1#!/bin/sh 2 3# Fatal trap 12: page fault while in kernel mode 4# cpuid = 0; apic id = 00 5# fault virtual address = 0x18 6# fault code = supervisor read data, page not present 7# instruction pointer = 0x20:0xffffffff80ffe995 8# stack pointer = 0x28:0xfffffe0015e1d6f0 9# frame pointer = 0x28:0xfffffe0015e1d720 10# code segment = base 0x0, limit 0xfffff, type 0x1b 11# = DPL 0, pres 1, long 1, def32 0, gran 1 12# processor eflags = interrupt enabled, resume, IOPL = 0 13# current process = 744 (syz-executor7538254) 14# trap number = 12 15# panic: page fault 16# cpuid = 0 17# time = 1575776142 18# KDB: stack backtrace: 19# db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0015e1d2f0 20# vpanic() at vpanic+0x1c7/frame 0xfffffe0015e1d360 21# panic() at panic+0x43/frame 0xfffffe0015e1d3c0 22# trap_fatal() at trap_fatal+0x4cc/frame 0xfffffe0015e1d440 23# trap_pfault() at trap_pfault+0xdc/frame 0xfffffe0015e1d4e0 24# trap() at trap+0x441/frame 0xfffffe0015e1d620 25# calltrap() at calltrap+0x8/frame 0xfffffe0015e1d620 26# --- trap 0xc, rip = 0xffffffff80ffe995, rsp = 0xfffffe0015e1d6f0, rbp = 0xfffffe0015e1d720 --- 27# __mtx_assert() at __mtx_assert+0x85/frame 0xfffffe0015e1d720 28# uipc_send() at uipc_send+0xeec/frame 0xfffffe0015e1d810 29# sosend_generic() at sosend_generic+0x707/frame 0xfffffe0015e1d8d0 30# sosend() at sosend+0xc6/frame 0xfffffe0015e1d940 31# kern_sendit() at kern_sendit+0x32d/frame 0xfffffe0015e1d9f0 32# sendit() at sendit+0x226/frame 0xfffffe0015e1da50 33# sys_sendmsg() at sys_sendmsg+0x8b/frame 0xfffffe0015e1dab0 34# amd64_syscall() at amd64_syscall+0x46d/frame 0xfffffe0015e1dbf0 35# fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0015e1dbf0 36# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x41c3ea, rsp = 0x7fffffffeb98, rbp = 0x7fffffffebf0 --- 37 38# Reproduced on r359818 39# Fixed by r359893 40 41[ `uname -p` = "i386" ] && exit 0 42 43. ../default.cfg 44cat > /tmp/syzkaller9.c <<EOF 45// http://syzkaller.backtrace.io:8080/report?id=03a08d05681c3e7f38ab6ab3f0d025105c3dcea3 46// autogenerated by syzkaller (https://github.com/google/syzkaller) 47 48#define _GNU_SOURCE 49 50#include <pwd.h> 51#include <stdarg.h> 52#include <stdbool.h> 53#include <stdint.h> 54#include <stdio.h> 55#include <stdlib.h> 56#include <string.h> 57#include <sys/endian.h> 58#include <sys/syscall.h> 59#include <unistd.h> 60 61uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; 62 63int main(void) 64{ 65 syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul); 66 intptr_t res = 0; 67 res = syscall(SYS_socket, 1ul, 5ul, 0ul); 68 if (res != -1) 69 r[0] = res; 70 memcpy((void*)0x20000000, "\x1d\x01\x2e\x2f\x66\x69\x6c\x65\x30\x00", 10); 71 syscall(SYS_bind, r[0], 0x20000000ul, 0xaul); 72 syscall(SYS_listen, r[0], 0); 73 res = syscall(SYS_socket, 1ul, 5ul, 0ul); 74 if (res != -1) 75 r[1] = res; 76 *(uint64_t*)0x20002640 = 0x20000000; 77 *(uint8_t*)0x20000000 = 0xa; 78 *(uint8_t*)0x20000001 = 1; 79 memcpy((void*)0x20000002, "./file0\000", 8); 80 *(uint32_t*)0x20002648 = 0xa; 81 *(uint64_t*)0x20002650 = 0; 82 *(uint64_t*)0x20002658 = 0; 83 *(uint64_t*)0x20002660 = 0x20002580; 84 memcpy((void*)0x20002580, 85 "\x10\x00\x00\x00\xff\xff\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00", 86 16); 87 *(uint64_t*)0x20002668 = 0x10; 88 *(uint32_t*)0x20002670 = 0; 89 syscall(SYS_sendmsg, r[1], 0x20002640ul, 0ul); 90 return 0; 91} 92EOF 93mycc -o /tmp/syzkaller9 -Wall -Wextra -O2 /tmp/syzkaller9.c -lpthread || 94 exit 1 95 96(cd /tmp; ./syzkaller9) & 97sleep 60 98pkill -9 syzkaller9 99wait 100 101rm -f /tmp/syzkaller9 /tmp/syzkaller9.c /tmp/syzkaller9.core /tmp/file0 102exit 0 103