[08/27] LSM: Use lsmblob in security_secid_to_secctx

Message ID	20190726233923.2570-9-casey@schaufler-ca.com (mailing list archive)
State	Superseded
Headers	show Return-Path: <selinux-owner@kernel.org> From: Casey Schaufler <casey@schaufler-ca.com> To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov Subject: [PATCH 08/27] LSM: Use lsmblob in security_secid_to_secctx Date: Fri, 26 Jul 2019 16:39:04 -0700 Message-Id: <20190726233923.2570-9-casey@schaufler-ca.com> In-Reply-To: <20190726233923.2570-1-casey@schaufler-ca.com> References: <20190726233923.2570-1-casey@schaufler-ca.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: selinux-owner@vger.kernel.org Precedence: bulk
Series	LSM: Module stacking for AppArmor \| expand [v5,00/27] LSM: Module stacking for AppArmor [01/27] LSM: Infrastructure management of the sock security [02/27] LSM: Infrastructure management of the key blob [03/27] LSM: Create and manage the lsmblob data structure. [04/27] LSM: Use lsmblob in security_audit_rule_match [05/27] LSM: Use lsmblob in security_kernel_act_as [06/27] net: Prepare UDS for security module stacking [07/27] LSM: Use lsmblob in security_secctx_to_secid [08/27] LSM: Use lsmblob in security_secid_to_secctx [09/27] LSM: Use lsmblob in security_ipc_getsecid [10/27] LSM: Use lsmblob in security_task_getsecid [11/27] LSM: Use lsmblob in security_inode_getsecid [12/27] LSM: Use lsmblob in security_cred_getsecid [13/27] IMA: Change internal interfaces to use lsmblobs [14/27] LSM: Specify which LSM to display [15/27] LSM: Ensure the correct LSM context releaser [16/27] LSM: Use lsmcontext in security_secid_to_secctx [17/27] LSM: Use lsmcontext in security_dentry_init_security [18/27] LSM: Use lsmcontext in security_inode_getsecctx [19/27] LSM: security_secid_to_secctx in netlink netfilter [20/27] NET: Store LSM netlabel data in a lsmblob [21/27] SELinux: Verify LSM display sanity in binder [22/27] Audit: Add subj_LSM fields when necessary [23/27] Audit: Include object data for all security modules [24/27] LSM: Provide an user space interface for the default display [25/27] NET: Add SO_PEERCONTEXT for multiple LSMs [26/27] LSM: Add /proc attr entry for full LSM context [27/27] AppArmor: Remove the exclusive flag

diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 8685882da64c..1962f6b8abd0 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3120,9 +3120,11 @@ static void binder_transaction(struct binder_proc *proc, if (target_node && target_node->txn_security_ctx) { u32 secid; + struct lsmblob blob; security_task_getsecid(proc->tsk, &secid); - ret = security_secid_to_secctx(secid, &secctx, &secctx_sz); + lsmblob_init(&blob, secid); + ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz); if (ret) { return_error = BR_FAILED_REPLY; return_error_param = ret; diff --git a/include/linux/security.h b/include/linux/security.h index 30337f1a9056..7b4667cc4930 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -446,7 +446,7 @@ 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(u32 secid, char **secdata, u32 *seclen); +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); @@ -1224,7 +1224,8 @@ static inline int security_ismaclabel(const char *name) return 0; } -static inline int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) +static inline int security_secid_to_secctx(struct lsmblob *blob, + char **secdata, u32 *seclen) { return -EOPNOTSUPP; } diff --git a/include/net/scm.h b/include/net/scm.h index e2e71c4bf9d0..31ae605fcc0a 100644 --- a/include/net/scm.h +++ b/include/net/scm.h @@ -97,9 +97,8 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc int err; if (test_bit(SOCK_PASSSEC, &sock->flags)) { - /* Scaffolding - it has to be element 0 for now */ - err = security_secid_to_secctx(scm->lsmblob.secid[0], - &secdata, &seclen); + err = security_secid_to_secctx(&scm->lsmblob, &secdata, + &seclen); if (!err) { put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); diff --git a/kernel/audit.c b/kernel/audit.c index c89ea48c70a6..d0338411d75d 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1430,7 +1430,10 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) case AUDIT_SIGNAL_INFO: len = 0; if (audit_sig_sid) { - err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); + struct lsmblob blob; + + lsmblob_init(&blob, audit_sig_sid); + err = security_secid_to_secctx(&blob, &ctx, &len); if (err) return err; } @@ -2073,12 +2076,14 @@ int audit_log_task_context(struct audit_buffer *ab) unsigned len; int error; u32 sid; + struct lsmblob blob; security_task_getsecid(current, &sid); if (!sid) return 0; - error = security_secid_to_secctx(sid, &ctx, &len); + lsmblob_init(&blob, sid); + error = security_secid_to_secctx(&blob, &ctx, &len); if (error) { if (error != -EINVAL) goto error_path; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 18ee5556c086..d31914088a82 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -947,6 +947,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid, char *ctx = NULL; u32 len; int rc = 0; + struct lsmblob blob; ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); if (!ab) @@ -956,7 +957,8 @@ 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 (sid) { - if (security_secid_to_secctx(sid, &ctx, &len)) { + lsmblob_init(&blob, sid); + if (security_secid_to_secctx(&blob, &ctx, &len)) { audit_log_format(ab, " obj=(none)"); rc = 1; } else { @@ -1198,7 +1200,10 @@ static void show_special(struct audit_context *context, int *call_panic) if (osid) { char *ctx = NULL; u32 len; - if (security_secid_to_secctx(osid, &ctx, &len)) { + struct lsmblob blob; + + lsmblob_init(&blob, osid); + if (security_secid_to_secctx(&blob, &ctx, &len)) { audit_log_format(ab, " osid=%u", osid); *call_panic = 1; } else { @@ -1349,9 +1354,10 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n, if (n->osid != 0) { char *ctx = NULL; u32 len; + struct lsmblob blob; - if (security_secid_to_secctx( - n->osid, &ctx, &len)) { + lsmblob_init(&blob, n->osid); + if (security_secid_to_secctx(&blob, &ctx, &len)) { audit_log_format(ab, " osid=%u", n->osid); if (call_panic) *call_panic = 2; diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 2a5c868ce135..e05f4ef68bd8 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -139,8 +139,7 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) if (err) return; - /* Scaffolding - it has to be element 0 */ - err = security_secid_to_secctx(lb.secid[0], &secdata, &seclen); + err = security_secid_to_secctx(&lb, &secdata, &seclen); if (err) return; diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index 66c596d287a5..ca0968f13240 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -330,8 +330,10 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) struct nlattr *nest_secctx; int len, ret; char *secctx; + struct lsmblob blob; - ret = security_secid_to_secctx(ct->secmark, &secctx, &len); + lsmblob_init(&blob, ct->secmark); + ret = security_secid_to_secctx(&blob, &secctx, &len); if (ret) return 0; @@ -615,8 +617,10 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct) { #ifdef CONFIG_NF_CONNTRACK_SECMARK int len, ret; + struct lsmblob blob; - ret = security_secid_to_secctx(ct->secmark, NULL, &len); + lsmblob_init(&blob, ct->secmark); + ret = security_secid_to_secctx(&blob, NULL, &len); if (ret) return 0; diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c index