diff options
| author | Aleksa Sarai <cyphar@cyphar.com> | 2019-12-07 01:13:26 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-11 07:51:14 +0100 |
| commit | fd59f1e5f261bf73af661a8b5c3eca6615889aad (patch) | |
| tree | 14d51f4b5623ba6b21de4c0cda003a69422b860c /include/linux/debugobjects.h | |
| parent | cb8bca3299e579908b987fe10de1a69eb7f39562 (diff) | |
namei: only return -ECHILD from follow_dotdot_rcu()
commit 2b98149c2377bff12be5dd3ce02ae0506e2dd613 upstream.
It's over-zealous to return hard errors under RCU-walk here, given that
a REF-walk will be triggered for all other cases handling ".." under
RCU.
The original purpose of this check was to ensure that if a rename occurs
such that a directory is moved outside of the bind-mount which the
resolution started in, it would be detected and blocked to avoid being
able to mess with paths outside of the bind-mount. However, triggering a
new REF-walk is just as effective a solution.
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Fixes: 397d425dc26d ("vfs: Test for and handle paths that are unreachable from their mnt_root")
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/debugobjects.h')
0 files changed, 0 insertions, 0 deletions