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-rw-r--r--test/syscalls/linux/socket_generic_stress.cc48
-rw-r--r--test/syscalls/linux/socket_inet_loopback_nogotsan.cc74
-rw-r--r--test/syscalls/linux/socket_test_util.cc39
-rw-r--r--test/syscalls/linux/socket_test_util.h4
4 files changed, 113 insertions, 52 deletions
diff --git a/test/syscalls/linux/socket_generic_stress.cc b/test/syscalls/linux/socket_generic_stress.cc
index c35aa2183..778c32a8e 100644
--- a/test/syscalls/linux/socket_generic_stress.cc
+++ b/test/syscalls/linux/socket_generic_stress.cc
@@ -37,49 +37,11 @@
namespace gvisor {
namespace testing {
-constexpr char kRangeFile[] = "/proc/sys/net/ipv4/ip_local_port_range";
-
-PosixErrorOr<int> NumPorts() {
- int min = 0;
- int max = 1 << 16;
-
- // Read the ephemeral range from /proc.
- ASSIGN_OR_RETURN_ERRNO(std::string rangefile, GetContents(kRangeFile));
- const std::string err_msg =
- absl::StrFormat("%s has invalid content: %s", kRangeFile, rangefile);
- if (rangefile.back() != '\n') {
- return PosixError(EINVAL, err_msg);
- }
- rangefile.pop_back();
- std::vector<std::string> range =
- absl::StrSplit(rangefile, absl::ByAnyChar("\t "));
- if (range.size() < 2 || !absl::SimpleAtoi(range.front(), &min) ||
- !absl::SimpleAtoi(range.back(), &max)) {
- return PosixError(EINVAL, err_msg);
- }
-
- // If we can open as writable, limit the range.
- if (!access(kRangeFile, W_OK)) {
- ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd,
- Open(kRangeFile, O_WRONLY | O_TRUNC, 0));
- max = min + 50;
- const std::string small_range = absl::StrFormat("%d %d", min, max);
- int n = write(fd.get(), small_range.c_str(), small_range.size());
- if (n < 0) {
- return PosixError(
- errno,
- absl::StrFormat("write(%d [%s], \"%s\", %d)", fd.get(), kRangeFile,
- small_range.c_str(), small_range.size()));
- }
- }
- return max - min;
-}
-
// Test fixture for tests that apply to pairs of connected sockets.
using ConnectStressTest = SocketPairTest;
TEST_P(ConnectStressTest, Reset) {
- const int nports = ASSERT_NO_ERRNO_AND_VALUE(NumPorts());
+ const int nports = ASSERT_NO_ERRNO_AND_VALUE(MaybeLimitEphemeralPorts());
for (int i = 0; i < nports * 2; i++) {
const std::unique_ptr<SocketPair> sockets =
ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
@@ -103,7 +65,7 @@ TEST_P(ConnectStressTest, Reset) {
// Tests that opening too many connections -- without closing them -- does lead
// to port exhaustion.
TEST_P(ConnectStressTest, TooManyOpen) {
- const int nports = ASSERT_NO_ERRNO_AND_VALUE(NumPorts());
+ const int nports = ASSERT_NO_ERRNO_AND_VALUE(MaybeLimitEphemeralPorts());
int err_num = 0;
std::vector<std::unique_ptr<SocketPair>> sockets =
std::vector<std::unique_ptr<SocketPair>>(nports);
@@ -164,7 +126,7 @@ class PersistentListenerConnectStressTest : public SocketPairTest {
};
TEST_P(PersistentListenerConnectStressTest, ShutdownCloseFirst) {
- const int nports = ASSERT_NO_ERRNO_AND_VALUE(NumPorts());
+ const int nports = ASSERT_NO_ERRNO_AND_VALUE(MaybeLimitEphemeralPorts());
for (int i = 0; i < nports * 2; i++) {
std::unique_ptr<SocketPair> sockets =
ASSERT_NO_ERRNO_AND_VALUE(NewSocketSleep());
@@ -185,7 +147,7 @@ TEST_P(PersistentListenerConnectStressTest, ShutdownCloseFirst) {
}
TEST_P(PersistentListenerConnectStressTest, ShutdownCloseSecond) {
- const int nports = ASSERT_NO_ERRNO_AND_VALUE(NumPorts());
+ const int nports = ASSERT_NO_ERRNO_AND_VALUE(MaybeLimitEphemeralPorts());
for (int i = 0; i < nports * 2; i++) {
