Messages in this thread | | | Date | Sun, 17 Jul 2011 17:04:35 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 2/2] x86: Allow disabling of sys_iopl, sys_ioperm |
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On 07/17/2011 04:19 PM, Eric Paris wrote: > On Sat, Jul 16, 2011 at 12:42 AM, Mike Waychison <mikew@google.com> wrote: >> On Fri, Jul 15, 2011 at 3:30 PM, Andrew G. Morgan <agm@google.com> wrote: >>> I'd put it in kinit too. >>> >>> I think you may have to think about the call_usermodehelper code, and >>> you might want to look at dropping CAP_SYS_MODULE too. >> >> Looks like usermodehelpers are configurable for both the inheritable >> set and the bounding set via /proc/sys/kernel/usermodehelper/bset and >> /proc/sys/kernel/usermodehelper/inheritable thanks to Eric Paris >> (17f60a7da, available in 3.0-rc1). > > If you look in Fedora and RHEL you'll see that we actually already > provide a dracut module (dracut-caps) which can be used to create an > initrd which contains all of the modules you need to load, it loads > them, and then will drop all of the caps that you want to drop. Good > to see we already solved this problem once!! (although it requires > that your kernel and initrd not be in a place that your root user can > modify it, easy to do in the virt space, no so easy in the real > hardware world) >
Have you considered separating out the kernel-specific portions into a separate initramfs file (preferrably one which could be built from a kernel build tree). The whole dependency of kernels with initramfs is a huge pain for kernel development and debugging...
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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