From patchwork Wed Nov 24 01:43:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 12635751 X-Patchwork-Delegate: kuba@kernel.org 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 02E88C433F5 for ; Wed, 24 Nov 2021 02:00:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239830AbhKXCDV (ORCPT ); Tue, 23 Nov 2021 21:03:21 -0500 Received: from sonic302-26.consmr.mail.ne1.yahoo.com ([66.163.186.152]:35295 "EHLO sonic302-26.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239742AbhKXCDU (ORCPT ); Tue, 23 Nov 2021 21:03:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1637719211; bh=LIR7IJw8T+x6DrfrqDIrkMhlikVn9ymWzPpYTj2lKKo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=aJWKq8VebWEYg/PkaK5WlyaGiDVAQ7NYD7eoGAocsdoyz4Hzr2dhyjOyp7OdO1dX62ePmsDcLmMZ5x1/rEoRp2PndA9ZHs2PjH4FRX4AcdDeiqVDpTsIZsfHMHugOQS3wI4WLpxxOvUbvFhxf3Zv+xhIzZW+675RgPNjpH760736AlLDBkYk3R7e2MKJ22TnsS7cBDW7CVjLVqFSs/KA62CkUEYpgUyQSTsvdueUTZ1D6dHwgqdGazGhMhFiQs6EeobGM4gzXsPGxgwGqzdgbPbmKEbXBPk8mHEZ8i/Mrz8H9IcuOfTWLXP+ewSsSHgADpwybpY645/rjQY19nV1iA== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1637719211; bh=34Msmpgwye2XlUVHBKdPvOxepkEtgZbJlkYOHboI9pZ=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=r6CcbetnsMJ/WAyaQgzH4eNxvpMgLCno5BQSnAHNOejSOylOiNfvef9ZQoAx/y/e3Dlqbqtp6lkUs8tfEJCt8AkT5eAMpDLOOjXX2ZSTbPaMpXeomPDoXit9pf/Xhp9b3S0zdlUCVNSMxIcqg61HcwqdBAFhschj0XCLsH7n+Dp8N3X0fE5N182KSYbNOST7cdchS/9exm7a8Lmp2nsYRPRyyTqLqlxlT+bmPXyKv03mwQCazkornfA/6A4b9htICJq7OBSR1+z8MGtNS3Z29oGc3QRld+8gNUqrfAAUwj40ihjX6ogD0Dc9hAbIYMVIUPn7Kz21zrSXgIX1jH98Og== X-YMail-OSG: bH3grpYVM1lwnuS2O_8A1C6_Vhp5jVacAcKYtMrw56uCDzhDYTSIOQFIhcaaMM7 BSimMPY_rhL9DQq8_oPBs0HQL_njN9hP.oRRS6i7EynqUwSqSs33.uQZp1DZBJwvRC4G3buCV31q F6c0wK8ksKG1PZV8O.a2F.ZEoFxaVSsRrfujYSqhcJsTrYtmZjhB4jNf9Pmr7WRYpNa9LWqjyWLG 5fTjQKENmPfPAchFNhVe19oHGQoFvVXeQLrN8rGgCyupEvMQUjV1Jbv.yfu7gL_CZ6nJXiDUP_JX 8Ys.vAYTy1X4p7FLCUR6HFvZpnI7C5Z8xMc_ZjHgs7RmxrEar5LJ6e5gALoLi0w1xQx1d1shG0rB Rf6Q_ZrgdFu5N6RHQW3vruhl3ENCLe_ZxMud8XO35A_TqGinJtDa43O.OUaM2zEaj0Q2nk30Pzhu TzoqoWSM.Bmq6JT2oJxkbNNxOETK0ycSwcDIXj9Z5Mak5OFFuCP2O4j74wE3hpBlkYpboj7W8G1. 1kX1HNjBIbDCa_2KDoTHxga8bfQKExz3LojS5Ohbx2EqmMWHvYNVP6zbpdBh4TJAqnnYnKWWH5sT g2a17AxC9KjfquTjuHzRJAW_dvodRyzb.oew1HKrc4CALuNOubXJk3dgy_9bHmoqYHqqFtM9cGFG Cz4HLBuWw2Rwf4HFCcKhsoO63m0zszsFy.7tpSZzo1_DuU4G_._.rAhm0Ub4j7v3MnOpTPpgGRkw ZRZpxN3TSWmfljPIM3GVeRYfUxzfC8K3fHmiED7K1kElN8uyfkjCwc6EhRiUoECDZqHBljB0jHoc fpnl4ZkEQmSD4.j5lPVRezjtQVRY99u_F2sZYHhoNFviRnx0DRGvN74HRbslGa.tL1ZES438lC36 xkXnkO6BCBiUb2KVDSDHSOt3hC3v77_jFbzWVCB_Mo27hqZTbvmt5bacxW_4HXL.7v.P4HulTMet 6w6DdqgOE.RS.3aFjbyqgu7.Fu72WQZxuNNfeU.NGnLmU0e3psMw3NfgpIOsCmZupHcoWE74f.EY fAupJrptNnpNr9.8SjHB8nmxdNZ80KlTGIR0NV1ULJjeN5cUOK_co43ozo7FvgTTynjnBMBOCAsM 0XPZLUlx8niCKk7ZeO10lfkIwNykBzxTCVa717OYi72VG4HTYEtnDtwNAh85vF.rQWHFeK8xmwkx OXqDaiClPM2vba5jCvOps_b6M_Al9kd_fonzvGUiS19mezkSQfOmIskj6AtO1m2jBlaeefLa5nuY Qp13W6snhtuLqXCM1MvKO49RLlQrH42W73JIjmqXyyjgsAcZFhzzBJG8Ki1MthFbUr5Xg75EbrL2 TE0OXW0.gOUdojZwtposZj2DXH0aVhngN2riICZBa7UiI5yQSQUQ3y.ydgNCW6r4i69TPBH.ufR7 _TJ6D2iUOXL5to3wCBKl5aLDkOq1hMduQ9Mb8wlZYTdqI7AppM424couMIMuJ1Qqbwmd.Ve34UUy vT9Dxrjw7lPH6obO3OgQQ9VV5oWGz1i1I4jiOC5f6mbxCODPLO6WGYYNc.eeGUUL._vwMjRa4tyq UbNGXvar92kIa1oOxW6XQxuAnPR1noofW_Q_yMioRnw0qT1ycI_LpuGYplflYWlXpgoNxRfbgIOH hwBDiZgKIVQowA4WnRmy58V1uv.NtlAZ1ryPnzHfw1HfpmSlQs8PyysDyRx0ymhHVSrVwYAB8Xcd KLqrvi4xnpVPk2DHpKMA7K5u7pbG1GBTe_NL._L9GQuVGem7WcJJoNEjoy5c1nzZHiLVeWqMZal2 Rl4LrSRfLsZn5hKLhXWarxu6X3CmEHUtzgk_ys2oEIg5.iD6t6KSFPvVbS5ooyyI1FNZBRV24g3r neO.XcrHv9pORakVznumv_d7uZ7EGOxrthY4.C9gKcaIdmO3LYJVcMwjrTFEkp4JTGMPH.RSM2QC Jh56GWo6sCJ6VKZjMO418zfXt3IatTadw14G6OUt2kiK.QVBhfqsNaDufJy6SllLEW_4Ru8G3KKQ o8TJzdZpXyh5R0CMng0VwbN0TBc1EjcqNsSZNWHIPMqg8laBKyBZwAy547T59oKOEmVnQGODyqlN LmGcHVpVpu3aGVyNWtYXH6eQLO4wevPDaH2GWM5PxKzOTjXoV8MzA8Q_4jvlnLwFsrm35oB.tF7n _aZ8fQmYWjY6hGpadG5TTtqWFHL8Dowi1y0fJ5ubxgqqI.m0sPeX6Wn90q8vf8SHkb2CZFBQ5I0E KomiVh3lkdPuMHqqgglAVnEhJ2A2HYZJkE3ROJ37lwSoyv4myvGPDdFtXXNuT._SMnb9h1gplpRc ksHmO_XbADIIbtulHovbz5X.xCkA4w2JXhF_7.QT7sByAew-- X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic302.consmr.mail.ne1.yahoo.com with HTTP; Wed, 24 Nov 2021 02:00:11 +0000 Received: by kubenode542.mail-prod1.omega.gq1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 71de488fbfe39b53bec47b0dde9f2e8e; Wed, 24 Nov 2021 02:00:07 +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, sds@tycho.nsa.gov, linux-kernel@vger.kernel.org, Stephen Smalley , Chuck Lever , linux-integrity@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, linux-nfs@vger.kernel.org Subject: [PATCH v30 15/28] LSM: Ensure the correct LSM context releaser Date: Tue, 23 Nov 2021 17:43:19 -0800 Message-Id: <20211124014332.36128-16-casey@schaufler-ca.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211124014332.36128-1-casey@schaufler-ca.com> References: <20211124014332.36128-1-casey@schaufler-ca.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Add a new lsmcontext data structure to hold all the information about a "security context", including the string, its size and which LSM allocated the string. The allocation information is necessary because LSMs have different policies regarding the lifecycle of these strings. SELinux allocates and destroys them on each use, whereas Smack provides a pointer to an entry in a list that never goes away. Reviewed-by: Kees Cook Reviewed-by: John Johansen Acked-by: Paul Moore Acked-by: Stephen Smalley Acked-by: Chuck Lever Signed-off-by: Casey Schaufler Cc: linux-integrity@vger.kernel.org Cc: netdev@vger.kernel.org Cc: linux-audit@redhat.com Cc: netfilter-devel@vger.kernel.org To: Pablo Neira Ayuso Cc: linux-nfs@vger.kernel.org --- drivers/android/binder.c | 10 ++++--- fs/ceph/xattr.c | 6 ++++- fs/nfs/nfs4proc.c | 8 ++++-- fs/nfsd/nfs4xdr.c | 7 +++-- include/linux/security.h | 35 +++++++++++++++++++++++-- include/net/scm.h | 5 +++- kernel/audit.c | 14 +++++++--- kernel/auditsc.c | 12 ++++++--- net/ipv4/ip_sockglue.c | 4 ++- net/netfilter/nf_conntrack_netlink.c | 4 ++- net/netfilter/nf_conntrack_standalone.c | 4 ++- net/netfilter/nfnetlink_queue.c | 13 ++++++--- net/netlabel/netlabel_unlabeled.c | 19 +++++++++++--- net/netlabel/netlabel_user.c | 4 ++- security/security.c | 11 ++++---- 15 files changed, 121 insertions(+), 35 deletions(-) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 2be77ae9ca52..de8f0661e8ec 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2469,6 +2469,7 @@ static void binder_transaction(struct binder_proc *proc, int t_debug_id = atomic_inc_return(&binder_last_id); char *secctx = NULL; u32 secctx_sz = 0; + struct lsmcontext scaff; /* scaffolding */ e = binder_transaction_log_add(&binder_transaction_log); e->debug_id = t_debug_id; @@ -2771,7 +2772,8 @@ static void binder_transaction(struct binder_proc *proc, t->security_ctx = 0; WARN_ON(1); } - security_release_secctx(secctx, secctx_sz); + lsmcontext_init(&scaff, secctx, secctx_sz, 0); + security_release_secctx(&scaff); secctx = NULL; } t->buffer->debug_id = t->debug_id; @@ -3112,8 +3114,10 @@ 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) - security_release_secctx(secctx, secctx_sz); + if (secctx) { + lsmcontext_init(&scaff, secctx, secctx_sz, 0); + security_release_secctx(&scaff); + } err_get_secctx_failed: kfree(tcomplete); binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c