cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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main.c (1114B)

      1// SPDX-License-Identifier: GPL-2.0
      2#define _GNU_SOURCE
      3#include <sys/uio.h>
      4#include <errno.h>
      5#include <stdio.h>
      6#include <sys/socket.h>
      7#include <fcntl.h>
      8#include <unistd.h>
      9#include "../../include/uapi/linux/bpf.h"
     10#include <asm/unistd.h>
     11#include "msgfmt.h"
     12
     13FILE *debug_f;
     14
     15static int handle_get_cmd(struct mbox_request *cmd)
     16{
     17	switch (cmd->cmd) {
     18	case 0:
     19		return 0;
     20	default:
     21		break;
     22	}
     23	return -ENOPROTOOPT;
     24}
     25
     26static int handle_set_cmd(struct mbox_request *cmd)
     27{
     28	return -ENOPROTOOPT;
     29}
     30
     31static void loop(void)
     32{
     33	while (1) {
     34		struct mbox_request req;
     35		struct mbox_reply reply;
     36		int n;
     37
     38		n = read(0, &req, sizeof(req));
     39		if (n != sizeof(req)) {
     40			fprintf(debug_f, "invalid request %d\n", n);
     41			return;
     42		}
     43
     44		reply.status = req.is_set ?
     45			handle_set_cmd(&req) :
     46			handle_get_cmd(&req);
     47
     48		n = write(1, &reply, sizeof(reply));
     49		if (n != sizeof(reply)) {
     50			fprintf(debug_f, "reply failed %d\n", n);
     51			return;
     52		}
     53	}
     54}
     55
     56int main(void)
     57{
     58	debug_f = fopen("/dev/kmsg", "w");
     59	setvbuf(debug_f, 0, _IOLBF, 0);
     60	fprintf(debug_f, "<5>Started bpfilter\n");
     61	loop();
     62	fclose(debug_f);
     63	return 0;
     64}