| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 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 | } |