forked from Minki/linux
lib: stackinit: Convert to KUnit
Convert stackinit unit tests to KUnit, for better integration
into the kernel self test framework. Includes a rename of
test_stackinit.c to stackinit_kunit.c, and CONFIG_TEST_STACKINIT to
CONFIG_STACKINIT_KUNIT_TEST.
Adjust expected test results based on which stack initialization method
was chosen:
$ CMD="./tools/testing/kunit/kunit.py run stackinit --raw_output \
--arch=x86_64 --kconfig_add"
$ $CMD | grep stackinit:
# stackinit: pass:36 fail:0 skip:29 total:65
$ $CMD CONFIG_GCC_PLUGIN_STRUCTLEAK_USER=y | grep stackinit:
# stackinit: pass:37 fail:0 skip:28 total:65
$ $CMD CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF=y | grep stackinit:
# stackinit: pass:55 fail:0 skip:10 total:65
$ $CMD CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=y | grep stackinit:
# stackinit: pass:62 fail:0 skip:3 total:65
$ $CMD CONFIG_INIT_STACK_ALL_PATTERN=y --make_option LLVM=1 | grep stackinit:
# stackinit: pass:60 fail:0 skip:5 total:65
$ $CMD CONFIG_INIT_STACK_ALL_ZERO=y --make_option LLVM=1 | grep stackinit:
# stackinit: pass:60 fail:0 skip:5 total:65
Temporarily remove the userspace-build mode, which will be restored in a
later patch.
Expand the size of the pre-case switch variable so it doesn't get
accidentally cleared.
Cc: David Gow <davidgow@google.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
v1: https://lore.kernel.org/lkml/20220224055145.1853657-1-keescook@chromium.org
v2:
- split "userspace KUnit stub" into separate header and patch (Daniel)
- Improve commit log and comments (David)
- Provide mapping of expected XFAIL tests to CONFIGs (David)
This commit is contained in:
Kees Cook
parent
c7500c1b53
commit
02788ebcf5
@ -2511,6 +2511,17 @@ config OVERFLOW_KUNIT_TEST
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If unsure, say N.
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config STACKINIT_KUNIT_TEST
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tristate "Test level of stack variable initialization" if !KUNIT_ALL_TESTS
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depends on KUNIT
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default KUNIT_ALL_TESTS
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help
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Test if the kernel is zero-initializing stack variables and
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padding. Coverage is controlled by compiler flags,
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CONFIG_INIT_STACK_ALL_PATTERN, CONFIG_INIT_STACK_ALL_ZERO,
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CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF,
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or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL.
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config TEST_UDELAY
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tristate "udelay test driver"
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help
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@ -2602,17 +2613,6 @@ config TEST_OBJAGG
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Enable this option to test object aggregation manager on boot
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(or module load).
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config TEST_STACKINIT
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tristate "Test level of stack variable initialization"
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help
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Test if the kernel is zero-initializing stack variables and
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padding. Coverage is controlled by compiler flags,
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CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF,
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or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL.
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If unsure, say N.
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config TEST_MEMINIT
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tristate "Test heap/page initialization"
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help
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@ -93,8 +93,6 @@ obj-$(CONFIG_TEST_KMOD) += test_kmod.o
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obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o
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obj-$(CONFIG_TEST_MEMCAT_P) += test_memcat_p.o
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obj-$(CONFIG_TEST_OBJAGG) += test_objagg.o
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CFLAGS_test_stackinit.o += $(call cc-disable-warning, switch-unreachable)
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obj-$(CONFIG_TEST_STACKINIT) += test_stackinit.o
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obj-$(CONFIG_TEST_BLACKHOLE_DEV) += test_blackhole_dev.o
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obj-$(CONFIG_TEST_MEMINIT) += test_meminit.o
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obj-$(CONFIG_TEST_LOCKUP) += test_lockup.o
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@ -363,6 +361,8 @@ obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
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obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o
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obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o
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obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o
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CFLAGS_stackinit_kunit.o += $(call cc-disable-warning, switch-unreachable)
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obj-$(CONFIG_STACKINIT_KUNIT_TEST) += stackinit_kunit.o
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obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o
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@ -2,76 +2,21 @@
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/*
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* Test cases for compiler-based stack variable zeroing via
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* -ftrivial-auto-var-init={zero,pattern} or CONFIG_GCC_PLUGIN_STRUCTLEAK*.
