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// SPDX-License-Identifier: GPL-2.0
/* Copyright Amazon.com Inc. or its affiliates. */
#define _GNU_SOURCE
#include <sched.h>
#include <unistd.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/sock_diag.h>
#include <linux/unix_diag.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include "../../kselftest_harness.h"
FIXTURE(diag_uid)
{
int netlink_fd;
int unix_fd;
__u32 inode;
__u64 cookie;
};
FIXTURE_VARIANT(diag_uid)
{
int unshare;
int udiag_show;
};
FIXTURE_VARIANT_ADD(diag_uid, uid)
{
.unshare = 0,
.udiag_show = UDIAG_SHOW_UID
};
FIXTURE_VARIANT_ADD(diag_uid, uid_unshare)
{
.unshare = CLONE_NEWUSER,
.udiag_show = UDIAG_SHOW_UID
};
FIXTURE_SETUP(diag_uid)
{
struct stat file_stat;
socklen_t optlen;
int ret;
if (variant->unshare)
ASSERT_EQ(unshare(variant->unshare), 0);
self->netlink_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
ASSERT_NE(self->netlink_fd, -1);
self->unix_fd = socket(AF_UNIX, SOCK_STREAM, 0);
ASSERT_NE(self->unix_fd, -1);
ret = fstat(self->unix_fd, &file_stat);
ASSERT_EQ(ret, 0);
self->inode = file_stat.st_ino;
optlen = sizeof(self->cookie);
ret = getsockopt(self->unix_fd, SOL_SOCKET, SO_COOKIE, &self->cookie, &optlen);
ASSERT_EQ(ret, 0);
}
FIXTURE_TEARDOWN(diag_uid)
{
close(self->netlink_fd);
close(self->unix_fd);
}
int send_request(struct __test_metadata *_metadata,
FIXTURE_DATA(diag_uid) *self,
const FIXTURE_VARIANT(diag_uid) *variant)
{
struct {
struct nlmsghdr nlh;
struct unix_diag_req udr;
} req = {
.nlh = {
.nlmsg_len = sizeof(req),
.nlmsg_type = SOCK_DIAG_BY_FAMILY,
.nlmsg_flags = NLM_F_REQUEST
},
.udr = {
.sdiag_family = AF_UNIX,
.udiag_ino = self->inode,
.udiag_cookie = {
(__u32)self->cookie,
(__u32)(self->cookie >> 32)
},
.udiag_show = variant->udiag_show
}
};
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK
};
struct iovec iov = {
.iov_base = &req,
.iov_len = sizeof(req)
};
struct msghdr msg = {
.msg_name = &nladdr,
.msg_namelen = sizeof(nladdr),
.msg_iov = &iov,
.msg_iovlen = 1
};
return sendmsg(self->netlink_fd, &msg, 0);
}
void render_response(struct __test_metadata *_metadata,
struct unix_diag_req *udr, __u32 len)
{
unsigned int rta_len = len - NLMSG_LENGTH(sizeof(*udr));
struct rtattr *attr;
uid_t uid;
ASSERT_GT(len, sizeof(*udr));
ASSERT_EQ(udr->sdiag_family, AF_UNIX);
attr = (struct rtattr *)(udr + 1);
ASSERT_NE(RTA_OK(attr, rta_len), 0);
ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
uid = *(uid_t *)RTA_DATA(attr);
ASSERT_EQ(uid, getuid());
}
void receive_response(struct __test_metadata *_metadata,
FIXTURE_DATA(diag_uid) *self)
{
long buf[8192 / sizeof(long)];
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK
};
struct iovec iov = {
.iov_base = buf,
.iov_len = sizeof(buf)
};
struct msghdr msg = {
.msg_name = &nladdr,
.msg_namelen = sizeof(nladdr),
.msg_iov = &iov,
.msg_iovlen = 1
};
struct nlmsghdr *nlh;
int ret;
ret = recvmsg(self->netlink_fd, &msg, 0);
ASSERT_GT(ret, 0);
nlh = (struct nlmsghdr *)buf;
ASSERT_NE(NLMSG_OK(nlh, ret), 0);
ASSERT_EQ(nlh->nlmsg_type, SOCK_DIAG_BY_FAMILY);
render_response(_metadata, NLMSG_DATA(nlh), nlh->nlmsg_len);
nlh = NLMSG_NEXT(nlh, ret);
ASSERT_EQ(NLMSG_OK(nlh, ret), 0);
}
TEST_F(diag_uid, 1)
{
int ret;
ret = send_request(_metadata, self, variant);
ASSERT_GT(ret, 0);
receive_response(_metadata, self);
}
TEST_HARNESS_MAIN
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