From owner-svn-src-user@freebsd.org Tue Aug 25 05:15:41 2020 Return-Path: Delivered-To: svn-src-user@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 769763BE4EB for ; Tue, 25 Aug 2020 05:15:41 +0000 (UTC) (envelope-from pho@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BbHJF2Z3Zz3bGw; Tue, 25 Aug 2020 05:15:41 +0000 (UTC) (envelope-from pho@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 3B29B24771; Tue, 25 Aug 2020 05:15:41 +0000 (UTC) (envelope-from pho@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 07P5FfTg051760; Tue, 25 Aug 2020 05:15:41 GMT (envelope-from pho@FreeBSD.org) Received: (from pho@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 07P5Ffba051759; Tue, 25 Aug 2020 05:15:41 GMT (envelope-from pho@FreeBSD.org) Message-Id: <202008250515.07P5Ffba051759@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: pho set sender to pho@FreeBSD.org using -f From: Peter Holm Date: Tue, 25 Aug 2020 05:15:41 +0000 (UTC) To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r364752 - user/pho/stress2/misc X-SVN-Group: user X-SVN-Commit-Author: pho X-SVN-Commit-Paths: user/pho/stress2/misc X-SVN-Commit-Revision: 364752 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-user@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: "SVN commit messages for the experimental " user" src tree" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Aug 2020 05:15:41 -0000 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 < +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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