From 88394b5cf39f298ebaa9a8ce4ace9bef14c2c6ee Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Wed, 10 Apr 2013 16:09:01 +1000 Subject: [PATCH] xf86: fix flush input to work with Linux evdev devices. So when we VT switch back and attempt to flush the input devices, we don't succeed because evdev won't return part of an event, since we were only asking for 4 bytes, we'd only get -EINVAL back. This could later cause events to be flushed that we shouldn't have gotten. This is a fix for CVE-2013-1940. Signed-off-by: Dave Airlie --- hw/xfree86/os-support/shared/posix_tty.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/xfree86/os-support/shared/posix_tty.c b/hw/xfree86/os-support/shared/posix_tty.c index ab3757a..4d08c1e 100644 --- a/hw/xfree86/os-support/shared/posix_tty.c +++ b/hw/xfree86/os-support/shared/posix_tty.c @@ -421,7 +421,8 @@ xf86FlushInput(int fd) { fd_set fds; struct timeval timeout; - char c[4]; + /* this needs to be big enough to flush an evdev event. */ + char c[256]; DebugF("FlushingSerial\n"); if (tcflush(fd, TCIFLUSH) == 0) -- 1.8.2