svn commit: r361961 - user/pho/stress2/misc
Peter Holm
pho at FreeBSD.org
Tue Jun 9 06:48:26 UTC 2020
Author: pho
Date: Tue Jun 9 06:48:25 2020
New Revision: 361961
URL: https://svnweb.freebsd.org/changeset/base/361961
Log:
Added a syzkaller reproducer.
Added:
user/pho/stress2/misc/syzkaller14.sh (contents, props changed)
Added: user/pho/stress2/misc/syzkaller14.sh
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ user/pho/stress2/misc/syzkaller14.sh Tue Jun 9 06:48:25 2020 (r361961)
@@ -0,0 +1,297 @@
+#!/bin/sh
+
+# panic: mtx_lock() of spin mutex (null) @ ../../../kern/uipc_ktls.c:1034
+# cpuid = 5
+# time = 1591684934
+# KDB: stack backtrace:
+# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe013a91b6c0
+# vpanic() at vpanic+0x182/frame 0xfffffe013a91b710
+# panic() at panic+0x43/frame 0xfffffe013a91b770
+# __mtx_lock_flags() at __mtx_lock_flags+0x13c/frame 0xfffffe013a91b7c0
+# ktls_get_rx_mode() at ktls_get_rx_mode+0x4e/frame 0xfffffe013a91b7f0
+# tcp_default_ctloutput() at tcp_default_ctloutput+0x800/frame 0xfffffe013a91b960
+# tcp_ctloutput() at tcp_ctloutput+0x1f5/frame 0xfffffe013a91b9d0
+# sogetopt() at sogetopt+0x101/frame 0xfffffe013a91ba40
+# kern_getsockopt() at kern_getsockopt+0xb4/frame 0xfffffe013a91baa0
+# sys_getsockopt() at sys_getsockopt+0x52/frame 0xfffffe013a91bad0
+# amd64_syscall() at amd64_syscall+0x159/frame 0xfffffe013a91bbf0
+# fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe013a91bbf0
+# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x80045446a, rsp = 0x7fffdffdcf88, rbp = 0x7fffdffdcfc0 ---
+# KDB: enter: panic
+# [ thread pid 5313 tid 101679 ]
+# Stopped at kdb_enter+0x37: movq $0,0x10c7fa6(%rip)
+# db> x/s version
+# version: FreeBSD 13.0-CURRENT #0 r361886: Tue Jun 9 08:32:24 CEST 2020\012 pho at t2.osted.lan:/usr/src/sys/amd64/compile/KTLS\012
+# db>
+
+# $FreeBSD$
+
+# Reproduced on r361886 with "options KERN_TLS"
+
+[ `uname -p` = "i386" ] && exit 0
+
+. ../default.cfg
+cat > /tmp/syzkaller14.c <<EOF
+// https://syzkaller.appspot.com/bug?id=d50164ce557a20a785510aac5d6f104d8a62e779
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+// Reported-by: syzbot+a8829e888a93a4a04619 at syzkaller.appspotmail.com
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <pthread.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/endian.h>
+#include <sys/syscall.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+
+static unsigned long long procid;
+
+static void kill_and_wait(int pid, int* status)
+{
+ kill(pid, SIGKILL);
+ while (waitpid(-1, status, 0) != pid) {
+ }
+}
+
+static void sleep_ms(uint64_t ms)
+{
+ usleep(ms * 1000);
+}
+
+static uint64_t current_time_ms(void)
+{
+ struct timespec ts;
+ if (clock_gettime(CLOCK_MONOTONIC, &ts))
+ exit(1);
+ return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
+}
+
+static void thread_start(void* (*fn)(void*), void* arg)
+{
+ pthread_t th;
+ pthread_attr_t attr;
+ pthread_attr_init(&attr);
+ pthread_attr_setstacksize(&attr, 128 << 10);
+ int i;
+ for (i = 0; i < 100; i++) {
+ if (pthread_create(&th, &attr, fn, arg) == 0) {
+ pthread_attr_destroy(&attr);
+ return;
+ }
+ if (errno == EAGAIN) {
+ usleep(50);
+ continue;
+ }
+ break;
+ }
+ exit(1);
+}
+
+typedef struct {
+ pthread_mutex_t mu;
+ pthread_cond_t cv;
+ int state;
+} event_t;
+
+static void event_init(event_t* ev)
+{
+ if (pthread_mutex_init(&ev->mu, 0))
+ exit(1);
+ if (pthread_cond_init(&ev->cv, 0))
+ exit(1);
+ ev->state = 0;
+}
+
+static void event_reset(event_t* ev)
+{
+ ev->state = 0;
+}
+
