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Message-ID: <20210522063513.GA3094@ubuntu>
Date: Sat, 22 May 2021 08:35:13 +0200
From: John Wood <john.wood@....com>
To: Kees Cook <keescook@...omium.org>, Jann Horn <jannh@...gle.com>,
Jonathan Corbet <corbet@....net>,
James Morris <jmorris@...ei.org>,
"Serge E. Hallyn" <serge@...lyn.com>, Shuah Khan <shuah@...nel.org>
Cc: John Wood <john.wood@....com>, Andi Kleen <ak@...ux.intel.com>,
valdis.kletnieks@...edu,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Randy Dunlap <rdunlap@...radead.org>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-hardening@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH v7 5/7] selftests/brute: Add tests for the Brute LSM
Add tests to check the brute LSM functionality and cover fork/exec brute
force attacks crossing the following privilege boundaries:
1.- setuid process
2.- privilege changes
3.- network to local
Also, as a first step check that fork/exec brute force attacks without
crossing any privilege boundary already commented doesn't trigger the
detection and mitigation stage.
Once a brute force attack is detected, the "test" executable is marked
as "not allowed". To start again a new test, use the "rmxattr" app to
revert this state. This way, all the tests can be run using the same
binary.
Signed-off-by: John Wood <john.wood@....com>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/brute/.gitignore | 2 +
tools/testing/selftests/brute/Makefile | 5 +
tools/testing/selftests/brute/config | 1 +
tools/testing/selftests/brute/rmxattr.c | 34 ++
tools/testing/selftests/brute/test.c | 507 +++++++++++++++++++++++
tools/testing/selftests/brute/test.sh | 256 ++++++++++++
7 files changed, 806 insertions(+)
create mode 100644 tools/testing/selftests/brute/.gitignore
create mode 100644 tools/testing/selftests/brute/Makefile
create mode 100644 tools/testing/selftests/brute/config
create mode 100644 tools/testing/selftests/brute/rmxattr.c
create mode 100644 tools/testing/selftests/brute/test.c
create mode 100755 tools/testing/selftests/brute/test.sh
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index bc3299a20338..5c413a010849 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -2,6 +2,7 @@
TARGETS = arm64
TARGETS += bpf
TARGETS += breakpoints
+TARGETS += brute
TARGETS += capabilities
TARGETS += cgroup
TARGETS += clone3
diff --git a/tools/testing/selftests/brute/.gitignore b/tools/testing/selftests/brute/.gitignore
new file mode 100644
index 000000000000..989894615766
--- /dev/null
+++ b/tools/testing/selftests/brute/.gitignore
@@ -0,0 +1,2 @@
+rmxattr
+test
diff --git a/tools/testing/selftests/brute/Makefile b/tools/testing/selftests/brute/Makefile
new file mode 100644
index 000000000000..c675d1df62ca
--- /dev/null
+++ b/tools/testing/selftests/brute/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+CFLAGS += -Wall -O2
+TEST_PROGS := test.sh
+TEST_GEN_FILES := rmxattr test
+include ../lib.mk
diff --git a/tools/testing/selftests/brute/config b/tools/testing/selftests/brute/config
new file mode 100644
index 000000000000..3587b7bf6c23
--- /dev/null
+++ b/tools/testing/selftests/brute/config
@@ -0,0 +1 @@
+CONFIG_SECURITY_FORK_BRUTE=y
diff --git a/tools/testing/selftests/brute/rmxattr.c b/tools/testing/selftests/brute/rmxattr.c
new file mode 100644
index 000000000000..9ed90409d337
--- /dev/null
+++ b/tools/testing/selftests/brute/rmxattr.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <libgen.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/xattr.h>
+
+static __attribute__((noreturn)) void error_failure(const char *message)
+{
+ perror(message);
+ exit(EXIT_FAILURE);
+}
+
+#define PROG_NAME basename(argv[0])
+
+#define XATTR_SECURITY_PREFIX "security."
