JDK-8244225 : stringop-overflow warning on strncpy call from compile_the_world_in
- Type: Bug
- Component: hotspot
- Sub-Component: runtime
- Affected Version: 8,11
- Priority: P3
- Status: Resolved
- Resolution: Fixed
- Submitted: 2020-05-01
- Updated: 2020-10-12
- Resolved: 2020-05-05
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| JDK 11 | JDK 8 | Other |
|---|---|---|
| 11.0.9-oracle b01Fixed | 8u271Fixed  |
openjdk8u282Fixed |
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Description
fastdebug builds of 8u and 11u result in the following warning when compiling with gcc 8.3:
/home/dbuck/backports/sanity/jdk11u-cpu/open/src/hotspot/share/classfile/classLoader.cpp: In static member function 'static void ClassLoader::compile_the_world_in(char*, Handle, Thread*)':
/home/dbuck/backports/sanity/jdk11u-cpu/open/src/hotspot/share/classfile/classLoader.cpp:2039:12: warning: 'char* strncpy(char*, const char*, size_t)' specified bound depends on the length of the source argument [-Wstringop-overflow=]
strncpy(buffer, name, len - 6);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
/home/dbuck/backports/sanity/jdk11u-cpu/open/src/hotspot/share/classfile/classLoader.cpp:173:26: note: length computed here
size_t str_len = strlen(str);
~~~~~~^~~~~
This warning will cause builds to fail when warnings-as-errors is enabled (the default).
This code was removed in JDK 12 (see JDK-8213812), so JDK 11 and JDK 8 are the only LTS versions that need to be fixed. There are a number of similar issues elsewhere in 11u, but they can hopefully be addressed by backporting preexisting fixes from later releases.
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