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* For example, see:
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* https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests
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* ./tools/testing/kunit/kunit.py run stackinit [--raw_output] \
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* --make_option LLVM=1 \
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* --kconfig_add CONFIG_INIT_STACK_ALL_ZERO=y
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*
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* External build example:
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* clang -O2 -Wall -ftrivial-auto-var-init=pattern \
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* -o test_stackinit test_stackinit.c
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*/
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#ifdef __KERNEL__
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <kunit/test.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#else
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/* Userspace headers. */
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <sys/types.h>
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/* Linux kernel-ism stubs for stand-alone userspace build. */
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#define KBUILD_MODNAME "stackinit"
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define pr_err(fmt, ...) fprintf(stderr, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_warn(fmt, ...) fprintf(stderr, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_info(fmt, ...) fprintf(stdout, pr_fmt(fmt), ##__VA_ARGS__)
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#define __init /**/
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#define __exit /**/
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#define __user /**/
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#define noinline __attribute__((__noinline__))
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#define __aligned(x) __attribute__((__aligned__(x)))
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#ifdef __clang__
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# define __compiletime_error(message) /**/
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#else
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# define __compiletime_error(message) __attribute__((__error__(message)))
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#endif
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#define __compiletime_assert(condition, msg, prefix, suffix) \
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do { \
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extern void prefix ## suffix(void) __compiletime_error(msg); \
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if (!(condition)) \
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prefix ## suffix(); \
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} while (0)
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#define _compiletime_assert(condition, msg, prefix, suffix) \
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__compiletime_assert(condition, msg, prefix, suffix)
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#define compiletime_assert(condition, msg) \
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_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
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#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
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#define BUILD_BUG_ON(condition) \
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BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
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typedef uint8_t u8;
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typedef uint16_t u16;
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typedef uint32_t u32;
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typedef uint64_t u64;
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#define module_init(func) static int (*do_init)(void) = func
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#define module_exit(func) static void (*do_exit)(void) = func
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#define MODULE_LICENSE(str) int main(void) { \
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int rc; \
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/* License: str */ \
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rc = do_init(); \
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if (rc == 0) \
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do_exit(); \
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return rc; \
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}
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#endif /* __KERNEL__ */
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/* Exfiltration buffer. */
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#define MAX_VAR_SIZE 128
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static u8 check_buf[MAX_VAR_SIZE];
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@ -201,7 +146,7 @@ static bool range_contains(char *haystack_start, size_t haystack_size,
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*/
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#define DEFINE_TEST_DRIVER(name, var_type, which, xfail) \
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/* Returns 0 on success, 1 on failure. */ \
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static noinline __init int test_ ## name (void) \
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static noinline void test_ ## name (struct kunit *test) \
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{ \
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var_type zero INIT_CLONE_ ## which; \
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int ignored; \
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@ -220,10 +165,8 @@ static noinline __init int test_ ## name (void) \
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/* Verify all bytes overwritten with 0xFF. */ \
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for (sum = 0, i = 0; i < target_size; i++) \
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sum += (check_buf[i] != 0xFF); \
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if (sum) { \
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pr_err(#name ": leaf fill was not 0xFF!?\n"); \
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return 1; \
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} \
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KUNIT_ASSERT_EQ_MSG(test, sum, 0, \
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"leaf fill was not 0xFF!?\n"); \
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/* Clear entire check buffer for later bit tests. */ \