+#define XATTR_BRUTE_SUFFIX "brute"
+#define XATTR_NAME_BRUTE XATTR_SECURITY_PREFIX XATTR_BRUTE_SUFFIX
+
+int main(int argc, char **argv)
+{
+ int rc;
+
+ if (argc < 2) {
+ printf("Usage: %s <FILE>\n", PROG_NAME);
+ exit(EXIT_FAILURE);
+ }
+
+ rc = removexattr(argv[1], XATTR_NAME_BRUTE);
+ if (rc)
+ error_failure("removexattr");
+
+ return EXIT_SUCCESS;
+}
diff --git a/tools/testing/selftests/brute/test.c b/tools/testing/selftests/brute/test.c
new file mode 100644
index 000000000000..44c32f446dca
--- /dev/null
+++ b/tools/testing/selftests/brute/test.c
@@ -0,0 +1,507 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <libgen.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+static const char *message = "message";
+
+enum mode {
+ MODE_NONE,
+ MODE_CRASH,
+ MODE_SERVER_CRASH,
+ MODE_CLIENT,
+};
+
+enum crash_after {
+ CRASH_AFTER_NONE,
+ CRASH_AFTER_FORK,
+ CRASH_AFTER_EXEC,
+};
+
+enum signal_from {
+ SIGNAL_FROM_NONE,
+ SIGNAL_FROM_USER,
+ SIGNAL_FROM_KERNEL,
+};
+
+struct args {
+ uint32_t ip;
+ uint16_t port;
+ int counter;
+ long timeout;
+ enum mode mode;
+ enum crash_after crash_after;
+ enum signal_from signal_from;
+ unsigned char has_counter : 1;
+ unsigned char has_change_priv : 1;
+ unsigned char has_ip : 1;
+ unsigned char has_port : 1;
+ unsigned char has_timeout : 1;
+};
+
+#define OPT_STRING "hm:c:s:n:Ca:p:t:"
+
+static void usage(const char *prog)
+{
+ printf("Usage: %s <OPTIONS>\n", prog);
+ printf("OPTIONS:\n");
+ printf(" -h: Show this help and exit. Optional.\n");
+ printf(" -m (crash | server_crash | client): Mode. Required.\n");
+ printf("Options for crash mode:\n");
+ printf(" -c (fork | exec): Crash after. Optional.\n");
+ printf(" -s (user | kernel): Signal from. Required.\n");
+ printf(" -n counter: Number of crashes.\n");
+ printf(" Required if the option -c is used.\n");
+ printf(" Not used without the option -c.\n");
+ printf(" Range from 1 to INT_MAX.\n");
+ printf(" -C: Change privileges before crash. Optional.\n");
+ printf("Options for server_crash mode:\n");
+ printf(" -a ip: Ip v4 address to accept. Required.\n");
+ printf(" -p port: Port number. Required.\n");
+ printf(" Range from 1 to UINT16_MAX.\n");
+ printf(" -t secs: Accept timeout. Required.\n");
+ printf(" Range from 1 to LONG_MAX.\n");
+ printf(" -c (fork | exec): Crash after. Required.\n");
+ printf(" -s (user | kernel): Signal from. Required.\n");
+ printf(" -n counter: Number of crashes. Required.\n");
+ printf(" Range from 1 to INT_MAX.\n");
+ printf("Options for client mode:\n");
+ printf(" -a ip: Ip v4 address to connect. Required.\n");
+ printf(" -p port: Port number. Required.\n");
+ printf(" Range from 1 to UINT16_MAX.\n");
+ printf(" -t secs: Connect timeout. Required.\n");
+ printf(" Range from 1 to LONG_MAX.\n");
+}
+
+static __attribute__((noreturn)) void info_failure(const char *message,
+ const char *prog)
