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Commit 2f9b7e08 authored by Liu, Changcheng's avatar Liu, Changcheng Committed by Linus Torvalds
Browse files

lib/nmi_backtrace.c: fix kernel text address leak 

Don't leak idle function address in NMI backtrace.

Link: http://lkml.kernel.org/r/20171106165648.GA95243@sofia


Signed-off-by: default avatarLiu Changcheng <changcheng.liu@intel.com>
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Reviewed-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 36a3d1dd

lib/nmi_backtrace.c

+2 −2
Original line number Diff line number Diff line
@@ -93,8 +93,8 @@ bool nmi_cpu_backtrace(struct pt_regs *regs) 
	if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {

		arch_spin_lock(&lock);

		if (regs && cpu_in_idle(instruction_pointer(regs))) {

			pr_warn("NMI backtrace for cpu %d skipped: idling at pc %#lx\n",

				cpu, instruction_pointer(regs));

			pr_warn("NMI backtrace for cpu %d skipped: idling at %pS\n",

				cpu, (void *)instruction_pointer(regs));

		} else {

			pr_warn("NMI backtrace for cpu %d\n", cpu);

			if (regs)