STINNER Victor <victor.stin...@gmail.com> added the comment:
In function ‘wcsncpy’,
inlined from ‘calculate_zip_path’ at ./Modules/getpath.c:797:5:
/usr/include/x86_64-linux-gnu/bits/wchar2.h:200:9: warning: call to
‘__wcsncpy_chk_warn’ declared with attribute warning: wcsncpy called with
length bigger than size of destination buffer
return __wcsncpy_chk_warn (__dest, __src, __n,
^
Line 797:
wcsncpy(calculate->zip_path, prefix, MAXPATHLEN);
calculate type is "PyCalculatePath *" which is defined as:
typedef struct {
...
wchar_t zip_path[MAXPATHLEN+1]; /* ".../lib/pythonXY.zip" */
...
} PyCalculatePath;
Earlier, all bytes are set to 0:
memset(&calculate, 0, sizeof(calculate));
So I don't see how wcsncpy() can overflow.
By the way, I'm unable to reproduce the warning on Fedora 27 with GCC 7.2.1.
Are you using -D_FORTIFY_SOURCE=1? Are you compiling Python in release mode?
Can you try to find the command line compiling getpath.c?
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<https://bugs.python.org/issue32375>
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