http://lxr.free-electrons.com/source/include/linux/syscalls.h#L645 & http://man7.org/linux/man-pages/man2/setrlimit.2.html -> syscall
http://fossies.org/dox/glibc-2.21/sysdeps_2posix_2ulimit_8c_source.html -> we use it in userspace
https://lkml.org/lkml/2012/12/23/75 -> we do not break userspace
Ezek alapján?