Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
KP Singh | 768 | 82.23% | 6 | 54.55% |
Martin KaFai Lau | 123 | 13.17% | 2 | 18.18% |
Alexei Starovoitov | 25 | 2.68% | 2 | 18.18% |
Joanne Koong | 18 | 1.93% | 1 | 9.09% |
Total | 934 | 11 |
// SPDX-License-Identifier: GPL-2.0 /* * Copyright 2020 Google LLC. */ #include "vmlinux.h" #include <errno.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> char _license[] SEC("license") = "GPL"; #define DUMMY_STORAGE_VALUE 0xdeadbeef __u32 monitored_pid = 0; int inode_storage_result = -1; int sk_storage_result = -1; int task_storage_result = -1; struct local_storage { struct inode *exec_inode; __u32 value; }; struct { __uint(type, BPF_MAP_TYPE_INODE_STORAGE); __uint(map_flags, BPF_F_NO_PREALLOC); __type(key, int); __type(value, struct local_storage); } inode_storage_map SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_SK_STORAGE); __uint(map_flags, BPF_F_NO_PREALLOC | BPF_F_CLONE); __type(key, int); __type(value, struct local_storage); } sk_storage_map SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_SK_STORAGE); __uint(map_flags, BPF_F_NO_PREALLOC | BPF_F_CLONE); __type(key, int); __type(value, struct local_storage); } sk_storage_map2 SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_TASK_STORAGE); __uint(map_flags, BPF_F_NO_PREALLOC); __type(key, int); __type(value, struct local_storage); } task_storage_map SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_TASK_STORAGE); __uint(map_flags, BPF_F_NO_PREALLOC); __type(key, int); __type(value, struct local_storage); } task_storage_map2 SEC(".maps"); SEC("lsm/inode_unlink") int BPF_PROG(unlink_hook, struct inode *dir, struct dentry *victim) { __u32 pid = bpf_get_current_pid_tgid() >> 32; struct bpf_local_storage *local_storage; struct local_storage *storage; struct task_struct *task; bool is_self_unlink; if (pid != monitored_pid) return 0; task = bpf_get_current_task_btf(); if (!task) return 0; task_storage_result = -1; storage = bpf_task_storage_get(&task_storage_map, task, 0, 0); if (!storage) return 0; /* Don't let an executable delete itself */ is_self_unlink = storage->exec_inode == victim->d_inode; storage = bpf_task_storage_get(&task_storage_map2, task, 0, BPF_LOCAL_STORAGE_GET_F_CREATE); if (!storage || storage->value) return 0; if (bpf_task_storage_delete(&task_storage_map, task)) return 0; /* Ensure that the task_storage_map is disconnected from the storage. * The storage memory should not be freed back to the * bpf_mem_alloc. */ local_storage = task->bpf_storage; if (!local_storage || local_storage->smap) return 0; task_storage_result = 0; return is_self_unlink ? -EPERM : 0; } SEC("lsm.s/inode_rename") int BPF_PROG(inode_rename, struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry, unsigned int flags) { struct local_storage *storage; int err; /* new_dentry->d_inode can be NULL when the inode is renamed to a file * that did not exist before. The helper should be able to handle this * NULL pointer. */ bpf_inode_storage_get(&inode_storage_map, new_dentry->d_inode, 0, BPF_LOCAL_STORAGE_GET_F_CREATE); storage = bpf_inode_storage_get(&inode_storage_map, old_dentry->d_inode, 0, 0); if (!storage) return 0; if (storage->value != DUMMY_STORAGE_VALUE) inode_storage_result = -1; err = bpf_inode_storage_delete(&inode_storage_map, old_dentry->d_inode); if (!err) inode_storage_result = err; return 0; } SEC("lsm.s/socket_bind") int BPF_PROG(socket_bind, struct socket *sock, struct sockaddr *address, int addrlen) { __u32 pid = bpf_get_current_pid_tgid() >> 32; struct local_storage *storage; struct sock *sk = sock->sk; if (pid != monitored_pid || !sk) return 0; storage = bpf_sk_storage_get(&sk_storage_map, sk, 0, 0); if (!storage) return 0; sk_storage_result = -1; if (storage->value != DUMMY_STORAGE_VALUE) return 0; /* This tests that we can associate multiple elements * with the local storage. */ storage = bpf_sk_storage_get(&sk_storage_map2, sk, 0, BPF_LOCAL_STORAGE_GET_F_CREATE); if (!storage) return 0; if (bpf_sk_storage_delete(&sk_storage_map2, sk)) return 0; storage = bpf_sk_storage_get(&sk_storage_map2, sk, 0, BPF_LOCAL_STORAGE_GET_F_CREATE); if (!storage) return 0; if (bpf_sk_storage_delete(&sk_storage_map, sk)) return 0; /* Ensure that the sk_storage_map is disconnected from the storage. */ if (!sk->sk_bpf_storage || sk->sk_bpf_storage->smap) return 0; sk_storage_result = 0; return 0; } SEC("lsm.s/socket_post_create") int BPF_PROG(socket_post_create, struct socket *sock, int family, int type, int protocol, int kern) { __u32 pid = bpf_get_current_pid_tgid() >> 32; struct local_storage *storage; struct sock *sk = sock->sk; if (pid != monitored_pid || !sk) return 0; storage = bpf_sk_storage_get(&sk_storage_map, sk, 0, BPF_LOCAL_STORAGE_GET_F_CREATE); if (!storage) return 0; storage->value = DUMMY_STORAGE_VALUE; return 0; } /* This uses the local storage to remember the inode of the binary that a * process was originally executing. */ SEC("lsm.s/bprm_committed_creds") void BPF_PROG(exec, struct linux_binprm *bprm) { __u32 pid = bpf_get_current_pid_tgid() >> 32; struct local_storage *storage; if (pid != monitored_pid) return; storage = bpf_task_storage_get(&task_storage_map, bpf_get_current_task_btf(), 0, BPF_LOCAL_STORAGE_GET_F_CREATE); if (storage) storage->exec_inode = bprm->file->f_inode; storage = bpf_inode_storage_get(&inode_storage_map, bprm->file->f_inode, 0, BPF_LOCAL_STORAGE_GET_F_CREATE); if (!storage) return; storage->value = DUMMY_STORAGE_VALUE; }
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