It is not necessary to call an external binary to clear the screen of a default
unix terminal emulator. The external call using system("clear") may be used by
an attacker to get untrusted code called with an higher privilege because
batctl has to be run as using uid 0.

Reported-by: Antonio Quartulli <redacted>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 functions.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/functions.c b/functions.c
index c78e408..1d737fa 100644
--- a/functions.c
+++ b/functions.c

@@ -184,7 +184,7 @@ open:
 	}
 
 	if (read_opt & CLR_CONT_READ)
-		system("clear");
+		printf("\033[2J\033[0;0f");
 
 read:
 	while (getline(&line_ptr, &len, fp) != -1) {

-- 
1.7.10.4