[PATCH v2 1/2] security: convert security hooks to use hlist
Casey Schaufler
casey at schaufler-ca.com
Wed Mar 28 16:47:10 UTC 2018
On 3/27/2018 6:30 PM, Sargun Dhillon wrote:
> This changes security_hook_heads to use hlist_heads instead of
> the circular doubly-linked list heads. This should cut down
> the size of the struct by about half.
>
> In addition, it allows mutation of the hooks at the tail of the
> callback list without having to modify the head. The longer-term
> purpose of this is to enable making the heads read only.
>
> Signed-off-by: Sargun Dhillon <sargun at sargun.me>
I should have used hlist in the first place.
Acked-by: Casey Schaufler <casey at schaufler-ca.com>
> ---
> include/linux/lsm_hooks.h | 428 +++++++++++++++++++++++-----------------------
> security/security.c | 22 +--
> 2 files changed, 225 insertions(+), 225 deletions(-)
>
> diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
> index 7161d8e7ee79..09bc60fb35f1 100644
> --- a/include/linux/lsm_hooks.h
> +++ b/include/linux/lsm_hooks.h
> @@ -1730,230 +1730,230 @@ union security_list_options {
> };
>
> struct security_hook_heads {
> - struct list_head binder_set_context_mgr;
> - struct list_head binder_transaction;
> - struct list_head binder_transfer_binder;
> - struct list_head binder_transfer_file;
> - struct list_head ptrace_access_check;
> - struct list_head ptrace_traceme;
> - struct list_head capget;
> - struct list_head capset;
> - struct list_head capable;
> - struct list_head quotactl;
> - struct list_head quota_on;
> - struct list_head syslog;
> - struct list_head settime;
> - struct list_head vm_enough_memory;
> - struct list_head bprm_set_creds;
> - struct list_head bprm_check_security;
> - struct list_head bprm_committing_creds;
> - struct list_head bprm_committed_creds;
> - struct list_head sb_alloc_security;
> - struct list_head sb_free_security;
> - struct list_head sb_copy_data;
> - struct list_head sb_remount;
> - struct list_head sb_kern_mount;
> - struct list_head sb_show_options;
> - struct list_head sb_statfs;
> - struct list_head sb_mount;
> - struct list_head sb_umount;
> - struct list_head sb_pivotroot;
> - struct list_head sb_set_mnt_opts;
> - struct list_head sb_clone_mnt_opts;
> - struct list_head sb_parse_opts_str;
> - struct list_head dentry_init_security;
> - struct list_head dentry_create_files_as;
> + struct hlist_head binder_set_context_mgr;
> + struct hlist_head binder_transaction;
> + struct hlist_head binder_transfer_binder;
> + struct hlist_head binder_transfer_file;
> + struct hlist_head ptrace_access_check;
> + struct hlist_head ptrace_traceme;
> + struct hlist_head capget;
> + struct hlist_head capset;
> + struct hlist_head capable;
> + struct hlist_head quotactl;
> + struct hlist_head quota_on;
> + struct hlist_head syslog;
> + struct hlist_head settime;
> + struct hlist_head vm_enough_memory;
> + struct hlist_head bprm_set_creds;
> + struct hlist_head bprm_check_security;
> + struct hlist_head bprm_committing_creds;
> + struct hlist_head bprm_committed_creds;
> + struct hlist_head sb_alloc_security;
> + struct hlist_head sb_free_security;
> + struct hlist_head sb_copy_data;
> + struct hlist_head sb_remount;
> + struct hlist_head sb_kern_mount;
> + struct hlist_head sb_show_options;
> + struct hlist_head sb_statfs;
> + struct hlist_head sb_mount;
> + struct hlist_head sb_umount;
> + struct hlist_head sb_pivotroot;
> + struct hlist_head sb_set_mnt_opts;
> + struct hlist_head sb_clone_mnt_opts;
> + struct hlist_head sb_parse_opts_str;
> + struct hlist_head dentry_init_security;
> + struct hlist_head dentry_create_files_as;
