From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE078C43381 for ; Tue, 19 Mar 2019 10:21:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BDF6B20828 for ; Tue, 19 Mar 2019 10:21:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=cloudflare.com header.i=@cloudflare.com header.b="f8uNzOG0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727443AbfCSKVi (ORCPT ); Tue, 19 Mar 2019 06:21:38 -0400 Received: from mail-wm1-f48.google.com ([209.85.128.48]:38108 "EHLO mail-wm1-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727402AbfCSKVg (ORCPT ); Tue, 19 Mar 2019 06:21:36 -0400 Received: by mail-wm1-f48.google.com with SMTP id a188so15771945wmf.3 for ; Tue, 19 Mar 2019 03:21:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=oxEbRfduSc+AGv0GejYc8Zor9ObdlMKkIW/U80dwh2k=; b=f8uNzOG0bje/2lA+at3/fZ1E6jJOvQ+V6I+a29mJxcNRAS6b+ZzS0OK6Lu+Q3iK9Wr QdT7tJyG9q2CmwatRRmq0nDMnb1lpaRhmUnRI5QWmaxcsJozNqAlZ7uwSuKqKT/dBzon SQaveWwLDYnuqU4fMmTcBSOgIEx+cUF8iTAeM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=oxEbRfduSc+AGv0GejYc8Zor9ObdlMKkIW/U80dwh2k=; b=kdZ3ykuYopCZU9loyqJKEFtU2SP6GDFFg462hLnVtmFOCgAMRAvtecrMthZMzDYIeO B62bNCUUMfa8jQCswAmfwQVxCf36s2+6UuKoRgX4JBNp5KhPb18bGY5KYbYKecGtMI33 6j4XMHjX5APrnNDSmd94M9AT8bEe3VsrdCKq1KbF1XWD2YQ3xT3f/ARCyE0CC7CLR1Rp RdxH13Brnb4DaD83YP/5bnFg8+K7eDdGUHqUjZAIfXI6Bl5Y7axdRtYjM7/q2UfWHdMx mJno2eIEdxCUC55+nRtQL/SpJei1ijcOk2ZKOMcYwXqnyl1dIopYZ9NrMOuT3v8ZRupC cHwA== X-Gm-Message-State: APjAAAWdh0JhIAVF8kuZOVlkdceZSvS4TTQ3XJk3pAiVPYpkpnYi84tA 3p95hFVPLzf/oj2pRd7UDXX7lQ== X-Google-Smtp-Source: APXvYqyBG5yQm3DWVT/F2LuAqmcocDDnRU3SC221zmRabV7F61YiEwPaUjqPFgxc5N0b4Pc3R/mvsA== X-Received: by 2002:a1c:f102:: with SMTP id p2mr3003073wmh.36.1552990894751; Tue, 19 Mar 2019 03:21:34 -0700 (PDT) Received: from localhost.localdomain ([217.138.62.245]) by smtp.gmail.com with ESMTPSA id q2sm27895781wrd.46.2019.03.19.03.21.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Mar 2019 03:21:34 -0700 (PDT) From: Lorenz Bauer To: ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org, bpf@vger.kernel.org Cc: kafai@fb.com, Lorenz Bauer Subject: [PATCH v2 7/8] selftests/bpf: test references to sock_common Date: Tue, 19 Mar 2019 10:21:02 +0000 Message-Id: <20190319102103.7380-8-lmb@cloudflare.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190319102103.7380-1-lmb@cloudflare.com> References: <20190222095057.9442-1-lmb@cloudflare.com> <20190319102103.7380-1-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 Make sure that returning a struct sock_common * reference invokes the reference tracking machinery in the verifier. Signed-off-by: Lorenz Bauer --- .../selftests/bpf/verifier/ref_tracking.c | 48 +++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/tools/testing/selftests/bpf/verifier/ref_tracking.c b/tools/testing/selftests/bpf/verifier/ref_tracking.c index a6905e5017dc..ebcbf154c460 100644 --- a/tools/testing/selftests/bpf/verifier/ref_tracking.c +++ b/tools/testing/selftests/bpf/verifier/ref_tracking.c @@ -9,6 +9,17 @@ .errstr = "Unreleased reference", .result = REJECT, }, +{ + "reference tracking: leak potential reference to sock_common", + .insns = { + BPF_SK_LOOKUP(skc_lookup_tcp), + BPF_MOV64_REG(BPF_REG_6, BPF_REG_0), /* leak reference */ + BPF_EXIT_INSN(), + }, + .prog_type = BPF_PROG_TYPE_SCHED_CLS, + .errstr = "Unreleased reference", + .result = REJECT, +}, { "reference tracking: leak potential reference on stack", .insns = { @@ -49,6 +60,17 @@ .errstr = "Unreleased reference", .result = REJECT, }, +{ + "reference tracking: zero potential reference to sock_common", + .insns = { + BPF_SK_LOOKUP(skc_lookup_tcp), + BPF_MOV64_IMM(BPF_REG_0, 0), /* leak reference */ + BPF_EXIT_INSN(), + }, + .prog_type = BPF_PROG_TYPE_SCHED_CLS, + .errstr = "Unreleased reference", + .result = REJECT, +}, { "reference tracking: copy and zero potential references", .insns = { @@ -76,6 +98,20 @@ .errstr = "type=sock_or_null expected=sock", .result = REJECT, }, +{ + "reference tracking: release reference to sock_common without check", + .insns = { + BPF_SK_LOOKUP(skc_lookup_tcp), + /* reference in r0 may be NULL */ + BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), + BPF_MOV64_IMM(BPF_REG_2, 0), + BPF_EMIT_CALL(BPF_FUNC_sk_release), + BPF_EXIT_INSN(), + }, + .prog_type = BPF_PROG_TYPE_SCHED_CLS, + .errstr = "type=sock_common_or_null expected=sock", + .result = REJECT, +}, { "reference tracking: release reference", .insns = { @@ -88,6 +124,18 @@ .prog_type = BPF_PROG_TYPE_SCHED_CLS, .result = ACCEPT, }, +{ + "reference tracking: release reference to sock_common", + .insns = { + BPF_SK_LOOKUP(skc_lookup_tcp), + BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), + BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1), + BPF_EMIT_CALL(BPF_FUNC_sk_release), + BPF_EXIT_INSN(), + }, + .prog_type = BPF_PROG_TYPE_SCHED_CLS, + .result = ACCEPT, +}, { "reference tracking: release reference 2", .insns = { -- 2.19.1