From patchwork Tue Nov 30 11:44:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marco Elver X-Patchwork-Id: 12646957 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0E54C4332F for ; Tue, 30 Nov 2021 11:45:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241170AbhK3LtI (ORCPT ); Tue, 30 Nov 2021 06:49:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44968 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241027AbhK3Lss (ORCPT ); Tue, 30 Nov 2021 06:48:48 -0500 Received: from mail-wm1-x34a.google.com (mail-wm1-x34a.google.com [IPv6:2a00:1450:4864:20::34a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2520C06175C for ; Tue, 30 Nov 2021 03:45:28 -0800 (PST) Received: by mail-wm1-x34a.google.com with SMTP id n41-20020a05600c502900b003335ab97f41so12709579wmr.3 for ; Tue, 30 Nov 2021 03:45:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=UU4Lhk72EIyuCjy+G0t4z2bUBJwzL7HcimRlPhkjEC4=; b=Qf1SuGMOlmDvzKhIKei4tnzeifu697gt4+vPZmQcibFNX577BHwmnXZj/43waD1AFo zqqT6A3OzdKbGAxlzkO5UEoOJrj8Ib4JYt4r8NC8THoIspAyDexcoQ+HC59ZrCciIG6G Y0VXnkOleQAMCEJEzP4uOSbxFqMSuYOTS7PFKjrFz+hivg1sZFOLVTAGY8CqkDjW1GV+ a75BRnHn5LDO0YGeARpnpZlga5QclV3aHltFO/KTZgFV3VjrYcdVKBLFNx+MGXoTUU6/ B2ZT3iHpx6WJhoHbl+3frEAS8lAD2vpAMIDk1kiKMlouBt40xlrsSLBbihlNPqys44OP 0U5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=UU4Lhk72EIyuCjy+G0t4z2bUBJwzL7HcimRlPhkjEC4=; b=asAKfp44KmzPkZOVtsoXJ+Gv2+H6rZuJsFZBy77Og3gbhF7dsN9e+pQQaPe17RvJ1S aGtTzsdbj/mwdoDw5rmsaH9ZwDQ3TmNtHWX3SKTLlwL6+FOoipklqL/UesFexnRpAhmO cnGG+ultcUZB52oVQk3lEGrCel9BUKE9SoRpr++Rw7ZMz62A2XRkrZgKl8Yheyn4Ewcz wGEvqMu+6Jtsq0xZQ793E+9V+AllEP0vv/wd3MbJfVkmpNctjQhd2u79ty85D5wQUwJt x+VhMZbvLwKnrFeB8XbQvbEtG6Ljy4UuSNmusA0HxrOKhd5cASxOCpB8KaHu3+NUtkps d/xg== X-Gm-Message-State: AOAM532T7gR+dK3Yy1xahTEGWH1cVJvnTo5YmxUDO157Bt27DtT+Jkfu tuiQoBHqW05MTydQr79ZbyR6qArYvg== X-Google-Smtp-Source: ABdhPJxT/z2Am1c0zAK22jXUJmps1vWdH3CmrVGKav+XMyFhnnpTrHTyxg//BbOZE2TGj8a7z9k8PB/5QA== X-Received: from elver.muc.corp.google.com ([2a00:79e0:15:13:86b7:11e9:7797:99f0]) (user=elver job=sendgmr) by 2002:a05:600c:2252:: with SMTP id a18mr4415894wmm.133.1638272727443; Tue, 30 Nov 2021 03:45:27 -0800 (PST) Date: Tue, 30 Nov 2021 12:44:18 +0100 In-Reply-To: <20211130114433.2580590-1-elver@google.com> Message-Id: <20211130114433.2580590-11-elver@google.com> Mime-Version: 1.0 References: <20211130114433.2580590-1-elver@google.com> X-Mailer: git-send-email 2.34.0.rc2.393.gf8c9666880-goog Subject: [PATCH v3 10/25] kcsan: test: Match reordered or normal accesses From: Marco Elver To: elver@google.com, "Paul E. McKenney" Cc: Alexander Potapenko , Boqun Feng , Borislav Petkov , Dmitry Vyukov , Ingo Molnar , Mark Rutland , Peter Zijlstra , Thomas Gleixner , Waiman Long , Will Deacon , kasan-dev@googlegroups.com, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, x86@kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Due to reordering accesses with weak memory modeling, any access can now appear as "(reordered)". Match any permutation of accesses if CONFIG_KCSAN_WEAK_MEMORY=y, so that we effectively match an access if it is denoted "(reordered)" or not. Signed-off-by: Marco Elver --- kernel/kcsan/kcsan_test.c | 92 +++++++++++++++++++++++++++------------ 1 file changed, 63 insertions(+), 29 deletions(-) diff --git a/kernel/kcsan/kcsan_test.c b/kernel/kcsan/kcsan_test.c index 6e3c2b8bc608..ec054879201b 100644 --- a/kernel/kcsan/kcsan_test.c +++ b/kernel/kcsan/kcsan_test.c @@ -151,7 +151,7 @@ struct expect_report { /* Check observed report matches information in @r. */ __no_kcsan -static bool report_matches(const struct expect_report *r) +static bool __report_matches(const struct expect_report *r) { const bool is_assert = (r->access[0].type | r->access[1].type) & KCSAN_ACCESS_ASSERT; bool ret = false; @@ -253,6 +253,40 @@ static bool report_matches(const struct expect_report *r) return ret; } +static __always_inline const struct expect_report * +__report_set_scoped(struct expect_report *r, int accesses) +{ + BUILD_BUG_ON(accesses > 3); + + if (accesses & 1) + r->access[0].type |= KCSAN_ACCESS_SCOPED; + else + r->access[0].type &= ~KCSAN_ACCESS_SCOPED; + + if (accesses & 2) + r->access[1].type |= KCSAN_ACCESS_SCOPED; + else + r->access[1].type &= ~KCSAN_ACCESS_SCOPED; + + return r; +} + +__no_kcsan +static bool report_matches_any_reordered(struct