From owner-svn-src-all@FreeBSD.ORG Fri May 23 09:48:43 2014 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 81037979; Fri, 23 May 2014 09:48:43 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 61FB927CB; Fri, 23 May 2014 09:48:43 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.8/8.14.8) with ESMTP id s4N9mhTf042543; Fri, 23 May 2014 09:48:43 GMT (envelope-from kib@svn.freebsd.org) Received: (from kib@localhost) by svn.freebsd.org (8.14.8/8.14.8/Submit) id s4N9mgbx042540; Fri, 23 May 2014 09:48:42 GMT (envelope-from kib@svn.freebsd.org) Message-Id: <201405230948.s4N9mgbx042540@svn.freebsd.org> From: Konstantin Belousov Date: Fri, 23 May 2014 09:48:42 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r266583 - in stable/8/sys: kern sys vm X-SVN-Group: stable-8 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 May 2014 09:48:43 -0000 Author: kib Date: Fri May 23 09:48:42 2014 New Revision: 266583 URL: http://svnweb.freebsd.org/changeset/base/266583 Log: MFC r266464: In execve(2), postpone the free of old vmspace until the threads are resumed and exited. Modified: stable/8/sys/kern/kern_exec.c stable/8/sys/sys/proc.h stable/8/sys/vm/vm_map.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/kern/ (props changed) stable/8/sys/sys/ (props changed) stable/8/sys/vm/ (props changed) Modified: stable/8/sys/kern/kern_exec.c ============================================================================== --- stable/8/sys/kern/kern_exec.c Fri May 23 09:29:04 2014 (r266582) +++ stable/8/sys/kern/kern_exec.c Fri May 23 09:48:42 2014 (r266583) @@ -278,6 +278,7 @@ kern_execve(td, args, mac_p) struct mac *mac_p; { struct proc *p = td->td_proc; + struct vmspace *oldvmspace; int error; AUDIT_ARG_ARGV(args->begin_argv, args->argc, @@ -294,6 +295,8 @@ kern_execve(td, args, mac_p) PROC_UNLOCK(p); } + KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0, ("nested execve")); + oldvmspace = td->td_proc->p_vmspace; error = do_execve(td, args, mac_p); if (p->p_flag & P_HADTHREADS) { @@ -308,6 +311,12 @@ kern_execve(td, args, mac_p) thread_single_end(); PROC_UNLOCK(p); } + if ((td->td_pflags & TDP_EXECVMSPC) != 0) { + KASSERT(td->td_proc->p_vmspace != oldvmspace, + ("oldvmspace still used")); + vmspace_free(oldvmspace); + td->td_pflags &= ~TDP_EXECVMSPC; + } return (error); } Modified: stable/8/sys/sys/proc.h ============================================================================== --- stable/8/sys/sys/proc.h Fri May 23 09:29:04 2014 (r266582) +++ stable/8/sys/sys/proc.h Fri May 23 09:48:42 2014 (r266583) @@ -414,6 +414,7 @@ do { \ #define TDP_AUDITREC 0x01000000 /* Audit record pending on thread */ #define TDP_RESETSPUR 0x04000000 /* Reset spurious page fault history. */ #define TDP_NERRNO 0x08000000 /* Last errno is already in td_errno */ +#define TDP_EXECVMSPC 0x40000000 /* Execve destroyed old vmspace */ /* * Reasons that the current thread can not be run yet. Modified: stable/8/sys/vm/vm_map.c ============================================================================== --- stable/8/sys/vm/vm_map.c Fri May 23 09:29:04 2014 (r266582) +++ stable/8/sys/vm/vm_map.c Fri May 23 09:48:42 2014 (r266583) @@ -3521,6 +3521,8 @@ vmspace_exec(struct proc *p, vm_offset_t struct vmspace *oldvmspace = p->p_vmspace; struct vmspace *newvmspace; + KASSERT((curthread->td_pflags & TDP_EXECVMSPC) == 0, + ("vmspace_exec recursed")); newvmspace = vmspace_alloc(minuser, maxuser); if (newvmspace == NULL) return (ENOMEM); @@ -3537,7 +3539,7 @@ vmspace_exec(struct proc *p, vm_offset_t PROC_VMSPACE_UNLOCK(p); if (p == curthread->td_proc) pmap_activate(curthread); - vmspace_free(oldvmspace); + curthread->td_pflags |= TDP_EXECVMSPC; return (0); }