| Issue |
91144
|
| Summary |
[libunwind] Undefined behavior pointer arithmetic with null pointer
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
avdv
|
I am using libunwind and when compiling my program with `-fsanitize=undefined` I get several reports of undefined behavior:
```
native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:286:17: runtime error: applying non-zero offset 156 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:286:17 in
native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:286:17: runtime error: member access within null pointer of type 'unwind_info_section_header_index_entry'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:286:17 in
native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:291:17: runtime error: member access within null pointer of type 'unwind_info_section_header_index_entry'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:291:17 in
native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:296:17: runtime error: member access within null pointer of type 'unwind_info_section_header_index_entry'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:296:17 in
native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:296:17: runtime error: applying non-zero offset 12 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:296:17 in
native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:337:17: runtime error: applying non-zero offset 2040 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:337:17 in
native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:343:9: runtime error: applying non-zero offset 160 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:343:9 in
native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:291:17: runtime error: applying non-zero offset 228 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior native/native-code-nativelib_native0.4_3-0.4.17-2/scala-native/platform/posix/libunwind/UnwindCursor.hpp:291:17 in
```
Each of these is using the `arrayoffsetof` macro, which is defined like this:
```
#define arrayoffsetof(type, index, field) ((size_t)(&((type *)0)[index].field))
```
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