diff --git a/drivers/base/firmware_loader/Kconfig b/drivers/base/firmware_loader/Kconfig index 5166b323a0f87..0cabc783d67af 100644 --- a/drivers/base/firmware_loader/Kconfig +++ b/drivers/base/firmware_loader/Kconfig @@ -24,6 +24,18 @@ config FW_LOADER You also want to be sure to enable this built-in if you are going to enable built-in firmware (CONFIG_EXTRA_FIRMWARE). +config FW_LOADER_DEBUG + bool "Log filenames and checksums for loaded firmware" + depends on DYNAMIC_DEBUG + depends on FW_LOADER + depends on CRYPTO + depends on CRYPTO_SHA256 + default FW_LOADER + help + Select this option to use dynamic debug to log firmware filenames and + SHA256 checksums to the kernel log for each firmware file that is + loaded. + if FW_LOADER config FW_LOADER_PAGED_BUF diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c index 017c4cdb219eb..b2c292ca95e8f 100644 --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -791,6 +791,50 @@ static void fw_abort_batch_reqs(struct firmware *fw) mutex_unlock(&fw_lock); } +#if defined(CONFIG_FW_LOADER_DEBUG) +#include +#include + +static void fw_log_firmware_info(const struct firmware *fw, const char *name, struct device *device) +{ + struct shash_desc *shash; + struct crypto_shash *alg; + u8 *sha256buf; + char *outbuf; + + alg = crypto_alloc_shash("sha256", 0, 0); + if (!alg) + return; + + sha256buf = kmalloc(SHA256_DIGEST_SIZE, GFP_KERNEL); + outbuf = kmalloc(SHA256_BLOCK_SIZE + 1, GFP_KERNEL); + shash = kmalloc(sizeof(*shash) + crypto_shash_descsize(alg), GFP_KERNEL); + if (!sha256buf || !outbuf || !shash) + goto out_free; + + shash->tfm = alg; + + if (crypto_shash_digest(shash, fw->data, fw->size, sha256buf) < 0) + goto out_shash; + + for (int i = 0; i < SHA256_DIGEST_SIZE; i++) + sprintf(&outbuf[i * 2], "%02x", sha256buf[i]); + outbuf[SHA256_BLOCK_SIZE] = 0; + dev_dbg(device, "Loaded FW: %s, sha256: %s\n", name, outbuf); + +out_shash: + crypto_free_shash(alg); +out_free: + kfree(shash); + kfree(outbuf); + kfree(sha256buf); +} +#else +static void fw_log_firmware_info(const struct firmware *fw, const char *name, + struct device *device) +{} +#endif + /* called from request_firmware() and request_firmware_work_func() */ static int _request_firmware(const struct firmware **firmware_p, const char *name, @@ -861,11 +905,13 @@ _request_firmware(const struct firmware **firmware_p, const char *name, revert_creds(old_cred); put_cred(kern_cred); - out: +out: if (ret < 0) { fw_abort_batch_reqs(fw); release_firmware(fw); fw = NULL; + } else { + fw_log_firmware_info(fw, name, device); } *firmware_p = fw;