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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id h7sm1631017pfi.128.2022.02.23.21.51.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Feb 2022 21:51:50 -0800 (PST) From: Kees Cook To: David Gow Cc: Kees Cook , Daniel Latypov , Arnd Bergmann , Nathan Chancellor , Nick Desaulniers , linux-kernel@vger.kernel.org, KUnit Development , llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: [PATCH] lib: stackinit: Convert to KUnit Date: Wed, 23 Feb 2022 21:51:45 -0800 Message-Id: <20220224055145.1853657-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=18875; h=from:subject; bh=sQRRbxC2wQHKsdqLZkkKVYTj8xOlF68e/7m0dcGgcAk=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBiFxzx4WFvDH4fan7k6u/tKd6C7zWg6tgBgrx06Hil Ge/wcmmJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYhcc8QAKCRCJcvTf3G3AJuAxD/ 0WCHcH2w2UvY0Ur2uoEGKsyaldv3JxfscUsQeQ3ervs7ZOkZ7QkPOuAZAFB6KJa8UuULbR0zDmWraR gva24JeTka+ZVvywA6TsqqQ7wgUkuhxhNm0KzqyR5BZbA1CV/MMCBNADeIqcBocmlSshOobZ9H83ur L7K8oqJWmu6++hVZW22wq004lQQxPX8sGecAxAF23EuhmvHs9OqQx0/GW3R0pbS7U0EtZj526LaoZv YMCzfJFBTCIXpm/Pge7XjpK+nwWiiBWfhyErj3aRzRajMQs99SmiTd3Qggr8vBwoC9vplTp8DpxpLM TSVaAksAOiNIEnrHkAmTUkxJL0tpu6fkmI4ZmPYE3Co3+OvdeZErXsVw1GQIGU2RAf7LepkQsg4ULU Q1VnWeaa0x1ayN0Rro0ZswxzY2l8RlNgnQp7XCbmezXzQJXzBaOlfUuI+UHRZQrdrBiivO4ADP/9/7 Hu60bslQRv5kAG1MsQpDF31tvUIPX9NI5VhKatYAK4anVI0xHRKn9NCN4y7y7DQugCarN1Ok63EdWw FnyszicvaWAeIcbycZo3di/FIOhcSMVUitCtsloXEXCpfQuqTuH91Vs16WHYc1XL25TEKz0aGM1oIm 67AQu21aduPgUPzb2o6y3K797ceLErFV+1Ar/q9wJTAPmj15zQRS77dSRf5g== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Convert to running under Kunit (and retain being able to run stand-alone too). Building under Clang (or GCC 12) with CONFIG_INIT_STACK_ALL_ZERO=y, this now passes as expected: $ ./tools/testing/kunit/kunit.py config --make_option LLVM=1 $ ./tools/testing/kunit/kunit.py run overflow --make_option LLVM=1 \ --kconfig_add CONFIG_INIT_STACK_ALL_ZERO=y ... [09:47:28] ================= stackinit (65 subtests) ================== [09:47:28] [PASSED] test_u8_zero [09:47:28] [PASSED] test_u16_zero [09:47:28] [PASSED] test_u32_zero [09:47:28] [PASSED] test_u64_zero [09:47:28] [PASSED] test_char_array_zero [09:47:28] [PASSED] test_small_hole_zero [09:47:28] [PASSED] test_big_hole_zero [09:47:28] [PASSED] test_trailing_hole_zero [09:47:28] [PASSED] test_packed_zero [09:47:28] [PASSED] test_small_hole_dynamic_partial [09:47:28] [PASSED] test_big_hole_dynamic_partial [09:47:28] [PASSED] test_trailing_hole_dynamic_partial [09:47:28] [PASSED] test_packed_dynamic_partial [09:47:28] [PASSED] test_small_hole_assigned_dynamic_partial [09:47:28] [PASSED] test_big_hole_assigned_dynamic_partial [09:47:28] [PASSED] test_trailing_hole_assigned_dynamic_partial [09:47:28] [PASSED] test_packed_assigned_dynamic_partial [09:47:28] [PASSED] test_small_hole_static_partial [09:47:28] [PASSED] test_big_hole_static_partial [09:47:28] [PASSED] test_trailing_hole_static_partial [09:47:28] [PASSED] test_packed_static_partial [09:47:28] [PASSED] test_small_hole_static_all [09:47:28] [PASSED] test_big_hole_static_all [09:47:28] [PASSED] test_trailing_hole_static_all [09:47:28] [PASSED] test_packed_static_all [09:47:28] [PASSED] test_small_hole_dynamic_all [09:47:28] [PASSED] test_big_hole_dynamic_all [09:47:28] [PASSED] test_trailing_hole_dynamic_all [09:47:28] [PASSED] test_packed_dynamic_all [09:47:28] [PASSED] test_small_hole_runtime_partial [09:47:28] [PASSED] test_big_hole_runtime_partial [09:47:28] [PASSED] test_trailing_hole_runtime_partial [09:47:28] [PASSED] test_packed_runtime_partial [09:47:28] [PASSED] test_small_hole_runtime_all [09:47:28] [PASSED] test_big_hole_runtime_all [09:47:28] [PASSED] test_trailing_hole_runtime_all [09:47:28] [PASSED] test_packed_runtime_all [09:47:28] [PASSED] test_small_hole_assigned_static_partial [09:47:28] [PASSED] test_big_hole_assigned_static_partial [09:47:28] [PASSED] test_trailing_hole_assigned_static_partial [09:47:28] [PASSED] test_packed_assigned_static_partial [09:47:28] [PASSED] test_small_hole_assigned_static_all [09:47:28] [PASSED] test_big_hole_assigned_static_all [09:47:28] [PASSED] test_trailing_hole_assigned_static_all [09:47:28] [PASSED] test_packed_assigned_static_all [09:47:28] [PASSED] test_small_hole_assigned_dynamic_all [09:47:28] [PASSED] test_big_hole_assigned_dynamic_all [09:47:28] [PASSED] test_trailing_hole_assigned_dynamic_all [09:47:28] [PASSED] test_packed_assigned_dynamic_all [09:47:28] [SKIPPED] test_small_hole_assigned_copy [09:47:28] [SKIPPED] test_big_hole_assigned_copy [09:47:28] [SKIPPED] test_trailing_hole_assigned_copy [09:47:28] [PASSED] test_packed_assigned_copy [09:47:28] [PASSED] test_u8_none [09:47:28] [PASSED] test_u16_none [09:47:28] [PASSED] test_u32_none [09:47:28] [PASSED] test_u64_none [09:47:28] [PASSED] test_char_array_none [09:47:28] [SKIPPED] test_switch_1_none [09:47:28] [SKIPPED] test_switch_2_none [09:47:28] [PASSED] test_small_hole_none [09:47:28] [PASSED] test_big_hole_none [09:47:28] [PASSED] test_trailing_hole_none [09:47:28] [PASSED] test_packed_none [09:47:28] [PASSED] test_user [09:47:28] ==================== [PASSED] stackinit ==================== [09:47:28] ============================================================ [09:47:28] Testing complete. Passed: 60, Failed: 0, Crashed: 0, Skipped: 5, Errors: 0 [09:47:28] Elapsed time: 4.192s total, 0.001s configuring, 4.070s building, 0.102s running Cc: David Gow Cc: Daniel Latypov Cc: Arnd Bergmann Signed-off-by: Kees Cook --- lib/Kconfig.debug | 26 +- lib/Makefile | 4 +- lib/{test_stackinit.c => stackinit_kunit.c} | 249 ++++++++++++-------- 3 files changed, 168 insertions(+), 111 deletions(-) rename lib/{test_stackinit.c => stackinit_kunit.c} (73%) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 14d90d03bc8d..ea4415275563 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2511,6 +2511,21 @@ config OVERFLOW_KUNIT_TEST If unsure, say N. +config STACKINIT_KUNIT_TEST + tristate "Test level of stack variable initialization" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + help + Test if the kernel is zero-initializing stack variables and + padding. Coverage is controlled by compiler flags, + CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF, + or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL. + + 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 TEST_UDELAY tristate "udelay test driver" help @@ -2602,17 +2617,6 @@ config TEST_OBJAGG Enable this option to test object aggregation manager on boot (or module load). - -config TEST_STACKINIT - tristate "Test level of stack variable initialization" - help - Test if the kernel is zero-initializing stack variables and - padding. Coverage is controlled by compiler flags, - CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF, - or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL. - - If unsure, say N. - config TEST_MEMINIT tristate "Test heap/page