[$] Another try for getrandom() in the vDSO

Random numbers, it seems, can never be random enough, and they cannot begenerated quickly enough. The kernel's getrandom()system call might, after years of discussion, be seen as sufficientlysecure by most users, but it is still a system call. Linux system callsare relatively fast, but they are necessarily slower than calling afunction directly. In an attempt to speed the provision of secure randomdata to user space, Jason Donenfeld has put together animplementation of getrandom() that lives in the virtual dynamicshared object (vDSO) area.