63 lines · c
1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2020 Facebook */3#include "bpf_iter.h"4#include <bpf/bpf_helpers.h>5 6char _license[] SEC("license") = "GPL";7 8/* Copied from mm.h */9#define VM_READ 0x0000000110#define VM_WRITE 0x0000000211#define VM_EXEC 0x0000000412#define VM_MAYSHARE 0x0000008013 14/* Copied from kdev_t.h */15#define MINORBITS 2016#define MINORMASK ((1U << MINORBITS) - 1)17#define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS))18#define MINOR(dev) ((unsigned int) ((dev) & MINORMASK))19 20#define D_PATH_BUF_SIZE 102421char d_path_buf[D_PATH_BUF_SIZE] = {};22__u32 pid = 0;23__u32 one_task = 0;24__u32 one_task_error = 0;25 26SEC("iter/task_vma") int proc_maps(struct bpf_iter__task_vma *ctx)27{28 struct vm_area_struct *vma = ctx->vma;29 struct seq_file *seq = ctx->meta->seq;30 struct task_struct *task = ctx->task;31 struct file *file;32 char perm_str[] = "----";33 34 if (task == (void *)0 || vma == (void *)0)35 return 0;36 37 file = vma->vm_file;38 if (task->tgid != (pid_t)pid) {39 if (one_task)40 one_task_error = 1;41 return 0;42 }43 perm_str[0] = (vma->vm_flags & VM_READ) ? 'r' : '-';44 perm_str[1] = (vma->vm_flags & VM_WRITE) ? 'w' : '-';45 perm_str[2] = (vma->vm_flags & VM_EXEC) ? 'x' : '-';46 perm_str[3] = (vma->vm_flags & VM_MAYSHARE) ? 's' : 'p';47 BPF_SEQ_PRINTF(seq, "%08llx-%08llx %s ", vma->vm_start, vma->vm_end, perm_str);48 49 if (file) {50 __u32 dev = file->f_inode->i_sb->s_dev;51 52 bpf_d_path(&file->f_path, d_path_buf, D_PATH_BUF_SIZE);53 54 BPF_SEQ_PRINTF(seq, "%08llx ", vma->vm_pgoff << 12);55 BPF_SEQ_PRINTF(seq, "%02x:%02x %u", MAJOR(dev), MINOR(dev),56 file->f_inode->i_ino);57 BPF_SEQ_PRINTF(seq, "\t%s\n", d_path_buf);58 } else {59 BPF_SEQ_PRINTF(seq, "%08llx 00:00 0\n", 0ULL);60 }61 return 0;62}63