Bump oc/cgroups to v0.0.9, improve sub-cgroup checks - #5403
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See https://github.com/opencontainers/cgroups/releases/tag/v0.0.9 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
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Because of opencontainers/cgroups#69 I want to backport this to at least 1.5 but maybe also 1.4. I mean, a buffer overrun from the kernel is no joke. |
The check that a sub-cgroup path (as set by runc exec --cgroup, or libcontainer's Process.SubCgroupPaths) does not escape the container's cgroup was too lax: a plain prefix check also accepts a sibling cgroup whose name starts with the container cgroup name (say, "../foo-suffix" for a container cgroup named "foo"). For addIntoCgroupV1 (used for per-controller sub-cgroup paths, which AddPid does not support) the resulting path is passed to WriteCgroupProc as is, so the pid did end up in the sibling cgroup. For prepareCgroupFD the subsequent cgroups.OpenFile call cleans the path, so nothing escaped in practice, but the check was wrong nevertheless. Use the same check as opencontainers/cgroups v0.0.9 does in AddPid, and add test cases for both code paths. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This was referenced Aug 17, 2026
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For oc/cgroups v0.0.9 release notes, see https://github.com/opencontainers/cgroups/releases/tag/v0.0.9