I need some help with drawing the stack at 3 different points in the execution of a segment of code. Specifically, I need to draw the stack and detail what is located on the stack and where at the following points:

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1) Before the code starts executing the function Gets (so the instance after the call is executed, but before any code from "gets" executed,) and should show where any information from the functions "test" and "getbuf" is located on the stack

2) Just before the ret in your exploit string gets executed.

3) Just before "hexmatch" has executed its ret.

It is also important that the diagrams include what address "rsp" and "rbp" are referencing.

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The segment of code referred to is the following:

unsigned getbuf() { char buf[BUFFER_SIZE]; Gets(buf); return 1; } void test() { int val; val = getbuf(); printf("No exploit. Getbuf returned 0x%x ", val); } /*Compare string to hex represention of unsigned value*/ int hexmatch(unsigned val, char *sval) { char cbuf[110]; /*Make position of check string unpredictable*/ char *s = cbuf + random() % 100; sprintf(s, "%.8x", val); return strncmp(sval, s, 9) == 0; } void touch3(char *sval){ vlevel = 3; /*Part of validation protocol*/ if (hexmatch(cookie, sval)) { printf("Touch3!: You called touch3(\"%s\") ", sval); validate(3); } else { printf("Misfire: You called touch3(\"%s\") ", sval); fail(3); } exit(0); }

For further reference, this segment of code comes from the Attack Lab assignment, though the drawing of the stack is not part of the Lab itself.