mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-23 10:15:57 +01:00
42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
/* Check if we were able to remove certain sources of randomness
|
|
* across boots using different techniques:
|
|
*
|
|
* - QEMU icount record replay
|
|
* - norandmaps boot parameter
|
|
*
|
|
* You might want to run this as the init process to further remove undeterminism. */
|
|
|
|
#include <inttypes.h>
|
|
#include <signal.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
|
|
int bss = 0;
|
|
int data = 1;
|
|
|
|
int main(__attribute__((unused)) int argc, char **argv) {
|
|
int i, *ip;
|
|
uint64_t uint64;
|
|
FILE *fp;
|
|
|
|
printf("time(NULL) = %ju\n", (uintmax_t)time(NULL));
|
|
printf("&i = %p\n", (void *)&i);
|
|
printf("&argv[0] = %p\n", (void *)&argv[0]);
|
|
printf("&main = %p\n", (void *)(intptr_t)main);
|
|
printf("&bss = %p\n", (void *)&bss);
|
|
printf("&data = %p\n", (void *)&data);
|
|
|
|
/* malloc */
|
|
ip = malloc(sizeof(*ip));
|
|
printf("&malloc = %p\n", (void *)ip);
|
|
free(ip);
|
|
|
|
/* /dev/urandom */
|
|
fp = fopen("/dev/urandom", "rb");
|
|
fread(&uint64, sizeof(uint64), 1, fp);
|
|
printf("/dev/urandom = %" PRIx64 "\n", uint64);
|
|
fclose(fp);
|
|
}
|