> #ifdef CONFIG_SECURITY_PATH
> - struct list_head path_unlink;
> - struct list_head path_mkdir;
> - struct list_head path_rmdir;
> - struct list_head path_mknod;
> - struct list_head path_truncate;
> - struct list_head path_symlink;
> - struct list_head path_link;
> - struct list_head path_rename;
> - struct list_head path_chmod;
> - struct list_head path_chown;
> - struct list_head path_chroot;
> + struct hlist_head path_unlink;
> + struct hlist_head path_mkdir;
> + struct hlist_head path_rmdir;
> + struct hlist_head path_mknod;
> + struct hlist_head path_truncate;
> + struct hlist_head path_symlink;
> + struct hlist_head path_link;
> + struct hlist_head path_rename;
> + struct hlist_head path_chmod;
> + struct hlist_head path_chown;
> + struct hlist_head path_chroot;
> #endif
> - struct list_head inode_alloc_security;
> - struct list_head inode_free_security;
> - struct list_head inode_init_security;
> - struct list_head inode_create;
> - struct list_head inode_link;
> - struct list_head inode_unlink;
> - struct list_head inode_symlink;
> - struct list_head inode_mkdir;
> - struct list_head inode_rmdir;
> - struct list_head inode_mknod;
> - struct list_head inode_rename;
> - struct list_head inode_readlink;
> - struct list_head inode_follow_link;
> - struct list_head inode_permission;
> - struct list_head inode_setattr;
> - struct list_head inode_getattr;
> - struct list_head inode_setxattr;
> - struct list_head inode_post_setxattr;
> - struct list_head inode_getxattr;
> - struct list_head inode_listxattr;
> - struct list_head inode_removexattr;
> - struct list_head inode_need_killpriv;
> - struct list_head inode_killpriv;
> - struct list_head inode_getsecurity;
> - struct list_head inode_setsecurity;
> - struct list_head inode_listsecurity;
> - struct list_head inode_getsecid;
> - struct list_head inode_copy_up;
> - struct list_head inode_copy_up_xattr;
> - struct list_head file_permission;
> - struct list_head file_alloc_security;
> - struct list_head file_free_security;
> - struct list_head file_ioctl;
> - struct list_head mmap_addr;
> - struct list_head mmap_file;
> - struct list_head file_mprotect;
> - struct list_head file_lock;
> - struct list_head file_fcntl;
> - struct list_head file_set_fowner;
> - struct list_head file_send_sigiotask;
> - struct list_head file_receive;
> - struct list_head file_open;
> - struct list_head task_alloc;
> - struct list_head task_free;
> - struct list_head cred_alloc_blank;
> - struct list_head cred_free;
> - struct list_head cred_prepare;
> - struct list_head cred_transfer;
> - struct list_head kernel_act_as;
> - struct list_head kernel_create_files_as;
> - struct list_head kernel_read_file;
> - struct list_head kernel_post_read_file;
> - struct list_head kernel_module_request;
> - struct list_head task_fix_setuid;
> - struct list_head task_setpgid;
> - struct list_head task_getpgid;
> - struct list_head task_getsid;
> - struct list_head task_getsecid;
> - struct list_head task_setnice;
> - struct list_head task_setioprio;
> - struct list_head task_getioprio;
> - struct list_head task_prlimit;
> - struct list_head task_setrlimit;
> - struct list_head task_setscheduler;
> - struct list_head task_getscheduler;
> - struct list_head task_movememory;
> - struct list_head task_kill;
> - struct list_head task_prctl;
> - struct list_head task_to_inode;
> - struct list_head ipc_permission;
> - struct list_head ipc_getsecid;
> - struct list_head msg_msg_alloc_security;
> - struct list_head msg_msg_free_security;
> - struct list_head msg_queue_alloc_security;
> - struct list_head msg_queue_free_security;
