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-rw-r--r--security/selinux/hooks.c129
-rw-r--r--security/selinux/include/classmap.h4
-rw-r--r--security/selinux/ss/conditional.c2
-rw-r--r--security/selinux/ss/policydb.c8
4 files changed, 99 insertions, 44 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 0b4e32161b77..efa6108b1ce9 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2286,7 +2286,7 @@ static int check_nnp_nosuid(const struct linux_binprm *bprm,
return -EACCES;
}
-static int selinux_bprm_set_creds(struct linux_binprm *bprm)
+static int selinux_bprm_creds_for_exec(struct linux_binprm *bprm)
{
const struct task_security_struct *old_tsec;
struct task_security_struct *new_tsec;
@@ -2297,8 +2297,6 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
/* SELinux context only depends on initial program or script and not
* the script interpreter */
- if (bprm->called_set_creds)
- return 0;
old_tsec = selinux_cred(current_cred());
new_tsec = selinux_cred(bprm->cred);
@@ -5842,40 +5840,60 @@ static unsigned int selinux_ipv6_postroute(void *priv,
static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
{
- int err = 0;
- u32 perm;
+ int rc = 0;
+ unsigned int msg_len;
+ unsigned int data_len = skb->len;
+ unsigned char *data = skb->data;
struct nlmsghdr *nlh;
struct sk_security_struct *sksec = sk->sk_security;
+ u16 sclass = sksec->sclass;
+ u32 perm;
- if (skb->len < NLMSG_HDRLEN) {
- err = -EINVAL;
- goto out;
- }
- nlh = nlmsg_hdr(skb);
+ while (data_len >= nlmsg_total_size(0)) {
+ nlh = (struct nlmsghdr *)data;
+
+ /* NOTE: the nlmsg_len field isn't reliably set by some netlink
+ * users which means we can't reject skb's with bogus
+ * length fields; our solution is to follow what
+ * netlink_rcv_skb() does and simply skip processing at
+ * messages with length fields that are clearly junk
+ */
+ if (nlh->nlmsg_len < NLMSG_HDRLEN || nlh->nlmsg_len > data_len)
+ return 0;
- err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
- if (err) {
- if (err == -EINVAL) {
+ rc = selinux_nlmsg_lookup(sclass, nlh->nlmsg_type, &perm);
+ if (rc == 0) {
+ rc = sock_has_perm(sk, perm);
+ if (rc)
+ return rc;
+ } else if (rc == -EINVAL) {
+ /* -EINVAL is a missing msg/perm mapping */
pr_warn_ratelimited("SELinux: unrecognized netlink"
- " message: protocol=%hu nlmsg_type=%hu sclass=%s"
- " pid=%d comm=%s\n",
- sk->sk_protocol, nlh->nlmsg_type,
- secclass_map[sksec->sclass - 1].name,
- task_pid_nr(current), current->comm);
- if (!enforcing_enabled(&selinux_state) ||
- security_get_allow_unknown(&selinux_state))
- err = 0;
+ " message: protocol=%hu nlmsg_type=%hu sclass=%s"
+ " pid=%d comm=%s\n",
+ sk->sk_protocol, nlh->nlmsg_type,
+ secclass_map[sclass - 1].name,
+ task_pid_nr(current), current->comm);
+ if (enforcing_enabled(&selinux_state) &&
+ !security_get_allow_unknown(&selinux_state))
+ return rc;
+ rc = 0;
+ } else if (rc == -ENOENT) {
+ /* -ENOENT is a missing socket/class mapping, ignore */
+ rc = 0;
+ } else {
+ return rc;
}
- /* Ignore */
- if (err == -ENOENT)
- err = 0;
- goto out;
+ /* move to the next message after applying netlink padding */
+ msg_len = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (msg_len >= data_len)
+ return 0;
+ data_len -= msg_len;
+ data += msg_len;
}
- err = sock_has_perm(sk, perm);
-out:
- return err;
+ return rc;
}
static void ipc_init_security(struct ipc_security_struct *isec, u16 sclass)
@@ -6385,7 +6403,7 @@ static int selinux_setprocattr(const char *name, void *value, size_t size)
/* Permission checking based on the specified context is
performed during the actual operation (execve,
open/mkdir/...), when we know the full context of the
- operation. See selinux_bprm_set_creds for the execve
+ operation. See selinux_bprm_creds_for_exec for the execve