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memset(check_buf, 0x00, sizeof(check_buf)); \
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/* Extract stack-defined variable contents. */ \
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@ -231,32 +174,29 @@ static noinline __init int test_ ## name (void) \
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FETCH_ARG_ ## which(zero)); \
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\
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/* Validate that compiler lined up fill and target. */ \
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if (!range_contains(fill_start, fill_size, \
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target_start, target_size)) { \
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pr_err(#name ": stack fill missed target!?\n"); \
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pr_err(#name ": fill %zu wide\n", fill_size); \
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pr_err(#name ": target offset by %d\n", \
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(int)((ssize_t)(uintptr_t)fill_start - \
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(ssize_t)(uintptr_t)target_start)); \
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return 1; \
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} \
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KUNIT_ASSERT_TRUE_MSG(test, \
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range_contains(fill_start, fill_size, \
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target_start, target_size), \
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"stack fill missed target!? " \
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"(fill %zu wide, target offset by %d)\n", \
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fill_size, \
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(int)((ssize_t)(uintptr_t)fill_start - \
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(ssize_t)(uintptr_t)target_start)); \
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\
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/* Look for any bytes still 0xFF in check region. */ \
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for (sum = 0, i = 0; i < target_size; i++) \
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sum += (check_buf[i] == 0xFF); \
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\
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if (sum == 0) { \
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pr_info(#name " ok\n"); \
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return 0; \
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} else { \
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pr_warn(#name " %sFAIL (uninit bytes: %d)\n", \
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(xfail) ? "X" : "", sum); \
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return (xfail) ? 0 : 1; \
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} \
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if (sum != 0 && xfail) \
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kunit_skip(test, \
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"XFAIL uninit bytes: %d\n", \
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sum); \
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KUNIT_ASSERT_EQ_MSG(test, sum, 0, \
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"uninit bytes: %d\n", sum); \
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}
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#define DEFINE_TEST(name, var_type, which, init_level, xfail) \
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/* no-op to force compiler into ignoring "uninitialized" vars */\
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static noinline __init DO_NOTHING_TYPE_ ## which(var_type) \
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static noinline DO_NOTHING_TYPE_ ## which(var_type) \
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do_nothing_ ## name(var_type *ptr) \
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{ \
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/* Will always be true, but compiler doesn't know. */ \
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@ -265,9 +205,8 @@ do_nothing_ ## name(var_type *ptr) \
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else \
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return DO_NOTHING_RETURN_ ## which(ptr + 1); \
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} \
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static noinline __init int leaf_ ## name(unsigned long sp, \
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bool fill, \
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var_type *arg) \
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static noinline int leaf_ ## name(unsigned long sp, bool fill, \
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var_type *arg) \
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{ \
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char buf[VAR_BUFFER]; \
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var_type var \
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@ -341,6 +280,27 @@ struct test_user {
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unsigned long four;
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};
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#define ALWAYS_PASS WANT_SUCCESS
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#define ALWAYS_FAIL XFAIL
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#ifdef CONFIG_INIT_STACK_NONE
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# define USER_PASS XFAIL
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# define BYREF_PASS XFAIL
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# define STRONG_PASS XFAIL
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#elif defined(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)
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# define USER_PASS WANT_SUCCESS
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# define BYREF_PASS XFAIL
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# define STRONG_PASS XFAIL
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#elif defined(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)
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# define USER_PASS WANT_SUCCESS
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# define BYREF_PASS WANT_SUCCESS
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# define STRONG_PASS XFAIL
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#else
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# define USER_PASS WANT_SUCCESS
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# define BYREF_PASS WANT_SUCCESS