> - struct list_head msg_queue_associate;
> - struct list_head msg_queue_msgctl;
> - struct list_head msg_queue_msgsnd;
> - struct list_head msg_queue_msgrcv;
> - struct list_head shm_alloc_security;
> - struct list_head shm_free_security;
> - struct list_head shm_associate;
> - struct list_head shm_shmctl;
> - struct list_head shm_shmat;
> - struct list_head sem_alloc_security;
> - struct list_head sem_free_security;
> - struct list_head sem_associate;
> - struct list_head sem_semctl;
> - struct list_head sem_semop;
> - struct list_head netlink_send;
> - struct list_head d_instantiate;
> - struct list_head getprocattr;
> - struct list_head setprocattr;
> - struct list_head ismaclabel;
> - struct list_head secid_to_secctx;
> - struct list_head secctx_to_secid;
> - struct list_head release_secctx;
> - struct list_head inode_invalidate_secctx;
> - struct list_head inode_notifysecctx;
> - struct list_head inode_setsecctx;
> - struct list_head inode_getsecctx;
> + struct hlist_head inode_alloc_security;
> + struct hlist_head inode_free_security;
> + struct hlist_head inode_init_security;
> + struct hlist_head inode_create;
> + struct hlist_head inode_link;
> + struct hlist_head inode_unlink;
> + struct hlist_head inode_symlink;
> + struct hlist_head inode_mkdir;
> + struct hlist_head inode_rmdir;
> + struct hlist_head inode_mknod;
> + struct hlist_head inode_rename;
> + struct hlist_head inode_readlink;
> + struct hlist_head inode_follow_link;
> + struct hlist_head inode_permission;
> + struct hlist_head inode_setattr;
> + struct hlist_head inode_getattr;
> + struct hlist_head inode_setxattr;
> + struct hlist_head inode_post_setxattr;
> + struct hlist_head inode_getxattr;
> + struct hlist_head inode_listxattr;
> + struct hlist_head inode_removexattr;
> + struct hlist_head inode_need_killpriv;
> + struct hlist_head inode_killpriv;
> + struct hlist_head inode_getsecurity;
> + struct hlist_head inode_setsecurity;
> + struct hlist_head inode_listsecurity;
> + struct hlist_head inode_getsecid;
> + struct hlist_head inode_copy_up;
> + struct hlist_head inode_copy_up_xattr;
> + struct hlist_head file_permission;
> + struct hlist_head file_alloc_security;
> + struct hlist_head file_free_security;
> + struct hlist_head file_ioctl;
> + struct hlist_head mmap_addr;
> + struct hlist_head mmap_file;
> + struct hlist_head file_mprotect;
> + struct hlist_head file_lock;
> + struct hlist_head file_fcntl;
> + struct hlist_head file_set_fowner;
> + struct hlist_head file_send_sigiotask;
> + struct hlist_head file_receive;
> + struct hlist_head file_open;
> + struct hlist_head task_alloc;
> + struct hlist_head task_free;
> + struct hlist_head cred_alloc_blank;
> + struct hlist_head cred_free;
> + struct hlist_head cred_prepare;
> + struct hlist_head cred_transfer;
> + struct hlist_head kernel_act_as;
> + struct hlist_head kernel_create_files_as;
> + struct hlist_head kernel_read_file;
> + struct hlist_head kernel_post_read_file;
> + struct hlist_head kernel_module_request;
> + struct hlist_head task_fix_setuid;
> + struct hlist_head task_setpgid;
> + struct hlist_head task_getpgid;
> + struct hlist_head task_getsid;
> + struct hlist_head task_getsecid;
> + struct hlist_head task_setnice;
> + struct hlist_head task_setioprio;
> + struct hlist_head task_getioprio;
> + struct hlist_head task_prlimit;
> + struct hlist_head task_setrlimit;
> + struct hlist_head task_setscheduler;
> + struct hlist_head task_getscheduler;
> + struct hlist_head task_movememory;
> + struct hlist_head task_kill;
> + struct hlist_head task_prctl;
