[PATCH] firmware: Add signature check to firmware_data_write

[Lee , Chun-Yi]

---
 drivers/base/firmware_class.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 8945f4e..40d8cc6 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -621,6 +621,7 @@ static ssize_t firmware_data_write(struct file
*filp, struct kobject *kobj,
        struct firmware_priv *fw_priv = to_firmware_priv(dev);
        struct firmware_buf *buf;
        ssize_t retval;
+       bool success = false;

        if (!capable(CAP_SYS_RAWIO))
                return -EPERM;
@@ -655,6 +656,23 @@ static ssize_t firmware_data_write(struct file
*filp, struct kobject *kobj,
        }

        buf->size = max_t(size_t, offset, buf->size);
+
+#ifdef CONFIG_FIRMWARE_SIG
+       for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
+               snprintf(path, PATH_MAX, "%s/%s.sig", fw_path[i], buf->fw_id);
+               if (verify_signature(buf, path))
+                       success = true;
+       }
+       if (!success) {
+               pr_err("Invalid signature file %s\n", path);
+               if (sig_enforce) {
+                       vfree(buf->data);
+                       buf->data = NULL;
+                       buf->size = 0;
+               }
+               retval = -ENOENT;
+       }
+#endif /* CONFIG_FIRMWARE_SIG */
 out:
        mutex_unlock(&fw_lock);
        return retval;
-- 
1.6.4.2
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