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socket_netlink_route: ignore negative port ID values

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netlink_autobind() sets a port id to a process ID, if this address is
available. Otherwise, it will set a port id to a random negative value.

PiperOrigin-RevId: 230631956
Change-Id: I11692e4fe9421e77d9406627b4e7772e4d9b105a
This commit is contained in:
Andrei Vagin
2019-01-23 17:08:48 -08:00
committed by Shentubot
parent 5f08f8fd81
commit af89fb49af
1 changed files with 8 additions and 6 deletions
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test/syscalls/linux/socket_netlink_route.cc
+8 -6
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@@ -17,6 +17,7 @@
#include <linux/rtnetlink.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
#include "gtest/gtest.h"
@@ -100,12 +101,13 @@ TEST(NetlinkRouteTest, ConnectBinds) {
&addrlen),
SyscallSucceeds());
EXPECT_EQ(addrlen, sizeof(addr));
// This is the only netlink socket in the process, so it should get the PID as
// the port id.
//
// N.B. Another process could theoretically have explicitly reserved our pid
// as a port ID, but that is very unlikely.
EXPECT_EQ(addr.nl_pid, getpid());
// Each test is running in a pid namespace, so another process can explicitly
// reserve our pid as a port ID. In this case, a negative portid value will be
// set.
if (static_cast<pid_t>(addr.nl_pid) > 0) {
EXPECT_EQ(addr.nl_pid, getpid());
}
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;