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9124a26401
Validate the effect of the __alloc_size attribute on allocators. If the
compiler doesn't support __builtin_dynamic_object_size(), skip the
associated tests.
(For GCC, just remove the "--make_options" line below...)
$ ./tools/testing/kunit/kunit.py run --arch x86_64 \
--kconfig_add CONFIG_FORTIFY_SOURCE=y \
--make_options LLVM=1
fortify
...
[15:16:30] ================== fortify (10 subtests) ===================
[15:16:30] [PASSED] known_sizes_test
[15:16:30] [PASSED] control_flow_split_test
[15:16:30] [PASSED] alloc_size_kmalloc_const_test
[15:16:30] [PASSED] alloc_size_kmalloc_dynamic_test
[15:16:30] [PASSED] alloc_size_vmalloc_const_test
[15:16:30] [PASSED] alloc_size_vmalloc_dynamic_test
[15:16:30] [PASSED] alloc_size_kvmalloc_const_test
[15:16:30] [PASSED] alloc_size_kvmalloc_dynamic_test
[15:16:30] [PASSED] alloc_size_devm_kmalloc_const_test
[15:16:30] [PASSED] alloc_size_devm_kmalloc_dynamic_test
[15:16:30] ===================== [PASSED] fortify =====================
[15:16:30] ============================================================
[15:16:30] Testing complete. Ran 10 tests: passed: 10
[15:16:31] Elapsed time: 8.348s total, 0.002s configuring, 6.923s building, 1.075s running
For earlier GCC prior to version 12, the dynamic tests will be skipped:
[15:18:59] ================== fortify (10 subtests) ===================
[15:18:59] [PASSED] known_sizes_test
[15:18:59] [PASSED] control_flow_split_test
[15:18:59] [PASSED] alloc_size_kmalloc_const_test
[15:18:59] [SKIPPED] alloc_size_kmalloc_dynamic_test
[15:18:59] [PASSED] alloc_size_vmalloc_const_test
[15:18:59] [SKIPPED] alloc_size_vmalloc_dynamic_test
[15:18:59] [PASSED] alloc_size_kvmalloc_const_test
[15:18:59] [SKIPPED] alloc_size_kvmalloc_dynamic_test
[15:18:59] [PASSED] alloc_size_devm_kmalloc_const_test
[15:18:59] [SKIPPED] alloc_size_devm_kmalloc_dynamic_test
[15:18:59] ===================== [PASSED] fortify =====================
[15:18:59] ============================================================
[15:18:59] Testing complete. Ran 10 tests: passed: 6, skipped: 4
[15:18:59] Elapsed time: 11.965s total, 0.002s configuring, 10.540s building, 1.068s running
Cc: David Gow <davidgow@google.com>
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
331 lines
11 KiB
C
331 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Runtime test cases for CONFIG_FORTIFY_SOURCE that aren't expected to
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* Oops the kernel on success. (For those, see drivers/misc/lkdtm/fortify.c)
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*
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* For corner cases with UBSAN, try testing with:
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*
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* ./tools/testing/kunit/kunit.py run --arch=x86_64 \
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* --kconfig_add CONFIG_FORTIFY_SOURCE=y \
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* --kconfig_add CONFIG_UBSAN=y \
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* --kconfig_add CONFIG_UBSAN_TRAP=y \
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* --kconfig_add CONFIG_UBSAN_BOUNDS=y \
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* --kconfig_add CONFIG_UBSAN_LOCAL_BOUNDS=y \
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* --make_options LLVM=1 fortify
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*/
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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/device.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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static const char array_of_10[] = "this is 10";
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static const char *ptr_of_11 = "this is 11!";
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static char array_unknown[] = "compiler thinks I might change";
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static void known_sizes_test(struct kunit *test)
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{
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KUNIT_EXPECT_EQ(test, __compiletime_strlen("88888888"), 8);
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KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_of_10), 10);
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KUNIT_EXPECT_EQ(test, __compiletime_strlen(ptr_of_11), 11);
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KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_unknown), SIZE_MAX);
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/* Externally defined and dynamically sized string pointer: */
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KUNIT_EXPECT_EQ(test, __compiletime_strlen(test->name), SIZE_MAX);
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}
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/* This is volatile so the optimizer can't perform DCE below. */
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static volatile int pick;
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/* Not inline to keep optimizer from figuring out which string we want. */
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static noinline size_t want_minus_one(int pick)
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{
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const char *str;
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switch (pick) {
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case 1:
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str = "4444";
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break;
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case 2:
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str = "333";
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break;
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default:
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str = "1";
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break;
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}
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return __compiletime_strlen(str);
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}
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static void control_flow_split_test(struct kunit *test)
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{
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KUNIT_EXPECT_EQ(test, want_minus_one(pick), SIZE_MAX);
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}
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#define KUNIT_EXPECT_BOS(test, p, expected, name) \
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KUNIT_EXPECT_EQ_MSG(test, __builtin_object_size(p, 1), \
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expected, \
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"__alloc_size() not working with __bos on " name "\n")
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#if !__has_builtin(__builtin_dynamic_object_size)
