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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include "bpf_iter.h"
#include <bpf/bpf_helpers.h>
char _license[] SEC("license") = "GPL";
/* Copied from mm.h */
#define VM_READ 0x00000001
#define VM_WRITE 0x00000002
#define VM_EXEC 0x00000004
#define VM_MAYSHARE 0x00000080
/* Copied from kdev_t.h */
#define MINORBITS 20
#define MINORMASK ((1U << MINORBITS) - 1)
#define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS))
#define MINOR(dev) ((unsigned int) ((dev) & MINORMASK))
#define D_PATH_BUF_SIZE 1024
char d_path_buf[D_PATH_BUF_SIZE] = {};
__u32 pid = 0;
SEC("iter/task_vma") int proc_maps(struct bpf_iter__task_vma *ctx)
{
struct vm_area_struct *vma = ctx->vma;
struct seq_file *seq = ctx->meta->seq;
struct task_struct *task = ctx->task;
struct file *file;
char perm_str[] = "----";
if (task == (void *)0 || vma == (void *)0)
return 0;
file = vma->vm_file;
if (task->tgid != pid)
return 0;
perm_str[0] = (vma->vm_flags & VM_READ) ? 'r' : '-';
perm_str[1] = (vma->vm_flags & VM_WRITE) ? 'w' : '-';
perm_str[2] = (vma->vm_flags & VM_EXEC) ? 'x' : '-';
perm_str[3] = (vma->vm_flags & VM_MAYSHARE) ? 's' : 'p';
BPF_SEQ_PRINTF(seq, "%08llx-%08llx %s ", vma->vm_start, vma->vm_end, perm_str);
if (file) {
__u32 dev = file->f_inode->i_sb->s_dev;
bpf_d_path(&file->f_path, d_path_buf, D_PATH_BUF_SIZE);
BPF_SEQ_PRINTF(seq, "%08llx ", vma->vm_pgoff << 12);
BPF_SEQ_PRINTF(seq, "%02x:%02x %u", MAJOR(dev), MINOR(dev),
file->f_inode->i_ino);
BPF_SEQ_PRINTF(seq, "\t%s\n", d_path_buf);
} else {
BPF_SEQ_PRINTF(seq, "%08llx 00:00 0\n", 0ULL);
}
return 0;
}
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