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