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authorSargun Dhillon <sargun@sargun.me>2018-03-29 01:28:23 +0000
committerJames Morris <james.morris@microsoft.com>2018-03-31 13:18:27 +1100
commitdf0ce17331e2501dbffc060041dfc6c5f85227b5 (patch)
tree0336a2aa616f738572946bd41bdfbbe1efbf3a83 /security
parent5893ed18a26d1f56b97c0290b0cbbc2d49d6de28 (diff)
downloadlinux-stericsson-df0ce17331e2501dbffc060041dfc6c5f85227b5.tar.gz
security: convert security hooks to use hlist
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@sargun.me> Reviewed-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: James Morris <james.morris@microsoft.com>
Diffstat (limited to 'security')
-rw-r--r--security/security.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/security/security.c b/security/security.c
index 14c291910d25..dd246a38b3f0 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;