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fuzz: add more fuzz tests

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From: Hiromasa Ito <v3hertz@gmail.com>

See bugs #57374-#57380 found by this new test mode.
This commit is contained in:
Simon Goldschmidt
2020-02-19 21:12:37 +01:00
parent a07e0a82c9
commit d05be56a50
8 changed files with 464 additions and 35 deletions
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431
test/fuzz/fuzz_common.c
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@@ -33,9 +33,13 @@
#include "fuzz_common.h"
#include "lwip/altcp_tcp.h"
#include "lwip/dns.h"
#include "lwip/init.h"
#include "lwip/netif.h"
#include "lwip/dns.h"
#include "lwip/sys.h"
#include "lwip/timeouts.h"
#include "lwip/udp.h"
#include "netif/etharp.h"
#if LWIP_IPV6
#include "lwip/ethip6.h"
@@ -50,14 +54,13 @@
#include <string.h>
#include <stdio.h>
/* This define enables multi packet processing.
* For this, the input is interpreted as 2 byte length + data + 2 byte length + data...
* #define LWIP_FUZZ_MULTI_PACKET
*/
#ifdef LWIP_FUZZ_MULTI_PACKET
u8_t pktbuf[20000];
#else
u8_t pktbuf[2000];
static u8_t pktbuf[200000];
static const u8_t *remfuzz_ptr; /* remaining fuzz pointer */
static size_t remfuzz_len; /* remaining fuzz length */
#ifdef LWIP_FUZZ_SYS_NOW
/* This offset should be added to the time 'sys_now()' returns */
u32_t sys_now_offset;
#endif
/* no-op send function */
@@ -106,6 +109,8 @@ static void input_pkt(struct netif *netif, const u8_t *data, size_t len)
MEMCPY(q->payload, data, q->len);
data += q->len;
}
remfuzz_ptr += len;
remfuzz_len -= len;
err = netif->input(p, netif);
if (err != ERR_OK) {
pbuf_free(p);
@@ -114,39 +119,367 @@ static void input_pkt(struct netif *netif, const u8_t *data, size_t len)
static void input_pkts(enum lwip_fuzz_type type, struct netif *netif, const u8_t *data, size_t len)
{
remfuzz_ptr = data;
remfuzz_len = len;
if (type == LWIP_FUZZ_SINGLE) {
input_pkt(netif, data, len);
} else {
const u16_t max_packet_size = 1514;
const u8_t *ptr = data;
size_t rem_len = len;
const size_t minlen = sizeof(u16_t) + (type == LWIP_FUZZ_MULTIPACKET_TIME ? sizeof(u32_t) : 0);
while (rem_len > sizeof(u16_t)) {
while (remfuzz_len > minlen) {
u16_t frame_len;
memcpy(&frame_len, ptr, sizeof(u16_t));
ptr += sizeof(u16_t);
rem_len -= sizeof(u16_t);
#ifdef LWIP_FUZZ_SYS_NOW
u32_t external_delay = 0;
#endif
if (type == LWIP_FUZZ_MULTIPACKET_TIME) {
#ifdef LWIP_FUZZ_SYS_NOW
/* Extract external delay time from fuzz pool */
memcpy(&external_delay, remfuzz_ptr, sizeof(u32_t));
external_delay = htonl(external_delay);
#endif
remfuzz_ptr += sizeof(u32_t);
remfuzz_len -= sizeof(u32_t);
}
memcpy(&frame_len, remfuzz_ptr, sizeof(u16_t));
remfuzz_ptr += sizeof(u16_t);
remfuzz_len -= sizeof(u16_t);
frame_len = htons(frame_len) & 0x7FF;
frame_len = LWIP_MIN(frame_len, max_packet_size);
if (frame_len > rem_len) {
frame_len = (u16_t)rem_len;
if (frame_len > remfuzz_len) {
frame_len = (u16_t)remfuzz_len;
}
if (frame_len != 0) {
input_pkt(netif, ptr, frame_len);
if (type == LWIP_FUZZ_MULTIPACKET_TIME) {
#ifdef LWIP_FUZZ_SYS_NOW
/* Update total external delay time, and check timeouts */
sys_now_offset += external_delay;
#endif
sys_check_timeouts();
}
input_pkt(netif, remfuzz_ptr, frame_len);
/* Check timeouts again */
sys_check_timeouts();
}
ptr += frame_len;
rem_len -= frame_len;
}
}
}
int lwip_fuzztest(int argc, char** argv, enum lwip_fuzz_type type)
#if LWIP_TCP
static struct altcp_pcb *tcp_client_pcb; /* a pcb for the TCP client */
static struct altcp_pcb *tcp_server_pcb; /* a pcb for the TCP server */
static u16_t tcp_remote_port; /* a TCP port number of the destionation */
static u16_t tcp_local_port; /* a TCP port number of the local server */
/**
* tcp_app_fuzz_input
* Input fuzz with a write function for TCP.
