[CRIU] [PATCH 3/3] arm64: detect vDSO remaps

[Cyrill Gorcunov]

On Wed, Mar 12, 2014 at 10:15:13AM +0400, Alexander Kartashov wrote:
> >>This patch copes with this problem by adjusting the task struct
> >>when the vDSO area is remapped.
> >What a crap ;) Could you point which exactly variable in task struct
> >bound to vdso address?
> 
> I'm sorry it's not task struct but mm struct but this doesn't make
> any difference. The problem initialization is this
> http://lxr.free-electrons.com/source/arch/arm64/kernel/vdso.c#L171

So we will meet the same problem on x86-32 ;) I guess we rather need
prctl extension for that which would allow to do user-space

 - remap vdso into a new place (setting up mm::context.vdso to null
   or something, to disable vdso handling until mm::context.vdso reassigned)
 - call prctl and set up new mm::context.vdso value

need to think...