linux(4): Export the AT_RANDOM depending on the process osreldata

[dchagin]

Summary

AT_RANDOM has appeared in the 2.6.30 Linux kernel first time.

[emaste]

My quick google suggests Linux AT_CANARY is defined as pointing to 16 random bytes.
Should we add either a runtime test or assertion that imgp->canarylen >= 16?

[dchagin]

In D39646#902353, @emaste wrote:

My quick google suggests Linux AT_CANARY is defined as pointing to 16 random bytes.
Should we add either a runtime test or assertion that imgp->canarylen >= 16?

https://cgit.freebsd.org/src/tree/sys/compat/linux/linux_elf.c#n332