After opening
/dev/io
for writing
the process is granted full I/O privileges; closing the returned file
descriptor does
not
result in revocation of these privileges.
The new I/O privileges can be useful in order to write userland
programs that handle some hardware directly.
The entire access control is handled by the file access permissions
of
/dev/io
,
so care should be taken in granting rights for this device.
I/O privilege on access to
/dev/io
is only granted if the kernel was built with the
COMPAT_10
option.
/dev/io