serial: do not accept sysrq characters via serial port
many embedded boards have a disconnected TTL level serial which can
generate some garbage that can lead to spurious false sysrq detects.
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index b06848a..9fa4e6e 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -416,6 +416,16 @@
This may be set to 1 or 0 to enable or disable them all, or
to a bitmask as described in Documentation/sysrq.txt.
+config MAGIC_SYSRQ_SERIAL
+ bool "Enable magic SysRq key over serial"
+ depends on MAGIC_SYSRQ
+ default y
+ help
+ Many embedded boards have a disconnected TTL level serial which can
+ generate some garbage that can lead to spurious false sysrq detects.
+ This option allows you to decide whether you want to enable the
+ magic SysRq key.
+
config DEBUG_KERNEL
bool "Kernel debugging"
help