linux-kernel - [PATCH v3 2/3] ima: limit file hash setting by user to fix and log modes

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Message-id: <cbeced22716ee43c9381539ffe34b4f7ff037247.1414494901.git.d.kasatkin@samsung.com>
Date:	Tue, 28 Oct 2014 13:31:23 +0200
From:	Dmitry Kasatkin <d.kasatkin@...sung.com>
To:	zohar@...ux.vnet.ibm.com, linux-security-module@...r.kernel.org,
	linux-ima-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, jack@...e.cz, jmorris@...ei.org,
	dmitry.kasatkin@...il.com, Dmitry Kasatkin <d.kasatkin@...sung.com>
Subject: [PATCH v3 2/3] ima: limit file hash setting by user to fix and log
 modes

File hashes are automatically set and updated and should not be
manually set. This patch limits file hash setting to fix and log
modes.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com>
---
 security/integrity/ima/ima_appraise.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 7c8f41e..8549787 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -378,10 +378,14 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
 	result = ima_protect_xattr(dentry, xattr_name, xattr_value,
 				   xattr_value_len);
 	if (result == 1) {
+		bool digsig;
+
 		if (!xattr_value_len || (xvalue->type >= IMA_XATTR_LAST))
 			return -EINVAL;
-		ima_reset_appraise_flags(dentry->d_inode,
-			 (xvalue->type == EVM_IMA_XATTR_DIGSIG) ? 1 : 0);
+		digsig = (xvalue->type == EVM_IMA_XATTR_DIGSIG);
+		if (!digsig && (ima_appraise & IMA_APPRAISE_ENFORCE))
+			return -EPERM;
+		ima_reset_appraise_flags(dentry->d_inode, digsig);
 		result = 0;
 	}
 	return result;
-- 
1.9.1

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