+static void event_set(event_t* ev)
+{
+ pthread_mutex_lock(&ev->mu);
+ if (ev->state)
+ exit(1);
+ ev->state = 1;
+ pthread_mutex_unlock(&ev->mu);
+ pthread_cond_broadcast(&ev->cv);
+}
+
+static void event_wait(event_t* ev)
+{
+ pthread_mutex_lock(&ev->mu);
+ while (!ev->state)
+ pthread_cond_wait(&ev->cv, &ev->mu);
+ pthread_mutex_unlock(&ev->mu);
+}
+
+static int event_isset(event_t* ev)
+{
+ pthread_mutex_lock(&ev->mu);
+ int res = ev->state;
+ pthread_mutex_unlock(&ev->mu);
+ return res;
+}
+
+static int event_timedwait(event_t* ev, uint64_t timeout)
+{
+ uint64_t start = current_time_ms();
+ uint64_t now = start;
+ pthread_mutex_lock(&ev->mu);
+ for (;;) {
+ if (ev->state)
+ break;
+ uint64_t remain = timeout - (now - start);
+ struct timespec ts;
+ ts.tv_sec = remain / 1000;
+ ts.tv_nsec = (remain % 1000) * 1000 * 1000;
+ pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
+ now = current_time_ms();
+ if (now - start > timeout)
+ break;
+ }
+ int res = ev->state;
+ pthread_mutex_unlock(&ev->mu);
+ return res;
+}
+
+struct thread_t {
+ int created, call;
+ event_t ready, done;
+};
+
+static struct thread_t threads[16];
+static void execute_call(int call);
+static int running;
+
+static void* thr(void* arg)
+{
+ struct thread_t* th = (struct thread_t*)arg;
+ for (;;) {
+ event_wait(&th->ready);
+ event_reset(&th->ready);
+ execute_call(th->call);
+ __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
+ event_set(&th->done);
+ }
+ return 0;
+}
+
+static void execute_one(void)
+{
+ int i, call, thread;
+ int collide = 0;
+again:
+ for (call = 0; call < 3; call++) {
+ for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
+ thread++) {
+ struct thread_t* th = &threads[thread];
+ if (!th->created) {
+ th->created = 1;
+ event_init(&th->ready);
+ event_init(&th->done);
+ event_set(&th->done);
+ thread_start(thr, th);
+ }
+ if (!event_isset(&th->done))
+ continue;
+ event_reset(&th->done);
+ th->call = call;
+ __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
+ event_set(&th->ready);
+ if (collide && (call % 2) == 0)
+ break;
+ event_timedwait(&th->done, 45);
+ break;
+ }
+ }
+ for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
+ sleep_ms(1);
+ if (!collide) {
+ collide = 1;
+ goto again;
+ }
+}
+
+static void execute_one(void);
+
+#define WAIT_FLAGS 0
+
+static void loop(void)
+{
+ int iter;
+ for (iter = 0;; iter++) {
+ int pid = fork();
+ if (pid < 0)
+ exit(1);
+ if (pid == 0) {
+ execute_one();
+ exit(0);
+ }
+ int status = 0;
+ uint64_t start = current_time_ms();
+ for (;;) {
+ if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
+ break;
+ sleep_ms(1);
+ if (current_time_ms() - start < 5 * 1000)
+ continue;
+ kill_and_wait(pid, &status);
+ break;
+ }
+ }
+}
+
+uint64_t r[1] = {0xffffffffffffffff};
+
+void execute_call(int call)
+{
+ intptr_t res = 0;
+ switch (call) {
+ case 0:
+ res = syscall(SYS_socket, 0x1cul, 1ul, 0);
+ if (res != -1)
+ r[0] = res;
+ break;
+ case 1:
+ syscall(SYS_getsockopt, r[0], 6, 0x2a, 0ul, 0ul);
+ break;
+ case 2:
+ syscall(SYS_listen, r[0], 1);
+ break;
+ }
+}
+int main(void)
+{
+ syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
+ for (procid = 0; procid < 4; procid++) {
+ if (fork() == 0) {
+ loop();
+ }
+ }
+ sleep(1000000);
+ return 0;
+}
+EOF
+mycc -o /tmp/syzkaller14 -Wall -Wextra -O2 /tmp/syzkaller14.c -lpthread ||
+ exit 1
+
+(cd /tmp; ./syzkaller14) &
+sleep 60
+pkill -9 syzkaller14
+wait
+
+rm -f /tmp/syzkaller14 /tmp/syzkaller14.c /tmp/syzkaller14.core
+exit 0
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