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@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index f9d398bc9dcd4b025ec9577f4b65a19170e6abd1..e15e56081c0c8c78252c54fc661398ebdcc6640d 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2848,6 +2848,27 @@ 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,
@@ -6098,6 +6119,7 @@ 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),