From patchwork Thu Jun 9 23:01:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 12876128 X-Patchwork-Delegate: paul@paul-moore.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA977C43334 for ; Thu, 9 Jun 2022 23:10:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345943AbiFIXKk (ORCPT ); Thu, 9 Jun 2022 19:10:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345836AbiFIXKM (ORCPT ); Thu, 9 Jun 2022 19:10:12 -0400 Received: from sonic316-27.consmr.mail.ne1.yahoo.com (sonic316-27.consmr.mail.ne1.yahoo.com [66.163.187.153]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4DA8F136C1B for ; Thu, 9 Jun 2022 16:10:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1654816207; bh=11Yl0L6BEXDtiUicAPpo8DaV+47sQMhyvYBeOsS8N3U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=q485xN6wCCfj8tFJoD3/+kpNQlVt6bvb4+gHxP4okDSnpNLrAM6woDZJyPYEbA+86WP5+u4G/5SahMykk0JTy1GlhZgfY4RRqrOwk9Cb0MAAkFN//BG7B8aIms1L80Qi5zTOKhSeOfmCdkU1VXlgiF/ShlNsUE/vnp1UYg9KiGr/BxKxD4b2XvRFIiOtxluPmgVJlBQWIhOsCrwPtbxho1Wj+Uw1A6FKXt3gwIK8ZHAR6Yd9kz8bTiHnpAZE6nLalwInCmvc0Lw5CLh6C+Q5wApf+l1vT8xKAtD0nV7mQvoy/CPmr4utdhhDhuqZF5eXtHUAIxC3ThGYExkTvaTZLg== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1654816207; bh=g/GDnGQLQhw/3Hwg4EqIRpY2DMXDEREWOOiXABwKWUx=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=d8RlmK8s68Zax15U7bKFyKg8K1vvT4Z6lB5We8SwBMTnSkaKpJayCeEN5uSICRxMlaDBiSRAE+jRdzfQBBC7lvFj6wEk1ebgWLBacHXj/RMYP7aVtNifDhiZpz1yDyGpw8kNfGDmI1uvCWZ9RSipx23dEsx+kFd5X9WxI7NTjsPA8wV/fqfpa3WDazdynDXrqmANzrOXieVXRy4gflfrecI4X4BhHrdYSZOk3eKRkiZDeG5CgPybQ+9ev46c8VnNhKyUJj70tBP0I8OZWdFNTEfZZoE5Bpw9KYa4qEIjxQ2gTCuGKv569PvSU8w3YNVprEPgcUIE9iKjhmDYpn3Hwg== X-YMail-OSG: dNeGoMMVM1mnWUs7SV5csfY6F3BEXFvmofWKqDdDsjLfSjja_IVXhw2nd4mRpuU w7wkDcQAPzMrGxLOqI94IqCDqypR14rpQBhckn9rVuF.JZvx_e2S4SGnpnEMo8geEKQML4.SWV9w 9CWzSOEJMylhjwtf8XztW0NHD9AWZOKtHwrGjYKNJALCbc5U8aoQQYX72SfBvYt4mo7KWYMaSMD. g_vcZWy..mJlVAZzu.rPvdjTM0Zk7LTfub6roan33jXiDUyipMlQODNHRfd5Pc2_hCbSJKu_cqz. ozih2nrY_GYg6AUDlKWOkuv1kPHolzkPie1EoQTbr0PcbLjA9F8JXz.nICl4n4Mf_qwZnxVbkNmk OlBn3x.6QB7.tJGDmiBuQEI7uWrUKaeTbJ.UXEVZ9nP54_A0uM.QmAH6po7MBaqmiGpCImvfqRJM hS2SFp0_muGjzFy_34PlblukAkb2rolXnJ3gaT90T71wlPSGEZgf6bz1LY5oLyIEqegtPAMj15CN QtH8c_BnWp6wI0Ekt6g9DhklQDXmUmFREsuFyCunXvtdU3Ohg0Kny32x4gzQp5jcbALZbvrXVASZ xjXx6IzT0yTdL_y4WXalA76EgPJi1K0zdlYnAF_a3keQnUWSCMVuQr7TKBM268Y8FL_7ud6xgTZT vZMi8iR1sGP5jxbIsxZeyUF6u8hTHfLCe75GwPRdLm6kJ5IGtQ3Rh16PyIAPh397uqMVGr0SGHz1 pfzXGN0Pt7_KRPLKkEU.8Riua_ZGM1MdyDpBQK9gyydRUY9uVewtBnyR7flgMyK.RKlZ.Gb2o57U 7JSjnTyJoMFRVzJoIdUqJP1M0mKiSQCWj0fuWzk7vO0tKm9j8_hOQBk2vF2ZF3lURo4ETgpaHpbp ajs9VAj9SEHtVwqiA41w_eaXED1xl5ubWgEMxq5e16yat7ztjLAyGQ3sU8L0tXa6LoyW2aFSRAcE 4Iu7dsAvUOBvP2e7TJgfCkx38WJ.VA0_GXEsF8.wjS8rT07.S4b_m5kPF17dOk2SkFrYpITgEMHz HXUz0DhhBZ_CUOltX5p_gjfVFLU1mBwaxIepXltgYaWXuK_HuZ63DlKgPKTRNug2IZEIeOmteCjf ZyAYn4Fkkuljf0rlJUbkAxnup3PUs4MCxwzdlo5A5AhPahg7DQsDT0T0sGASOtEtcBqUGKU34rIL E_0gPhOt43CJIjXx5TnwoiCDGtHKw._rc55tMfhpDyDDHhheWHM0uNc_ve7ysQBzKRosON01Cf7P JerJUQtBhf4713pKlRlpzp5gttVekzZ5eE9qiDswef93uYEcNE7n84F9C5lxGzxmrnmVSjpc3Cnj _RDyfbdSd0vb8.XvS8VyAvfd2T4mUe.GFBFq1l2y244oEOFi9cyPXa6.QKPlm5rSf1kZUUiTobsn nIKt_70Hz1635Vd3Wg0dD8xIB8ycVFCMNEwfb.jyLHIzDXbDnoN.GfU9IhbxfFYiQJ1o7VV9IA3R