1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (c) 2020 Facebook */ |
3 | #include "bpf_iter.h" |
4 | #include <bpf/bpf_helpers.h> |
5 | |
6 | char _license[] SEC("license" ) = "GPL" ; |
7 | |
8 | /* Copied from mm.h */ |
9 | #define VM_READ 0x00000001 |
10 | #define VM_WRITE 0x00000002 |
11 | #define VM_EXEC 0x00000004 |
12 | #define VM_MAYSHARE 0x00000080 |
13 | |
14 | /* Copied from kdev_t.h */ |
15 | #define MINORBITS 20 |
16 | #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 1024 |
21 | char d_path_buf[D_PATH_BUF_SIZE] = {}; |
22 | __u32 pid = 0; |
23 | __u32 one_task = 0; |
24 | __u32 one_task_error = 0; |
25 | |
26 | SEC("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 | |