From patchwork Fri Nov 10 20:08:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gow X-Patchwork-Id: 13452748 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 1D6303B791 for ; Fri, 10 Nov 2023 20:08:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="tE8oHGWZ" Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43179D1 for ; Fri, 10 Nov 2023 12:08:39 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-da2b87dd614so3117570276.2 for ; Fri, 10 Nov 2023 12:08:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1699646918; x=1700251718; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=4YunHZgtb5nkD4PkAgnIRkW9gO+ZcmaQMUyBJXXvNgg=; b=tE8oHGWZbUBGyyJNmf7x2wgf8HTQb2oxOBTGnjdTnkGDx2nRbo2SIvZAE6KJgAyyjF gc9EF7wUYm8f4ZlCg9yrCarKo/GJyAt5lnOFWBXfM/SJulEMMGWJxZ9eyl0yhiqasprV Il5CQ2yO1Jd5szCNxfBiSfNdR97iric9T85I2R9xkXfRH0Hu85OVEV8gQVpYq79exny3 fFIaihfN5sTGPbEzdQNOkvRPii7SboB1CJoSeXWXdbol+5/6Kd+UJ6haQ+sK4vMfN8H5 fIXp6OoacNCkCfDiT5HqWrfP9jQoExEldZFUV76EvrzXVYzaVDLs9YayU5pFJjZPKb8N 3u+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699646918; x=1700251718; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=4YunHZgtb5nkD4PkAgnIRkW9gO+ZcmaQMUyBJXXvNgg=; b=Ap9aKkUjcxHjqJC5fdxlqeXeB8+DE0OB2RqOxxzsM6Oec8jIZDob1qc9Pp5Y4tvPFm FdKNiP5VW/mZ8KMFyK52mA49P4Gqkxlv2zIGDOZHP6EFcog82zRdJHgx3HV4UfYNc5hx 5jB+zEwOFZRQQaC7d+QRyZFp8aYJ3tcS6wCvsmqMb7FAf7+rY4kOtc8gSx1hwqw0WFl2 zOK9Ki4ttmSL8RNf0aWA2WuPt6OYYNBwf490xwsY+T6pBI6OKs0wtVnWkvUfi27jYBl1 n95Ha+DYoRhfGnhJteEEmy825vdLgIhzBzspDUXRv8rJ9fcp37mX2aA9kKLRGkxPo6T/ BPWg== X-Gm-Message-State: AOJu0YxU0DRNBLGlrOQDp5jG4DMkQnETb/GOGe6JKbIhsON4/vEC/s0Q X+jdvXQDf1V8j2ANFgC8aVHS0xspZXQFzw== X-Google-Smtp-Source: AGHT+IHpA8elPSDmxOHqJghOs6XywJyufpnZHYdeTgE8gm6TvPMzYUyvszmAZYiKI4lKiyHTNGpdXhSKe/S/Cw== X-Received: from slicestar.c.googlers.com ([fda3:e722:ac3:cc00:4f:4b78:c0a8:20a1]) (user=davidgow job=sendgmr) by 2002:a25:d849:0:b0:d9a:f3dc:7d18 with SMTP id p70-20020a25d849000000b00d9af3dc7d18mr3271ybg.13.1699646918475; Fri, 10 Nov 2023 12:08:38 -0800 (PST) Date: Sat, 11 Nov 2023 04:08:26 +0800 Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.42.0.869.gea05f2083d-goog Message-ID: <20231110200830.1832556-1-davidgow@google.com> Subject: [PATCH 1/3] kunit: Add a macro to wrap a deferred action function From: David Gow To: Nathan Chancellor , Kees Cook , Brendan Higgins , Rae Moar , dlatypov@google.com, Maxime Ripard , Arthur Grillo , Shuah Khan Cc: David Gow , " =?utf-8?q?Ma=C3=ADra_Canal?= " , Sami Tolvanen , kunit-dev@googlegroups.com, llvm@lists.linux.dev, linux-hardening@vger.kernel.org, linux-kselftest@vger.kernel.org, Benjamin Berg , Richard Fitzgerald , linux-kernel@vger.kernel.org, Maarten Lankhorst , Thomas Zimmermann , Emma Anholt , David Airlie , Daniel Vetter , dri-devel@lists.freedesktop.org KUnit's deferred action API accepts a void(*)(void *) function pointer which is called when the test is exited. However, we very frequently want to use existing functions which accept a single pointer, but which may not be of type void*. While this is probably dodgy enough to be on the wrong side of the C standard, it's been often used for similar callbacks, and gcc's -Wcast-function-type seems to ignore cases where the only difference is the type of the argument, assuming it's compatible (i.e., they're both pointers to data). However, clang 16 has introduced -Wcast-function-type-strict, which no longer permits any deviation in function pointer type. This seems to be because it'd break CFI, which validates the type of function calls. This rather ruins our attempts to cast functions to defer them, and leaves us with a few options. The one we've chosen is to implement a macro which will generate a wrapper function which accepts a void*, and casts the argument to the appropriate type. For example, if you were trying to wrap: void foo_close(struct foo *handle); you could use: KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_foo_close, foo_close, struct foo *); This would create a new kunit_action_foo_close() function, of type kunit_action_t, which could be passed into kunit_add_action() and similar functions. In addition to defining this macro, update KUnit and its tests to use it. Link: https://github.com/ClangBuiltLinux/linux/issues/1750 Signed-off-by: David Gow Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor Reviewed-by: Maxime Ripard