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Disable PTRACE_FORK for vforked() children, because the parent is waiting

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and will not receive the SIGTRAP in time.
This commit is contained in:
christos 2012-02-02 02:44:06 +00:00
parent e253ed8e30
commit bccc78a590
1 changed files with 7 additions and 3 deletions
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10
sys/kern/kern_fork.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_fork.c,v 1.186 2011/09/02 20:06:29 christos Exp $ */
/* $NetBSD: kern_fork.c,v 1.187 2012/02/02 02:44:06 christos Exp $ */
/*-
* Copyright (c) 1999, 2001, 2004, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_fork.c,v 1.186 2011/09/02 20:06:29 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_fork.c,v 1.187 2012/02/02 02:44:06 christos Exp $");
#include "opt_ktrace.h"
@ -460,8 +460,12 @@ fork1(struct lwp *l1, int flags, int exitsig, void *stack, size_t stacksize,
LIST_INSERT_HEAD(&parent->p_children, p2, p_sibling);
p2->p_exitsig = exitsig; /* signal for parent on exit */
/*
* We don't want to tracefork vfork()ed processes because they
* will not receive the SIGTRAP until it is too late.
*/
tracefork = (p1->p_slflag & (PSL_TRACEFORK|PSL_TRACED)) ==
(PSL_TRACEFORK|PSL_TRACED);
(PSL_TRACEFORK|PSL_TRACED) && (flags && FORK_PPWAIT) == 0;
if (tracefork) {
p2->p_slflag |= PSL_TRACED;
p2->p_opptr = p2->p_pptr;