[kernel-hardening] Re: [PATCH v3 0/7] arm64: Privileged Access Never using TTBR0_EL1 switching

[Sami Tolvanen]

On Thu, Sep 15, 2016 at 05:20:45PM +0100, Mark Rutland wrote:
> Likewise, how do we handle __flush_cache_user_range and
> flush_icache_range? Some callers (e.g. __do_compat_cache_op) pass in
> __user addresses.

Also EXEC_USERSPACE in lkdtm passes a user space address to flush_icache_range
and causes the process to hang when I tested these patches on HiKey.

Adding uaccess_{enable,disable}_not_uao to __flush_cache_user_range appears to
fix the problem.

Sami