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17 May 2024, 09:02:56 UTC
Revision 9b9eaee9828fe98b030cf43ac50065a54a2f5d52 authored by Ard Biesheuvel on 06 November 2022, 14:53:54 UTC, committed by Ard Biesheuvel on 10 November 2022, 22:14:15 UTC 
arm64: efi: Fix handling of misaligned runtime regions and drop warning
 
Currently, when mapping the EFI runtime regions in the EFI page tables,
we complain about misaligned regions in a rather noisy way, using
WARN().

Not only does this produce a lot of irrelevant clutter in the log, it is
factually incorrect, as misaligned runtime regions are actually allowed
by the EFI spec as long as they don't require conflicting memory types
within the same 64k page.

So let's drop the warning, and tweak the code so that we
- take both the start and end of the region into account when checking
  for misalignment
- only revert to RWX mappings for non-code regions if misaligned code
  regions are also known to exist.

Cc: <stable@vger.kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
1 parent 550b33c
History
Tip revision: 9b9eaee9828fe98b030cf43ac50065a54a2f5d52 authored by Ard Biesheuvel on 06 November 2022, 14:53:54 UTC
arm64: efi: Fix handling of misaligned runtime regions and drop warning
Tip revision: 9b9eaee
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