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Object Size Checking is a feature which wraps certain functions with checks
to prevent buffer overflows. These are enabled when compiling with
optimization (-O1 and higher) and _FORTIFY_SOURCE defined
to 1, or for stricter checks, to 2.
The following functions use object size checking to detect buffer overflows when enabled:
String functions:
bcopy memmove strcpy bzero mempcpy strcat explicit_bzero memset strncat memcpy stpcpy strncpy
Wide Character String functions:
fgetws wcrtomb wcsrtombs fgetws_unlocked wcscat wmemcpy mbsnrtowcs wcscpy wmemmove mbsrtowcs wcsncat wmempcpy wcpcpy wcsncpy wmemset wcpncpy wcsnrtombs
Stdio functions:
fgets fread_unlocked sprintf fgets_unlocked gets vsnprintf fread snprintf vsprintf
Stdlib functions:
mbstowcs wcstombs wctomb
System functions:
getcwd read ttyname_r pread readlink