initialization" help diff --git a/lib/Makefile b/lib/Makefile index fdfcbfaff32f..353bc09ce38d 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -93,8 +93,6 @@ obj-$(CONFIG_TEST_KMOD) += test_kmod.o obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o obj-$(CONFIG_TEST_MEMCAT_P) += test_memcat_p.o obj-$(CONFIG_TEST_OBJAGG) += test_objagg.o -CFLAGS_test_stackinit.o += $(call cc-disable-warning, switch-unreachable) -obj-$(CONFIG_TEST_STACKINIT) += test_stackinit.o obj-$(CONFIG_TEST_BLACKHOLE_DEV) += test_blackhole_dev.o obj-$(CONFIG_TEST_MEMINIT) += test_meminit.o obj-$(CONFIG_TEST_LOCKUP) += test_lockup.o @@ -363,6 +361,8 @@ obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o +CFLAGS_stackinit_kunit.o += $(call cc-disable-warning, switch-unreachable) +obj-$(CONFIG_STACKINIT_KUNIT_TEST) += stackinit_kunit.o obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o diff --git a/lib/test_stackinit.c b/lib/stackinit_kunit.c similarity index 73% rename from lib/test_stackinit.c rename to lib/stackinit_kunit.c index a3c74e6a21ff..72c7d4cb8ed2 100644 --- a/lib/test_stackinit.c +++ b/lib/stackinit_kunit.c @@ -2,14 +2,23 @@ /* * Test cases for compiler-based stack variable zeroing via * -ftrivial-auto-var-init={zero,pattern} or CONFIG_GCC_PLUGIN_STRUCTLEAK*. + * For example, see: + * https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests + * ./tools/testing/kunit/kunit.py config --make_option LLVM=1 + * ./tools/testing/kunit/kunit.py run overflow [--raw_output] \ + * --make_option LLVM=1 \ + * --kconfig_add CONFIG_INIT_STACK_ALL_ZERO=y * * External build example: * clang -O2 -Wall -ftrivial-auto-var-init=pattern \ - * -o test_stackinit test_stackinit.c + * -o stackinit_kunit stackinit_kunit.c + * ./stackinit_kunit + * */ #ifdef __KERNEL__ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include #include #include #include @@ -18,21 +27,55 @@ #else /* Userspace headers. */ +#define _GNU_SOURCE #include #include +#include #include #include #include #include /* Linux kernel-ism stubs for stand-alone userspace build. */ -#define KBUILD_MODNAME "stackinit" -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt -#define pr_err(fmt, ...) fprintf(stderr, pr_fmt(fmt), ##__VA_ARGS__) -#define pr_warn(fmt, ...) fprintf(stderr, pr_fmt(fmt), ##__VA_ARGS__) -#define pr_info(fmt, ...) fprintf(stdout, pr_fmt(fmt), ##__VA_ARGS__) -#define __init /**/ -#define __exit /**/ +#define TEST_PASS 0 +#define TEST_SKIP 1 +#define TEST_FAIL 2 +struct kunit { + int status; + char *msg; +}; +struct kunit_case { + void (*run_case)(struct kunit *test); + const char *name; +}; +struct kunit_suite { + const char *name; + const struct kunit_case *test_cases; +}; +#define KUNIT_CASE(test_name) { .run_case = test_name, .name = #test_name } + +#define KUNIT_ASSERT_TRUE_MSG(test, expr, fmt, ...) \ +do { \ + if (!(expr)) { \ + if (test->status != TEST_SKIP) \ + test->status = TEST_FAIL; \ + if (test->msg) \ + free(test->msg); \ + asprintf(&test->msg, fmt, ##__VA_ARGS__); \ + } \ +} while (0) + +#define KUNIT_ASSERT_EQ_MSG(test, left, right, fmt, ...) \ + KUNIT_ASSERT_TRUE_MSG(test, (left) == (right), fmt, ##__VA_ARGS__) + +#define kunit_skip(test, fmt, ...) \ +do { \ + test->status = TEST_SKIP; \ + if (test->msg) \ + free(test->msg); \ + asprintf(&test->msg, fmt, ##__VA_ARGS__); \ +} while (0) + #define __user /**/ #define noinline __attribute__((__noinline__)) #define __aligned(x) __attribute__((__aligned__(x))) @@ -59,16 +102,44 @@ typedef uint16_t u16; typedef uint32_t u32; typedef uint64_t u64; -#define module_init(func) static int (*do_init)(void) = func -#define module_exit(func) static void (*do_exit)(void) = func -#define MODULE_LICENSE(str) int main(void) { \ - int rc; \ - /* License: str */ \ - rc = do_init(); \ - if (rc == 0) \ - do_exit(); \ - return rc; \ - } +#define MODULE_LICENSE(str) /* */ + +int do_kunit_test_suite(struct kunit_suite *suite) +{ + const struct kunit_case *test_case; + int rc = 0; + + for (test_case = suite->test_cases; test_case->run_case; test_case++) { + struct kunit test = { }; + + test_case->run_case(&test); + switch (test.status) { + default: + case TEST_FAIL: + fprintf(stderr, "FAIL: %s%s%s", test_case->name, + test.msg ? ": " : "", + test.msg ?: "\n"); + rc = 1; + break; + case TEST_SKIP: + fprintf(stdout, "XFAIL: %s%s%s", test_case->name, + test.msg ? ": " : "", + test.msg ?: "\n"); + break; + case TEST_PASS: + fprintf(stdout, "ok: %s\n", test_case->name); + break; + } + if (test.msg) + free(test.msg); + } + return rc; +} + +#define kunit_test_suite(suite) \ +int main(void) { \ + return do_kunit_test_suite(&(suite)); \ +} #endif /* __KERNEL__ */ @@ -201,7 +272,7 @@ static bool range_contains(char *haystack_start, size_t haystack_size, */ #define DEFINE_TEST_DRIVER(name, var_type, which, xfail) \ /* Returns 0 on success, 1 on failure. */ \ -static noinline __init int test_ ## name (void) \ +static noinline void test_ ## name (struct kunit *test) \ { \ var_type zero INIT_CLONE_ ## which; \ int ignored; \ @@ -220,10 +291,8 @@ static noinline __init int test_ ## name (void) \ /* Verify all bytes overwritten with 0xFF. */ \ for (sum = 0, i = 0; i < target_size; i++) \ sum += (check_buf[i] != 0xFF); \ - if (sum) { \ - pr_err(#name ": leaf fill was not 0xFF!?\n"); \ - return 1; \ - } \ + KUNIT_ASSERT_EQ_MSG(test, sum, 0, \ + "leaf fill was not 0xFF!?\n"); \ /* Clear entire check buffer for later bit tests. */ \ memset(check_buf, 0x00, sizeof(check_buf)); \ /* Extract stack-defined variable contents. */ \ @@ -231,32 +300,29 @@ static noinline __init int test_ ## name (void) \ FETCH_ARG_ ## which(zero)); \ \ /* Validate that compiler lined up fill and target. */ \ - if (!range_contains(fill_start, fill_size, \ - target_start, target_size)) { \ - pr_err(#name ": stack fill missed target!?\n"); \ - pr_err(#name ": fill %zu wide\n", fill_size); \ - pr_err(#name ": target offset by %d\n", \ - (int)((ssize_t)(uintptr_t)fill_start - \ - (ssize_t)(uintptr_t)target_start)); \ - return 1; \ - } \ + KUNIT_ASSERT_TRUE_MSG(test, \ + range_contains(fill_start, fill_size, \ + target_start, target_size), \ + "stack fill missed target!? " \ + "(fill %zu wide, target offset by %d)\n", \ + fill_size, \ + (int)((ssize_t)(uintptr_t)fill_start - \ + (ssize_t)(uintptr_t)target_start)); \ \ /* Look for any bytes still 0xFF in check region. */ \ for (sum = 0, i = 0; i < target_size; i++) \ sum += (check_buf[i] == 0xFF); \ \ - if (sum == 0) { \ - pr_info(#name " ok\n"); \ - return 0; \ - } else { \ - pr_warn(#name " %sFAIL (uninit bytes: %d)\n", \ - (xfail) ? "X" : "", sum); \ - return (xfail) ? 