Commit 3ca676e4 authored May 07, 2020 by Douglas Anderson Committed by Daniel Thompson May 18, 2020

kgdb: Prevent infinite recursive entries to the debugger

If we detect that we recursively entered the debugger we should hack
our I/O ops to NULL so that the panic() in the next line won't
actually cause another recursion into the debugger. The first line of
kgdb_panic() will check this and return.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20200507130644.v4.6.I89de39f68736c9de610e6f241e68d8dbc44bc266@changeid

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

parent b1a57bbf

kernel/debug/debug_core.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -530,6 +530,7 @@ static int kgdb_reenter_check(struct kgdb_state *ks)

		if (exception_level > 1) {
		dump_stack();
		kgdb_io_module_registered = false;
		panic("Recursive entry to debugger");
		}