find-vdso-map.c

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// SPDX-License-Identifier: GPL-2.0
static int find_vdso_map(void **start, void **end)
{
    FILE *maps;
    char line[128];
    int found = 0;

    maps = fopen("/proc/self/maps", "r");
    if (!maps) {
        fprintf(stderr, "vdso: cannot open maps\n");
        return -1;
    }

    while (!found && fgets(line, sizeof(line), maps)) {
        int m = -1;

        /* We care only about private r-x mappings. */
        if (2 != sscanf(line, "%p-%p r-xp %*x %*x:%*x %*u %n",
                start, end, &m))
            continue;
        if (m < 0)
            continue;

        if (!strncmp(&line[m], VDSO__MAP_NAME,
                 sizeof(VDSO__MAP_NAME) - 1))
            found = 1;
    }

    fclose(maps);
    return !found;
}