0 : 1; \ - } \ + if (sum != 0 && xfail) \ + kunit_skip(test, \ + "XFAIL uninit bytes: %d\n", \ + sum); \ + KUNIT_ASSERT_EQ_MSG(test, sum, 0, \ + "uninit bytes: %d\n", sum); \ } #define DEFINE_TEST(name, var_type, which, init_level, xfail) \ /* no-op to force compiler into ignoring "uninitialized" vars */\ -static noinline __init DO_NOTHING_TYPE_ ## which(var_type) \ +static noinline DO_NOTHING_TYPE_ ## which(var_type) \ do_nothing_ ## name(var_type *ptr) \ { \ /* Will always be true, but compiler doesn't know. */ \ @@ -265,9 +331,8 @@ do_nothing_ ## name(var_type *ptr) \ else \ return DO_NOTHING_RETURN_ ## which(ptr + 1); \ } \ -static noinline __init int leaf_ ## name(unsigned long sp, \ - bool fill, \ - var_type *arg) \ +static noinline int leaf_ ## name(unsigned long sp, bool fill, \ + var_type *arg) \ { \ char buf[VAR_BUFFER]; \ var_type var \ @@ -398,7 +463,7 @@ static int noinline __leaf_switch_none(int path, bool fill) * This is intentionally unreachable. To silence the * warning, build with -Wno-switch-unreachable */ - uint64_t var; + uint64_t var[10]; case 1: target_start = &var; @@ -423,19 +488,19 @@ static int noinline __leaf_switch_none(int path, bool fill) memcpy(check_buf, target_start, target_size); break; default: - var = 5; - return var & forced_mask; + var[1] = 5; + return var[1] & forced_mask; } return 0; } -static noinline __init int leaf_switch_1_none(unsigned long sp, bool fill, +static noinline int leaf_switch_1_none(unsigned long sp, bool fill, uint64_t *arg) { return __leaf_switch_none(1, fill); } -static noinline __init int leaf_switch_2_none(unsigned long sp, bool fill, +static noinline int leaf_switch_2_none(unsigned long sp, bool fill, uint64_t *arg) { return __leaf_switch_none(2, fill); @@ -450,65 +515,53 @@ static noinline __init int leaf_switch_2_none(unsigned long sp, bool fill, DEFINE_TEST_DRIVER(switch_1_none, uint64_t, SCALAR, XFAIL); DEFINE_TEST_DRIVER(switch_2_none, uint64_t, SCALAR, XFAIL); -static int __init test_stackinit_init(void) -{ - unsigned int failures = 0; - -#define test_scalars(init) do { \ - failures += test_u8_ ## init (); \ - failures += test_u16_ ## init (); \ - failures += test_u32_ ## init (); \ - failures += test_u64_ ## init (); \ - failures += test_char_array_ ## init (); \ - } while (0) +#define KUNIT_test_scalars(init) \ + KUNIT_CASE(test_u8_ ## init), \ + KUNIT_CASE(test_u16_ ## init), \ + KUNIT_CASE(test_u32_ ## init), \ + KUNIT_CASE(test_u64_ ## init), \ + KUNIT_CASE(test_char_array_ ## init) -#define test_structs(init) do { \ - failures += test_small_hole_ ## init (); \ - failures += test_big_hole_ ## init (); \ - failures += test_trailing_hole_ ## init (); \ - failures += test_packed_ ## init (); \ - } while (0) +#define KUNIT_test_structs(init) \ + KUNIT_CASE(test_small_hole_ ## init), \ + KUNIT_CASE(test_big_hole_ ## init), \ + KUNIT_CASE(test_trailing_hole_ ## init),\ + KUNIT_CASE(test_packed_ ## init) \ +static struct kunit_case stackinit_test_cases[] = { /* These are explicitly initialized and should always pass. */ - test_scalars(zero); - test_structs(zero); + KUNIT_test_scalars(zero), + KUNIT_test_structs(zero), /* Padding here appears to be accidentally always initialized? */ - test_structs(dynamic_partial); - test_structs(assigned_dynamic_partial); + 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(); - - if (failures == 0) - pr_info("all tests passed!\n"); - else - pr_err("failures: %u\n", failures); + KUNIT_CASE(test_user), + {} +}; - return failures ? -EINVAL : 0; -} -module_init(test_stackinit_init); +static struct kunit_suite stackinit_test_suite = { + .name = "stackinit", + .test_cases = stackinit_test_cases, +}; -static void __exit test_stackinit_exit(void) -{ } -module_exit(test_stackinit_exit); +kunit_test_suite(stackinit_test_suite); MODULE_LICENSE("GPL"); -- 2.30.2