+{
+ printf("%s\n", message);
+ usage(prog);
+ exit(EXIT_FAILURE);
+}
+
+static enum mode get_mode(const char *text, const char *prog)
+{
+ if (!strcmp(text, "crash"))
+ return MODE_CRASH;
+
+ if (!strcmp(text, "server_crash"))
+ return MODE_SERVER_CRASH;
+
+ if (!strcmp(text, "client"))
+ return MODE_CLIENT;
+
+ info_failure("Invalid mode option [-m].", prog);
+}
+
+static enum crash_after get_crash_after(const char *text, const char *prog)
+{
+ if (!strcmp(text, "fork"))
+ return CRASH_AFTER_FORK;
+
+ if (!strcmp(text, "exec"))
+ return CRASH_AFTER_EXEC;
+
+ info_failure("Invalid crash after option [-c].", prog);
+}
+
+static enum signal_from get_signal_from(const char *text, const char *prog)
+{
+ if (!strcmp(text, "user"))
+ return SIGNAL_FROM_USER;
+
+ if (!strcmp(text, "kernel"))
+ return SIGNAL_FROM_KERNEL;
+
+ info_failure("Invalid signal from option [-s]", prog);
+}
+
+static int get_counter(const char *text, const char *prog)
+{
+ int counter;
+
+ counter = atoi(text);
+ if (counter > 0)
+ return counter;
+
+ info_failure("Invalid counter option [-n].", prog);
+}
+
+static __attribute__((noreturn)) void error_failure(const char *message)
+{
+ perror(message);
+ exit(EXIT_FAILURE);
+}
+
+static uint32_t get_ip(const char *text, const char *prog)
+{
+ int ret;
+ uint32_t ip;
+
+ ret = inet_pton(AF_INET, text, &ip);
+ if (!ret)
+ info_failure("Invalid ip option [-a].", prog);
+ else if (ret < 0)
+ error_failure("inet_pton");
+
+ return ip;
+}
+
+static uint16_t get_port(const char *text, const char *prog)
+{
+ long port;
+
+ port = atol(text);
+ if ((port > 0) && (port <= UINT16_MAX))
+ return htons(port);
+
+ info_failure("Invalid port option [-p].", prog);
+}
+
+static long get_timeout(const char *text, const char *prog)
+{
+ long timeout;
+
+ timeout = atol(text);
+ if (timeout > 0)
+ return timeout;
+
+ info_failure("Invalid timeout option [-t].", prog);
+}
+
+static void check_args(const struct args *args, const char *prog)
+{
+ if (args->mode == MODE_CRASH && args->crash_after != CRASH_AFTER_NONE &&
+ args->signal_from != SIGNAL_FROM_NONE && args->has_counter &&
+ !args->has_ip && !args->has_port && !args->has_timeout)
+ return;
+
+ if (args->mode == MODE_CRASH && args->signal_from != SIGNAL_FROM_NONE &&
+ args->crash_after == CRASH_AFTER_NONE && !args->has_counter &&
+ !args->has_ip && !args->has_port && !args->has_timeout)
+ return;
+
+ if (args->mode == MODE_SERVER_CRASH && args->has_ip && args->has_port &&
+ args->has_timeout && args->crash_after != CRASH_AFTER_NONE &&
+ args->signal_from != SIGNAL_FROM_NONE && args->has_counter &&
+ !args->has_change_priv)
+ return;
+
+ if (args->mode == MODE_CLIENT && args->has_ip && args->has_port &&
+ args->has_timeout && args->crash_after == CRASH_AFTER_NONE &&
+ args->signal_from == SIGNAL_FROM_NONE && !args->has_counter &&
+ !args->has_change_priv)
