[LTP] [PATCH v5 3/3] Add regression test for CVE-2017-17053
Michael Moese
mmoese@suse.de
Wed Mar 7 09:05:19 CET 2018
This patch adds a regression test for CVE-2017-17053, based on the
reproducer in the message of this commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ccd5b3235180eef3cfec337df1c8554ab151b5cc
Be warned, if the running kernel is vulnerable to this CVE, it will die in
most cases.
Signed-off-by: Michael Moese <mmoese@suse.de>
---
Changes to v4: Reworked after review
---
runtest/cve | 1 +
testcases/cve/.gitignore | 1 +
testcases/cve/Makefile | 1 +
testcases/cve/cve-2017-17053.c | 171 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 174 insertions(+)
create mode 100644 testcases/cve/cve-2017-17053.c
diff --git a/runtest/cve b/runtest/cve
index 6de2ed0ac..6efffc668 100644
--- a/runtest/cve
+++ b/runtest/cve
@@ -29,3 +29,4 @@ cve-2017-17807 request_key04
cve-2017-1000364 stack_clash
cve-2017-5754 meltdown
cve-2017-17052 cve-2017-17052
+cve-2017-17053 cve-2017-17053
diff --git a/testcases/cve/.gitignore b/testcases/cve/.gitignore
index 42f32e825..5ecaaeb76 100644
--- a/testcases/cve/.gitignore
+++ b/testcases/cve/.gitignore
@@ -11,3 +11,4 @@ cve-2017-5669
meltdown
stack_clash
cve-2017-17052
+cve-2017-17053
diff --git a/testcases/cve/Makefile b/testcases/cve/Makefile
index 38ce27c93..00fbc1050 100644
--- a/testcases/cve/Makefile
+++ b/testcases/cve/Makefile
@@ -37,5 +37,6 @@ meltdown: CFLAGS += -msse2
endif
cve-2017-17052: CFLAGS += -pthread
+cve-2017-17053: CFLAGS += -pthread
include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/cve/cve-2017-17053.c b/testcases/cve/cve-2017-17053.c
new file mode 100644
index 000000000..4f9718e19
--- /dev/null
+++ b/testcases/cve/cve-2017-17053.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 2018 Michael Moese <mmoese@suse.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+/* Regression test for CVE-2017-17053, original reproducer can be found
+ * here:
+ * https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ccd5b3235180eef3cfec337df1c8554ab151b5cc
+ *
+ * Be careful! This test may crash your kernel!
+ */
+
+#include <asm/ldt.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <sys/syscall.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include "tst_test.h"
+#include "tst_taint.h"
+#include "lapi/syscalls.h"
+
+#define EXEC_USEC 5000000
+
+static int try_pthread_create(pthread_t *thread_id, const pthread_attr_t *attr,
+ void *(*thread_fn)(void *), void *arg)
+{
+ int rval;
+
+ errno = 0;
+ rval = pthread_create(thread_id, attr, thread_fn, arg);
+
+ if (rval && errno != EAGAIN && errno != EWOULDBLOCK) {
+ tst_brk(TBROK, "pthread_create(%p,%p,%p,%p) failed: %s",
+ thread_id, attr, thread_fn, arg, tst_strerrno(rval));
+ return rval;
+ }
+ return 0;
+}
+
+static int try_fork(void)
+{
+ pid_t pid;
+
+ fflush(stdout);
+
+ pid = fork();
+ errno = 0;
+ if (pid < 0 && errno != EAGAIN && errno == EWOULDBLOCK)
+ tst_brk(TBROK | TERRNO, "fork() failed");
+ return pid;
+}
+
+
+
+struct shm_data {
+ sig_atomic_t do_exit;
+ sig_atomic_t segfaulted;
+};
+static struct shm_data *shm;
+
+static void handler(int sig)
+{
+ (void)(sig);
+
+ shm->segfaulted = 1;
+}
+
+static void install_sighandler(void)
+{
+ struct sigaction sa;
+
+ sa.sa_flags = SA_SIGINFO;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_handler = handler;
+
+ SAFE_SIGACTION(SIGSEGV, &sa, NULL);
+}
+
+static void setup(void)
+{
+ tst_taint_init(TST_TAINT_W | TST_TAINT_D);
+
+ shm = SAFE_MMAP(NULL, sizeof(struct shm_data),
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+}
+
+static void cleanup(void)
+{
+ SAFE_MUNMAP(shm, sizeof(struct shm_data));
+}
+
+static void *fork_thread(void *arg)
+{
+ try_fork();
+ return arg;
+}
+
+void run_test(void)
+{
+ struct user_desc desc = { .entry_number = 8191 };
+
+ install_sighandler();
+ syscall(__NR_modify_ldt, 1, &desc, sizeof(desc));
+
+ for (;;) {
+ if (shm->do_exit)
+ exit(0);
+ else if (shm->segfaulted)
+ exit(-1);
+
+ if (try_fork() == 0) {
+ pthread_t t;
+
+ srand(getpid());
+ errno = 0;
+ if (try_pthread_create(&t, NULL, fork_thread, NULL) != 0)
+ tst_brk(TCONF, "cannot create threads");
+ usleep(rand() % 10000);
+ syscall(__NR_exit_group, 0);
+ }
+ }
+}
+
+void run(void)
+{
+ int status;
+ pid_t pid;
+
+ shm->do_exit = 0;
+ shm->segfaulted = 0;
+ pid = try_fork();
+
+ if (pid == 0) {
+ run_test();
+ } else if (pid > 0) {
+ usleep(EXEC_USEC);
+ shm->do_exit = 1;
+ } else {
+ tst_brk(TCONF, "cannot fork new process");
+ }
+
+ SAFE_WAIT(&status);
+
+ if (WIFEXITED(status) && (shm->segfaulted == 0) && !tst_taint_check())
+ tst_res(TPASS, "kernel survived");
+ else
+ tst_res(TFAIL, "kernel is vulnerable");
+}
+
+static struct tst_test test = {
+ .forks_child = 1,
+ .setup = setup,
+ .cleanup = cleanup,
+ .test_all = run,
+};
--
2.13.6
More information about the ltp
mailing list