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[2001:8b0:7a5a:26ff:8514:d6ff:4254:5985]) by smtp.gmail.com with ESMTPSA id a9sm1804017wmb.30.2019.03.14.04.40.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Mar 2019 04:40:33 -0700 (PDT) From: Lorenz Bauer To: ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org, bpf@vger.kernel.org Cc: kafai@fb.com, theojulienne@github.com, Lorenz Bauer Subject: [PATCH v2 1/8] bpf: track references based on is_acquire_func Date: Thu, 14 Mar 2019 11:39:47 +0000 Message-Id: <20190314113954.10210-2-lmb@cloudflare.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190314113954.10210-1-lmb@cloudflare.com> References: <20190222095057.9442-1-lmb@cloudflare.com> <20190314113954.10210-1-lmb@cloudflare.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org So far, the verifier only acquires reference tracking state for RET_PTR_TO_SOCKET_OR_NULL. Instead of extending this for every new return type which desires these semantics, acquire reference tracking state iff the called helper is an acquire function. Signed-off-by: Lorenz Bauer --- kernel/bpf/verifier.c | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 7c80f7f8f331..a52e723c8e5d 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -3147,19 +3147,7 @@ static int check_helper_call(struct bpf_verifier_env *env, int func_id, int insn } else if (fn->ret_type == RET_PTR_TO_SOCKET_OR_NULL) { mark_reg_known_zero(env, regs, BPF_REG_0); regs[BPF_REG_0].type = PTR_TO_SOCKET_OR_NULL; - if (is_acquire_function(func_id)) { - int id = acquire_reference_state(env, insn_idx); - - if (id < 0) - return id; - /* For mark_ptr_or_null_reg() */ - regs[BPF_REG_0].id = id; - /* For release_reference() */ - regs[BPF_REG_0].ref_obj_id = id; - } else { - /* For mark_ptr_or_null_reg() */ - regs[BPF_REG_0].id = ++env->id_gen; - } + regs[BPF_REG_0].id = ++env->id_gen; } else if (fn->ret_type == RET_PTR_TO_TCP_SOCK_OR_NULL) { mark_reg_known_zero(env, regs, BPF_REG_0); regs[BPF_REG_0].type = PTR_TO_TCP_SOCK_OR_NULL; @@ -3170,9 +3158,19 @@ static int check_helper_call(struct bpf_verifier_env *env, int func_id, int insn return -EINVAL; } - if (is_ptr_cast_function(func_id)) + if (is_ptr_cast_function(func_id)) { /* For release_reference() */ regs[BPF_REG_0].ref_obj_id = meta.ref_obj_id; + } else if (is_acquire_function(func_id)) { + int id = acquire_reference_state(env, insn_idx); + + if (id < 0) + return id; + /* For mark_ptr_or_null_reg() */ + regs[BPF_REG_0].id = id; + /* For release_reference() */ + regs[BPF_REG_0].ref_obj_id = id; + } do_refine_retval_range(regs, fn->ret_type, func_id, &meta); -- 2.19.1