On Thu, Oct 6, 2011 at 5:06 AM, Andrew Lutomirski <luto@mit.edu> wrote:
> I'll see how ugly the patch to get this all correct is.  It may not be
> all that pretty because we won't be able to use sys_gettimeofday
> anymore.

BTW: The attached program triggers the issue.

on 3.1-rc8+:
# ./sig.dyn
faulting address: 0xdeadbeef
# ./sig.static
[   19.075106] sig.static[863] vsyscall fault (exploit attempt?)
ip:ffffffffff600000 cs:33 sp:7fff9e53d8c8 ax:ffffffffff600000 si:0
di:deadbeef
faulting address: 0x0

I guess UML is not the only user of this feature...

-- 
Thanks,
//richard