История изменений

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

int 
main(void)
{
        char *s;
        size_t sz = sysconf(_SC_PAGESIZE);

        s = malloc(sz);
        assert(s);

        printf("%x\n", s[sz]);

        free(s);

        return 0;
}

$ uname -a && make m && ./m 
OpenBSD dim13.org 5.4 GENERIC.MP#41 amd64
cc -O2 -pipe -o m m.c 
Segmentation fault (core dumped)

$ uname -a && make m && ./m
Linux otto 3.2.0-4-amd64 #1 SMP Debian 3.2.51-1 x86_64 GNU/Linux
cc     m.c   -o m
0