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