1 files changed, 33 insertions, 496 deletions

diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c
index b5c865fe263b..3ef0b312ae71 100644
--- a/drivers/base/firmware_loader/fallback.c
+++ b/drivers/base/firmware_loader/fallback.c
@@ -3,12 +3,10 @@
 #include <linux/types.h>
 #include <linux/kconfig.h>
 #include <linux/list.h>
-#include <linux/slab.h>
 #include <linux/security.h>
-#include <linux/highmem.h>
 #include <linux/umh.h>
 #include <linux/sysctl.h>
-#include <linux/vmalloc.h>
+#include <linux/module.h>
 
 #include "fallback.h"
 #include "firmware.h"
@@ -17,20 +15,6 @@
  * firmware fallback mechanism
  */
 
-extern struct firmware_fallback_config fw_fallback_config;
-
-/* These getters are vetted to use int properly */
-static inline int __firmware_loading_timeout(void)
-{
-	return fw_fallback_config.loading_timeout;
-}
-
-/* These setters are vetted to use int properly */
-static void __fw_fallback_set_timeout(int timeout)
-{
-	fw_fallback_config.loading_timeout = timeout;
-}
-
 /*
  * use small loading timeout for caching devices' firmware because all these
  * firmware images have been loaded successfully at lease once, also system is
@@ -55,56 +39,14 @@ static long firmware_loading_timeout(void)
 		__firmware_loading_timeout() * HZ : MAX_JIFFY_OFFSET;
 }
 
-static inline bool fw_sysfs_done(struct fw_priv *fw_priv)
-{
-	return __fw_state_check(fw_priv, FW_STATUS_DONE);
-}
-
-static inline bool fw_sysfs_loading(struct fw_priv *fw_priv)
-{
-	return __fw_state_check(fw_priv, FW_STATUS_LOADING);
-}
-
 static inline int fw_sysfs_wait_timeout(struct fw_priv *fw_priv,  long timeout)
 {
 	return __fw_state_wait_common(fw_priv, timeout);
 }
 
-struct fw_sysfs {
-	bool nowait;
-	struct device dev;
-	struct fw_priv *fw_priv;
-	struct firmware *fw;
-};
-
-static struct fw_sysfs *to_fw_sysfs(struct device *dev)
-{
-	return container_of(dev, struct fw_sysfs, dev);
-}
-
-static void __fw_load_abort(struct fw_priv *fw_priv)
-{
-	/*
-	 * There is a small window in which user can write to 'loading'
-	 * between loading done and disappearance of 'loading'
-	 */
-	if (fw_sysfs_done(fw_priv))
-		return;
-
-	list_del_init(&fw_priv->pending_list);
-	fw_state_aborted(fw_priv);
-}
-
-static void fw_load_abort(struct fw_sysfs *fw_sysfs)
-{
-	struct fw_priv *fw_priv = fw_sysfs->fw_priv;
-
-	__fw_load_abort(fw_priv);
-}
-
 static LIST_HEAD(pending_fw_head);
 
