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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023 Chuyi Zhou <zhouchuyi@bytedance.com> */
#include "vmlinux.h"
#include <errno.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#include "bpf_experimental.h"
char _license[] SEC("license") = "GPL";
struct cgroup *bpf_cgroup_acquire(struct cgroup *p) __ksym;
struct cgroup *bpf_cgroup_from_id(u64 cgid) __ksym;
void bpf_cgroup_release(struct cgroup *p) __ksym;
pid_t target_pid;
int css_task_cnt;
u64 cg_id;
SEC("lsm/file_mprotect")
int BPF_PROG(iter_css_task_for_each, struct vm_area_struct *vma,
unsigned long reqprot, unsigned long prot, int ret)
{
struct task_struct *cur_task = bpf_get_current_task_btf();
struct cgroup_subsys_state *css;
struct task_struct *task;
struct cgroup *cgrp;
if (cur_task->pid != target_pid)
return ret;
cgrp = bpf_cgroup_from_id(cg_id);
if (!cgrp)
return -EPERM;
css = &cgrp->self;
css_task_cnt = 0;
bpf_for_each(css_task, task, css, CSS_TASK_ITER_PROCS)
if (task->pid == target_pid)
css_task_cnt++;
bpf_cgroup_release(cgrp);
return -EPERM;
}
static inline u64 cgroup_id(struct cgroup *cgrp)
{
return cgrp->kn->id;
}
SEC("?iter/cgroup")
int cgroup_id_printer(struct bpf_iter__cgroup *ctx)
{
struct seq_file *seq = ctx->meta->seq;
struct cgroup *cgrp = ctx->cgroup;
struct cgroup_subsys_state *css;
struct task_struct *task;
/* epilogue */
if (cgrp == NULL) {
BPF_SEQ_PRINTF(seq, "epilogue\n");
return 0;
}
/* prologue */
if (ctx->meta->seq_num == 0)
BPF_SEQ_PRINTF(seq, "prologue\n");
BPF_SEQ_PRINTF(seq, "%8llu\n", cgroup_id(cgrp));
css = &cgrp->self;
css_task_cnt = 0;
bpf_for_each(css_task, task, css, CSS_TASK_ITER_PROCS) {
if (task->pid == target_pid)
css_task_cnt++;
}
return 0;
}
SEC("?fentry.s/" SYS_PREFIX "sys_getpgid")
int BPF_PROG(iter_css_task_for_each_sleep)
{
u64 cgrp_id = bpf_get_current_cgroup_id();
struct cgroup *cgrp = bpf_cgroup_from_id(cgrp_id);
struct cgroup_subsys_state *css;
struct task_struct *task;
if (cgrp == NULL)
return 0;
css = &cgrp->self;
bpf_for_each(css_task, task, css, CSS_TASK_ITER_PROCS) {
}
bpf_cgroup_release(cgrp);
return 0;
}
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