x86/unwind/orc: Recheck address range after stack info was updated

A crash was observed in the ORC unwinder:

  BUG: stack guard page was hit at 000000000dd984a2 (stack is 00000000d1caafca..00000000613712f0)
  kernel stack overflow (page fault): 0000 [#1] SMP NOPTI
  CPU: 93 PID: 23787 Comm: context_switch1 Not tainted 5.4.145 #1
  RIP: 0010:unwind_next_frame
  Call Trace:
   <NMI>
   perf_callchain_kernel
   get_perf_callchain
   perf_callchain
   perf_prepare_sample
   perf_event_output_forward
   __perf_event_overflow
   perf_ibs_handle_irq
   perf_ibs_nmi_handler
   nmi_handle
   default_do_nmi
   do_nmi
   end_repeat_nmi

This was really two bugs:

  1) The perf IBS code passed inconsistent regs to the unwinder.

  2) The unwinder didn't handle the bad input gracefully.

Fix the latter bug.  The ORC unwinder needs to be immune against bad
inputs.  The problem is that stack_access_ok() doesn't recheck the
validity of the full range of registers after switching to the next
valid stack with get_stack_info().  Fix that.

[ jpoimboe: rewrote commit log ]

Signed-off-by: Dmitry Monakhov <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Peter Zijlstra <[email protected]>

arch/x86/kernel/unwind_orc.c

@@ -339,11 +339,11 @@ static bool stack_access_ok(struct unwind_state *state, unsigned long _addr,
 	struct stack_info *info = &state->stack_info;
 	void *addr = (void *)_addr;
 
-	if (!on_stack(info, addr, len) &&
-	    (get_stack_info(addr, state->task, info, &state->stack_mask)))
-		return false;
+	if (on_stack(info, addr, len))
+		return true;
 
-	return true;
+	return !get_stack_info(addr, state->task, info, &state->stack_mask) &&
+		on_stack(info, addr, len);
 }
 
 static bool deref_stack_reg(struct unwind_state *state, unsigned long addr,