Re: + syscalls-x86-add-__nr_kcmp-syscall-v8.patch added to -mm tree

Cyrill Gorcunov
2012-02-15T20:05:39Z

On Wed, Feb 15, 2012 at 11:57:33PM +0400, Vasiliy Kulikov wrote:
> >
> > This makes me scratch the head ;) I think ptrace_may_access (or
> > some other security test) should remain since it's somehow weird
> > if non-root task will be able to find objects order from privileged
> > task. Thus I need to find a way how to handle execve(setuid_app).
> > Need to think...
>
> Look at fs/proc/base.c:lock_trace() - it locks ->cred_guard_mutex
> for the whole period of time when it uses a resource.

Yup, thanks Vasiliy! I've just found cred_guard_mutex in
install_exec_creds. Now I'm thinking if this is what we
need here ;)

Cyrill