const std::unique_ptr<SocketPair> sockets =
ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
@@ -206,7 +168,7 @@ TEST_P(PersistentListenerConnectStressTest, ShutdownCloseSecond) {
}
TEST_P(PersistentListenerConnectStressTest, Close) {
- const int nports = ASSERT_NO_ERRNO_AND_VALUE(NumPorts());
+ const int nports = ASSERT_NO_ERRNO_AND_VALUE(MaybeLimitEphemeralPorts());
for (int i = 0; i < nports * 2; i++) {
std::unique_ptr<SocketPair> sockets =
ASSERT_NO_ERRNO_AND_VALUE(NewSocketSleep());
diff --git a/test/syscalls/linux/socket_inet_loopback_nogotsan.cc b/test/syscalls/linux/socket_inet_loopback_nogotsan.cc
index b131213d4..cc2773af1 100644
--- a/test/syscalls/linux/socket_inet_loopback_nogotsan.cc
+++ b/test/syscalls/linux/socket_inet_loopback_nogotsan.cc
@@ -104,16 +104,25 @@ INSTANTIATE_TEST_SUITE_P(All, SocketInetLoopbackTest,
using SocketMultiProtocolInetLoopbackTest =
::testing::TestWithParam<ProtocolTestParam>;
-TEST_P(SocketMultiProtocolInetLoopbackTest, BindAvoidsListeningPortsReuseAddr) {
+TEST_P(SocketMultiProtocolInetLoopbackTest,
+ TCPBindAvoidsOtherBoundPortsReuseAddr) {
ProtocolTestParam const& param = GetParam();
- // UDP sockets are allowed to bind/listen on the port w/ SO_REUSEADDR, for TCP
- // this is only permitted if there is no other listening socket.
+ // UDP sockets are allowed to bind/listen on an already bound port w/
+ // SO_REUSEADDR even when requesting a port from the kernel. In case of TCP
+ // rebinding is only permitted when SO_REUSEADDR is set and an explicit port
+ // is specified. When a zero port is specified to the bind() call then an
+ // already bound port will not be picked.
SKIP_IF(param.type != SOCK_STREAM);
DisableSave ds; // Too many syscalls.
// A map of port to file descriptor binding the port.
- std::map<uint16_t, FileDescriptor> listen_sockets;
+ std::map<uint16_t, FileDescriptor> bound_sockets;
+
+ // Reduce number of ephemeral ports if permitted to reduce running time of
+ // the test.
+ [[maybe_unused]] const int nports =
+ ASSERT_NO_ERRNO_AND_VALUE(MaybeLimitEphemeralPorts());
// Exhaust all ephemeral ports.
while (true) {
@@ -139,12 +148,59 @@ TEST_P(SocketMultiProtocolInetLoopbackTest, BindAvoidsListeningPortsReuseAddr) {
SyscallSucceeds());
uint16_t port = reinterpret_cast<sockaddr_in*>(&bound_addr)->sin_port;
- // Newly bound port should not already be in use by a listening socket.
- ASSERT_EQ(listen_sockets.find(port), listen_sockets.end());
- auto fd = bound_fd.get();
- listen_sockets.insert(std::make_pair(port, std::move(bound_fd)));
- ASSERT_THAT(listen(fd, SOMAXCONN), SyscallSucceeds());
+ auto [iter, inserted] = bound_sockets.emplace(port, std::move(bound_fd));
+ ASSERT_TRUE(inserted);
+ }
+}
+
+TEST_P(SocketMultiProtocolInetLoopbackTest,
+ UDPBindMayBindOtherBoundPortsReuseAddr) {
+ ProtocolTestParam const& param = GetParam();
+ // UDP sockets are allowed to bind/listen on an already bound port w/
+ // SO_REUSEADDR even when requesting a port from the kernel.
+ SKIP_IF(param.type != SOCK_DGRAM);
+
+ DisableSave ds; // Too many syscalls.
+
+ // A map of port to file descriptor binding the port.
+ std::map<uint16_t, FileDescriptor> bound_sockets;
+
+ // Reduce number of ephemeral ports if permitted to reduce running time of
+ // the test.
+ [[maybe_unused]] const int nports =
+ ASSERT_NO_ERRNO_AND_VALUE(MaybeLimitEphemeralPorts());
+
+ // Exhaust all ephemeral ports.
+ bool duplicate_binding = false;
+ while (true) {
+ // Bind the v4 loopback on a v4 socket.