Acked-by: Daniel Vetter for merging through kunit --- This is a follow-up to the RFC here: https://lore.kernel.org/linux-kselftest/20230915050125.3609689-1-davidgow@google.com/ There's no difference in the macro implementation, just an update to the KUnit tests to use it. This version is intended to complement: https://lore.kernel.org/all/20231106172557.2963-1-rf@opensource.cirrus.com/ There are also two follow-up patches in the series to use this macro in various DRM tests. Hopefully this will solve any CFI issues that show up with KUnit. Thanks, -- David --- include/kunit/resource.h | 9 +++++++++ lib/kunit/kunit-test.c | 5 +---- lib/kunit/test.c | 6 ++++-- 3 files changed, 14 insertions(+), 6 deletions(-) diff --git a/include/kunit/resource.h b/include/kunit/resource.h index c7383e90f5c9..4110e13970dc 100644 --- a/include/kunit/resource.h +++ b/include/kunit/resource.h @@ -390,6 +390,15 @@ void kunit_remove_resource(struct kunit *test, struct kunit_resource *res); /* A 'deferred action' function to be used with kunit_add_action. */ typedef void (kunit_action_t)(void *); +/* We can't cast function pointers to kunit_action_t if CFI is enabled. */ +#define KUNIT_DEFINE_ACTION_WRAPPER(wrapper, orig, arg_type) \ + static void wrapper(void *in) \ + { \ + arg_type arg = (arg_type)in; \ + orig(arg); \ + } + + /** * kunit_add_action() - Call a function when the test ends. * @test: Test case to associate the action with. diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c index de2113a58fa0..ee6927c60979 100644 --- a/lib/kunit/kunit-test.c +++ b/lib/kunit/kunit-test.c @@ -538,10 +538,7 @@ static struct kunit_suite kunit_resource_test_suite = { #if IS_BUILTIN(CONFIG_KUNIT_TEST) /* This avoids a cast warning if kfree() is passed direct to kunit_add_action(). */ -static void kfree_wrapper(void *p) -{ - kfree(p); -} +KUNIT_DEFINE_ACTION_WRAPPER(kfree_wrapper, kfree, const void *); static void kunit_log_test(struct kunit *test) { diff --git a/lib/kunit/test.c b/lib/kunit/test.c index f2eb71f1a66c..0308865194bb 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -772,6 +772,8 @@ static struct notifier_block kunit_mod_nb = { }; #endif +KUNIT_DEFINE_ACTION_WRAPPER(kfree_action_wrapper, kfree, const void *) + void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp) { void *data; @@ -781,7 +783,7 @@ void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp) if (!data) return NULL; - if (kunit_add_action_or_reset(test, (kunit_action_t *)kfree, data) != 0) + if (kunit_add_action_or_reset(test, kfree_action_wrapper, data) != 0) return NULL; return data; @@ -793,7 +795,7 @@ void kunit_kfree(struct kunit *test, const void *ptr) if (!ptr) return; - kunit_release_action(test, (kunit_action_t *)kfree, (void *)ptr); + kunit_release_action(test, kfree_action_wrapper, (void *)ptr); } EXPORT_SYMBOL_GPL(kunit_kfree); From patchwork Fri Nov 10 20:08:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gow X-Patchwork-Id: 13452749 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 D32A53B792 for ; Fri, 10 Nov 2023 20:08:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Z8z0hd3r" Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 972039D for ; Fri, 10 Nov 2023 12:08:43 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-da307fb7752so3032015276.0 for ; Fri, 10 Nov 2023 12:08:43 -0800 (PST) DKIM-Signature: v=1; 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Fri, 10 Nov 2023 12:08:42 -0800 (PST) Date: Sat, 11 Nov 2023 04:08:27 +0800 In-Reply-To: <20231110200830.1832556-1-davidgow@google.com> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20231110200830.1832556-1-davidgow@google.com> X-Mailer: git-send-email 2.42.0.869.gea05f2083d-goog Message-ID: <20231110200830.1832556-2-davidgow@google.com> Subject: [PATCH 2/3] drm/tests: Use KUNIT_DEFINE_ACTION_WRAPPER() From: David Gow To: Nathan Chancellor , Kees Cook , Brendan Higgins , Rae Moar , dlatypov@google.com, Maxime Ripard , Arthur Grillo , Shuah Khan Cc: David Gow , " =?utf-8?q?Ma=C3=ADra_Canal?