> + struct hlist_head task_to_inode;
> + struct hlist_head ipc_permission;
> + struct hlist_head ipc_getsecid;
> + struct hlist_head msg_msg_alloc_security;
> + struct hlist_head msg_msg_free_security;
> + struct hlist_head msg_queue_alloc_security;
> + struct hlist_head msg_queue_free_security;
> + struct hlist_head msg_queue_associate;
> + struct hlist_head msg_queue_msgctl;
> + struct hlist_head msg_queue_msgsnd;
> + struct hlist_head msg_queue_msgrcv;
> + struct hlist_head shm_alloc_security;
> + struct hlist_head shm_free_security;
> + struct hlist_head shm_associate;
> + struct hlist_head shm_shmctl;
> + struct hlist_head shm_shmat;
> + struct hlist_head sem_alloc_security;
> + struct hlist_head sem_free_security;
> + struct hlist_head sem_associate;
> + struct hlist_head sem_semctl;
> + struct hlist_head sem_semop;
> + struct hlist_head netlink_send;
> + struct hlist_head d_instantiate;
> + struct hlist_head getprocattr;
> + struct hlist_head setprocattr;
> + struct hlist_head ismaclabel;
> + struct hlist_head secid_to_secctx;
> + struct hlist_head secctx_to_secid;
> + struct hlist_head release_secctx;
> + struct hlist_head inode_invalidate_secctx;
> + struct hlist_head inode_notifysecctx;
> + struct hlist_head inode_setsecctx;
> + struct hlist_head inode_getsecctx;
> #ifdef CONFIG_SECURITY_NETWORK
> - struct list_head unix_stream_connect;
> - struct list_head unix_may_send;
> - struct list_head socket_create;
> - struct list_head socket_post_create;
> - struct list_head socket_bind;
> - struct list_head socket_connect;
> - struct list_head socket_listen;
> - struct list_head socket_accept;
> - struct list_head socket_sendmsg;
> - struct list_head socket_recvmsg;
> - struct list_head socket_getsockname;
> - struct list_head socket_getpeername;
> - struct list_head socket_getsockopt;
> - struct list_head socket_setsockopt;
> - struct list_head socket_shutdown;
> - struct list_head socket_sock_rcv_skb;
> - struct list_head socket_getpeersec_stream;
> - struct list_head socket_getpeersec_dgram;
> - struct list_head sk_alloc_security;
> - struct list_head sk_free_security;
> - struct list_head sk_clone_security;
> - struct list_head sk_getsecid;
> - struct list_head sock_graft;
> - struct list_head inet_conn_request;
> - struct list_head inet_csk_clone;
> - struct list_head inet_conn_established;
> - struct list_head secmark_relabel_packet;
> - struct list_head secmark_refcount_inc;
> - struct list_head secmark_refcount_dec;
> - struct list_head req_classify_flow;
> - struct list_head tun_dev_alloc_security;
> - struct list_head tun_dev_free_security;
> - struct list_head tun_dev_create;
> - struct list_head tun_dev_attach_queue;
> - struct list_head tun_dev_attach;
> - struct list_head tun_dev_open;
> + struct hlist_head unix_stream_connect;
> + struct hlist_head unix_may_send;
> + struct hlist_head socket_create;
> + struct hlist_head socket_post_create;
> + struct hlist_head socket_bind;
> + struct hlist_head socket_connect;
> + struct hlist_head socket_listen;
> + struct hlist_head socket_accept;
> + struct hlist_head socket_sendmsg;
> + struct hlist_head socket_recvmsg;
> + struct hlist_head socket_getsockname;
> + struct hlist_head socket_getpeername;
> + struct hlist_head socket_getsockopt;
> + struct hlist_head socket_setsockopt;
> + struct hlist_head socket_shutdown;
> + struct hlist_head socket_sock_rcv_skb;
> + struct hlist_head socket_getpeersec_stream;
> + struct hlist_head socket_getpeersec_dgram;
> + struct hlist_head sk_alloc_security;
> + struct hlist_head sk_free_security;
> + struct hlist_head sk_clone_security;
