From patchwork Mon Apr 18 14:59:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 12816765 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 DB184C433EF for ; Mon, 18 Apr 2022 15:40:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239562AbiDRPnO (ORCPT ); Mon, 18 Apr 2022 11:43:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345609AbiDRPmv (ORCPT ); Mon, 18 Apr 2022 11:42:51 -0400 Received: from sonic305-27.consmr.mail.ne1.yahoo.com (sonic305-27.consmr.mail.ne1.yahoo.com [66.163.185.153]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1D62A338BA for ; Mon, 18 Apr 2022 08:08:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1650294480; bh=wXGkXPOoZqXR1+vDMzUyhmy3q+IXdFsHGXXFWyw6XmU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=EwuhT9EzGIImq4liZX9W/+3fYM6DvJBCNlmQ82hgVBPr3pXmVlpAxBIHvrdyLYXV8vpLCs2AwBOfic9nbyTHqHlkL8zHfJ6utQQsArTH7Oyy7Mw9DC+TZLtDvUKUa717s3JGHsnXzQOsusRfh2As1pbLoCmEiUzzTtmLedSSiFNkqoHhz5YuuMXX9MwnpPQ2GNk+Togl68hkoOq/QhOx8XUIuKcX0j41wNa4XzEBhsxI1EKtEs3WqFrpqNGyTf+2ZFgLcKeEkzwuSNVL6Ms9CLJSDBKxjD7mUNJ8yQqLJeMgVVXkAlMHObNzvRWDfFhYbLWCzQEB+cOCH1VkoiH1BQ== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1650294480; bh=gAVTj3N4cC5riWjoqNrDl89ddH6UyK+syOskTWBRoSb=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=j09sM08yzq6fsvd6VJlQXqjSnf2k9iuEQr6niq6bk1fZ87lkiCJOTMo1CaHZvc/x73hvXZcOl/74MsE9G5Ipn4AKdpNZcYTCTTvwjW/DLmjE0yh7drdgn5PDhbokRF4sp85hwgufODWrFjuLEapVaY8PbIzHhTFkDnrNkcpVPe0wc6le5EnqeYyqgVNCta8qWrIFd3XnvKvdZbRlL65L4aEgT5Od2O+/StUUB7bu9NzVdWbruUFczLru3CCwlGjHm0y75rTd18F8N7Mjr9e9a4UkHZd6te3jhO6F5LkwhOVxCpMK3oTfqLdQUK9RJxhupD4eQSk8GA+wVpuEFnXCgA== X-YMail-OSG: 2K9cdUkVM1l9wPqyn6v5DBCr8ZY..tCsjBaYT37tJBPw6_1KcCRrqMqh1UZzDkR LHLKO5WMRkVJ0x_EowWnC.9L72brloOakb2tUmMHeghnAZOCozp2JsIYI.cnGgNtBfrAxtIf7Zm7 qkTgHChNwpmfcuqbKYhxCA8GVZA5mi1Of2mqF3CvrP4Gb1ODpKKDvT0YCil5yAB6Pqxoud2QM9sx 54ZX9ccDGaheedrvHU4ReCqD95NmeEZPB5giZfacnVBbMsppCGZwIsuN_Yak_jtnRnBAffWbYCQO GLJw0cX7.x2BZUPivclKeeNji3OSJBFtOWkR1cUVMYyWlDewQ0deLZTRDKg8ATj98n7aDeuYDW_x w_lDNQKrM26TeGzhJdmTTl0BIVuveXopNXffpijZMwamzwHHV_ymEXm3mn4.4havK5gkHhHgN5t2 6f90wETBNP6vVlU32FSdkdg.ltrLo.ufs.UYoknXrkS8iNaDwm51orQvSdoPHfkDFpYTuB.ODwDz beVHBjhiVShC.9Z2mLsol0N2EE81Qtg1y26j.JHKwtOBV863vpNtiRstiFYtJ0eknpiAtsuojLX4 7W8VXy0z3tNp9XH7xc62B1BluBlFq20HGw7g5AH2fjd3X6KPLoQL2IhSHxDGiazDOkmNC7K8tQI4 eg0MOUCb.HQuyXwCDbsUfoLEyKpUnt9bEQPJVJdlzNWBErjPRtEIDP5eiAFdY3gunQ84zGes0WcI FHHISkwAkQkcMak4mSBfD.1E8jasAqnPNpoEvD8W4wBUh_pSvpr.7c4SZ3u5e0Kjb.34FVz5679r ztPgi9u6kJXkyr9xqVzWaw_VLbBKsX_lOWTxhazsCZb6h.Syw2OOcIEvCY.bLucc6AJCfl8vFHYH 9N7RhWEGeCXGoW9Natb.e_3JvZcs1i3xEavuJX7RhEBPusGapsoDwysi4qvQ4WAzvbOBdswdF9b_ HRWaTEq5gzru4okTvHpp1l9barXQ3ib7kF2tLoS0jA6HUPuygX647BL.8jyMa0HN1OPDSWxgOOQv hgHczEGoO8P96tgqjJR9.rQJr83pOBxXt_CcT8zubBnJDbBD.0FWAU4J6Fe9Ivtz6hUdVeBRCq5n zXj0.t0IzGm8hZd4ezvaRkfCgwxSIkXEFx4FN36HVmV7ZKi3UU4Pmhs32HMiSz4M5Km7NMhAFSQO IL1qpGFGwnSukwIONACVTH3xiqfAK449ThOFn7ZyIYNa4gbKvqvbqhOT_t6OphESrgSCTKiiOVVo lFaVl494rZvYNSmzgfNWbuOqjpImXIvLwZqVbUOjzlvxOjuTYORJj32ujbdBTf8ndk7zKBWCZ5jW 144QssT4GFX1ednChTOzsCOFQ94uwbHEuD1Jz0STJyvEIAJh6AwHVheVVjCh7fP_iQZFEyhJu9Dk