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authorFrederick Lawler <fred@cloudflare.com>2022-08-15 11:20:28 -0500
committerPaul Moore <paul@paul-moore.com>2022-08-16 17:44:44 -0400
commited5d44d42c95e8a13bb54e614d2269c8740667f9 (patch)
tree2a472ce31a076c9cfb1d12825e28fedc7fe582ca /security/selinux
parentd5810139cca39cf2854728b465f8bada4a445302 (diff)
selinux: Implement userns_create hook
Unprivileged user namespace creation is an intended feature to enable sandboxing, however this feature is often used to as an initial step to perform a privilege escalation attack. This patch implements a new user_namespace { create } access control permission to restrict which domains allow or deny user namespace creation. This is necessary for system administrators to quickly protect their systems while waiting for vulnerability patches to be applied. This permission can be used in the following way: allow domA_t domA_t : user_namespace { create }; Signed-off-by: Frederick Lawler <fred@cloudflare.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security/selinux')
-rw-r--r--security/selinux/hooks.c9
-rw-r--r--security/selinux/include/classmap.h2
2 files changed, 11 insertions, 0 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 79573504783b..b9f1078450b3 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4221,6 +4221,14 @@ static void selinux_task_to_inode(struct task_struct *p,
spin_unlock(&isec->lock);
}
+static int selinux_userns_create(const struct cred *cred)
+{
+ u32 sid = current_sid();
+
+ return avc_has_perm(&selinux_state, sid, sid, SECCLASS_USER_NAMESPACE,
+ USER_NAMESPACE__CREATE, NULL);
+}
+
/* Returns error only if unable to parse addresses */
static int selinux_parse_skb_ipv4(struct sk_buff *skb,
struct common_audit_data *ad, u8 *proto)
@@ -7111,6 +7119,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(task_movememory, selinux_task_movememory),
LSM_HOOK_INIT(task_kill, selinux_task_kill),
LSM_HOOK_INIT(task_to_inode, selinux_task_to_inode),
+ LSM_HOOK_INIT(userns_create, selinux_userns_create),
LSM_HOOK_INIT(ipc_permission, selinux_ipc_permission),
LSM_HOOK_INIT(ipc_getsecid, selinux_ipc_getsecid),
diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h
index ff757ae5f253..0bff55bb9cde 100644
--- a/security/selinux/include/classmap.h
+++ b/security/selinux/include/classmap.h
@@ -254,6 +254,8 @@ const struct security_class_mapping secclass_map[] = {
{ COMMON_FILE_PERMS, NULL } },
{ "io_uring",
{ "override_creds", "sqpoll", NULL } },
+ { "user_namespace",
+ { "create", NULL } },
{ NULL }
};