> + struct hlist_head sk_getsecid;
> + struct hlist_head sock_graft;
> + struct hlist_head inet_conn_request;
> + struct hlist_head inet_csk_clone;
> + struct hlist_head inet_conn_established;
> + struct hlist_head secmark_relabel_packet;
> + struct hlist_head secmark_refcount_inc;
> + struct hlist_head secmark_refcount_dec;
> + struct hlist_head req_classify_flow;
> + struct hlist_head tun_dev_alloc_security;
> + struct hlist_head tun_dev_free_security;
> + struct hlist_head tun_dev_create;
> + struct hlist_head tun_dev_attach_queue;
> + struct hlist_head tun_dev_attach;
> + struct hlist_head tun_dev_open;
> #endif /* CONFIG_SECURITY_NETWORK */
> #ifdef CONFIG_SECURITY_INFINIBAND
> - struct list_head ib_pkey_access;
> - struct list_head ib_endport_manage_subnet;
> - struct list_head ib_alloc_security;
> - struct list_head ib_free_security;
> + struct hlist_head ib_pkey_access;
> + struct hlist_head ib_endport_manage_subnet;
> + struct hlist_head ib_alloc_security;
> + struct hlist_head ib_free_security;
> #endif /* CONFIG_SECURITY_INFINIBAND */
> #ifdef CONFIG_SECURITY_NETWORK_XFRM
> - struct list_head xfrm_policy_alloc_security;
> - struct list_head xfrm_policy_clone_security;
> - struct list_head xfrm_policy_free_security;
> - struct list_head xfrm_policy_delete_security;
> - struct list_head xfrm_state_alloc;
> - struct list_head xfrm_state_alloc_acquire;
> - struct list_head xfrm_state_free_security;
> - struct list_head xfrm_state_delete_security;
> - struct list_head xfrm_policy_lookup;
> - struct list_head xfrm_state_pol_flow_match;
> - struct list_head xfrm_decode_session;
> + struct hlist_head xfrm_policy_alloc_security;
> + struct hlist_head xfrm_policy_clone_security;
> + struct hlist_head xfrm_policy_free_security;
> + struct hlist_head xfrm_policy_delete_security;
> + struct hlist_head xfrm_state_alloc;
> + struct hlist_head xfrm_state_alloc_acquire;
> + struct hlist_head xfrm_state_free_security;
> + struct hlist_head xfrm_state_delete_security;
> + struct hlist_head xfrm_policy_lookup;
> + struct hlist_head xfrm_state_pol_flow_match;
> + struct hlist_head xfrm_decode_session;
> #endif /* CONFIG_SECURITY_NETWORK_XFRM */
> #ifdef CONFIG_KEYS
> - struct list_head key_alloc;
> - struct list_head key_free;
> - struct list_head key_permission;
> - struct list_head key_getsecurity;
> + struct hlist_head key_alloc;
> + struct hlist_head key_free;
> + struct hlist_head key_permission;
> + struct hlist_head key_getsecurity;
> #endif /* CONFIG_KEYS */
> #ifdef CONFIG_AUDIT
> - struct list_head audit_rule_init;
> - struct list_head audit_rule_known;
> - struct list_head audit_rule_match;
> - struct list_head audit_rule_free;
> + struct hlist_head audit_rule_init;
> + struct hlist_head audit_rule_known;
> + struct hlist_head audit_rule_match;
> + struct hlist_head audit_rule_free;
> #endif /* CONFIG_AUDIT */
> #ifdef CONFIG_BPF_SYSCALL
> - struct list_head bpf;
> - struct list_head bpf_map;
> - struct list_head bpf_prog;
> - struct list_head bpf_map_alloc_security;
> - struct list_head bpf_map_free_security;
> - struct list_head bpf_prog_alloc_security;
> - struct list_head bpf_prog_free_security;
> + struct hlist_head bpf;
> + struct hlist_head bpf_map;
> + struct hlist_head bpf_prog;
> + struct hlist_head bpf_map_alloc_security;
> + struct hlist_head bpf_map_free_security;
> + struct hlist_head bpf_prog_alloc_security;
> + struct hlist_head bpf_prog_free_security;
> #endif /* CONFIG_BPF_SYSCALL */
> } __randomize_layout;
>
> @@ -1962,8 +1962,8 @@ struct security_hook_heads {
> * For use with generic list macros for common operations.
