on program startup, choose random 32- or 64-bit number as canary; write-protect that part of memory
store canary XOR return addr between saved %ebp and first local variable
on return, check canary to see if we're returning to the same place we expected
More info: look for StackGuard, by Wagle and Cowan
on program startup, choose random 32- or 64-bit number as canary; write-protect that part of memory store canary XOR return addr between saved %ebp and first local variable on return, check canary to see if we're returning to the same place we expected
More info: look for StackGuard, by Wagle and Cowan