+ return;
+
+ info_failure("Invalid use of options.", prog);
+}
+
+static uid_t get_non_root_uid(void)
+{
+ struct passwd *pwent;
+ uid_t uid;
+
+ while (true) {
+ errno = 0;
+ pwent = getpwent();
+ if (!pwent) {
+ if (errno) {
+ perror("getpwent");
+ endpwent();
+ exit(EXIT_FAILURE);
+ }
+ break;
+ }
+
+ if (pwent->pw_uid) {
+ uid = pwent->pw_uid;
+ endpwent();
+ return uid;
+ }
+ }
+
+ endpwent();
+ printf("A user different of root is needed.\n");
+ exit(EXIT_FAILURE);
+}
+
+static inline void do_sigsegv(void)
+{
+ int *p = NULL;
+ *p = 0;
+}
+
+static void do_sigkill(void)
+{
+ int ret;
+
+ ret = kill(getpid(), SIGKILL);
+ if (ret)
+ error_failure("kill");
+}
+
+static void crash(enum signal_from signal_from, bool change_priv)
+{
+ int ret;
+
+ if (change_priv) {
+ ret = setuid(get_non_root_uid());
+ if (ret)
+ error_failure("setuid");
+ }
+
+ if (signal_from == SIGNAL_FROM_KERNEL)
+ do_sigsegv();
+
+ do_sigkill();
+}
+
+static void execve_crash(char *const argv[])
+{
+ execve(argv[0], argv, NULL);
+ error_failure("execve");
+}
+
+static void exec_crash_user(void)
+{
+ char *const argv[] = {
+ "./test", "-m", "crash", "-s", "user", NULL,
+ };
+
+ execve_crash(argv);
+}
+
+static void exec_crash_user_change_priv(void)
+{
+ char *const argv[] = {
+ "./test", "-m", "crash", "-s", "user", "-C", NULL,
+ };
+
+ execve_crash(argv);
+}
+
+static void exec_crash_kernel(void)
+{
+ char *const argv[] = {
+ "./test", "-m", "crash", "-s", "kernel", NULL,
+ };
+
+ execve_crash(argv);
+}
+
+static void exec_crash_kernel_change_priv(void)
+{
+ char *const argv[] = {
+ "./test", "-m", "crash", "-s", "kernel", "-C", NULL,
+ };
+
+ execve_crash(argv);
+}
+
+static void exec_crash(enum signal_from signal_from, bool change_priv)
+{
+ if (signal_from == SIGNAL_FROM_USER && !change_priv)
+ exec_crash_user();
+ if (signal_from == SIGNAL_FROM_USER && change_priv)
+ exec_crash_user_change_priv();
+ if (signal_from == SIGNAL_FROM_KERNEL && !change_priv)
+ exec_crash_kernel();
+ if (signal_from == SIGNAL_FROM_KERNEL && change_priv)
+ exec_crash_kernel_change_priv();
+}
+
+static void do_crash(enum crash_after crash_after, enum signal_from signal_from,
+ int counter, bool change_priv)
+{
+ pid_t pid;
+ int status;
+
+ if (crash_after == CRASH_AFTER_NONE)
+ crash(signal_from, change_priv);
+
+ while (counter > 0) {
+ pid = fork();
+ if (pid < 0)
+ error_failure("fork");
+
+ /* Child process */
+ if (!pid) {
+ if (crash_after == CRASH_AFTER_FORK)
+ crash(signal_from, change_priv);
+
+ exec_crash(signal_from, change_priv);
+ }
+
+ /* Parent process */
+ counter -= 1;
+ pid = waitpid(pid, &status, 0);
+ if (pid < 0)
+ error_failure("waitpid");
+ }
+}
+
+static __attribute__((noreturn)) void error_close_failure(const char *message,
+ int fd)
+{
+ perror(message);
+ close(fd);
+ exit(EXIT_FAILURE);
+}
+
+static void do_server(uint32_t ip, uint16_t port, long accept_timeout)
