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 %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(b, 42, 4); 16 17 // Test that __msan_copy_shadow does not touch the contents of b[]. 18 __msan_copy_shadow(b, a, 4); 19 __msan_unpoison(b, 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(b, a, 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(b, 4); 28 // CHECK: use-of-uninitialized-value 29 // CHECK: {{in main.*msan_copy_shadow.cc:}}[[@LINE-2]] 30 // CHECK: Uninitialized value was stored to memory at 31 // CHECK: {{in main.*msan_copy_shadow.cc:}}[[@LINE-8]] 32 // CHECK: Uninitialized value was created by a heap allocation 33 // CHECK: {{in main.*msan_copy_shadow.cc:}}[[@LINE-22]] 34 } 35
