/*
* Generate and munge a 64bit number.
*/
u64 rand64(void)
{
unsigned long r = 0;
if (RAND_BOOL()) {
/* 32-bit ranges. */
r = rand32();
} else {
/* 33:64-bit ranges. */
switch (rand() % 5) {
case 0: r = rand_single_bit(64);
break;
case 1: r = randbits(64);
break;
case 2: r = RAND_64();
break;
case 3: r = rept_byte();
break;
/* Sometimes pick a not-so-random number. */
case 4: return get_interesting_value();
}
/* limit the size */
switch (rand() % 4) {
case 0: r &= 0x000000ffffffffffULL;
break;
case 1: r &= 0x0000ffffffffffffULL;
break;
case 2: r &= 0x00ffffffffffffffULL;
break;
default: /* no limiting. */
break;
}
}
/* Sometimes invert the generated number. */
if (ONE_IN(25))
r = ~r;
/* increase distribution in MSB */
if (ONE_IN(10)) {
unsigned int i;
unsigned int rounds;
rounds = rand() % 4;
for (i = 0; i < rounds; i++)
r |= (1UL << ((__WORDSIZE - 1) - (rand() % 8)));
}
/* Sometimes flip sign */
if (ONE_IN(25))
r = ~r + 1;
return r;
}
/*
* Generate, and munge a 32bit number.
*/
unsigned int rand32(void)
{
unsigned long r = 0;
switch (rnd() % 7) {
case 0: r = RAND_BYTE();
break;
case 1: r = rand16();
break;
case 2: r = rand_single_bit(32);
break;
case 3: r = randbits(32);
break;
case 4: r = rnd();
break;
case 5: r = rept_byte();
break;
case 6: return get_interesting_value();
}
/* Sometimes deduct it from INT_MAX */
if (ONE_IN(25))
r = INT_MAX - r;
/* Sometimes flip sign */
if (ONE_IN(25))
r = ~r + 1;
/* we might get lucky if something is counting ints/longs etc. */
if (ONE_IN(4)) {
int _div = 1 << RAND_RANGE(1, 4); /* 2,4,8 or 16 */
r /= _div;
}
/* limit the size */
switch (rnd() % 5) {
case 0: r &= 0xff;
break;
case 1: r &= 0xffff;
break;
case 2: r &= PAGE_MASK;
break;
case 3: r &= 0xffffff;
break;
case 4: // do nothing
break;
}
return r;
}
static void generic_sanitise_ioctl(struct syscallrecord *rec)
{
if (ONE_IN(50))
ioctl_mangle_cmd(rec);
ioctl_mangle_arg(rec);
}
static void sanitise_linkat(struct syscallrecord *rec)
{
/* .. If oldpath is relative and olddirfd is the special value AT_FDCWD, then oldpath is
* interpreted relative to the current working directory of the calling process */
if (ONE_IN(100))
rec->a1 = AT_FDCWD;
}
static void sanitise_ioctl(struct syscallrecord *rec)
{
const struct ioctl_group *grp;
if (ONE_IN(100))
grp = get_random_ioctl_group();
else
grp = find_ioctl_group(rec->a1);
if (grp) {
ioctl_mangle_arg(rec);
grp->sanitise(grp, rec);
if (ONE_IN(100))
ioctl_mangle_cmd(rec);
} else
generic_sanitise_ioctl(rec);
}
/*
* Generate, and munge a 16bit number.
