** Changed in: linux (Ubuntu Groovy)
Status: In Progress => Invalid
** Description changed:
- When net_prio and net_cls cgroups are used, cgroup refcount is bogus, as
- it's not incremented anymore, but decremented when sockets are closed.
+ [Impact]
+ When net_prio and net_cls cgroups are used, cgroup refcount is bogus, as it's
not incremented anymore, but decremented when sockets are closed.
This might lead to crashes possibly because of use-after-free when
packets are received as shown in LP #1886668.
- Cascardo.
+ [Test case]
+ Ran reproducer from comment #2.
+
+ [Regression potential]
+ We could break the use of cgroup bpf. The use of cgroup bpf looks to still be
working from the reproducer.
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https://bugs.launchpad.net/bugs/1886860
Title:
cgroup refcount is bogus when cgroup_sk_alloc is disabled
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Bionic:
In Progress
Status in linux source package in Eoan:
In Progress
Status in linux source package in Focal:
In Progress
Status in linux source package in Groovy:
Invalid
Bug description:
[Impact]
When net_prio and net_cls cgroups are used, cgroup refcount is bogus, as it's
not incremented anymore, but decremented when sockets are closed.
This might lead to crashes possibly because of use-after-free when
packets are received as shown in LP #1886668.
[Test case]
Ran reproducer from comment #2.
[Regression potential]
We could break the use of cgroup bpf. The use of cgroup bpf looks to still be
working from the reproducer.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886860/+subscriptions
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