[PATCH v2 6/6] arm64: Enable RW, RX and RO mappings for the relocated binary

[Richard Henderson]

On 2/20/25 05:54, Ilias Apalodimas wrote:
> Now that we have everything in place switch the page permissions for
> .rodata, .text and .data just after we relocate everything in top of the
> RAM.
> 
> Unfortunately we can't enable this by default, since we have examples of
> U-Boot crashing due to invalid access. This usually happens because code
> defines const variables that it later writes. So hide it behind a Kconfig
> option until we sort it out.
> 
> It's worth noting that EFI runtime services are not covered by this
> patch on purpose. Since the OS can call SetVirtualAddressMap which can
> relocate runtime services, we need to set them to RX initially but remap
> them as RWX right before ExitBootServices.
> 
> Link:https://lore.kernel.org/u-boot/20250129-rockchip-pinctrl-const-v1-0-450ccdadfa7e@cherry.de/
> Link:https://lore.kernel.org/u-boot/20250130133646.2177194-1-andre.przywara@arm.com/
> Reviewed-by: Jerome Forissier<jerome.forissier at linaro.org>
> Signed-off-by: Ilias Apalodimas<ilias.apalodimas at linaro.org>
> ---
>   common/Kconfig   | 13 +++++++++++++
>   common/board_r.c | 20 ++++++++++++++++++++
>   2 files changed, 33 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson at linaro.org>

r~