The behavior of this function is undefined unless its control parameter is set to a specific value.
The Linux Standard Base Specification 2.0.1 for libc places constraints on the arguments to some internal functions [1]. If the constraints are not met, the behavior of the functions is not defined.
The value 1
must be passed to the first parameter (the version number) of the following file system function:
__xmknod
2
must be passed to the third parameter (the group argument) of the following wide character string functions:
__wcstod_internal
__wcstof_internal
_wcstol_internal
__wcstold_internal
__wcstoul_internal
3
must be passed as the first parameter (the version number) of the following file system functions:
__xstat
__lxstat
__fxstat
__xstat64
__lxstat64
__fxstat64
[1] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 475
[2] The Linux Standard Base Specification 2.0.1, Interfaces Definitions for libc.