ima: add support for measuring and appraising firmware

The "security: introduce kernel_fw_from_file hook" patch defined a
new security hook to evaluate any loaded firmware that wasn't built
into the kernel.

This patch defines ima_fw_from_file(), which is called from the new
security hook, to measure and/or appraise the loaded firmware's
integrity.

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Kees Cook <keescook@chromium.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/security/security.c b/security/security.c
index 35d37d0..e41b1a8 100644
--- a/security/security.c
+++ b/security/security.c
@@ -847,7 +847,12 @@ int security_kernel_create_files_as(struct cred *new, struct inode *inode)
 
 int security_kernel_fw_from_file(struct file *file, char *buf, size_t size)
 {
-	return security_ops->kernel_fw_from_file(file, buf, size);
+	int ret;
+
+	ret = security_ops->kernel_fw_from_file(file, buf, size);
+	if (ret)
+		return ret;
+	return ima_fw_from_file(file, buf, size);
 }
 EXPORT_SYMBOL_GPL(security_kernel_fw_from_file);