Re: [PATCH v15 13/25] x86/reboot: Add ljmp instructions to stacktool whitelist

[H. Peter Anvin]

On 01/19/16 21:42, Josh Poimboeuf wrote:
>>>>
>>>>   Apparently(?) xen treats the ud2 special when it's followed by "78 65
>>>>   6e".  This is confusing for stacktool because ud2 is normally a dead
>>>>   end, and it thinks the instructions after it will never run.
>>>>   

Cute.  UD2 followed by three ASCII characters.  I guess that becomes
really fun when using UD2 + a string for error reporting.  Of course, no
software does that...

	-hpa