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Subject[PATCH] Smackv8: Omit non-cipso labels in cipso_seq_start
From
Hi!,

[Casey, sending patches in public to get an early review]

Omit non-cipso labels in cipso_seq_start().

Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
---
stopping seq_show() if smk_cipso = NULL only fixes the bug
symptom. We'll issue a BUG() in that case cause it signals a
serious misbehavior in the list entries.
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]) {

--
Ahmed S. Darwish
HomePage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com
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