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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright 2020 Google LLC. */ #include "vmlinux.h" #include <errno.h> #include <bpf/bpf_core_read.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> #include "bpf_misc.h" struct { __uint(type, BPF_MAP_TYPE_ARRAY); __uint(max_entries, 1); __type(key, __u32); __type(value, __u64); } array SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 1); __type(key, __u32); __type(value, __u64); } hash SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_LRU_HASH); __uint(max_entries, 1); __type(key, __u32); __type(value, __u64); } lru_hash SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); __uint(max_entries, 1); __type(key, __u32); __type(value, __u64); } percpu_array SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_PERCPU_HASH); __uint(max_entries, 1); __type(key, __u32); __type(value, __u64); } percpu_hash SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_LRU_PERCPU_HASH); __uint(max_entries, 1); __type(key, __u32); __type(value, __u64); } lru_percpu_hash SEC(".maps"); struct inner_map { __uint(type, BPF_MAP_TYPE_ARRAY); __uint(max_entries, 1); __type(key, int); __type(value, __u64); } inner_map SEC(".maps"); struct outer_arr { __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS); __uint(max_entries, 1); __uint(key_size, sizeof(int)); __uint(value_size, sizeof(int)); __array(values, struct inner_map); } outer_arr SEC(".maps") = { .values = { [0] = &inner_map }, }; struct outer_hash { __uint(type, BPF_MAP_TYPE_HASH_OF_MAPS); __uint(max_entries, 1); __uint(key_size, sizeof(int)); __array(values, struct inner_map); } outer_hash SEC(".maps") = { .values = { [0] = &inner_map }, }; char _license[] SEC("license") = "GPL"; int monitored_pid = 0; int mprotect_count = 0; int bprm_count = 0; SEC("lsm/file_mprotect") int BPF_PROG(test_int_hook, struct vm_area_struct *vma, unsigned long reqprot, unsigned long prot, int ret) { if (ret != 0) return ret; __u32 pid = bpf_get_current_pid_tgid() >> 32; int is_stack = 0; is_stack = (vma->vm_start <= vma->vm_mm->start_stack && vma->vm_end >= vma->vm_mm->start_stack); if (is_stack && monitored_pid == pid) { mprotect_count++; ret = -EPERM; } return ret; } SEC("lsm.s/bprm_committed_creds") int BPF_PROG(test_void_hook, struct linux_binprm *bprm) { __u32 pid = bpf_get_current_pid_tgid() >> 32; struct inner_map *inner_map; char args[64]; __u32 key = 0; __u64 *value; if (monitored_pid == pid) bprm_count++; bpf_copy_from_user(args, sizeof(args), (void *)bprm->vma->vm_mm->arg_start); bpf_copy_from_user(args, sizeof(args), (void *)bprm->mm->arg_start); value = bpf_map_lookup_elem(&array, &key); if (value) *value = 0; value = bpf_map_lookup_elem(&hash, &key); if (value) *value = 0; value = bpf_map_lookup_elem(&lru_hash, &key); if (value) *value = 0; value = bpf_map_lookup_elem(&percpu_array, &key); if (value) *value = 0; value = bpf_map_lookup_elem(&percpu_hash, &key); if (value) *value = 0; value = bpf_map_lookup_elem(&lru_percpu_hash, &key); if (value) *value = 0; inner_map = bpf_map_lookup_elem(&outer_arr, &key); if (inner_map) { value = bpf_map_lookup_elem(inner_map, &key); if (value) *value = 0; } inner_map = bpf_map_lookup_elem(&outer_hash, &key); if (inner_map) { value = bpf_map_lookup_elem(inner_map, &key); if (value) *value = 0; } return 0; } SEC("lsm/task_free") /* lsm/ is ok, lsm.s/ fails */ int BPF_PROG(test_task_free, struct task_struct *task) { return 0; } int copy_test = 0; SEC("fentry.s/" SYS_PREFIX "sys_setdomainname") int BPF_PROG(test_sys_setdomainname, struct pt_regs *regs) { void *ptr = (void *)PT_REGS_PARM1_SYSCALL(regs); int len = PT_REGS_PARM2_SYSCALL(regs); int buf = 0; long ret; ret = bpf_copy_from_user(&buf, sizeof(buf), ptr); if (len == -2 && ret == 0 && buf == 1234) copy_test++; if (len == -3 && ret == -EFAULT) copy_test++; if (len == -4 && ret == -EFAULT) copy_test++; return 0; } |