请教如何处理android获取磁盘使用情况函数statfs，模拟返回磁盘空间大小

[weechatfly]

这个函数在syscall hook中有处理：
case 266:
u.reg_write(ArmConst.UC_ARM_REG_R0, statfs(emulator));
return;
我想模拟返回磁盘空间大小，该如何处理？谢谢！

[zhkl0228]

暂时先自己改unidbg源码实现

[weechatfly]

我自己改了一下，会出现错误
[19:36:57 292] DEBUG [cn.banny.unidbg.pointer.UnicornPointer] (UnicornPointer:295) - getString pointer=unicorn@0x4017f430[libnative-lib.so]0x16430, size=7, encoding=UTF-8, ret=/sdcard
[19:36:57 292] ERROR [cn.banny.unidbg.linux.ARMSyscallHandler] (ARMSyscallHandler:1367) - statfs pathPointer=unicorn@0x4017f430[libnative-lib.so]0x16430, buf=unicorn@0x58, path=/sdcard
[19:36:57 293] WARN [cn.banny.unidbg.linux.ARMSyscallHandler] (ARMSyscallHandler:402) - handleInterrupt intno=2, NR=266, svcNumber=0x0, PC=unicorn@0x40046210[libc.so]0x42210, syscall=null
unicorn.UnicornException: Invalid memory write (UC_ERR_WRITE_UNMAPPED)
at unicorn.Unicorn.mem_write(Native Method)
at cn.banny.unidbg.pointer.UnicornPointer.write(UnicornPointer.java:135)
at cn.banny.unidbg.pointer.UnicornPointer.setByte(UnicornPointer.java:315)
at cn.banny.unidbg.linux.ARMSyscallHandler.statfs(ARMSyscallHandler.java:1374)
at cn.banny.unidbg.linux.ARMSyscallHandler.hook(ARMSyscallHandler.java:322)
at unicorn.Unicorn.invokeInterruptCallbacks(Unicorn.java:123)
at unicorn.Unicorn.emu_start(Native Method)
at cn.banny.unidbg.AbstractEmulator.emulate(AbstractEmulator.java:302)
at cn.banny.unidbg.AbstractEmulator.eFunc(AbstractEmulator.java:400)
at cn.banny.unidbg.arm.AbstractARMEmulator.eFunc(AbstractARMEmulator.java:202)
at cn.banny.unidbg.linux.LinuxModule.emulateFunction(LinuxModule.java:203)
at cn.banny.unidbg.linux.android.dvm.DvmClass.callStaticJniMethod(DvmClass.java:209)
at cn.banny.unidbg.android.dx.AndSoTest.testRomxSdk(AndSoTest.java:909)
at [cn.banny.unidbg.android.dx.AndSoTest.main(AndSoTest.java:901)](url)

[weechatfly]

测试示例：
DvmClass testClass = vm.resolveClass("com/easy/dx/MainActivity");
Number ret = testClass.callStaticJniMethod(emulator,
"stringFromJNI()Ljava/lang/String;");

        long hash = ret.intValue() & 0xffffffffL;
        String result = "";
        StringObject st1 = vm.getObject(hash);
        if(st1!=null)
        {
            result = st1.getValue();
            System.out.println("result: "+result);
        }
        else{
            System.out.println("result null");
        }

libnative-lib.so.zip