c2ae14c720b4..c793103f3cd7 100644 --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -175,8 +175,10 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) int ret; u32 len; char *secctx; + struct lsmblob blob; - ret = security_secid_to_secctx(ct->secmark, &secctx, &len); + lsmblob_init(&blob, ct->secmark); + ret = security_secid_to_secctx(&blob, &secctx, &len); if (ret) return; diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index 0dcc3592d053..59211bff90ab 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -309,13 +309,17 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) { u32 seclen = 0; #if IS_ENABLED(CONFIG_NETWORK_SECMARK) + struct lsmblob blob; + if (!skb || !sk_fullsock(skb->sk)) return 0; read_lock_bh(&skb->sk->sk_callback_lock); - if (skb->secmark) - security_secid_to_secctx(skb->secmark, secdata, &seclen); + if (skb->secmark) { + lsmblob_init(&blob, skb->secmark); + security_secid_to_secctx(&blob, secdata, &seclen); + } read_unlock_bh(&skb->sk->sk_callback_lock); #endif diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c index 2976370e41aa..2d8dd5b84457 100644 --- a/net/netlabel/netlabel_unlabeled.c +++ b/net/netlabel/netlabel_unlabeled.c @@ -389,6 +389,7 @@ int netlbl_unlhsh_add(struct net *net, struct audit_buffer *audit_buf = NULL; char *secctx = NULL; u32 secctx_len; + struct lsmblob blob; if (addr_len != sizeof(struct in_addr) && addr_len != sizeof(struct in6_addr)) @@ -451,7 +452,8 @@ int netlbl_unlhsh_add(struct net *net, unlhsh_add_return: rcu_read_unlock(); if (audit_buf != NULL) { - if (security_secid_to_secctx(secid, + lsmblob_init(&blob, secid); + if (security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " sec_obj=%s", secctx); @@ -488,6 +490,7 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, struct net_device *dev; char *secctx; u32 secctx_len; + struct lsmblob blob; spin_lock(&netlbl_unlhsh_lock); list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, @@ -507,8 +510,10 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, addr->s_addr, mask->s_addr); if (dev != NULL) dev_put(dev); + if (entry != NULL) + lsmblob_init(&blob, entry->secid); if (entry != NULL && - security_secid_to_secctx(entry->secid, + security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " sec_obj=%s", secctx); security_release_secctx(secctx, secctx_len); @@ -550,6 +555,7 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, struct net_device *dev; char *secctx; u32 secctx_len; + struct lsmblob blob; spin_lock(&netlbl_unlhsh_lock); list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); @@ -568,8 +574,10 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, addr, mask); if (dev != NULL) dev_put(dev); + if (entry != NULL) + lsmblob_init(&blob, entry->secid); if (entry != NULL && - security_secid_to_secctx(entry->secid, + security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " sec_obj=%s", secctx); security_release_secctx(secctx, secctx_len); @@ -1090,6 +1098,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, u32 secid; char *secctx; u32 secctx_len; + struct lsmblob blob; data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid, cb_arg->seq, &netlbl_unlabel_gnl_family, @@ -1144,7 +1153,8 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, secid = addr6->secid; } - ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); + lsmblob_init(&blob, secid); + ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len); if (ret_val != 0) goto list_cb_failure; ret_val = nla_put(cb_arg->skb, diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c index 4676f5bb16ae..2ccc6567e2a2 100644 --- a/net/netlabel/netlabel_user.c +++ b/net/netlabel/netlabel_user.c @@ -100,6 +100,7 @@ struct audit_buffer *netlbl_audit_start_common(int type, struct audit_buffer *audit_buf; char *secctx; u32 secctx_len; + struct lsmblob blob; if (audit_enabled == AUDIT_OFF) return NULL; @@ -112,10 +113,9 @@ struct audit_buffer *netlbl_audit_start_common(int type, from_kuid(&init_user_ns, audit_info->loginuid), audit_info->sessionid); + lsmblob_init(&blob, audit_info->secid); if (audit_info->secid != 0 && - security_secid_to_secctx(audit_info->secid, - &secctx, - &secctx_len) == 0) { + security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " subj=%s", secctx); security_release_secctx(secctx, secctx_len); } diff --git a/security/security.c b/security/security.c index e231fbfd68f2..837c3c6b6e7c 100644 --- a/security/security.c +++ b/security/security.c @@ -1975,10 +1975,20 @@ int security_ismaclabel(const char *name) } EXPORT_SYMBOL(security_ismaclabel); -int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) +int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen) { - return call_int_hook(secid_to_secctx, -EOPNOTSUPP, secid, secdata, - seclen); + struct security_hook_list *hp; + int rc; + + 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; + rc = hp->hook.secid_to_secctx(blob->secid[hp->lsmid->slot], + secdata, seclen); + if (rc != 0) + return rc; + } + return 0; } EXPORT_SYMBOL(security_secid_to_secctx);

[08/27] LSM: Use lsmblob in security_secid_to_secctx

Commit Message

Patch