Le mer. 30 août 2023, 16:38, Daniel Kiper <dki...@net-space.pl> a écrit :
> On Wed, Aug 30, 2023 at 04:23:36PM +0200, Ard Biesheuvel wrote: > > On Wed, 30 Aug 2023 at 16:18, Daniel Kiper <dki...@net-space.pl> wrote: > > > > > > On Fri, Aug 25, 2023 at 05:50:58AM -0700, Oliver Steffen wrote: > > > > Quoting Vladimir 'phcoder' Serbinenko (2023-08-15 18:14:11) > > > > > > [...] > > > > > > > I am not sure what the best way forward is now, but we at least have > the > > > > patches from Vladimir (thanks!). > > > > > > > > Pedro, Adrian, could you - if you get a chance - try them with a 4 > byte > > > > alignment too? > > > > > > Yes, that would be perfect. If Itanium works then I suggest to align > > > GUIDs to 4 bytes. This alignment is used in the kernel for more than > > > 4 years and it looks nobody complains... > > > > > > Pedro, Adrian, could you change GUIDs alignment in Vladimir's patches > to > > > 4 and test them on Itanium? > > > > > > > Note that itanium is a 64-bit architecture, whereas the potential > > alignment/padding issue I raised only occurs on 32-bit systems. > > Yeah, I know. But IIRC your Linux kernel patch aligns GUIDs to 4 bytes > even on Itanium. So, how does it work on 64-bit architecture and nobody > complained for more than 4 years... Hmmm... > Unaligned access causes an exception. In GRUB it leads to unhandled exception. Linux catches exception and emulates unaligned access. It's typical for RISC platforms
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