From patchwork Tue Jun 28 00:55:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 12897429 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 D79E3CCA47F for ; Tue, 28 Jun 2022 01:07:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242837AbiF1BHU (ORCPT ); Mon, 27 Jun 2022 21:07:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35092 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242442AbiF1BHS (ORCPT ); Mon, 27 Jun 2022 21:07:18 -0400 Received: from sonic304-28.consmr.mail.ne1.yahoo.com (sonic304-28.consmr.mail.ne1.yahoo.com [66.163.191.154]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0283422B14 for ; Mon, 27 Jun 2022 18:07:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1656378434; bh=aw7sdlRZ8+yTH4ZutWyqDOvJ3351w3XteiZy62cDUVM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=YY3r3riZc5HbOfs1ic71Qou6blZT/88EC6ngwEPCvV9b9cpIUKvxLDXQ3QmD2Wr8pwUzrx8kLEzaVl942vQrjVqfFmwUSh91lR4MAZiBOJLITUDTIEq28dt91ghMiCDRLpuk4pkW8bDrDzTpMYqM5HN/S8ghvQks2pvikPlyYAJlz0TiDg4fscTB/YlbO84VYVdDX07go28lGNLhWGwBp3g4o6kGIhr+pQxIpLGGV1DQjUuReIgXoNgpENMQd5Fl6keA+LuvQ+sgIajg3C0V7PsoUnfBwR6edguomDAMtk1JFNkyfsXljcCmTU2nXXnR6JftzLVlClUCY2sSHbafkA== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1656378434; bh=8a8JxfEKsl4hP/RPXhvPmjxxfyzvrLjdGGuivDs/i8j=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=QzDolqyQvbaT/HFve69pyXUkioiPYQCRGyC0x4LRgAtay2osjmTpsW7TAyRcb9mYkAQAd1CfcmV4GLVKY6f56rngB8mAguVedevjbmW8Nf2otDppW/0RXjWGf8k8yJE2ubz8V2Xk1DEpdS2f1OjIJIvEiTcCuktZHsE/gOvwrnNBCi8Q2pk+0x8eOrUCxVB7SC9WXeN/PTG5gRq2YSs4i3pbF2jHG2WZyfEvECqEefeMP1TBi4mFtVHrF7VnPSF6czNL4O5lvHknandJcANHQWY2ENNQ5a6boDfT4J6l+rbsqcPLXH688zwbjxGYAwuChZ58/LwNdt4PckltadmXUQ== X-YMail-OSG: BbX5a8YVM1kl0nymA5_sb.E2emLuMr8Qnnz2kRiSToGaxeefgOUzTChJXMPlQTa yZPOd.IkJ3u7gJ_hul50fUbt38PtctvZL7cBgaAMDkRlyI81DEN8Px.LXoPfqEFbiorYyLpLUQri YmvKp3loecIEMnn4NEaywv.3bW4m1MXe_Zz19Y.R0oZbYH7CPXWU_dQ6U98TClQD.K8k4uD7NU_M a3pFSRbnYf9RbRzzjde3kZhepxVvbIGIwPsftbc_BA8BXvBhhpk7EYyvCKIdEzDEzkiFounJcdJP wtCksL7hyhK08v2o1.lAkh70162SyN3.S0eO5agnmsDk3HATjT5JNH4FOuDbMlwJrWrAm.4V8eZy uLdWkXWizImwt4FpwYLWiv43zEhbisVqNRkpIRbjj2guzlk1CVDqdTI9WcVHLhcK0Q7XUs8fUuO9 YTMbIGxQqlMrDHcQK6i5vBN4FiVYaNDoVlLkeQIquRa5YdOcUKRPRBLgrRCgBszBG8XgZbU1QbAH oErJS1wiHvxaknYKfJmIK6vPo_YR8B.ZOfblH7Lb3YhJn7lja3cg87DTVen65VVsMpCoWSM8o2.D ck_zkEFBnnTCI0DClKOt.delWEF8owamdYW_VHs7tmQzEDIWq6fFLywugjax9eQ2JxqFDR8g9040 MVanoYx0pjuaEJby94tqucTxp0i1PlHHcHkASVK4AkvGoISHfBWVjXN9ICp2oSwLkaqMwEZXPi5i m7KN0eNbf7fgINAnZax0PxTjoMdl2BDhAHlrWHDJdiKseoi28lgYZIHTvyNKqnL5qe8o6u7Xre7Z AXV6jnAy92s07tPXyTuYmm1nmglLdQg0E2YmQjYeti8ye8fm2fHgclTWiVDKyGvmoO2XaTpihgiA 87QQ42J5hatGyD9wCfwhQImN9BJ3BrR8xIB6UEhjlQRuMu3mjsZXYqRzvngjrIJND._D2jv0dMZF ZT4zMo_TrjrdNhvrKE7vbsJq7enyFfKgPZln2jWT_glfC3znc4RSROL6DRYyB5o65dKW.PbxEcw5 pqlhPu4u2uPk4feS4tR6od1tXc0km92QD98OVfxjAlMGLTD07JFfnwSqbvzFth91.rKHTNdTW9dM