360769233c
Add selftests for cgroup1 hierarchy. The result as follows, $ tools/testing/selftests/bpf/test_progs --name=cgroup1_hierarchy #36/1 cgroup1_hierarchy/test_cgroup1_hierarchy:OK #36/2 cgroup1_hierarchy/test_root_cgid:OK #36/3 cgroup1_hierarchy/test_invalid_level:OK #36/4 cgroup1_hierarchy/test_invalid_cgid:OK #36/5 cgroup1_hierarchy/test_invalid_hid:OK #36/6 cgroup1_hierarchy/test_invalid_cgrp_name:OK #36/7 cgroup1_hierarchy/test_invalid_cgrp_name2:OK #36/8 cgroup1_hierarchy/test_sleepable_prog:OK #36 cgroup1_hierarchy:OK Summary: 1/8 PASSED, 0 SKIPPED, 0 FAILED Besides, I also did some stress test similar to the patch #2 in this series, as follows (with CONFIG_PROVE_RCU_LIST enabled): - Continuously mounting and unmounting named cgroups in some tasks, for example: cgrp_name=$1 while true do mount -t cgroup -o none,name=$cgrp_name none /$cgrp_name umount /$cgrp_name done - Continuously run this selftest concurrently, while true; do ./test_progs --name=cgroup1_hierarchy; done They can ran successfully without any RCU warnings in dmesg. Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Link: https://lore.kernel.org/r/20231111090034.4248-7-laoar.shao@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (C) 2023 Yafang Shao <laoar.shao@gmail.com> */
|
|
|
|
#include "vmlinux.h"
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
#include <bpf/bpf_core_read.h>
|
|
|
|
__u32 target_ancestor_level;
|
|
__u64 target_ancestor_cgid;
|
|
int target_pid, target_hid;
|
|
|
|
struct cgroup *bpf_task_get_cgroup1(struct task_struct *task, int hierarchy_id) __ksym;
|
|
struct cgroup *bpf_cgroup_ancestor(struct cgroup *cgrp, int level) __ksym;
|
|
void bpf_cgroup_release(struct cgroup *cgrp) __ksym;
|
|
|
|
static int bpf_link_create_verify(int cmd)
|
|
{
|
|
struct cgroup *cgrp, *ancestor;
|
|
struct task_struct *task;
|
|
int ret = 0;
|
|
|
|
if (cmd != BPF_LINK_CREATE)
|
|
return 0;
|
|
|
|
task = bpf_get_current_task_btf();
|
|
|
|
/* Then it can run in parallel with others */
|
|
if (task->pid != target_pid)
|
|
return 0;
|
|
|
|
cgrp = bpf_task_get_cgroup1(task, target_hid);
|
|
if (!cgrp)
|
|
return 0;
|
|
|
|
/* Refuse it if its cgid or its ancestor's cgid is the target cgid */
|
|
if (cgrp->kn->id == target_ancestor_cgid)
|
|
ret = -1;
|
|
|
|
ancestor = bpf_cgroup_ancestor(cgrp, target_ancestor_level);
|
|
if (!ancestor)
|
|
goto out;
|
|
|
|
if (ancestor->kn->id == target_ancestor_cgid)
|
|
ret = -1;
|
|
bpf_cgroup_release(ancestor);
|
|
|
|
out:
|
|
bpf_cgroup_release(cgrp);
|
|
return ret;
|
|
}
|
|
|
|
SEC("lsm/bpf")
|
|
int BPF_PROG(lsm_run, int cmd, union bpf_attr *attr, unsigned int size)
|
|
{
|
|
return bpf_link_create_verify(cmd);
|
|
}
|
|
|
|
SEC("lsm.s/bpf")
|
|
int BPF_PROG(lsm_s_run, int cmd, union bpf_attr *attr, unsigned int size)
|
|
{
|
|
return bpf_link_create_verify(cmd);
|
|
}
|
|
|
|
SEC("fentry")
|
|
int BPF_PROG(fentry_run)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|