APPLIED [OEM-5.6] Re: [SRU B/D/E/F/focal:linux-oem-5.6 0/2] cgroup refcount is bogus when cgroup_sk_alloc is disabled
tjaalton at ubuntu.com
Wed Jul 29 12:10:55 UTC 2020
On 27.7.2020 16.28, Thadeu Lima de Souza Cascardo wrote:
> BugLink: https://bugs.launchpad.net/bugs/1886860
> This is a followup from LP: #1886668.
> 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.
> Cong Wang (2):
> cgroup: fix cgroup_sk_alloc() for sk_clone_lock()
> cgroup: Fix sock_cgroup_data on big-endian.
> include/linux/cgroup-defs.h | 8 ++++++--
> include/linux/cgroup.h | 4 +++-
> kernel/cgroup/cgroup.c | 29 ++++++++++++++++++-----------
> net/core/sock.c | 2 +-
> 4 files changed, 28 insertions(+), 15 deletions(-)
applied to oem-5.6, thanks
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