Commit 2975e4a2 authored by Vincent Whitchurch's avatar Vincent Whitchurch Committed by Richard Weinberger
Browse files

um: Prevent KASAN splats in dump_stack() 



Use READ_ONCE_NOCHECK() when reading the stack to prevent KASAN splats
when dump_stack() is used.

Fixes: 5b301409 ("UML: add support for KASAN under x86_64")
Signed-off-by: default avatarVincent Whitchurch <vincent.whitchurch@axis.com>
Reviewed-by: default avatarDmitry Vyukov <dvyukov@google.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 782b1f70

arch/um/kernel/sysrq.c

+2 −1
Original line number Diff line number Diff line
@@ -48,7 +48,8 @@ void show_stack(struct task_struct *task, unsigned long *stack, 
			break;

		if (i && ((i % STACKSLOTS_PER_LINE) == 0))

			pr_cont("\n");

		pr_cont(" %08lx", *stack++);

		pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));

		stack++;

	}



	printk("%sCall Trace:\n", loglvl);