-void kill_pending_fw_fallback_reqs(bool only_kill_custom)
+void kill_pending_fw_fallback_reqs(bool kill_all)
 {
 	struct fw_priv *fw_priv;
 	struct fw_priv *next;
@@ -112,435 +54,24 @@ void kill_pending_fw_fallback_reqs(bool only_kill_custom)
 	mutex_lock(&fw_lock);
 	list_for_each_entry_safe(fw_priv, next, &pending_fw_head,
 				 pending_list) {
-		if (!fw_priv->need_uevent || !only_kill_custom)
+		if (kill_all || !fw_priv->need_uevent)
 			 __fw_load_abort(fw_priv);
 	}
-	mutex_unlock(&fw_lock);
-}
-
-static ssize_t timeout_show(struct class *class, struct class_attribute *attr,
-			    char *buf)
-{
-	return sprintf(buf, "%d\n", __firmware_loading_timeout());
-}
-
-/**
- * firmware_timeout_store() - set number of seconds to wait for firmware
- * @class: device class pointer
- * @attr: device attribute pointer
- * @buf: buffer to scan for timeout value
- * @count: number of bytes in @buf
- *
- *	Sets the number of seconds to wait for the firmware.  Once
- *	this expires an error will be returned to the driver and no
- *	firmware will be provided.
- *
- *	Note: zero means 'wait forever'.
- **/
-static ssize_t timeout_store(struct class *class, struct class_attribute *attr,
-			     const char *buf, size_t count)
-{
-	int tmp_loading_timeout = simple_strtol(buf, NULL, 10);
-
-	if (tmp_loading_timeout < 0)
-		tmp_loading_timeout = 0;
-
-	__fw_fallback_set_timeout(tmp_loading_timeout);
-
-	return count;
-}
-static CLASS_ATTR_RW(timeout);
-
-static struct attribute *firmware_class_attrs[] = {
-	&class_attr_timeout.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(firmware_class);
-
-static void fw_dev_release(struct device *dev)
-{
-	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
-
-	kfree(fw_sysfs);
-}
-
-static int do_firmware_uevent(struct fw_sysfs *fw_sysfs, struct kobj_uevent_env *env)
-{
-	if (add_uevent_var(env, "FIRMWARE=%s", fw_sysfs->fw_priv->fw_name))
-		return -ENOMEM;
-	if (add_uevent_var(env, "TIMEOUT=%i", __firmware_loading_timeout()))
-		return -ENOMEM;
-	if (add_uevent_var(env, "ASYNC=%d", fw_sysfs->nowait))
-		return -ENOMEM;
-
-	return 0;
-}
-
-static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
-{
-	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
-	int err = 0;
-
-	mutex_lock(&fw_lock);
-	if (fw_sysfs->fw_priv)
-		err = do_firmware_uevent(fw_sysfs, env);
-	mutex_unlock(&fw_lock);
-	return err;
-}
-
-static struct class firmware_class = {
-	.name		= "firmware",
-	.class_groups	= firmware_class_groups,
-	.dev_uevent	= firmware_uevent,
-	.dev_release	= fw_dev_release,
-};
-
-int register_sysfs_loader(void)
-{
-	return class_register(&firmware_class);
-}
-
-void unregister_sysfs_loader(void)
-{
-	class_unregister(&firmware_class);
-}
-
-static ssize_t firmware_loading_show(struct device *dev,
-				     struct device_attribute *attr, char *buf)
-{
-	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
-	int loading = 0;
-
-	mutex_lock(&fw_lock);
-	if (fw_sysfs->fw_priv)
-		loading = fw_sysfs_loading(fw_sysfs->fw_priv);
-	mutex_unlock(&fw_lock);
-
-	return sprintf(buf, "%d\n", loading);
-}
-
-/* one pages buffer should be mapped/unmapped only once */
-static int map_fw_priv_pages(struct fw_priv *fw_priv)
-{
-	if (!fw_priv->is_paged_buf)
-		return 0;
-
-	vunmap(fw_priv->data);
-	fw_priv->data = vmap(fw_priv->pages, fw_priv->nr_pages, 0,
-			     PAGE_KERNEL_RO);
-	if (!fw_priv->data)
-		return -ENOMEM;
-	return 0;
-}
-
-/**
- * firmware_loading_store() - set value in the 'loading' control file
- * @dev: device pointer
- * @attr: device attribute pointer
- * @buf: buffer to scan for loading control value
- * @count: number of bytes in @buf
- *
- *	The relevant values are:
- *
- *	 1: Start a load, discarding any previous partial load.
- *	 0: Conclude the load and hand the data to the driver code.
- *	-1: Conclude the load with an error and discard any written data.
- **/
-static ssize_t firmware_loading_store(struct device *dev,
-				      struct device_attribute *attr,
-				      const char *buf, size_t count)
-{
-	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
-	struct fw_priv *fw_priv;
-	ssize_t written = count;
-	int loading = simple_strtol(buf, NULL, 10);
-	int i;
-
-	mutex_lock(&fw_lock);
-	fw_priv = fw_sysfs->fw_priv;
-	if (fw_state_is_aborted(fw_priv))
-		goto out;
-
-	switch (loading) {
-	case 1:
-		/* discarding any previous partial load */
-		if (!fw_sysfs_done(fw_priv)) {
-			for (i = 0; i < fw_priv->nr_pages; i++)
-				__free_page(fw_priv->pages[i]);
-			vfree(fw_priv->pages);
-			fw_priv->pages = NULL;
-			fw_priv->page_array_size = 0;
-			fw_priv->nr_pages = 0;
