Messages in this thread | | | Subject | Re: [x86-tip] RSDP changes converted i4790 box SMP -> UP | From | Juergen Gross <> | Date | Mon, 15 Jan 2018 16:40:32 +0100 |
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On 15/01/18 16:32, Ingo Molnar wrote: > > * Juergen Gross <jgross@suse.com> wrote: > >> On 15/01/18 15:56, Borislav Petkov wrote: >>> On Mon, Jan 15, 2018 at 03:52:25PM +0100, Juergen Gross wrote: >>>> Ingo, with my finding that above boot failure is related to a bug in >>>> openSUSE's grub2 (I've verified it soesn't exist in upstream grub2), >>> >>> The box I'm seeing this on has SLES12-SP2 grub: >>> >>> Version : 2.02~beta2-115.9.1 >>> >>> Does it have the same bug? >> >> The patch introducing this problem is from 2012. So I guess: yes. > > I suspect this makes it a widespread, unintended ABI. Can we detect and somehow avoid it? > > The boot protocol ABI sucks if it's fragile against such mistakes.
Well, copying sizeof(setup_header) into grub2 and then coyping back just 1024 bytes is plain wrong. It is a miracle nothing broke up to now.
Juergen
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