Messages in this thread | | | Date | Mon, 9 Dec 2013 17:06:10 -0800 | Subject | Re: [PATCH v2] kexec: add sysctl to disable kexec | From | Kees Cook <> |
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On Mon, Dec 9, 2013 at 4:34 PM, H. Peter Anvin <hpa@zytor.com> wrote: > On 12/09/2013 04:16 PM, Kees Cook wrote: >> For general-purpose (i.e. distro) kernel builds it makes sense to build with >> CONFIG_KEXEC to allow end users to choose what kind of things they want to do >> with kexec. However, in the face of trying to lock down a system with such >> a kernel, there needs to be a way to disable kexec (much like module loading >> can be disabled). Without this, it is too easy for the root user to modify >> kernel memory even when CONFIG_STRICT_DEVMEM and modules_disabled are set. >> >> Signed-off-by: Kees Cook <keescook@chromium.org> >> Acked-by: Rik van Riel <riel@redhat.com> > > So the logic is to load a crashkernel and then lock down the machine > before services, networking etc. are enabled?
Right, or to just turn it off at boot time if kexec will not be used at all.
-Kees
-- Kees Cook Chrome OS Security
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