From owner-svn-src-vendor@freebsd.org Fri Aug 3 00:47:25 2018 Return-Path: Delivered-To: svn-src-vendor@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C90921056F1C; Fri, 3 Aug 2018 00:47:25 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 7A166882BF; Fri, 3 Aug 2018 00:47:25 +0000 (UTC) (envelope-from mav@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 mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 57DE9194C0; Fri, 3 Aug 2018 00:47:25 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w730lPcR055636; Fri, 3 Aug 2018 00:47:25 GMT (envelope-from mav@FreeBSD.org) Received: (from mav@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w730lPL3055635; Fri, 3 Aug 2018 00:47:25 GMT (envelope-from mav@FreeBSD.org) Message-Id: <201808030047.w730lPL3055635@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mav set sender to mav@FreeBSD.org using -f From: Alexander Motin Date: Fri, 3 Aug 2018 00:47:25 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org Subject: svn commit: r337216 - vendor-sys/illumos/dist/common/nvpair X-SVN-Group: vendor-sys X-SVN-Commit-Author: mav X-SVN-Commit-Paths: vendor-sys/illumos/dist/common/nvpair X-SVN-Commit-Revision: 337216 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-vendor@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: SVN commit messages for the vendor work area tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Aug 2018 00:47:26 -0000 Author: mav Date: Fri Aug 3 00:47:24 2018 New Revision: 337216 URL: https://svnweb.freebsd.org/changeset/base/337216 Log: 7263 deeply nested nvlist can overflow stack illumos/illumos-gate@9ca527c3d3dfa7c8f304b34a9e03b5eddace838f Reviewed by: Adam Leventhal Reviewed by: George Wilson Reviewed by: Robert Mustacchi Approved by: Dan McDonald Author: Matthew Ahrens Modified: vendor-sys/illumos/dist/common/nvpair/nvpair.c Modified: vendor-sys/illumos/dist/common/nvpair/nvpair.c ============================================================================== --- vendor-sys/illumos/dist/common/nvpair/nvpair.c Fri Aug 3 00:24:27 2018 (r337215) +++ vendor-sys/illumos/dist/common/nvpair/nvpair.c Fri Aug 3 00:47:24 2018 (r337216) @@ -21,6 +21,7 @@ /* * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2015, 2016 by Delphix. All rights reserved. */ #include @@ -138,6 +139,11 @@ static int nvlist_add_common(nvlist_t *nvl, const char #define NVPAIR2I_NVP(nvp) \ ((i_nvp_t *)((size_t)(nvp) - offsetof(i_nvp_t, nvi_nvp))) +#ifdef _KERNEL +int nvpair_max_recursion = 20; +#else +int nvpair_max_recursion = 100; +#endif int nv_alloc_init(nv_alloc_t *nva, const nv_alloc_ops_t *nvo, /* args */ ...) @@ -2014,6 +2020,7 @@ typedef struct { const nvs_ops_t *nvs_ops; void *nvs_private; nvpriv_t *nvs_priv; + int nvs_recursion; } nvstream_t; /* @@ -2165,9 +2172,16 @@ static int nvs_embedded(nvstream_t *nvs, nvlist_t *embedded) { switch (nvs->nvs_op) { - case NVS_OP_ENCODE: - return (nvs_operation(nvs, embedded, NULL)); + case NVS_OP_ENCODE: { + int err; + if (nvs->nvs_recursion >= nvpair_max_recursion) + return (EINVAL); + nvs->nvs_recursion++; + err = nvs_operation(nvs, embedded, NULL); + nvs->nvs_recursion--; + return (err); + } case NVS_OP_DECODE: { nvpriv_t *priv; int err; @@ -2180,8 +2194,12 @@ nvs_embedded(nvstream_t *nvs, nvlist_t *embedded) nvlist_init(embedded, embedded->nvl_nvflag, priv); + if (nvs->nvs_recursion >= nvpair_max_recursion) + return (EINVAL); + nvs->nvs_recursion++; if ((err = nvs_operation(nvs, embedded, NULL)) != 0) nvlist_free(embedded); + nvs->nvs_recursion--; return (err); } default: @@ -2269,6 +2287,7 @@ nvlist_common(nvlist_t *nvl, char *buf, size_t *buflen return (EINVAL); nvs.nvs_op = nvs_op; + nvs.nvs_recursion = 0; /* * For NVS_OP_ENCODE and NVS_OP_DECODE make sure an nvlist and