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firewire: add KUnit test to check layout of UAPI structures

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In future commits, some new structure will be added to express new type
of event. They are exposed to user space as the part of UAPI. It is likely
to get trouble in ioctl compatibility layer for 32 bit binaries in 64 bit
host machine since the layout of structure could differ depending on
System V ABI for these architectures. Actually the subsystem already got
such trouble at v2.6.27. It is preferable to decide the layout of
structure carefully so that the layer is free from such trouble.

This commit utilizes KUnit framework to check the layout of structure for
the purpose. A test is added for the existent issue.

Cc: kunit-dev@googlegroups.com
Link: https://lore.kernel.org/r/20230529113406.986289-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
This commit is contained in:
Takashi Sakamoto 2023-05-30 08:12:39 +09:00
parent 44c026a73b
commit dc7c51638f
4 changed files with 61 additions and 0 deletions
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4
drivers/firewire/.kunitconfig Normal file
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@ -0,0 +1,4 @@
CONFIG_KUNIT=y
CONFIG_PCI=y
CONFIG_FIREWIRE=y
CONFIG_FIREWIRE_KUNIT_UAPI_TEST=y

16
drivers/firewire/Kconfig
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@ -18,6 +18,22 @@ config FIREWIRE
To compile this driver as a module, say M here: the module will be
called firewire-core.
config FIREWIRE_KUNIT_UAPI_TEST
tristate "KUnit tests for layout of structure in UAPI" if !KUNIT_ALL_TESTS
depends on FIREWIRE && KUNIT
default KUNIT_ALL_TESTS
help
This builds the KUnit tests whether structures exposed to user
space have expected layout.
KUnit tests run during boot and output the results to the debug
log in TAP format (https://testanything.org/). Only useful for
kernel devs running KUnit test harness and are not for inclusion
into a production build.
For more information on KUnit and unit tests in general, refer
to the KUnit documentation in Documentation/dev-tools/kunit/.
config FIREWIRE_OHCI
tristate "OHCI-1394 controllers"
depends on PCI && FIREWIRE && MMU

3
drivers/firewire/Makefile
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@ -15,3 +15,6 @@ obj-$(CONFIG_FIREWIRE_SBP2) += firewire-sbp2.o
obj-$(CONFIG_FIREWIRE_NET) += firewire-net.o
obj-$(CONFIG_FIREWIRE_NOSY) += nosy.o
obj-$(CONFIG_PROVIDE_OHCI1394_DMA_INIT) += init_ohci1394_dma.o
firewire-uapi-test-objs += uapi-test.o
obj-$(CONFIG_FIREWIRE_KUNIT_UAPI_TEST) += firewire-uapi-test.o

38
drivers/firewire/uapi-test.c Normal file
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@ -0,0 +1,38 @@
// SPDX-License-Identifier: GPL-2.0-only
//
// uapi_test.c - An application of Kunit to check layout of structures exposed to user space for
// FireWire subsystem.
//
// Copyright (c) 2023 Takashi Sakamoto
#include <kunit/test.h>
#include <linux/firewire-cdev.h>
// Known issue added at v2.6.27 kernel.
static void structure_layout_event_response(struct kunit *test)
{
#if defined(CONFIG_X86_32)
// 4 bytes alignment for aggregate type including 8 bytes storage types.
KUNIT_EXPECT_EQ(test, 20, sizeof(struct fw_cdev_event_response));
#else
// 8 bytes alignment for aggregate type including 8 bytes storage types.
KUNIT_EXPECT_EQ(test, 24, sizeof(struct fw_cdev_event_response));
#endif
KUNIT_EXPECT_EQ(test, 0, offsetof(struct fw_cdev_event_response, closure));
KUNIT_EXPECT_EQ(test, 8, offsetof(struct fw_cdev_event_response, type));
KUNIT_EXPECT_EQ(test, 12, offsetof(struct fw_cdev_event_response, rcode));
KUNIT_EXPECT_EQ(test, 16, offsetof(struct fw_cdev_event_response, length));
KUNIT_EXPECT_EQ(test, 20, offsetof(struct fw_cdev_event_response, data));
}
static struct kunit_case structure_layout_test_cases[] = {
KUNIT_CASE(structure_layout_event_response),
{}
};
static struct kunit_suite structure_layout_test_suite = {
.name = "firewire-uapi-structure-layout",
.test_cases = structure_layout_test_cases,
};
kunit_test_suite(structure_layout_test_suite);