On 30/10/23 17:06, Miklos Szeredi wrote:
On Mon, Oct 30, 2023 at 6:45 AM Ian Kent <raven@xxxxxxxxxx> wrote:
Is fs/namespace.c:iterate_mounts() a problem?
It's called from:
1) ./kernel/audit_tree.c:709: if (iterate_mounts(compare_root,
2) ./kernel/audit_tree.c:839: err = iterate_mounts(tag_mount, tree, mnt);
3) ./kernel/audit_tree.c:917: failed = iterate_mounts(tag_mount,
tree, tagged);
From functions 1) audit_trim_trees(), 2) audit_add_tree_rule() and
3) audit_tag_tree().
So that interface works like this:
- collect_mounts() creates a temporary copy of a mount tree, mounts
are chained on mnt_list.
Right, sorry for the noise, I didn't look far enough.
Ian
- iterate_mounts() is used to do some work on the temporary tree
- drop_collected_mounts() frees the temporary tree
These mounts are never installed in a namespace. My guess is that a
private copy is used instead of the original mount tree to prevent
races.
Thanks,
Miklos