= " , Sami Tolvanen , kunit-dev@googlegroups.com, llvm@lists.linux.dev, linux-hardening@vger.kernel.org, linux-kselftest@vger.kernel.org, Benjamin Berg , Richard Fitzgerald , linux-kernel@vger.kernel.org, Maarten Lankhorst , Thomas Zimmermann , Emma Anholt , David Airlie , Daniel Vetter , dri-devel@lists.freedesktop.org In order to pass functions to kunit_add_action(), they need to be of the kunit_action_t type. While casting the function pointer can work, it will break control-flow integrity. drm_kunit_helpers already defines wrappers, but we now have a macro which does this automatically. Using this greatly reduces the boilerplate needed. Signed-off-by: David Gow Acked-by: Maxime Ripard --- This patch should be a no-op, just moving to use a standard macro to implement these wrappers rather than hand-coding them. Let me know if you'd prefer to take these in separately via the drm trees, or if you're okay with having this whole series go via kselftest/kunit. Cheers, -- David --- drivers/gpu/drm/tests/drm_kunit_helpers.c | 30 +++++++---------------- 1 file changed, 9 insertions(+), 21 deletions(-) diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c index bccb33b900f3..c251e6b34de0 100644 --- a/drivers/gpu/drm/tests/drm_kunit_helpers.c +++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c @@ -27,27 +27,15 @@ static struct platform_driver fake_platform_driver = { }, }; -static void kunit_action_platform_driver_unregister(void *ptr) -{ - struct platform_driver *drv = ptr; - - platform_driver_unregister(drv); - -} - -static void kunit_action_platform_device_put(void *ptr) -{ - struct platform_device *pdev = ptr; - - platform_device_put(pdev); -} - -static void kunit_action_platform_device_del(void *ptr) -{ - struct platform_device *pdev = ptr; - - platform_device_del(pdev); -} +KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_driver_unregister, + platform_driver_unregister, + struct platform_driver *); +KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_device_put, + platform_device_put, + struct platform_device *); +KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_device_del, + platform_device_del, + struct platform_device *); /** * drm_kunit_helper_alloc_device - Allocate a mock device for a KUnit test From patchwork Fri Nov 10 20:08:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gow X-Patchwork-Id: 13452750 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 5D98F3B788 for ; Fri, 10 Nov 2023 20:08:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="JAujfGHJ" Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C80E7D2 for ; Fri, 10 Nov 2023 12:08:47 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-daa2684f67eso1952210276.0 for ; Fri, 10 Nov 2023 12:08:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1699646927; x=1700251727; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=IAkJ89LUqtxG0K+MSJnco+XQD27u+TKLaVoOcPh4bOc=; b=JAujfGHJ8yOYNMAj+/UzMg5ghYS5kqcl7r5wvrjHHCdl2sM8xOiTkUGnVaF+EHQjJb TmJhenOTUE/qPxBsjJBqd7QjAUK89cbdB2q1c7corDKfnE2MywVyc4qjt2FMEwkQaUqA JLopDWEh9Zx6/9lehNFw0qyeeunwaCl3uO2oj/yVVL6EeBZFs80cjPKM1MxFsuubgqZm 22YQEEAIjx0YRE7ZRv6AW7TsH4v6Bk9y2NYAkZIXYVKPKPdyCQFiz5UYFVzVbqd8ZJbg nAsYZInmjMEDKXuvMtX6lr2Urrl+kIUb81TOODAcX6wlIIdlBiY4HC+oOBC3CurBJGCu Ll4Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699646927; x=1700251727; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; 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While casting the function pointer can work, it will break control-flow integrity. vc4_mock already defines such a wrapper for drm_dev_unregister(), but it involves less boilerplate to use the new macro, so replace the manual implementation. Signed-off-by: David Gow --- This patch should be a no-op, just moving to use a standard macro to implement these wrappers rather than hand-coding them. Let me know if you'd prefer to take these in separately via the drm trees, or if you're okay with having this whole series go via kselftest/kunit. Cheers, -- David --- drivers/gpu/drm/vc4/tests/vc4_mock.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/vc4/tests/vc4_mock.c b/drivers/gpu/drm/vc4/tests/vc4_mock.c index 63ca46f4cb35..becb3dbaa548 100644 --- a/drivers/gpu/drm/vc4/tests/vc4_mock.c +++ b/drivers/gpu/drm/vc4/tests/vc4_mock.c @@ -153,12 +153,9 @@ static int __build_mock(struct kunit *test, struct drm_device *drm, return 0; } -static void kunit_action_drm_dev_unregister(void *ptr) -{ - struct drm_device *drm = ptr; - - drm_dev_unregister(drm); -} +KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_drm_dev_unregister, + drm_dev_unregister, + struct drm_device *); static struct vc4_dev *__mock_device(struct kunit *test, bool is_vc5) {