Hi Will, On 2017/12/6 20:35, Will Deacon wrote: > config ARM64_SW_TTBR0_PAN > bool "Emulate Privileged Access Never using TTBR0_EL1 switching" > - depends on BROKEN # Temporary while switch_mm is reworked > help > Enabling this option prevents the kernel from accessing > user-space memory directly by pointing TTBR0_EL1 to a reserved
I have a question not related to this patch itself, but to ARM64_SW_TTBR0_PAN: What does ARM64_SW_TTBR0_PAN used for? I means is hardware support PAN, do we still need SW_TTBR0_PAN? And if the hardware do not support PAN, is SW_TTBR0_PAN is *must* option? or there maybe a security risk? Thanks Yisheng Xie
