++ .../selftests/bpf/progs/verifier_precision.c | 100 +++++++++++++++++++++ .../bpf/progs/verifier_subprog_precision.c | 12 +-- 5 files changed, 214 insertions(+), 29 deletions(-) --- base-commit: 41e6f03658adfa9df68642750b53a046f1abdea9 change-id: 20260904-register-is-null-precise-fixes-15c7f8cd7a73