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#define KUNIT_EXPECT_BDOS(test, p, expected, name) \
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/* Silence "unused variable 'expected'" warning. */ \
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KUNIT_EXPECT_EQ(test, expected, expected)
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#else
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#define KUNIT_EXPECT_BDOS(test, p, expected, name) \
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KUNIT_EXPECT_EQ_MSG(test, __builtin_dynamic_object_size(p, 1), \
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expected, \
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"__alloc_size() not working with __bdos on " name "\n")
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#endif
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/* If the execpted size is a constant value, __bos can see it. */
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#define check_const(_expected, alloc, free) do { \
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size_t expected = (_expected); \
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void *p = alloc; \
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KUNIT_EXPECT_TRUE_MSG(test, p != NULL, #alloc " failed?!\n"); \
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KUNIT_EXPECT_BOS(test, p, expected, #alloc); \
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KUNIT_EXPECT_BDOS(test, p, expected, #alloc); \
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free; \
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} while (0)
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/* If the execpted size is NOT a constant value, __bos CANNOT see it. */
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#define check_dynamic(_expected, alloc, free) do { \
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size_t expected = (_expected); \
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void *p = alloc; \
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KUNIT_EXPECT_TRUE_MSG(test, p != NULL, #alloc " failed?!\n"); \
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KUNIT_EXPECT_BOS(test, p, SIZE_MAX, #alloc); \
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KUNIT_EXPECT_BDOS(test, p, expected, #alloc); \
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free; \
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} while (0)
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/* Assortment of constant-value kinda-edge cases. */
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#define CONST_TEST_BODY(TEST_alloc) do { \
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/* Special-case vmalloc()-family to skip 0-sized allocs. */ \
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if (strcmp(#TEST_alloc, "TEST_vmalloc") != 0) \
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TEST_alloc(check_const, 0, 0); \
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TEST_alloc(check_const, 1, 1); \
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TEST_alloc(check_const, 128, 128); \
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TEST_alloc(check_const, 1023, 1023); \
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TEST_alloc(check_const, 1025, 1025); \
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TEST_alloc(check_const, 4096, 4096); \
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TEST_alloc(check_const, 4097, 4097); \
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} while (0)
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static volatile size_t zero_size;
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static volatile size_t unknown_size = 50;
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#if !__has_builtin(__builtin_dynamic_object_size)
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#define DYNAMIC_TEST_BODY(TEST_alloc) \
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kunit_skip(test, "Compiler is missing __builtin_dynamic_object_size() support\n")
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#else
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#define DYNAMIC_TEST_BODY(TEST_alloc) do { \
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size_t size = unknown_size; \
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\
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/* \
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* Expected size is "size" in each test, before it is then \
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* internally incremented in each test. Requires we disable \
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* -Wunsequenced. \
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*/ \
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TEST_alloc(check_dynamic, size, size++); \
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/* Make sure incrementing actually happened. */ \
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KUNIT_EXPECT_NE(test, size, unknown_size); \
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} while (0)
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#endif
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#define DEFINE_ALLOC_SIZE_TEST_PAIR(allocator) \
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static void alloc_size_##allocator##_const_test(struct kunit *test) \
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{ \
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CONST_TEST_BODY(TEST_##allocator); \
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} \
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static void alloc_size_##allocator##_dynamic_test(struct kunit *test) \
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{ \
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DYNAMIC_TEST_BODY(TEST_##allocator); \
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}
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#define TEST_kmalloc(checker, expected_size, alloc_size) do { \
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gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \
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void *orig; \
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size_t len; \
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\
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checker(expected_size, kmalloc(alloc_size, gfp), \
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kfree(p)); \
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checker(expected_size, \
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kmalloc_node(alloc_size, gfp, NUMA_NO_NODE), \
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kfree(p)); \
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checker(expected_size, kzalloc(alloc_size, gfp), \
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kfree(p)); \
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checker(expected_size, \
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kzalloc_node(alloc_size, gfp, NUMA_NO_NODE), \
