On Wed, Oct 28, 2020 at 04:45:49PM -0400, Arvind Sankar wrote:
> It's become ABI I think: looks like it's included by that name in
> vmcoreinfo for kexec crash dumps.
Yeah, last time we had the ABI discussion we agreed with the kexec/crash
folks that this is not an ABI and that crash is "tied" mor
On Wed, Oct 28, 2020 at 08:43:55PM +0100, Borislav Petkov wrote:
> On Wed, Oct 28, 2020 at 12:45:51PM -0400, Arvind Sankar wrote:
> > You don't want to try to run the kernel from physical address 0 in any
> > case. The default is set to 16MiB to avoid low memory, historically to
> > avoid the 24-bi
On Wed, Oct 28, 2020 at 12:45:51PM -0400, Arvind Sankar wrote:
> You don't want to try to run the kernel from physical address 0 in any
> case. The default is set to 16MiB to avoid low memory, historically to
> avoid the 24-bit ISA DMA range.
Sure, that's why I wrote:
"... so I guess this should
On Tue, Oct 27, 2020 at 05:14:22PM -0400, Arvind Sankar wrote:
> This is indeed just a small correctness fixlet, but I'm not following
> the rest of your comments.
I'm just trying to make sense of that house of cards we have here.
> PHYSICAL_START has an effect independent of the setting of
> REL
On Wed, Oct 28, 2020 at 02:39:09PM +0100, Borislav Petkov wrote:
> On Tue, Oct 27, 2020 at 05:14:22PM -0400, Arvind Sankar wrote:
> > This is indeed just a small correctness fixlet, but I'm not following
> > the rest of your comments.
>
> I'm just trying to make sense of that house of cards we hav
On Tue, Oct 27, 2020 at 09:08:03PM +0100, Borislav Petkov wrote:
> On Mon, Oct 05, 2020 at 11:15:39AM -0400, Arvind Sankar wrote:
> > Commit b4e0409a36f4 ("x86: check vmlinux limits, 64-bit") added a check
> > that the size of the 64-bit kernel is less than KERNEL_IMAGE_SIZE.
> >
> > The check use
On Mon, Oct 05, 2020 at 11:15:39AM -0400, Arvind Sankar wrote:
> Commit b4e0409a36f4 ("x86: check vmlinux limits, 64-bit") added a check
> that the size of the 64-bit kernel is less than KERNEL_IMAGE_SIZE.
>
> The check uses (_end - _text), but this is not enough. The initial PMD
> used in startup
Commit b4e0409a36f4 ("x86: check vmlinux limits, 64-bit") added a check
that the size of the 64-bit kernel is less than KERNEL_IMAGE_SIZE.
The check uses (_end - _text), but this is not enough. The initial PMD
used in startup_64() (level2_kernel_pgt) can only map upto
KERNEL_IMAGE_SIZE from __STAR
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