YUInHwMzL.CvUUA5wU1PJPzuncbnvrD1LY2uo76XJVvusFh3l9Nl61lWZSSlH5A8Hf_7GdKIvS32 m3msq35uujGR3zRwcUJIPUXdchc3CU00nabdsuFUBcDNbeUXalcIekdjbYVHqdC2TtYQzGT8qbyJ tQmwIRmsPaZjO_FJNyRII2BD2nKewGRjtjvjmTZg2pmFuQLDe8X9KkCqLaV_pR4ibiY78WYMEMHm UxK8MzhgStQKUdy120VwSfnHXR15n6scEcE9c_b8uZTMs6CHUhfpMe1b4aS0oSgglV9IY3Z8t37g M6WkjmPO6GL.MRMQTGg3EhBVnEEq6Qeh8Txv05ngz7YINa2t0qOCqBgX5qRz_39TVwiXa2pITUEK hgp5Q_s_ktXHtkx5RHn75wyHXwXeoaDChgEr8lTuwB7.SLEy.ql6nv6yMWnT6KxfABkPHASZDk4U TgDpaul0zTzuTMPL2TQI9a7EEBrptP0g.yTgCVMX3HPepWiz2kvSSb9IPPweFJL.4pb2nkUnnuiq cNYW9xIk7YECecMt63Dhm3AOOnrSPaj0bL8Y9WI1Q7isEozrGamuZULDoCfWKOUc79SlsRe.e3sf OLBggcrnd1oTVxeCeaFhTehilgxFKdFcPneUQZtHdaTpVcDEHKttbN14zdTSMdvIS1NeMurdDCWb 03tLvpw5VCFch7WE3iTzU7NhvLQRQHJ5KcNXMRcb9m0dfrm1W35AcB9dT8huOH6avolgqVBV.5eQ w9svRzHAWYcde6mxT3_jOvUp6Bc5xaODXnn_6WuRHjhKvtAe_IQOUwtjEsO1v95f3KBuQcc7imWO csvdRsNU6thvR7xZmnKuzn9xyo6i_yg-- X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic316.consmr.mail.ne1.yahoo.com with HTTP; Thu, 9 Jun 2022 23:10:07 +0000 Received: by hermes--canary-production-ne1-799d7bd497-7z8w4 (Yahoo Inc. Hermes SMTP Server) with ESMTPA ID 62296d5a5fc11a6b88291aff65d8e04f; Thu, 09 Jun 2022 23:10:02 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, linux-audit@redhat.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org Subject: [PATCH v36 16/33] LSM: Use lsmcontext in security_secid_to_secctx Date: Thu, 9 Jun 2022 16:01:29 -0700 Message-Id: <20220609230146.319210-17-casey@schaufler-ca.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220609230146.319210-1-casey@schaufler-ca.com> References: <20220609230146.319210-1-casey@schaufler-ca.com> MIME-Version: 1.0 Precedence: bulk List-ID: Replace the (secctx,seclen) pointer pair with a single lsmcontext pointer to allow return of the LSM identifier along with the context and context length. This allows security_release_secctx() to know how to release the context. Callers have been modified to use or save the returned data from the new structure. security_secid_to_secctx() will now return the length value if the passed lsmcontext pointer is NULL. Signed-off-by: Casey Schaufler Cc: netdev@vger.kernel.org Cc: linux-audit@redhat.com Cc: netfilter-devel@vger.kernel.org --- drivers/android/binder.c | 26 ++++++--------- include/linux/security.h | 4 +-- include/net/scm.h | 9 ++---- kernel/audit.c | 42 +++++++++++-------------- kernel/auditsc.c | 31 +++++++----------- net/ipv4/ip_sockglue.c | 8 ++--- net/netfilter/nf_conntrack_netlink.c | 18 ++++------- net/netfilter/nf_conntrack_standalone.c | 7 ++--- net/netfilter/nfnetlink_queue.c | 5 ++- net/netlabel/netlabel_unlabeled.c | 40 +++++++---------------- net/netlabel/netlabel_user.c | 7 ++--- security/security.c | 29 +++++++++++++++-- 12 files changed, 99 insertions(+), 127 deletions(-) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 9c1ed7fbda87..8ae1a624cd37 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2781,9 +2781,7 @@ static void binder_transaction(struct binder_proc *proc, binder_size_t last_fixup_min_off = 0; struct binder_context *context = proc->context; int t_debug_id = atomic_inc_return(&binder_last_id); - char *secctx = NULL; - u32 secctx_sz = 0; - struct lsmcontext scaff; /* scaffolding */ + struct