+ TestAddress const& test_addr = V4Loopback();
+ sockaddr_storage bound_addr = test_addr.addr;
+ FileDescriptor bound_fd =
+ ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
+
+ ASSERT_THAT(setsockopt(bound_fd.get(), SOL_SOCKET, SO_REUSEADDR,
+ &kSockOptOn, sizeof(kSockOptOn)),
+ SyscallSucceeds());
+
+ ASSERT_THAT(
+ bind(bound_fd.get(), AsSockAddr(&bound_addr), test_addr.addr_len),
+ SyscallSucceeds());
+
+ // Get the port that we bound.
+ socklen_t bound_addr_len = test_addr.addr_len;
+ ASSERT_THAT(
+ getsockname(bound_fd.get(), AsSockAddr(&bound_addr), &bound_addr_len),
+ SyscallSucceeds());
+ uint16_t port = reinterpret_cast<sockaddr_in*>(&bound_addr)->sin_port;
+
+ auto [iter, inserted] = bound_sockets.emplace(port, std::move(bound_fd));
+ if (!inserted) {
+ duplicate_binding = true;
+ break;
+ }
}
+ ASSERT_TRUE(duplicate_binding);
}
INSTANTIATE_TEST_SUITE_P(AllFamilies, SocketMultiProtocolInetLoopbackTest,
diff --git a/test/syscalls/linux/socket_test_util.cc b/test/syscalls/linux/socket_test_util.cc
index 5e36472b4..1afb1ab50 100644
--- a/test/syscalls/linux/socket_test_util.cc
+++ b/test/syscalls/linux/socket_test_util.cc
@@ -24,6 +24,7 @@
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
#include "absl/time/clock.h"
#include "absl/types/optional.h"
#include "test/util/file_descriptor.h"
@@ -1067,5 +1068,43 @@ void SetupTimeWaitClose(const TestAddress* listener,
absl::SleepFor(absl::Seconds(1));
}
+constexpr char kRangeFile[] = "/proc/sys/net/ipv4/ip_local_port_range";
+
+PosixErrorOr<int> MaybeLimitEphemeralPorts() {
+ int min = 0;
+ int max = 1 << 16;
+
+ // Read the ephemeral range from /proc.
+ ASSIGN_OR_RETURN_ERRNO(std::string rangefile, GetContents(kRangeFile));
+ const std::string err_msg =
+ absl::StrFormat("%s has invalid content: %s", kRangeFile, rangefile);
+ if (rangefile.back() != '\n') {
+ return PosixError(EINVAL, err_msg);
+ }
+ rangefile.pop_back();
+ std::vector<std::string> range =
+ absl::StrSplit(rangefile, absl::ByAnyChar("\t "));
+ if (range.size() < 2 || !absl::SimpleAtoi(range.front(), &min) ||
+ !absl::SimpleAtoi(range.back(), &max)) {
+ return PosixError(EINVAL, err_msg);
+ }
+
+ // If we can open as writable, limit the range.
+ if (!access(kRangeFile, W_OK)) {
+ ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd,
+ Open(kRangeFile, O_WRONLY | O_TRUNC, 0));
+ max = min + 50;
+ const std::string small_range = absl::StrFormat("%d %d", min, max);
+ int n = write(fd.get(), small_range.c_str(), small_range.size());
+ if (n < 0) {
+ return PosixError(
+ errno,
+ absl::StrFormat("write(%d [%s], \"%s\", %d)", fd.get(), kRangeFile,
+ small_range.c_str(), small_range.size()));
+ }
+ }
+ return max - min;
+}
+
} // namespace testing
} // namespace gvisor
diff --git a/test/syscalls/linux/socket_test_util.h b/test/syscalls/linux/socket_test_util.h
index df4c26f26..0e2be63cc 100644
--- a/test/syscalls/linux/socket_test_util.h
+++ b/test/syscalls/linux/socket_test_util.h
@@ -576,6 +576,10 @@ void SetupTimeWaitClose(const TestAddress* listener,
bool accept_close, sockaddr_storage* listen_addr,
sockaddr_storage* conn_bound_addr);
+// MaybeLimitEphemeralPorts attempts to reduce the number of ephemeral ports and
+// returns the number of ephemeral ports.
+PosixErrorOr<int> MaybeLimitEphemeralPorts();
+
namespace internal {
PosixErrorOr<int> TryPortAvailable(int port, AddressFamily family,
SocketType type, bool reuse_addr);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 02:03:54 +0000