Re: sys_kcmp

Cyrill Gorcunov
2012-09-24T20:35:21Z

On Mon, Sep 24, 2012 at 10:51:19PM +0400, Cyrill Gorcunov wrote:
> > I expect what you want is a call to access_ok, rather than hard coding
> > details about task layout here. This test certainly looks wrong
> > for a 32bit process on a 64bit kernel. If I read your test right it
> > appears I can set values of say 0x100000000 on a 32bit process...
> >
> > As for mmap_min_addr I would expect your find_vma check would make that
> > test unnecessary, simply by not finding a vma...
>
> Good point, Eric, thanks! I'm cooking a new patch now.

Btw, Eric, I somehow miss one bit -- how would you set this 0x100000000
if TASK_SIZE is a macro which does check for TIF_ADDR32 and sets limit
acordingly? What i'm missing?