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kfree(p)); \
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checker(expected_size, kcalloc(1, alloc_size, gfp), \
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kfree(p)); \
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checker(expected_size, kcalloc(alloc_size, 1, gfp), \
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kfree(p)); \
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checker(expected_size, \
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kcalloc_node(1, alloc_size, gfp, NUMA_NO_NODE), \
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kfree(p)); \
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checker(expected_size, \
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kcalloc_node(alloc_size, 1, gfp, NUMA_NO_NODE), \
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kfree(p)); \
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checker(expected_size, kmalloc_array(1, alloc_size, gfp), \
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kfree(p)); \
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checker(expected_size, kmalloc_array(alloc_size, 1, gfp), \
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kfree(p)); \
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checker(expected_size, \
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kmalloc_array_node(1, alloc_size, gfp, NUMA_NO_NODE), \
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kfree(p)); \
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checker(expected_size, \
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kmalloc_array_node(alloc_size, 1, gfp, NUMA_NO_NODE), \
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kfree(p)); \
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checker(expected_size, __kmalloc(alloc_size, gfp), \
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kfree(p)); \
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checker(expected_size, \
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__kmalloc_node(alloc_size, gfp, NUMA_NO_NODE), \
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kfree(p)); \
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\
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orig = kmalloc(alloc_size, gfp); \
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KUNIT_EXPECT_TRUE(test, orig != NULL); \
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checker((expected_size) * 2, \
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krealloc(orig, (alloc_size) * 2, gfp), \
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kfree(p)); \
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orig = kmalloc(alloc_size, gfp); \
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KUNIT_EXPECT_TRUE(test, orig != NULL); \
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checker((expected_size) * 2, \
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krealloc_array(orig, 1, (alloc_size) * 2, gfp), \
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kfree(p)); \
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orig = kmalloc(alloc_size, gfp); \
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KUNIT_EXPECT_TRUE(test, orig != NULL); \
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checker((expected_size) * 2, \
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krealloc_array(orig, (alloc_size) * 2, 1, gfp), \
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kfree(p)); \
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\
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len = 11; \
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/* Using memdup() with fixed size, so force unknown length. */ \
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if (!__builtin_constant_p(expected_size)) \
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len += zero_size; \
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checker(len, kmemdup("hello there", len, gfp), kfree(p)); \
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} while (0)
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DEFINE_ALLOC_SIZE_TEST_PAIR(kmalloc)
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/* Sizes are in pages, not bytes. */
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#define TEST_vmalloc(checker, expected_pages, alloc_pages) do { \
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gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \
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checker((expected_pages) * PAGE_SIZE, \
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vmalloc((alloc_pages) * PAGE_SIZE), vfree(p)); \
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checker((expected_pages) * PAGE_SIZE, \
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vzalloc((alloc_pages) * PAGE_SIZE), vfree(p)); \
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checker((expected_pages) * PAGE_SIZE, \
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__vmalloc((alloc_pages) * PAGE_SIZE, gfp), vfree(p)); \
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} while (0)
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DEFINE_ALLOC_SIZE_TEST_PAIR(vmalloc)
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/* Sizes are in pages (and open-coded for side-effects), not bytes. */
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#define TEST_kvmalloc(checker, expected_pages, alloc_pages) do { \
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gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \
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size_t prev_size; \
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void *orig; \
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\
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checker((expected_pages) * PAGE_SIZE, \
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kvmalloc((alloc_pages) * PAGE_SIZE, gfp), \
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vfree(p)); \
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checker((expected_pages) * PAGE_SIZE, \
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kvmalloc_node((alloc_pages) * PAGE_SIZE, gfp, NUMA_NO_NODE), \
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vfree(p)); \
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checker((expected_pages) * PAGE_SIZE, \
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kvzalloc((alloc_pages) * PAGE_SIZE, gfp), \
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vfree(p)); \
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checker((expected_pages) * PAGE_SIZE, \
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kvzalloc_node((alloc_pages) * PAGE_SIZE, gfp, NUMA_NO_NODE), \
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vfree(p)); \
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checker((expected_pages) * PAGE_SIZE, \
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kvcalloc(1, (alloc_pages) * PAGE_SIZE, gfp), \
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vfree(p)); \
