1#!/bin/sh 2 3# panic: IV outside buffer length 4# cpuid = 22 5# time = 1620355853 6# KDB: stack backtrace: 7# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe01af19d5d0 8# vpanic() at vpanic+0x181/frame 0xfffffe01af19d620 9# panic() at panic+0x43/frame 0xfffffe01af19d680 10# crp_sanity() at crp_sanity+0x212/frame 0xfffffe01af19d6b0 11# crypto_dispatch() at crypto_dispatch+0xf/frame 0xfffffe01af19d6d0 12# crypto_ioctl() at crypto_ioctl+0x18a9/frame 0xfffffe01af19d7e0 13# devfs_ioctl() at devfs_ioctl+0xcd/frame 0xfffffe01af19d830 14# VOP_IOCTL_APV() at VOP_IOCTL_APV+0x59/frame 0xfffffe01af19d850 15# vn_ioctl() at vn_ioctl+0x133/frame 0xfffffe01af19d960 16# devfs_ioctl_f() at devfs_ioctl_f+0x1e/frame 0xfffffe01af19d980 17# kern_ioctl() at kern_ioctl+0x289/frame 0xfffffe01af19d9f0 18# sys_ioctl() at sys_ioctl+0x12a/frame 0xfffffe01af19dac0 19# amd64_syscall() at amd64_syscall+0x147/frame 0xfffffe01af19dbf0 20# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe01af19dbf0 21# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x8003827da, rsp = 0x7fffffffe4f8, rbp = 0x7fffffffe540 --- 22# KDB: enter: panic 23# [ thread pid 2908 tid 100493 ] 24# Stopped at kdb_enter+0x37: movq $0,0x1282a9e(%rip) 25# db> x/s version 26# version: FreeBSD 14.0-CURRENT #1 main-n246506-be578b67b5a: Thu May 6 19:40:29 CEST 2021 27# pho@t2.osted.lan:/usr/src/sys/amd64/compile/PHO 28# db> 29 30[ `uname -p` != "amd64" ] && exit 0 31[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 32 33. ../default.cfg 34cat > /tmp/syzkaller36.c <<EOF 35// https://syzkaller.appspot.com/bug?id=89267af3fd2bf65e173bbb9d69db050f29cba168 36// autogenerated by syzkaller (https://github.com/google/syzkaller) 37// Reported-by: syzbot+c9e8f6ff5cb7fa6a1250@syzkaller.appspotmail.com 38 39#define _GNU_SOURCE 40 41#include <pwd.h> 42#include <stdarg.h> 43#include <stdbool.h> 44#include <stdint.h> 45#include <stdio.h> 46#include <stdlib.h> 47#include <string.h> 48#include <sys/endian.h> 49#include <sys/syscall.h> 50#include <unistd.h> 51 52uint64_t r[1] = {0xffffffffffffffff}; 53 54int main(void) 55{ 56 syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul); 57 intptr_t res = 0; 58 memcpy((void*)0x20000000, "/dev/crypto\000", 12); 59 res = syscall(SYS_openat, 0xffffffffffffff9cul, 0x20000000ul, 0ul, 0ul); 60 if (res != -1) 61 r[0] = res; 62 *(uint32_t*)0x20000440 = 0x17; 63 *(uint32_t*)0x20000444 = 0; 64 *(uint32_t*)0x20000448 = 0x10; 65 *(uint64_t*)0x20000450 = 0x200001c0; 66 memcpy((void*)0x200001c0, 67 "\x3c\x02\x2e\x61\x79\x2e\xec\xb0\x7f\x8a\xee\x18\xe5\xaa\x35\x05", 68 16); 69 *(uint32_t*)0x20000458 = 0; 70 *(uint64_t*)0x20000460 = 0; 71 *(uint32_t*)0x20000468 = 0; 72 *(uint32_t*)0x2000046c = 0xfdffffff; 73 *(uint32_t*)0x20000470 = 0; 74 *(uint32_t*)0x20000474 = 0; 75 *(uint32_t*)0x20000478 = 0; 76 *(uint32_t*)0x2000047c = 0; 77 syscall(SYS_ioctl, r[0], 0xc040636aul, 0x20000440ul); 78 *(uint32_t*)0x20000180 = 0; 79 *(uint16_t*)0x20000184 = 1; 80 *(uint16_t*)0x20000186 = 0; 81 *(uint32_t*)0x20000188 = 7; 82 *(uint64_t*)0x20000190 = 0x20000200; 83 *(uint64_t*)0x20000198 = 0; 84 *(uint64_t*)0x200001a0 = 0; 85 *(uint64_t*)0x200001a8 = 0; 86 syscall(SYS_ioctl, r[0], 0xc0306367ul, 0x20000180ul); 87 return 0; 88} 89EOF 90mycc -o /tmp/syzkaller36 -Wall -Wextra -O0 /tmp/syzkaller36.c || 91 exit 1 92 93kldload cryptodev.ko && loaded=1 94(cd /tmp; timeout 3m ./syzkaller36) 95[ $loaded ] && kldunload cryptodev.ko 96 97rm -rf /tmp/syzkaller36 syzkaller36.c /tmp/syzkaller.* 98exit 0 99