[CRIU] [PATCH] dump: Make sure we're not dumping unsupported task

[Cyrill Gorcunov]

On Thu, Feb 14, 2013 at 12:06:46PM +0400, Pavel Emelyanov wrote:
> On 02/14/2013 12:39 AM, Cyrill Gorcunov wrote:
> > On Thu, Feb 14, 2013 at 12:21:34AM +0400, Pavel Emelyanov wrote:
> >> On 02/13/2013 08:49 PM, Cyrill Gorcunov wrote:
> >>> Ping?
> >> Sorry.
> >>
> >> Checking for task bitness by its auxv size is ... ugly.
> > 
> > The kernel doesn't provide other interface as far as I know
> > in case of x86-32 task running on x86-64 node (there is a
> > couple of tricks which could be used to figure that out
> > but they are ugly). I'll try to talk to a knowing person
> > about that, will report.
> 
> AFAIK we can check for cs/ds values in regsets to distinguish that.

No, before we can _test_ the segment registers we need to fetch
them somehow, and when task is in compat mode the ptrace returns
different registers view (not that we're providing buffer for).
That said, it's easier to read auxv than mocking with ptrace data.