[RFC PATCH 1/2] security: convert security hooks to use hlist
Sargun Dhillon
sargun at sargun.me
Mon Mar 26 19:24:13 UTC 2018
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.
Signed-off-by: Sargun Dhillon <sargun at sargun.me>
---
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;
--
2.14.1
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