powerpc/align: Don't use __get_user_instr() on kernel addresses

In the old days, when we didn't have kernel userspace access
protection and had set_fs(), it was wise to use __get_user()
and friends to read kernel memory.

Nowadays, get_user() is granting userspace access and is exclusively
for userspace access.

In alignment exception handler, use probe_kernel_read_inst()
instead of __get_user_instr() for reading instructions in kernel.

This will allow to remove the is_kernel_addr() check in
__get/put_user() in a following patch.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d9ecbce00178484e66ca7adec2ff210058037704.1615398265.git.christophe.leroy@csgroup.eu

arch/powerpc/kernel/align.c

@@ -310,7 +310,12 @@ int fix_alignment(struct pt_regs *regs)
 	 */
 	CHECK_FULL_REGS(regs);
 
-	if (unlikely(__get_user_instr(instr, (void __user *)regs->nip)))
+	if (is_kernel_addr(regs->nip))
+		r = probe_kernel_read_inst(&instr, (void *)regs->nip);
+	else
+		r = __get_user_instr(instr, (void __user *)regs->nip);
+
+	if (unlikely(r))
 		return -EFAULT;
 	if ((regs->msr & MSR_LE) != (MSR_KERNEL & MSR_LE)) {
 		/* We don't handle PPC little-endian any more... */