+{
+ int sockfd;
+ int ret;
+ struct sockaddr_in address;
+ struct timeval timeout;
+ int newsockfd;
+
+ sockfd = socket(AF_INET, SOCK_STREAM, 0);
+ if (sockfd < 0)
+ error_failure("socket");
+
+ address.sin_family = AF_INET;
+ address.sin_addr.s_addr = ip;
+ address.sin_port = port;
+
+ ret = bind(sockfd, (const struct sockaddr *)&address, sizeof(address));
+ if (ret)
+ error_close_failure("bind", sockfd);
+
+ ret = listen(sockfd, 1);
+ if (ret)
+ error_close_failure("listen", sockfd);
+
+ timeout.tv_sec = accept_timeout;
+ timeout.tv_usec = 0;
+ ret = setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO,
+ (const struct timeval *)&timeout, sizeof(timeout));
+ if (ret)
+ error_close_failure("setsockopt", sockfd);
+
+ newsockfd = accept(sockfd, NULL, NULL);
+ if (newsockfd < 0)
+ error_close_failure("accept", sockfd);
+
+ close(sockfd);
+ close(newsockfd);
+}
+
+static void do_client(uint32_t ip, uint16_t port, long connect_timeout)
+{
+ int sockfd;
+ int ret;
+ struct timeval timeout;
+ struct sockaddr_in address;
+
+ sockfd = socket(AF_INET, SOCK_STREAM, 0);
+ if (sockfd < 0)
+ error_failure("socket");
+
+ timeout.tv_sec = connect_timeout;
+ timeout.tv_usec = 0;
+ ret = setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO,
+ (const struct timeval *)&timeout, sizeof(timeout));
+ if (ret)
+ error_close_failure("setsockopt", sockfd);
+
+ address.sin_family = AF_INET;
+ address.sin_addr.s_addr = ip;
+ address.sin_port = port;
+
+ ret = connect(sockfd, (const struct sockaddr *)&address,
+ sizeof(address));
+ if (ret)
+ error_close_failure("connect", sockfd);
+
+ ret = write(sockfd, message, strlen(message));
+ if (ret < 0)
+ error_close_failure("write", sockfd);
+
+ close(sockfd);
+}
+
+#define PROG_NAME basename(argv[0])
+
+int main(int argc, char **argv)
+{
+ int opt;
+ struct args args = {
+ .mode = MODE_NONE,
+ .crash_after = CRASH_AFTER_NONE,
+ .signal_from = SIGNAL_FROM_NONE,
+ .has_counter = false,
+ .has_change_priv = false,
+ .has_ip = false,
+ .has_port = false,
+ .has_timeout = false,
+ };
+
+ while ((opt = getopt(argc, argv, OPT_STRING)) != -1) {
+ switch (opt) {
+ case 'h':
+ usage(PROG_NAME);
+ return EXIT_SUCCESS;
+ case 'm':
+ args.mode = get_mode(optarg, PROG_NAME);
+ break;
+ case 'c':
+ args.crash_after = get_crash_after(optarg, PROG_NAME);
+ break;
+ case 's':
+ args.signal_from = get_signal_from(optarg, PROG_NAME);
+ break;
+ case 'n':
+ args.counter = get_counter(optarg, PROG_NAME);
+ args.has_counter = true;
+ break;
+ case 'C':
+ args.has_change_priv = true;
+ break;
+ case 'a':
+ args.ip = get_ip(optarg, PROG_NAME);
+ args.has_ip = true;
+ break;
+ case 'p':
+ args.port = get_port(optarg, PROG_NAME);
+ args.has_port = true;
+ break;
+ case 't':
+ args.timeout = get_timeout(optarg, PROG_NAME);
+ args.has_timeout = true;
+ break;
+ default:
+ usage(PROG_NAME);
