| 1 | // Test that __msan_copy_shadow copies shadow, updates origin and does not touch |
|---|
| 2 | // the application memory. |
|---|
| 3 | // RUN: %clangxx_msan -fsanitize-memory-track-origins=0 -O0 %s -o %t && not %run %t 2>&1 |
|---|
| 4 | // RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O0 %s -o %t && not %run %t 2>&1 | FileCheck --check-prefix=CHECK --check-prefix=CHECK-%short-stack %s |
|---|
| 5 | |
|---|
| 6 | #include <assert.h> |
|---|
| 7 | #include <string.h> |
|---|
| 8 | #include <sanitizer/msan_interface.h> |
|---|
| 9 | |
|---|
| 10 | int main() { |
|---|
| 11 | char *a = new char[4]; |
|---|
| 12 | char *b = new char[4]; |
|---|
| 13 | a[1] = 1; |
|---|
| 14 | a[3] = 2; |
|---|
| 15 | memset(s: b, c: 42, n: 4); |
|---|
| 16 | |
|---|
| 17 | // Test that __msan_copy_shadow does not touch the contents of b[]. |
|---|
| 18 | __msan_copy_shadow(dst: b, src: a, size: 4); |
|---|
| 19 | __msan_unpoison(a: b, size: 4); |
|---|
| 20 | assert(b[0] == 42 && b[1] == 42 && b[2] == 42 && b[3] == 42); |
|---|
| 21 | |
|---|
| 22 | // Test that __msan_copy_shadow correctly updates shadow and origin of b[]. |
|---|
| 23 | __msan_copy_shadow(dst: b, src: a, size: 4); |
|---|
| 24 | assert(__msan_test_shadow(b, 4) == 0); |
|---|
| 25 | assert(__msan_test_shadow(b + 1, 3) == 1); |
|---|
| 26 | assert(__msan_test_shadow(b + 3, 1) == -1); |
|---|
| 27 | __msan_check_mem_is_initialized(x: b, size: 4); |
|---|
| 28 | // CHECK: use-of-uninitialized-value |
|---|
| 29 | // CHECK: {{in main.*msan_copy_shadow.cpp:}}[[@LINE-2]] |
|---|
| 30 | // CHECK: Uninitialized value was stored to memory at |
|---|
| 31 | // CHECK-FULL-STACK: {{in main.*msan_copy_shadow.cpp:}}[[@LINE-8]] |
|---|
| 32 | // CHECK-SHORT-STACK: {{in __msan_copy_shadow .*msan_interceptors.cpp:}} |
|---|
| 33 | // CHECK: Uninitialized value was created by a heap allocation |
|---|
| 34 | // CHECK: {{in main.*msan_copy_shadow.cpp:}}[[@LINE-23]] |
|---|
| 35 | } |
|---|
| 36 | |
|---|