checks and may_create for the file creation checks. The
operation will then fail if the context is not permitted. */
tsec = selinux_cred(new);
@@ -6541,20 +6559,43 @@ static void selinux_key_free(struct key *k)
static int selinux_key_permission(key_ref_t key_ref,
const struct cred *cred,
- unsigned perm)
+ enum key_need_perm need_perm)
{
struct key *key;
struct key_security_struct *ksec;
- u32 sid;
+ u32 perm, sid;
- /* if no specific permissions are requested, we skip the
- permission check. No serious, additional covert channels
- appear to be created. */
- if (perm == 0)
+ switch (need_perm) {
+ case KEY_NEED_VIEW:
+ perm = KEY__VIEW;
+ break;
+ case KEY_NEED_READ:
+ perm = KEY__READ;
+ break;
+ case KEY_NEED_WRITE:
+ perm = KEY__WRITE;
+ break;
+ case KEY_NEED_SEARCH:
+ perm = KEY__SEARCH;
+ break;
+ case KEY_NEED_LINK:
+ perm = KEY__LINK;
+ break;
+ case KEY_NEED_SETATTR:
+ perm = KEY__SETATTR;
+ break;
+ case KEY_NEED_UNLINK:
+ case KEY_SYSADMIN_OVERRIDE:
+ case KEY_AUTHTOKEN_OVERRIDE:
+ case KEY_DEFER_PERM_CHECK:
return 0;
+ default:
+ WARN_ON(1);
+ return -EPERM;
- sid = cred_sid(cred);
+ }
+ sid = cred_sid(cred);
key = key_ref_to_ptr(key_ref);
ksec = key->security;
@@ -6576,6 +6617,17 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer)
*_buffer = context;
return rc;
}
+
+#ifdef CONFIG_KEY_NOTIFICATIONS
+static int selinux_watch_key(struct key *key)
+{
+ struct key_security_struct *ksec = key->security;
+ u32 sid = current_sid();
+
+ return avc_has_perm(&selinux_state,
+ sid, ksec->sid, SECCLASS_KEY, KEY__VIEW, NULL);
+}
+#endif
#endif
#ifdef CONFIG_SECURITY_INFINIBAND
@@ -6914,7 +6966,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(netlink_send, selinux_netlink_send),
- LSM_HOOK_INIT(bprm_set_creds, selinux_bprm_set_creds),
+ LSM_HOOK_INIT(bprm_creds_for_exec, selinux_bprm_creds_for_exec),
LSM_HOOK_INIT(bprm_committing_creds, selinux_bprm_committing_creds),
LSM_HOOK_INIT(bprm_committed_creds, selinux_bprm_committed_creds),
@@ -7091,6 +7143,9 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(key_free, selinux_key_free),
LSM_HOOK_INIT(key_permission, selinux_key_permission),
LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity),
+#ifdef CONFIG_KEY_NOTIFICATIONS
+ LSM_HOOK_INIT(watch_key, selinux_watch_key),
+#endif
#endif
#ifdef CONFIG_AUDIT
diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h
index 986f3ac14282..98e1513b608a 100644
--- a/security/selinux/include/classmap.h
+++ b/security/selinux/include/classmap.h
@@ -27,9 +27,9 @@
"audit_control", "setfcap"
#define COMMON_CAP2_PERMS "mac_override", "mac_admin", "syslog", \
- "wake_alarm", "block_suspend", "audit_read"
+ "wake_alarm", "block_suspend", "audit_read", "perfmon", "bpf"
-#if CAP_LAST_CAP > CAP_AUDIT_READ
+#if CAP_LAST_CAP > CAP_BPF
#error New capability defined, please update COMMON_CAP2_PERMS.
#endif
diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c
index 7a92b028f722..0cc7cdd58465 100644
--- a/security/selinux/ss/conditional.c
+++ b/security/selinux/ss/conditional.c
@@ -424,7 +424,7 @@ int cond_read_list(struct policydb *p, void *fp)
p->cond_list = kcalloc(len, sizeof(*p->cond_list), GFP_KERNEL);
if (!p->cond_list)
- return rc;
+ return -ENOMEM;
rc = avtab_alloc(&(p->te_cond_avtab), p->te_avtab.nel);
if (rc)
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index a30cad18931b..98f343005d6b 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -1054,14 +1054,14 @@ static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
if (!str)
return -ENOMEM;
- /* it's expected the caller should free the str */
- *strp = str;
-
rc = next_entry(str, fp, len);
- if (rc)
+ if (rc) {
+ kfree(str);
return rc;
+ }
str[len] = '\0';
+ *strp = str;
return 0;
}
generated by cgit (git 2.34.1) at 2024-06-19 21:06:20 +0000