[PATCH v3 17/25] arm64: enable POE and PIE to coexist

[Catalin Marinas]

On Fri, Nov 24, 2023 at 04:35:02PM +0000, Joey Gouly wrote:
> Set the EL0/userspace indirection encodings to be the overlay enabled
> variants of the permissions.
> 
> Signed-off-by: Joey Gouly <joey.gouly at arm.com>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Will Deacon <will at kernel.org>
> ---
>  arch/arm64/include/asm/pgtable-prot.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h
> index e9624f6326dd..3007208e04aa 100644
> --- a/arch/arm64/include/asm/pgtable-prot.h
> +++ b/arch/arm64/include/asm/pgtable-prot.h
> @@ -137,10 +137,10 @@ extern bool arm64_use_ng_mappings;
>  
>  #define PIE_E0	( \
>  	PIRx_ELx_PERM(pte_pi_index(_PAGE_EXECONLY),      PIE_X_O) | \
> -	PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY_EXEC), PIE_RX)  | \
> -	PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED_EXEC),   PIE_RWX) | \
> -	PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY),      PIE_R)   | \
> -	PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED),        PIE_RW))
> +	PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY_EXEC), PIE_RX_O)  | \
> +	PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED_EXEC),   PIE_RWX_O) | \
> +	PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY),      PIE_R_O)   | \
> +	PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED),        PIE_RW_O))
>  
>  #define PIE_E1	( \
>  	PIRx_ELx_PERM(pte_pi_index(_PAGE_EXECONLY),      PIE_NONE_O) | \

Don't we need to do this for PIE_E1? Or we consider the futex
(LDXR/STXR) accesses not checked by POE? That's fine by me if we go this
route but we should document it. The alternative is to enable overlay
variants in PIE_E1 but we need to reserve a POE key for the kernel to
use.

-- 
Catalin