Regarding w1, project1 Question explanation.

[ritwik-20198]

Q.What input do you provide to the program so that ptrs[s] reads (and then tries to execute) the contents of local variable p instead of a function pointer stored in the buffer pointed to by ptrs? You can determine the answer by performing a little arithmetic on the addresses you have already gathered above -- be careful that you take into account the size of a pointer when doing pointer arithmetic. If successful, you will end up executing the pat_on_back function. Enter your answer as an unsigned integer.

your Solution:
(p-ptrs)/4 is
print /x (0xbffff534 - 0x804a0d4)/4
0x2dfed518 or 771675416

** can you please explain this, how did you do this??
wisdom-alt code.txt

[Usagi-Yojimbo-x]

It's pointer arithmetic.
When you set s=2, ptrs[2] = *(ptrs + 2);
In memory, It will access the address ptrs + 2 * sizeof(fptr); // size of fptr is 4 bytes
We wanna access 0xbffff534 which is address of p.
In this case, we have to find ptrs[???] or s = ?.
So we find the difference between p and ptrs, then divide the result by size of fptr.
ptrs[771675416] is 0xbffff534, address of p.

Hope this helps...