cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

mlock2.h (1065B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#include <syscall.h>
      3#include <errno.h>
      4#include <stdio.h>
      5#include <stdlib.h>
      6
      7#ifndef MLOCK_ONFAULT
      8#define MLOCK_ONFAULT 1
      9#endif
     10
     11#ifndef MCL_ONFAULT
     12#define MCL_ONFAULT (MCL_FUTURE << 1)
     13#endif
     14
     15static int mlock2_(void *start, size_t len, int flags)
     16{
     17#ifdef __NR_mlock2
     18	return syscall(__NR_mlock2, start, len, flags);
     19#else
     20	errno = ENOSYS;
     21	return -1;
     22#endif
     23}
     24
     25static FILE *seek_to_smaps_entry(unsigned long addr)
     26{
     27	FILE *file;
     28	char *line = NULL;
     29	size_t size = 0;
     30	unsigned long start, end;
     31	char perms[5];
     32	unsigned long offset;
     33	char dev[32];
     34	unsigned long inode;
     35	char path[BUFSIZ];
     36
     37	file = fopen("/proc/self/smaps", "r");
     38	if (!file) {
     39		perror("fopen smaps");
     40		_exit(1);
     41	}
     42
     43	while (getline(&line, &size, file) > 0) {
     44		if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",
     45			   &start, &end, perms, &offset, dev, &inode, path) < 6)
     46			goto next;
     47
     48		if (start <= addr && addr < end)
     49			goto out;
     50
     51next:
     52		free(line);
     53		line = NULL;
     54		size = 0;
     55	}
     56
     57	fclose(file);
     58	file = NULL;
     59
     60out:
     61	free(line);
     62	return file;
     63}