@@ -14,11 +14,22 @@
#include <linux/vmalloc.h>
#include <crypto/sha.h>
+#include "embedded-firmware.h"
+
+#ifdef CONFIG_TEST_FIRMWARE
+# define EFI_EMBEDDED_FW_VISIBILITY
+#else
+# define EFI_EMBEDDED_FW_VISIBILITY static
+#endif
+
+EFI_EMBEDDED_FW_VISIBILITY LIST_HEAD(efi_embedded_fw_list);
+EFI_EMBEDDED_FW_VISIBILITY bool efi_embedded_fw_checked;
+
/* Exported for use by lib/test_firmware.c only */
-LIST_HEAD(efi_embedded_fw_list);
+#ifdef CONFIG_TEST_FIRMWARE
EXPORT_SYMBOL_GPL(efi_embedded_fw_list);
-
-static bool checked_for_fw;
+EXPORT_SYMBOL_GPL(efi_embedded_fw_checked);
+#endif
static const struct dmi_system_id * const embedded_fw_table[] = {
#ifdef CONFIG_TOUCHSCREEN_DMI
@@ -119,14 +130,14 @@ void __init efi_check_for_embedded_firmwares(void)
}
}
- checked_for_fw = true;
+ efi_embedded_fw_checked = true;
}
int efi_get_embedded_fw(const char *name, const u8 **data, size_t *size)
{
struct efi_embedded_fw *iter, *fw = NULL;
- if (!checked_for_fw) {
+ if (!efi_embedded_fw_checked) {
pr_warn("Warning %s called while we did not check for embedded fw\n",
__func__);
return -ENOENT;
new file mode 100644
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EFI_EMBEDDED_FW_INTERNAL_H_
+#define _EFI_EMBEDDED_FW_INTERNAL_H_
+
+/*
+ * This struct and efi_embedded_fw_list are private to the efi-embedded fw
+ * implementation they only in separate header for use by lib/test_firmware.c.
+ */
+struct efi_embedded_fw {
+ struct list_head list;
+ const char *name;
+ const u8 *data;
+ size_t length;
+};
+
+extern struct list_head efi_embedded_fw_list;
+extern bool efi_embedded_fw_checked;
+
+#endif /* _EFI_EMBEDDED_FW_INTERNAL_H_ */
@@ -7,19 +7,6 @@
#define EFI_EMBEDDED_FW_PREFIX_LEN 8
-/*
- * This struct and efi_embedded_fw_list are private to the efi-embedded fw
- * implementation they are in this header for use by lib/test_firmware.c only!
- */
-struct efi_embedded_fw {
- struct list_head list;
- const char *name;
- const u8 *data;
- size_t length;
-};
-
-extern struct list_head efi_embedded_fw_list;
-
/**
* struct efi_embedded_fw_desc - This struct is used by the EFI embedded-fw
* code to search for embedded firmwares.
@@ -489,6 +489,7 @@ static ssize_t trigger_request_store(struct device *dev,
static DEVICE_ATTR_WO(trigger_request);
#ifdef CONFIG_EFI_EMBEDDED_FIRMWARE
+#include "../drivers/firmware/efi/embedded-firmware.h"
static ssize_t trigger_request_platform_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@@ -501,6 +502,7 @@ static ssize_t trigger_request_platform_store(struct device *dev,
};
struct efi_embedded_fw efi_embedded_fw;
const struct firmware *firmware = NULL;
+ bool saved_efi_embedded_fw_checked;
char *name;
int rc;
@@ -513,6 +515,8 @@ static ssize_t trigger_request_platform_store(struct device *dev,
efi_embedded_fw.data = (void *)test_data;
efi_embedded_fw.length = sizeof(test_data);
list_add(&efi_embedded_fw.list, &efi_embedded_fw_list);
+ saved_efi_embedded_fw_checked = efi_embedded_fw_checked;
+ efi_embedded_fw_checked = true;
pr_info("loading '%s'\n", name);
rc = firmware_request_platform(&firmware, name, dev);
@@ -530,6 +534,7 @@ static ssize_t trigger_request_platform_store(struct device *dev,
rc = count;
out:
+ efi_embedded_fw_checked = saved_efi_embedded_fw_checked;
release_firmware(firmware);
list_del(&efi_embedded_fw.list);
kfree(name);
On non-EFI systems, it wasn't possible to test the platform firmware loader because it will have never set "checked_fw" during __init. Instead, allow the test code to override this check. Additionally split the declarations into a private header file so it there is greater enforcement of the symbol visibility. Fixes: 548193cba2a7 ("test_firmware: add support for firmware_request_platform") Cc: stable@vger.kernel.org Acked-by: Scott Branden <scott.branden@broadcom.com> Signed-off-by: Kees Cook <keescook@chromium.org> --- drivers/firmware/efi/embedded-firmware.c | 21 ++++++++++++++++----- drivers/firmware/efi/embedded-firmware.h | 19 +++++++++++++++++++ include/linux/efi_embedded_fw.h | 13 ------------- lib/test_firmware.c | 5 +++++ 4 files changed, 40 insertions(+), 18 deletions(-) create mode 100644 drivers/firmware/efi/embedded-firmware.h