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Message-Id: <20200718005141.440405-1-vitor@massaru.org>
Date: Fri, 17 Jul 2020 21:51:41 -0300
From: Vitor Massaru Iha <vitor@...saru.org>
To: kunit-dev@...glegroups.com
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
brendanhiggins@...gle.com, keescook@...omium.org,
davidgow@...gle.com, skhan@...uxfoundation.org,
linux-kernel-mentees@...ts.linuxfoundation.org
Subject: [PATCH v2] lib: Convert test_user_copy to KUnit test
This adds the conversion of the runtime tests of test_user_copy fuctions,
from `lib/test_user_copy.c` to KUnit tests.
Signed-off-by: Vitor Massaru Iha <vitor@...saru.org>
---
v2:
* splitted patch in 3:
- Allows to install and load modules in root filesystem;
- Provides an userspace memory context when tests are compiled
as module;
- Convert test_user_copy to KUnit test;
* removed entry for CONFIG_TEST_USER_COPY;
* replaced pr_warn to KUNIT_EXPECT_FALSE_MSG in test macro to
decrease the diff;
---
lib/Kconfig.debug | 28 ++++++++------
lib/Makefile | 2 +-
lib/{test_user_copy.c => user_copy_kunit.c} | 42 +++++++++------------
3 files changed, 35 insertions(+), 37 deletions(-)
rename lib/{test_user_copy.c => user_copy_kunit.c} (91%)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 9ad9210d70a1..f699a3624ae7 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2078,18 +2078,6 @@ config TEST_VMALLOC
If unsure, say N.
-config TEST_USER_COPY
- tristate "Test user/kernel boundary protections"
- depends on m
- help
- This builds the "test_user_copy" module that runs sanity checks
- on the copy_to/from_user infrastructure, making sure basic
- user/kernel boundary testing is working. If it fails to load,
- a regression has been detected in the user/kernel memory boundary
- protections.
-
- If unsure, say N.
-
config TEST_BPF
tristate "Test BPF filter functionality"
depends on m && NET
@@ -2154,6 +2142,22 @@ config SYSCTL_KUNIT_TEST
If unsure, say N.
+config USER_COPY_KUNIT
+ tristate "KUnit Test for user/kernel boundary protections"
+ depends on KUNIT
+ depends on m
+ help
+ This builds the "user_copy_kunit" module that runs sanity checks
+ on the copy_to/from_user infrastructure, making sure basic
+ user/kernel boundary testing is working. If it fails to load,
+ a regression has been detected in the user/kernel memory boundary
+ protections.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
config LIST_KUNIT_TEST
tristate "KUnit Test for Kernel Linked-list structures" if !KUNIT_ALL_TESTS
depends on KUNIT
diff --git a/lib/Makefile b/lib/Makefile
index b1c42c10073b..8c145f85accc 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -78,7 +78,6 @@ obj-$(CONFIG_TEST_VMALLOC) += test_vmalloc.o
obj-$(CONFIG_TEST_OVERFLOW) += test_overflow.o
obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o
obj-$(CONFIG_TEST_SORT) += test_sort.o
-obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
obj-$(CONFIG_TEST_PRINTF) += test_printf.o
@@ -318,3 +317,4 @@ obj-$(CONFIG_OBJAGG) += objagg.o
# KUnit tests
obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o
obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o
+obj-$(CONFIG_USER_COPY_KUNIT) += user_copy_kunit.o
diff --git a/lib/test_user_copy.c b/lib/user_copy_kunit.c
similarity index 91%
rename from lib/test_user_copy.c
rename to lib/user_copy_kunit.c
index 5ff04d8fe971..a10ddd15b4cd 100644
--- a/lib/test_user_copy.c
+++ b/lib/user_copy_kunit.c
@@ -16,6 +16,7 @@
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
+#include <kunit/test.h>
/*
* Several 32-bit architectures support 64-bit {get,put}_user() calls.
