timeval has trailing padding on powerpc and m88k, so memset it before

copyout to avoid leaking kernel stack

ok deraadt@

diff --git a/sys/kern/kern_sysctl.c b/sys/kern/kern_sysctl.c
index cb38823..d08767d 100644 (file)
--- a/sys/kern/kern_sysctl.c
+++ b/sys/kern/kern_sysctl.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: kern_sysctl.c,v 1.323 2017/04/05 04:00:41 deraadt Exp $       */
+/*     $OpenBSD: kern_sysctl.c,v 1.324 2017/04/05 04:15:44 guenther Exp $      */
 /*     $NetBSD: kern_sysctl.c,v 1.17 1996/05/20 17:49:05 mrg Exp $     */
 
 /*-
@@ -370,6 +370,7 @@ kern_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
                return (sysctl_clockrate(oldp, oldlenp, newp));
        case KERN_BOOTTIME: {
                struct timeval bt;
+               memset(&bt, 0, sizeof bt);
                TIMESPEC_TO_TIMEVAL(&bt, &boottime);
                return (sysctl_rdstruct(oldp, oldlenp, newp, &bt, sizeof bt));
          }