Date: Tue, 25 Aug 2020 05:15:41 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r364752 - user/pho/stress2/misc Message-ID: <202008250515.07P5Ffba051759@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: pho Date: Tue Aug 25 05:15:40 2020 New Revision: 364752 URL: https://svnweb.freebsd.org/changeset/base/364752 Log: Added a syzkaller reproducer. Added: user/pho/stress2/misc/syzkaller22.sh (contents, props changed) Added: user/pho/stress2/misc/syzkaller22.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/syzkaller22.sh Tue Aug 25 05:15:40 2020 (r364752) @@ -0,0 +1,71 @@ +#!/bin/sh + +# panic: Assertion *buflen >= 2 failed at ../../../kern/vfs_cache.c:2837 +# cpuid = 21 +# time = 1598296274 +# KDB: stack backtrace: +# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0149a9e860 +# vpanic() at vpanic+0x182/frame 0xfffffe0149a9e8b0 +# panic() at panic+0x43/frame 0xfffffe0149a9e910 +# vn_fullpath_any_smr() at vn_fullpath_any_smr+0x4df/frame 0xfffffe0149a9e980 +# sys___realpathat() at sys___realpathat+0x20b/frame 0xfffffe0149a9ead0 +# amd64_syscall() at amd64_syscall+0x159/frame 0xfffffe0149a9ebf0 +# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0149a9ebf0 +# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x8004294ea, rsp = 0x7fffffffe548, rbp = 0x7fffffffe580 --- +# KDB: enter: panic +# [ thread pid 2831 tid 100306 ] +# Stopped at kdb_enter+0x37: movq $0,0x10b4246(%rip) +# db> x/s version +# version: FreeBSD 13.0-CURRENT #0 r364722: Mon Aug 24 21:04:09 CEST 2020 +# pho@t2.osted.lan:/usr/src/sys/amd64/compile/PHO\012 +# db> + +# $FreeBSD$ + +[ `uname -p` != "amd64" ] && exit 0 + +# Obtained from markj (syzkaller). +# Fixed by r364723. + +. ../default.cfg +kldstat -v | grep -q sctp || kldload sctp.ko +cat > /tmp/syzkaller22.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[1] = {0xffffffffffffffff}; + +int main(void) +{ + syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul); + intptr_t res = 0; + memcpy((void*)0x20000000, "./file0\000", 8); + syscall(SYS_open, 0x20000000ul, 0x200645ul, 0ul); + memcpy((void*)0x20000000, ".\000", 2); + res = syscall(SYS_open, 0x20000000ul, 0ul, 0ul); + if (res != -1) + r[0] = res; + memcpy((void*)0x20000240, "./file0\000", 8); + syscall(SYS___realpathat, r[0], 0x20000240ul, 0x20000280ul, 8ul, 0ul); + return 0; +} +EOF +mycc -o /tmp/syzkaller22 -Wall -Wextra -O0 /tmp/syzkaller22.c || + exit 1 + +(cd /tmp; timeout 1m ./syzkaller22) + +rm -f /tmp/syzkaller22 /tmp/syzkaller22.c /tmp/syzkaller22.core /tmp/file0 +exit 0
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202008250515.07P5Ffba051759>