DivestOS/Patches/Linux_CVEs/CVE-2017-0445/ANY/0004.patch

From fe160e51f02ee5db529c2e84ac8364c89cce005e Mon Sep 17 00:00:00 2001
From: Andrew Chant <achant@google.com>
Date: Tue, 6 Dec 2016 20:59:01 -0800
Subject: [PATCH] input: synaptics_dsx: remove some sysfs nodes.

Remove most sysfs entrypoints to fw_update module.
Retains check_fw, which is triggered from an
init script.

BUG: 32769717
Change-Id: I710cb37a8b5382dce7aa6a1d8748be5853a18a7a
Signed-off-by: Andrew Chant <achant@google.com>
---
 drivers/input/touchscreen/Kconfig               | 10 ++++++++++
 drivers/input/touchscreen/synaptics_fw_update.c | 20 ++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index a42fea5862af2..64266998c2290 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -1019,6 +1019,16 @@ config TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE
 	  To compile this driver as a module, choose M here: the
 	  module will be called synaptics_dsx_fw_update.
 
+config TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
+	bool "Synaptics DSX firmware update extra sysfs attributes"
+	depends on TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE
+	help
+	  Say Y here to enable support for extra sysfs attributes
+	  supporting firmware update in a development environment.
+	  This does not affect the core or other subsystem attributes.
+
+	  If unsure, say N.
+
 config SECURE_TOUCH
 	bool "Secure Touch"
 	depends on (TOUCHSCREEN_ATMEL_MXT || TOUCHSCREEN_SYNAPTICS_I2C_RMI4 || \
diff --git a/drivers/input/touchscreen/synaptics_fw_update.c b/drivers/input/touchscreen/synaptics_fw_update.c
index 8891f1c836684..360e455a5a51b 100644
--- a/drivers/input/touchscreen/synaptics_fw_update.c
+++ b/drivers/input/touchscreen/synaptics_fw_update.c
@@ -1331,6 +1331,7 @@ static int fwu_do_write_config(void)
 	return retval;
 }
 
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 static int fwu_start_write_config(void)
 {
 	int retval;
@@ -1383,6 +1384,7 @@ static int fwu_start_write_config(void)
 
 	return retval;
 }
+#endif
 
 static int fwu_do_write_lockdown(bool reset)
 {
@@ -1430,6 +1432,7 @@ static int fwu_do_write_lockdown(bool reset)
 	return retval;
 }
 
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 static int fwu_start_write_lockdown(void)
 {
 	if (parse_header())
@@ -1533,6 +1536,7 @@ static int fwu_do_read_config(void)
 exit:
 	return retval;
 }
+#endif
 
 static int fwu_do_reflash(void)
 {
@@ -1767,6 +1771,7 @@ int synaptics_fw_updater(void)
 }
 EXPORT_SYMBOL(synaptics_fw_updater);
 
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 static ssize_t fwu_sysfs_show_image(struct file *data_file,
 		struct kobject *kobj, struct bin_attribute *attributes,
 		char *buf, loff_t pos, size_t count)
@@ -2021,6 +2026,7 @@ static ssize_t fwu_sysfs_write_lockdown_store(struct device *dev,
 	mutex_unlock(&fwu_sysfs_mutex);
 	return retval;
 }
+#endif
 
 static ssize_t fwu_sysfs_check_fw_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
@@ -2044,6 +2050,7 @@ static ssize_t fwu_sysfs_check_fw_store(struct device *dev,
 	return count;
 }
 
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 static ssize_t fwu_sysfs_write_config_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
@@ -2265,6 +2272,7 @@ static ssize_t fwu_sysfs_package_id_show(struct device *dev,
 		(pkg_id[1] << 8) | pkg_id[0],
 		(pkg_id[3] << 8) | pkg_id[2]);
 }
+#endif
 
 static int synaptics_rmi4_debug_dump_info(struct seq_file *m, void *v)
 {
@@ -2298,6 +2306,7 @@ static void synaptics_rmi4_fwu_attn(struct synaptics_rmi4_data *rmi4_data,
 	return;
 }
 
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 static struct bin_attribute dev_attr_data = {
 	.attr = {
 		.name = "data",
@@ -2307,8 +2316,10 @@ static struct bin_attribute dev_attr_data = {
 	.read = fwu_sysfs_show_image,
 	.write = fwu_sysfs_store_image,
 };
+#endif
 
 static struct device_attribute attrs[] = {
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 	__ATTR(fw_name, S_IRUGO | S_IWUSR | S_IWGRP,
 			fwu_sysfs_image_name_show,
 			fwu_sysfs_image_name_store),
@@ -2318,9 +2329,11 @@ static struct device_attribute attrs[] = {
 	__ATTR(update_fw, S_IWUSR | S_IWGRP,
 			NULL,
 			fwu_sysfs_do_reflash_store),
+#endif
 	__ATTR(check_fw, S_IWUSR | S_IWGRP,
 			NULL,
 			fwu_sysfs_check_fw_store),
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 	__ATTR(writeconfig, S_IWUSR | S_IWGRP,
 			NULL,
 			fwu_sysfs_write_config_store),
@@ -2360,6 +2373,7 @@ static struct device_attribute attrs[] = {
 	__ATTR(package_id, S_IRUGO,
 			fwu_sysfs_package_id_show,
 			synaptics_rmi4_store_error),
+#endif
 };
 
 
@@ -2470,6 +2484,7 @@ static int synaptics_rmi4_fwu_init(struct synaptics_rmi4_data *rmi4_data)
 	INIT_DELAYED_WORK(&fwu->fwu_work, synaptics_rmi4_fwu_work);
 #endif
 
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 	retval = sysfs_create_bin_file(&rmi4_data->i2c_client->dev.kobj,
 			&dev_attr_data);
 	if (retval < 0) {
@@ -2478,6 +2493,7 @@ static int synaptics_rmi4_fwu_init(struct synaptics_rmi4_data *rmi4_data)
 				__func__);
 		goto exit_free_mem;
 	}
+#endif
 
 	for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) {
 		retval = sysfs_create_file(&rmi4_data->i2c_client->dev.kobj,
@@ -2511,7 +2527,9 @@ static int synaptics_rmi4_fwu_init(struct synaptics_rmi4_data *rmi4_data)
 				&attrs[attr_count].attr);
 	}
 
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 	sysfs_remove_bin_file(&rmi4_data->input_dev->dev.kobj, &dev_attr_data);
+#endif
 
 exit_free_mem:
 	kfree(fwu->fn_ptr);
@@ -2528,7 +2546,9 @@ static void synaptics_rmi4_fwu_remove(struct synaptics_rmi4_data *rmi4_data)
 {
 	unsigned char attr_count;
 
+#ifdef CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE_EXTRA_SYSFS
 	sysfs_remove_bin_file(&rmi4_data->input_dev->dev.kobj, &dev_attr_data);
+#endif
 
 	for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) {
 		sysfs_remove_file(&rmi4_data->input_dev->dev.kobj,