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Message-ID: <49087E26.2080905@schaufler-ca.com>
Date: Wed, 29 Oct 2008 08:15:50 -0700
From: Casey Schaufler <casey@...aufler-ca.com>
To: linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
CC: Rob MacKinnon <c4blem0nkey@...il.com>,
Andreas Gruenbacher <agruen@...e.de>,
Stephen Smalley <sds@...ho.nsa.gov>, rob.mackinnon@...il.com,
hpa@...or.com, hugh@...itas.com
Subject: [PATCH] smack inode_listsecurity fix
From: Casey Schaufler <casey@...aufler-ca.com>
This patch fixes the problem known by "tmpfs support of xattrs?"
which is in fact the result of a bad implementation of the
inode_listsecurity LSM hook in Smack. Thanks to Stephen Smalley,
who identified the problem and all but coded the fix before I'd
even heard about it.
Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
---
security/smack/smack_lsm.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff -uprN -X linux-2.6/Documentation/dontdiff linux-2.6/security/smack/smack_lsm.c linux-smack/security/smack/smack_lsm.c
--- linux-2.6/security/smack/smack_lsm.c 2008-10-26 17:37:08.000000000 -0700
+++ linux-smack/security/smack/smack_lsm.c 2008-10-26 19:11:23.000000000 -0700
@@ -763,13 +763,11 @@ static int smack_inode_getsecurity(const
static int smack_inode_listsecurity(struct inode *inode, char *buffer,
size_t buffer_size)
{
- int len = strlen(XATTR_NAME_SMACK);
+ int len = sizeof(XATTR_NAME_SMACK);
- if (buffer != NULL && len <= buffer_size) {
+ if (buffer != NULL && len <= buffer_size)
memcpy(buffer, XATTR_NAME_SMACK, len);
- return len;
- }
- return -EINVAL;
+ return len;
}
/**
--
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