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common_linux.h
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// Copyright 2016 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
// This file is shared between executor and csource package.
#include <stdlib.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
#if SYZ_EXECUTOR
const int kExtraCoverSize = 1024 << 10;
struct cover_t;
static void cover_reset(cover_t* cov);
#endif
#if SYZ_EXECUTOR || SYZ_THREADED
#include <linux/futex.h>
#include <pthread.h>
typedef struct {
int state;
} event_t;
static void event_init(event_t* ev)
{
ev->state = 0;
}
static void event_reset(event_t* ev)
{
ev->state = 0;
}
static void event_set(event_t* ev)
{
if (ev->state)
exitf("event already set");
__atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}
static void event_wait(event_t* ev)
{
while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}
static int event_isset(event_t* ev)
{
return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}
static int event_timedwait(event_t* ev, uint64 timeout)
{
uint64 start = current_time_ms();
uint64 now = start;
for (;;) {
uint64 remain = timeout - (now - start);
struct timespec ts;
ts.tv_sec = remain / 1000;
ts.tv_nsec = (remain % 1000) * 1000 * 1000;
syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
return 1;
now = current_time_ms();
if (now - start > timeout)
return 0;
}
}
#endif
#if SYZ_EXECUTOR || SYZ_REPEAT || SYZ_NET_INJECTION || SYZ_FAULT || SYZ_SANDBOX_NONE || \
SYZ_SANDBOX_SETUID || SYZ_SANDBOX_NAMESPACE || SYZ_SANDBOX_ANDROID || \
SYZ_FAULT || SYZ_LEAK || SYZ_BINFMT_MISC || SYZ_SYSCTL || \
((__NR_syz_usb_connect || __NR_syz_usb_connect_ath9k) && USB_DEBUG) || \
__NR_syz_usbip_server_init
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
static bool write_file(const char* file, const char* what, ...)
{
char buf[1024];
va_list args;
va_start(args, what);
vsnprintf(buf, sizeof(buf), what, args);
va_end(args);
buf[sizeof(buf) - 1] = 0;
int len = strlen(buf);
int fd = open(file, O_WRONLY | O_CLOEXEC);
if (fd == -1)
return false;
if (write(fd, buf, len) != len) {
int err = errno;
close(fd);
debug("write(%s) failed: %d\n", file, err);
errno = err;
return false;
}
close(fd);
return true;
}
#endif
#if SYZ_EXECUTOR || SYZ_NET_DEVICES || SYZ_NET_INJECTION || SYZ_DEVLINK_PCI || SYZ_WIFI || SYZ_802154 || \
__NR_syz_genetlink_get_family_id || __NR_syz_80211_inject_frame || __NR_syz_80211_join_ibss || SYZ_NIC_VF
#include <arpa/inet.h>
#include <errno.h>
#include <net/if.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <linux/genetlink.h>
#include <linux/if_addr.h>
#include <linux/if_link.h>
#include <linux/in6.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/veth.h>
struct nlmsg {
char* pos;
int nesting;
struct nlattr* nested[8];
char buf[4096];
};
static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
const void* data, int size)
{
memset(nlmsg, 0, sizeof(*nlmsg));
struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
hdr->nlmsg_type = typ;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
memcpy(hdr + 1, data, size);
nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
}
static void netlink_attr(struct nlmsg* nlmsg, int typ,
const void* data, int size)
{
struct nlattr* attr = (struct nlattr*)nlmsg->pos;
attr->nla_len = sizeof(*attr) + size;
attr->nla_type = typ;
if (size > 0)
memcpy(attr + 1, data, size);
nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}
#if SYZ_EXECUTOR || SYZ_NET_DEVICES || SYZ_802154
static void netlink_nest(struct nlmsg* nlmsg, int typ)
{
struct nlattr* attr = (struct nlattr*)nlmsg->pos;