*/
unsigned short rand16(void)
{
unsigned short r = 0, r2;
switch (rnd() % 5) {
case 0: r = RAND_BYTE();
break;
case 1: r = rand_single_bit(16);
break;
case 2: r = randbits(16);
break;
case 3: r = rnd();
break;
case 4: r2 = rnd() & 0xff;
r = r2 | r2 << 8;
break;
}
/* Sometimes flip sign */
if (ONE_IN(25))
r = ~r + 1;
if (ONE_IN(4)) {
int _div = 1 << RAND_RANGE(1, 4); /* 2,4,8 or 16 */
r /= _div;
}
/* limit the size */
switch (rnd() % 4) {
case 0: r &= 0xff;
break;
case 1: r &= 0xfff;
break;
case 2: r &= PAGE_MASK;
break;
case 3: // do nothing
break;
}
return r;
}
static void gen_random_ipv6_address(struct in6_addr *v6)
{
const char *p;
/* 90% of the time, just do localhost */
if (!(ONE_IN(10))) {
inet_pton(AF_INET6, "::1", v6);
return;
}
if (RAND_BOOL()) {
/* v4 in v6 somehow. */
in_addr_t v4;
const struct addrtext v4_in_v6_addresses[] = {
{ "::" }, /* deprecated ipv4 style ::v4 */
{ "::ffff:0:0" }, /* v4 in v6 ::ffff:0:0/96 */
{ "::ffff:0:0:0" }, /* stateless IP/ICMP translation (SIIT) ::ffff:0:0:0/96 */
{ "2002::" }, /* 2002::/16 "6to4" */
};
p = RAND_ELEMENT(v4_in_v6_addresses, name);
inet_pton(AF_INET6, p, v6);
v4 = random_ipv4_address();
v6->s6_addr32[3] = htonl(v4);
} else {
/* actual v6 addresses. */
const struct addrtext v6_addresses[] = {
{ "::" }, /* ::/128 unspecified */
{ "fe80::" }, /* fe80::/10 link-local */
{ "fc00::" }, /* fc00::/7 unique local address (ULA) */
{ "64:ff9b::" }, /* 64:ff9b::/96 "Well known" prefix */
{ "0100::" }, /* 0100::/64 remotely triggered blackhole */
};
p = RAND_ELEMENT(v6_addresses, name);
inet_pton(AF_INET6, p, v6);
}
}
/*
* SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
*/
static void sanitise_sendmsg(struct syscallrecord *rec)
{
struct socketinfo *si = (struct socketinfo *) rec->a1;
struct msghdr *msg;
struct sockaddr *sa = NULL;
socklen_t salen = 0;
if (si == NULL) // handle --disable-fds=sockets
goto skip_si;
rec->a1 = fd_from_socketinfo((struct socketinfo *) rec->a1);
generate_sockaddr((struct sockaddr **) &sa, (socklen_t *) &salen, si->triplet.family);
skip_si:
msg = zmalloc(sizeof(struct msghdr));
msg->msg_name = sa;
msg->msg_namelen = salen;
if (RAND_BOOL()) {
unsigned int num_entries;
num_entries = RAND_RANGE(1, 3);
msg->msg_iov = alloc_iovec(num_entries);
msg->msg_iovlen = num_entries;
}
if (RAND_BOOL()) {
msg->msg_controllen = rand32() % 20480; // /proc/sys/net/core/optmem_max
msg->msg_control = get_address();
} else {
msg->msg_controllen = 0;
}
if (ONE_IN(100))
msg->msg_flags = rand32();
else
msg->msg_flags = 0;
rec->a2 = (unsigned long) msg;
}
static bool choose_syscall_table(void)
{
bool do32 = FALSE;
if (biarch == FALSE) {
active_syscalls = shm->active_syscalls;
} else {
/* First, check that we have syscalls enabled in either table. */
if (validate_syscall_table_64() == FALSE) {
use_64bit = FALSE;
/* If no 64bit syscalls enabled, force 32bit. */
do32 = TRUE;
}
if (validate_syscall_table_32() == FALSE)
use_32bit = FALSE;
/* If both tables enabled, pick randomly. */
if ((use_64bit == TRUE) && (use_32bit == TRUE)) {
/* 10% possibility of a 32bit syscall */
if (ONE_IN(10))
do32 = TRUE;
}
if (do32 == FALSE) {
syscalls = syscalls_64bit;
active_syscalls = shm->active_syscalls64;
max_nr_syscalls = max_nr_64bit_syscalls;
} else {
syscalls = syscalls_32bit;
active_syscalls = shm->active_syscalls32;
max_nr_syscalls = max_nr_32bit_syscalls;
}
}
return do32;
}
static void socket_destructor(struct object *obj)
{
struct socketinfo *si = &obj->sockinfo;
struct linger ling = { .l_onoff = FALSE, .l_linger = 0 };
int fd;
//FIXME: This is a workaround for a weird bug where we hang forevre
// waiting for bluetooth sockets when we setsockopt.