-			fw_state_start(fw_priv);
-		}
-		break;
-	case 0:
-		if (fw_sysfs_loading(fw_priv)) {
-			int rc;
-
-			/*
-			 * Several loading requests may be pending on
-			 * one same firmware buf, so let all requests
-			 * see the mapped 'buf->data' once the loading
-			 * is completed.
-			 * */
-			rc = map_fw_priv_pages(fw_priv);
-			if (rc)
-				dev_err(dev, "%s: map pages failed\n",
-					__func__);
-			else
-				rc = security_kernel_post_read_file(NULL,
-						fw_priv->data, fw_priv->size,
-						READING_FIRMWARE);
-
-			/*
-			 * Same logic as fw_load_abort, only the DONE bit
-			 * is ignored and we set ABORT only on failure.
-			 */
-			list_del_init(&fw_priv->pending_list);
-			if (rc) {
-				fw_state_aborted(fw_priv);
-				written = rc;
-			} else {
-				fw_state_done(fw_priv);
-			}
-			break;
-		}
-		/* fallthrough */
-	default:
-		dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
-		/* fallthrough */
-	case -1:
-		fw_load_abort(fw_sysfs);
-		break;
-	}
-out:
-	mutex_unlock(&fw_lock);
-	return written;
-}
-
-static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store);
-
-static void firmware_rw_data(struct fw_priv *fw_priv, char *buffer,
-			   loff_t offset, size_t count, bool read)
-{
-	if (read)
-		memcpy(buffer, fw_priv->data + offset, count);
-	else
-		memcpy(fw_priv->data + offset, buffer, count);
-}
-
-static void firmware_rw(struct fw_priv *fw_priv, char *buffer,
-			loff_t offset, size_t count, bool read)
-{
-	while (count) {
-		void *page_data;
-		int page_nr = offset >> PAGE_SHIFT;
-		int page_ofs = offset & (PAGE_SIZE-1);
-		int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
-
-		page_data = kmap(fw_priv->pages[page_nr]);
-
-		if (read)
-			memcpy(buffer, page_data + page_ofs, page_cnt);
-		else
-			memcpy(page_data + page_ofs, buffer, page_cnt);
-
-		kunmap(fw_priv->pages[page_nr]);
-		buffer += page_cnt;
-		offset += page_cnt;
-		count -= page_cnt;
-	}
-}
-
-static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj,
-				  struct bin_attribute *bin_attr,
-				  char *buffer, loff_t offset, size_t count)
-{
-	struct device *dev = kobj_to_dev(kobj);
-	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
-	struct fw_priv *fw_priv;
-	ssize_t ret_count;
-
-	mutex_lock(&fw_lock);
-	fw_priv = fw_sysfs->fw_priv;
-	if (!fw_priv || fw_sysfs_done(fw_priv)) {
-		ret_count = -ENODEV;
-		goto out;
-	}
-	if (offset > fw_priv->size) {
-		ret_count = 0;
-		goto out;
-	}
-	if (count > fw_priv->size - offset)
-		count = fw_priv->size - offset;
-
-	ret_count = count;
-
-	if (fw_priv->data)
-		firmware_rw_data(fw_priv, buffer, offset, count, true);
-	else
-		firmware_rw(fw_priv, buffer, offset, count, true);
-
-out:
-	mutex_unlock(&fw_lock);
-	return ret_count;
-}
-
-static int fw_realloc_pages(struct fw_sysfs *fw_sysfs, int min_size)
-{
-	struct fw_priv *fw_priv= fw_sysfs->fw_priv;
-	int pages_needed = PAGE_ALIGN(min_size) >> PAGE_SHIFT;
-
-	/* If the array of pages is too small, grow it... */
-	if (fw_priv->page_array_size < pages_needed) {
-		int new_array_size = max(pages_needed,
-					 fw_priv->page_array_size * 2);
-		struct page **new_pages;
-
-		new_pages = vmalloc(array_size(new_array_size, sizeof(void *)));
-		if (!new_pages) {
-			fw_load_abort(fw_sysfs);
-			return -ENOMEM;
-		}
-		memcpy(new_pages, fw_priv->pages,
-		       fw_priv->page_array_size * sizeof(void *));
-		memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) *
-		       (new_array_size - fw_priv->page_array_size));
-		vfree(fw_priv->pages);
-		fw_priv->pages = new_pages;
-		fw_priv->page_array_size = new_array_size;
-	}
-
-	while (fw_priv->nr_pages < pages_needed) {
-		fw_priv->pages[fw_priv->nr_pages] =
-			alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
-
-		if (!fw_priv->pages[fw_priv->nr_pages]) {
-			fw_load_abort(fw_sysfs);
-			return -ENOMEM;
-		}
-		fw_priv->nr_pages++;
-	}
-	return 0;
-}
-
-/**
- * firmware_data_write() - write method for firmware
- * @filp: open sysfs file
- * @kobj: kobject for the device
- * @bin_attr: bin_attr structure
- * @buffer: buffer being written
- * @offset: buffer offset for write in total data store area
- * @count: buffer size
- *
- *	Data written to the 'data' attribute will be later handed to
- *	the driver as a firmware image.
- **/
-static ssize_t firmware_data_write(struct file *filp, struct kobject *kobj,
-				   struct bin_attribute *bin_attr,
-				   char *buffer, loff_t offset, size_t count)
-{
-	struct device *dev = kobj_to_dev(kobj);
-	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
-	struct fw_priv *fw_priv;
-	ssize_t retval;
 
