From patchwork Thu Feb 29 17:04:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= X-Patchwork-Id: 13577462 Received: from smtp-8fab.mail.infomaniak.ch (smtp-8fab.mail.infomaniak.ch [83.166.143.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AA3BB7A13A for ; Thu, 29 Feb 2024 17:04:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=83.166.143.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709226283; cv=none; b=sW0T2+U1rhqFSihg1j/0CyUKmNTtW/nE+D2Jgzf1WzeJ3OE8X1rCVq9L70lg0/qu0i/eHYz6OQzC3GczJhjlKCZDGuMWa1emqTyjZACnCHIkMDNtiXNBChFryVRmiDi6HT03/4tfEu0QbLOBOsdo2mE2jDcnCoRP33mbdujQIsU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709226283; c=relaxed/simple; bh=jgxgVIds0Uq+q7sp2eMMdlRM5SUWajSTadOwGNRm2Fs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=VgyeuUZ/+ldQwycJ88VIROtWT14dlgkdwH1TXwDCbpQ0cXcIp+Y4Vt6xLHzL/KsmGUVGEzVjNlPL0vynKjQ0tVFMHkyRJBJKPxbCCL+D3g4fbzGAcRXcONbZVqw5tMNZtTOTeER8+OmYnrf4el4HcMsvtD8HvHl895brRI3snes= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net; spf=pass smtp.mailfrom=digikod.net; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b=O7SkJiHr; arc=none smtp.client-ip=83.166.143.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=digikod.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b="O7SkJiHr" Received: from smtp-3-0000.mail.infomaniak.ch (smtp-3-0000.mail.infomaniak.ch [10.4.36.107]) by smtp-4-3000.mail.infomaniak.ch (Postfix) with ESMTPS id 4TlyJ06NtNz23G; Thu, 29 Feb 2024 18:04:32 +0100 (CET) Received: from unknown by smtp-3-0000.mail.infomaniak.ch (Postfix) with ESMTPA id 4TlyJ01KS6z3c; Thu, 29 Feb 2024 18:04:32 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=digikod.net; s=20191114; t=1709226272; bh=jgxgVIds0Uq+q7sp2eMMdlRM5SUWajSTadOwGNRm2Fs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O7SkJiHrACJveUBYih6KHS2MoK6Y4pu39o0bmrh+/H6EdBfY1u3VZX8uGsKFJXi+a WByMKyxBUC+h89F9ItJ41Svn8x0gBISiaYBOEAxH4PZonYP3aTFWiPtMTboZgZYUP1 9KoOsvsJogUIH9wR1oxyIDnWxnLfeIr+w9ncsLKQ= From: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= To: Brendan Higgins , David Gow , Kees Cook , Rae Moar , Shuah Khan Cc: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= , Alan Maguire , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Ingo Molnar , James Morris , Luis Chamberlain , "Madhavan T . Venkataraman" , Marco Pagani , Paolo Bonzini , Sean Christopherson , Stephen Boyd , Thara Gopinath , Thomas Gleixner , Vitaly Kuznetsov , Wanpeng Li , Zahra Tarkhani , kvm@vger.kernel.org, linux-hardening@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-um@lists.infradead.org, x86@kernel.org Subject: [PATCH v1 8/8] kunit: Add tests for faults Date: Thu, 29 Feb 2024 18:04:09 +0100 Message-ID: <20240229170409.365386-9-mic@digikod.net> In-Reply-To: <20240229170409.365386-1-mic@digikod.net> References: <20240229170409.365386-1-mic@digikod.net> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Infomaniak-Routing: alpha The first test checks NULL pointer dereference and make sure it would result as a failed test. The second and third tests check that read-only data is indeed read-only and trying to modify it would result as a failed test. This kunit_x86_fault test suite is marked as skipped when run on a non-x86 native architecture. It is then skipped on UML because such test would result to a kernel panic. Tested with: ./tools/testing/kunit/kunit.py run --arch x86_64 kunit_x86_fault Cc: Brendan Higgins Cc: David Gow Cc: Rae Moar Cc: Shuah Khan Signed-off-by: Mickaël Salaün --- lib/kunit/kunit-test.c | 115 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 114 insertions(+), 1 deletion(-) diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c index