> */
> struct security_hook_list {
> - struct list_head list;
> - struct list_head *head;
> + struct hlist_node list;
> + struct hlist_head *head;
> union security_list_options hook;
> char *lsm;
> } __randomize_layout;
> @@ -2002,7 +2002,7 @@ static inline void security_delete_hooks(struct security_hook_list *hooks,
> int i;
>
> for (i = 0; i < count; i++)
> - list_del_rcu(&hooks[i].list);
> + hlist_del_rcu(&hooks[i].list);
> }
> #endif /* CONFIG_SECURITY_SELINUX_DISABLE */
>
> diff --git a/security/security.c b/security/security.c
> index 1cd8526cb0b7..3cafff61b049 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -61,11 +61,11 @@ static void __init do_security_initcalls(void)
> int __init security_init(void)
> {
> int i;
> - struct list_head *list = (struct list_head *) &security_hook_heads;
> + struct hlist_head *list = (struct hlist_head *) &security_hook_heads;
>
> - for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct list_head);
> + for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct hlist_head);
> i++)
> - INIT_LIST_HEAD(&list[i]);
> + INIT_HLIST_HEAD(&list[i]);
> pr_info("Security Framework initialized\n");
>
> /*
> @@ -163,7 +163,7 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
>
> for (i = 0; i < count; i++) {
> hooks[i].lsm = lsm;
> - list_add_tail_rcu(&hooks[i].list, hooks[i].head);
> + hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
> }
> if (lsm_append(lsm, &lsm_names) < 0)
> panic("%s - Cannot get early memory.\n", __func__);
> @@ -201,7 +201,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
> do { \
> struct security_hook_list *P; \
> \
> - list_for_each_entry(P, &security_hook_heads.FUNC, list) \
> + hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
> P->hook.FUNC(__VA_ARGS__); \
> } while (0)
>
> @@ -210,7 +210,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
> do { \
> struct security_hook_list *P; \
> \
> - list_for_each_entry(P, &security_hook_heads.FUNC, list) { \
> + hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
> RC = P->hook.FUNC(__VA_ARGS__); \
> if (RC != 0) \
> break; \
> @@ -317,7 +317,7 @@ int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
> * agree that it should be set it will. If any module
> * thinks it should not be set it won't.
> */
> - list_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
> + hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
> rc = hp->hook.vm_enough_memory(mm, pages);
> if (rc <= 0) {
> cap_sys_admin = 0;
> @@ -805,7 +805,7 @@ int security_inode_getsecurity(struct inode *inode, const char *name, void **buf
> /*
> * Only one module will provide an attribute with a given name.
> */
> - list_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
> + hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
> rc = hp->hook.inode_getsecurity(inode, name, buffer, alloc);
> if (rc != -EOPNOTSUPP)
> return rc;
> @@ -823,7 +823,7 @@ int security_inode_setsecurity(struct inode *inode, const char *name, const void
> /*
> * Only one module will provide an attribute with a given name.
> */
> - list_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
> + hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
> rc = hp->hook.inode_setsecurity(inode, name, value, size,
> flags);
> if (rc != -EOPNOTSUPP)
> @@ -1126,7 +1126,7 @@ int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
> int rc = -ENOSYS;
> struct security_hook_list *hp;
>
> - list_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
> + hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
> thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
> if (thisrc != -ENOSYS) {
> rc = thisrc;
> @@ -1629,7 +1629,7 @@ int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
> * For speed optimization, we explicitly break the loop rather than
> * using the macro
> */
> - list_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
> + hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
> list) {
> rc = hp->hook.xfrm_state_pol_flow_match(x, xp, fl);
> break;
--
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