diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/iters_css_task.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/iters_css_task.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/iters_css_task.c b/tools/testing/selftests/bpf/progs/iters_css_task.c new file mode 100644 index 0000000000..9ac758649c --- /dev/null +++ b/tools/testing/selftests/bpf/progs/iters_css_task.c @@ -0,0 +1,102 @@ +// 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; +} |