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lib/test_stackinit: Add assigned initializers
Add whole-variable assignments of cast static initializers. These appear
to currently behave like the direct initializers, but best to check them
too. For example:
struct test_big_hole var;
var = (struct test_big_hole){
.one = arg->one,
.two= arg->two,
.three = arg->three,
.four = arg->four };
Additionally adds a test for whole-object assignment, which is expected
to fail since it usually falls back to a memcpy():
var = *arg;
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/lkml/CAK8P3a20SEoYCrp3jOK32oZc9OkiPv+1KTjNZ2GxLbHpY4WexQ@mail.gmail.com
Cc: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210723221933.3431999-4-keescook@chromium.org
This commit is contained in:
Kees Cook
parent
1e2cd3084f
commit
a8fc576d4a
@ -95,6 +95,10 @@ static bool range_contains(char *haystack_start, size_t haystack_size,
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return false;
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}
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/* Whether the test is expected to fail. */
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#define WANT_SUCCESS 0
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#define XFAIL 1
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#define DO_NOTHING_TYPE_SCALAR(var_type) var_type
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#define DO_NOTHING_TYPE_STRING(var_type) void
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#define DO_NOTHING_TYPE_STRUCT(var_type) void
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@ -120,34 +124,74 @@ static bool range_contains(char *haystack_start, size_t haystack_size,
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#define INIT_CLONE_STRING [FILL_SIZE_STRING]
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#define INIT_CLONE_STRUCT /**/
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#define INIT_SCALAR_none /**/
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#define INIT_SCALAR_zero = 0
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#define ZERO_CLONE_SCALAR(zero) memset(&(zero), 0x00, sizeof(zero))
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#define ZERO_CLONE_STRING(zero) memset(&(zero), 0x00, sizeof(zero))
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/*
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* For the struct, intentionally poison padding to see if it gets
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* copied out in direct assignments.
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* */
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#define ZERO_CLONE_STRUCT(zero) \
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do { \
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memset(&(zero), 0xFF, sizeof(zero)); \
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zero.one = 0; \
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zero.two = 0; \
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zero.three = 0; \
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zero.four = 0; \
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} while (0)
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#define INIT_STRING_none [FILL_SIZE_STRING] /**/
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#define INIT_STRING_zero [FILL_SIZE_STRING] = { }
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#define INIT_SCALAR_none(var_type) /**/
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#define INIT_SCALAR_zero(var_type) = 0
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#define INIT_STRUCT_none /**/
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#define INIT_STRUCT_zero = { }
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#define INIT_STRUCT_static_partial = { .two = 0, }
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#define INIT_STRUCT_static_all = { .one = 0, \
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.two = 0, \
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.three = 0, \
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.four = 0, \
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#define INIT_STRING_none(var_type) [FILL_SIZE_STRING] /**/
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#define INIT_STRING_zero(var_type) [FILL_SIZE_STRING] = { }
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#define INIT_STRUCT_none(var_type) /**/
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#define INIT_STRUCT_zero(var_type) = { }
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#define __static_partial { .two = 0, }
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#define __static_all { .one = 0, \
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.two = 0, \
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.three = 0, \
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.four = 0, \
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}
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#define INIT_STRUCT_dynamic_partial = { .two = arg->two, }
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#define INIT_STRUCT_dynamic_all = { .one = arg->one, \
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.two = arg->two, \
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.three = arg->three, \
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.four = arg->four, \
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#define __dynamic_partial { .two = arg->two, }
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#define __dynamic_all { .one = arg->one, \
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.two = arg->two, \
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.three = arg->three, \
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.four = arg->four, \
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}
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#define INIT_STRUCT_runtime_partial ; \
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var.two = 0
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#define INIT_STRUCT_runtime_all ; \
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var.one = 0; \
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#define __runtime_partial var.two = 0
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#define __runtime_all var.one = 0; \
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var.two = 0; \
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var.three = 0; \
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var.four = 0
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#define INIT_STRUCT_static_partial(var_type) \
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= __static_partial
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#define INIT_STRUCT_static_all(var_type) \
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= __static_all
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#define INIT_STRUCT_dynamic_partial(var_type) \
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= __dynamic_partial
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#define INIT_STRUCT_dynamic_all(var_type) \
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= __dynamic_all
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#define INIT_STRUCT_runtime_partial(var_type) \
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; __runtime_partial
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#define INIT_STRUCT_runtime_all(var_type) \
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; __runtime_all
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#define INIT_STRUCT_assigned_static_partial(var_type) \
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; var = (var_type)__static_partial
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#define INIT_STRUCT_assigned_static_all(var_type) \
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; var = (var_type)__static_all
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#define INIT_STRUCT_assigned_dynamic_partial(var_type) \
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; var = (var_type)__dynamic_partial
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#define INIT_STRUCT_assigned_dynamic_all(var_type) \
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; var = (var_type)__dynamic_all
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#define INIT_STRUCT_assigned_copy(var_type) \
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; var = *(arg)
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/*
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* @name: unique string name for the test
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* @var_type: type to be tested for zeroing initialization
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@ -167,7 +211,7 @@ static noinline __init int test_ ## name (void) \
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BUILD_BUG_ON(sizeof(zero) > MAX_VAR_SIZE); \
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\
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/* Fill clone type with zero for per-field init. */ \
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memset(&zero, 0x00, sizeof(zero)); \
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ZERO_CLONE_ ## which(zero); \
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/* Clear entire check buffer for 0xFF overlap test. */ \
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memset(check_buf, 0x00, sizeof(check_buf)); \
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/* Fill stack with 0xFF. */ \
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@ -210,7 +254,7 @@ static noinline __init int test_ ## name (void) \
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return (xfail) ? 0 : 1; \
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} \
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}
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#define DEFINE_TEST(name, var_type, which, init_level) \
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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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do_nothing_ ## name(var_type *ptr) \
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@ -226,7 +270,8 @@ static noinline __init int leaf_ ## name(unsigned long sp, \
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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 INIT_ ## which ## _ ## init_level; \
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var_type var \
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INIT_ ## which ## _ ## init_level(var_type); \
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\
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target_start = &var; \
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target_size = sizeof(var); \
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@ -252,7 +297,7 @@ static noinline __init int leaf_ ## name(unsigned long sp, \
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\
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return (int)buf[0] | (int)buf[sizeof(buf) - 1]; \
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} \
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DEFINE_TEST_DRIVER(name, var_type, which, 0)
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DEFINE_TEST_DRIVER(name, var_type, which, xfail)
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/* Structure with no padding. */
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struct test_packed {
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@ -296,42 +341,50 @@ struct test_user {
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unsigned long four;
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};
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#define DEFINE_SCALAR_TEST(name, init) \
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DEFINE_TEST(name ## _ ## init, name, SCALAR, init)
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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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#define DEFINE_SCALAR_TESTS(init) \
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DEFINE_SCALAR_TEST(u8, init); \
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DEFINE_SCALAR_TEST(u16, init); \
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DEFINE_SCALAR_TEST(u32, init); \
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DEFINE_SCALAR_TEST(u64, init); \
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DEFINE_TEST(char_array_ ## init, unsigned char, STRING, init)
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#define DEFINE_SCALAR_TESTS(init, xfail) \
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DEFINE_SCALAR_TEST(u8, init, xfail); \
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DEFINE_SCALAR_TEST(u16, init, xfail); \
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DEFINE_SCALAR_TEST(u32, init, xfail); \
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DEFINE_SCALAR_TEST(u64, init, xfail); \
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DEFINE_TEST(char_array_ ## init, unsigned char, \
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STRING, init, xfail)
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#define DEFINE_STRUCT_TEST(name, init) \
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#define DEFINE_STRUCT_TEST(name, init, xfail) \
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DEFINE_TEST(name ## _ ## init, \
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struct test_ ## name, STRUCT, init)
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struct test_ ## name, STRUCT, init, \
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xfail)
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#define DEFINE_STRUCT_TESTS(init) \
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DEFINE_STRUCT_TEST(small_hole, init); \
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DEFINE_STRUCT_TEST(big_hole, init); \
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DEFINE_STRUCT_TEST(trailing_hole, init); \
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DEFINE_STRUCT_TEST(packed, init)
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#define DEFINE_STRUCT_TESTS(init, xfail) \
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DEFINE_STRUCT_TEST(small_hole, init, xfail); \
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DEFINE_STRUCT_TEST(big_hole, init, xfail); \
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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_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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/* These should be fully initialized all the time! */
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DEFINE_SCALAR_TESTS(zero);
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DEFINE_STRUCT_TESTS(zero);
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/* Static initialization: padding may be left uninitialized. */
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DEFINE_STRUCT_TESTS(static_partial);
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DEFINE_STRUCT_TESTS(static_all);
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/* Dynamic initialization: padding may be left uninitialized. */
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DEFINE_STRUCT_TESTS(dynamic_partial);
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DEFINE_STRUCT_TESTS(dynamic_all);
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/* Runtime initialization: padding may be left uninitialized. */
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DEFINE_STRUCT_TESTS(runtime_partial);
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DEFINE_STRUCT_TESTS(runtime_all);
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DEFINE_SCALAR_TESTS(zero, WANT_SUCCESS);
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DEFINE_STRUCT_TESTS(zero, WANT_SUCCESS);
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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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/* No initialization without compiler instrumentation. */
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DEFINE_SCALAR_TESTS(none);
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DEFINE_STRUCT_TESTS(none);
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DEFINE_TEST(user, struct test_user, STRUCT, none);
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DEFINE_SCALAR_TESTS(none, WANT_SUCCESS);
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DEFINE_STRUCT_TESTS(none, WANT_SUCCESS);
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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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/*
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* Check two uses through a variable declaration outside either path,
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@ -394,8 +447,8 @@ 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, 1);
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DEFINE_TEST_DRIVER(switch_2_none, uint64_t, SCALAR, 1);
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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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static int __init test_stackinit_init(void)
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{
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@ -421,12 +474,18 @@ static int __init test_stackinit_init(void)
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test_structs(zero);
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/* Padding here appears to be accidentally always initialized? */
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test_structs(dynamic_partial);
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test_structs(assigned_dynamic_partial);
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/* Padding initialization depends on compiler behaviors. */
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test_structs(static_partial);
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test_structs(static_all);
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test_structs(dynamic_all);
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test_structs(runtime_partial);
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test_structs(runtime_all);
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test_structs(assigned_static_partial);
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test_structs(assigned_static_all);
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test_structs(assigned_dynamic_all);
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/* Everything fails this since it effectively performs a memcpy(). */
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test_structs(assigned_copy);
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/* STRUCTLEAK_BYREF_ALL should cover everything from here down. */
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test_scalars(none);
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