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From: Roberto Sassu <roberto.sassu@huawei.com>
To: <zohar@linux.ibm.com>, <dmitry.kasatkin@huawei.com>, <mjg59@google.com>
Cc: <linux-integrity@vger.kernel.org>, <linux-doc@vger.kernel.org>,
	<linux-security-module@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <silviu.vlasceanu@huawei.com>,
	Roberto Sassu <roberto.sassu@huawei.com>,
	<stable@vger.kernel.org>
Subject: [PATCH 1/4] evm: check hash algorithm passed to init_desc()
Date: Thu, 16 May 2019 18:12:54 +0200
Message-ID: <20190516161257.6640-1-roberto.sassu@huawei.com> (raw)

This patch prevents memory access beyond the evm_tfm array by checking the
validity of the index (hash algorithm) passed to init_desc(). The hash
algorithm can be arbitrarily set if the security.ima xattr type is not
EVM_XATTR_HMAC.

Fixes: 5feeb61183dde ("evm: Allow non-SHA1 digital signatures")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Cc: stable@vger.kernel.org
---
 security/integrity/evm/evm_crypto.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index e11564eb645b..82a38e801ee4 100644
--- a/security/integrity/evm/evm_crypto.c
+++ b/security/integrity/evm/evm_crypto.c
@@ -89,6 +89,9 @@ static struct shash_desc *init_desc(char type, uint8_t hash_algo)
 		tfm = &hmac_tfm;
 		algo = evm_hmac;
 	} else {
+		if (hash_algo >= HASH_ALGO__LAST)
+			return ERR_PTR(-EINVAL);
+
 		tfm = &evm_tfm[hash_algo];
 		algo = hash_algo_name[hash_algo];
 	}
-- 
2.17.1


             reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-16 16:12 Roberto Sassu [this message]
2019-05-16 16:12 ` [PATCH 2/4] evm: reset status in evm_inode_post_setattr() Roberto Sassu
2019-05-20 21:19   ` Mimi Zohar
2019-05-16 16:12 ` [PATCH 3/4] ima: don't ignore INTEGRITY_UNKNOWN EVM status Roberto Sassu
     [not found]   ` <20190517001001.9BEF620848@mail.kernel.org>
2019-05-17  0:30     ` Mimi Zohar
2019-05-17  1:07       ` Sasha Levin
2019-05-20 21:20   ` Mimi Zohar
2019-05-21  7:26     ` Roberto Sassu
2019-05-21 11:48       ` Mimi Zohar
2019-05-16 16:12 ` [PATCH 4/4] ima: only audit failed appraisal verifications Roberto Sassu
2019-05-20 21:20   ` Mimi Zohar
2019-05-21  7:32     ` Roberto Sassu
2019-05-20 21:19 ` [PATCH 1/4] evm: check hash algorithm passed to init_desc() Mimi Zohar

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