attr->nla_type = typ;
nlmsg->pos += sizeof(*attr);
nlmsg->nested[nlmsg->nesting++] = attr;
}
static void netlink_done(struct nlmsg* nlmsg)
{
struct nlattr* attr = nlmsg->nested[--nlmsg->nesting];
attr->nla_len = nlmsg->pos - (char*)attr;
}
#if SYZ_EXECUTOR || SYZ_NIC_VF
#include <ifaddrs.h>
#include <linux/ethtool.h>
#include <linux/sockios.h>
#include <sys/ioctl.h>
struct vf_intf {
char pass_thru_intf[IFNAMSIZ];
int ppid; // used by Child
};
static struct vf_intf vf_intf;
static void find_vf_interface(void)
{
#if SYZ_EXECUTOR
if (!flag_nic_vf)
return;
#endif
struct ifaddrs* addresses = NULL;
int pid = getpid();
int ret = 0;
memset(&vf_intf, 0, sizeof(struct vf_intf));
debug("Checking for VF pass-thru interface.\n");
if (getifaddrs(&addresses) == -1) {
debug("%s: getifaddrs() failed.\n", __func__);
return;
}
int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (fd < 0) {
debug("%s: socket() failed.\n", __func__);
return;
}
struct ifreq ifr;
struct ethtool_drvinfo drvinfo;
struct ifaddrs* address = addresses;
while (address) {
debug("ifa_name: %s\n", address->ifa_name);
memset(&ifr, 0, sizeof(struct ifreq));
strcpy(ifr.ifr_name, address->ifa_name);
memset(&drvinfo, 0, sizeof(struct ethtool_drvinfo));
drvinfo.cmd = ETHTOOL_GDRVINFO;
ifr.ifr_data = (caddr_t)&drvinfo;
ret = ioctl(fd, SIOCETHTOOL, &ifr);
if (ret < 0) {
debug("%s: ioctl() failed.\n", __func__);
} else if (strlen(drvinfo.bus_info)) {
debug("bus_info: %s, strlen(drvinfo.bus_info)=%zu\n",
drvinfo.bus_info, strlen(drvinfo.bus_info));
if (strcmp(drvinfo.bus_info, "0000:00:11.0") == 0) {
if (strlen(address->ifa_name) < IFNAMSIZ) {
strncpy(vf_intf.pass_thru_intf,
address->ifa_name, IFNAMSIZ);
vf_intf.ppid = pid;
} else {
debug("%s: %d strlen(%s) >= IFNAMSIZ.\n",
__func__, pid, address->ifa_name);
}
break;
}
}
address = address->ifa_next;
}
freeifaddrs(addresses);
if (!vf_intf.ppid) {
memset(&vf_intf, 0, sizeof(struct vf_intf));
debug("%s: %d could not find VF pass-thru interface.\n", __func__, pid);
return;
}
debug("%s: %d found VF pass-thru interface %s\n",
__func__, pid, vf_intf.pass_thru_intf);
}
#endif // SYZ_NIC_VF
#endif
static int netlink_send_ext(struct nlmsg* nlmsg, int sock,
uint16 reply_type, int* reply_len, bool dofail)
{
#if SYZ_EXECUTOR
if (in_execute_one && dofail) {
// We can expect different sorts of breakages during fuzzing,
// we should not kill the whole process because of them.
failmsg("invalid netlink_send_ext arguments", "dofail is true during syscall execution");
}
#endif
if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
fail("nlmsg overflow/bad nesting");
struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
struct sockaddr_nl addr;
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0, (struct sockaddr*)&addr, sizeof(addr));
if (n != (ssize_t)hdr->nlmsg_len) {
if (dofail)
failmsg("netlink_send_ext: short netlink write", "wrote=%zd, want=%d", n, hdr->nlmsg_len);
debug("netlink_send_ext: short netlink write: %zd/%d errno=%d\n", n, hdr->nlmsg_len, errno);
return -1;
}
n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
if (reply_len)
*reply_len = 0;
if (n < 0) {
if (dofail)
fail("netlink_send_ext: netlink read failed");
debug("netlink_send_ext: netlink read failed: errno=%d\n", errno);
return -1;
}
if (n < (ssize_t)sizeof(struct nlmsghdr)) {
errno = EINVAL;
if (dofail)
failmsg("netlink_send_ext: short netlink read", "read=%zd", n);
debug("netlink_send_ext: short netlink read: %zd\n", n);
return -1;
}
if (hdr->nlmsg_type == NLMSG_DONE)
return 0;
if (reply_len && hdr->nlmsg_type == reply_type) {
*reply_len = n;
