1 // SPDX-License-Identifier: GPL-2.0
find_vdso_map(void ** start,void ** end)2 static int find_vdso_map(void **start, void **end)
3 {
4 FILE *maps;
5 char line[128];
6 int found = 0;
7
8 maps = fopen("/proc/self/maps", "r");
9 if (!maps) {
10 fprintf(stderr, "vdso: cannot open maps\n");
11 return -1;
12 }
13
14 while (!found && fgets(line, sizeof(line), maps)) {
15 int m = -1;
16
17 /* We care only about private r-x mappings. */
18 if (2 != sscanf(line, "%p-%p r-xp %*x %*x:%*x %*u %n",
19 start, end, &m))
20 continue;
21 if (m < 0)
22 continue;
23
24 if (!strncmp(&line[m], VDSO__MAP_NAME,
25 sizeof(VDSO__MAP_NAME) - 1))
26 found = 1;
27 }
28
29 fclose(maps);
30 return !found;
31 }
32
