From owner-svn-src-all@freebsd.org Wed Mar 1 10:22:08 2017 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8BAC4CF317A; Wed, 1 Mar 2017 10:22:08 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::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 3D8F8BAA; Wed, 1 Mar 2017 10:22:08 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v21AM7Sn056828; Wed, 1 Mar 2017 10:22:07 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v21AM7p4056827; Wed, 1 Mar 2017 10:22:07 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201703011022.v21AM7p4056827@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Wed, 1 Mar 2017 10:22:07 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r314486 - head/sys/kern X-SVN-Group: head 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: 2.1.23 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: Wed, 01 Mar 2017 10:22:08 -0000 Author: kib Date: Wed Mar 1 10:22:07 2017 New Revision: 314486 URL: https://svnweb.freebsd.org/changeset/base/314486 Log: When deallocating the vm object in elf_map_insert() due to vm_map_insert() failure, drop the vnode lock around the call to vm_object_deallocate(). Since the deallocated object is the vm object of the vnode, we might get the vnode lock recursion there. In fact, it is almost impossible to make vm_map_insert() failing there on stock kernel. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Modified: head/sys/kern/imgact_elf.c Modified: head/sys/kern/imgact_elf.c ============================================================================== --- head/sys/kern/imgact_elf.c Wed Mar 1 09:05:12 2017 (r314485) +++ head/sys/kern/imgact_elf.c Wed Mar 1 10:22:07 2017 (r314486) @@ -422,13 +422,14 @@ __elfN(map_partial)(vm_map_t map, vm_obj } static int -__elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, - vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) +__elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object, + vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot, + int cow) { struct sf_buf *sf; vm_offset_t off; vm_size_t sz; - int error, rv; + int error, locked, rv; if (start != trunc_page(start)) { rv = __elfN(map_partial)(map, object, offset, start, @@ -480,8 +481,12 @@ __elfN(map_insert)(vm_map_t map, vm_obje rv = vm_map_insert(map, object, offset, start, end, prot, VM_PROT_ALL, cow); vm_map_unlock(map); - if (rv != KERN_SUCCESS) + if (rv != KERN_SUCCESS) { + locked = VOP_ISLOCKED(imgp->vp); + VOP_UNLOCK(imgp->vp, 0); vm_object_deallocate(object); + vn_lock(imgp->vp, locked | LK_RETRY); + } } return (rv); } else { @@ -538,7 +543,7 @@ __elfN(load_section)(struct image_params cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); - rv = __elfN(map_insert)(map, + rv = __elfN(map_insert)(imgp, map, object, file_addr, /* file offset */ map_addr, /* virtual start */ @@ -568,8 +573,8 @@ __elfN(load_section)(struct image_params /* This had damn well better be true! */ if (map_len != 0) { - rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr + - map_len, VM_PROT_ALL, 0); + rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr, + map_addr + map_len, VM_PROT_ALL, 0); if (rv != KERN_SUCCESS) { return (EINVAL); }