From 4159aedfaa35e9a41ba9478b7bb00f661c6646d3 Mon Sep 17 00:00:00 2001
From: Dees Troy <dees_troy@teamw.in>
Date: Fri, 28 Feb 2014 17:24:43 +0000
Subject: Restore capabilities to run-as binary

Change-Id: I9e2b8e9b69c94b94c57143c04b950530490ec33e
---
 Android.mk           |  3 +++
 partition.cpp        | 31 +++++++++++++++++++++++++++++--
 partitionmanager.cpp |  2 +-
 3 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/Android.mk b/Android.mk
index c6c7f3c40..013e4e1b5 100644
--- a/Android.mk
+++ b/Android.mk
@@ -272,6 +272,9 @@ ifeq ($(TARGET_RECOVERY_QCOM_RTC_FIX),)
 else ifeq ($(TARGET_RECOVERY_QCOM_RTC_FIX),true)
     LOCAL_CFLAGS += -DQCOM_RTC_FIX
 endif
+ifneq ($(wildcard bionic/libc/include/sys/capability.h),)
+    LOCAL_CFLAGS += -DHAVE_CAPABILITIES
+endif
 
 include $(BUILD_EXECUTABLE)
 
diff --git a/partition.cpp b/partition.cpp
index 57a692349..172633c07 100644
--- a/partition.cpp
+++ b/partition.cpp
@@ -63,6 +63,11 @@ extern "C" {
 #include "selinux/selinux.h"
 #include <selinux/label.h>
 #endif
+#ifdef HAVE_CAPABILITIES
+#include <sys/capability.h>
+#include <sys/xattr.h>
+#include <linux/xattr.h>
+#endif
 
 using namespace std;
 
@@ -1699,6 +1704,7 @@ bool TWPartition::Restore_Tar(string restore_folder, string Restore_File_System)
 	string Full_FileName, Command;
 	int index = 0;
 	char split_index[5];
+	bool ret = false;
 
 	if (Has_Android_Secure) {
 		if (!Wipe_AndSec())
@@ -1726,8 +1732,29 @@ bool TWPartition::Restore_Tar(string restore_folder, string Restore_File_System)
 		tar.setpassword(Password);
 #endif
 	if (tar.extractTarFork() != 0)
-		return false;
-	return true;
+		ret = false;
+	else
+		ret = true;
+#ifdef HAVE_CAPABILITIES
+	// Restore capabilities to the run-as binary
+	if (Mount_Point == "/system" && Mount(true) && TWFunc::Path_Exists("/system/bin/run-as")) {
+		struct vfs_cap_data cap_data;
+		uint64_t capabilities = (1 << CAP_SETUID) | (1 << CAP_SETGID);
+
+		memset(&cap_data, 0, sizeof(cap_data));
+		cap_data.magic_etc = VFS_CAP_REVISION | VFS_CAP_FLAGS_EFFECTIVE;
+		cap_data.data[0].permitted = (uint32_t) (capabilities & 0xffffffff);
+		cap_data.data[0].inheritable = 0;
+		cap_data.data[1].permitted = (uint32_t) (capabilities >> 32);
+		cap_data.data[1].inheritable = 0;
+		if (setxattr("/system/bin/run-as", XATTR_NAME_CAPS, &cap_data, sizeof(cap_data), 0) < 0) {
+			LOGINFO("Failed to reset capabilities of /system/bin/run-as binary.\n");
+		} else {
+			LOGINFO("Reset capabilities of /system/bin/run-as binary successful.\n");
+		}
+	}
+#endif
+	return ret;
 }
 
 bool TWPartition::Restore_DD(string restore_folder) {
diff --git a/partitionmanager.cpp b/partitionmanager.cpp
index e6193f919..db054d28d 100644
--- a/partitionmanager.cpp
+++ b/partitionmanager.cpp
@@ -1829,7 +1829,7 @@ void TWPartitionManager::Get_Partition_List(string ListType, std::vector<Partiti
 			while (end_pos != string::npos && start_pos < Restore_List.size()) {
 				restore_path = Restore_List.substr(start_pos, end_pos - start_pos);
 				if ((restore_part = Find_Partition_By_Path(restore_path)) != NULL) {
-					if (restore_part->Backup_Name == "recovery" && !restore_part->Can_Be_Backed_Up || restore_part->Is_SubPartition) {
+					if ((restore_part->Backup_Name == "recovery" && !restore_part->Can_Be_Backed_Up) || restore_part->Is_SubPartition) {
 						// Don't allow restore of recovery (causes problems on some devices)
 						// Don't add subpartitions to the list of items
 					} else {
-- 
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