On Wed, Feb 16, 2022 at 02:13:28PM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@xxxxxxxx> > > test_kernel_ptr() uses access_ok() to figure out if a given address > points to user space instead of kernel space. However on architectures > that set CONFIG_ALTERNATE_USER_ADDRESS_SPACE, a pointer can be valid > for both, and the check always fails because access_ok() returns true. > > Make the check for user space pointers conditional on the type of > address space layout. What is this code even trying to do? It looks extremly broken.