-	if (!capable(CAP_SYS_RAWIO))
-		return -EPERM;
+	if (kill_all)
+		fw_load_abort_all = true;
 
-	mutex_lock(&fw_lock);
-	fw_priv = fw_sysfs->fw_priv;
-	if (!fw_priv || fw_sysfs_done(fw_priv)) {
-		retval = -ENODEV;
-		goto out;
-	}
-
-	if (fw_priv->data) {
-		if (offset + count > fw_priv->allocated_size) {
-			retval = -ENOMEM;
-			goto out;
-		}
-		firmware_rw_data(fw_priv, buffer, offset, count, false);
-		retval = count;
-	} else {
-		retval = fw_realloc_pages(fw_sysfs, offset + count);
-		if (retval)
-			goto out;
-
-		retval = count;
-		firmware_rw(fw_priv, buffer, offset, count, false);
-	}
-
-	fw_priv->size = max_t(size_t, offset + count, fw_priv->size);
-out:
 	mutex_unlock(&fw_lock);
-	return retval;
-}
-
-static struct bin_attribute firmware_attr_data = {
-	.attr = { .name = "data", .mode = 0644 },
-	.size = 0,
-	.read = firmware_data_read,
-	.write = firmware_data_write,
-};
-
-static struct attribute *fw_dev_attrs[] = {
-	&dev_attr_loading.attr,
-	NULL
-};
-
-static struct bin_attribute *fw_dev_bin_attrs[] = {
-	&firmware_attr_data,
-	NULL
-};
-
-static const struct attribute_group fw_dev_attr_group = {
-	.attrs = fw_dev_attrs,
-	.bin_attrs = fw_dev_bin_attrs,
-};
-
-static const struct attribute_group *fw_dev_attr_groups[] = {
-	&fw_dev_attr_group,
-	NULL
-};
-
-static struct fw_sysfs *
-fw_create_instance(struct firmware *firmware, const char *fw_name,
-		   struct device *device, enum fw_opt opt_flags)
-{
-	struct fw_sysfs *fw_sysfs;
-	struct device *f_dev;
-
-	fw_sysfs = kzalloc(sizeof(*fw_sysfs), GFP_KERNEL);
-	if (!fw_sysfs) {
-		fw_sysfs = ERR_PTR(-ENOMEM);
-		goto exit;
-	}
-
-	fw_sysfs->nowait = !!(opt_flags & FW_OPT_NOWAIT);
-	fw_sysfs->fw = firmware;
-	f_dev = &fw_sysfs->dev;
-
-	device_initialize(f_dev);
-	dev_set_name(f_dev, "%s", fw_name);
-	f_dev->parent = device;
-	f_dev->class = &firmware_class;
-	f_dev->groups = fw_dev_attr_groups;
-exit:
-	return fw_sysfs;
 }
 
