Author: emaste
Date: Mon Aug 1 19:50:28 2016
New Revision: 303632
URL: https://svnweb.freebsd.org/changeset/base/303632
Log:
MFC r303338: vt: lock Giant around kbd calls in CONS_GETINFO
Note that keyboards are stored in an array and are not freed (just
"unregistered" by clearing some fields) so a race would be limited to
obtaining stale information about an unregistered keyboard.
Reported by: CTurt
Approved by: re (gjb, kib)
Modified:
stable/11/sys/dev/vt/vt_core.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/dev/vt/vt_core.c
==============================================================================
--- stable/11/sys/dev/vt/vt_core.c Mon Aug 1 19:49:42 2016
(r303631)
+++ stable/11/sys/dev/vt/vt_core.c Mon Aug 1 19:50:28 2016
(r303632)
@@ -2228,9 +2228,11 @@ skip_thunk:
return (EINVAL);
if (vw == vd->vd_curwindow) {
+ mtx_lock(&Giant);
kbd = kbd_get_keyboard(vd->vd_keyboard);
if (kbd != NULL)
vt_save_kbd_state(vw, kbd);
+ mtx_unlock(&Giant);
}
vi->m_num = vd->vd_curwindow->vw_number + 1;
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