// Hopefully at some point we can remove this when someone figures out what's going on.
if (si->triplet.family == PF_BLUETOOTH)
return;
/* Grab an fd, and nuke it before someone else uses it. */
fd = si->fd;
si->fd = 0;
/* disable linger */
(void) setsockopt(fd, SOL_SOCKET, SO_LINGER, &ling, sizeof(struct linger));
(void) shutdown(fd, SHUT_RDWR);
if (close(fd) != 0)
output(1, "failed to close socket [%d:%d:%d].(%s)\n",
si->triplet.family,
si->triplet.type,
si->triplet.protocol,
strerror(errno));
}
static void socket_dump(struct object *obj, bool global)
{
struct socketinfo *si = &obj->sockinfo;
struct msg_objcreatedsocket objmsg;
output(2, "socket fd:%d domain:%u (%s) type:0x%u protocol:%u\n",
si->fd, si->triplet.family, get_domain_name(si->triplet.family),
si->triplet.type, si->triplet.protocol);
init_msgobjhdr(&objmsg.hdr, OBJ_CREATED_SOCKET, global, obj);
objmsg.si.fd = si->fd;
objmsg.si.triplet.family = si->triplet.family;
objmsg.si.triplet.type = si->triplet.type;
objmsg.si.triplet.protocol = si->triplet.protocol;
sendudp((char *) &objmsg, sizeof(objmsg));
}
static int open_sockets(void)
{
struct objhead *head;
int bytesread = -1;
int ret;
head = get_objhead(OBJ_GLOBAL, OBJ_FD_SOCKET);
head->destroy = &socket_destructor;
head->dump = &socket_dump;
cachefile = open(cachefilename, O_RDONLY);
if (cachefile < 0) {
output(1, "Couldn't find socket cachefile. Regenerating.\n");
ret = generate_sockets();
output(1, "created %d sockets\n", nr_sockets);
return ret;
}
lock_cachefile(F_RDLCK);
while (bytesread != 0) {
unsigned int domain, type, protocol;
unsigned int buffer[3];
int fd;
bytesread = read(cachefile, buffer, sizeof(int) * 3);
if (bytesread == 0) {
if (nr_sockets == 0)
goto regenerate;
break;
}
domain = buffer[0];
type = buffer[1];
protocol = buffer[2];
if (domain >= TRINITY_PF_MAX) {
output(1, "cachefile contained invalid domain %u\n", domain);
goto regenerate;
}
if ((do_specific_domain == TRUE && domain != specific_domain) ||
(no_domains[domain] == TRUE)) {
output(1, "ignoring socket cachefile due to specific "
"protocol request (or protocol disabled), "
"and stale data in cachefile.\n");
regenerate:
unlock_cachefile(); /* drop the reader lock. */
close(cachefile);
unlink(cachefilename);
ret = generate_sockets();
return ret;
}
fd = open_socket(domain, type, protocol);
if (fd < 0) {
output(1, "Cachefile is stale. Need to regenerate.\n");
goto regenerate;
}
/* check for ctrl-c */
if (shm->exit_reason != STILL_RUNNING) {
close(cachefile);
return FALSE;
}
}
output(1, "%d sockets created based on info from socket cachefile.\n", nr_sockets);
unlock_cachefile();
close(cachefile);
return TRUE;
}
struct socketinfo * get_rand_socketinfo(void)
{
struct object *obj;
/* When using victim files, sockets can be 0. */
if (objects_empty(OBJ_FD_SOCKET) == TRUE)
return NULL;
obj = get_random_object(OBJ_FD_SOCKET, OBJ_GLOBAL);
return &obj->sockinfo;
}
static int get_rand_socket_fd(void)
{
struct socketinfo *sockinfo;
sockinfo = get_rand_socketinfo();
if (sockinfo == NULL)
return -1;
return sockinfo->fd;
}
int fd_from_socketinfo(struct socketinfo *si)
{
if (si != NULL) {
if (!(ONE_IN(1000)))
return si->fd;
}
return get_random_fd();
}
static const struct fd_provider socket_fd_provider = {
.name = "sockets",
.enabled = TRUE,
.open = &open_sockets,
.get = &get_rand_socket_fd,
};
REG_FD_PROV(socket_fd_provider);