@@ -35,7 +36,7 @@
({ \
int cond = (condition); \
if (cond) \
- pr_warn("[%d] " msg "\n", __LINE__, ##__VA_ARGS__); \
+ KUNIT_EXPECT_FALSE_MSG(test, cond, msg, ##__VA_ARGS__); \
cond; \
})
@@ -44,7 +45,7 @@ static bool is_zeroed(void *from, size_t size)
return memchr_inv(from, 0x0, size) == NULL;
}
-static int test_check_nonzero_user(char *kmem, char __user *umem, size_t size)
+static int test_check_nonzero_user(struct kunit *test, char *kmem, char __user *umem, size_t size)
{
int ret = 0;
size_t start, end, i, zero_start, zero_end;
@@ -102,7 +103,7 @@ static int test_check_nonzero_user(char *kmem, char __user *umem, size_t size)
return ret;
}
-static int test_copy_struct_from_user(char *kmem, char __user *umem,
+static int test_copy_struct_from_user(struct kunit *test, char *kmem, char __user *umem,
size_t size)
{
int ret = 0;
@@ -177,7 +178,7 @@ static int test_copy_struct_from_user(char *kmem, char __user *umem,
return ret;
}
-static int __init test_user_copy_init(void)
+static void user_copy_test(struct kunit *test)
{
int ret = 0;
char *kmem;
@@ -192,16 +193,14 @@ static int __init test_user_copy_init(void)
#endif
kmem = kmalloc(PAGE_SIZE * 2, GFP_KERNEL);
- if (!kmem)
- return -ENOMEM;
+ KUNIT_EXPECT_FALSE_MSG(test, kmem == NULL, "kmalloc failed");
user_addr = vm_mmap(NULL, 0, PAGE_SIZE * 2,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_ANONYMOUS | MAP_PRIVATE, 0);
if (user_addr >= (unsigned long)(TASK_SIZE)) {
- pr_warn("Failed to allocate user memory\n");
kfree(kmem);
- return -ENOMEM;
+ KUNIT_FAIL(test, "Failed to allocate user memory");
}
usermem = (char __user *)user_addr;
@@ -245,9 +244,9 @@ static int __init test_user_copy_init(void)
#undef test_legit
/* Test usage of check_nonzero_user(). */
- ret |= test_check_nonzero_user(kmem, usermem, 2 * PAGE_SIZE);
+ ret |= test_check_nonzero_user(test, kmem, usermem, 2 * PAGE_SIZE);
/* Test usage of copy_struct_from_user(). */
- ret |= test_copy_struct_from_user(kmem, usermem, 2 * PAGE_SIZE);
+ ret |= test_copy_struct_from_user(test, kmem, usermem, 2 * PAGE_SIZE);
/*
* Invalid usage: none of these copies should succeed.
@@ -309,23 +308,18 @@ static int __init test_user_copy_init(void)
vm_munmap(user_addr, PAGE_SIZE * 2);
kfree(kmem);
-
- if (ret == 0) {
- pr_info("tests passed.\n");
- return 0;
- }
-
- return -EINVAL;
}
-module_init(test_user_copy_init);
-
-static void __exit test_user_copy_exit(void)
-{
- pr_info("unloaded.\n");
-}
+static struct kunit_case user_copy_test_cases[] = {
+ KUNIT_CASE(user_copy_test),
+ {}
+};
-module_exit(test_user_copy_exit);
+static struct kunit_suite user_copy_test_suite = {
+ .name = "user_copy",
+ .test_cases = user_copy_test_cases,
+};
+kunit_test_suites(&user_copy_test_suite);
MODULE_AUTHOR("Kees Cook <keescook@...omium.org>");
MODULE_LICENSE("GPL");
base-commit: 725aca9585956676687c4cb803e88f770b0df2b2
prerequisite-patch-id: 5e5f9a8a05c5680fda1b04c9ab1b95ce91dc88b2
prerequisite-patch-id: 4d997940f4a9f303424af9bac412de1af861f9d9
prerequisite-patch-id: 582b6d9d28ce4b71628890ec832df6522ca68de0
prerequisite-patch-id: 5cd745ed9bbb0b36010c5de8adc19bfa86ad8be0
prerequisite-patch-id: 42f17b389ec15baf50dd1c43f6e30b8d2dff7964
--
2.26.2
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