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namespace: drop all mounts outside of the new root directory

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There's no point in mounting these, if they are outside of the root directory
we'll move to.
This commit is contained in:
Lennart Poettering 2016-08-26 17:25:40 +02:00 committed by Djalal Harouni
parent 54500613a4
commit cd2902c954
1 changed files with 26 additions and 0 deletions
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26
src/core/namespace.c
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@ -199,6 +199,31 @@ static void drop_nop(BindMount *m, unsigned *n) {
*n = t - m;
}
static void drop_outside_root(const char *root_directory, BindMount *m, unsigned *n) {
BindMount *f, *t;
assert(m);
assert(n);
if (!root_directory)
return;
/* Drops all mounts that are outside of the root directory. */
for (f = m, t = m; f < m+*n; f++) {
if (!path_startswith(f->path, root_directory)) {
log_debug("%s is outside of root directory.", f->path);
continue;
}
*t = *f;
t++;
}
*n = t - m;
}
static int mount_dev(BindMount *m) {
static const char devnodes[] =
"/dev/null\0"
@ -631,6 +656,7 @@ int setup_namespace(
qsort(mounts, n, sizeof(BindMount), mount_path_compare);
drop_duplicates(mounts, &n);
drop_outside_root(root_directory, mounts, &n);
drop_inaccessible(mounts, &n);
drop_nop(mounts, &n);
}