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Merge #14728: fix uninitialized read when stringifying an addrLocal

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b7b36decaf878a8c1dcfdb4a27196c730043474b fix uninitialized read when stringifying an addrLocal (Kaz Wesley)
8ebbef016928811756e46b9086067d1c826797a8 add test demonstrating addrLocal UB (Kaz Wesley)

Pull request description:

  Reachable from either place where SetIP is used when all of:
  - our best-guess addrLocal for a peer is IPv4
  - the peer tells us it's reaching us at an IPv6 address
  - NET logging is enabled

  In that case, SetIP turns an IPv4 address into an IPv6 address without
  setting the scopeId, which is subsequently read in GetSockAddr during
  CNetAddr::ToStringIP and passed to getnameinfo. Fix by ensuring every
  constructor initializes the scopeId field with something.

Tree-SHA512: 8f0159750995e08b985335ccf60a273ebd09003990bcf2c3838b550ed8dc2659552ac7611650e6dd8e29d786fe52ed57674f5880f2e18dc594a7a863134739e3
This commit is contained in:
Wladimir J. van der Laan 2020-06-09 19:06:54 -05:00 committed by pasta
parent 0f2b3f2226
commit 0211eecb14
3 changed files with 39 additions and 2 deletions
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1
src/netaddress.cpp
View File

@ -20,7 +20,6 @@ bool fAllowPrivateNet = DEFAULT_ALLOWPRIVATENET;
CNetAddr::CNetAddr()
{
memset(ip, 0, sizeof(ip));
scopeId = 0;
}
void CNetAddr::SetIP(const CNetAddr& ipIn)

2
src/netaddress.h
View File

@ -34,7 +34,7 @@ class CNetAddr
{
protected:
unsigned char ip[16]; // in network byte order
uint32_t scopeId; // for scoped/link-local ipv6 addresses
uint32_t scopeId{0}; // for scoped/link-local ipv6 addresses
public:
CNetAddr();

38
src/test/net_tests.cpp
View File

@ -201,4 +201,42 @@ BOOST_AUTO_TEST_CASE(PoissonNextSend)
g_mock_deterministic_tests = false;
}
// prior to PR #14728, this test triggers an undefined behavior
BOOST_AUTO_TEST_CASE(ipv4_peer_with_ipv6_addrMe_test)
{
// set up local addresses; all that's necessary to reproduce the bug is
// that a normal IPv4 address is among the entries, but if this address is
// !IsRoutable the undefined behavior is easier to trigger deterministically
{
LOCK(cs_mapLocalHost);
in_addr ipv4AddrLocal;
ipv4AddrLocal.s_addr = 0x0100007f;
CNetAddr addr = CNetAddr(ipv4AddrLocal);
LocalServiceInfo lsi;
lsi.nScore = 23;
lsi.nPort = 42;
mapLocalHost[addr] = lsi;
}
// create a peer with an IPv4 address
in_addr ipv4AddrPeer;
ipv4AddrPeer.s_addr = 0xa0b0c001;
CAddress addr = CAddress(CService(ipv4AddrPeer, 7777), NODE_NETWORK);
std::unique_ptr<CNode> pnode = MakeUnique<CNode>(0, NODE_NETWORK, 0, INVALID_SOCKET, addr, 0, 0, CAddress{}, std::string{}, false);
pnode->fSuccessfullyConnected.store(true);
// the peer claims to be reaching us via IPv6
in6_addr ipv6AddrLocal;
memset(ipv6AddrLocal.s6_addr, 0, 16);
ipv6AddrLocal.s6_addr[0] = 0xcc;
CAddress addrLocal = CAddress(CService(ipv6AddrLocal, 7777), NODE_NETWORK);
pnode->SetAddrLocal(addrLocal);
// before patch, this causes undefined behavior detectable with clang's -fsanitize=memory
AdvertiseLocal(&*pnode);
// suppress no-checks-run warning; if this test fails, it's by triggering a sanitizer
BOOST_CHECK(1);
}
BOOST_AUTO_TEST_SUITE_END()