From 563b64aeb8844146f909212725c513423bf2f3f2 Mon Sep 17 00:00:00 2001 From: Roland Kammerer Date: Tue, 26 Jul 2022 19:47:56 +0200 Subject: [PATCH] BadUSB: add SYSRQ keys This allows sending of SysRq keys[1]. This then for example allows sending the well known 'reisub' commands to safely reboot a otherwise frozen Linux box. Or obviously any of the other magic keys. The advantage compared to sending it to /proc/sysrq-trigger is that one does not need a shell and depending on how broken the system is, one might not even be able to get a new shell. The SysRq keys still work. The cost is adding a new/"non-standard" keyword, IMO it is worth it. Example: DEFAULTDELAY 200 DELAY 1000 SYSRQ r SYSRQ e SYSRQ i SYSRQ s SYSRQ u SYSRQ b If one really wants to test it, I suggest h(elp) or w(ait). [1] https://en.wikipedia.org/wiki/Magic_SysRq_key --- applications/bad_usb/bad_usb_script.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/applications/bad_usb/bad_usb_script.c b/applications/bad_usb/bad_usb_script.c index 9d9d3e39719..a63fea136a5 100644 --- a/applications/bad_usb/bad_usb_script.c +++ b/applications/bad_usb/bad_usb_script.c @@ -109,6 +109,7 @@ static const char ducky_cmd_string[] = {"STRING "}; static const char ducky_cmd_defdelay_1[] = {"DEFAULT_DELAY "}; static const char ducky_cmd_defdelay_2[] = {"DEFAULTDELAY "}; static const char ducky_cmd_repeat[] = {"REPEAT "}; +static const char ducky_cmd_sysrq[] = {"SYSRQ "}; static const char ducky_cmd_altchar[] = {"ALTCHAR "}; static const char ducky_cmd_altstr_1[] = {"ALTSTRING "}; @@ -292,6 +293,14 @@ static int32_t ducky_parse_line(BadUsbScript* bad_usb, string_t line) { line_tmp = &line_tmp[ducky_get_command_len(line_tmp) + 1]; state = ducky_get_number(line_tmp, &bad_usb->repeat_cnt); return (state) ? (0) : SCRIPT_STATE_ERROR; + } else if(strncmp(line_tmp, ducky_cmd_sysrq, strlen(ducky_cmd_sysrq)) == 0) { + // SYSRQ + line_tmp = &line_tmp[ducky_get_command_len(line_tmp) + 1]; + uint16_t key = ducky_get_keycode(line_tmp, true); + furi_hal_hid_kb_press(KEY_MOD_LEFT_ALT | HID_KEYBOARD_PRINT_SCREEN); + furi_hal_hid_kb_press(key); + furi_hal_hid_kb_release_all(); + return (0); } else { // Special keys + modifiers uint16_t key = ducky_get_keycode(line_tmp, false);