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authorTianjia Zhang <tianjia.zhang@linux.alibaba.com>2021-07-15 17:17:24 +0800
committerCasey Schaufler <casey@schaufler-ca.com>2021-07-20 09:17:36 -0700
commit6d14f5c7028eea70760df284057fe198ce7778dd (patch)
tree46d0550c4a1377d867486aa00653c3b65cbaf800 /security
parentLinux 5.14-rc2 (diff)
downloadwireguard-linux-6d14f5c7028eea70760df284057fe198ce7778dd.tar.xz
wireguard-linux-6d14f5c7028eea70760df284057fe198ce7778dd.zip
Smack: Fix wrong semantics in smk_access_entry()
In the smk_access_entry() function, if no matching rule is found in the rust_list, a negative error code will be used to perform bit operations with the MAY_ enumeration value. This is semantically wrong. This patch fixes this issue. Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security')
-rw-r--r--security/smack/smack_access.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 1f391f6a3d47..d2186e2757be 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -81,23 +81,22 @@ int log_policy = SMACK_AUDIT_DENIED;
int smk_access_entry(char *subject_label, char *object_label,
struct list_head *rule_list)
{
- int may = -ENOENT;
struct smack_rule *srp;
list_for_each_entry_rcu(srp, rule_list, list) {
if (srp->smk_object->smk_known == object_label &&
srp->smk_subject->smk_known == subject_label) {
- may = srp->smk_access;
- break;
+ int may = srp->smk_access;
+ /*
+ * MAY_WRITE implies MAY_LOCK.
+ */
+ if ((may & MAY_WRITE) == MAY_WRITE)
+ may |= MAY_LOCK;
+ return may;
}
}
- /*
- * MAY_WRITE implies MAY_LOCK.
- */
- if ((may & MAY_WRITE) == MAY_WRITE)
- may |= MAY_LOCK;
- return may;
+ return -ENOENT;
}
/**