return 0;
}
if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) {
errno = EINVAL;
if (dofail)
failmsg("netlink_send_ext: short netlink read", "read=%zd", n);
debug("netlink_send_ext: short netlink read: %zd\n", n);
return -1;
}
if (hdr->nlmsg_type != NLMSG_ERROR) {
errno = EINVAL;
if (dofail)
failmsg("netlink_send_ext: bad netlink ack type", "type=%d", hdr->nlmsg_type);
debug("netlink_send_ext: short netlink ack: %d\n", hdr->nlmsg_type);
return -1;
}
errno = -((struct nlmsgerr*)(hdr + 1))->error;
return -errno;
}
#if SYZ_EXECUTOR || SYZ_NET_DEVICES || SYZ_NET_INJECTION || SYZ_DEVLINK_PCI || SYZ_WIFI || SYZ_802154
static int netlink_send(struct nlmsg* nlmsg, int sock)
{
return netlink_send_ext(nlmsg, sock, 0, NULL, true);
}
#endif
static int netlink_query_family_id(struct nlmsg* nlmsg, int sock, const char* family_name, bool dofail)
{
struct genlmsghdr genlhdr;
memset(&genlhdr, 0, sizeof(genlhdr));
genlhdr.cmd = CTRL_CMD_GETFAMILY;
netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name, strnlen(family_name, GENL_NAMSIZ - 1) + 1);
int n = 0;
int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail);
if (err < 0) {
debug("netlink: failed to get family id for %.*s: %s\n", GENL_NAMSIZ, family_name, strerror(errno));
return -1;
}
uint16 id = 0;
struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(genlhdr)));
for (; (char*)attr < nlmsg->buf + n; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
id = *(uint16*)(attr + 1);
break;
}
}
if (!id) {
debug("netlink: failed to parse family id for %.*s\n", GENL_NAMSIZ, family_name);
errno = EINVAL;
return -1;
}
recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); // recv ack
return id;
}
#if SYZ_EXECUTOR || SYZ_NET_DEVICES || SYZ_DEVLINK_PCI
static int netlink_next_msg(struct nlmsg* nlmsg, unsigned int offset,
unsigned int total_len)
{
struct nlmsghdr* hdr = (struct nlmsghdr*)(nlmsg->buf + offset);
if (offset == total_len || offset + hdr->nlmsg_len > total_len)
return -1;
return hdr->nlmsg_len;
}
#endif
#if SYZ_EXECUTOR || SYZ_NET_DEVICES || SYZ_802154
static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
const char* name, bool up)
{
struct ifinfomsg hdr;
memset(&hdr, 0, sizeof(hdr));
if (up)
hdr.ifi_flags = hdr.ifi_change = IFF_UP;
netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr));
if (name)
netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name));
netlink_nest(nlmsg, IFLA_LINKINFO);
netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type));
}
#endif
#if SYZ_EXECUTOR || SYZ_NET_DEVICES
static void netlink_add_device(struct nlmsg* nlmsg, int sock, const char* type,
const char* name)
{
netlink_add_device_impl(nlmsg, type, name, false);
netlink_done(nlmsg);
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: adding device %s type %s: %s\n", name, type, strerror(errno));
}
}
static void netlink_add_veth(struct nlmsg* nlmsg, int sock, const char* name,
const char* peer)
{
netlink_add_device_impl(nlmsg, "veth", name, false);
netlink_nest(nlmsg, IFLA_INFO_DATA);
netlink_nest(nlmsg, VETH_INFO_PEER);
nlmsg->pos += sizeof(struct ifinfomsg);
netlink_attr(nlmsg, IFLA_IFNAME, peer, strlen(peer));
netlink_done(nlmsg);
netlink_done(nlmsg);
netlink_done(nlmsg);
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: adding device %s type veth peer %s: %s\n", name, peer, strerror(errno));
}
}
static void netlink_add_xfrm(struct nlmsg* nlmsg, int sock, const char* name)
{
netlink_add_device_impl(nlmsg, "xfrm", name, true);
netlink_nest(nlmsg, IFLA_INFO_DATA);
int if_id = 1;
// This is IFLA_XFRM_IF_ID attr which is not present in older kernel headers.
