efi/zboot: Set forward edge CFI compat header flag if supported

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Add some plumbing to the zboot EFI header generation to set the newly
introduced DllCharacteristicsEx flag associated with forward edge CFI
enforcement instructions (BTI on arm64, IBT on x86)

x86 does not currently uses the zboot infrastructure, so let's wire it
up only for arm64.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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This commit is contained in:

Ard Biesheuvel 2023-04-18 15:49:51 +02:00

parent bca2f3a940

commit 538bc0f40b

3 changed files with 40 additions and 19 deletions

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1

arch/arm64/boot/Makefile

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9

drivers/firmware/efi/libstub/Makefile.zboot

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49

drivers/firmware/efi/libstub/zboot-header.S

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