f7980ef236a3..57d8eff00c66 100644 --- a/lib/kunit/kunit-test.c +++ b/lib/kunit/kunit-test.c @@ -10,6 +10,7 @@ #include #include +#include #include #include "string-stream.h" @@ -109,6 +110,117 @@ static struct kunit_suite kunit_try_catch_test_suite = { .test_cases = kunit_try_catch_test_cases, }; +#ifdef CONFIG_X86 + +static void kunit_test_null_dereference(void *data) +{ + struct kunit *test = data; + int *null = NULL; + + *null = 0; + + KUNIT_FAIL(test, "This line should never be reached\n"); +} + +static void kunit_test_fault_null_dereference(struct kunit *test) +{ + struct kunit_try_catch_test_context *ctx = test->priv; + struct kunit_try_catch *try_catch = ctx->try_catch; + + kunit_try_catch_init(try_catch, + test, + kunit_test_null_dereference, + kunit_test_catch); + kunit_try_catch_run(try_catch, test); + + KUNIT_EXPECT_EQ(test, try_catch->try_result, -EINTR); + KUNIT_EXPECT_TRUE(test, ctx->function_called); +} + +#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) + +const int test_const = 1; + +static void kunit_test_const(void *data) +{ + struct kunit *test = data; + /* Bypasses compiler check. */ + int *ptr = (int *)&test_const; + + KUNIT_EXPECT_EQ(test, test_const, 1); + *ptr = 2; + + KUNIT_FAIL(test, "This line should never be reached\n"); +} + +static void kunit_test_fault_const(struct kunit *test) +{ + struct kunit_try_catch_test_context *ctx = test->priv; + struct kunit_try_catch *try_catch = ctx->try_catch; + + kunit_try_catch_init(try_catch, test, kunit_test_const, + kunit_test_catch); + kunit_try_catch_run(try_catch, test); + + KUNIT_EXPECT_EQ(test, test_const, 1); + KUNIT_EXPECT_EQ(test, try_catch->try_result, -EINTR); + KUNIT_EXPECT_TRUE(test, ctx->function_called); +} + +static int test_rodata __ro_after_init = 1; + +static void kunit_test_rodata(void *data) +{ + struct kunit *test = data; + + KUNIT_EXPECT_EQ(test, test_rodata, 1); + test_rodata = 2; + + KUNIT_FAIL(test, "This line should never be reached\n"); +} + +static void kunit_test_fault_rodata(struct kunit *test) +{ + struct kunit_try_catch_test_context *ctx = test->priv; + struct kunit_try_catch *try_catch = ctx->try_catch; + + if (!rodata_enabled) + kunit_skip(test, "Strict RWX is not enabled"); + + kunit_try_catch_init(try_catch, test, kunit_test_rodata, + kunit_test_catch); + kunit_try_catch_run(try_catch, test); + + KUNIT_EXPECT_EQ(test, test_rodata, 1); + KUNIT_EXPECT_EQ(test, try_catch->try_result, -EINTR); + KUNIT_EXPECT_TRUE(test, ctx->function_called); +} + +#else /* defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) */ + +static void kunit_test_fault_rodata(struct kunit *test) +{ + kunit_skip(test, "Strict RWX is not supported"); +} + +#endif /* defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) */ +#endif /* CONFIG_X86 */ + +static struct kunit_case kunit_x86_fault_test_cases[] = { +#ifdef CONFIG_X86 + KUNIT_CASE(kunit_test_fault_null_dereference), + KUNIT_CASE(kunit_test_fault_const), + KUNIT_CASE(kunit_test_fault_rodata), +#endif /* CONFIG_X86 */ + {} +}; + +static struct kunit_suite kunit_x86_fault_test_suite = { + .name = "kunit_x86_fault", + .init = kunit_try_catch_test_init, + .test_cases = kunit_x86_fault_test_cases, +}; + /* * Context for testing test managed resources * is_resource_initialized is used to test arbitrary resources @@ -826,6 +938,7 @@ static struct kunit_suite kunit_current_test_suite = { kunit_test_suites(&kunit_try_catch_test_suite, &kunit_resource_test_suite, &kunit_log_test_suite, &kunit_status_test_suite, - &kunit_current_test_suite, &kunit_device_test_suite); + &kunit_current_test_suite, &kunit_device_test_suite, + &kunit_x86_fault_test_suite); MODULE_LICENSE("GPL v2");