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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e477f3f0 AH |
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 | } |