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# define STRONG_PASS WANT_SUCCESS
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#endif
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#define DEFINE_SCALAR_TEST(name, init, xfail) \
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DEFINE_TEST(name ## _ ## init, name, SCALAR, \
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init, xfail)
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@ -364,27 +324,26 @@ struct test_user {
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DEFINE_STRUCT_TEST(trailing_hole, init, xfail); \
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DEFINE_STRUCT_TEST(packed, init, xfail)
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#define DEFINE_STRUCT_INITIALIZER_TESTS(base) \
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#define DEFINE_STRUCT_INITIALIZER_TESTS(base, xfail) \
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DEFINE_STRUCT_TESTS(base ## _ ## partial, \
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WANT_SUCCESS); \
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DEFINE_STRUCT_TESTS(base ## _ ## all, \
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WANT_SUCCESS)
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xfail); \
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DEFINE_STRUCT_TESTS(base ## _ ## all, xfail)
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/* These should be fully initialized all the time! */
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DEFINE_SCALAR_TESTS(zero, WANT_SUCCESS);
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DEFINE_STRUCT_TESTS(zero, WANT_SUCCESS);
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DEFINE_SCALAR_TESTS(zero, ALWAYS_PASS);
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DEFINE_STRUCT_TESTS(zero, ALWAYS_PASS);
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/* Struct initializers: padding may be left uninitialized. */
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DEFINE_STRUCT_INITIALIZER_TESTS(static);
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DEFINE_STRUCT_INITIALIZER_TESTS(dynamic);
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DEFINE_STRUCT_INITIALIZER_TESTS(runtime);
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DEFINE_STRUCT_INITIALIZER_TESTS(assigned_static);
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DEFINE_STRUCT_INITIALIZER_TESTS(assigned_dynamic);
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DEFINE_STRUCT_TESTS(assigned_copy, XFAIL);
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DEFINE_STRUCT_INITIALIZER_TESTS(static, STRONG_PASS);
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DEFINE_STRUCT_INITIALIZER_TESTS(dynamic, STRONG_PASS);
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DEFINE_STRUCT_INITIALIZER_TESTS(runtime, STRONG_PASS);
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DEFINE_STRUCT_INITIALIZER_TESTS(assigned_static, STRONG_PASS);
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DEFINE_STRUCT_INITIALIZER_TESTS(assigned_dynamic, STRONG_PASS);
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DEFINE_STRUCT_TESTS(assigned_copy, ALWAYS_FAIL);
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/* No initialization without compiler instrumentation. */
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DEFINE_SCALAR_TESTS(none, WANT_SUCCESS);
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DEFINE_STRUCT_TESTS(none, WANT_SUCCESS);
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DEFINE_SCALAR_TESTS(none, STRONG_PASS);
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DEFINE_STRUCT_TESTS(none, BYREF_PASS);
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/* Initialization of members with __user attribute. */
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DEFINE_TEST(user, struct test_user, STRUCT, none, WANT_SUCCESS);
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DEFINE_TEST(user, struct test_user, STRUCT, none, USER_PASS);
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/*
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* Check two uses through a variable declaration outside either path,
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@ -398,7 +357,7 @@ static int noinline __leaf_switch_none(int path, bool fill)
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* This is intentionally unreachable. To silence the
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* warning, build with -Wno-switch-unreachable
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*/
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uint64_t var;
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uint64_t var[10];
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case 1:
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target_start = &var;
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@ -423,19 +382,19 @@ static int noinline __leaf_switch_none(int path, bool fill)
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memcpy(check_buf, target_start, target_size);
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break;
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default:
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var = 5;
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return var & forced_mask;
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var[1] = 5;
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return var[1] & forced_mask;
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}
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return 0;
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}
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static noinline __init int leaf_switch_1_none(unsigned long sp, bool fill,
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static noinline int leaf_switch_1_none(unsigned long sp, bool fill,
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uint64_t *arg)
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{
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return __leaf_switch_none(1, fill);
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}
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static noinline __init int leaf_switch_2_none(unsigned long sp, bool fill,
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static noinline int leaf_switch_2_none(unsigned long sp, bool fill,
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uint64_t *arg)
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{
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return __leaf_switch_none(2, fill);
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@ -447,68 +406,56 @@ static noinline __init int leaf_switch_2_none(unsigned long sp, bool fill,
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* non-code areas (i.e. in a switch statement before the first "case").
