From: Daniel Jurgens <dani...@mellanox.com>
Add a generic notificaiton mechanism in the LSM. Interested consumers
can register a callback with the LSM and security modules can produce
events.
Because access to Infiniband QPs are enforced in the setup phase of a
connection security should be enforced again if the policy changes.
Register infiniband devices for policy change notification and check all
QPs on that device when the notification is received.
Add a call to the notification mechanism is from SELinux when the AVC
cache changes.
Signed-off-by: Daniel Jurgens <dani...@mellanox.com>
---
v2:
- new patch that has the generic notification, replaces selinux and
IB/core patches related to the ib_flush callback. Yuval Shaia and Paul
Moore
---
drivers/infiniband/core/device.c | 46 ++++++++++++++++++++++++++++++
include/linux/security.h | 10 ++++++
security/security.c | 58 ++++++++++++++++++++++++++++++++++++++
security/selinux/hooks.c | 5 ++-
security/selinux/selinuxfs.c | 2 +
5 files changed, 119 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 5b42e83..3219a7a 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -39,6 +39,7 @@
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
+#include <linux/security.h>
#include <rdma/rdma_netlink.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>
@@ -82,6 +83,10 @@ static LIST_HEAD(client_list);
static DEFINE_MUTEX(device_mutex);
static DECLARE_RWSEM(lists_rwsem);
+static void ib_policy_change_task(struct work_struct *work);
+static DECLARE_WORK(ib_policy_change_work, ib_policy_change_task);
+
+static u32 lsm_callback_id;
static int ib_device_check_mandatory(struct ib_device *device)
{
@@ -344,6 +349,37 @@ static int setup_port_pkey_list(struct ib_device *device)
return 0;
}
+static void ib_policy_change_task(struct work_struct *work)
+{
+ struct ib_device *dev;
+
+ down_read(&lists_rwsem);
+ list_for_each_entry(dev, &device_list, core_list) {
+ int i;
+
+ for (i = rdma_start_port(dev); i <= rdma_end_port(dev); i++) {
+ u64 sp;
+ int ret = ib_get_cached_subnet_prefix(dev,
+ i,
+ &sp);
+
+ WARN_ONCE(ret,
+ "ib_get_cached_subnet_prefix err: %d, this
should never happen here\n",
+ ret);
+ ib_security_cache_change(dev, i, sp);
+ }
+ }
+ up_read(&lists_rwsem);
+}
+
+static void ib_security_change(enum lsm_event event, void *ctx, void *lsm_data)
+{
+ if (event != LSM_POLICY_CHANGE)
+ return;
+
+ schedule_work(&ib_policy_change_work);
+}
+
/**
* ib_register_device - Register an IB device with IB core
* @device:Device to register
@@ -1075,10 +1111,19 @@ static int __init ib_core_init(void)
goto err_sa;
}
+ ret = security_register_lsm_notifier(&ib_security_change, NULL,
+ &lsm_callback_id);
+ if (ret) {
+ pr_warn("Couldn't register LSM notifier. ret %d\n", ret);
+ goto err_ibnl_clients;
+ }
+
ib_cache_setup();
return 0;
+err_ibnl_clients:
+ ib_remove_ibnl_clients();
err_sa:
ib_sa_cleanup();
err_mad:
@@ -1098,6 +1143,7 @@ err:
static void __exit ib_core_cleanup(void)
{
+ security_unregister_lsm_notifier(lsm_callback_id);
ib_cache_cleanup();
ib_remove_ibnl_clients();
ib_sa_cleanup();
diff --git a/include/linux/security.h b/include/linux/security.h
index 33e23c4..bf53911 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -69,6 +69,16 @@ struct audit_krule;
struct user_namespace;
struct timezone;
+enum lsm_event {
+ LSM_POLICY_CHANGE,
+};
+
+typedef void (*lsm_notifier)(enum lsm_event event, void *ctx, void *data);
+
+void security_lsm_notify(enum lsm_event event, void *data);
+int security_register_lsm_notifier(lsm_notifier func, void *ctx, u32 *id);
+void security_unregister_lsm_notifier(u32 id);
+
/* These functions are in security/commoncap.c */
extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
int cap, int audit);
diff --git a/security/security.c b/security/security.c
index 234982d..1263c1d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -33,6 +33,18 @@
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX 10
+struct lsm_notifier_entry {
+ u32 callback_id;
+ lsm_notifier func;
+ void *ctx;
+ struct list_head list;
+ struct rcu_head rcu;
+};
+
+static LIST_HEAD(lsm_notifier_list);
+static DEFINE_SPINLOCK(lsm_notifier_lock);
+static u32 next_callback_id;
+
/* Boot-time LSM user choice */
static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
CONFIG_DEFAULT_SECURITY;
@@ -98,6 +110,52 @@ int __init security_module_enable(const char *module)
return !strcmp(module, chosen_lsm);
}
+void security_lsm_notify(enum lsm_event event, void *data)
+{
+ struct lsm_notifier_entry *entry;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(entry, &lsm_notifier_list, list)
+ entry->func(event, entry->ctx, data);
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(security_lsm_notify);
+
+int security_register_lsm_notifier(lsm_notifier func, void *ctx, u32 *id)
+{
+ struct lsm_notifier_entry *entry;
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ entry->func = func;
+ entry->ctx = ctx;
+
+ spin_lock(&lsm_notifier_lock);
+ entry->callback_id = next_callback_id++;
+ *id = entry->callback_id;
+ list_add_rcu(&entry->list, &lsm_notifier_list);
+ spin_unlock(&lsm_notifier_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(security_register_lsm_notifier);
+
+void security_unregister_lsm_notifier(u32 id)
+{
+ struct lsm_notifier_entry *entry;
+
+ list_for_each_entry_rcu(entry, &lsm_notifier_list, list) {
+ if (entry->callback_id == id) {
+ list_del_rcu(&entry->list);
+ kfree_rcu(entry, rcu);
+ break;
+ }
+ }
+}
+EXPORT_SYMBOL(security_unregister_lsm_notifier);
+
/*
* Hook list operation macros.
*
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index a86d537..a363202 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -159,13 +159,14 @@ static int selinux_peerlbl_enabled(void)
return (selinux_policycap_alwaysnetwork || netlbl_enabled() ||
selinux_xfrm_enabled());
}
-static int selinux_netcache_avc_callback(u32 event)
+static int selinux_cache_avc_callback(u32 event)
{
if (event == AVC_CALLBACK_RESET) {
sel_netif_flush();
sel_netnode_flush();
sel_netport_flush();
synchronize_net();
+ security_lsm_notify(LSM_POLICY_CHANGE, NULL);
}
return 0;
}
@@ -6235,7 +6236,7 @@ static __init int selinux_init(void)
security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks));
- if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET))
+ if (avc_add_callback(selinux_cache_avc_callback, AVC_CALLBACK_RESET))
panic("SELinux: Unable to register AVC netcache callback\n");
if (selinux_enforcing)
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 1b1fd27..adc09e7 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -177,6 +177,8 @@ static ssize_t sel_write_enforce(struct file *file, const
char __user *buf,
avc_ss_reset(0);
selnl_notify_setenforce(selinux_enforcing);
selinux_status_update_setenforce(selinux_enforcing);
+ if (!selinux_enforcing)
+ security_lsm_notify(LSM_POLICY_CHANGE, NULL);
}
length = count;
out:
--
1.7.1
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