@@ -2711,6 +2711,7 @@ static void binder_transaction(struct binder_proc *proc,
if (target_node && target_node->txn_security_ctx) {
u32 secid;
+ struct lsmblob blob;
size_t added_size;
/*
@@ -2723,7 +2724,16 @@ static void binder_transaction(struct binder_proc *proc,
* case well anyway.
*/
security_task_getsecid_obj(proc->tsk, &secid);
- ret = security_secid_to_secctx(secid, &secctx, &secctx_sz);
+ /*
+ * Later in this patch set security_task_getsecid() will
+ * provide a lsmblob instead of a secid. lsmblob_init
+ * is used to ensure that all the secids in the lsmblob
+ * get the value returned from security_task_getsecid(),
+ * which means that the one expected by
+ * security_secid_to_secctx() will be set.
+ */
+ lsmblob_init(&blob, secid);
+ ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz);
if (ret) {
return_error = BR_FAILED_REPLY;
return_error_param = ret;
@@ -547,7 +547,7 @@ 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);
@@ -1397,7 +1397,8 @@ 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;
}
@@ -92,12 +92,17 @@ 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 lsmblob lb;
char *secdata;
u32 seclen;
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
+ /* There can only be one security module using the secid,
+ * and the infrastructure will know which it is.
+ */
+ lsmblob_init(&lb, scm->secid);
+ err = security_secid_to_secctx(&lb, &secdata, &seclen);
if (!err) {
put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
@@ -1442,7 +1442,16 @@ 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 sets all values in the lsmblob
+ * to audit_sig_sid. This is temporary until
+ * audit_sig_sid is converted to a lsmblob, which
+ * happens later in this patch set.
+ */
+ lsmblob_init(&blob, audit_sig_sid);
+ err = security_secid_to_secctx(&blob, &ctx, &len);
if (err)
return err;
}
@@ -2131,12 +2140,19 @@ int audit_log_task_context(struct audit_buffer *ab)
unsigned len;
int error;
u32 sid;
+ struct lsmblob blob;
security_task_getsecid_subj(current, &sid);
if (!sid)
return 0;
- error = security_secid_to_secctx(sid, &ctx, &len);
+ /*
+ * lsmblob_init sets all values in the lsmblob to sid.
+ * This is temporary until security_task_getsecid is converted
+ * to use a lsmblob, which happens later in this patch set.
+ */
+ lsmblob_init(&blob, sid);
+ error = security_secid_to_secctx(&blob, &ctx, &len);
if (error) {
if (error != -EINVAL)
goto error_path;
@@ -671,6 +671,13 @@ static int audit_filter_rules(struct task_struct *tsk,
security_task_getsecid_subj(tsk, &sid);
need_sid = 0;
}
+ /*
+ * lsmblob_init sets all values in the lsmblob
+ * to sid. This is temporary until
+ * security_task_getsecid() is converted to
+ * provide a lsmblob, which happens later in
+ * this patch set.
+ */
lsmblob_init(&blob, sid);
result = security_audit_rule_match(&blob,
f->type, f->op,
@@ -687,6 +694,13 @@ static int audit_filter_rules(struct task_struct *tsk,
if (f->lsm_isset) {
/* Find files that match */
if (name) {
+ /*
+ * lsmblob_init sets all values in the
+ * lsmblob to sid. This is temporary
+ * until name->osid is converted to a
+ * lsmblob, which happens later in
+ * this patch set.
+ */
lsmblob_init(&blob, name->osid);
result = security_audit_rule_match(
&blob,
@@ -993,6 +1007,7 @@ 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)
@@ -1002,7 +1017,8 @@ 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 {
@@ -1245,7 +1261,10 @@ 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 {
@@ -1398,9 +1417,10 @@ 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;
@@ -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 lsmblob lb;
char *secdata;
u32 seclen, secid;
int err;
@@ -138,7 +139,8 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
if (err)
return;
- err = security_secid_to_secctx(secid, &secdata, &seclen);
+ lsmblob_init(&lb, secid);
+ err = security_secid_to_secctx(&lb, &secdata, &seclen);
if (err)
return;
@@ -338,8 +338,13 @@ 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() 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, &secctx, &len);
if (ret)
return 0;
@@ -647,8 +652,13 @@ 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() 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)
return 0;
@@ -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;
@@ -305,13 +305,20 @@ 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() 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, skb->secmark);
+ security_secid_to_secctx(&blob, secdata, &seclen);
+ }
read_unlock_bh(&skb->sk->sk_callback_lock);
#endif
@@ -376,6 +376,7 @@ 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))
@@ -438,7 +439,11 @@ 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() puts secid 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, secid);
+ if (security_secid_to_secctx(&blob,
&secctx,
&secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
@@ -475,6 +480,7 @@ 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,
@@ -494,8 +500,13 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
addr->s_addr, mask->s_addr);
if (dev != NULL)
dev_put(dev);
+ /* lsmblob_init() puts entry->secid into all of the secids
+ * in blob. security_secid_to_secctx() will know which
+ * security module to use to create the secctx. */
+ 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);
@@ -537,6 +548,7 @@ 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);
@@ -555,8 +567,13 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
addr, mask);
if (dev != NULL)
dev_put(dev);
+ /* lsmblob_init() puts entry->secid into all of the secids
+ * in blob. security_secid_to_secctx() will know which
+ * security module to use to create the secctx. */
+ 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);
@@ -1082,6 +1099,7 @@ 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,
@@ -1136,7 +1154,11 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
secid = addr6->secid;
}
- ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
+ /* lsmblob_init() secid 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, 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,
@@ -86,6 +86,7 @@ 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;
@@ -98,10 +99,9 @@ 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);
}
@@ -2172,17 +2172,16 @@ 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)
{
struct security_hook_list *hp;
int rc;
- /*
- * Currently, only one LSM can implement secid_to_secctx (i.e this
- * LSM hook is not "stackable").
- */
hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
- rc = hp->hook.secid_to_secctx(secid, secdata, seclen);
+ 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 != LSM_RET_DEFAULT(secid_to_secctx))
return rc;
}
Change security_secid_to_secctx() to take a lsmblob as input instead of a u32 secid. It will then call the LSM hooks using the lsmblob element allocated for that module. The callers have been updated as well. This allows for the possibility that more than one module may be called upon to translate a secid to a string, as can occur in the audit code. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Cc: netdev@vger.kernel.org Cc: linux-audit@redhat.com Cc: netfilter-devel@vger.kernel.org To: Pablo Neira Ayuso <pablo@netfilter.org> To: Paul Moore <paul@paul-moore.com> --- drivers/android/binder.c | 12 +++++++++- include/linux/security.h | 5 +++-- include/net/scm.h | 7 +++++- kernel/audit.c | 20 +++++++++++++++-- kernel/auditsc.c | 28 +++++++++++++++++++---- net/ipv4/ip_sockglue.c | 4 +++- net/netfilter/nf_conntrack_netlink.c | 14 ++++++++++-- net/netfilter/nf_conntrack_standalone.c | 4 +++- net/netfilter/nfnetlink_queue.c | 11 +++++++-- net/netlabel/netlabel_unlabeled.c | 30 +++++++++++++++++++++---- net/netlabel/netlabel_user.c | 6 ++--- security/security.c | 11 +++++---- 12 files changed, 123 insertions(+), 29 deletions(-)