From owner-svn-src-all@FreeBSD.ORG Sun Nov 7 21:40:35 2010 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1EFE0106566B; Sun, 7 Nov 2010 21:40:35 +0000 (UTC) (envelope-from alc@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id 0D81C8FC1C; Sun, 7 Nov 2010 21:40:35 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id oA7LeYxx084698; Sun, 7 Nov 2010 21:40:34 GMT (envelope-from alc@svn.freebsd.org) Received: (from alc@localhost) by svn.freebsd.org (8.14.3/8.14.3/Submit) id oA7LeY8j084696; Sun, 7 Nov 2010 21:40:34 GMT (envelope-from alc@svn.freebsd.org) Message-Id: <201011072140.oA7LeY8j084696@svn.freebsd.org> From: Alan Cox Date: Sun, 7 Nov 2010 21:40:34 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r214953 - head/sys/vm X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 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: Sun, 07 Nov 2010 21:40:35 -0000 Author: alc Date: Sun Nov 7 21:40:34 2010 New Revision: 214953 URL: http://svn.freebsd.org/changeset/base/214953 Log: In case the stack size reaches its limit and its growth must be restricted, ensure that grow_amount is a multiple of the page size. Otherwise, the kernel may crash in swap_reserve_by_uid() on HEAD and FreeBSD 8.x, and produce a core file with a missing stack on FreeBSD 7.x. Diagnosed and reported by: jilles Reviewed by: kib MFC after: 1 week Modified: head/sys/vm/vm_map.c Modified: head/sys/vm/vm_map.c ============================================================================== --- head/sys/vm/vm_map.c Sun Nov 7 20:56:41 2010 (r214952) +++ head/sys/vm/vm_map.c Sun Nov 7 21:40:34 2010 (r214953) @@ -3338,7 +3338,8 @@ Retry: if (grow_amount > stack_entry->avail_ssize) grow_amount = stack_entry->avail_ssize; if (is_procstack && (ctob(vm->vm_ssize) + grow_amount > stacklim)) { - grow_amount = stacklim - ctob(vm->vm_ssize); + grow_amount = trunc_page((vm_size_t)stacklim) - + ctob(vm->vm_ssize); } /* If we would blow our VMEM resource limit, no go */