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Smack: user access check bounds

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Some of the bounds checking used on the /smack/access
interface was lost when support for long labels was
added. No kernel access checks are affected, however
this is a case where /smack/access could be used
incorrectly and fail to detect the error. This patch
reintroduces the original checks.

Targeted for git://git.gitorious.org/smack-next/kernel.git

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Casey Schaufler 2012-06-18 19:01:36 -07:00
parent 1880eff77e
commit 3518721a89
1 changed files with 12 additions and 14 deletions
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26
security/smack/smackfs.c
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@ -215,28 +215,27 @@ static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
* @access: access string
* @rule: Smack rule
* @import: if non-zero, import labels
* @len: label length limit
*
* Returns 0 on success, -1 on failure
*/
static int smk_fill_rule(const char *subject, const char *object,
const char *access, struct smack_rule *rule,
int import)
int import, int len)
{
int rc = -1;
int done;
const char *cp;
struct smack_known *skp;
if (import) {
rule->smk_subject = smk_import(subject, 0);
rule->smk_subject = smk_import(subject, len);
if (rule->smk_subject == NULL)
return -1;
rule->smk_object = smk_import(object, 0);
rule->smk_object = smk_import(object, len);
if (rule->smk_object == NULL)
return -1;
} else {
cp = smk_parse_smack(subject, 0);
cp = smk_parse_smack(subject, len);
if (cp == NULL)
return -1;
skp = smk_find_entry(cp);
@ -245,7 +244,7 @@ static int smk_fill_rule(const char *subject, const char *object,
return -1;
rule->smk_subject = skp->smk_known;
cp = smk_parse_smack(object, 0);
cp = smk_parse_smack(object, len);
if (cp == NULL)
return -1;
skp = smk_find_entry(cp);
@ -257,7 +256,7 @@ static int smk_fill_rule(const char *subject, const char *object,
rule->smk_access = 0;
for (cp = access, done = 0; *cp && !done; cp++) {
for (cp = access; *cp != '\0'; cp++) {
switch (*cp) {
case '-':
break;
@ -282,13 +281,11 @@ static int smk_fill_rule(const char *subject, const char *object,
rule->smk_access |= MAY_TRANSMUTE;
break;
default:
done = 1;
break;
return 0;
}
}
rc = 0;
return rc;
return 0;
}
/**
@ -304,7 +301,8 @@ static int smk_parse_rule(const char *data, struct smack_rule *rule, int import)
int rc;
rc = smk_fill_rule(data, data + SMK_LABELLEN,
data + SMK_LABELLEN + SMK_LABELLEN, rule, import);
data + SMK_LABELLEN + SMK_LABELLEN, rule, import,
SMK_LABELLEN);
return rc;
}
@ -340,7 +338,7 @@ static int smk_parse_long_rule(const char *data, struct smack_rule *rule,
goto free_out_o;
if (sscanf(data, "%s %s %s", subject, object, access) == 3)
rc = smk_fill_rule(subject, object, access, rule, import);
rc = smk_fill_rule(subject, object, access, rule, import, 0);
kfree(access);
free_out_o: