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d19ddb476a
Similar to btf_sock_ids, btf_tracing_ids provides btf ID for task_struct, file, and vm_area_struct via easy to understand format like btf_tracing_ids[BTF_TRACING_TYPE_[TASK|file|VMA]]. Suggested-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20211112150243.1270987-3-songliubraving@fb.com
671 lines
16 KiB
C
671 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2020 Facebook */
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#include <linux/init.h>
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#include <linux/namei.h>
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#include <linux/pid_namespace.h>
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#include <linux/fs.h>
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#include <linux/fdtable.h>
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#include <linux/filter.h>
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#include <linux/btf_ids.h>
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#include "mmap_unlock_work.h"
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struct bpf_iter_seq_task_common {
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struct pid_namespace *ns;
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};
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struct bpf_iter_seq_task_info {
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/* The first field must be struct bpf_iter_seq_task_common.
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* this is assumed by {init, fini}_seq_pidns() callback functions.
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*/
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struct bpf_iter_seq_task_common common;
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u32 tid;
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};
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static struct task_struct *task_seq_get_next(struct pid_namespace *ns,
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u32 *tid,
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bool skip_if_dup_files)
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{
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struct task_struct *task = NULL;
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struct pid *pid;
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rcu_read_lock();
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retry:
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pid = find_ge_pid(*tid, ns);
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if (pid) {
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*tid = pid_nr_ns(pid, ns);
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task = get_pid_task(pid, PIDTYPE_PID);
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if (!task) {
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++*tid;
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goto retry;
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} else if (skip_if_dup_files && !thread_group_leader(task) &&
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task->files == task->group_leader->files) {
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put_task_struct(task);
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task = NULL;
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++*tid;
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goto retry;
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}
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}
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rcu_read_unlock();
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return task;
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}
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static void *task_seq_start(struct seq_file *seq, loff_t *pos)
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{
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struct bpf_iter_seq_task_info *info = seq->private;
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struct task_struct *task;
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task = task_seq_get_next(info->common.ns, &info->tid, false);
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if (!task)
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return NULL;
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if (*pos == 0)
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++*pos;
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return task;
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}
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static void *task_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct bpf_iter_seq_task_info *info = seq->private;
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struct task_struct *task;
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++*pos;
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++info->tid;
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put_task_struct((struct task_struct *)v);
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task = task_seq_get_next(info->common.ns, &info->tid, false);
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if (!task)
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return NULL;
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return task;
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}
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struct bpf_iter__task {
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__bpf_md_ptr(struct bpf_iter_meta *, meta);
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__bpf_md_ptr(struct task_struct *, task);
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};
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DEFINE_BPF_ITER_FUNC(task, struct bpf_iter_meta *meta, struct task_struct *task)
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static int __task_seq_show(struct seq_file *seq, struct task_struct *task,
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bool in_stop)
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{
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struct bpf_iter_meta meta;
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struct bpf_iter__task ctx;
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struct bpf_prog *prog;
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meta.seq = seq;
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prog = bpf_iter_get_info(&meta, in_stop);
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if (!prog)
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return 0;
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meta.seq = seq;
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ctx.meta = &meta;
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ctx.task = task;
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return bpf_iter_run_prog(prog, &ctx);
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}
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static int task_seq_show(struct seq_file *seq, void *v)
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{
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return __task_seq_show(seq, v, false);
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}
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static void task_seq_stop(struct seq_file *seq, void *v)
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{
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if (!v)
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(void)__task_seq_show(seq, v, true);
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else
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put_task_struct((struct task_struct *)v);
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}
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static const struct seq_operations task_seq_ops = {
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.start = task_seq_start,
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.next = task_seq_next,
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.stop = task_seq_stop,
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.show = task_seq_show,
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};
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struct bpf_iter_seq_task_file_info {
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/* The first field must be struct bpf_iter_seq_task_common.
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* this is assumed by {init, fini}_seq_pidns() callback functions.
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*/
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struct bpf_iter_seq_task_common common;
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struct task_struct *task;
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u32 tid;
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u32 fd;
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};
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static struct file *
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task_file_seq_get_next(struct bpf_iter_seq_task_file_info *info)
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{
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struct pid_namespace *ns = info->common.ns;
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u32 curr_tid = info->tid;
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struct task_struct *curr_task;
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unsigned int curr_fd = info->fd;
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/* If this function returns a non-NULL file object,
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* it held a reference to the task/file.
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* Otherwise, it does not hold any reference.
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*/
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again:
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if (info->task) {
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curr_task = info->task;
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curr_fd = info->fd;
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} else {
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curr_task = task_seq_get_next(ns, &curr_tid, true);
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if (!curr_task) {
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info->task = NULL;
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info->tid = curr_tid;
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return NULL;
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}
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/* set info->task and info->tid */
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info->task = curr_task;
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if (curr_tid == info->tid) {
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curr_fd = info->fd;
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} else {
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info->tid = curr_tid;
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curr_fd = 0;
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}
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}
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rcu_read_lock();
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for (;; curr_fd++) {
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struct file *f;
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f = task_lookup_next_fd_rcu(curr_task, &curr_fd);
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if (!f)
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break;
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if (!get_file_rcu(f))
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continue;
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/* set info->fd */
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info->fd = curr_fd;
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rcu_read_unlock();
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return f;
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}
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/* the current task is done, go to the next task */
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rcu_read_unlock();
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put_task_struct(curr_task);
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info->task = NULL;
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info->fd = 0;
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curr_tid = ++(info->tid);
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goto again;
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}
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static void *task_file_seq_start(struct seq_file *seq, loff_t *pos)
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{
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struct bpf_iter_seq_task_file_info *info = seq->private;
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struct file *file;
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info->task = NULL;
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file = task_file_seq_get_next(info);
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if (file && *pos == 0)
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++*pos;
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return file;
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}
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static void *task_file_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct bpf_iter_seq_task_file_info *info = seq->private;
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++*pos;
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++info->fd;
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fput((struct file *)v);
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return task_file_seq_get_next(info);
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}
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struct bpf_iter__task_file {
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__bpf_md_ptr(struct bpf_iter_meta *, meta);
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__bpf_md_ptr(struct task_struct *, task);
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u32 fd __aligned(8);
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__bpf_md_ptr(struct file *, file);
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};
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DEFINE_BPF_ITER_FUNC(task_file, struct bpf_iter_meta *meta,
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struct task_struct *task, u32 fd,
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struct file *file)
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static int __task_file_seq_show(struct seq_file *seq, struct file *file,
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bool in_stop)
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{
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struct bpf_iter_seq_task_file_info *info = seq->private;
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struct bpf_iter__task_file ctx;
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struct bpf_iter_meta meta;
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struct bpf_prog *prog;
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meta.seq = seq;
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prog = bpf_iter_get_info(&meta, in_stop);
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if (!prog)
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return 0;
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ctx.meta = &meta;
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ctx.task = info->task;
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ctx.fd = info->fd;
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ctx.file = file;
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return bpf_iter_run_prog(prog, &ctx);
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}
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static int task_file_seq_show(struct seq_file *seq, void *v)
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{
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return __task_file_seq_show(seq, v, false);
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}
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static void task_file_seq_stop(struct seq_file *seq, void *v)
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{
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struct bpf_iter_seq_task_file_info *info = seq->private;
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if (!v) {
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(void)__task_file_seq_show(seq, v, true);
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} else {
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fput((struct file *)v);
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put_task_struct(info->task);
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info->task = NULL;
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}
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}
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static int init_seq_pidns(void *priv_data, struct bpf_iter_aux_info *aux)
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{
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struct bpf_iter_seq_task_common *common = priv_data;
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common->ns = get_pid_ns(task_active_pid_ns(current));
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return 0;
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}
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static void fini_seq_pidns(void *priv_data)
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{
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struct bpf_iter_seq_task_common *common = priv_data;
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put_pid_ns(common->ns);
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}
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static const struct seq_operations task_file_seq_ops = {
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.start = task_file_seq_start,
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.next = task_file_seq_next,
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.stop = task_file_seq_stop,
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.show = task_file_seq_show,
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};
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struct bpf_iter_seq_task_vma_info {
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/* The first field must be struct bpf_iter_seq_task_common.
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* this is assumed by {init, fini}_seq_pidns() callback functions.
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*/
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struct bpf_iter_seq_task_common common;
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struct task_struct *task;
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struct vm_area_struct *vma;
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u32 tid;
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unsigned long prev_vm_start;
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unsigned long prev_vm_end;
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};
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enum bpf_task_vma_iter_find_op {
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task_vma_iter_first_vma, /* use mm->mmap */
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task_vma_iter_next_vma, /* use curr_vma->vm_next */
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task_vma_iter_find_vma, /* use find_vma() to find next vma */
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};
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static struct vm_area_struct *
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task_vma_seq_get_next(struct bpf_iter_seq_task_vma_info *info)
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{
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struct pid_namespace *ns = info->common.ns;
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enum bpf_task_vma_iter_find_op op;
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struct vm_area_struct *curr_vma;
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struct task_struct *curr_task;
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u32 curr_tid = info->tid;
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/* If this function returns a non-NULL vma, it holds a reference to
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* the task_struct, and holds read lock on vma->mm->mmap_lock.
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* If this function returns NULL, it does not hold any reference or
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* lock.
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*/
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if (info->task) {
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curr_task = info->task;
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curr_vma = info->vma;
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/* In case of lock contention, drop mmap_lock to unblock
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* the writer.
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*
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* After relock, call find(mm, prev_vm_end - 1) to find
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* new vma to process.
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*
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* +------+------+-----------+
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* | VMA1 | VMA2 | VMA3 |
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* +------+------+-----------+
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* | | | |
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* 4k 8k 16k 400k
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*
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* For example, curr_vma == VMA2. Before unlock, we set
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*
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* prev_vm_start = 8k
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* prev_vm_end = 16k
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*
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* There are a few cases:
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*
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* 1) VMA2 is freed, but VMA3 exists.
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*
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* find_vma() will return VMA3, just process VMA3.
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*
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* 2) VMA2 still exists.
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*
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* find_vma() will return VMA2, process VMA2->next.
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*
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* 3) no more vma in this mm.
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*
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* Process the next task.
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*
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* 4) find_vma() returns a different vma, VMA2'.
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*
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* 4.1) If VMA2 covers same range as VMA2', skip VMA2',
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* because we already covered the range;
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* 4.2) VMA2 and VMA2' covers different ranges, process
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* VMA2'.
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*/
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if (mmap_lock_is_contended(curr_task->mm)) {
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info->prev_vm_start = curr_vma->vm_start;
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info->prev_vm_end = curr_vma->vm_end;
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op = task_vma_iter_find_vma;
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mmap_read_unlock(curr_task->mm);
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if (mmap_read_lock_killable(curr_task->mm))
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goto finish;
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} else {
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op = task_vma_iter_next_vma;
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}
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} else {
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again:
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curr_task = task_seq_get_next(ns, &curr_tid, true);
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if (!curr_task) {
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info->tid = curr_tid + 1;
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goto finish;
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}
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if (curr_tid != info->tid) {
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info->tid = curr_tid;
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/* new task, process the first vma */
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op = task_vma_iter_first_vma;
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} else {
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/* Found the same tid, which means the user space
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* finished data in previous buffer and read more.
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* We dropped mmap_lock before returning to user
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* space, so it is necessary to use find_vma() to
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* find the next vma to process.
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*/
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op = task_vma_iter_find_vma;
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}
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if (!curr_task->mm)
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goto next_task;
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if (mmap_read_lock_killable(curr_task->mm))
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goto finish;
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}
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switch (op) {
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case task_vma_iter_first_vma:
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curr_vma = curr_task->mm->mmap;
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break;
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case task_vma_iter_next_vma:
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curr_vma = curr_vma->vm_next;
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break;
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case task_vma_iter_find_vma:
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/* We dropped mmap_lock so it is necessary to use find_vma
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* to find the next vma. This is similar to the mechanism
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* in show_smaps_rollup().
