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/*
* Copyright (c) 2019 Yubico AB. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mutator_aux.h"
size_t LLVMFuzzerMutate(uint8_t *, size_t, size_t);
static uint8_t *wire_data_ptr = NULL;
static size_t wire_data_len = 0;
size_t
xstrlen(const char *s)
{
if (s == NULL)
return (0);
return (strlen(s));
}
void
consume(const void *body, size_t len)
{
const volatile uint8_t *ptr = body;
volatile uint8_t x = 0;
while (len--)
x ^= *ptr++;
}
void
consume_str(const char *str)
{
consume(str, strlen(str));
}
int
unpack_int(uint8_t t, uint8_t **ptr, size_t *len, int *v) NO_MSAN
{
size_t l;
if (*len < sizeof(t) || **ptr != t)
return (-1);
*ptr += sizeof(t);
*len -= sizeof(t);
if (*len < sizeof(l))
return (-1);
memcpy(&l, *ptr, sizeof(l));
*ptr += sizeof(l);
*len -= sizeof(l);
if (l != sizeof(*v) || *len < l)
return (-1);
memcpy(v, *ptr, sizeof(*v));
*ptr += sizeof(*v);
*len -= sizeof(*v);
return (0);
}
int
unpack_string(uint8_t t, uint8_t **ptr, size_t *len, char *v) NO_MSAN
{
size_t l;
if (*len < sizeof(t) || **ptr != t)
return (-1);
*ptr += sizeof(t);
*len -= sizeof(t);
if (*len < sizeof(l))
return (-1);
memcpy(&l, *ptr, sizeof(l));
*ptr += sizeof(l);
*len -= sizeof(l);
if (*len < l || l >= MAXSTR)
return (-1);
memcpy(v, *ptr, l);
v[l] = '\0';
*ptr += l;
*len -= l;
return (0);
}
int
unpack_byte(uint8_t t, uint8_t **ptr, size_t *len, uint8_t *v) NO_MSAN
{
size_t l;
if (*len < sizeof(t) || **ptr != t)
return (-1);
*ptr += sizeof(t);
*len -= sizeof(t);
if (*len < sizeof(l))
return (-1);
memcpy(&l, *ptr, sizeof(l));
*ptr += sizeof(l);
*len -= sizeof(l);
if (l != sizeof(*v) || *len < l)
return (-1);
memcpy(v, *ptr, sizeof(*v));
*ptr += sizeof(*v);
*len -= sizeof(*v);
return (0);
}
int
unpack_blob(uint8_t t, uint8_t **ptr, size_t *len, struct blob *v) NO_MSAN
{
size_t l;
v->len = 0;
if (*len < sizeof(t) || **ptr != t)
return (-1);
*ptr += sizeof(t);
*len -= sizeof(t);
if (*len < sizeof(l))
return (-1);
memcpy(&l, *ptr, sizeof(l));
*ptr += sizeof(l);
*len -= sizeof(l);
if (*len < l || l > sizeof(v->body))
return (-1);
memcpy(v->body, *ptr, l);
*ptr += l;
*len -= l;
v->len = l;
return (0);
}
int
pack_int(uint8_t t, uint8_t **ptr, size_t *len, int v) NO_MSAN
{
const size_t l = sizeof(v);
if (*len < sizeof(t) + sizeof(l) + l)
return (-1);
(*ptr)[0] = t;
memcpy(&(*ptr)[sizeof(t)], &l, sizeof(l));
memcpy(&(*ptr)[sizeof(t) + sizeof(l)], &v, l);
*ptr += sizeof(t) + sizeof(l) + l;
*len -= sizeof(t) + sizeof(l) + l;
return (0);
}
int
pack_string(uint8_t t, uint8_t **ptr, size_t *len, const char *v) NO_MSAN
{
const size_t l = strlen(v);
if (*len < sizeof(t) + sizeof(l) + l)
return (-1);
(*ptr)[0] = t;
memcpy(&(*ptr)[sizeof(t)], &l, sizeof(l));
memcpy(&(*ptr)[sizeof(t) + sizeof(l)], v, l);
*ptr += sizeof(t) + sizeof(l) + l;
*len -= sizeof(t) + sizeof(l) + l;
return (0);
}
int
pack_byte(uint8_t t, uint8_t **ptr, size_t *len, uint8_t v) NO_MSAN
{
const size_t l = sizeof(v);
if (*len < sizeof(t) + sizeof(l) + l)
return (-1);
(*ptr)[0] = t;
memcpy(&(*ptr)[sizeof(t)], &l, sizeof(l));
memcpy(&(*ptr)[sizeof(t) + sizeof(l)], &v, l);
*ptr += sizeof(t) + sizeof(l) + l;
*len -= sizeof(t) + sizeof(l) + l;
return (0);
}
int
pack_blob(uint8_t t, uint8_t **ptr, size_t *len, const struct blob *v) NO_MSAN
{
const size_t l = v->len;
if (*len < sizeof(t) + sizeof(l) + l)
return (-1);
(*ptr)[0] = t;
memcpy(&(*ptr)[sizeof(t)], &l, sizeof(l));
memcpy(&(*ptr)[sizeof(t) + sizeof(l)], v->body, l);
*ptr += sizeof(t) + sizeof(l) + l;
*len -= sizeof(t) + sizeof(l) + l;
return (0);
}
size_t
len_int(void)
{
return (sizeof(uint8_t) + sizeof(size_t) + sizeof(int));
}
size_t
len_string(int max)
{
return ((sizeof(uint8_t) + sizeof(size_t)) + (max ? MAXSTR - 1 : 0));
}
size_t
len_byte(void)
{
return (sizeof(uint8_t) + sizeof(size_t) + sizeof(uint8_t));
}
size_t
len_blob(int max)
{
return (sizeof(uint8_t) + sizeof(size_t) + (max ? MAXBLOB : 0));
}
void
mutate_byte(uint8_t *b)
{
LLVMFuzzerMutate(b, sizeof(*b), sizeof(*b));
}
void
mutate_int(int *i)
{
LLVMFuzzerMutate((uint8_t *)i, sizeof(*i), sizeof(*i));
}
void
mutate_blob(struct blob *blob)
{
blob->len = LLVMFuzzerMutate((uint8_t *)blob->body, blob->len,
sizeof(blob->body));
}
void
mutate_string(char *s)
{
size_t n;
n = LLVMFuzzerMutate((uint8_t *)s, strlen(s), MAXSTR - 1);
s[n] = '\0';
}
void *
dev_open(const char *path)
{
(void)path;
return ((void *)0xdeadbeef);
}
void
dev_close(void *handle)
{
assert(handle == (void *)0xdeadbeef);
}
int
dev_read(void *handle, unsigned char *ptr, size_t len, int ms)
{
size_t n;
(void)ms;
assert(handle == (void *)0xdeadbeef);
assert(len == 64);
if (wire_data_len < len)
n = wire_data_len;
else
n = len;
memcpy(ptr, wire_data_ptr, n);
wire_data_ptr += n;
wire_data_len -= n;
return ((int)n);
}
int
dev_write(void *handle, const unsigned char *ptr, size_t len)
{
assert(handle == (void *)0xdeadbeef);
assert(len == 64 + 1);
consume(ptr, len);
if (uniform_random(400) < 1)
return (-1);
return ((int)len);
}
void
set_wire_data(uint8_t *ptr, size_t len)
{
wire_data_ptr = ptr;
wire_data_len = len;
}
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