+ return EXIT_FAILURE;
+ }
+ }
+
+ check_args(&args, PROG_NAME);
+
+ if (args.mode == MODE_CRASH) {
+ do_crash(args.crash_after, args.signal_from, args.counter,
+ args.has_change_priv);
+ } else if (args.mode == MODE_SERVER_CRASH) {
+ do_server(args.ip, args.port, args.timeout);
+ do_crash(args.crash_after, args.signal_from, args.counter,
+ false);
+ } else if (args.mode == MODE_CLIENT) {
+ do_client(args.ip, args.port, args.timeout);
+ }
+
+ return EXIT_SUCCESS;
+}
diff --git a/tools/testing/selftests/brute/test.sh b/tools/testing/selftests/brute/test.sh
new file mode 100755
index 000000000000..47173f38a7c6
--- /dev/null
+++ b/tools/testing/selftests/brute/test.sh
@@ -0,0 +1,256 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+TCID="test.sh"
+
+KSFT_PASS=0
+KSFT_FAIL=1
+KSFT_SKIP=4
+
+errno=$KSFT_PASS
+
+check_root()
+{
+ local uid=$(id -u)
+ if [ $uid -ne 0 ]; then
+ echo $TCID: must be run as root >&2
+ exit $KSFT_SKIP
+ fi
+}
+
+tmp_files_setup()
+{
+ DMESG=$(mktemp --tmpdir -t brute-dmesg-XXXXXX)
+}
+
+tmp_files_cleanup()
+{
+ rm -f "$DMESG"
+}
+
+save_dmesg()
+{
+ dmesg > "$DMESG"
+}
+
+count_attack_matches()
+{
+ dmesg | comm --nocheck-order -13 "$DMESG" - | \
+ grep "brute: fork brute force attack detected" | wc -l
+}
+
+assert_equal()
+{
+ local val1=$1
+ local val2=$2
+
+ if [ $val1 -eq $val2 ]; then
+ echo "$TCID: $message [PASS]"
+ else
+ echo "$TCID: $message [FAIL]"
+ errno=$KSFT_FAIL
+ fi
+}
+
+test_fork_user()
+{
+ COUNTER=20
+
+ save_dmesg
+ ./test -m crash -c fork -s user -n $COUNTER
+ count=$(count_attack_matches)
+
+ message="Fork attack (user signals, no bounds crossed)"
+ assert_equal $count 0
+}
+
+test_fork_kernel()
+{
+ save_dmesg
+ ./test -m crash -c fork -s kernel -n $COUNTER
+ count=$(count_attack_matches)
+
+ message="Fork attack (kernel signals, no bounds crossed)"
+ assert_equal $count 0
+}
+
+test_exec_user()
+{
+ save_dmesg
+ ./test -m crash -c exec -s user -n $COUNTER
+ count=$(count_attack_matches)
+
+ message="Exec attack (user signals, no bounds crossed)"
+ assert_equal $count 0
+}
+
+test_exec_kernel()
+{
+ save_dmesg
+ ./test -m crash -c exec -s kernel -n $COUNTER
+ count=$(count_attack_matches)
+
+ message="Exec attack (kernel signals, no bounds crossed)"
+ assert_equal $count 0
+}
+
+assert_not_equal()
+{
+ local val1=$1
+ local val2=$2
+
+ if [ $val1 -ne $val2 ]; then
+ echo $TCID: $message [PASS]
+ else
+ echo $TCID: $message [FAIL]
+ errno=$KSFT_FAIL
+ fi
+}
+
+remove_xattr()
+{
+ ./rmxattr test >/dev/null 2>&1
+}
+
+test_fork_kernel_setuid()
+{
+ save_dmesg
+ chmod u+s test
+ ./test -m crash -c fork -s kernel -n $COUNTER
+ chmod u-s test
+ count=$(count_attack_matches)
+
+ message="Fork attack (kernel signals, setuid binary)"
+ assert_not_equal $count 0
+ remove_xattr
+}
+
+test_exec_kernel_setuid()
+{
+ save_dmesg
+ chmod u+s test
+ ./test -m crash -c exec -s kernel -n $COUNTER