index fcf7dfdecf96..df2b3bf46364 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -1374,12 +1374,16 @@ int ceph_security_init_secctx(struct dentry *dentry, umode_t mode, void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx) { +#ifdef CONFIG_CEPH_FS_SECURITY_LABEL + struct lsmcontext scaff; /* scaffolding */ +#endif #ifdef CONFIG_CEPH_FS_POSIX_ACL posix_acl_release(as_ctx->acl); posix_acl_release(as_ctx->default_acl); #endif #ifdef CONFIG_CEPH_FS_SECURITY_LABEL - security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen); + lsmcontext_init(&scaff, as_ctx->sec_ctx, as_ctx->sec_ctxlen, 0); + security_release_secctx(&scaff); #endif if (as_ctx->pagelist) ceph_pagelist_release(as_ctx->pagelist); diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index ee3bc79f6ca3..194bb09663e0 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -137,8 +137,12 @@ nfs4_label_init_security(struct inode *dir, struct dentry *dentry, static inline void nfs4_label_release_security(struct nfs4_label *label) { - if (label) - security_release_secctx(label->label, label->len); + struct lsmcontext scaff; /* scaffolding */ + + if (label) { + lsmcontext_init(&scaff, label->label, label->len, 0); + security_release_secctx(&scaff); + } } static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) { diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index b2a1d969a172..89d50a7785d8 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -2844,6 +2844,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, int err; struct nfs4_acl *acl = NULL; #ifdef CONFIG_NFSD_V4_SECURITY_LABEL + struct lsmcontext scaff; /* scaffolding */ void *context = NULL; int contextlen; #endif @@ -3345,8 +3346,10 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, out: #ifdef CONFIG_NFSD_V4_SECURITY_LABEL - if (context) - security_release_secctx(context, contextlen); + if (context) { + lsmcontext_init(&scaff, context, contextlen, 0); /*scaffolding*/ + security_release_secctx(&scaff); + } #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ kfree(acl); if (tempfh) { diff --git a/include/linux/security.h b/include/linux/security.h index 1b82590a6a59..0760cf52dbfd 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -135,6 +135,37 @@ enum lockdown_reason { extern const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1]; +/* + * A "security context" is the text representation of + * the information used by LSMs. + * This structure contains the string, its length, and which LSM + * it is useful for. + */ +struct lsmcontext { + char *context; /* Provided by the module */ + u32 len; + int slot; /* Identifies the module */ +}; + +/** + * lsmcontext_init - initialize an lsmcontext structure. + * @cp: Pointer to the context to initialize + * @context: Initial context, or NULL + * @size: Size of context, or 0 + * @slot: Which LSM provided the context + * + * Fill in the lsmcontext from the provided information. + * This is a scaffolding function that will be removed when + * lsmcontext integration is complete. + */ +static inline void lsmcontext_init(struct lsmcontext *cp, char *context, + u32 size, int slot) +{ + cp->slot = slot; + cp->context = context; + cp->len = size; +} + /* * Data exported by the security modules * @@ -570,7 +601,7 @@ int security_ismaclabel(const char *name); int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen); int security_secctx_to_secid(const char *secdata, u32 seclen, struct lsmblob *blob); -void security_release_secctx(char *secdata, u32 seclen); +void security_release_secctx(struct lsmcontext *cp); void security_inode_invalidate_secctx(struct inode *inode); int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen); int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen); @@ -1440,7 +1471,7 @@ static inline int security_secctx_to_secid(const char *secdata, return -EOPNOTSUPP; } -static inline void security_release_secctx(char *secdata, u32 seclen) +static inline void security_release_secctx(struct lsmcontext *cp) { } diff --git a/include/net/scm.h b/include/net/scm.h index 23a35ff1b3f2..f273c4d777ec 100644 --- a/include/net/scm.h +++ b/include/net/scm.h @@ -92,6 +92,7 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg, #ifdef CONFIG_SECURITY_NETWORK static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) { + struct lsmcontext context; struct lsmblob lb; char *secdata; u32 seclen; @@ -106,7 +107,9 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc if (!err) { put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); - security_release_secctx(secdata, seclen); + /*scaffolding*/ + lsmcontext_init(&context, secdata, seclen, 0); + security_release_secctx(&context); } } } diff --git a/kernel/audit.c b/kernel/audit.c index 8ec64e6e8bc0..c17ec23158c4 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1192,6 +1192,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) struct audit_sig_info *sig_data; char *ctx = NULL; u32 len; + struct lsmcontext scaff; /* scaffolding */ err = audit_netlink_ok(skb, msg_type); if (err) @@ -1449,15 +1450,18 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) } sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); if (!sig_data) { - if (lsmblob_is_set(&audit_sig_lsm)) - security_release_secctx(ctx, len); + if (lsmblob_is_set(&audit_sig_lsm)) { + lsmcontext_init(&scaff, ctx, len, 0); + security_release_secctx(&scaff); + } 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); - security_release_secctx(ctx, len); + lsmcontext_init(&scaff, ctx, len, 0); + security_release_secctx(&scaff); } audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0, sig_data, sizeof(*sig_data) + len); @@ -2132,6 +2136,7 @@ int audit_log_task_context(struct audit_buffer *ab) unsigned len; int error; struct lsmblob blob; + struct lsmcontext scaff; /* scaffolding */ security_task_getsecid_subj(current, &blob); if (!lsmblob_is_set(&blob)) @@ -2145,7 +2150,8 @@ int audit_log_task_context(struct audit_buffer *ab) } audit_log_format(ab, " subj=%s", ctx); - security_release_secctx(ctx, len); + lsmcontext_init(&scaff, ctx, len, 0); + security_release_secctx(&scaff); return 0; error_path: diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 7d256fb2ec03..efd1a2a4216e 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1112,6 +1112,7 @@ 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; int rc = 0; @@ -1129,7 +1130,8 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid, rc = 1; } else { audit_log_format(ab, " obj=%s", ctx); - security_release_secctx(ctx, len); + lsmcontext_init(&lsmcxt, ctx, len, 0); /*scaffolding*/ + security_release_secctx(&lsmcxt); } } audit_log_format(ab, " ocomm="); @@ -1342,6 +1344,7 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) static void show_special(struct audit_context *context, int *call_panic) { + struct lsmcontext lsmcxt; struct audit_buffer *ab; int i; @@ -1376,7 +1379,8 @@ static void show_special(struct audit_context *context, int *call_panic) *call_panic = 1; } else { audit_log_format(ab, " obj=%s", ctx); - security_release_secctx(ctx, len); + lsmcontext_init(&lsmcxt, ctx, len, 0); + security_release_secctx(&lsmcxt); } } if (context->ipc.has_perm) { @@ -1533,6 +1537,7 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n, char *ctx = NULL; u32 len; struct