dgh6y8weZXojz8Ri3RkZijVgTYP1pwtlB3dkgHTGIyjUj8TW05anEq_ho0fdPAKcCZ2fH8kTPSf8 KbRKq10cSCmo_apxyz5uHYz1LJKj1vna4M2zhlmNNty3BoTdTZ_NFhwBqWd2xsgIRrpEfji_q0Dj 6_EJrWXll74C.5FvF_FevNDkVqGF9nTgDW_6B1Qt9IERoxdzHJOPIucqLOo5i0rXDKTZ6Jrivky7 _MyJAMOYAdzc67jglh.npV.4T94jKJZOD2aE.oHmQSX_VHYYlhuXJpvPLN0cn0LrbNfblTOFTHZS RXXILoStZM8GvxViETAvjHXQMKYLit31zIAaZ7UMlZscEXcunHSAUssXV6JGZP4JY4AVLNktvH2I HtfAAV4yTnkpe_rkZoUHnoxxcLdY.oRP_s7Q3zlzKfYVcmHxfEGfqbtyHcxRXOnyI.2BcVKZ9pMN 3jxvCGzKjN.nbDGSkCEOo9vjD.lI3EmQaRN5mTmb_ttULAR00dGQyOVHC8QsKb5yx41lJxwrkIjF fVtBw2HOKJ99sOEaNnLUwWLWPCkEP3qH6Iaif3Aoy0S_y5dCecJ1eqv7kmynwQFHvnNRPq2NRXfF UjXtqM9pt3SC36beAgV.gZV0TZCV_A9Wz5AcYRqGPl0i6rBcYLKgyx4hd_gbdwHbYNU3gKbxP6fP .mc.YtgJdrwXmwE51XCKaGYAPdJptwds5Qfuc5RTvciMWRujhpvx3FTvoyc1HvjB0yEBGKsrJ58u pxrhvs.FrQtsqnkXxdkqVwmiC9YanaSLkE.SsrT9gsbaStdoVC3SNmoiTqeIU87rnEd1vT8aNvaG dQ6_tZ4bpv5poWo.Vs3GWh_kE2yA9TQzl7hciRBUZYNLU9C7qVK528jg3MS34r1PxDgQ.20X5zZy NnckRrOv9f3e.IloOxFN_qeqPoL6VfDkNfaJr4iTpkM5tTbRZHKWjV58fKPR6QHWSQszZlPGhXTq 9bnX5IWL41MEYzwUjZ1EYyX1uMRlyGZhfuNQLIu32LlhuZHtg6m.w.JzWOwPrkFoIopU_ihPzviD oqRmcIWVhLkiJpihDVUKp84pkyn.SAtC.uicsz1e1avV52Vxsn4f.w.n5O7p1x_ar6ArW5vlZ1.b zzpDiFdTyHuYpCuqzxyErN_9tnYSoqLe6c7jXSqD1v34PagBtPepfNzpNUrIEbzdC7MJh_ekJazq Jv62nkJWb3S6kY4F6eDIhnHfL_x0dw_qdxHZENyMAhIGFiKpYbSsxWObm.O2XAueV X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic304.consmr.mail.ne1.yahoo.com with HTTP; Tue, 28 Jun 2022 01:07:14 +0000 Received: by hermes--production-ne1-7459d5c5c9-fdkvw (Yahoo Inc. Hermes SMTP Server) with ESMTPA ID 2b15a6d5cfb14c238c7aa5ef58eb279b; Tue, 28 Jun 2022 01:07:12 +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, Chuck Lever , linux-integrity@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, linux-nfs@vger.kernel.org Subject: [PATCH v37 15/33] LSM: Ensure the correct LSM context releaser Date: Mon, 27 Jun 2022 17:55:53 -0700 Message-Id: <20220628005611.13106-16-casey@schaufler-ca.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220628005611.13106-1-casey@schaufler-ca.com> References: <20220628005611.13106-1-casey@schaufler-ca.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: selinux@vger.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 c2f71c22a90e..9c1ed7fbda87 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2783,6 +2783,7 @@ 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 */ struct list_head sgc_head; struct list_head pf_head; const void __user *user_buffer = (const void __user *) @@ -3116,7 +3117,8 @@ 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; @@ -3532,8 +3534,10 @@ 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 f141f5246163..4c4dad4713b6 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -1391,12 +1391,16 @@ 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 c0fdcf8c0032..d6bdb0868729 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -133,8 +133,12 @@ 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 61b2aae81abb..512ad208d62a 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -2830,6 +2830,7 @@ 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 @@ -3341,8 +3342,10 @@ 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 a7a445bac8ce..a20fc156c697 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -137,6 +137,37 @@ 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 * @@ -589,7 +620,7 @@ 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); @@ -1453,7 +1484,7 @@ 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 f67f1eb7f4fa..23c8f8cbe8a6 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1214,6 +1214,7 @@ 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) @@ -1471,15 +1472,18 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) } sig_data = kmalloc(struct_size(sig_data, ctx, 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, struct_size(sig_data, ctx, len)); @@ -2171,6 +2175,7 @@ int audit_log_task_context(struct audit_buffer *ab) unsigned len; int error; struct lsmblob blob; + struct lsmcontext scaff; /* scaffolding */ security_current_getsecid_subj(&blob); if (!lsmblob_is_set(&blob)) @@ -2185,7 +2190,8 @@ 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 fa3cfe569ce2..9ed58db58965 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1121,6 +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; int rc = 0; @@ -1138,7 +1139,8 @@ 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="); @@ -1398,6 +1400,7 @@ 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; @@ -1432,7 +1435,8 @@ 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) { @@ -1594,6 +1598,7 @@ 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)) { @@ -1602,7 +1607,8 @@ 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 933a8f94f93a..70ca4510ea35 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 ddc8cd65ed12..da36301e2185 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -348,6 +348,7 @@ 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 @@ -368,7 +369,8 @@ 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 2c1f3280d56e..644dec6a8ef5 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 6269fe122345..f69d5e997da2 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 = 0; const struct nfnl_ct_hook *nfnl_ct; bool csum_verify; + struct lsmcontext scaff; /* scaffolding */ char *secdata = NULL; u32 seclen = 0; ktime_t tstamp; @@ -634,8 +635,10 @@ 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: @@ -643,8 +646,10 @@ 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 bbb3b6a4f0d7..b3e3d920034d 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 d60bc6abaa40..e434f085afab 100644 --- a/security/security.c +++ b/security/security.c @@ -2373,16 +2373,17 @@ 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);