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authorJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2013-11-28 19:16:46 +0200
committerCasey Schaufler <casey@schaufler-ca.com>2013-12-11 10:48:55 -0800
commit398ce073700a2a3e86b5a0b1edecdddfa3996b27 (patch)
tree81ebb8780ddfdd38590e1f5ba578a0aa087181b1 /security
parent217091dd7a7a1bdac027ddb7c5a25f6ac0b8e241 (diff)
downloadlinux-398ce073700a2a3e86b5a0b1edecdddfa3996b27.tar.gz
smack: fix: allow either entry be missing on access/access2 check (v2)
This is a regression caused by f7112e6c. When either subject or object is not found the answer for access should be no. This patch fixes the situation. '0' is written back instead of failing with -EINVAL. v2: cosmetic style fixes Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'security')
-rw-r--r--security/smack/smackfs.c29
1 files changed, 15 insertions, 14 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 160aa08e3cd..1c89ade186b 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -301,7 +301,8 @@ static int smk_perm_from_str(const char *string)
* @import: if non-zero, import labels
* @len: label length limit
*
- * Returns 0 on success, -1 on failure
+ * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject
+ * or object is missing.
*/
static int smk_fill_rule(const char *subject, const char *object,
const char *access1, const char *access2,
@@ -314,28 +315,28 @@ static int smk_fill_rule(const char *subject, const char *object,
if (import) {
rule->smk_subject = smk_import_entry(subject, len);
if (rule->smk_subject == NULL)
- return -1;
+ return -EINVAL;
rule->smk_object = smk_import(object, len);
if (rule->smk_object == NULL)
- return -1;
+ return -EINVAL;
} else {
cp = smk_parse_smack(subject, len);
if (cp == NULL)
- return -1;
+ return -EINVAL;
skp = smk_find_entry(cp);
kfree(cp);
if (skp == NULL)
- return -1;
+ return -ENOENT;
rule->smk_subject = skp;
cp = smk_parse_smack(object, len);
if (cp == NULL)
- return -1;
+ return -EINVAL;
skp = smk_find_entry(cp);
kfree(cp);
if (skp == NULL)
- return -1;
+ return -ENOENT;
rule->smk_object = skp->smk_known;
}
@@ -381,6 +382,7 @@ static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
{
ssize_t cnt = 0;
char *tok[4];
+ int rc;
int i;
/*
@@ -405,10 +407,8 @@ static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
while (i < 4)
tok[i++] = NULL;
- if (smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0))
- return -1;
-
- return cnt;
+ rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
+ return rc == 0 ? cnt : rc;
}
#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
@@ -1856,11 +1856,12 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
res = smk_parse_long_rule(data, &rule, 0, 3);
}
- if (res < 0)
+ if (res >= 0)
+ res = smk_access(rule.smk_subject, rule.smk_object,
+ rule.smk_access1, NULL);
+ else if (res != -ENOENT)
return -EINVAL;
- res = smk_access(rule.smk_subject, rule.smk_object,
- rule.smk_access1, NULL);
data[0] = res == 0 ? '1' : '0';
data[1] = '\0';