svn commit: r363826 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Tue Aug  4 06:37:16 2020
New Revision: 363826
URL: https://svnweb.freebsd.org/changeset/base/363826

Log:
  Added a new syzkaller reproducer.
  
  Obtained from:	markj@

Added:
  user/pho/stress2/misc/syzkaller20.sh   (contents, props changed)

Added: user/pho/stress2/misc/syzkaller20.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/syzkaller20.sh	Tue Aug  4 06:37:16 2020	(r363826)
@@ -0,0 +1,110 @@
+#!/bin/sh
+
+# Fatal trap 12: page fault while in kernel mode
+# cpuid = 0; apic id = 00
+# fault virtual address   = 0x70
+# fault code              = supervisor read data, page not present
+# instruction pointer     = 0x20:0xffffffff80dec3cf
+# stack pointer           = 0x28:0xfffffe013c9384d0
+# frame pointer           = 0x28:0xfffffe013c938510
+# 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         = 58092 (syzkaller20)
+# trap number             = 12
+# panic: page fault
+# cpuid = 0
+# time = 1596109014
+# KDB: stack backtrace:
+# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe013c938180
+# vpanic() at vpanic+0x182/frame 0xfffffe013c9381d0
+# panic() at panic+0x43/frame 0xfffffe013c938230
+# trap_fatal() at trap_fatal+0x387/frame 0xfffffe013c938290
+# trap_pfault() at trap_pfault+0x99/frame 0xfffffe013c9382f0
+# trap() at trap+0x2a5/frame 0xfffffe013c938400
+# calltrap() at calltrap+0x8/frame 0xfffffe013c938400
+# --- trap 0xc, rip = 0xffffffff80dec3cf, rsp = 0xfffffe013c9384d0, rbp = 0xfffffe013c938510 ---
+# in6_setscope() at in6_setscope+0x5f/frame 0xfffffe013c938510
+# ip6_output() at ip6_output+0x103c/frame 0xfffffe013c938750
+# udp6_send() at udp6_send+0x79b/frame 0xfffffe013c938900
+# sosend_dgram() at sosend_dgram+0x34e/frame 0xfffffe013c938960
+# sosend() at sosend+0x66/frame 0xfffffe013c938990
+# kern_sendit() at kern_sendit+0x246/frame 0xfffffe013c938a30
+# sendit() at sendit+0x1d8/frame 0xfffffe013c938a80
+# sys_sendto() at sys_sendto+0x4d/frame 0xfffffe013c938ad0
+# amd64_syscall() at amd64_syscall+0x159/frame 0xfffffe013c938bf0
+# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe013c938bf0
+# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x80045513a, rsp = 0x7fffffffe568, rbp = 0x7fffffffe580 ---
+# KDB: enter: panic
+# [ thread pid 58092 tid 100337 ]
+# Stopped at      kdb_enter+0x37: movq    $0,0x10b8de6(%rip)
+# db> x/s version
+# version:        FreeBSD 13.0-CURRENT #0 r363687: Thu Jul 30 08:55:21 CEST 2020
+# pho at t2.osted.lan:/usr/src/sys/amd64/compile/PHO
+# db>
+
+# $FreeBSD$
+
+[ `uname -p` != "amd64" ] && exit 0
+
+. ../default.cfg
+cat > /tmp/syzkaller20.c <<EOF
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+
+#define _GNU_SOURCE
+
+#include <pwd.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 <unistd.h>
+
+uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
+
+int main(void)
+{
+  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
+  intptr_t res = 0;
+  res = syscall(SYS_socket, 0x1cul, 1ul, 0);
+  if (res != -1)
+    r[0] = res;
+  res = syscall(SYS_socket, 0x1cul, 2ul, 0x88);
+  if (res != -1)
+    r[1] = res;
+  syscall(SYS_dup2, r[1], r[0]);
+  *(uint8_t*)0x20000000 = 0x1c;
+  *(uint8_t*)0x20000001 = 0x1c;
+  *(uint16_t*)0x20000002 = htobe16(0x4e21);
+  *(uint32_t*)0x20000004 = 0;
+  *(uint64_t*)0x20000008 = htobe64(0);
+  *(uint64_t*)0x20000010 = htobe64(1);
+  *(uint32_t*)0x20000018 = 0;
+  syscall(SYS_bind, r[0], 0x20000000ul, 0x1cul);
+  *(uint8_t*)0x200002c0 = 0x1c;
+  *(uint8_t*)0x200002c1 = 0x1c;
+  *(uint16_t*)0x200002c2 = htobe16(0x4e23);
+  *(uint32_t*)0x200002c4 = 0;
+  memcpy((void*)0x200002c8,
+         "\xff\x71\x4e\x39\x01\x68\x0f\x3c\xd3\x1d\xb7\x61\x2c\x26\x8b\xac",
+         16);
+  *(uint32_t*)0x200002d8 = 0;
+  syscall(SYS_sendto, r[0], 0ul, 0ul, 0ul, 0x200002c0ul, 0x1cul);
+  return 0;
+}
+EOF
+mycc -o /tmp/syzkaller20 -Wall -Wextra -O2 /tmp/syzkaller20.c -lpthread ||
+    exit 1
+
+(cd ../testcases/swap; ./swap -t 1m -i 20 -h > /dev/null 2>&1) &
+(cd /tmp; ./syzkaller20) &
+sleep 60
+pkill -9 syzkaller20 swap
+wait
+
+rm -f /tmp/syzkaller20 /tmp/syzkaller20.c /tmp/syzkaller20.core
+exit 0