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Message-Id: <20210723221933.3431999-4-keescook@chromium.org>
Date: Fri, 23 Jul 2021 15:19:33 -0700
From: Kees Cook <keescook@...omium.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Kees Cook <keescook@...omium.org>,
Ard Biesheuvel <ardb@...nel.org>, linux-kernel@...r.kernel.org,
linux-hardening@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: [PATCH 3/3] 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@...db.de>
Link: https://lore.kernel.org/lkml/CAK8P3a20SEoYCrp3jOK32oZc9OkiPv+1KTjNZ2GxLbHpY4WexQ@mail.gmail.com
Cc: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
lib/test_stackinit.c | 169 +++++++++++++++++++++++++++++--------------
1 file changed, 114 insertions(+), 55 deletions(-)
diff --git a/lib/test_stackinit.c b/lib/test_stackinit.c
index e2713b639873..05f6dc8486c7 100644
--- a/lib/test_stackinit.c
+++ b/lib/test_stackinit.c
@@ -94,6 +94,10 @@ static bool range_contains(char *haystack_start, size_t haystack_size,
return false;
}
+/* Whether the test is expected to fail. */
+#define WANT_SUCCESS 0
+#define XFAIL 1
+
#define DO_NOTHING_TYPE_SCALAR(var_type) var_type
#define DO_NOTHING_TYPE_STRING(var_type) void
#define DO_NOTHING_TYPE_STRUCT(var_type) void
@@ -119,34 +123,74 @@ static bool range_contains(char *haystack_start, size_t haystack_size,
#define INIT_CLONE_STRING [FILL_SIZE_STRING]
#define INIT_CLONE_STRUCT /**/
-#define INIT_SCALAR_none /**/
-#define INIT_SCALAR_zero = 0
+#define ZERO_CLONE_SCALAR(zero) memset(&(zero), 0x00, sizeof(zero))
+#define ZERO_CLONE_STRING(zero) memset(&(zero), 0x00, sizeof(zero))
+/*
+ * For the struct, intentionally poison padding to see if it gets
+ * copied out in direct assignments.
+ * */
+#define ZERO_CLONE_STRUCT(zero) \
+ do { \
+ memset(&(zero), 0xFF, sizeof(zero)); \
+ zero.one = 0; \
+ zero.two = 0; \
+ zero.three = 0; \
+ zero.four = 0; \
+ } while (0)
+
+#define INIT_SCALAR_none(var_type) /**/
+#define INIT_SCALAR_zero(var_type) = 0
-#define INIT_STRING_none [FILL_SIZE_STRING] /**/
-#define INIT_STRING_zero [FILL_SIZE_STRING] = { }
+#define INIT_STRING_none(var_type) [FILL_SIZE_STRING] /**/
+#define INIT_STRING_zero(var_type) [FILL_SIZE_STRING] = { }
-#define INIT_STRUCT_none /**/
-#define INIT_STRUCT_zero = { }
-#define INIT_STRUCT_static_partial = { .two = 0, }
-#define INIT_STRUCT_static_all = { .one = 0, \
- .two = 0, \
- .three = 0, \
- .four = 0, \
+#define INIT_STRUCT_none(var_type) /**/
+#define INIT_STRUCT_zero(var_type) = { }
+
+
+#define __static_partial { .two = 0, }
+#define __static_all { .one = 0, \
+ .two = 0, \
+ .three = 0, \
+ .four = 0, \
}
-#define INIT_STRUCT_dynamic_partial = { .two = arg->two, }
-#define INIT_STRUCT_dynamic_all = { .one = arg->one, \
- .two = arg->two, \
- .three = arg->three, \
- .four = arg->four, \
+#define __dynamic_partial { .two = arg->two, }
+#define __dynamic_all { .one = arg->one, \
+ .two = arg->two, \
+ .three = arg->three, \
+ .four = arg->four, \
}
-#define INIT_STRUCT_runtime_partial ; \
- var.two = 0
-#define INIT_STRUCT_runtime_all ; \
- var.one = 0; \