lsmcontext lsmctx = { }; struct list_head sgc_head; struct list_head pf_head; const void __user *user_buffer = (const void __user *) @@ -3059,7 +3057,7 @@ static void binder_transaction(struct binder_proc *proc, size_t added_size; security_cred_getsecid(proc->cred, &blob); - ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz); + ret = security_secid_to_secctx(&blob, &lsmctx); if (ret) { binder_txn_error("%d:%d failed to get security context\n", thread->pid, proc->pid); @@ -3068,7 +3066,7 @@ static void binder_transaction(struct binder_proc *proc, return_error_line = __LINE__; goto err_get_secctx_failed; } - added_size = ALIGN(secctx_sz, sizeof(u64)); + added_size = ALIGN(lsmctx.len, sizeof(u64)); extra_buffers_size += added_size; if (extra_buffers_size < added_size) { binder_txn_error("%d:%d integer overflow of extra_buffers_size\n", @@ -3102,24 +3100,22 @@ static void binder_transaction(struct binder_proc *proc, t->buffer = NULL; goto err_binder_alloc_buf_failed; } - if (secctx) { + if (lsmctx.context) { int err; size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) + ALIGN(tr->offsets_size, sizeof(void *)) + ALIGN(extra_buffers_size, sizeof(void *)) - - ALIGN(secctx_sz, sizeof(u64)); + ALIGN(lsmctx.len, sizeof(u64)); t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset; err = binder_alloc_copy_to_buffer(&target_proc->alloc, t->buffer, buf_offset, - secctx, secctx_sz); + lsmctx.context, lsmctx.len); if (err) { t->security_ctx = 0; WARN_ON(1); } - lsmcontext_init(&scaff, secctx, secctx_sz, 0); - security_release_secctx(&scaff); - secctx = NULL; + security_release_secctx(&lsmctx); } t->buffer->debug_id = t->debug_id; t->buffer->transaction = t; @@ -3163,7 +3159,7 @@ static void binder_transaction(struct binder_proc *proc, off_end_offset = off_start_offset + tr->offsets_size; sg_buf_offset = ALIGN(off_end_offset, sizeof(void *)); sg_buf_end_offset = sg_buf_offset + extra_buffers_size - - ALIGN(secctx_sz, sizeof(u64)); + ALIGN(lsmctx.len, sizeof(u64)); off_min = 0; for (buffer_offset = off_start_offset; buffer_offset < off_end_offset; buffer_offset += sizeof(binder_size_t)) { @@ -3534,10 +3530,8 @@ static void binder_transaction(struct binder_proc *proc, binder_alloc_free_buf(&target_proc->alloc, t->buffer); err_binder_alloc_buf_failed: err_bad_extra_size: - if (secctx) { - lsmcontext_init(&scaff, secctx, secctx_sz, 0); - security_release_secctx(&scaff); - } + if (lsmctx.context) + security_release_secctx(&lsmctx); err_get_secctx_failed: kfree(tcomplete); binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); diff --git a/include/linux/security.h b/include/linux/security.h index a20fc156c697..5afd0148a1a5 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -617,7 +617,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value, size_t size); int security_netlink_send(struct sock *sk, struct sk_buff *skb); int security_ismaclabel(const char *name); -int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen); +int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp); int security_secctx_to_secid(const char *secdata, u32 seclen, struct lsmblob *blob); void security_release_secctx(struct lsmcontext *cp); @@ -1472,7 +1472,7 @@ static inline