Hi,
Utilizing Al's concers about using smack_cipso_count without locking,
here's a patch that remove smack_cipso_count and uses simple list
traversing in read() without any counting mechanism.
CC: Al Viro <[email protected]>
Signed-off-by: Ahmed S. Darwish <[email protected]>
---
Please apply over omit-non-cipso-lables-in-cipso-seq-start.patch
Using smack_{list,cipso}_count in the read context was useless
anyway cause we were just traversing the list.
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index b061cd0..c38d0d0 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -63,16 +63,17 @@ int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
static int smack_list_count;
-static int smack_cipso_count;
struct smk_list_entry *smack_list;
+#define SEQ_READ_FINISHED 1
+
/*
* Seq_file read operations for /smack/load
*/
static void *load_seq_start(struct seq_file *s, loff_t *pos)
{
- if (*pos >= smack_list_count)
+ if (*pos == SEQ_READ_FINISHED)
return NULL;
return smack_list;
@@ -80,8 +81,13 @@ static void *load_seq_start(struct seq_file *s, loff_t *pos)
static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
- (*pos)++;
- return ((struct smk_list_entry *) v)->smk_next;
+ struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
+
+ if (skp)
+ return skp;
+
+ *pos = SEQ_READ_FINISHED;
+ return NULL;
}
static int load_seq_show(struct seq_file *s, void *v)
@@ -306,7 +312,7 @@ static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
{
struct smack_known *skp = smack_known;
- if (*pos >= smack_cipso_count)
+ if (*pos == SEQ_READ_FINISHED)
return NULL;
while (skp && !skp->smk_cipso)
@@ -319,12 +325,14 @@ static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct smack_known *skp = ((struct smack_known *) v)->smk_next;
- (*pos)++;
-
while (skp && !skp->smk_cipso)
skp = skp->smk_next;
- return skp;
+ if (skp)
+ return skp;
+
+ *pos = SEQ_READ_FINISHED;
+ return NULL;
}
/*
@@ -488,7 +496,6 @@ static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
rc = -ENOMEM;
break;
}
- ++smack_cipso_count;
} else
scp = NULL;
--
Ahmed S. Darwish
HomePage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com
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