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* https://bugs.llvm.org/show_bug.cgi?id=44916
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*/
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DEFINE_TEST_DRIVER(switch_1_none, uint64_t, SCALAR, XFAIL);
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DEFINE_TEST_DRIVER(switch_2_none, uint64_t, SCALAR, XFAIL);
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DEFINE_TEST_DRIVER(switch_1_none, uint64_t, SCALAR, ALWAYS_FAIL);
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DEFINE_TEST_DRIVER(switch_2_none, uint64_t, SCALAR, ALWAYS_FAIL);
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static int __init test_stackinit_init(void)
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{
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unsigned int failures = 0;
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#define KUNIT_test_scalars(init) \
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KUNIT_CASE(test_u8_ ## init), \
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KUNIT_CASE(test_u16_ ## init), \
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KUNIT_CASE(test_u32_ ## init), \
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KUNIT_CASE(test_u64_ ## init), \
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KUNIT_CASE(test_char_array_ ## init)
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#define test_scalars(init) do { \
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failures += test_u8_ ## init (); \
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failures += test_u16_ ## init (); \
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failures += test_u32_ ## init (); \
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failures += test_u64_ ## init (); \
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failures += test_char_array_ ## init (); \
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} while (0)
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#define test_structs(init) do { \
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failures += test_small_hole_ ## init (); \
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failures += test_big_hole_ ## init (); \
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failures += test_trailing_hole_ ## init (); \
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failures += test_packed_ ## init (); \
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||||
} while (0)
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||||
#define KUNIT_test_structs(init) \
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KUNIT_CASE(test_small_hole_ ## init), \
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||||
KUNIT_CASE(test_big_hole_ ## init), \
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||||
KUNIT_CASE(test_trailing_hole_ ## init),\
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||||
KUNIT_CASE(test_packed_ ## init) \
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||||
|
||||
static struct kunit_case stackinit_test_cases[] = {
|
||||
/* These are explicitly initialized and should always pass. */
|
||||
test_scalars(zero);
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||||
test_structs(zero);
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||||
KUNIT_test_scalars(zero),
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||||
KUNIT_test_structs(zero),
|
||||
/* Padding here appears to be accidentally always initialized? */
|
||||
test_structs(dynamic_partial);
|
||||
test_structs(assigned_dynamic_partial);
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||||
KUNIT_test_structs(dynamic_partial),
|
||||
KUNIT_test_structs(assigned_dynamic_partial),
|
||||
/* Padding initialization depends on compiler behaviors. */
|
||||
test_structs(static_partial);
|
||||
test_structs(static_all);
|
||||
test_structs(dynamic_all);
|
||||
test_structs(runtime_partial);
|
||||
test_structs(runtime_all);
|
||||
test_structs(assigned_static_partial);
|
||||
test_structs(assigned_static_all);
|
||||
test_structs(assigned_dynamic_all);
|
||||
KUNIT_test_structs(static_partial),
|
||||
KUNIT_test_structs(static_all),
|
||||
KUNIT_test_structs(dynamic_all),
|
||||
KUNIT_test_structs(runtime_partial),
|
||||
KUNIT_test_structs(runtime_all),
|
||||
KUNIT_test_structs(assigned_static_partial),
|
||||
KUNIT_test_structs(assigned_static_all),
|
||||
KUNIT_test_structs(assigned_dynamic_all),
|
||||
/* Everything fails this since it effectively performs a memcpy(). */
|
||||
test_structs(assigned_copy);
|
||||
|
||||
KUNIT_test_structs(assigned_copy),
|
||||
/* STRUCTLEAK_BYREF_ALL should cover everything from here down. */
|
||||
test_scalars(none);
|
||||
failures += test_switch_1_none();
|
||||
failures += test_switch_2_none();
|
||||
|
||||
KUNIT_test_scalars(none),
|
||||
KUNIT_CASE(test_switch_1_none),
|
||||
KUNIT_CASE(test_switch_2_none),
|
||||
/* STRUCTLEAK_BYREF should cover from here down. */
|
||||
test_structs(none);
|
||||
|
||||
KUNIT_test_structs(none),
|
||||
/* STRUCTLEAK will only cover this. */
|
||||
failures += test_user();
|
||||
KUNIT_CASE(test_user),
|
||||
{}
|
||||
};
|
||||
|
||||
if (failures == 0)
|
||||
pr_info("all tests passed!\n");
|
||||
else
|
||||
pr_err("failures: %u\n", failures);
|
||||
static struct kunit_suite stackinit_test_suite = {
|
||||
.name = "stackinit",
|
||||
.test_cases = stackinit_test_cases,
|
||||
};
|
||||
|
||||
return failures ? -EINVAL : 0;
|
||||
}
|
||||
module_init(test_stackinit_init);
|
||||
|
||||
static void __exit test_stackinit_exit(void)
|
||||
{ }
|
||||
module_exit(test_stackinit_exit);
|
||||
kunit_test_suites(&stackinit_test_suite);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user