netlink_attr(nlmsg, 2, &if_id, sizeof(if_id));
netlink_done(nlmsg);
netlink_done(nlmsg);
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: adding device %s type xfrm if_id %d: %s\n", name, if_id, strerror(errno));
}
}
static void netlink_add_hsr(struct nlmsg* nlmsg, int sock, const char* name,
const char* slave1, const char* slave2)
{
netlink_add_device_impl(nlmsg, "hsr", name, false);
netlink_nest(nlmsg, IFLA_INFO_DATA);
int ifindex1 = if_nametoindex(slave1);
netlink_attr(nlmsg, IFLA_HSR_SLAVE1, &ifindex1, sizeof(ifindex1));
int ifindex2 = if_nametoindex(slave2);
netlink_attr(nlmsg, IFLA_HSR_SLAVE2, &ifindex2, sizeof(ifindex2));
netlink_done(nlmsg);
netlink_done(nlmsg);
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: adding device %s type hsr slave1 %s slave2 %s: %s\n", name, slave1, slave2, strerror(errno));
}
}
static void netlink_add_linked(struct nlmsg* nlmsg, int sock, const char* type, const char* name, const char* link)
{
netlink_add_device_impl(nlmsg, type, name, false);
netlink_done(nlmsg);
int ifindex = if_nametoindex(link);
netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: adding device %s type %s link %s: %s\n", name, type, link, strerror(errno));
}
}
static void netlink_add_vlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link, uint16 id, uint16 proto)
{
netlink_add_device_impl(nlmsg, "vlan", name, false);
netlink_nest(nlmsg, IFLA_INFO_DATA);
netlink_attr(nlmsg, IFLA_VLAN_ID, &id, sizeof(id));
netlink_attr(nlmsg, IFLA_VLAN_PROTOCOL, &proto, sizeof(proto));
netlink_done(nlmsg);
netlink_done(nlmsg);
int ifindex = if_nametoindex(link);
netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: add %s type vlan link %s id %d: %s\n", name, link, id, strerror(errno));
}
}
static void netlink_add_macvlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link)
{
netlink_add_device_impl(nlmsg, "macvlan", name, false);
netlink_nest(nlmsg, IFLA_INFO_DATA);
uint32 mode = MACVLAN_MODE_BRIDGE;
netlink_attr(nlmsg, IFLA_MACVLAN_MODE, &mode, sizeof(mode));
netlink_done(nlmsg);
netlink_done(nlmsg);
int ifindex = if_nametoindex(link);
netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: add %s type macvlan link %s mode %d: %s\n", name, link, mode, strerror(errno));
}
}
static void netlink_add_geneve(struct nlmsg* nlmsg, int sock, const char* name, uint32 vni, struct in_addr* addr4, struct in6_addr* addr6)
{
netlink_add_device_impl(nlmsg, "geneve", name, false);
netlink_nest(nlmsg, IFLA_INFO_DATA);
netlink_attr(nlmsg, IFLA_GENEVE_ID, &vni, sizeof(vni));
if (addr4)
netlink_attr(nlmsg, IFLA_GENEVE_REMOTE, addr4, sizeof(*addr4));
if (addr6)
netlink_attr(nlmsg, IFLA_GENEVE_REMOTE6, addr6, sizeof(*addr6));
netlink_done(nlmsg);
netlink_done(nlmsg);
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: add %s type geneve vni %u: %s\n", name, vni, strerror(errno));
}
}
#define IFLA_IPVLAN_FLAGS 2
#define IPVLAN_MODE_L3S 2
#undef IPVLAN_F_VEPA
#define IPVLAN_F_VEPA 2
static void netlink_add_ipvlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link, uint16 mode, uint16 flags)
{
netlink_add_device_impl(nlmsg, "ipvlan", name, false);
netlink_nest(nlmsg, IFLA_INFO_DATA);
netlink_attr(nlmsg, IFLA_IPVLAN_MODE, &mode, sizeof(mode));
netlink_attr(nlmsg, IFLA_IPVLAN_FLAGS, &flags, sizeof(flags));
netlink_done(nlmsg);
netlink_done(nlmsg);
int ifindex = if_nametoindex(link);
netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: add %s type ipvlan link %s mode %d: %s\n", name, link, mode, strerror(errno));
}
}
#endif
#if SYZ_EXECUTOR || SYZ_NET_DEVICES || SYZ_NET_INJECTION || SYZ_DEVLINK_PCI || SYZ_802154
static void netlink_device_change(struct nlmsg* nlmsg, int sock, const char* name, bool up,
const char* master, const void* mac, int macsize,
const char* new_name)
{
struct ifinfomsg hdr;
memset(&hdr, 0, sizeof(hdr));