expect_report *r) +{ + return __report_matches(__report_set_scoped(r, 0)) || + __report_matches(__report_set_scoped(r, 1)) || + __report_matches(__report_set_scoped(r, 2)) || + __report_matches(__report_set_scoped(r, 3)); +} + +#ifdef CONFIG_KCSAN_WEAK_MEMORY +/* Due to reordering accesses, any access may appear as "(reordered)". */ +#define report_matches report_matches_any_reordered +#else +#define report_matches __report_matches +#endif + /* ===== Test kernels ===== */ static long test_sink; @@ -438,13 +472,13 @@ static noinline void test_kernel_xor_1bit(void) __no_kcsan static void test_basic(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_write, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, { test_kernel_read, &test_var, sizeof(test_var), 0 }, }, }; - static const struct expect_report never = { + struct expect_report never = { .access = { { test_kernel_read, &test_var, sizeof(test_var), 0 }, { test_kernel_read, &test_var, sizeof(test_var), 0 }, @@ -469,14 +503,14 @@ static void test_basic(struct kunit *test) __no_kcsan static void test_concurrent_races(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { /* NULL will match any address. */ { test_kernel_rmw_array, NULL, 0, __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) }, { test_kernel_rmw_array, NULL, 0, __KCSAN_ACCESS_RW(0) }, }, }; - static const struct expect_report never = { + struct expect_report never = { .access = { { test_kernel_rmw_array, NULL, 0, 0 }, { test_kernel_rmw_array, NULL, 0, 0 }, @@ -498,13 +532,13 @@ static void test_concurrent_races(struct kunit *test) __no_kcsan static void test_novalue_change(struct kunit *test) { - const struct expect_report expect_rw = { + struct expect_report expect_rw = { .access = { { test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, { test_kernel_read, &test_var, sizeof(test_var), 0 }, }, }; - const struct expect_report expect_ww = { + struct expect_report expect_ww = { .access = { { test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, { test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, @@ -530,13 +564,13 @@ static void test_novalue_change(struct kunit *test) __no_kcsan static void test_novalue_change_exception(struct kunit *test) { - const struct expect_report expect_rw = { + struct expect_report expect_rw = { .access = { { test_kernel_write_nochange_rcu, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, { test_kernel_read, &test_var, sizeof(test_var), 0 }, }, }; - const struct expect_report expect_ww = { + struct expect_report expect_ww = { .access = { { test_kernel_write_nochange_rcu, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, { test_kernel_write_nochange_rcu, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, @@ -556,7 +590,7 @@ static void test_novalue_change_exception(struct kunit *test) __no_kcsan static void test_unknown_origin(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_read, &test_var, sizeof(test_var), 0 }, { NULL }, @@ -578,7 +612,7 @@ static void test_unknown_origin(struct kunit *test) __no_kcsan static void test_write_write_assume_atomic(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_write, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, { test_kernel_write, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, @@ -604,7 +638,7 @@ static void test_write_write_assume_atomic(struct kunit *test) __no_kcsan static void test_write_write_struct(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, { test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, @@ -626,7 +660,7 @@ static void test_write_write_struct(struct kunit *test) __no_kcsan static void test_write_write_struct_part(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, { test_kernel_write_struct_part, &test_struct.val[3], sizeof(test_struct.val[3]), KCSAN_ACCESS_WRITE }, @@ -658,7 +692,7 @@ static void test_read_atomic_write_atomic(struct kunit *test) __no_kcsan static void test_read_plain_atomic_write(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_read, &test_var, sizeof(test_var), 0 }, { test_kernel_write_atomic, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ATOMIC }, @@ -679,7 +713,7 @@ static void test_read_plain_atomic_write(struct kunit *test) __no_kcsan static void test_read_plain_atomic_rmw(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_read, &test_var, sizeof(test_var), 