ARM: flush_ptrace_access: invalidate all I-caches

copy_to_user_page can be used by access_process_vm to write to an
executable page of a process using a mapping acquired by kmap.
For systems with I-cache aliasing, flushing the I-cache using the
Kernel mapping may leave stale data in the I-cache if the user
mapping is of a different colour.

This patch replaces the coherent_kern_range call in flush_ptrace_access
with a D-cache flush followed by a system-wide I-cache invalidation.
This is required on all systems where the size of a way in the I-cache
is larger than PAGE_SIZE.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

0 files changed, 0 insertions, 0 deletions