svn commit: r361004 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Wed May 13 06:45:33 2020
New Revision: 361004
URL: https://svnweb.freebsd.org/changeset/base/361004

Log:
  Added a syzkaller reproducer.

Added:
  user/pho/stress2/misc/syzkaller12.sh   (contents, props changed)

Added: user/pho/stress2/misc/syzkaller12.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/syzkaller12.sh	Wed May 13 06:45:33 2020	(r361004)
@@ -0,0 +1,177 @@
+#!/bin/sh
+
+# Fatal trap 12: page fault while in kernel mode
+# cpuid = 21; apic id = 29
+# fault virtual address   = 0x5eb9977d
+# fault code              = supervisor read data, page not present
+# instruction pointer     = 0x20:0xffffffff80d8f181
+# stack pointer           = 0x28:0xfffffe0126709300
+# frame pointer           = 0x28:0xfffffe0126709750
+# code segment            = base 0x0, limit 0xfffff, type 0x1b
+#                         = DPL 0, pres 1, long 1, def32 0, gran 1
+# processor eflags        = interrupt enabled, resume, IOPL = 0
+# current process         = 12 (swi1: netisr 0)
+# trap number             = 12
+# panic: page fault
+# cpuid = 21
+# time = 1589220309
+# KDB: stack backtrace:
+# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0126708fb0
+# vpanic() at vpanic+0x182/frame 0xfffffe0126709000
+# panic() at panic+0x43/frame 0xfffffe0126709060
+# trap_fatal() at trap_fatal+0x387/frame 0xfffffe01267090c0
+# trap_pfault() at trap_pfault+0x99/frame 0xfffffe0126709120
+# trap() at trap+0x2a5/frame 0xfffffe0126709230
+# calltrap() at calltrap+0x8/frame 0xfffffe0126709230
+# --- trap 0xc, rip = 0xffffffff80d8f181, rsp = 0xfffffe0126709300, rbp = 0xfffffe0126709750 ---
+# sctp_process_control() at sctp_process_control+0x1351/frame 0xfffffe0126709750
+# sctp_common_input_processing() at sctp_common_input_processing+0x4f1/frame 0xfffffe01267098c0
+# sctp6_input_with_port() at sctp6_input_with_port+0x22c/frame 0xfffffe01267099b0
+# sctp6_input() at sctp6_input+0xb/frame 0xfffffe01267099c0
+# ip6_input() at ip6_input+0xe89/frame 0xfffffe0126709aa0
+# swi_net() at swi_net+0x1a1/frame 0xfffffe0126709b20
+# ithread_loop() at ithread_loop+0x279/frame 0xfffffe0126709bb0
+# fork_exit() at fork_exit+0x80/frame 0xfffffe0126709bf0
+# fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0126709bf0
+# --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
+# KDB: enter: panic
+# [ thread pid 12 tid 100083 ]
+# Stopped at      kdb_enter+0x37: movq    $0,0x10ca9a6(%rip)
+# db>
+
+# $FreeBSD$
+
+# Reproduced on r360902
+# Fixed by r360942
+
+[ `uname -p` = "i386" ] && exit 0
+
+. ../default.cfg
+cat > /tmp/syzkaller12.c <<EOF
+// https://syzkaller.appspot.com/bug?id=978bd3a9b4c66b88dd523a3b8b32a1b0aa47ed83
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+
+#define _GNU_SOURCE
+
+#include <sys/types.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 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 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_one(void)
+{
+  intptr_t res = 0;
+  res = syscall(SYS_socket, 0x1cul, 1ul, 0x84);
+  if (res != -1)
+    r[0] = res;
+  *(uint8_t*)0x20000000 = 0x1c;
+  *(uint8_t*)0x20000001 = 0x1c;
+  *(uint16_t*)0x20000002 = htobe16(0x4e22);
+  *(uint32_t*)0x20000004 = 0;
+  *(uint8_t*)0x20000008 = 0;
+  *(uint8_t*)0x20000009 = 0;
+  *(uint8_t*)0x2000000a = 0;
+  *(uint8_t*)0x2000000b = 0;
+  *(uint8_t*)0x2000000c = 0;
+  *(uint8_t*)0x2000000d = 0;
+  *(uint8_t*)0x2000000e = 0;
+  *(uint8_t*)0x2000000f = 0;
+  *(uint8_t*)0x20000010 = 0;
+  *(uint8_t*)0x20000011 = 0;
+  *(uint8_t*)0x20000012 = 0;
+  *(uint8_t*)0x20000013 = 0;
+  *(uint8_t*)0x20000014 = 0;
+  *(uint8_t*)0x20000015 = 0;
+  *(uint8_t*)0x20000016 = 0;
+  *(uint8_t*)0x20000017 = 0;
+  *(uint32_t*)0x20000018 = 0;
+  syscall(SYS_bind, r[0], 0x20000000ul, 0x1cul);
+  *(uint8_t*)0x20000180 = 0x5f;
+  *(uint8_t*)0x20000181 = 0x1c;
+  *(uint16_t*)0x20000182 = htobe16(0x4e22);
+  *(uint32_t*)0x20000184 = 0;
+  *(uint64_t*)0x20000188 = htobe64(0);
+  *(uint64_t*)0x20000190 = htobe64(1);
+  *(uint32_t*)0x20000198 = 0;
+  syscall(SYS_connect, r[0], 0x20000180ul, 0x1cul);
+}
+int main(void)
+{
+  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
+  loop();
+  return 0;
+}
+// https://syzkaller.a
+EOF
+mycc -o /tmp/syzkaller12 -Wall -Wextra -O2 /tmp/syzkaller12.c -lpthread ||
+    exit 1
+
+(cd /tmp; ./syzkaller12) &
+sleep 60
+pkill -9 syzkaller12
+wait
+
+rm -f /tmp/syzkaller12 /tmp/syzkaller12.c /tmp/syzkaller12.core
+exit 0