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-rw-r--r--security/integrity/iint.c197
-rw-r--r--security/integrity/integrity.h25
-rw-r--r--security/security.c2
3 files changed, 2 insertions, 222 deletions
diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index d4419a2a1e24..068ac6c2ae1e 100644
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c
@@ -6,208 +6,15 @@
* Mimi Zohar <zohar@us.ibm.com>
*
* 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.
+ * - initialize the integrity directory in securityfs
+ * - load IMA and EVM keys
*/
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/rbtree.h>
-#include <linux/file.h>
-#include <linux/uaccess.h>
#include <linux/security.h>
-#include <linux/lsm_hooks.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 __ro_after_init;
-
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
- return iint;
- }
-
- return NULL;
-}
-
-/*
- * 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;
-}
-
-#define IMA_MAX_NESTING (FILESYSTEM_MAX_STACK_DEPTH+1)
-
-/*
- * It is not clear that IMA should be nested at all, but as long is it measures
- * files both on overlayfs and on underlying fs, we need to annotate the iint
- * mutex to avoid lockdep false positives related to IMA + overlayfs.
- * See ovl_lockdep_annotate_inode_mutex_key() for more details.
- */
-static inline void iint_lockdep_annotate(struct integrity_iint_cache *iint,
- struct inode *inode)
-{
-#ifdef CONFIG_LOCKDEP
- static struct lock_class_key iint_mutex_key[IMA_MAX_NESTING];
-
- int depth = inode->i_sb->s_stack_depth;
-
- if (WARN_ON_ONCE(depth < 0 || depth >= IMA_MAX_NESTING))
- depth = 0;
-
- lockdep_set_class(&iint->mutex, &iint_mutex_key[depth]);
-#endif
-}
-
-static void iint_init_always(struct integrity_iint_cache *iint,
- struct inode *inode)
-{
- 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;
- mutex_init(&iint->mutex);
- iint_lockdep_annotate(iint, inode);
-}
-
-static void iint_free(struct integrity_iint_cache *iint)
-{
- kfree(iint->ima_hash);
- mutex_destroy(&iint->mutex);
- 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;
-
- iint_init_always(iint, inode);
-
- 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 if (inode > test_iint->inode) {
- p = &(*p)->rb_right;
- } else {
- write_unlock(&integrity_iint_lock);
- kmem_cache_free(iint_cache, iint);
- return test_iint;
- }
- }
-
- 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 iint_init_once(void *foo)
-{
- struct integrity_iint_cache *iint = (struct integrity_iint_cache *) foo;
-
- memset(iint, 0, sizeof(*iint));
-}
-
-static int __init integrity_iintcache_init(void)
-{
- iint_cache =
- kmem_cache_create("iint_cache", sizeof(struct integrity_iint_cache),
- 0, SLAB_PANIC, iint_init_once);
- return 0;
-}
-DEFINE_LSM(integrity) = {
- .name = "integrity",
- .init = integrity_iintcache_init,
- .order = LSM_ORDER_LAST,
-};
-
-
-/*
* integrity_kernel_read - read data from the file
*
* This is a function for reading file content instead of kernel_read().
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 671fc50255f9..50d6f798e613 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -102,31 +102,6 @@ struct ima_file_id {
__u8 hash[HASH_MAX_DIGESTSIZE];
} __packed;
-/* integrity data associated with an inode */
-struct integrity_iint_cache {
- struct rb_node rb_node; /* rooted in integrity_iint_tree */
- struct mutex mutex; /* protects: version, flags, digest */
- struct inode *inode; /* back pointer to inode in question */
- u64 version; /* track inode changes */
- unsigned long flags;
- unsigned long measured_pcrs;
- unsigned long atomic_flags;
- unsigned long real_ino;
- dev_t real_dev;
- enum integrity_status ima_file_status:4;
- enum integrity_status ima_mmap_status:4;
- enum integrity_status ima_bprm_status:4;
- enum integrity_status ima_read_status:4;
- enum integrity_status ima_creds_status:4;
- enum integrity_status evm_status:4;
- struct ima_digest_data *ima_hash;
-};
-
-/* rbtree tree calls to lookup, insert, delete
- * integrity data associated with an inode.
- */
-struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
-
int integrity_kernel_read(struct file *file, loff_t offset,
void *addr, unsigned long count);
diff --git a/security/security.c b/security/security.c
index e08c1aa82edf..cbdc9bebe802 100644
--- a/security/security.c
+++ b/security/security.c
@@ -19,7 +19,6 @@
#include <linux/kernel.h>
#include <linux/kernel_read_file.h>
#include <linux/lsm_hooks.h>
-#include <linux/integrity.h>
#include <linux/fsnotify.h>
#include <linux/mman.h>
#include <linux/mount.h>
@@ -1597,7 +1596,6 @@ static void inode_free_by_rcu(struct rcu_head *head)
*/
void security_inode_free(struct inode *inode)
{
- integrity_inode_free(inode);
call_void_hook(inode_free_security, inode);
/*
* The inode may still be referenced in a path walk and
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-17 10:56:58 +0000