evm: properly handle INTEGRITY_NOXATTRS EVM status

Unless an LSM labels a file during d_instantiate(), newly created
files are not labeled with an initial security.evm xattr, until
the file closes.  EVM, before allowing a protected, security xattr
to be written, verifies the existing 'security.evm' value is good.
For newly created files without a security.evm label, this
verification prevents writing any protected, security xattrs,
until the file closes.

Following is the example when this happens:
fd = open("foo", O_CREAT | O_WRONLY, 0644);
setxattr("foo", "security.SMACK64", value, sizeof(value), 0);
close(fd);

While INTEGRITY_NOXATTRS status is handled in other places, such
as evm_inode_setattr(), it does not handle it in all cases in
evm_protect_xattr().  By limiting the use of INTEGRITY_NOXATTRS to
newly created files, we can now allow setting "protected" xattrs.

Changelog:
- limit the use of INTEGRITY_NOXATTRS to IMA identified new files

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org>  3.14+

diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index 4022012..9685af3 100644 (file)
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -285,6 +285,13 @@ static int evm_protect_xattr(struct dentry *dentry, const char *xattr_name,
                goto out;
        }
        evm_status = evm_verify_current_integrity(dentry);
+       if (evm_status == INTEGRITY_NOXATTRS) {
+               struct integrity_iint_cache *iint;
+
+               iint = integrity_iint_find(dentry->d_inode);
+               if (iint && (iint->flags & IMA_NEW_FILE))
+                       return 0;
+       }
 out:
        if (evm_status != INTEGRITY_PASS)
                integrity_audit_msg(AUDIT_INTEGRITY_METADATA, dentry->d_inode,