int security_ismaclabel(const char *name) } static inline int security_secid_to_secctx(struct lsmblob *blob, - char **secdata, u32 *seclen) + struct lsmcontext *cp) { return -EOPNOTSUPP; } diff --git a/include/net/scm.h b/include/net/scm.h index f273c4d777ec..b77a52f93389 100644 --- a/include/net/scm.h +++ b/include/net/scm.h @@ -94,8 +94,6 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc { struct lsmcontext context; struct lsmblob lb; - char *secdata; - u32 seclen; int err; if (test_bit(SOCK_PASSSEC, &sock->flags)) { @@ -103,12 +101,11 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc * and the infrastructure will know which it is. */ lsmblob_init(&lb, scm->secid); - err = security_secid_to_secctx(&lb, &secdata, &seclen); + err = security_secid_to_secctx(&lb, &context); if (!err) { - put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); - /*scaffolding*/ - lsmcontext_init(&context, secdata, seclen, 0); + put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, context.len, + context.context); security_release_secctx(&context); } } diff --git a/kernel/audit.c b/kernel/audit.c index 0eff57959b4e..a885ebdbb91e 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1212,9 +1212,6 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) struct audit_buffer *ab; u16 msg_type = nlh->nlmsg_type; struct audit_sig_info *sig_data; - char *ctx = NULL; - u32 len; - struct lsmcontext scaff; /* scaffolding */ err = audit_netlink_ok(skb, msg_type); if (err) @@ -1462,33 +1459,33 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) kfree(new); break; } - case AUDIT_SIGNAL_INFO: - len = 0; + case AUDIT_SIGNAL_INFO: { + struct lsmcontext context = { }; + if (lsmblob_is_set(&audit_sig_lsm)) { - err = security_secid_to_secctx(&audit_sig_lsm, &ctx, - &len); + err = security_secid_to_secctx(&audit_sig_lsm, + &context); if (err) return err; } - sig_data = kmalloc(struct_size(sig_data, ctx, len), GFP_KERNEL); + sig_data = kmalloc(struct_size(sig_data, ctx, context.len), + GFP_KERNEL); if (!sig_data) { - if (lsmblob_is_set(&audit_sig_lsm)) { - lsmcontext_init(&scaff, ctx, len, 0); - security_release_secctx(&scaff); - } + if (lsmblob_is_set(&audit_sig_lsm)) + security_release_secctx(&context); return -ENOMEM; } sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid); sig_data->pid = audit_sig_pid; if (lsmblob_is_set(&audit_sig_lsm)) { - memcpy(sig_data->ctx, ctx, len); - lsmcontext_init(&scaff, ctx, len, 0); - security_release_secctx(&scaff); + memcpy(sig_data->ctx, context.context, context.len); + security_release_secctx(&context); } - audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0, - sig_data, struct_size(sig_data, ctx, len)); + audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0, sig_data, + struct_size(sig_data, ctx, context.len)); kfree(sig_data); break; + } case AUDIT_TTY_GET: { struct audit_tty_status s; unsigned int t; @@ -2171,17 +2168,15 @@ void audit_log_key(struct audit_buffer *ab, char *key) int audit_log_task_context(struct audit_buffer *ab) { - char *ctx = NULL; - unsigned len; int error; struct lsmblob blob; - struct lsmcontext scaff; /* scaffolding */ + struct lsmcontext context; security_current_getsecid_subj(&blob); if (!lsmblob_is_set(&blob)) return 0; - error = security_secid_to_secctx(&blob, &ctx, &len); + error = security_secid_to_secctx(&blob, &context); if (error) { if (error != -EINVAL) @@ -2189,9 +2184,8 @@ int audit_log_task_context(struct audit_buffer *ab) return 0; } - audit_log_format(ab, " subj=%s", ctx); - lsmcontext_init(&scaff, ctx, len, 0); - security_release_secctx(&scaff); + audit_log_format(ab, " subj=%s", context.context); + security_release_secctx(&context); return 0; error_path: diff --git a/kernel/auditsc.c b/kernel/auditsc.c index cc902c9df77f..8551ce71e6c9 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1121,9 +1121,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid, struct lsmblob *blob, char *comm) { struct audit_buffer *ab; - struct lsmcontext lsmcxt; - char *ctx = NULL; - u32 len; + struct lsmcontext lsmctx; int rc = 0; ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); @@ -1134,13 +1132,12 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid, from_kuid(&init_user_ns, auid), from_kuid(&init_user_ns, uid), sessionid); if (lsmblob_is_set(blob)) { - if (security_secid_to_secctx(blob, &ctx, &len)) { + if (security_secid_to_secctx(blob, &lsmctx)) { audit_log_format(ab, " obj=(none)"); rc = 1; } else { - audit_log_format(ab, " obj=%s", ctx); - lsmcontext_init(&lsmcxt, ctx, len, 0); /*scaffolding*/ - security_release_secctx(&lsmcxt); + audit_log_format(ab, " obj=%s", lsmctx.context); + security_release_secctx(&lsmctx); } } audit_log_format(ab, " ocomm="); @@ -1400,7 +1397,6 @@ static void audit_log_time(struct audit_context *context, struct audit_buffer ** static void show_special(struct audit_context *context, int *call_panic) { - struct lsmcontext lsmcxt; struct audit_buffer *ab; int i; @@ -1425,17 +1421,15 @@ static void show_special(struct audit_context *context, int *call_panic) from_kgid(&init_user_ns, context->ipc.gid), context->ipc.mode); if (osid) { - char *ctx = NULL; - u32 len; + struct lsmcontext lsmcxt; struct lsmblob blob; lsmblob_init(&blob, osid); - if (security_secid_to_secctx(&blob, &ctx, &len)) { + if (security_secid_to_secctx(&blob, &lsmcxt)) { audit_log_format(ab, " osid=%u", osid); *call_panic = 1; } else { - audit_log_format(ab, " obj=%s", ctx); - lsmcontext_init(&lsmcxt, ctx, len, 0); + audit_log_format(ab, " obj=%s", lsmcxt.context); security_release_secctx(&lsmcxt); } } @@ -1595,20 +1589,17 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n, MAJOR(n->rdev), MINOR(n->rdev)); if (n->osid != 0) { - char *ctx = NULL; - u32 len; struct lsmblob blob; - struct lsmcontext lsmcxt; + struct lsmcontext lsmctx; lsmblob_init(&blob, n->osid); - if (security_secid_to_secctx(&blob, &ctx, &len)) { + if (security_secid_to_secctx(&blob, &lsmctx)) { audit_log_format(ab, " osid=%u", n->osid); if (call_panic) *call_panic = 2; } else { - audit_log_format(ab, " obj=%s", ctx); - lsmcontext_init(&lsmcxt, ctx, len, 0); /* scaffolding */ - security_release_secctx(&lsmcxt); + audit_log_format(ab, " obj=%s", lsmctx.context); + security_release_secctx(&lsmctx); } } diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 70ca4510ea35..ad5be7707bca 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -132,8 +132,7 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) { struct