Date: Tue, 26 Jul 2016 15:34:26 +0000 (UTC) From: Ed Maste <emaste@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r303338 - head/sys/dev/vt Message-ID: <201607261534.u6QFYQ9L017045@repo.freebsd.org>
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Author: emaste Date: Tue Jul 26 15:34:26 2016 New Revision: 303338 URL: https://svnweb.freebsd.org/changeset/base/303338 Log: 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 MFC after: 3 days Modified: head/sys/dev/vt/vt_core.c Modified: head/sys/dev/vt/vt_core.c ============================================================================== --- head/sys/dev/vt/vt_core.c Tue Jul 26 15:22:21 2016 (r303337) +++ head/sys/dev/vt/vt_core.c Tue Jul 26 15:34:26 2016 (r303338) @@ -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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