Messages in this thread | | | Date | Tue, 17 Apr 2012 20:28:32 +0400 | From | Cyrill Gorcunov <> | Subject | Re: [PATCH c/r -mm] c/r: prctl: Simplify PR_SET_MM on mm::code/data assignment |
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On Tue, Apr 17, 2012 at 09:26:07AM -0700, Kees Cook wrote: > On Mon, Apr 16, 2012 at 3:55 PM, Cyrill Gorcunov <gorcunov@openvz.org> wrote: > > The mm::start_code, end_code, start_data, end_data members > > are set during startup of executable file and are not changed > > after. > > > > But the program itself might map new executable or/and data areas in > > time so the original values written into mm fields mentioned above > > might not have correspond VMA area at all, thus if one try to > > use this prctl codes without underlied VMA, the error will be > > returned. > > Hrm, what is the utility of these fields then? If they're not "real", > should the kernel even bother tracking it at all? (Or, should it be > fixed to actually do something useful?)
As far as I see they are used to print statistics on /proc. Maybe here some hidden meaning in them I missed that's why I asked for review ;)
Cyrill
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