Messages in this thread | | | Date | Mon, 28 Nov 2011 14:56:06 -0800 | From | Tejun Heo <> | Subject | Re: [RFC] prctl: Add PR_ codes to restore vDSO and tune up mm_struct entires |
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Hello, Cyrill.
On Thu, Nov 24, 2011 at 04:00:51PM +0400, Cyrill Gorcunov wrote: > + case PR_SETUP_VDSO_AT: > + if (arg3 | arg4 | arg5) > + return -EINVAL; > + > + if (!capable(CAP_SYS_ADMIN)) > + return -EPERM; > + > +#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES > + error = arch_setup_additional_pages_at((void *)arg2); > +#else > + error = -ENOSYS; > +#endif > + break;
Hmmm... I'm not sure this is the best approach. vdso is supposed to be able to be dependent on binprm too, so the proposed solution could work but I'm not sure whether it's a good one. For now, can't we just copy the vdso and unmap it at the orignal address?
Thanks.
-- tejun
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