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*/
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curr_vma = find_vma(curr_task->mm, info->prev_vm_end - 1);
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/* case 1) and 4.2) above just use curr_vma */
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/* check for case 2) or case 4.1) above */
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if (curr_vma &&
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curr_vma->vm_start == info->prev_vm_start &&
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curr_vma->vm_end == info->prev_vm_end)
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curr_vma = curr_vma->vm_next;
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break;
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}
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if (!curr_vma) {
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/* case 3) above, or case 2) 4.1) with vma->next == NULL */
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mmap_read_unlock(curr_task->mm);
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goto next_task;
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}
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info->task = curr_task;
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info->vma = curr_vma;
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return curr_vma;
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next_task:
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put_task_struct(curr_task);
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info->task = NULL;
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curr_tid++;
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goto again;
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finish:
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if (curr_task)
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put_task_struct(curr_task);
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info->task = NULL;
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info->vma = NULL;
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return NULL;
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}
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static void *task_vma_seq_start(struct seq_file *seq, loff_t *pos)
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{
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struct bpf_iter_seq_task_vma_info *info = seq->private;
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struct vm_area_struct *vma;
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vma = task_vma_seq_get_next(info);
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if (vma && *pos == 0)
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++*pos;
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return vma;
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}
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static void *task_vma_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct bpf_iter_seq_task_vma_info *info = seq->private;
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++*pos;
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return task_vma_seq_get_next(info);
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}
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struct bpf_iter__task_vma {
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__bpf_md_ptr(struct bpf_iter_meta *, meta);
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__bpf_md_ptr(struct task_struct *, task);
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__bpf_md_ptr(struct vm_area_struct *, vma);
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};
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DEFINE_BPF_ITER_FUNC(task_vma, struct bpf_iter_meta *meta,
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struct task_struct *task, struct vm_area_struct *vma)
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static int __task_vma_seq_show(struct seq_file *seq, bool in_stop)
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{
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struct bpf_iter_seq_task_vma_info *info = seq->private;
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struct bpf_iter__task_vma ctx;
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struct bpf_iter_meta meta;
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struct bpf_prog *prog;
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meta.seq = seq;
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prog = bpf_iter_get_info(&meta, in_stop);
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if (!prog)
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return 0;
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ctx.meta = &meta;
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ctx.task = info->task;
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ctx.vma = info->vma;
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return bpf_iter_run_prog(prog, &ctx);
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}
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static int task_vma_seq_show(struct seq_file *seq, void *v)
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{
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return __task_vma_seq_show(seq, false);
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}
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static void task_vma_seq_stop(struct seq_file *seq, void *v)
