On 1/9/19 4:10 AM, Ondrej Mosnacek wrote:
The hook applies the same logic as selinux_determine_inode_label(), with
the exception of the super_block handling, which will be enforced on the
actual inodes by other hooks.
Signed-off-by: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Reviewed-by: Stephen Smalley <sds@xxxxxxxxxxxxx>
---
security/selinux/hooks.c | 41 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 7ce012d9ec51..29c038513504 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3526,6 +3526,45 @@ static int selinux_inode_copy_up_xattr(const char *name)
return -EOPNOTSUPP;
}
+/* file-like object operations */
+
+/* Used e.g. for kernfs_node for newly created nodes */
+static int selinux_object_init_security(void *parent_ctx, u32 parent_ctxlen,
+ const struct qstr *qstr, u16 mode,
+ void **ctx, u32 *ctxlen)
+{
+ const struct task_security_struct *tsec = current_security();
+ u32 parent_sid, newsid, clen;
+ int rc;
+ char *context;
+
+ rc = security_context_to_sid(&selinux_state, parent_ctx, parent_ctxlen,
+ &parent_sid, GFP_KERNEL);
+ if (rc)
+ return rc;
+
+ if (tsec->create_sid) {
+ newsid = tsec->create_sid;
+ } else {
+ u16 secclass = inode_mode_to_security_class(mode);
+
+ rc = security_transition_sid(&selinux_state, tsec->sid,
+ parent_sid, secclass, qstr,
+ &newsid);
+ if (rc)
+ return rc;
+ }
+
+ rc = security_sid_to_context_force(&selinux_state, newsid,
+ &context, &clen);
+ if (rc)
+ return rc;
+
+ *ctx = context;
+ *ctxlen = clen;
+ return 0;
+}
+
/* file security operations */
static int selinux_revalidate_file_permission(struct file *file, int mask)
@@ -6965,6 +7004,8 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(inode_copy_up, selinux_inode_copy_up),
LSM_HOOK_INIT(inode_copy_up_xattr, selinux_inode_copy_up_xattr),
+ LSM_HOOK_INIT(object_init_security, selinux_object_init_security),
+
LSM_HOOK_INIT(file_permission, selinux_file_permission),
LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security),
LSM_HOOK_INIT(file_free_security, selinux_file_free_security),