0 }, { test_kernel_atomic_rmw, &test_var, sizeof(test_var), @@ -701,13 +735,13 @@ static void test_read_plain_atomic_rmw(struct kunit *test) __no_kcsan static void test_zero_size_access(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, { test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, }, }; - const struct expect_report never = { + struct expect_report never = { .access = { { test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, { test_kernel_read_struct_zero_size, &test_struct.val[3], 0, 0 }, @@ -741,7 +775,7 @@ static void test_data_race(struct kunit *test) __no_kcsan static void test_assert_exclusive_writer(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_assert_writer, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, { test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, @@ -759,7 +793,7 @@ static void test_assert_exclusive_writer(struct kunit *test) __no_kcsan static void test_assert_exclusive_access(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_assert_access, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE }, { test_kernel_read, &test_var, sizeof(test_var), 0 }, @@ -777,19 +811,19 @@ static void test_assert_exclusive_access(struct kunit *test) __no_kcsan static void test_assert_exclusive_access_writer(struct kunit *test) { - const struct expect_report expect_access_writer = { + struct expect_report expect_access_writer = { .access = { { test_kernel_assert_access, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE }, { test_kernel_assert_writer, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, }, }; - const struct expect_report expect_access_access = { + struct expect_report expect_access_access = { .access = { { test_kernel_assert_access, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE }, { test_kernel_assert_access, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE }, }, }; - const struct expect_report never = { + struct expect_report never = { .access = { { test_kernel_assert_writer, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, { test_kernel_assert_writer, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, @@ -813,7 +847,7 @@ static void test_assert_exclusive_access_writer(struct kunit *test) __no_kcsan static void test_assert_exclusive_bits_change(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_assert_bits_change, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, { test_kernel_change_bits, &test_var, sizeof(test_var), @@ -844,13 +878,13 @@ static void test_assert_exclusive_bits_nochange(struct kunit *test) __no_kcsan static void test_assert_exclusive_writer_scoped(struct kunit *test) { - const struct expect_report expect_start = { + struct expect_report expect_start = { .access = { { test_kernel_assert_writer_scoped, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_SCOPED }, { test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, }, }; - const struct expect_report expect_inscope = { + struct expect_report expect_inscope = { .access = { { test_enter_scope, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_SCOPED }, { test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, @@ -871,16 +905,16 @@ static void test_assert_exclusive_writer_scoped(struct kunit *test) __no_kcsan static void test_assert_exclusive_access_scoped(struct kunit *test) { - const struct expect_report expect_start1 = { + struct expect_report expect_start1 = { .access = { { test_kernel_assert_access_scoped, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE | KCSAN_ACCESS_SCOPED }, { test_kernel_read, &test_var, sizeof(test_var), 0 }, }, }; - const struct expect_report expect_start2 = { + struct expect_report expect_start2 = { .access = { expect_start1.access[0], expect_start1.access[0] }, }; - const struct expect_report expect_inscope = { + struct expect_report expect_inscope = { .access = { { test_enter_scope, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE | KCSAN_ACCESS_SCOPED }, { test_kernel_read, &test_var, sizeof(test_var), 0 }, @@ -985,7 +1019,7 @@ static void test_atomic_builtins(struct kunit *test) __no_kcsan static void test_1bit_value_change(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_read, &test_var, sizeof(test_var), 0 }, { test_kernel_xor_1bit, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) },