KVM: arm64: nVHE: Support CONFIG_CFI_CLANG at EL2

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The compiler implements kCFI by adding type information (u32) above
every function that might be indirectly called and, whenever a function
pointer is called, injects a read-and-compare of that u32 against the
value corresponding to the expected type. In case of a mismatch, a BRK
instruction gets executed. When the hypervisor triggers such an
exception in nVHE, it panics and triggers and exception return to EL1.

Therefore, teach nvhe_hyp_panic_handler() to detect kCFI errors from the
ESR and report them. If necessary, remind the user that EL2 kCFI is not
affected by CONFIG_CFI_PERMISSIVE.

Pass $(CC_FLAGS_CFI) to the compiler when building the nVHE hyp code.

Use SYM_TYPED_FUNC_START() for __pkvm_init_switch_pgd, as nVHE can't
call it directly and must use a PA function pointer from C (because it
is part of the idmap page), which would trigger a kCFI failure if the
type ID wasn't present.

Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240610063244.2828978-9-ptosi@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Pierre-Clément Tosi 2024-06-10 07:32:37 +01:00 • committed by Oliver Upton

parent 8f3873a395

commit eca4ba5b6d

3 changed files with 18 additions and 4 deletions

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10

arch/arm64/kvm/handle_exit.c

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6

arch/arm64/kvm/hyp/nvhe/Makefile

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6

arch/arm64/kvm/hyp/nvhe/hyp-init.S

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