lsmcontext context; struct lsmblob lb; - char *secdata; - u32 seclen, secid; + u32 secid; int err; err = security_socket_getpeersec_dgram(NULL, skb, &secid); @@ -141,12 +140,11 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) return; lsmblob_init(&lb, secid); - err = security_secid_to_secctx(&lb, &secdata, &seclen); + err = security_secid_to_secctx(&lb, &context); if (err) return; - put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); - lsmcontext_init(&context, secdata, seclen, 0); /* scaffolding */ + put_cmsg(msg, SOL_IP, SCM_SECURITY, context.len, context.context); security_release_secctx(&context); } diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index da36301e2185..8bd6ce5f9e93 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -345,8 +345,7 @@ static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct) static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) { struct nlattr *nest_secctx; - int len, ret; - char *secctx; + int ret; struct lsmblob blob; struct lsmcontext context; @@ -354,7 +353,7 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) * security_secid_to_secctx() will know which security module * to use to create the secctx. */ lsmblob_init(&blob, ct->secmark); - ret = security_secid_to_secctx(&blob, &secctx, &len); + ret = security_secid_to_secctx(&blob, &context); if (ret) return 0; @@ -363,13 +362,12 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) if (!nest_secctx) goto nla_put_failure; - if (nla_put_string(skb, CTA_SECCTX_NAME, secctx)) + if (nla_put_string(skb, CTA_SECCTX_NAME, context.context)) goto nla_put_failure; nla_nest_end(skb, nest_secctx); ret = 0; nla_put_failure: - lsmcontext_init(&context, secctx, len, 0); /* scaffolding */ security_release_secctx(&context); return ret; } @@ -662,15 +660,11 @@ static inline size_t ctnetlink_acct_size(const struct nf_conn *ct) static inline int ctnetlink_secctx_size(const struct nf_conn *ct) { #ifdef CONFIG_NF_CONNTRACK_SECMARK - int len, ret; + int len; struct lsmblob blob; - /* lsmblob_init() puts ct->secmark into all of the secids in blob. - * security_secid_to_secctx() will know which security module - * to use to create the secctx. */ - lsmblob_init(&blob, ct->secmark); - ret = security_secid_to_secctx(&blob, NULL, &len); - if (ret) + len = security_secid_to_secctx(&blob, NULL); + if (len <= 0) return 0; return nla_total_size(0) /* CTA_SECCTX */ diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c index 644dec6a8ef5..5003acf79794 100644 --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -176,19 +176,16 @@ static void ct_seq_stop(struct seq_file *s, void *v) static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) { int ret; - u32 len; - char *secctx; struct lsmblob blob; struct lsmcontext context; lsmblob_init(&blob, ct->secmark); - ret = security_secid_to_secctx(&blob, &secctx, &len); + ret = security_secid_to_secctx(&blob, &context); if (ret) return; - seq_printf(s, "secctx=%s ", secctx); + seq_printf(s, "secctx=%s ", context.context); - lsmcontext_init(&context, secctx, len, 0); /* scaffolding */ security_release_secctx(&context); } #else diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index