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Diffstat (limited to 'security/integrity/iint.c')
-rw-r--r--security/integrity/iint.c48
1 files changed, 37 insertions, 11 deletions
diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index a462df827de2..27ea19fb1f54 100644
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c
@@ -66,9 +66,32 @@ struct integrity_iint_cache *integrity_iint_find(struct inode *inode)
return iint;
}
-static void iint_free(struct integrity_iint_cache *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)
{
- kfree(iint->ima_hash);
iint->ima_hash = NULL;
iint->version = 0;
iint->flags = 0UL;
@@ -80,6 +103,14 @@ static void iint_free(struct integrity_iint_cache *iint)
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);
}
@@ -104,6 +135,8 @@ struct integrity_iint_cache *integrity_inode_get(struct inode *inode)
if (!iint)
return NULL;
+ iint_init_always(iint, inode);
+
write_lock(&integrity_iint_lock);
p = &integrity_iint_tree.rb_node;
@@ -153,25 +186,18 @@ void integrity_inode_free(struct inode *inode)
iint_free(iint);
}
-static void init_once(void *foo)
+static void iint_init_once(void *foo)
{
struct integrity_iint_cache *iint = (struct integrity_iint_cache *) 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);
+ 0, SLAB_PANIC, iint_init_once);
return 0;
}
DEFINE_LSM(integrity) = {