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From: Casey Schaufler <casey@schaufler-ca.com>
To: casey.schaufler@intel.com, jmorris@namei.org,
	linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: casey@schaufler-ca.com, keescook@chromium.org,
	john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp,
	paul@paul-moore.com, sds@tycho.nsa.gov
Subject: [PATCH v7 04/16] LSM: List multiple security attributes in security_inode_listsecurity
Date: Wed,  7 Aug 2019 15:42:33 -0700
Message-ID: <20190807224245.10798-6-casey@schaufler-ca.com> (raw)
In-Reply-To: <20190807224245.10798-1-casey@schaufler-ca.com>

Listing security extended attributes is extended to the case
where there is more than one security module that provides them.
The same format used in other xattr list providers:
	name1\0name2\0name3
is used.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 security/security.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/security/security.c b/security/security.c
index a58e60970035..87cb3562646b 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1475,9 +1475,34 @@ int security_inode_setsecurity(struct inode *inode, const char *name, const void
 
 int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
 {
+	struct security_hook_list *hp;
+	bool first = true;
+	int finallen = 0;
+	int len;
+
 	if (unlikely(IS_PRIVATE(inode)))
 		return 0;
-	return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size);
+
+	hlist_for_each_entry(hp, &security_hook_heads.inode_listsecurity,
+			     list) {
+		len = hp->hook.inode_listsecurity(inode, buffer, buffer_size);
+		if (len < buffer_size) {
+			if (buffer)
+				buffer[len] = '\0';
+			buffer_size -= len + 1;
+		} else {
+			buffer = NULL;
+			buffer_size = 0;
+		}
+		if (first) {
+			finallen = len;
+			first = false;
+		} else
+			finallen += len + 1;
+		if (buffer)
+			buffer += len + 1;
+	}
+	return finallen;
 }
 EXPORT_SYMBOL(security_inode_listsecurity);
 
-- 
2.20.1


  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-07 22:42 [PATCH v7 00/16] LSM: Full module stacking Casey Schaufler
2019-08-07 22:42 ` Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 01/16] LSM: Single hook called in secmark refcounting Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 02/16] Smack: Detect if secmarks can be safely used Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 03/16] LSM: Support multiple LSMs using inode_init_security Casey Schaufler
2019-08-07 22:42 ` Casey Schaufler [this message]
2019-08-07 22:42 ` [PATCH v7 05/16] LSM: Multiple modules using security_ismaclabel Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 06/16] LSM: Make multiple MAC modules safe in nfs and kernfs Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 07/16] LSM: Correct handling of ENOSYS in inode_setxattr Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 08/16] LSM: Infrastructure security blobs for mount options Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 09/16] LSM: Fix for security_init_inode_security Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 10/16] LSM: Change error detection for UDP peer security Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 11/16] Netlabel: Add a secattr comparison API function Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 12/16] Netlabel: Provide labeling type to security modules Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 13/16] LSM: Remember the NLTYPE of netlabel sockets Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 14/16] LSM: Hook for netlabel reconciliation Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 15/16] LSM: Avoid network conflicts in SELinux and Smack Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 16/16] Smack: Remove the exclusive flag Casey Schaufler

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