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-rw-r--r--security/smack/smackfs.c52
1 files changed, 22 insertions, 30 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 3e4242617eea..e40dc48737ff 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -566,23 +566,17 @@ static void *smk_seq_start(struct seq_file *s, loff_t *pos,
struct list_head *head)
{
struct list_head *list;
+ int i = *pos;
+
+ rcu_read_lock();
+ for (list = rcu_dereference(list_next_rcu(head));
+ list != head;
+ list = rcu_dereference(list_next_rcu(list))) {
+ if (i-- == 0)
+ return list;
+ }
- /*
- * This is 0 the first time through.
- */
- if (s->index == 0)
- s->private = head;
-
- if (s->private == NULL)
- return NULL;
-
- list = s->private;
- if (list_empty(list))
- return NULL;
-
- if (s->index == 0)
- return list->next;
- return list;
+ return NULL;
}
static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
@@ -590,17 +584,15 @@ static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
{
struct list_head *list = v;
- if (list_is_last(list, head)) {
- s->private = NULL;
- return NULL;
- }
- s->private = list->next;
- return list->next;
+ ++*pos;
+ list = rcu_dereference(list_next_rcu(list));
+
+ return (list == head) ? NULL : list;
}
static void smk_seq_stop(struct seq_file *s, void *v)
{
- /* No-op */
+ rcu_read_unlock();
}
static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
@@ -660,7 +652,7 @@ static int load_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_master_list *smlp =
- list_entry(list, struct smack_master_list, list);
+ list_entry_rcu(list, struct smack_master_list, list);
smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
@@ -808,7 +800,7 @@ static int cipso_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_known *skp =
- list_entry(list, struct smack_known, list);
+ list_entry_rcu(list, struct smack_known, list);
struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
char sep = '/';
int i;
@@ -999,7 +991,7 @@ static int cipso2_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_known *skp =
- list_entry(list, struct smack_known, list);
+ list_entry_rcu(list, struct smack_known, list);
struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
char sep = '/';
int i;
@@ -1083,7 +1075,7 @@ static int netlbladdr_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smk_netlbladdr *skp =
- list_entry(list, struct smk_netlbladdr, list);
+ list_entry_rcu(list, struct smk_netlbladdr, list);
unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
int maskn;
u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
@@ -1917,7 +1909,7 @@ static int load_self_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_rule *srp =
- list_entry(list, struct smack_rule, list);
+ list_entry_rcu(list, struct smack_rule, list);
smk_rule_show(s, srp, SMK_LABELLEN);
@@ -2046,7 +2038,7 @@ static int load2_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_master_list *smlp =
- list_entry(list, struct smack_master_list, list);
+ list_entry_rcu(list, struct smack_master_list, list);
smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
@@ -2123,7 +2115,7 @@ static int load_self2_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_rule *srp =
- list_entry(list, struct smack_rule, list);
+ list_entry_rcu(list, struct smack_rule, list);
smk_rule_show(s, srp, SMK_LONGLABEL);