On 12/14/2012 02:48 PM, H. Peter Anvin wrote:
On 12/14/2012 02:43 PM, Cyrill Gorcunov wrote:
On Fri, Dec 14, 2012 at 02:27:08PM -0800, H. Peter Anvin wrote:
This won't help in case of scenario you've been pointing in
previous email (where c/r happens in a middle of vdso),
would it? Because we still need somehow to be sure we're not
checkpointing in a middle of signal handler which will return
to some vdso place.
It is okay if and only if those vdso places never change... which I
think is doable if they only contain trival system call wrappers, i.e.
something like:
movl $__SYS_gettimeofday, %eax
syscall
ret
Though doesn't this make it easier for exploits (somewhat undoing ASLR)?
I know Andi always wanted to avoid having syscall instructions at a
fixed location for the old vsyscall code (though I know we had it
none-the-less for awhile). But maybe I'm confusing issues here?
thanks
-john
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/