145b38941SDave Marchevsky // SPDX-License-Identifier: GPL-2.0
245b38941SDave Marchevsky /* Copyright (c) 2020 Facebook */
345b38941SDave Marchevsky #include "bpf_iter.h"
445b38941SDave Marchevsky #include <bpf/bpf_helpers.h>
545b38941SDave Marchevsky
645b38941SDave Marchevsky char _license[] SEC("license") = "GPL";
745b38941SDave Marchevsky
845b38941SDave Marchevsky /* Copied from mm.h */
945b38941SDave Marchevsky #define VM_READ 0x00000001
1045b38941SDave Marchevsky #define VM_WRITE 0x00000002
1145b38941SDave Marchevsky #define VM_EXEC 0x00000004
1245b38941SDave Marchevsky #define VM_MAYSHARE 0x00000080
1345b38941SDave Marchevsky
1445b38941SDave Marchevsky /* Copied from kdev_t.h */
1545b38941SDave Marchevsky #define MINORBITS 20
1645b38941SDave Marchevsky #define MINORMASK ((1U << MINORBITS) - 1)
1745b38941SDave Marchevsky #define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS))
1845b38941SDave Marchevsky #define MINOR(dev) ((unsigned int) ((dev) & MINORMASK))
1945b38941SDave Marchevsky
2045b38941SDave Marchevsky #define D_PATH_BUF_SIZE 1024
2145b38941SDave Marchevsky char d_path_buf[D_PATH_BUF_SIZE] = {};
2245b38941SDave Marchevsky __u32 pid = 0;
2345b38941SDave Marchevsky __u32 one_task = 0;
2445b38941SDave Marchevsky __u32 one_task_error = 0;
2545b38941SDave Marchevsky
proc_maps(struct bpf_iter__task_vma * ctx)2645b38941SDave Marchevsky SEC("iter/task_vma") int proc_maps(struct bpf_iter__task_vma *ctx)
2745b38941SDave Marchevsky {
2845b38941SDave Marchevsky struct vm_area_struct *vma = ctx->vma;
2945b38941SDave Marchevsky struct seq_file *seq = ctx->meta->seq;
3045b38941SDave Marchevsky struct task_struct *task = ctx->task;
3145b38941SDave Marchevsky struct file *file;
3245b38941SDave Marchevsky char perm_str[] = "----";
3345b38941SDave Marchevsky
3445b38941SDave Marchevsky if (task == (void *)0 || vma == (void *)0)
3545b38941SDave Marchevsky return 0;
3645b38941SDave Marchevsky
3745b38941SDave Marchevsky file = vma->vm_file;
38*495d2d81SAlexei Starovoitov if (task->tgid != (pid_t)pid) {
3945b38941SDave Marchevsky if (one_task)
4045b38941SDave Marchevsky one_task_error = 1;
4145b38941SDave Marchevsky return 0;
4245b38941SDave Marchevsky }
4345b38941SDave Marchevsky perm_str[0] = (vma->vm_flags & VM_READ) ? 'r' : '-';
4445b38941SDave Marchevsky perm_str[1] = (vma->vm_flags & VM_WRITE) ? 'w' : '-';
4545b38941SDave Marchevsky perm_str[2] = (vma->vm_flags & VM_EXEC) ? 'x' : '-';
4645b38941SDave Marchevsky perm_str[3] = (vma->vm_flags & VM_MAYSHARE) ? 's' : 'p';
4745b38941SDave Marchevsky BPF_SEQ_PRINTF(seq, "%08llx-%08llx %s ", vma->vm_start, vma->vm_end, perm_str);
4845b38941SDave Marchevsky
4945b38941SDave Marchevsky if (file) {
5045b38941SDave Marchevsky __u32 dev = file->f_inode->i_sb->s_dev;
5145b38941SDave Marchevsky
5245b38941SDave Marchevsky bpf_d_path(&file->f_path, d_path_buf, D_PATH_BUF_SIZE);
5345b38941SDave Marchevsky
5445b38941SDave Marchevsky BPF_SEQ_PRINTF(seq, "%08llx ", vma->vm_pgoff << 12);
5545b38941SDave Marchevsky BPF_SEQ_PRINTF(seq, "%02x:%02x %u", MAJOR(dev), MINOR(dev),
5645b38941SDave Marchevsky file->f_inode->i_ino);
5745b38941SDave Marchevsky BPF_SEQ_PRINTF(seq, "\t%s\n", d_path_buf);
5845b38941SDave Marchevsky } else {
5945b38941SDave Marchevsky BPF_SEQ_PRINTF(seq, "%08llx 00:00 0\n", 0ULL);
6045b38941SDave Marchevsky }
6145b38941SDave Marchevsky return 0;
6245b38941SDave Marchevsky }
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