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bpo-38282: Rewrite getsockaddrarg() helper function (GH-16698)

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Rewrite getsockaddrarg() helper function of socketmodule.c (_socket
module) to prevent a false alarm when compiling codde using GCC with
_FORTIFY_SOURCE=2. Pass a pointer of the sock_addr_t union, rather
than passing a pointer to a sockaddr structure.

Add "struct sockaddr_tipc tipc;" to the sock_addr_t union.
This commit is contained in:
Victor Stinner 2019-10-10 21:30:20 +02:00 • committed by GitHub
parent 1dbe537385
commit d565fb9828
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 25 additions and 39 deletions
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61
Modules/socketmodule.c
View file

@ -1688,14 +1688,13 @@ idna_converter(PyObject *obj, struct maybe_idna *data)
static int
getsockaddrarg(PySocketSockObject *s, PyObject *args,
struct sockaddr *addr_ret, int *len_ret, const char *caller)
sock_addr_t *addrbuf, int *len_ret, const char *caller)
{
switch (s->sock_family) {
#if defined(AF_UNIX)
case AF_UNIX:
{
struct sockaddr_un* addr;
Py_buffer path;
int retval = 0;
@ -1713,7 +1712,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
}
assert(path.len >= 0);
addr = (struct sockaddr_un*)addr_ret;
struct sockaddr_un* addr = &addrbuf->un;
#ifdef __linux__
if (path.len > 0 && *(const char *)path.buf == 0) {
/* Linux abstract namespace extension */
@ -1748,9 +1747,8 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#if defined(AF_NETLINK)
case AF_NETLINK:
{
struct sockaddr_nl* addr;
int pid, groups;
addr = (struct sockaddr_nl *)addr_ret;
struct sockaddr_nl* addr = &addrbuf->nl;
if (!PyTuple_Check(args)) {
PyErr_Format(
PyExc_TypeError,
@ -1776,9 +1774,8 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#if defined(AF_QIPCRTR)
case AF_QIPCRTR:
{
struct sockaddr_qrtr* addr;
unsigned int node, port;
addr = (struct sockaddr_qrtr *)addr_ret;
struct sockaddr_qrtr* addr = &addrbuf->sq;
if (!PyTuple_Check(args)) {
PyErr_Format(
PyExc_TypeError,
@ -1800,9 +1797,8 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#if defined(AF_VSOCK)
case AF_VSOCK:
{
struct sockaddr_vm* addr;
struct sockaddr_vm* addr = &addrbuf->vm;
int port, cid;
addr = (struct sockaddr_vm *)addr_ret;
memset(addr, 0, sizeof(struct sockaddr_vm));
if (!PyTuple_Check(args)) {
PyErr_Format(
@ -1830,7 +1826,6 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
case AF_INET:
{
struct sockaddr_in* addr;
struct maybe_idna host = {NULL, NULL};
int port, result;
if (!PyTuple_Check(args)) {
@ -1852,7 +1847,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
}
return 0;
}
addr=(struct sockaddr_in*)addr_ret;
struct sockaddr_in* addr = &addrbuf->in;
result = setipaddr(host.buf, (struct sockaddr *)addr,
sizeof(*addr), AF_INET);
idna_cleanup(&host);
@ -1873,7 +1868,6 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#ifdef ENABLE_IPV6
case AF_INET6:
{
struct sockaddr_in6* addr;
struct maybe_idna host = {NULL, NULL};
int port, result;
unsigned int flowinfo, scope_id;
@ -1898,7 +1892,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
}
return 0;
}
addr = (struct sockaddr_in6*)addr_ret;
struct sockaddr_in6* addr = &addrbuf->in6;
result = setipaddr(host.buf, (struct sockaddr *)addr,
sizeof(*addr), AF_INET6);
idna_cleanup(&host);
@ -1932,10 +1926,9 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#ifdef BTPROTO_L2CAP
case BTPROTO_L2CAP:
{
struct sockaddr_l2 *addr;
const char *straddr;
addr = (struct sockaddr_l2 *)addr_ret;
struct sockaddr_l2 *addr = &addrbuf->bt_l2;
memset(addr, 0, sizeof(struct sockaddr_l2));
_BT_L2_MEMB(addr, family) = AF_BLUETOOTH;
if (!PyArg_ParseTuple(args, "si", &straddr,
@ -1953,10 +1946,8 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#endif /* BTPROTO_L2CAP */
case BTPROTO_RFCOMM:
{
struct sockaddr_rc *addr;
const char *straddr;
addr = (struct sockaddr_rc *)addr_ret;
struct sockaddr_rc *addr = &addrbuf->bt_rc;
_BT_RC_MEMB(addr, family) = AF_BLUETOOTH;
if (!PyArg_ParseTuple(args, "si", &straddr,
&_BT_RC_MEMB(addr, channel))) {
@ -1973,7 +1964,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#ifdef BTPROTO_HCI
case BTPROTO_HCI:
{
struct sockaddr_hci *addr = (struct sockaddr_hci *)addr_ret;
struct sockaddr_hci *addr = &addrbuf->bt_hci;
#if defined(__NetBSD__) || defined(__DragonFly__)
