linux-kernel - [PATCH] smack lsm bug fixes

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Message-ID: <CABPv_jf7Sy26C=LUzFkYyDSFrvtk05Snv-PQJEu2fpm5dhJWrQ@mail.gmail.com>
Date:	Thu, 20 Feb 2014 15:45:56 +0530
From:	Pankaj Kumar <pankaj13lvs3@...il.com>
To:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, casey@...aufler-ca.com
Cc:	pankaj.k2@...sung.com
Subject: [PATCH] smack lsm bug fixes

From: Pankaj Kumar <pankaj.k2@...sung.com>

1. In order to remove any SMACK extended attribute from a file, a user
should have CAP_MAC_ADMIN capability. But any user without this
capability is able to remove SMACK64MMAP security attribute. This error
has been corrected by a modification in smack_inode_removexattr hook.

2. While setting extended attribute in smack_inode_setsecurity hook,
'-EACCES' error is returned if extended attribute size or value is not
correct. This is wrong error rather this is invalid extended attribute
case. Corrected error '-EINVAL' shall be returned.

Signed-off-by: Pankaj Kumar <pankaj.k2@...sung.com>
Signed-off-by: Himanshu Shukla <himanshu.sh@...sung.com>
---
 security/smack/smack_lsm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 14f52be..e1b1650 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -938,7 +938,7 @@ static int smack_inode_removexattr(struct dentry
*dentry, const char *name)
         strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
         strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
         strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
-        strcmp(name, XATTR_NAME_SMACKMMAP)) {
+        strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
         if (!smack_privileged(CAP_MAC_ADMIN))
             rc = -EPERM;
     } else
@@ -2076,7 +2076,7 @@ static int smack_inode_setsecurity(struct inode
*inode, const char *name,
     int rc = 0;

     if (value == NULL || size > SMK_LONGLABEL || size == 0)
-        return -EACCES;
+        return -EINVAL;

     skp = smk_import_entry(value, size);
     if (skp == NULL)
-- 
1.8.1.2
--
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