v4.19.13 snapshot.
diff --git a/security/integrity/iint.c b/security/integrity/iint.c
new file mode 100644
index 0000000..5a68100
--- /dev/null
+++ b/security/integrity/iint.c
@@ -0,0 +1,234 @@
+/*
+ * Copyright (C) 2008 IBM Corporation
+ *
+ * Authors:
+ * Mimi Zohar <zohar@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ * File: integrity_iint.c
+ * - implements the integrity hooks: integrity_inode_alloc,
+ * integrity_inode_free
+ * - cache integrity information associated with an inode
+ * using a rbtree tree.
+ */
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/rbtree.h>
+#include <linux/file.h>
+#include <linux/uaccess.h>
+#include <linux/security.h>
+#include "integrity.h"
+
+static struct rb_root integrity_iint_tree = RB_ROOT;
+static DEFINE_RWLOCK(integrity_iint_lock);
+static struct kmem_cache *iint_cache __read_mostly;
+
+struct dentry *integrity_dir;
+
+/*
+ * __integrity_iint_find - return the iint associated with an inode
+ */
+static struct integrity_iint_cache *__integrity_iint_find(struct inode *inode)
+{
+ struct integrity_iint_cache *iint;
+ struct rb_node *n = integrity_iint_tree.rb_node;
+
+ while (n) {
+ iint = rb_entry(n, struct integrity_iint_cache, rb_node);
+
+ if (inode < iint->inode)
+ n = n->rb_left;
+ else if (inode > iint->inode)
+ n = n->rb_right;
+ else
+ break;
+ }
+ if (!n)
+ return NULL;
+
+ return iint;
+}
+
+/*
+ * integrity_iint_find - return the iint associated with an inode
+ */
+struct integrity_iint_cache *integrity_iint_find(struct inode *inode)
+{
+ struct integrity_iint_cache *iint;
+
+ if (!IS_IMA(inode))
+ return NULL;
+
+ read_lock(&integrity_iint_lock);
+ iint = __integrity_iint_find(inode);
+ read_unlock(&integrity_iint_lock);
+
+ return iint;
+}
+
+static void iint_free(struct integrity_iint_cache *iint)
+{
+ kfree(iint->ima_hash);
+ iint->ima_hash = NULL;
+ iint->version = 0;
+ iint->flags = 0UL;
+ iint->atomic_flags = 0UL;
+ iint->ima_file_status = INTEGRITY_UNKNOWN;
+ iint->ima_mmap_status = INTEGRITY_UNKNOWN;
+ iint->ima_bprm_status = INTEGRITY_UNKNOWN;
+ iint->ima_read_status = INTEGRITY_UNKNOWN;
+ iint->ima_creds_status = INTEGRITY_UNKNOWN;
+ iint->evm_status = INTEGRITY_UNKNOWN;
+ iint->measured_pcrs = 0;
+ kmem_cache_free(iint_cache, iint);
+}
+
+/**
+ * integrity_inode_get - find or allocate an iint associated with an inode
+ * @inode: pointer to the inode
+ * @return: allocated iint
+ *
+ * Caller must lock i_mutex
+ */
+struct integrity_iint_cache *integrity_inode_get(struct inode *inode)
+{
+ struct rb_node **p;
+ struct rb_node *node, *parent = NULL;
+ struct integrity_iint_cache *iint, *test_iint;
+
+ iint = integrity_iint_find(inode);
+ if (iint)
+ return iint;
+
+ iint = kmem_cache_alloc(iint_cache, GFP_NOFS);
+ if (!iint)
+ return NULL;
+
+ write_lock(&integrity_iint_lock);
+
+ p = &integrity_iint_tree.rb_node;
+ while (*p) {
+ parent = *p;
+ test_iint = rb_entry(parent, struct integrity_iint_cache,
+ rb_node);
+ if (inode < test_iint->inode)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+
+ iint->inode = inode;
+ node = &iint->rb_node;
+ inode->i_flags |= S_IMA;
+ rb_link_node(node, parent, p);
+ rb_insert_color(node, &integrity_iint_tree);
+
+ write_unlock(&integrity_iint_lock);
+ return iint;
+}
+
+/**
+ * integrity_inode_free - called on security_inode_free
+ * @inode: pointer to the inode
+ *
+ * Free the integrity information(iint) associated with an inode.
+ */
+void integrity_inode_free(struct inode *inode)
+{
+ struct integrity_iint_cache *iint;
+
+ if (!IS_IMA(inode))
+ return;
+
+ write_lock(&integrity_iint_lock);
+ iint = __integrity_iint_find(inode);
+ rb_erase(&iint->rb_node, &integrity_iint_tree);
+ write_unlock(&integrity_iint_lock);
+
+ iint_free(iint);
+}
+
+static void init_once(void *foo)
+{
+ struct integrity_iint_cache *iint = foo;
+
+ memset(iint, 0, sizeof(*iint));
+ iint->ima_file_status = INTEGRITY_UNKNOWN;
+ iint->ima_mmap_status = INTEGRITY_UNKNOWN;
+ iint->ima_bprm_status = INTEGRITY_UNKNOWN;
+ iint->ima_read_status = INTEGRITY_UNKNOWN;
+ iint->ima_creds_status = INTEGRITY_UNKNOWN;
+ iint->evm_status = INTEGRITY_UNKNOWN;
+ mutex_init(&iint->mutex);
+}
+
+static int __init integrity_iintcache_init(void)
+{
+ iint_cache =
+ kmem_cache_create("iint_cache", sizeof(struct integrity_iint_cache),
+ 0, SLAB_PANIC, init_once);
+ return 0;
+}
+security_initcall(integrity_iintcache_init);
+
+
+/*
+ * integrity_kernel_read - read data from the file
+ *
+ * This is a function for reading file content instead of kernel_read().
+ * It does not perform locking checks to ensure it cannot be blocked.
+ * It does not perform security checks because it is irrelevant for IMA.
+ *
+ */
+int integrity_kernel_read(struct file *file, loff_t offset,
+ void *addr, unsigned long count)
+{
+ mm_segment_t old_fs;
+ char __user *buf = (char __user *)addr;
+ ssize_t ret;
+
+ if (!(file->f_mode & FMODE_READ))
+ return -EBADF;
+
+ old_fs = get_fs();
+ set_fs(get_ds());
+ ret = __vfs_read(file, buf, count, &offset);
+ set_fs(old_fs);
+
+ return ret;
+}
+
+/*
+ * integrity_load_keys - load integrity keys hook
+ *
+ * Hooks is called from init/main.c:kernel_init_freeable()
+ * when rootfs is ready
+ */
+void __init integrity_load_keys(void)
+{
+ ima_load_x509();
+ evm_load_x509();
+}
+
+static int __init integrity_fs_init(void)
+{
+ integrity_dir = securityfs_create_dir("integrity", NULL);
+ if (IS_ERR(integrity_dir)) {
+ int ret = PTR_ERR(integrity_dir);
+
+ if (ret != -ENODEV)
+ pr_err("Unable to create integrity sysfs dir: %d\n",
+ ret);
+ integrity_dir = NULL;
+ return ret;
+ }
+
+ return 0;
+}
+
+late_initcall(integrity_fs_init)