smack: fix key permission verification

[platform/adaptation/renesas_rcar/renesas_kernel.git] / security / smack / smack_lsm.c

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index eabb97f..c972a71 100644 (file)
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3519,6 +3519,7 @@ static int smack_key_permission(key_ref_t key_ref,
        struct key *keyp;
        struct smk_audit_info ad;
        struct smack_known *tkp = smk_of_task(cred->security);
+       int request = 0;
 
        keyp = key_ref_to_ptr(key_ref);
        if (keyp == NULL)
@@ -3539,7 +3540,11 @@ static int smack_key_permission(key_ref_t key_ref,
        ad.a.u.key_struct.key = keyp->serial;
        ad.a.u.key_struct.key_desc = keyp->description;
 #endif
-       return smk_access(tkp, keyp->security, MAY_READWRITE, &ad);
+       if (perm & KEY_NEED_READ)
+               request = MAY_READ;
+       if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
+               request = MAY_WRITE;
+       return smk_access(tkp, keyp->security, request, &ad);
 }
 #endif /* CONFIG_KEYS */