+ chmod u-s test
+ count=$(count_attack_matches)
+
+ message="Exec attack (kernel signals, setuid binary)"
+ assert_not_equal $count 0
+ remove_xattr
+}
+
+test_fork_kernel_change_priv()
+{
+ save_dmesg
+ ./test -m crash -c fork -s kernel -n $COUNTER -C
+ count=$(count_attack_matches)
+
+ message="Fork attack (kernel signals, change privileges)"
+ assert_not_equal $count 0
+ remove_xattr
+}
+
+test_exec_kernel_change_priv()
+{
+ save_dmesg
+ ./test -m crash -c exec -s kernel -n $COUNTER -C
+ count=$(count_attack_matches)
+
+ message="Exec attack (kernel signals, change privileges)"
+ assert_not_equal $count 0
+ remove_xattr
+}
+
+network_ns_setup()
+{
+ local vnet_name=$1
+ local veth_name=$2
+ local ip_src=$3
+ local ip_dst=$4
+
+ ip netns add $vnet_name
+ ip link set $veth_name netns $vnet_name
+ ip -n $vnet_name addr add $ip_src/24 dev $veth_name
+ ip -n $vnet_name link set $veth_name up
+ ip -n $vnet_name route add $ip_dst/24 dev $veth_name
+}
+
+network_setup()
+{
+ VETH0_NAME=veth0
+ VNET0_NAME=vnet0
+ VNET0_IP=10.0.1.0
+ VETH1_NAME=veth1
+ VNET1_NAME=vnet1
+ VNET1_IP=10.0.2.0
+
+ ip link add $VETH0_NAME type veth peer name $VETH1_NAME
+ network_ns_setup $VNET0_NAME $VETH0_NAME $VNET0_IP $VNET1_IP
+ network_ns_setup $VNET1_NAME $VETH1_NAME $VNET1_IP $VNET0_IP
+}
+
+test_fork_kernel_network_to_local()
+{
+ INADDR_ANY=0.0.0.0
+ PORT=65535
+ TIMEOUT=5
+
+ save_dmesg
+ ip netns exec $VNET0_NAME ./test -m server_crash -a $INADDR_ANY \
+ -p $PORT -t $TIMEOUT -c fork -s kernel -n $COUNTER &
+ sleep 1
+ ip netns exec $VNET1_NAME ./test -m client -a $VNET0_IP -p $PORT \
+ -t $TIMEOUT
+ sleep 1
+ count=$(count_attack_matches)
+
+ message="Fork attack (kernel signals, network to local)"
+ assert_not_equal $count 0
+ remove_xattr
+}
+
+test_exec_kernel_network_to_local()
+{
+ save_dmesg
+ ip netns exec $VNET0_NAME ./test -m server_crash -a $INADDR_ANY \
+ -p $PORT -t $TIMEOUT -c exec -s kernel -n $COUNTER &
+ sleep 1
+ ip netns exec $VNET1_NAME ./test -m client -a $VNET0_IP -p $PORT \
+ -t $TIMEOUT
+ sleep 1
+ count=$(count_attack_matches)
+
+ message="Exec attack (kernel signals, network to local)"
+ assert_not_equal $count 0
+ remove_xattr
+}
+
+network_cleanup()
+{
+ ip netns del $VNET0_NAME >/dev/null 2>&1
+ ip netns del $VNET1_NAME >/dev/null 2>&1
+ ip link delete $VETH0_NAME >/dev/null 2>&1
+ ip link delete $VETH1_NAME >/dev/null 2>&1
+}
+
+cleanup()
+{
+ network_cleanup
+ tmp_files_cleanup
+ remove_xattr
+}
+trap cleanup EXIT
+
+check_root
+tmp_files_setup
+test_fork_user
+test_fork_kernel
+test_exec_user
+test_exec_kernel
+test_fork_kernel_setuid
+test_exec_kernel_setuid
+test_fork_kernel_change_priv
+test_exec_kernel_change_priv
+network_setup
+test_fork_kernel_network_to_local
+test_exec_kernel_network_to_local
+exit $errno
--
2.25.1
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