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{
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struct bpf_iter_seq_task_vma_info *info = seq->private;
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if (!v) {
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(void)__task_vma_seq_show(seq, true);
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} else {
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/* info->vma has not been seen by the BPF program. If the
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* user space reads more, task_vma_seq_get_next should
|
|
* return this vma again. Set prev_vm_start to ~0UL,
|
|
* so that we don't skip the vma returned by the next
|
|
* find_vma() (case task_vma_iter_find_vma in
|
|
* task_vma_seq_get_next()).
|
|
*/
|
|
info->prev_vm_start = ~0UL;
|
|
info->prev_vm_end = info->vma->vm_end;
|
|
mmap_read_unlock(info->task->mm);
|
|
put_task_struct(info->task);
|
|
info->task = NULL;
|
|
}
|
|
}
|
|
|
|
static const struct seq_operations task_vma_seq_ops = {
|
|
.start = task_vma_seq_start,
|
|
.next = task_vma_seq_next,
|
|
.stop = task_vma_seq_stop,
|
|
.show = task_vma_seq_show,
|
|
};
|
|
|
|
static const struct bpf_iter_seq_info task_seq_info = {
|
|
.seq_ops = &task_seq_ops,
|
|
.init_seq_private = init_seq_pidns,
|
|
.fini_seq_private = fini_seq_pidns,
|
|
.seq_priv_size = sizeof(struct bpf_iter_seq_task_info),
|
|
};
|
|
|
|
static struct bpf_iter_reg task_reg_info = {
|
|
.target = "task",
|
|
.feature = BPF_ITER_RESCHED,
|
|
.ctx_arg_info_size = 1,
|
|
.ctx_arg_info = {
|
|
{ offsetof(struct bpf_iter__task, task),
|
|
PTR_TO_BTF_ID_OR_NULL },
|
|
},
|
|
.seq_info = &task_seq_info,
|
|
};
|
|
|
|
static const struct bpf_iter_seq_info task_file_seq_info = {
|
|
.seq_ops = &task_file_seq_ops,
|
|
.init_seq_private = init_seq_pidns,
|
|
.fini_seq_private = fini_seq_pidns,
|
|
.seq_priv_size = sizeof(struct bpf_iter_seq_task_file_info),
|
|
};
|
|
|
|
static struct bpf_iter_reg task_file_reg_info = {
|
|
.target = "task_file",
|
|
.feature = BPF_ITER_RESCHED,
|
|
.ctx_arg_info_size = 2,
|
|
.ctx_arg_info = {
|
|
{ offsetof(struct bpf_iter__task_file, task),
|
|
PTR_TO_BTF_ID_OR_NULL },
|
|
{ offsetof(struct bpf_iter__task_file, file),
|
|
PTR_TO_BTF_ID_OR_NULL },
|
|
},
|
|
.seq_info = &task_file_seq_info,
|
|
};
|
|
|
|
static const struct bpf_iter_seq_info task_vma_seq_info = {
|
|
.seq_ops = &task_vma_seq_ops,
|
|
.init_seq_private = init_seq_pidns,
|
|
.fini_seq_private = fini_seq_pidns,
|
|
.seq_priv_size = sizeof(struct bpf_iter_seq_task_vma_info),
|
|
};
|
|
|
|
static struct bpf_iter_reg task_vma_reg_info = {
|
|
.target = "task_vma",
|
|
.feature = BPF_ITER_RESCHED,
|
|
.ctx_arg_info_size = 2,
|
|
.ctx_arg_info = {
|
|
{ offsetof(struct bpf_iter__task_vma, task),
|
|
PTR_TO_BTF_ID_OR_NULL },
|
|
{ offsetof(struct bpf_iter__task_vma, vma),
|
|
PTR_TO_BTF_ID_OR_NULL },
|
|
},
|
|
.seq_info = &task_vma_seq_info,
|
|
};
|
|
|
|
BPF_CALL_5(bpf_find_vma, struct task_struct *, task, u64, start,
|
|
bpf_callback_t, callback_fn, void *, callback_ctx, u64, flags)
|
|
{
|
|
struct mmap_unlock_irq_work *work = NULL;
|
|
struct vm_area_struct *vma;
|
|
bool irq_work_busy = false;
|
|
struct mm_struct *mm;
|
|
int ret = -ENOENT;
|
|
|
|
if (flags)
|
|
return -EINVAL;
|
|
|
|
if (!task)
|
|
return -ENOENT;
|
|
|
|
mm = task->mm;
|
|
if (!mm)
|
|
return -ENOENT;
|
|
|
|
irq_work_busy = bpf_mmap_unlock_get_irq_work(&work);
|
|
|
|
if (irq_work_busy || !mmap_read_trylock(mm))
|
|
return -EBUSY;
|
|
|
|
vma = find_vma(mm, start);
|
|
|
|
if (vma && vma->vm_start <= start && vma->vm_end > start) {
|
|
callback_fn((u64)(long)task, (u64)(long)vma,
|
|
(u64)(long)callback_ctx, 0, 0);
|
|
ret = 0;
|
|
}
|
|
bpf_mmap_unlock_mm(work, mm);
|
|
return ret;
|
|
}
|
|
|
|
const struct bpf_func_proto bpf_find_vma_proto = {
|
|
.func = bpf_find_vma,
|
|
.ret_type = RET_INTEGER,
|
|
.arg1_type = ARG_PTR_TO_BTF_ID,
|
|
.arg1_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK],
|
|
.arg2_type = ARG_ANYTHING,
|
|
.arg3_type = ARG_PTR_TO_FUNC,
|
|
.arg4_type = ARG_PTR_TO_STACK_OR_NULL,
|
|
.arg5_type = ARG_ANYTHING,
|
|
};
|
|
|
|
DEFINE_PER_CPU(struct mmap_unlock_irq_work, mmap_unlock_work);
|
|
|
|
static void do_mmap_read_unlock(struct irq_work *entry)
|
|
{
|
|
struct mmap_unlock_irq_work *work;
|
|
|
|
if (WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_RT)))
|
|
return;
|
|
|
|
work = container_of(entry, struct mmap_unlock_irq_work, irq_work);
|
|
mmap_read_unlock_non_owner(work->mm);
|
|
}
|
|
|
|
static int __init task_iter_init(void)
|
|
{
|
|
struct mmap_unlock_irq_work *work;
|
|
int ret, cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
work = per_cpu_ptr(&mmap_unlock_work, cpu);
|
|
init_irq_work(&work->irq_work, do_mmap_read_unlock);
|
|
}
|
|
|
|
task_reg_info.ctx_arg_info[0].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_TASK];
|
|
ret = bpf_iter_reg_target(&task_reg_info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
task_file_reg_info.ctx_arg_info[0].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_TASK];
|
|
task_file_reg_info.ctx_arg_info[1].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_FILE];
|
|
ret = bpf_iter_reg_target(&task_file_reg_info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
task_vma_reg_info.ctx_arg_info[0].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_TASK];
|
|
task_vma_reg_info.ctx_arg_info[1].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_VMA];
|
|
return bpf_iter_reg_target(&task_vma_reg_info);
|
|
}
|
|
late_initcall(task_iter_init);
|