41 lines
1.3 KiB
Diff
41 lines
1.3 KiB
Diff
From: John Crispin <john@phrozen.org>
|
|
Subject: 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.
|
|
|
|
[john@phrozen.org: sent upstream 22.12.2016]
|
|
|
|
Signed-off-by: John Crispin <john@phrozen.org>
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
|
---
|
|
include/linux/serial_core.h | 2 +-
|
|
lib/Kconfig.debug | 5 +++++
|
|
2 files changed, 6 insertions(+), 1 deletion(-)
|
|
|
|
--- a/include/linux/serial_core.h
|
|
+++ b/include/linux/serial_core.h
|
|
@@ -448,7 +448,7 @@ extern void uart_handle_cts_change(struc
|
|
extern void uart_insert_char(struct uart_port *port, unsigned int status,
|
|
unsigned int overrun, unsigned int ch, unsigned int flag);
|
|
|
|
-#ifdef SUPPORT_SYSRQ
|
|
+#if defined(SUPPORT_SYSRQ) && defined(CONFIG_MAGIC_SYSRQ_SERIAL)
|
|
static inline int
|
|
uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
|
|
{
|
|
--- a/lib/Kconfig.debug
|
|
+++ b/lib/Kconfig.debug
|
|
@@ -396,6 +396,11 @@ config MAGIC_SYSRQ_DEFAULT_ENABLE
|
|
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
|
|
+
|
|
config DEBUG_KERNEL
|
|
bool "Kernel debugging"
|
|
help
|