linux-kernel - [PATCH 1/1] integrity: prevent loading untrusted certificates to IMA trusted keyring

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Message-Id: <fbc77b7587d515f17a8a7290daacd251064acbcb.1441911975.git.dmitry.kasatkin@huawei.com>
Date:	Thu, 10 Sep 2015 22:06:15 +0300
From:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
To:	zohar@...ux.vnet.ibm.com, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Dmitry Kasatkin <dmitry.kasatkin@...wei.com>,
	<stable@...r.kernel.org>
Subject: [PATCH 1/1] integrity: prevent loading untrusted certificates to IMA trusted keyring

If IMA_LOAD_X509 is enabled either directly or indirectly via
IMA_APPRAISE_SIGNED_INIT, it enables certificate loading to the IMA trusted
keyring from the kernel. Due to the overlook, KEY_ALLOC_TRUSTED was used in the
key_create_or_update() to create keys within the kernel, which caused
overriding certificate verification result and allowed to load self-signed or
wrongly signed certificates.

This patch just removes this option.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@...wei.com>
Cc:  <stable@...r.kernel.org> # 3.19+
---
 security/integrity/digsig.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index 36fb6b5..5be9ffb 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -105,7 +105,7 @@ int __init integrity_load_x509(const unsigned int id, const char *path)
 				   rc,
 				   ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
 				    KEY_USR_VIEW | KEY_USR_READ),
-				   KEY_ALLOC_NOT_IN_QUOTA | KEY_ALLOC_TRUSTED);
+				   KEY_ALLOC_NOT_IN_QUOTA);
 	if (IS_ERR(key)) {
 		rc = PTR_ERR(key);
 		pr_err("Problem loading X.509 certificate (%d): %s\n",
-- 
2.1.4

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