Hi,
I just noticed today that mkostemp64 calls __gen_tempname with mode S_IRUSR | S_IWUSR | S_IXUSR, while all other flavors call it with mode S_IRUSR | S_IWUSR, as per POSIX.1-2008.
See libc/stdlib/mkostemp64.c. I assume I don't need to send a patch for that.
Cheers,
Ignacy