lsmblob blob; + struct lsmcontext lsmcxt; lsmblob_init(&blob, n->osid); if (security_secid_to_secctx(&blob, &ctx, &len)) { @@ -1541,7 +1546,8 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n, *call_panic = 2; } else { audit_log_format(ab, " obj=%s", ctx); - security_release_secctx(ctx, len); + lsmcontext_init(&lsmcxt, ctx, len, 0); /* scaffolding */ + security_release_secctx(&lsmcxt); } } diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index be7073df19a5..dbba700fb151 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -130,6 +130,7 @@ static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) { + struct lsmcontext context; struct lsmblob lb; char *secdata; u32 seclen, secid; @@ -145,7 +146,8 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) return; put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); - security_release_secctx(secdata, seclen); + lsmcontext_init(&context, secdata, seclen, 0); /* scaffolding */ + security_release_secctx(&context); } static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index daf554915e07..de223234963d 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -342,6 +342,7 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) int len, ret; char *secctx; struct lsmblob blob; + struct lsmcontext context; /* lsmblob_init() puts ct->secmark into all of the secids in blob. * security_secid_to_secctx() will know which security module @@ -362,7 +363,8 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) ret = 0; nla_put_failure: - security_release_secctx(secctx, len); + lsmcontext_init(&context, secctx, len, 0); /* scaffolding */ + security_release_secctx(&context); return ret; } #else diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c index 79c280d1efce..3fcf44342b14 100644 --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -179,6 +179,7 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) u32 len; char *secctx; struct lsmblob blob; + struct lsmcontext context; lsmblob_init(&blob, ct->secmark); ret = security_secid_to_secctx(&blob, &secctx, &len); @@ -187,7 +188,8 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) seq_printf(s, "secctx=%s ", secctx); - security_release_secctx(secctx, len); + lsmcontext_init(&context, secctx, len, 0); /* scaffolding */ + security_release_secctx(&context); } #else static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index 62c0c5b847c6..5961a9b17f66 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -397,6 +397,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, enum ip_conntrack_info ctinfo; struct nfnl_ct_hook *nfnl_ct; bool csum_verify; + struct lsmcontext scaff; /* scaffolding */ char *secdata = NULL; u32 seclen = 0; @@ -626,8 +627,10 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, } nlh->nlmsg_len = skb->len; - if (seclen) - security_release_secctx(secdata, seclen); + if (seclen) { + lsmcontext_init(&scaff, secdata, seclen, 0); + security_release_secctx(&scaff); + } return skb; nla_put_failure: @@ -635,8 +638,10 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, kfree_skb(skb); net_err_ratelimited("nf_queue: error creating packet message\n"); nlmsg_failure: - if (seclen) - security_release_secctx(secdata, seclen); + if (seclen) { + lsmcontext_init(&scaff, secdata, seclen, 0); + security_release_secctx(&scaff); + } return NULL; } diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c index 15b53fc4e83f..7cb6f27c8cb2 100644 --- a/net/netlabel/netlabel_unlabeled.c +++ b/net/netlabel/netlabel_unlabeled.c @@ -374,6 +374,7 @@ int netlbl_unlhsh_add(struct net *net, struct net_device *dev; struct netlbl_unlhsh_iface *iface; struct audit_buffer *audit_buf = NULL; + struct lsmcontext context; char *secctx = NULL; u32 secctx_len; struct lsmblob blob; @@ -447,7 +448,9 @@ int netlbl_unlhsh_add(struct net *net, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " sec_obj=%s", secctx); - security_release_secctx(secctx, secctx_len); + /* scaffolding */ + lsmcontext_init(&context, secctx, secctx_len, 0); + security_release_secctx(&context); } audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); audit_log_end(audit_buf); @@ -478,6 +481,7 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, struct netlbl_unlhsh_addr4 *entry; struct audit_buffer *audit_buf; struct net_device *dev; + struct lsmcontext context; char *secctx; u32 secctx_len; struct lsmblob blob; @@ -508,7 +512,9 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " sec_obj=%s", secctx); - security_release_secctx(secctx, secctx_len); + /* scaffolding */ + lsmcontext_init(&context, secctx, secctx_len, 0); + security_release_secctx(&context); } audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); audit_log_end(audit_buf); @@ -545,6 +551,7 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, struct netlbl_unlhsh_addr6 *entry; struct audit_buffer *audit_buf; struct net_device *dev; + struct lsmcontext context; char *secctx; u32 secctx_len; struct lsmblob blob; @@ -574,7 +581,8 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " sec_obj=%s", secctx); - security_release_secctx(secctx, secctx_len); + lsmcontext_init(&context, secctx, secctx_len, 0); + security_release_secctx(&context); } audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); audit_log_end(audit_buf); @@ -1093,6 +1101,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, int ret_val = -ENOMEM; struct netlbl_unlhsh_walk_arg *cb_arg = arg; struct net_device *dev; + struct lsmcontext context; void *data; u32 secid; char *secctx; @@ -1163,7 +1172,9 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, NLBL_UNLABEL_A_SECCTX, secctx_len, secctx); - security_release_secctx(secctx, secctx_len); + /* scaffolding */ + lsmcontext_init(&context, secctx, secctx_len, 0); + 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 893301ae0131..ef139d8ae7cd 100644 --- a/net/netlabel/netlabel_user.c +++ b/net/netlabel/netlabel_user.c @@ -84,6 +84,7 @@ struct audit_buffer *netlbl_audit_start_common(int type, struct netlbl_audit *audit_info) { struct audit_buffer *audit_buf; + struct lsmcontext context; char *secctx; u32 secctx_len; struct lsmblob blob; @@ -103,7 +104,8 @@ struct audit_buffer *netlbl_audit_start_common(int type, if (audit_info->secid != 0 && security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " subj=%s", secctx); - security_release_secctx(secctx, secctx_len); + lsmcontext_init(&context, secctx, secctx_len, 0);/*scaffolding*/ + security_release_secctx(&context); } return audit_buf; diff --git a/security/security.c b/security/security.c index cfd75659e7e6..5e6d088d94fb 100644 --- a/security/security.c +++ b/security/security.c @@ -2363,16 +2363,17 @@ int security_secctx_to_secid(const char *secdata, u32 seclen, } EXPORT_SYMBOL(security_secctx_to_secid); -void security_release_secctx(char *secdata, u32 seclen) +void security_release_secctx(struct lsmcontext *cp) { struct security_hook_list *hp; - int ilsm = lsm_task_ilsm(current); hlist_for_each_entry(hp, &security_hook_heads.release_secctx, list) - if (ilsm == LSMBLOB_INVALID || ilsm == hp->lsmid->slot) { - hp->hook.release_secctx(secdata, seclen); - return; + if (cp->slot == hp->lsmid->slot) { + hp->hook.release_secctx(cp->context, cp->len); + break; } + + memset(cp, 0, sizeof(*cp)); } EXPORT_SYMBOL(security_release_secctx);