 /**
  * fw_load_sysfs_fallback() - load a firmware via the sysfs fallback mechanism
  * @fw_sysfs: firmware sysfs information for the firmware to load
- * @opt_flags: flags of options, FW_OPT_*
  * @timeout: timeout to wait for the load
  *
  * In charge of constructing a sysfs fallback interface for firmware loading.
  **/
-static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs,
-				  enum fw_opt opt_flags, long timeout)
+static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs, long timeout)
 {
 	int retval = 0;
 	struct device *f_dev = &fw_sysfs->dev;
@@ -559,10 +90,15 @@ static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs,
 	}
 
 	mutex_lock(&fw_lock);
+	if (fw_load_abort_all || fw_state_is_aborted(fw_priv)) {
+		mutex_unlock(&fw_lock);
+		retval = -EINTR;
+		goto out;
+	}
 	list_add(&fw_priv->pending_list, &pending_fw_head);
 	mutex_unlock(&fw_lock);
 
-	if (opt_flags & FW_OPT_UEVENT) {
+	if (fw_priv->opt_flags & FW_OPT_UEVENT) {
 		fw_priv->need_uevent = true;
 		dev_set_uevent_suppress(f_dev, false);
 		dev_dbg(f_dev, "firmware: requesting %s\n", fw_priv->fw_name);
@@ -572,7 +108,7 @@ static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs,
 	}
 
 	retval = fw_sysfs_wait_timeout(fw_priv, timeout);
-	if (retval < 0) {
+	if (retval < 0 && retval != -ENOENT) {
 		mutex_lock(&fw_lock);
 		fw_load_abort(fw_sysfs);
 		mutex_unlock(&fw_lock);
@@ -581,11 +117,10 @@ static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs,
 	if (fw_state_is_aborted(fw_priv)) {
 		if (retval == -ERESTARTSYS)
 			retval = -EINTR;
-		else
-			retval = -EAGAIN;
 	} else if (fw_priv->is_paged_buf && !fw_priv->data)
 		retval = -ENOMEM;
 
+out:
 	device_del(f_dev);
 err_put_dev:
 	put_device(f_dev);
@@ -594,7 +129,7 @@ err_put_dev:
 
 static int fw_load_from_user_helper(struct firmware *firmware,
 				    const char *name, struct device *device,
-				    enum fw_opt opt_flags)
+				    u32 opt_flags)
 {
 	struct fw_sysfs *fw_sysfs;
 	long timeout;
@@ -624,10 +159,10 @@ static int fw_load_from_user_helper(struct firmware *firmware,
 	}
 
 	fw_sysfs->fw_priv = firmware->priv;
-	ret = fw_load_sysfs_fallback(fw_sysfs, opt_flags, timeout);
+	ret = fw_load_sysfs_fallback(fw_sysfs, timeout);
 
 	if (!ret)
-		ret = assign_fw(firmware, device, opt_flags);
+		ret = assign_fw(firmware, device);
 
 out_unlock:
 	usermodehelper_read_unlock();
@@ -635,7 +170,7 @@ out_unlock:
 	return ret;
 }
 
