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runc exec: use CLONE_INTO_CGROUP when available

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It makes sense to make runc exec benefit from clone2(CLONE_INTO_CGROUP),
if it is available. Since it requires a recent kernel and might not work,
implement a fallback to older way of joining the cgroup.

Based on:
 - https://go-review.googlesource.com/c/go/+/417695
 - https://github.com/coreos/go-systemd/pull/458
 - https://github.com/opencontainers/cgroups/pull/26
 - https://github.com/opencontainers/runc/pull/4822

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This commit is contained in:
Kir Kolyshkin
2025-07-15 16:31:49 -07:00
parent 7d81b21c1a
commit 5af4dd4e64
2 changed files with 63 additions and 2 deletions
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tests/integration/exec.bats
+1 -1
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@@ -282,7 +282,7 @@ function check_exec_debug() {
# Check we can't join non-existing subcgroup.
runc exec --cgroup nonexistent test_busybox cat /proc/self/cgroup
[ "$status" -ne 0 ]
[[ "$output" == *" adding pid "*"o such file or directory"* ]]
[[ "$output" == *" cgroup"*"o such file or directory"* ]]
# Check we can join top-level cgroup (implicit).
runc exec test_busybox grep '^0::/$' /proc/self/cgroup