[Bug 281433] Changing kern.elf64 sysctl's requires press-button reboot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281433

--- Comment #5 from dewayne@heuristicsystems.com.au ---
(In reply to dewayne from comment #4)
A self inflicted issue from the outset.  Of course the combination that I want
is
kern.elf64.allow_wx: 1 -> 0
kern.elf64.nxstack: 1 -> 1

For the interested: 
readelf -W -l `which whoami`
  GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW  0

Create a trivial C program, compile with -Wl,-z,execstack, result (RWE)
  GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RWE 0

compile with  -Wl,-z,noexecstack, results in (RW)
  GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW  0

Very much appreciate the "pointer" to PT_GNU_STACK, I learnt something I
should've known. And yes, the result is expected :)

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