*/
static void
tcp_app_fuzz_input(struct altcp_pcb *pcb)
{
if (remfuzz_len > sizeof(u16_t)) {
/*
* (max IP packet size) - ((minimum IP header size) + (minimum TCP header size))
* = 65535 - (20 + 20)
* = 65495
*/
const u16_t max_data_size = 65495;
u16_t data_len;
memcpy(&data_len, remfuzz_ptr, sizeof(u16_t));
remfuzz_ptr += sizeof(u16_t);
remfuzz_len -= sizeof(u16_t);
data_len = htons(data_len);
data_len = LWIP_MIN(data_len, max_data_size);
if (data_len > remfuzz_len) {
data_len = (u16_t)remfuzz_len;
}
if (data_len != 0) {
altcp_write(pcb, remfuzz_ptr, data_len, TCP_WRITE_FLAG_COPY);
altcp_output(pcb);
} else {
altcp_close(pcb);
}
remfuzz_ptr += data_len;
remfuzz_len -= data_len;
}
}
/**
* tcp_client_connected
* A connected callback function (for the TCP client)
*/
static err_t
tcp_client_connected(void *arg, struct altcp_pcb *pcb, err_t err)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(err);
tcp_app_fuzz_input(pcb);
return ERR_OK;
}
/**
* tcp_client_recv
* A recv callback function (for the TCP client)
*/
static err_t
tcp_client_recv(void *arg, struct altcp_pcb *pcb, struct pbuf *p, err_t err)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(err);
if (p == NULL) {
altcp_close(pcb);
} else {
altcp_recved(pcb, p->tot_len);
tcp_app_fuzz_input(pcb);
pbuf_free(p);
}
return ERR_OK;
}
/**
* tcp_client_sent
* A sent callback function (for the TCP client)
*/
static err_t
tcp_client_sent(void *arg, struct altcp_pcb *pcb, u16_t len)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(pcb);
LWIP_UNUSED_ARG(len);
return ERR_OK;
}
/**
* tcp_client_poll
* A poll callback function (for the TCP client)
*/
static err_t
tcp_client_poll(void *arg, struct altcp_pcb *pcb)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(pcb);
return ERR_OK;
}
/**
* tcp_client_err
* An err callback function (for the TCP client)
*/
static void
tcp_client_err(void *arg, err_t err)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(err);
}
/**
* tcp_server_recv
* A recv callback function (for the TCP server)
*/
static err_t
tcp_server_recv(void *arg, struct altcp_pcb *pcb, struct pbuf *p, err_t err)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(err);
if (p == NULL) {
altcp_close(pcb);
} else {
altcp_recved(pcb, p->tot_len);
tcp_app_fuzz_input(pcb);
pbuf_free(p);
}
return ERR_OK;
}
/**
* tcp_server_sent
* A sent callback function (for the TCP server)
*/
static err_t
tcp_server_sent(void *arg, struct altcp_pcb *pcb, u16_t len)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(pcb);
LWIP_UNUSED_ARG(len);
return ERR_OK;
}
/**
* tcp_server_poll
* A poll callback function (for the TCP server)
