Re: UBSan: Undefined Behavior in compat_ifconf

[syzbot <syzbot+4c87d0cdf7025741ea7a%syzkaller.appspotmail.com@localhost>]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to create VM pool: failed to create GCE image: create image operation failed: &{Code:PERMISSIONS_ERROR Location: Message:Required 'read' permission for 'disks/ci2-netbsd-kubsan-test-job-test-job-image.tar.gz' ForceSendFields:[] NullFields:[]}.

syzkaller build log:
go env (err=<nil>)
GO111MODULE="auto"
GOARCH="amd64"
GOBIN=""
GOCACHE="/syzkaller/.cache/go-build"
GOENV="/syzkaller/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/syzkaller/jobs/netbsd/gopath/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/syzkaller/jobs/netbsd/gopath"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct";
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/syzkaller/jobs/netbsd/gopath/src/github.com/google/syzkaller/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2797743485=/tmp/go-build -gno-record-gcc-switches"

git status (err=<nil>)
HEAD detached at bff65f44b
nothing to commit, working tree clean


go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
bin/syz-sysgen
touch .descriptions
GOOS=netbsd GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=bff65f44b47bd73f56c3d6a5c3899de5f5775136 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20220704-135716'" "-tags=syz_target syz_os_netbsd syz_arch_amd64 " -o ./bin/netbsd_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=netbsd GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=bff65f44b47bd73f56c3d6a5c3899de5f5775136 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20220704-135716'" "-tags=syz_target syz_os_netbsd syz_arch_amd64 " -o ./bin/netbsd_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=netbsd GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=bff65f44b47bd73f56c3d6a5c3899de5f5775136 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20220704-135716'" "-tags=syz_target syz_os_netbsd syz_arch_amd64 " -o ./bin/netbsd_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/netbsd_amd64
/syzkaller/shared/netbsd/tools/bin/x86_64--netbsd-g++ -o ./bin/netbsd_amd64/syz-executor executor/executor.cc \
	-m64 --sysroot /syzkaller/shared/netbsd/dest/ -O2 -pthread -Wall -Werror -Wparentheses -Wframe-larger-than=16384 -fpermissive -w -DGOOS_netbsd=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"bff65f44b47bd73f56c3d6a5c3899de5f5775136\"



Tested on:

commit:         2f5de0fa Convert CTASSERT(9) for PAGE_{SIZE,MASK} into..
git tree:       https://github.com/NetBSD/src trunk
kernel config:  https://syzkaller.appspot.com/x/.config?x=1420f906d33d9f1f
dashboard link: https://syzkaller.appspot.com/bug?extid=4c87d0cdf7025741ea7a
compiler:       g++ (Debian 10.2.1-6) 10.2.1 20210110
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10b30384080000

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