if (up)
hdr.ifi_flags = hdr.ifi_change = IFF_UP;
hdr.ifi_index = if_nametoindex(name);
netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr));
if (new_name)
netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name));
if (master) {
int ifindex = if_nametoindex(master);
netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex));
}
if (macsize)
netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize);
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: device %s up master %s: %s\n", name, master ? master : "NULL", strerror(errno));
}
}
#endif
#if SYZ_EXECUTOR || SYZ_NET_DEVICES || SYZ_NET_INJECTION
static int netlink_add_addr(struct nlmsg* nlmsg, int sock, const char* dev,
const void* addr, int addrsize)
{
struct ifaddrmsg hdr;
memset(&hdr, 0, sizeof(hdr));
hdr.ifa_family = addrsize == 4 ? AF_INET : AF_INET6;
hdr.ifa_prefixlen = addrsize == 4 ? 24 : 120;
hdr.ifa_scope = RT_SCOPE_UNIVERSE;
hdr.ifa_index = if_nametoindex(dev);
netlink_init(nlmsg, RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, &hdr, sizeof(hdr));
netlink_attr(nlmsg, IFA_LOCAL, addr, addrsize);
netlink_attr(nlmsg, IFA_ADDRESS, addr, addrsize);
return netlink_send(nlmsg, sock);
}
static void netlink_add_addr4(struct nlmsg* nlmsg, int sock,
const char* dev, const char* addr)
{
struct in_addr in_addr;
inet_pton(AF_INET, addr, &in_addr);
int err = netlink_add_addr(nlmsg, sock, dev, &in_addr, sizeof(in_addr));
if (err < 0) {
debug("netlink: add addr %s dev %s: %s\n", addr, dev, strerror(errno));
}
}
static void netlink_add_addr6(struct nlmsg* nlmsg, int sock,
const char* dev, const char* addr)
{
struct in6_addr in6_addr;
inet_pton(AF_INET6, addr, &in6_addr);
int err = netlink_add_addr(nlmsg, sock, dev, &in6_addr, sizeof(in6_addr));
if (err < 0) {
debug("netlink: add addr %s dev %s: %s\n", addr, dev, strerror(errno));
}
}
#endif
#if SYZ_EXECUTOR || SYZ_NET_INJECTION
static void netlink_add_neigh(struct nlmsg* nlmsg, int sock, const char* name,
const void* addr, int addrsize, const void* mac, int macsize)
{
struct ndmsg hdr;
memset(&hdr, 0, sizeof(hdr));
hdr.ndm_family = addrsize == 4 ? AF_INET : AF_INET6;
hdr.ndm_ifindex = if_nametoindex(name);
hdr.ndm_state = NUD_PERMANENT;
netlink_init(nlmsg, RTM_NEWNEIGH, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr));
netlink_attr(nlmsg, NDA_DST, addr, addrsize);
netlink_attr(nlmsg, NDA_LLADDR, mac, macsize);
int err = netlink_send(nlmsg, sock);
if (err < 0) {
debug("netlink: add neigh %s addr %d lladdr %d: %s\n", name, addrsize, macsize, strerror(errno));
}
}
#endif
#endif
#if SYZ_EXECUTOR || SYZ_NET_DEVICES || SYZ_NET_INJECTION || SYZ_DEVLINK_PCI || SYZ_WIFI || SYZ_802154
static struct nlmsg nlmsg;
#endif
#if SYZ_EXECUTOR || SYZ_NET_INJECTION
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <stdarg.h>
#include <stdbool.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.h>
static int tunfd = -1;
#define TUN_IFACE "syz_tun"
#define LOCAL_MAC 0xaaaaaaaaaaaa
#define REMOTE_MAC 0xaaaaaaaaaabb
#define LOCAL_IPV4 "172.20.20.170"
#define REMOTE_IPV4 "172.20.20.187"
#define LOCAL_IPV6 "fe80::aa"
#define REMOTE_IPV6 "fe80::bb"
#ifndef IFF_NAPI
#define IFF_NAPI 0x0010
#endif
#if ENABLE_NAPI_FRAGS
static int tun_frags_enabled;
#ifndef IFF_NAPI_FRAGS
#define IFF_NAPI_FRAGS 0x0020
#endif
#endif
static void initialize_tun(void)
{
#if SYZ_EXECUTOR
if (!flag_net_injection)
return;
#endif
tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
if (tunfd == -1) {
#if SYZ_EXECUTOR
fail("tun: can't open /dev/net/tun");
#else
printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n");
printf("otherwise fuzzing or reproducing might not work as intended\n");
return;
#endif
}
// Remap tun onto higher fd number to hide it from fuzzer and to keep
// fd numbers stable regardless of whether tun is opened or not (also see kMaxFd).
