/* * 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 #include #include #include #include #include #include #include #include #include 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 = kstrndup(buf, count, GFP_KERNEL); if (!name) return -ENOSPC; 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); goto out; } pr_info("loaded: %zu\n", test_firmware->size); rc = count; out: mutex_unlock(&test_fw_mutex); kfree(name); return rc; } static DEVICE_ATTR_WO(trigger_request); static DECLARE_COMPLETION(async_fw_done); static void trigger_async_request_cb(const struct firmware *fw, void *context) { test_firmware = fw; complete(&async_fw_done); } static ssize_t trigger_async_request_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int rc; char *name; name = kstrndup(buf, count, GFP_KERNEL); if (!name) return -ENOSPC; pr_info("loading '%s'\n", name); mutex_lock(&test_fw_mutex); release_firmware(test_firmware); test_firmware = NULL; rc = request_firmware_nowait(THIS_MODULE, 1, name, dev, GFP_KERNEL, NULL, trigger_async_request_cb); if (rc) { pr_info("async load of '%s' failed: %d\n", name, rc); kfree(name); goto out; } /* Free 'name' ASAP, to test for race conditions */ kfree(name); wait_for_completion(&async_fw_done); if (test_firmware) { pr_info("loaded: %zu\n", test_firmware->size); rc = count; } else { pr_err("failed to async load firmware\n"); rc = -ENODEV; } out: mutex_unlock(&test_fw_mutex); return rc; } static DEVICE_ATTR_WO(trigger_async_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; } rc = device_create_file(test_fw_misc_device.this_device, &dev_attr_trigger_async_request); if (rc) { pr_err("could not create async sysfs interface: %d\n", rc); goto remove_file; } pr_warn("interface ready\n"); return 0; remove_file: device_remove_file(test_fw_misc_device.this_device, &dev_attr_trigger_async_request); 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_async_request); 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 "); MODULE_LICENSE("GPL"); b3aa2bcdaf2e075276'>logplain -rw-r--r--drm_agpsupport.h3867logplain -rw-r--r--drm_atomic.h14443logplain -rw-r--r--drm_atomic_helper.h10607logplain -rw-r--r--drm_auth.h2260logplain -rw-r--r--drm_blend.h2700logplain -rw-r--r--drm_bridge.h7977logplain -rw-r--r--drm_cache.h1763logplain -rw-r--r--drm_color_mgmt.h2166logplain -rw-r--r--drm_connector.h28613logplain -rw-r--r--drm_crtc.h28999logplain -rw-r--r--drm_crtc_helper.h3301logplain -rw-r--r--drm_debugfs_crc.h2670logplain -rw-r--r--drm_displayid.h2850logplain -rw-r--r--drm_dp_dual_mode_helper.h4532logplain -rw-r--r--drm_dp_helper.h30638logplain -rw-r--r--drm_dp_mst_helper.h16260logplain -rw-r--r--drm_drv.h14861logplain -rw-r--r--drm_edid.h14335logplain -rw-r--r--drm_encoder.h8160logplain -rw-r--r--drm_encoder_slave.h6583logplain -rw-r--r--drm_fb_cma_helper.h1929logplain -rw-r--r--drm_fb_helper.h15125logplain -rw-r--r--drm_fixed.h4825logplain -rw-r--r--drm_flip_work.h3071logplain -rw-r--r--drm_fourcc.h2748logplain -rw-r--r--drm_framebuffer.h9623logplain -rw-r--r--drm_gem.h8052logplain -rw-r--r--drm_gem_cma_helper.h2286logplain -rw-r--r--drm_global.h2011logplain -rw-r--r--drm_hashtab.h3139logplain -rw-r--r--drm_irq.h6323logplain -rw-r--r--drm_legacy.h6933logplain -rw-r--r--drm_mem_util.h2468logplain -rw-r--r--drm_mipi_dsi.h10327logplain -rw-r--r--drm_mm.h11462logplain -rw-r--r--drm_mode_config.h23728logplain -rw-r--r--drm_mode_object.h4911logplain -rw-r--r--drm_modes.h17078logplain -rw-r--r--drm_modeset_helper.h1576logplain -rw-r--r--drm_modeset_helper_vtables.h41180logplain -rw-r--r--drm_modeset_lock.h4241logplain -rw-r--r--drm_of.h2034logplain -rw-r--r--drm_os_linux.h2230logplain -rw-r--r--drm_panel.h7079logplain -rw-r--r--drm_pciids.h68035logplain -rw-r--r--drm_plane.h19435logplain -rw-r--r--drm_plane_helper.h3186logplain -rw-r--r--drm_print.h3232logplain -rw-r--r--drm_property.h11460logplain -rw-r--r--drm_rect.h5103logplain -rw-r--r--drm_simple_kms_helper.h4090logplain -rw-r--r--drm_sysfs.h300logplain -rw-r--r--drm_vma_manager.h7840logplain -rw-r--r--gma_drm.h1033logplain d---------i2c109logplain