Follow ghost Brother to learn how to modify so. 3. Answer: so

Follow ghost Brother to learn how to modify so. 3. Answer: so

Several analyzed articles:

Http://www.pd521.com/thread-114-1-1.html (xxoo)

Http://www.pd521.com/thread-113-1-1.html myoldid (reply, 1, 2, 3)

 

 

For software analysis, you don't need to talk about this process. Let's just look at it. The following is the idea after the analysis.

Details are not described:

Key points of the smali layer:

Key points of the native layer:

0x1:

Modify the smali layer and set the input parameter v0 to the int value 1.

 

0x2:

For this apk, search for the Normal User displayed by default

Wait for the length to modify the string. Extra spaces are not required to fill in:

0x3:

Determine the input parameter, mainly R2. Therefore, compare R2 with several numbers. Therefore, replace this parameter with the change command 00, then the program must follow the following Gold Vip process.

Here we can also change BNE to BEQ, with the same effect, but we recommend that you use the method above.

0x4:

The core parameter is input R2. According to the assembly code below, R2 = 1 is the key point.

Therefore, after the push command is complete, modify the first CMP and BEQ.

Mov R2, #1, Nop.

If you modify it directly, multiple BEQ operations below are useless, so you can drop the Nop directly.

That is, 01 20, 00 00

 

Source code reference:

 

After reading this, we can compare the results of the so analysis. Naturally, we will understand that we can simply summarize the similar situation in so, either if else or switch.

<span style="font-size:18px;">JNIEXPORT jstring JNICALL Java_com_ggndktest1_JniGg_VipLevel  (JNIEnv * env, jobject this,jint a){int c=(int)a;const char* vip = "";switch(c) {case 1:vip= "Gold Vip";break;case 2:vip="Silvery Vip";break;case 3:vip="Copper Vip";break;default:vip="Normal User";break;}return (*env)->NewStringUTF(env, vip);}</span>

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