const int kTunFd = 200;
if (dup2(tunfd, kTunFd) < 0)
fail("dup2(tunfd, kTunFd) failed");
close(tunfd);
tunfd = kTunFd;
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ);
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
// Note: SYZ_ENABLE_NAPI_FRAGS is never enabled. This is code is only for reference
// in case we figure out how IFF_NAPI_FRAGS works. With IFF_NAPI_FRAGS packets
// don't reach destinations and bail out in udp_gro_receive (see #1594).
// Also IFF_NAPI_FRAGS does not work with sandbox_namespace (see comment there).
#if ENABLE_NAPI_FRAGS
ifr.ifr_flags |= IFF_NAPI | IFF_NAPI_FRAGS;
#endif
if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
#if ENABLE_NAPI_FRAGS
// IFF_NAPI_FRAGS requires root, so try without it.
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
#endif
fail("tun: ioctl(TUNSETIFF) failed");
}
#if ENABLE_NAPI_FRAGS
// If IFF_NAPI_FRAGS is not supported it will be silently dropped,
// so query the effective flags.
if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
fail("tun: ioctl(TUNGETIFF) failed");
tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;
debug("tun_frags_enabled=%d\n", tun_frags_enabled);
#endif
// Disable IPv6 DAD, otherwise the address remains unusable until DAD completes.
// Don't panic because this is an optional config.
char sysctl[64];
sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/accept_dad", TUN_IFACE);
write_file(sysctl, "0");
// Disable IPv6 router solicitation to prevent IPv6 spam.
// Don't panic because this is an optional config.
sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/router_solicitations", TUN_IFACE);
write_file(sysctl, "0");
// There seems to be no way to disable IPv6 MTD to prevent more IPv6 spam.
int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (sock == -1)
fail("socket(AF_NETLINK) failed");
netlink_add_addr4(&nlmsg, sock, TUN_IFACE, LOCAL_IPV4);
netlink_add_addr6(&nlmsg, sock, TUN_IFACE, LOCAL_IPV6);
uint64 macaddr = REMOTE_MAC;
struct in_addr in_addr;
inet_pton(AF_INET, REMOTE_IPV4, &in_addr);
netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in_addr, sizeof(in_addr), &macaddr, ETH_ALEN);
struct in6_addr in6_addr;
inet_pton(AF_INET6, REMOTE_IPV6, &in6_addr);
netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in6_addr, sizeof(in6_addr), &macaddr, ETH_ALEN);
macaddr = LOCAL_MAC;
netlink_device_change(&nlmsg, sock, TUN_IFACE, true, 0, &macaddr, ETH_ALEN, NULL);
close(sock);
}
#endif
#if SYZ_EXECUTOR || __NR_syz_init_net_socket || SYZ_DEVLINK_PCI || __NR_syz_socket_connect_nvme_tcp
const int kInitNetNsFd = 201; // see kMaxFd
#endif
#if SYZ_EXECUTOR || SYZ_DEVLINK_PCI || SYZ_NET_DEVICES
#include <linux/genetlink.h>
#include <stdbool.h>
#define DEVLINK_FAMILY_NAME "devlink"
#define DEVLINK_CMD_PORT_GET 5
#if SYZ_EXECUTOR || SYZ_DEVLINK_PCI
#define DEVLINK_CMD_RELOAD 37
#endif
#define DEVLINK_ATTR_BUS_NAME 1
#define DEVLINK_ATTR_DEV_NAME 2
#define DEVLINK_ATTR_NETDEV_NAME 7
#if SYZ_EXECUTOR || SYZ_DEVLINK_PCI
#define DEVLINK_ATTR_NETNS_FD 138
#endif
#if SYZ_EXECUTOR || SYZ_DEVLINK_PCI
static void netlink_devlink_netns_move(const char* bus_name, const char* dev_name, int netns_fd)
{
struct genlmsghdr genlhdr;
int sock;
int id, err;
