// 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; __u32 one_task = 0; __u32 one_task_error = 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) { if (one_task) one_task_error = 1; 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; }