Hi Casey,
Casey <[EMAIL PROTECTED]> wrote:
>
> This version is again aimed at addressing Al Viro's issues in
> smackfs. Ahmed Darwish has again contributed in the repair of the
> locking issues there. The move to 2.6.24 was also an important
> release incentive.
>
My patches mentiond above is not applied in this version. The same
lock issues remain. Did you forget applying them ? In that case,
here're the same patches again (on ver8):
==> 1:
cipso_seq_show should not be passed smack labels with no cipso
mapping. Omit non-cipso mapped labels in cipso_seq_start and
BUG in case cipso_seq_show was passed a non-cipso label.
Signed-off-by: Ahmed S. Darwish <[EMAIL PROTECTED]>
---
smackv8-omit-noncipso-in-seq-start.patch
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 55ba2dc..b061cd0 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -297,14 +297,22 @@ void smk_cipso_doi(void)
/*
* Seq_file read operations for /smack/cipso
+ *
+ * Omit labels with no associated cipso values from being
+ * displayed in seq_show()
*/
static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
{
+ struct smack_known *skp = smack_known;
+
if (*pos >= smack_cipso_count)
return NULL;
- return smack_known;
+ while (skp && !skp->smk_cipso)
+ skp = skp->smk_next;
+
+ return skp;
}
static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
@@ -313,9 +321,6 @@ static void *cipso_seq_next(struct seq_file *s, void *v,
loff_t *pos)
(*pos)++;
- /*
- * Omit labels with no associated cipso value
- */
while (skp && !skp->smk_cipso)
skp = skp->smk_next;
@@ -336,12 +341,11 @@ static int cipso_seq_show(struct seq_file *s, void *v)
int i;
unsigned char m;
- if (scp == NULL)
- return 0;
+ BUG_ON(!scp);
+ cbp = scp->smk_catset;
seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
- cbp = scp->smk_catset;
for (i = 0; i < SMK_LABELLEN; i++)
for (m = 0x80; m != 0; m >>= 1) {
if (m & cbp[i]) {
==> 2:
Avoid racy use of smack_{list,cipso}_count in traversing lists.
Simple smack_list and smack_known lockless list traversal is all
what's needed.
Signed-off-by: Ahmed S. Darwish <[EMAIL PROTECTED]>
---
smackv8-lockless-read.patch
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index b061cd0..e343827 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 +81,12 @@ 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)
+ *pos = SEQ_READ_FINISHED;
+
+ return skp;
}
static int load_seq_show(struct seq_file *s, void *v)
@@ -306,7 +311,7 @@ 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)
@@ -319,11 +324,12 @@ 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;
+ if (!skp)
+ *pos = SEQ_READ_FINISHED;
+
return skp;
}
@@ -488,7 +494,6 @@ 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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