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
if (sock == -1)
fail("socket(AF_NETLINK) failed");
id = netlink_query_family_id(&nlmsg, sock, DEVLINK_FAMILY_NAME, true);
if (id == -1)
goto error;
memset(&genlhdr, 0, sizeof(genlhdr));
genlhdr.cmd = DEVLINK_CMD_RELOAD;
netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr));
netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1);
netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1);
netlink_attr(&nlmsg, DEVLINK_ATTR_NETNS_FD, &netns_fd, sizeof(netns_fd));
err = netlink_send(&nlmsg, sock);
if (err < 0) {
debug("netlink: failed to move devlink instance %s/%s into network namespace: %s\n",
bus_name, dev_name, strerror(errno));
}
error:
close(sock);
}
#endif
static struct nlmsg nlmsg2;
static void initialize_devlink_ports(const char* bus_name, const char* dev_name,
const char* netdev_prefix)
{
struct genlmsghdr genlhdr;
int len, total_len, id, err, offset;
uint16 netdev_index;
int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
if (sock == -1)
fail("socket(AF_NETLINK) failed");
int rtsock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (rtsock == -1)
fail("socket(AF_NETLINK) failed");
id = netlink_query_family_id(&nlmsg, sock, DEVLINK_FAMILY_NAME, true);
if (id == -1)
goto error;
memset(&genlhdr, 0, sizeof(genlhdr));
genlhdr.cmd = DEVLINK_CMD_PORT_GET;
netlink_init(&nlmsg, id, NLM_F_DUMP, &genlhdr, sizeof(genlhdr));
netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1);
netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1);
err = netlink_send_ext(&nlmsg, sock, id, &total_len, true);
if (err < 0) {
debug("netlink: failed to get port get reply: %s\n", strerror(errno));
goto error;
}
offset = 0;
netdev_index = 0;
while ((len = netlink_next_msg(&nlmsg, offset, total_len)) != -1) {
struct nlattr* attr = (struct nlattr*)(nlmsg.buf + offset + NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(genlhdr)));
for (; (char*)attr < nlmsg.buf + offset + len; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
if (attr->nla_type == DEVLINK_ATTR_NETDEV_NAME) {
char* port_name;
char netdev_name[IFNAMSIZ];
port_name = (char*)(attr + 1);
snprintf(netdev_name, sizeof(netdev_name), "%s%d", netdev_prefix, netdev_index);
netlink_device_change(&nlmsg2, rtsock, port_name, true, 0, 0, 0, netdev_name);
break;
}
}
offset += len;
netdev_index++;
}
error:
close(rtsock);
close(sock);
}
#if SYZ_EXECUTOR || SYZ_DEVLINK_PCI
#include <fcntl.h>
#include <sched.h>
static void initialize_devlink_pci(void)
{
#if SYZ_EXECUTOR
if (!flag_devlink_pci)
return;
#endif
int netns = open("/proc/self/ns/net", O_RDONLY);
if (netns == -1)
fail("open(/proc/self/ns/net) failed");
int ret = setns(kInitNetNsFd, 0);
if (ret == -1)
fail("set_ns(init_netns_fd) failed");
netlink_devlink_netns_move("pci", "0000:00:10.0", netns);
ret = setns(netns, 0);
if (ret == -1)
fail("set_ns(this_netns_fd) failed");
close(netns);
initialize_devlink_ports("pci", "0000:00:10.0", "netpci");
}
#endif
#endif
#if SYZ_EXECUTOR || SYZ_WIFI || __NR_syz_80211_inject_frame || __NR_syz_80211_join_ibss
#define WIFI_INITIAL_DEVICE_COUNT 2
#define WIFI_MAC_BASE \
{ \
0x08, 0x02, 0x11, 0x00, 0x00, 0x00 \
}
#define WIFI_IBSS_BSSID \
{ \
0x50, 0x50, 0x50, 0x50, 0x50, 0x50 \
