Re: [PATCH] Gerd Hoffman's move-vsyscall-into-user-address-range patch

[Ingo Molnar]

* Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote:

> 	Thanks, I looked at the exec-shield patch.  It has some rough 
> edges (at least the 2.6.16 version I found).

the most recent one is always in the Fedora rawhide kernel RPM/SRPM. 
(that means it closely tracks upstream.)

> 	Gerd's is basically a minimal subset of the exec-shield: we 
> can go further towards exec-shield by using get_unmapped_area for the 
> vsyscall page rather than nailing it above the stack, but it takes us 
> from a 280-line patch to a 480-line patch.

certainly looks good to me! What are the changes you did to the 
exec-shield implementation of vdso randomization? The patch seems 
largely identical to the one in exec-shield.

(and it would be nice to do this on x86_64 too - exploits already exist 
using the fixmapped VDSO there as a trampoline.)

Signed-off-by: Ingo Molnar <mingo@xxxxxxx>

	Ingo
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