ZDnStehGtuRrMaQpJ95hc5sQ.cDCR2Prmj7iNUIEL5WCsEZLL3vRTAkJQQXQ3LcZiJUgLupQZCjX rMgin7IefWNxduuI7GsedJ3ie3fw6OMisQ6Qci8X5owl192I.rh7Uwhud7URyZZ7_O_3g4nTG_hV IhK90Rx1JV.2jTF_r6.ROzomwgTnBgAqSJ0WjoqhhJhJbxEeTvzyt9.DhwVeKfQRwj5mBZyY8tpf _mTtlqjDqQiB4VTaSX2djhWud66mqZqh_5Pn.SUxUEsBa9fQKq3nylTVkEBdiowERwapHtk05Ydp ThzzI_buccG2kPTOOh4FpI_dB57UqJ..4N5wHvhKe8KTVZivkLq6jO731QPBwYvQPQ.2YNw5YPTr rpX7VaWWMOkqMXhro5cz1wslTv3FiE1CE8r5xUKmBU9NjDEgDXsWigmnwNjnCskt0WMSlzLV1Ibb Z.sWoqvQOQNEiz8IPEpejITgiNqFF5qMJdzNww6Z9415or0sI.xPmb6dxelcn46EuqcD23WhG542 XrwEGhtdreGCHZENoH4jB6EHCyf2zQhPaJfJQXwBoFirUw4hJWM98Ovvx1oH8hwRk.9YFSZIxI.4 WnuUyFBVHwlLBNoAUv8aBxNGj3oXNM7dfWkOQ7VPioCJ2yOjxipTpNFFCqyl6n6deXRhuQrmCcQ3 JTaXS5elbMDVoNGF_c6CkunCr2_wZx46kU6aYrI9EAvA0tnlxsoSIYLMoBn90swnNfT4xTRs71RE fKFO7HTw4LbQ4iJrjeUmE0eP_BG_LzMthrMPEB7o2Gdvo9oIcUr9n833R7gfqz1ywp6U41lOjtrX wYJL7Bn4WibefV_JL5OKahuzMVtTi44nu2m4qL1z1TFSAYdf7uggUjDDEJ6Z4WtfSvsgMpaeQiUv eJLtQVaZGlolv5Lfx9W7N98IlINyi X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic305.consmr.mail.ne1.yahoo.com with HTTP; Mon, 18 Apr 2022 15:08:00 +0000 Received: by hermes--canary-production-ne1-c7c4f6977-qcc8c (VZM Hermes SMTP Server) with ESMTPA ID 2afd461de5a55bc64b17c8606f02f3b8; Mon, 18 Apr 2022 15:07:57 +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 v35 15/29] LSM: Ensure the correct LSM context releaser Date: Mon, 18 Apr 2022 07:59:31 -0700 Message-Id: <20220418145945.38797-16-casey@schaufler-ca.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220418145945.38797-1-casey@schaufler-ca.com> References: <20220418145945.38797-1-casey@schaufler-ca.com> MIME-Version: 1.0 Precedence: bulk List-ID: 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 26838061defb..2125b4b795da 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2725,6 +2725,7 @@ 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 *) @@ -3033,7 +3034,8 @@ 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; @@ -3433,8 +3435,10 @@ 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 afec84088471..8ac30a5c05ef 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -1383,12 +1383,16 @@ 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 16106f805ffa..dc8bdcdd2d2a 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 da92e7d2ab6a..77388b5ece56 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 a6574d13c6fb..5a681f60fd50 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 * @@ -587,7 +618,7 @@ 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); @@ -1451,7 +1482,7 @@ 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 2b670ac129be..0eff57959b4e 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 52ea8da8462f..1503fb281278 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 a28e275981d4..f053d7544355 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 bba3a66f5636..3b6ba86783f6 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 ec4d1b3026d8..407852be43da 100644 --- a/security/security.c +++ b/security/security.c @@ -2379,16 +2379,17 @@ 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);