| // Test that __msan_copy_shadow copies shadow, updates origin and does not touch |
| // the application memory. |
| // RUN: %clangxx_msan -fsanitize-memory-track-origins=0 -O0 %s -o %t && not %run %t 2>&1 |
| // 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 |
| |
| #include <assert.h> |
| #include <string.h> |
| #include <sanitizer/msan_interface.h> |
| |
| int main() { |
| char *a = new char[4]; |
| char *b = new char[4]; |
| a[1] = 1; |
| a[3] = 2; |
| memset(b, 42, 4); |
| |
| // Test that __msan_copy_shadow does not touch the contents of b[]. |
| __msan_copy_shadow(b, a, 4); |
| __msan_unpoison(b, 4); |
| assert(b[0] == 42 && b[1] == 42 && b[2] == 42 && b[3] == 42); |
| |
| // Test that __msan_copy_shadow correctly updates shadow and origin of b[]. |
| __msan_copy_shadow(b, a, 4); |
| assert(__msan_test_shadow(b, 4) == 0); |
| assert(__msan_test_shadow(b + 1, 3) == 1); |
| assert(__msan_test_shadow(b + 3, 1) == -1); |
| __msan_check_mem_is_initialized(b, 4); |
| // CHECK: use-of-uninitialized-value |
| // CHECK: {{in main.*msan_copy_shadow.cc:}}[[@LINE-2]] |
| // CHECK: Uninitialized value was stored to memory at |
| // CHECK-FULL-STACK: {{in main.*msan_copy_shadow.cc:}}[[@LINE-8]] |
| // CHECK-SHORT-STACK: {{in __msan_copy_shadow .*msan_interceptors.cc:}} |
| // CHECK: Uninitialized value was created by a heap allocation |
| // CHECK: {{in main.*msan_copy_shadow.cc:}}[[@LINE-23]] |
| } |