*/
static err_t
tcp_server_poll(void *arg, struct altcp_pcb *pcb)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(pcb);
return ERR_OK;
}
/**
* tcp_server_err
* An err callbuck function (for the TCP server)
*/
static void
tcp_server_err(void *arg, err_t err)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(err);
}
/**
* tcp_server_accept
* An accept callbuck function (for the TCP server)
*/
static err_t
tcp_server_accept(void *arg, struct altcp_pcb *pcb, err_t err)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(err);
if ((err != ERR_OK) || (pcb == NULL)) {
return ERR_VAL;
}
altcp_setprio(pcb, TCP_PRIO_MIN);
altcp_recv(pcb, tcp_server_recv);
altcp_err(pcb, tcp_server_err);
altcp_poll(pcb, tcp_server_poll, 10);
altcp_sent(pcb, tcp_server_sent);
return ERR_OK;
}
#endif /* LWIP_TCP */
#if LWIP_UDP
static struct udp_pcb *udp_client_pcb; /* a pcb for the UDP client */
static struct udp_pcb *udp_server_pcb; /* a pcb for the UDP server */
static u16_t udp_remote_port; /* a UDP port number of the destination */
static u16_t udp_local_port; /* a UDP port number of the local server*/
/**
* udp_app_fuzz_input
* Input fuzz with write functions for UDP.
*/
static void
udp_app_fuzz_input(struct udp_pcb *pcb, const ip_addr_t *addr, u16_t port)
{
if (remfuzz_len > sizeof(u16_t)) {
/*
* (max IP packet size) - ((minimum IP header size) - (minimum UDP header size))
* = 65535 - (20 + 8)
* = 65507
*/
const u16_t max_data_size = 65507;
u16_t data_len;
memcpy(&data_len, remfuzz_ptr, sizeof(u16_t));
remfuzz_ptr += sizeof(u16_t);
remfuzz_len -= sizeof(u16_t);
data_len = htons(data_len);
data_len = LWIP_MIN(data_len, max_data_size);
if (data_len > remfuzz_len) {
data_len = (u16_t)remfuzz_len;
}
if (data_len != 0) {
struct pbuf *p, *q;
p = pbuf_alloc(PBUF_RAW, (u16_t)data_len, PBUF_POOL);
LWIP_ASSERT("alloc failed", p);
for (q = p; q != NULL; q = q->next) {
MEMCPY(q->payload, remfuzz_ptr, q->len);
remfuzz_ptr += q->len;
}
remfuzz_len -= data_len;
/*
* Trying input from ...
*
* client:
* The pcb has information about the destination.
* We use udp_send().
*
* server:
* The pcb does NOT have infomation about the destionation.
* We use udp_sendto().
*/
if (addr == NULL) {
udp_send(pcb, p);
} else {
udp_sendto(pcb, p, addr, port);
}
pbuf_free(p);
}
}
}
/**
* udp_client_recv
* A recv callback function (for the UDP client)
*/
static void
udp_client_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(p);
LWIP_UNUSED_ARG(addr);
LWIP_UNUSED_ARG(port);
if (p == NULL) {
udp_disconnect(pcb);
} else {
/*
* We call the function with 2nd argument set to NULL
* to input fuzz from udp_send.