f69d5e997da2..35c3cde6bacd 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -306,6 +306,7 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) u32 seclen = 0; #if IS_ENABLED(CONFIG_NETWORK_SECMARK) struct lsmblob blob; + struct lsmcontext context = { }; if (!skb || !sk_fullsock(skb->sk)) return 0; @@ -317,10 +318,12 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) * blob. security_secid_to_secctx() will know which security * module to use to create the secctx. */ lsmblob_init(&blob, skb->secmark); - security_secid_to_secctx(&blob, secdata, &seclen); + security_secid_to_secctx(&blob, &context); + *secdata = context.context; } read_unlock_bh(&skb->sk->sk_callback_lock); + seclen = context.len; #endif return seclen; } diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c index b3e3d920034d..12e5d508bd08 100644 --- a/net/netlabel/netlabel_unlabeled.c +++ b/net/netlabel/netlabel_unlabeled.c @@ -375,8 +375,6 @@ int netlbl_unlhsh_add(struct net *net, struct netlbl_unlhsh_iface *iface; struct audit_buffer *audit_buf = NULL; struct lsmcontext context; - char *secctx = NULL; - u32 secctx_len; struct lsmblob blob; if (addr_len != sizeof(struct in_addr) && @@ -444,12 +442,9 @@ int netlbl_unlhsh_add(struct net *net, * security_secid_to_secctx() will know which security module * to use to create the secctx. */ lsmblob_init(&blob, secid); - if (security_secid_to_secctx(&blob, - &secctx, - &secctx_len) == 0) { - audit_log_format(audit_buf, " sec_obj=%s", secctx); - /* scaffolding */ - lsmcontext_init(&context, secctx, secctx_len, 0); + if (security_secid_to_secctx(&blob, &context) == 0) { + audit_log_format(audit_buf, " sec_obj=%s", + context.context); security_release_secctx(&context); } audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); @@ -482,8 +477,6 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, struct audit_buffer *audit_buf; struct net_device *dev; struct lsmcontext context; - char *secctx; - u32 secctx_len; struct lsmblob blob; spin_lock(&netlbl_unlhsh_lock); @@ -509,11 +502,9 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, if (entry != NULL) lsmblob_init(&blob, entry->secid); if (entry != NULL && - security_secid_to_secctx(&blob, - &secctx, &secctx_len) == 0) { - audit_log_format(audit_buf, " sec_obj=%s", secctx); - /* scaffolding */ - lsmcontext_init(&context, secctx, secctx_len, 0); + security_secid_to_secctx(&blob, &context) == 0) { + audit_log_format(audit_buf, " sec_obj=%s", + context.context); security_release_secctx(&context); } audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); @@ -552,8 +543,6 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, struct audit_buffer *audit_buf; struct net_device *dev; struct lsmcontext context; - char *secctx; - u32 secctx_len; struct lsmblob blob; spin_lock(&netlbl_unlhsh_lock); @@ -578,10 +567,9 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, if (entry != NULL) lsmblob_init(&blob, entry->secid); if (entry != NULL && - security_secid_to_secctx(&blob, - &secctx, &secctx_len) == 0) { - audit_log_format(audit_buf, " sec_obj=%s", secctx); - lsmcontext_init(&context, secctx, secctx_len, 0); + security_secid_to_secctx(&blob, &context) == 