linux-kernel - [PATCH 7/9] selinux: Implement dentry_create_files

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Date:	Wed, 13 Jul 2016 10:44:53 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	miklos@...redi.hu, sds@...ho.nsa.gov, pmoore@...hat.com,
	casey@...aufler-ca.com, linux-kernel@...r.kernel.org,
	linux-unionfs@...r.kernel.org,
	linux-security-module@...r.kernel.org
Cc:	dwalsh@...hat.com, dhowells@...hat.com, viro@...IV.linux.org.uk,
	vgoyal@...hat.com, linux-fsdevel@...r.kernel.org
Subject: [PATCH 7/9] selinux: Implement dentry_create_files_as() hook

Calculate what would be the label of newly created file and set that secid
in the passed creds.

Context of the task which is actually creating file is retrieved from
set of creds passed in. (old->security).

Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
---
 security/selinux/hooks.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ae11fd9..77eb5a8 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2825,6 +2825,27 @@ static int selinux_dentry_init_security(struct dentry *dentry, int mode,
 	return security_sid_to_context(newsid, (char **)ctx, ctxlen);
 }
 
+static int selinux_dentry_create_files_as(struct dentry *dentry, int mode,
+					  struct qstr *name,
+					  const struct cred *old,
+					  struct cred *new)
+{
+	u32 newsid;
+	int rc;
+	struct task_security_struct *tsec;
+
+	rc = selinux_determine_inode_label(old->security,
+					   d_inode(dentry->d_parent), name,
+					   inode_mode_to_security_class(mode),
+					   &newsid);
+	if (rc)
+		return rc;
+
+	tsec = new->security;
+	tsec->create_sid = newsid;
+	return 0;
+}
+
 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
 				       const struct qstr *qstr,
 				       const char **name,
@@ -6066,6 +6087,7 @@ static struct security_hook_list selinux_hooks[] = {
 	LSM_HOOK_INIT(sb_parse_opts_str, selinux_parse_opts_str),
 
 	LSM_HOOK_INIT(dentry_init_security, selinux_dentry_init_security),
+	LSM_HOOK_INIT(dentry_create_files_as, selinux_dentry_create_files_as),
 
 	LSM_HOOK_INIT(inode_alloc_security, selinux_inode_alloc_security),
 	LSM_HOOK_INIT(inode_free_security, selinux_inode_free_security),
-- 
2.7.4