*/
udp_app_fuzz_input(pcb, NULL, port);
pbuf_free(p);
}
}
/**
* udp_server_recv
* A recv callback functyion (for the UDP server)
*/
static void
udp_server_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(p);
LWIP_UNUSED_ARG(addr);
LWIP_UNUSED_ARG(port);
if (p != NULL) {
udp_app_fuzz_input(pcb, addr, port);
pbuf_free(p);
}
}
#endif /* LWIP_UDP */
int lwip_fuzztest(int argc, char** argv, enum lwip_fuzz_type type, u32_t test_apps)
{
struct netif net_test;
ip4_addr_t addr;
ip4_addr_t netmask;
ip4_addr_t gw;
size_t len;
err_t err;
ip_addr_t remote_addr; /* a IPv4 addr of the destination */
struct eth_addr remote_mac = ETH_ADDR(0x28, 0x00, 0x00, 0x22, 0x2b, 0x38); /* a MAC addr of the destination */
lwip_init();
@@ -158,17 +491,61 @@ int lwip_fuzztest(int argc, char** argv, enum lwip_fuzz_type type)
netif_set_up(&net_test);
netif_set_link_up(&net_test);
if (test_apps & LWIP_FUZZ_STATICARP) {
/* Add the ARP entry */
IP_ADDR4(&remote_addr, 172, 30, 115, 37);
etharp_add_static_entry(&(remote_addr.u_addr.ip4), &remote_mac);
}
#if LWIP_IPV6
nd6_tmr(); /* tick nd to join multicast groups */
#endif
dns_setserver(0, &net_test.gw);
/* initialize apps */
httpd_init();
lwiperf_start_tcp_server_default(NULL, NULL);
mdns_resp_init();
mdns_resp_add_netif(&net_test, "hostname");
snmp_init();
if (test_apps & LWIP_FUZZ_DEFAULT) {
/* initialize apps */
httpd_init();
lwiperf_start_tcp_server_default(NULL, NULL);
mdns_resp_init();
mdns_resp_add_netif(&net_test, "hostname");
snmp_init();
}
if (test_apps & LWIP_FUZZ_TCP_CLIENT) {
tcp_client_pcb = altcp_tcp_new_ip_type(IPADDR_TYPE_ANY);
LWIP_ASSERT("Error: altcp_new() failed", tcp_client_pcb != NULL);
tcp_remote_port = 80;
err = altcp_connect(tcp_client_pcb, &remote_addr, tcp_remote_port, tcp_client_connected);
LWIP_ASSERT("Error: altcp_connect() failed", err == ERR_OK);
altcp_recv(tcp_client_pcb, tcp_client_recv);
altcp_err(tcp_client_pcb, tcp_client_err);
altcp_poll(tcp_client_pcb, tcp_client_poll, 10);
altcp_sent(tcp_client_pcb, tcp_client_sent);
}
if (test_apps & LWIP_FUZZ_TCP_SERVER) {
tcp_server_pcb = altcp_tcp_new_ip_type(IPADDR_TYPE_ANY);
LWIP_ASSERT("Error: altcp_new() failed", tcp_server_pcb != NULL);
altcp_setprio(tcp_server_pcb, TCP_PRIO_MIN);
tcp_local_port = 80;
err = altcp_bind(tcp_server_pcb, IP_ANY_TYPE, tcp_local_port);
LWIP_ASSERT("Error: altcp_bind() failed", err == ERR_OK);
tcp_server_pcb = altcp_listen(tcp_server_pcb);
LWIP_ASSERT("Error: altcp_listen() failed", err == ERR_OK);
altcp_accept(tcp_server_pcb, tcp_server_accept);
}
if (test_apps & LWIP_FUZZ_UDP_CLIENT) {
udp_client_pcb = udp_new();
udp_new_ip_type(IPADDR_TYPE_ANY);
udp_recv(udp_client_pcb, udp_client_recv, NULL);
udp_remote_port = 161;
udp_connect(udp_client_pcb, &remote_addr, udp_remote_port);
}
if (test_apps & LWIP_FUZZ_UDP_SERVER) {
udp_server_pcb = udp_new();
udp_new_ip_type(IPADDR_TYPE_ANY);
udp_local_port = 161;
udp_bind(udp_server_pcb, IP_ANY_TYPE, udp_local_port);
udp_recv(udp_server_pcb, udp_server_recv, NULL);
}
if(argc > 1) {
FILE* f;