}
#define WIFI_IBSS_SSID \
{ \
0x10, 0x10, 0x10, 0x10, 0x10, 0x10 \
}
#define WIFI_DEFAULT_FREQUENCY 2412
#define WIFI_DEFAULT_SIGNAL 0
#define WIFI_DEFAULT_RX_RATE 1
// consts from drivers/net/wireless/mac80211_hwsim.h
#define HWSIM_CMD_REGISTER 1
#define HWSIM_CMD_FRAME 2
#define HWSIM_CMD_NEW_RADIO 4
#define HWSIM_ATTR_SUPPORT_P2P_DEVICE 14
#define HWSIM_ATTR_PERM_ADDR 22
#endif
#if SYZ_EXECUTOR || SYZ_WIFI || __NR_syz_80211_join_ibss
#include <linux/genetlink.h>
#include <linux/if_ether.h>
#include <linux/nl80211.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
#include <stdbool.h>
#include <sys/ioctl.h>
// From linux/if.h, but we cannot include the file as it conflicts with net/if.h
#define IF_OPER_UP 6
// IBSS parameters for nl80211_join_ibss
struct join_ibss_props {
int wiphy_freq;
bool wiphy_freq_fixed;
uint8* mac;
uint8* ssid;
int ssid_len;
};
static int set_interface_state(const char* interface_name, int on)
{
struct ifreq ifr;
int sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
debug("set_interface_state: failed to open socket, errno %d\n", errno);
return -1;
}
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, interface_name);
int ret = ioctl(sock, SIOCGIFFLAGS, &ifr);
if (ret < 0) {
debug("set_interface_state: failed to execute SIOCGIFFLAGS, ret %d\n", ret);
close(sock);
return -1;
}
if (on)
ifr.ifr_flags |= IFF_UP;
else
ifr.ifr_flags &= ~IFF_UP;
ret = ioctl(sock, SIOCSIFFLAGS, &ifr);
close(sock);
if (ret < 0) {
debug("set_interface_state: failed to execute SIOCSIFFLAGS, ret %d\n", ret);
return -1;
}
return 0;
}
static int nl80211_set_interface(struct nlmsg* nlmsg, int sock, int nl80211_family, uint32 ifindex,
uint32 iftype, bool dofail)
{
struct genlmsghdr genlhdr;
memset(&genlhdr, 0, sizeof(genlhdr));
genlhdr.cmd = NL80211_CMD_SET_INTERFACE;
netlink_init(nlmsg, nl80211_family, 0, &genlhdr, sizeof(genlhdr));
netlink_attr(nlmsg, NL80211_ATTR_IFINDEX, &ifindex, sizeof(ifindex));
netlink_attr(nlmsg, NL80211_ATTR_IFTYPE, &iftype, sizeof(iftype));
int err = netlink_send_ext(nlmsg, sock, 0, NULL, dofail);
if (err < 0) {
debug("nl80211_set_interface failed: %s\n", strerror(errno));
}
return err;
}
static int nl80211_join_ibss(struct nlmsg* nlmsg, int sock, int nl80211_family, uint32 ifindex,
struct join_ibss_props* props, bool dofail)
{
struct genlmsghdr genlhdr;
memset(&genlhdr, 0, sizeof(genlhdr));
genlhdr.cmd = NL80211_CMD_JOIN_IBSS;
netlink_init(nlmsg, nl80211_family, 0, &genlhdr, sizeof(genlhdr));
netlink_attr(nlmsg, NL80211_ATTR_IFINDEX, &ifindex, sizeof(ifindex));
netlink_attr(nlmsg, NL80211_ATTR_SSID, props->ssid, props->ssid_len);
netlink_attr(nlmsg, NL80211_ATTR_WIPHY_FREQ, &(props->wiphy_freq), sizeof(props->wiphy_freq));
if (props->mac)
netlink_attr(nlmsg, NL80211_ATTR_MAC, props->mac, ETH_ALEN);
if (props->wiphy_freq_fixed)
netlink_attr(nlmsg, NL80211_ATTR_FREQ_FIXED, NULL, 0);
int err = netlink_send_ext(nlmsg, sock, 0, NULL, dofail);
if (err < 0) {
debug("nl80211_join_ibss failed: %s\n", strerror(errno));
}
return err;
}
static int get_ifla_operstate(struct nlmsg* nlmsg, int ifindex, bool dofail)
{
struct ifinfomsg info;
memset(&info, 0, sizeof(info));
info.ifi_family = AF_UNSPEC;
info.ifi_index = ifindex;