const char *straddr;
_BT_HCI_MEMB(addr, family) = AF_BLUETOOTH;
@ -1999,10 +1990,9 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#if !defined(__FreeBSD__)
case BTPROTO_SCO:
{
struct sockaddr_sco *addr;
const char *straddr;
addr = (struct sockaddr_sco *)addr_ret;
struct sockaddr_sco *addr = &addrbuf->bt_sco;
_BT_SCO_MEMB(addr, family) = AF_BLUETOOTH;
if (!PyBytes_Check(args)) {
PyErr_Format(PyExc_OSError,
@ -2029,7 +2019,6 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#if defined(HAVE_NETPACKET_PACKET_H) && defined(SIOCGIFINDEX)
case AF_PACKET:
{
struct sockaddr_ll* addr;
struct ifreq ifr;
const char *interfaceName;
int protoNumber;
@ -2080,7 +2069,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
PyBuffer_Release(&haddr);
return 0;
}
addr = (struct sockaddr_ll*)addr_ret;
struct sockaddr_ll* addr = &addrbuf->ll;
addr->sll_family = AF_PACKET;
addr->sll_protocol = htons((short)protoNumber);
addr->sll_ifindex = ifr.ifr_ifindex;
@ -2103,7 +2092,6 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
{
unsigned int atype, v1, v2, v3;
unsigned int scope = TIPC_CLUSTER_SCOPE;
struct sockaddr_tipc *addr;
if (!PyTuple_Check(args)) {
PyErr_Format(
@ -2121,7 +2109,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
return 0;
}
addr = (struct sockaddr_tipc *) addr_ret;
struct sockaddr_tipc *addr = &addrbuf->tipc;
memset(addr, 0, sizeof(struct sockaddr_tipc));
addr->family = AF_TIPC;
@ -2162,11 +2150,10 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#endif
#if defined(CAN_RAW) || defined(CAN_BCM)
{
struct sockaddr_can *addr;
PyObject *interfaceName;
struct ifreq ifr;
Py_ssize_t len;
addr = (struct sockaddr_can *)addr_ret;
struct sockaddr_can *addr = &addrbuf->can;
if (!PyTuple_Check(args)) {
PyErr_Format(PyExc_TypeError,
@ -2213,13 +2200,12 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#ifdef CAN_ISOTP
case CAN_ISOTP:
{
struct sockaddr_can *addr;
PyObject *interfaceName;
struct ifreq ifr;
Py_ssize_t len;
unsigned long int rx_id, tx_id;
addr = (struct sockaddr_can *)addr_ret;
struct sockaddr_can *addr = &addrbuf->can;
if (!PyArg_ParseTuple(args, "O&kk", PyUnicode_FSConverter,
&interfaceName,
@ -2269,9 +2255,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#ifdef SYSPROTO_CONTROL
case SYSPROTO_CONTROL:
{
struct sockaddr_ctl *addr;
addr = (struct sockaddr_ctl *)addr_ret;
struct sockaddr_ctl *addr = &addrbuf->ctl;
addr->sc_family = AF_SYSTEM;
addr->ss_sysaddr = AF_SYS_CONTROL;
@ -2323,10 +2307,9 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
#ifdef HAVE_SOCKADDR_ALG
case AF_ALG:
{
struct sockaddr_alg *sa;
const char *type;
const char *name;
sa = (struct sockaddr_alg *)addr_ret;
struct sockaddr_alg *sa = &addrbuf->alg;
memset(sa, 0, sizeof(*sa));
sa->salg_family = AF_ALG;
@ -3110,7 +3093,7 @@ sock_bind(PySocketSockObject *s, PyObject *addro)
int addrlen;
int res;
if (!getsockaddrarg(s, addro, SAS2SA(&addrbuf), &addrlen, "bind")) {
if (!getsockaddrarg(s, addro, &addrbuf, &addrlen, "bind")) {
return NULL;
}
@ -3280,7 +3263,7 @@ sock_connect(PySocketSockObject *s, PyObject *addro)
int addrlen;
int res;
if (!getsockaddrarg(s, addro, SAS2SA(&addrbuf), &addrlen, "connect")) {
if (!getsockaddrarg(s, addro, &addrbuf, &addrlen, "connect")) {
return NULL;
}
@ -3311,7 +3294,7 @@ sock_connect_ex(PySocketSockObject *s, PyObject *addro)
int addrlen;
int res;
if (!getsockaddrarg(s, addro, SAS2SA(&addrbuf), &addrlen, "connect_ex")) {
if (!getsockaddrarg(s, addro, &addrbuf, &addrlen, "connect_ex")) {
return NULL;
}
@ -4316,7 +4299,7 @@ sock_sendto(PySocketSockObject *s, PyObject *args)
return select_error();
}
if (!getsockaddrarg(s, addro, SAS2SA(&addrbuf), &addrlen, "sendto")) {
if (!getsockaddrarg(s, addro, &addrbuf, &addrlen, "sendto")) {
PyBuffer_Release(&pbuf);
return NULL;
}
@ -4451,7 +4434,7 @@ sock_sendmsg(PySocketSockObject *s, PyObject *args)
/* Parse destination address. */
if (addr_arg != NULL && addr_arg != Py_None) {
if (!getsockaddrarg(s, addr_arg, SAS2SA(&addrbuf), &addrlen,
if (!getsockaddrarg(s, addr_arg, &addrbuf, &addrlen,
"sendmsg"))
{
goto finally;

3
Modules/socketmodule.h
View file

@ -261,6 +261,9 @@ typedef union sock_addr {
#ifdef AF_VSOCK
struct sockaddr_vm vm;
#endif
#ifdef HAVE_LINUX_TIPC_H
struct sockaddr_tipc tipc;
#endif
} sock_addr_t;
/* The object holding a socket. It holds some extra information,