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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /lib/test_ubsan.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/test_ubsan.c')
-rw-r--r-- | lib/test_ubsan.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/lib/test_ubsan.c b/lib/test_ubsan.c new file mode 100644 index 0000000000..2062be1f2e --- /dev/null +++ b/lib/test_ubsan.c @@ -0,0 +1,122 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> + +typedef void(*test_ubsan_fp)(void); + +#define UBSAN_TEST(config, ...) do { \ + pr_info("%s " __VA_ARGS__ "%s(%s=%s)\n", __func__, \ + sizeof(" " __VA_ARGS__) > 2 ? " " : "", \ + #config, IS_ENABLED(config) ? "y" : "n"); \ + } while (0) + +static void test_ubsan_divrem_overflow(void) +{ + volatile int val = 16; + volatile int val2 = 0; + + UBSAN_TEST(CONFIG_UBSAN_DIV_ZERO); + val /= val2; +} + +static void test_ubsan_shift_out_of_bounds(void) +{ + volatile int neg = -1, wrap = 4; + int val1 = 10; + int val2 = INT_MAX; + + UBSAN_TEST(CONFIG_UBSAN_SHIFT, "negative exponent"); + val1 <<= neg; + + UBSAN_TEST(CONFIG_UBSAN_SHIFT, "left overflow"); + val2 <<= wrap; +} + +static void test_ubsan_out_of_bounds(void) +{ + volatile int i = 4, j = 5, k = -1; + volatile char above[4] = { }; /* Protect surrounding memory. */ + volatile int arr[4]; + volatile char below[4] = { }; /* Protect surrounding memory. */ + + above[0] = below[0]; + + UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "above"); + arr[j] = i; + + UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "below"); + arr[k] = i; +} + +enum ubsan_test_enum { + UBSAN_TEST_ZERO = 0, + UBSAN_TEST_ONE, + UBSAN_TEST_MAX, +}; + +static void test_ubsan_load_invalid_value(void) +{ + volatile char *dst, *src; + bool val, val2, *ptr; + enum ubsan_test_enum eval, eval2, *eptr; + unsigned char c = 0xff; + + UBSAN_TEST(CONFIG_UBSAN_BOOL, "bool"); + dst = (char *)&val; + src = &c; + *dst = *src; + + ptr = &val2; + val2 = val; + + UBSAN_TEST(CONFIG_UBSAN_ENUM, "enum"); + dst = (char *)&eval; + src = &c; + *dst = *src; + + eptr = &eval2; + eval2 = eval; +} + +static void test_ubsan_misaligned_access(void) +{ + volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5}; + volatile int *ptr, val = 6; + + UBSAN_TEST(CONFIG_UBSAN_ALIGNMENT); + ptr = (int *)(arr + 1); + *ptr = val; +} + +static const test_ubsan_fp test_ubsan_array[] = { + test_ubsan_shift_out_of_bounds, + test_ubsan_out_of_bounds, + test_ubsan_load_invalid_value, + test_ubsan_misaligned_access, +}; + +/* Excluded because they Oops the module. */ +static const test_ubsan_fp skip_ubsan_array[] = { + test_ubsan_divrem_overflow, +}; + +static int __init test_ubsan_init(void) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++) + test_ubsan_array[i](); + + return 0; +} +module_init(test_ubsan_init); + +static void __exit test_ubsan_exit(void) +{ + /* do nothing */ +} +module_exit(test_ubsan_exit); + +MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.com>"); +MODULE_LICENSE("GPL v2"); |