+#define __runtime_partial var.two = 0
+#define __runtime_all var.one = 0; \
var.two = 0; \
var.three = 0; \
var.four = 0
+#define INIT_STRUCT_static_partial(var_type) \
+ = __static_partial
+#define INIT_STRUCT_static_all(var_type) \
+ = __static_all
+#define INIT_STRUCT_dynamic_partial(var_type) \
+ = __dynamic_partial
+#define INIT_STRUCT_dynamic_all(var_type) \
+ = __dynamic_all
+#define INIT_STRUCT_runtime_partial(var_type) \
+ ; __runtime_partial
+#define INIT_STRUCT_runtime_all(var_type) \
+ ; __runtime_all
+
+#define INIT_STRUCT_assigned_static_partial(var_type) \
+ ; var = (var_type)__static_partial
+#define INIT_STRUCT_assigned_static_all(var_type) \
+ ; var = (var_type)__static_all
+#define INIT_STRUCT_assigned_dynamic_partial(var_type) \
+ ; var = (var_type)__dynamic_partial
+#define INIT_STRUCT_assigned_dynamic_all(var_type) \
+ ; var = (var_type)__dynamic_all
+
+#define INIT_STRUCT_assigned_copy(var_type) \
+ ; var = *(arg)
+
/*
* @name: unique string name for the test
* @var_type: type to be tested for zeroing initialization
@@ -166,7 +210,7 @@ static noinline __init int test_ ## name (void) \
BUILD_BUG_ON(sizeof(zero) > MAX_VAR_SIZE); \
\
/* Fill clone type with zero for per-field init. */ \
- memset(&zero, 0x00, sizeof(zero)); \
+ ZERO_CLONE_ ## which(zero); \
/* Clear entire check buffer for 0xFF overlap test. */ \
memset(check_buf, 0x00, sizeof(check_buf)); \
/* Fill stack with 0xFF. */ \
@@ -209,7 +253,7 @@ static noinline __init int test_ ## name (void) \
return (xfail) ? 0 : 1; \
} \
}
-#define DEFINE_TEST(name, var_type, which, init_level) \
+#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) \
do_nothing_ ## name(var_type *ptr) \
@@ -225,7 +269,8 @@ static noinline __init int leaf_ ## name(unsigned long sp, \
var_type *arg) \
{ \
char buf[VAR_BUFFER]; \
- var_type var INIT_ ## which ## _ ## init_level; \
+ var_type var \
+ INIT_ ## which ## _ ## init_level(var_type); \
\
target_start = &var; \
target_size = sizeof(var); \
@@ -251,7 +296,7 @@ static noinline __init int leaf_ ## name(unsigned long sp, \
\
return (int)buf[0] | (int)buf[sizeof(buf) - 1]; \
} \
-DEFINE_TEST_DRIVER(name, var_type, which, 0)
+DEFINE_TEST_DRIVER(name, var_type, which, xfail)
/* Structure with no padding. */
struct test_packed {
@@ -295,42 +340,50 @@ struct test_user {
unsigned long four;
};
-#define DEFINE_SCALAR_TEST(name, init) \
- DEFINE_TEST(name ## _ ## init, name, SCALAR, init)
+#define DEFINE_SCALAR_TEST(name, init, xfail) \
+ DEFINE_TEST(name ## _ ## init, name, SCALAR, \
+ init, xfail)
-#define DEFINE_SCALAR_TESTS(init) \
- DEFINE_SCALAR_TEST(u8, init); \
- DEFINE_SCALAR_TEST(u16, init); \
- DEFINE_SCALAR_TEST(u32, init); \
- DEFINE_SCALAR_TEST(u64, init); \
- DEFINE_TEST(char_array_ ## init, unsigned char, STRING, init)
+#define DEFINE_SCALAR_TESTS(init, xfail) \
+ DEFINE_SCALAR_TEST(u8, init, xfail); \
+ DEFINE_SCALAR_TEST(u16, init, xfail); \
+ DEFINE_SCALAR_TEST(u32, init, xfail); \
+ DEFINE_SCALAR_TEST(u64, init, xfail); \
+ DEFINE_TEST(char_array_ ## init, unsigned char, \
+ STRING, init, xfail)
