Date: Tue, 4 Aug 2020 06:37:16 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r363826 - user/pho/stress2/misc Message-ID: <202008040637.0746bGDe016991@repo.freebsd.org>
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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@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 0help
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