0) { + audit_log_format(audit_buf, " sec_obj=%s", + context.context); security_release_secctx(&context); } audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); @@ -1104,8 +1092,6 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, struct lsmcontext context; void *data; u32 secid; - char *secctx; - u32 secctx_len; struct lsmblob blob; data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid, @@ -1165,15 +1151,13 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, * security_secid_to_secctx() will know which security module * to use to create the secctx. */ lsmblob_init(&blob, secid); - ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len); + ret_val = security_secid_to_secctx(&blob, &context); if (ret_val != 0) goto list_cb_failure; ret_val = nla_put(cb_arg->skb, NLBL_UNLABEL_A_SECCTX, - secctx_len, - secctx); - /* scaffolding */ - lsmcontext_init(&context, secctx, secctx_len, 0); + context.len, + context.context); security_release_secctx(&context); if (ret_val != 0) goto list_cb_failure; diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c index ef139d8ae7cd..951ba0639d20 100644 --- a/net/netlabel/netlabel_user.c +++ b/net/netlabel/netlabel_user.c @@ -85,8 +85,6 @@ struct audit_buffer *netlbl_audit_start_common(int type, { struct audit_buffer *audit_buf; struct lsmcontext context; - char *secctx; - u32 secctx_len; struct lsmblob blob; if (audit_enabled == AUDIT_OFF) @@ -102,9 +100,8 @@ struct audit_buffer *netlbl_audit_start_common(int type, lsmblob_init(&blob, audit_info->secid); if (audit_info->secid != 0 && - security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { - audit_log_format(audit_buf, " subj=%s", secctx); - lsmcontext_init(&context, secctx, secctx_len, 0);/*scaffolding*/ + security_secid_to_secctx(&blob, &context) == 0) { + audit_log_format(audit_buf, " subj=%s", context.context); security_release_secctx(&context); } diff --git a/security/security.c b/security/security.c index e434f085afab..b52c7c55a092 100644 --- a/security/security.c +++ b/security/security.c @@ -2337,18 +2337,41 @@ int security_ismaclabel(const char *name) } EXPORT_SYMBOL(security_ismaclabel); -int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen) +/** + * security_secid_to_secctx - convert secid to secctx + * @blob: set of secids + * @cp: lsm context into which result is put + * + * Translate secid information into a secctx string. + * Return a negative value on error. + * If cp is NULL return the length of the string. + * Otherwise, return 0. + */ +int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp) { struct security_hook_list *hp; int ilsm = lsm_task_ilsm(current); + if (cp) + memset(cp, 0, sizeof(*cp)); + hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) { if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) continue; - if (ilsm == LSMBLOB_INVALID || ilsm == hp->lsmid->slot) + if (ilsm == LSMBLOB_INVALID || ilsm == hp->lsmid->slot) { + if (!cp) { + int len; + int rc; + rc = hp->hook.secid_to_secctx( + blob->secid[hp->lsmid->slot], + NULL, &len); + return rc ? rc : len; + } + cp->slot = hp->lsmid->slot; return hp->hook.secid_to_secctx( blob->secid[hp->lsmid->slot], - secdata, seclen); + &cp->context, &cp->len); + } } return LSM_RET_DEFAULT(secid_to_secctx);