On Tue, Mar 28, 2023, at 18:48, Gregory Price wrote: > On arm64, access_ok makes adjustments to pointers based on whether > memory tagging is enabled for a task (ARM MTE). When leveraging ptrace, > it's possible for a task to enable/disable various kernel features (such > as syscall user dispatch) which require user points as arguments. > > To enable Task A to set these features via ptrace with Task B's > pointers, a task variant of access_ok is required for architectures with > features such as memory tagging. > > If the architecture does not implement task_access_ok, the operation > reduces to access_ok and the task argument is discarded. > > Signed-off-by: Gregory Price <gregory.price@xxxxxxxxxxxx> For asm-generic: Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
