linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Roberto Sassu <roberto.sassu@huaweicloud.com>
To: mark@fasheh.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com,
	zohar@linux.ibm.com, dmitry.kasatkin@gmail.com,
	paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com,
	stephen.smalley.work@gmail.com, eparis@parisplace.org,
	casey@schaufler-ca.com
Cc: ocfs2-devel@oss.oracle.com, reiserfs-devel@vger.kernel.org,
	linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org, selinux@vger.kernel.org,
	linux-kernel@vger.kernel.org, keescook@chromium.org,
	nicolas.bouchinet@clip-os.org,
	Roberto Sassu <roberto.sassu@huawei.com>
Subject: [PATCH v7 1/6] reiserfs: Switch to security_inode_init_security()
Date: Thu,  1 Dec 2022 11:41:20 +0100	[thread overview]
Message-ID: <20221201104125.919483-2-roberto.sassu@huaweicloud.com> (raw)
In-Reply-To: <20221201104125.919483-1-roberto.sassu@huaweicloud.com>

From: Roberto Sassu <roberto.sassu@huawei.com>

In preparation for removing security_old_inode_init_security(), switch to
security_inode_init_security().

Define the initxattrs callback reiserfs_initxattrs(), to populate the
name/value/len triple in the reiserfs_security_handle() with the first
xattr provided by LSMs. Make a copy of the xattr value, as
security_inode_init_security() frees it.

After the call to security_inode_init_security(), remove the check for
returning -EOPNOTSUPP, as security_inode_init_security() changes it to
zero.

Multiple xattrs are currently not supported, as the
reiserfs_security_handle structure is exported to user space. As a
consequence, even if EVM is invoked, it will not provide an xattr (if it
is not the first to set it, its xattr will be discarded; if it is the
first, it does not have xattrs to calculate the HMAC on).

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
---
 fs/reiserfs/xattr_security.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/fs/reiserfs/xattr_security.c b/fs/reiserfs/xattr_security.c
index 857a65b05726..0ba96757681d 100644
--- a/fs/reiserfs/xattr_security.c
+++ b/fs/reiserfs/xattr_security.c
@@ -39,6 +39,22 @@ static bool security_list(struct dentry *dentry)
 	return !IS_PRIVATE(d_inode(dentry));
 }
 
+static int
+reiserfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		    void *fs_info)
+{
+	struct reiserfs_security_handle *sec = fs_info;
+
+	sec->value = kmemdup(xattr_array->value, xattr_array->value_len,
+			     GFP_KERNEL);
+	if (!sec->value)
+		return -ENOMEM;
+
+	sec->name = xattr_array->name;
+	sec->length = xattr_array->value_len;
+	return 0;
+}
+
 /* Initializes the security context for a new inode and returns the number
  * of blocks needed for the transaction. If successful, reiserfs_security
  * must be released using reiserfs_security_free when the caller is done. */
@@ -56,12 +72,9 @@ int reiserfs_security_init(struct inode *dir, struct inode *inode,
 	if (IS_PRIVATE(dir))
 		return 0;
 
-	error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
-						 &sec->value, &sec->length);
+	error = security_inode_init_security(inode, dir, qstr,
+					     &reiserfs_initxattrs, sec);
 	if (error) {
-		if (error == -EOPNOTSUPP)
-			error = 0;
-
 		sec->name = NULL;
 		sec->value = NULL;
 		sec->length = 0;
-- 
2.25.1


  reply	other threads:[~2022-12-01 10:43 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-01 10:41 [PATCH v7 0/6] evm: Do HMAC of multiple per LSM xattrs for new inodes Roberto Sassu
2022-12-01 10:41 ` Roberto Sassu [this message]
2022-12-01 10:41 ` [PATCH v7 2/6] ocfs2: Switch to security_inode_init_security() Roberto Sassu
2023-01-10  8:55   ` Roberto Sassu
2023-01-12 17:21     ` Paul Moore
2022-12-01 10:41 ` [PATCH v7 3/6] security: Remove security_old_inode_init_security() Roberto Sassu
2022-12-01 10:41 ` [PATCH v7 4/6] security: Allow all LSMs to provide xattrs for inode_init_security hook Roberto Sassu
2022-12-01 10:41 ` [PATCH v7 5/6] evm: Align evm_inode_init_security() definition with LSM infrastructure Roberto Sassu
2022-12-01 10:41 ` [PATCH v7 6/6] evm: Support multiple LSMs providing an xattr Roberto Sassu
2023-01-12 17:15 ` [PATCH v7 0/6] evm: Do HMAC of multiple per LSM xattrs for new inodes Paul Moore
2023-01-13 10:35   ` Roberto Sassu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20221201104125.919483-2-roberto.sassu@huaweicloud.com \
    --to=roberto.sassu@huaweicloud.com \
    --cc=casey@schaufler-ca.com \
    --cc=dmitry.kasatkin@gmail.com \
    --cc=eparis@parisplace.org \
    --cc=jlbec@evilplan.org \
    --cc=jmorris@namei.org \
    --cc=joseph.qi@linux.alibaba.com \
    --cc=keescook@chromium.org \
    --cc=linux-integrity@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-security-module@vger.kernel.org \
    --cc=mark@fasheh.com \
    --cc=nicolas.bouchinet@clip-os.org \
    --cc=ocfs2-devel@oss.oracle.com \
    --cc=paul@paul-moore.com \
    --cc=reiserfs-devel@vger.kernel.org \
    --cc=roberto.sassu@huawei.com \
    --cc=selinux@vger.kernel.org \
    --cc=serge@hallyn.com \
    --cc=stephen.smalley.work@gmail.com \
    --cc=zohar@linux.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).