-#define DEFINE_STRUCT_TEST(name, init) \
+#define DEFINE_STRUCT_TEST(name, init, xfail) \
DEFINE_TEST(name ## _ ## init, \
- struct test_ ## name, STRUCT, init)
+ struct test_ ## name, STRUCT, init, \
+ xfail)
+
+#define DEFINE_STRUCT_TESTS(init, xfail) \
+ DEFINE_STRUCT_TEST(small_hole, init, xfail); \
+ DEFINE_STRUCT_TEST(big_hole, init, xfail); \
+ DEFINE_STRUCT_TEST(trailing_hole, init, xfail); \
+ DEFINE_STRUCT_TEST(packed, init, xfail)
-#define DEFINE_STRUCT_TESTS(init) \
- DEFINE_STRUCT_TEST(small_hole, init); \
- DEFINE_STRUCT_TEST(big_hole, init); \
- DEFINE_STRUCT_TEST(trailing_hole, init); \
- DEFINE_STRUCT_TEST(packed, init)
+#define DEFINE_STRUCT_INITIALIZER_TESTS(base) \
+ DEFINE_STRUCT_TESTS(base ## _ ## partial, \
+ WANT_SUCCESS); \
+ DEFINE_STRUCT_TESTS(base ## _ ## all, \
+ WANT_SUCCESS)
/* These should be fully initialized all the time! */
-DEFINE_SCALAR_TESTS(zero);
-DEFINE_STRUCT_TESTS(zero);
-/* Static initialization: padding may be left uninitialized. */
-DEFINE_STRUCT_TESTS(static_partial);
-DEFINE_STRUCT_TESTS(static_all);
-/* Dynamic initialization: padding may be left uninitialized. */
-DEFINE_STRUCT_TESTS(dynamic_partial);
-DEFINE_STRUCT_TESTS(dynamic_all);
-/* Runtime initialization: padding may be left uninitialized. */
-DEFINE_STRUCT_TESTS(runtime_partial);
-DEFINE_STRUCT_TESTS(runtime_all);
+DEFINE_SCALAR_TESTS(zero, WANT_SUCCESS);
+DEFINE_STRUCT_TESTS(zero, WANT_SUCCESS);
+/* Struct initializers: padding may be left uninitialized. */
+DEFINE_STRUCT_INITIALIZER_TESTS(static);
+DEFINE_STRUCT_INITIALIZER_TESTS(dynamic);
+DEFINE_STRUCT_INITIALIZER_TESTS(runtime);
+DEFINE_STRUCT_INITIALIZER_TESTS(assigned_static);
+DEFINE_STRUCT_INITIALIZER_TESTS(assigned_dynamic);
+DEFINE_STRUCT_TESTS(assigned_copy, XFAIL);
/* No initialization without compiler instrumentation. */
-DEFINE_SCALAR_TESTS(none);
-DEFINE_STRUCT_TESTS(none);
-DEFINE_TEST(user, struct test_user, STRUCT, none);
+DEFINE_SCALAR_TESTS(none, WANT_SUCCESS);
+DEFINE_STRUCT_TESTS(none, WANT_SUCCESS);
+/* Initialization of members with __user attribute. */
+DEFINE_TEST(user, struct test_user, STRUCT, none, WANT_SUCCESS);
/*
* Check two uses through a variable declaration outside either path,
@@ -393,8 +446,8 @@ static noinline __init int leaf_switch_2_none(unsigned long sp, bool fill,
* non-code areas (i.e. in a switch statement before the first "case").
* https://bugs.llvm.org/show_bug.cgi?id=44916
*/
-DEFINE_TEST_DRIVER(switch_1_none, uint64_t, SCALAR, 1);
-DEFINE_TEST_DRIVER(switch_2_none, uint64_t, SCALAR, 1);
+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)
{
@@ -420,12 +473,18 @@ static int __init test_stackinit_init(void)
test_structs(zero);
/* Padding here appears to be accidentally always initialized? */
test_structs(dynamic_partial);
+ 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);
+ /* Everything fails this since it effectively performs a memcpy(). */
+ test_structs(assigned_copy);
/* STRUCTLEAK_BYREF_ALL should cover everything from here down. */
test_scalars(none);
--
2.30.2
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