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| author | Oleg Nesterov <oleg@redhat.com> | 2017-01-30 19:17:35 +0100 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2017-02-01 06:20:48 +0100 |
| commit | c6c70f4455d1eda91065e93cc4f7eddf4499b105 (patch) | |
| tree | bf2f38330bc30a13329ae275172deffe863b36a8 /fs/super.c | |
| parent | vfs: open() with O_CREAT should not create inodes with unknown ids (diff) | |
| download | linux-c6c70f4455d1eda91065e93cc4f7eddf4499b105.tar.xz linux-c6c70f4455d1eda91065e93cc4f7eddf4499b105.zip | |
exit: fix the setns() && PR_SET_CHILD_SUBREAPER interaction
find_new_reaper() checks same_thread_group(reaper, child_reaper) to
prevent the cross-namespace reparenting but this is not enough if the
exiting parent was injected by setns() + fork().
Suppose we have a process P in the root namespace and some namespace X.
P does setns() to enter the X namespace, and forks the child C.
C forks a grandchild G and exits.
The grandchild G should be re-parented to X->child_reaper, but in this
case the ->real_parent chain does not lead to ->child_reaper, so it will
be wrongly reparanted to P's sub-reaper or a global init.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'fs/super.c')
0 files changed, 0 insertions, 0 deletions