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