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-rw-r--r--lib/Kconfig.debug13
-rw-r--r--lib/Makefile1
-rw-r--r--lib/test_firmware.c117
3 files changed, 131 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7a638aa3545..213cd9f7e95 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1649,6 +1649,19 @@ config TEST_BPF
If unsure, say N.
+config TEST_FIRMWARE
+ tristate "Test firmware loading via userspace interface"
+ default n
+ depends on FW_LOADER
+ help
+ This builds the "test_firmware" module that creates a userspace
+ interface for testing firmware loading. This can be used to
+ control the triggering of firmware loading without needing an
+ actual firmware-using device. The contents can be rechecked by
+ userspace.
+
+ If unsure, say N.
+
source "samples/Kconfig"
source "lib/Kconfig.kgdb"
diff --git a/lib/Makefile b/lib/Makefile
index ba967a19edb..230b4b1456d 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
obj-$(CONFIG_TEST_MODULE) += test_module.o
obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
obj-$(CONFIG_TEST_BPF) += test_bpf.o
+obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG
diff --git a/lib/test_firmware.c b/lib/test_firmware.c
new file mode 100644
index 00000000000..86374c1c49a
--- /dev/null
+++ b/lib/test_firmware.c
@@ -0,0 +1,117 @@
+/*
+ * This module provides an interface to trigger and test firmware loading.
+ *
+ * It is designed to be used for basic evaluation of the firmware loading
+ * subsystem (for example when validating firmware verification). It lacks
+ * any extra dependencies, and will not normally be loaded by the system
+ * unless explicitly requested by name.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/firmware.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+static DEFINE_MUTEX(test_fw_mutex);
+static const struct firmware *test_firmware;
+
+static ssize_t test_fw_misc_read(struct file *f, char __user *buf,
+ size_t size, loff_t *offset)
+{
+ ssize_t rc = 0;
+
+ mutex_lock(&test_fw_mutex);
+ if (test_firmware)
+ rc = simple_read_from_buffer(buf, size, offset,
+ test_firmware->data,
+ test_firmware->size);
+ mutex_unlock(&test_fw_mutex);
+ return rc;
+}
+
+static const struct file_operations test_fw_fops = {
+ .owner = THIS_MODULE,
+ .read = test_fw_misc_read,
+};
+
+static struct miscdevice test_fw_misc_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "test_firmware",
+ .fops = &test_fw_fops,
+};
+
+static ssize_t trigger_request_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int rc;
+ char *name;
+
+ name = kzalloc(count + 1, GFP_KERNEL);
+ if (!name)
+ return -ENOSPC;
+ memcpy(name, buf, count);
+
+ pr_info("loading '%s'\n", name);
+
+ mutex_lock(&test_fw_mutex);
+ release_firmware(test_firmware);
+ test_firmware = NULL;
+ rc = request_firmware(&test_firmware, name, dev);
+ if (rc)
+ pr_info("load of '%s' failed: %d\n", name, rc);
+ pr_info("loaded: %zu\n", test_firmware ? test_firmware->size : 0);
+ mutex_unlock(&test_fw_mutex);
+
+ kfree(name);
+
+ return count;
+}
+static DEVICE_ATTR_WO(trigger_request);
+
+static int __init test_firmware_init(void)
+{
+ int rc;
+
+ rc = misc_register(&test_fw_misc_device);
+ if (rc) {
+ pr_err("could not register misc device: %d\n", rc);
+ return rc;
+ }
+ rc = device_create_file(test_fw_misc_device.this_device,
+ &dev_attr_trigger_request);
+ if (rc) {
+ pr_err("could not create sysfs interface: %d\n", rc);
+ goto dereg;
+ }
+
+ pr_warn("interface ready\n");
+
+ return 0;
+dereg:
+ misc_deregister(&test_fw_misc_device);
+ return rc;
+}
+
+module_init(test_firmware_init);
+
+static void __exit test_firmware_exit(void)
+{
+ release_firmware(test_firmware);
+ device_remove_file(test_fw_misc_device.this_device,
+ &dev_attr_trigger_request);
+ misc_deregister(&test_fw_misc_device);
+ pr_warn("removed interface\n");
+}
+
+module_exit(test_firmware_exit);
+
+MODULE_AUTHOR("Kees Cook <keescook@chromium.org>");
+MODULE_LICENSE("GPL");