On Thu, 15 Aug 2019 at 14:03, Mark Rutland <mark.rutl...@arm.com> wrote:
>
> On Thu, Aug 15, 2019 at 05:56:27AM -0400, skodde wrote:
> > Hi,
> >
> > I've enabled CONFIG_GCC_PLUGIN_STACKLEAK on 5.2.8 for an arm64
> > macchiatobin board and I get the following error when loading the
> > kernel (using grub-efi on top of edk ii):
> >
> > EFI stub: Booting Linux Kernel...
> > EFI stub: ERROR: efi_get_random_bytes() failed
> > EFI stub: ERROR: Failed to relocate kernel
> >
> > The kernel boots fine with that option disabled, but strangely
> > presents the same error when disabling only CONFIG_RANDOMIZE_BASE.
>
> That shouldn't be possible, given the IS_ENABLED(CONFIG_RANDOMIZE_BASE)
> guard around the efi_get_random_bytes() call, so something sounds wrong.
>
> Are you certain that you're running the same kernel Image that you
> rebuilt?
>
> Ard, do you reckon it would be worth adding the UTS_RELEASE and
> UTS_VERSION to the " Booting Linux Kernel..." string? It would make
> debugging that potential issue easier.
>

Use of the UTS_xxx macros already triggers an annoying number of
object rebuilds every time you change anything entirely unrelated in
your kernel sources, so I'd prefer to avoid this tbh.

> > Let me know if I can provide more info or do some tests.
>
> Maybe there's a problem with stale objects. If you're not doing so
> already, could you try a clean build with CONFIG_RANDOMIZE_BASE
> deselected?
>

Also, can you try booting with the nokaslr command line option added?

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