x86/dumpstack: When OOPSing, rewind the stack before do_exit()

If we call do_exit() with a clean stack, we greatly reduce the risk of
recursive oopses due to stack overflow in do_exit, and we allow
do_exit to work even if we OOPS from an IST stack.  The latter gives
us a much better chance of surviving long enough after we detect a
stack overflow to write out our logs.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/32f73ceb372ec61889598da5e5b145889b9f2e19.1468527351.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/entry/entry_32.S

@@ -1153,3 +1153,14 @@ ENTRY(async_page_fault)
 	jmp	error_code
 END(async_page_fault)
 #endif
+
+ENTRY(rewind_stack_do_exit)
+	/* Prevent any naive code from trying to unwind to our caller. */
+	xorl	%ebp, %ebp
+
+	movl	PER_CPU_VAR(cpu_current_top_of_stack), %esi
+	leal	-TOP_OF_KERNEL_STACK_PADDING-PTREGS_SIZE(%esi), %esp
+
+	call	do_exit
+1:	jmp 1b
+END(rewind_stack_do_exit)

arch/x86/entry/entry_64.S

@@ -1423,3 +1423,14 @@ ENTRY(ignore_sysret)
 	mov	$-ENOSYS, %eax
 	sysret
 END(ignore_sysret)
+
+ENTRY(rewind_stack_do_exit)
+	/* Prevent any naive code from trying to unwind to our caller. */
+	xorl	%ebp, %ebp
+
+	movq	PER_CPU_VAR(cpu_current_top_of_stack), %rax
+	leaq	-TOP_OF_KERNEL_STACK_PADDING-PTREGS_SIZE(%rax), %rsp
+
+	call	do_exit
+1:	jmp 1b
+END(rewind_stack_do_exit)

arch/x86/kernel/dumpstack.c

@@ -234,6 +234,8 @@ unsigned long oops_begin(void)
 EXPORT_SYMBOL_GPL(oops_begin);
 NOKPROBE_SYMBOL(oops_begin);
 
+void __noreturn rewind_stack_do_exit(int signr);
+
 void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
 {
 	if (regs && kexec_should_crash(current))
@@ -255,7 +257,13 @@ void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
 		panic("Fatal exception in interrupt");
 	if (panic_on_oops)
 		panic("Fatal exception");
-	do_exit(signr);
+
+	/*
+	 * We're not going to return, but we might be on an IST stack or
+	 * have very little stack space left.  Rewind the stack and kill
+	 * the task.
+	 */
+	rewind_stack_do_exit(signr);
 }
 NOKPROBE_SYMBOL(oops_end);