-static bool fw_force_sysfs_fallback(enum fw_opt opt_flags)
+static bool fw_force_sysfs_fallback(u32 opt_flags)
 {
 	if (fw_fallback_config.force_sysfs_fallback)
 		return true;
@@ -644,7 +179,7 @@ static bool fw_force_sysfs_fallback(enum fw_opt opt_flags)
 	return true;
 }
 
-static bool fw_run_sysfs_fallback(enum fw_opt opt_flags)
+static bool fw_run_sysfs_fallback(u32 opt_flags)
 {
 	int ret;
 
@@ -653,13 +188,13 @@ static bool fw_run_sysfs_fallback(enum fw_opt opt_flags)
 		return false;
 	}
 
-	if ((opt_flags & FW_OPT_NOFALLBACK))
+	if ((opt_flags & FW_OPT_NOFALLBACK_SYSFS))
 		return false;
 
 	/* Also permit LSMs and IMA to fail firmware sysfs fallback */
-	ret = security_kernel_load_data(LOADING_FIRMWARE);
+	ret = security_kernel_load_data(LOADING_FIRMWARE, true);
 	if (ret < 0)
-		return ret;
+		return false;
 
 	return fw_force_sysfs_fallback(opt_flags);
 }
@@ -669,31 +204,33 @@ static bool fw_run_sysfs_fallback(enum fw_opt opt_flags)
  * @fw: pointer to firmware image
  * @name: name of firmware file to look for
  * @device: device for which firmware is being loaded
- * @opt_flags: options to control firmware loading behaviour
+ * @opt_flags: options to control firmware loading behaviour, as defined by
+ *	       &enum fw_opt
  * @ret: return value from direct lookup which triggered the fallback mechanism
  *
  * This function is called if direct lookup for the firmware failed, it enables
  * a fallback mechanism through userspace by exposing a sysfs loading
- * interface. Userspace is in charge of loading the firmware through the syfs
- * loading interface. This syfs fallback mechanism may be disabled completely
+ * interface. Userspace is in charge of loading the firmware through the sysfs
+ * loading interface. This sysfs fallback mechanism may be disabled completely
  * on a system by setting the proc sysctl value ignore_sysfs_fallback to true.
- * If this false we check if the internal API caller set the @FW_OPT_NOFALLBACK
- * flag, if so it would also disable the fallback mechanism. A system may want
- * to enfoce the sysfs fallback mechanism at all times, it can do this by
- * setting ignore_sysfs_fallback to false and force_sysfs_fallback to true.
+ * If this is false we check if the internal API caller set the
+ * @FW_OPT_NOFALLBACK_SYSFS flag, if so it would also disable the fallback
+ * mechanism. A system may want to enforce the sysfs fallback mechanism at all
+ * times, it can do this by setting ignore_sysfs_fallback to false and
+ * force_sysfs_fallback to true.
  * Enabling force_sysfs_fallback is functionally equivalent to build a kernel
  * with CONFIG_FW_LOADER_USER_HELPER_FALLBACK.
  **/
 int firmware_fallback_sysfs(struct firmware *fw, const char *name,
 			    struct device *device,
-			    enum fw_opt opt_flags,
+			    u32 opt_flags,
 			    int ret)
 {
 	if (!fw_run_sysfs_fallback(opt_flags))
 		return ret;
 
 	if (!(opt_flags & FW_OPT_NO_WARN))
-		dev_warn(device, "Falling back to syfs fallback for: %s\n",
+		dev_warn(device, "Falling back to sysfs fallback for: %s\n",
 				 name);
 	else
 		dev_dbg(device, "Falling back to sysfs fallback for: %s\n",