Re: [patch 2/2] c/r: prctl: Add ability to get clear_tid_address

[Cyrill Gorcunov]

On Mon, Mar 19, 2012 at 09:51:36AM -0700, Kees Cook wrote:
> On Fri, Mar 16, 2012 at 1:55 PM, Cyrill Gorcunov <gorcunov@xxxxxxxxxx> wrote:
> > Zero is written at clear_tid_address, when
> > the process exits. This functionality is used
> > by pthread_join().
> >
> > We already have sys_set_tid_address() to change this
> > address for current task but there is no way to obtain
> > it from a user space.
> 
> Is it worth introducing a syscall for this just for symmetry? I
> suspect not, in which case:
> 
> Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
> 

Thanks Kees! syscall was considered as "no-no" in previous
convesation about this patch, so we switched to prctl.

	Cyrill
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