Re: KASLR kernel fails to boot

[Maxime Villard <max%m00nbsd.net@localhost>]

Sorry about this, there was a file I forgot in my commit command line for a
change two weeks ago:

	https://mail-index.netbsd.org/source-changes/2020/05/23/msg117587.html

The lack of call to elf_build_info() caused a sanity check in the prekern to
fail.

Thanks for reporting


Le 22/05/2020 à 12:42, Chavdar Ivanov a écrit :
> After the latest updates to /usr/mdec/prekern, now I am getting
> ------------
> FATAL
> elf sym lookup: symbol beyond table
> ------------
>
> when I try to load the KASLR kernel.
>
> Chavdar
>
> On Tue, 5 May 2020 at 21:26, Chavdar Ivanov <ci4ic4%gmail.com@localhost> wrote:
> > Ok, thanks.
> >
> > On Tue, 5 May 2020 at 20:21, Maxime Villard <max%m00nbsd.net@localhost> wrote:
> > > Le 05/05/2020 à 21:01, Chavdar Ivanov a écrit :
> > > > On Mon, 4 May 2020 at 21:21, Chavdar Ivanov <ci4ic4%gmail.com@localhost> wrote:
> > > > > Hi,
> > > > >
> > > > > netbsd-GENERIC_KASLR from yesterday fails to pass the prekern stage
> > > > > with a frightening message in red 'Page fault'. I've never seen this
> > > > > before, no idea if I can get any further info.
> > > > >
> > > > > This machine has been otherwise running KASLR kernel for some four
> > > > > months now without a problem; it is a VirtualBox guest.
> > > >
> > > > Same with just completed clean buid of 9.99.60.
> > > >
> > > > After "[+] Rel relocations applied" I get:
> > > >
> > > > ****** Fault occurred ******
> > > > page fault
> > > > ******************************
> > > >
> > > > I switched th vm to the normal kernel, no problem otherwise.
> > >
> > > I know, this is because of the Xen section in the binary, which is not
> > > marked as allocatable. The prekern explicitly decides not to map the note
> > > but then proceeds to relocate its RELAs regardless, which causes a fatal
> > > page fault.
> > >
> > > Trivial to fix but I'm not sure which policy to choose, may take a few
> > > days.
> >
> >
> >
> > --
> > ----