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KVM: arm64: Add UBSan tests for PKVM.
Test the UBsan functionality inside hyp/nVHE. Because modules are not supported inside of hyp/nVHE code, the default testing module for UBSan can not be used. New functions have to be defined inside of hyp/nVHE. They are called in kvm_get_mdcr_el2, to test UBSAN whenever a VM starts. Change-Id: Icf998da0af023c74d45be90788ac9f694e61c97c Signed-off-by: Elena Petrova <lenaptr@google.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| /* SPDX-License-Identifier: GPL-2.0-only */ | ||
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| #include <linux/ctype.h> | ||
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| typedef void(*test_ubsan_fp)(void); | ||
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| static void test_ubsan_add_overflow(void) | ||
| { | ||
| volatile int val = INT_MAX; | ||
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| val += 2; | ||
| } | ||
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| static void test_ubsan_sub_overflow(void) | ||
| { | ||
| volatile int val = INT_MIN; | ||
| volatile int val2 = 2; | ||
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| val -= val2; | ||
| } | ||
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| static void test_ubsan_mul_overflow(void) | ||
| { | ||
| volatile int val = INT_MAX / 2; | ||
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| val *= 3; | ||
| } | ||
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| static void test_ubsan_negate_overflow(void) | ||
| { | ||
| volatile int val = INT_MIN; | ||
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| val = -val; | ||
| } | ||
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| static void test_ubsan_divrem_overflow(void) | ||
| { | ||
| volatile int val = 16; | ||
| volatile int val2 = 0; | ||
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| val /= val2; | ||
| } | ||
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| static void test_ubsan_shift_out_of_bounds(void) | ||
| { | ||
| volatile int val = -1; | ||
| int val2 = 10; | ||
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| val2 <<= val; | ||
| } | ||
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| static void test_ubsan_out_of_bounds(void) | ||
| { | ||
| volatile int i = 4, j = 5; | ||
| volatile int arr[4]; | ||
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| arr[j] = i; | ||
| } | ||
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| static void test_ubsan_load_invalid_value(void) | ||
| { | ||
| volatile char *dst, *src; | ||
| bool val, val2, *ptr; | ||
| char c = 4; | ||
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| dst = (char *)&val; | ||
| src = &c; | ||
| *dst = *src; | ||
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| ptr = &val2; | ||
| val2 = val; | ||
| } | ||
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| static void test_ubsan_misaligned_access(void) | ||
| { | ||
| volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5}; | ||
| volatile int *ptr, val = 6; | ||
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| ptr = (int *)(arr + 1); | ||
| *ptr = val; | ||
| } | ||
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| static void test_ubsan_object_size_mismatch(void) | ||
| { | ||
| /* "((aligned(8)))" helps this not into be misaligned for ptr-access. */ | ||
| volatile int val __aligned(8) = 4; | ||
| volatile long long *ptr, val2; | ||
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| ptr = (long long *)&val; | ||
| val2 = *ptr; | ||
| } | ||
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| static const test_ubsan_fp test_ubsan_array[] = { | ||
| test_ubsan_out_of_bounds, | ||
| test_ubsan_add_overflow, | ||
| test_ubsan_sub_overflow, | ||
| test_ubsan_mul_overflow, | ||
| test_ubsan_negate_overflow, | ||
| test_ubsan_divrem_overflow, | ||
| test_ubsan_shift_out_of_bounds, | ||
| test_ubsan_load_invalid_value, | ||
| test_ubsan_misaligned_access, | ||
| test_ubsan_object_size_mismatch, | ||
| }; | ||
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| static void test_ubsan(void) | ||
| { | ||
| unsigned int i; | ||
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| for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++) | ||
| test_ubsan_array[i](); | ||
| } |
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