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checker((expected_pages) * PAGE_SIZE, \
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kvcalloc((alloc_pages) * PAGE_SIZE, 1, gfp), \
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vfree(p)); \
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checker((expected_pages) * PAGE_SIZE, \
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kvmalloc_array(1, (alloc_pages) * PAGE_SIZE, gfp), \
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vfree(p)); \
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checker((expected_pages) * PAGE_SIZE, \
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kvmalloc_array((alloc_pages) * PAGE_SIZE, 1, gfp), \
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vfree(p)); \
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\
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prev_size = (expected_pages) * PAGE_SIZE; \
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orig = kvmalloc(prev_size, gfp); \
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KUNIT_EXPECT_TRUE(test, orig != NULL); \
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checker(((expected_pages) * PAGE_SIZE) * 2, \
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kvrealloc(orig, prev_size, \
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((alloc_pages) * PAGE_SIZE) * 2, gfp), \
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kvfree(p)); \
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} while (0)
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DEFINE_ALLOC_SIZE_TEST_PAIR(kvmalloc)
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#define TEST_devm_kmalloc(checker, expected_size, alloc_size) do { \
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gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \
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const char dev_name[] = "fortify-test"; \
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struct device *dev; \
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void *orig; \
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size_t len; \
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\
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/* Create dummy device for devm_kmalloc()-family tests. */ \
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dev = root_device_register(dev_name); \
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KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev), \
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"Cannot register test device\n"); \
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\
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checker(expected_size, devm_kmalloc(dev, alloc_size, gfp), \
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devm_kfree(dev, p)); \
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checker(expected_size, devm_kzalloc(dev, alloc_size, gfp), \
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devm_kfree(dev, p)); \
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checker(expected_size, \
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devm_kmalloc_array(dev, 1, alloc_size, gfp), \
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devm_kfree(dev, p)); \
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checker(expected_size, \
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devm_kmalloc_array(dev, alloc_size, 1, gfp), \
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devm_kfree(dev, p)); \
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checker(expected_size, \
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devm_kcalloc(dev, 1, alloc_size, gfp), \
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devm_kfree(dev, p)); \
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checker(expected_size, \
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devm_kcalloc(dev, alloc_size, 1, gfp), \
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devm_kfree(dev, p)); \
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\
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orig = devm_kmalloc(dev, alloc_size, gfp); \
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KUNIT_EXPECT_TRUE(test, orig != NULL); \
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checker((expected_size) * 2, \
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devm_krealloc(dev, orig, (alloc_size) * 2, gfp), \
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devm_kfree(dev, p)); \
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\
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len = 4; \
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/* Using memdup() with fixed size, so force unknown length. */ \
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if (!__builtin_constant_p(expected_size)) \
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len += zero_size; \
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checker(len, devm_kmemdup(dev, "Ohai", len, gfp), \
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devm_kfree(dev, p)); \
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\
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device_unregister(dev); \
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} while (0)
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DEFINE_ALLOC_SIZE_TEST_PAIR(devm_kmalloc)
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static struct kunit_case fortify_test_cases[] = {
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KUNIT_CASE(known_sizes_test),
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KUNIT_CASE(control_flow_split_test),
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KUNIT_CASE(alloc_size_kmalloc_const_test),
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KUNIT_CASE(alloc_size_kmalloc_dynamic_test),
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KUNIT_CASE(alloc_size_vmalloc_const_test),
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KUNIT_CASE(alloc_size_vmalloc_dynamic_test),
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KUNIT_CASE(alloc_size_kvmalloc_const_test),
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KUNIT_CASE(alloc_size_kvmalloc_dynamic_test),
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KUNIT_CASE(alloc_size_devm_kmalloc_const_test),
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KUNIT_CASE(alloc_size_devm_kmalloc_dynamic_test),
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{}
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};
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static struct kunit_suite fortify_test_suite = {
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.name = "fortify",
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.test_cases = fortify_test_cases,
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};
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kunit_test_suite(fortify_test_suite);
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MODULE_LICENSE("GPL");
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