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