Comments (5)
dvyukov
commented on April 28, 2024
On Tue, Jan 31, 2017 at 2:11 PM, Jiri Slaby ***@***.***> wrote:
So since updates to the build system, I can no longer build and use
syzkaller. And I don't understand the messages at all:
$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH=""
GORACE=""
GOROOT="/usr/lib64/go"
GOTOOLDIR="/usr/lib64/go/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build041551092=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
So let's start building:
$ make
make generate
make[1]: Entering directory '/home/latest/repos/syzkaller'
bin/syz-sysgen
generating amd64...
unsupported flag: KVM_ARM_VCPU_POWER_OFF
unsupported flag: KVM_ARM_VCPU_EL1_32BIT
unsupported flag: KVM_ARM_VCPU_PSCI_0_2
unsupported flag: KVM_ARM_VCPU_PMU_V3
unsupported flag: KVM_ARM_TARGET_CORTEX_A53
unsupported flag: KVM_ARM_TARGET_AEM_V8
unsupported flag: KVM_ARM_TARGET_FOUNDATION_V8
unsupported flag: KVM_ARM_TARGET_CORTEX_A57
unsupported flag: KVM_ARM_TARGET_XGENE_POTENZA
unsupported flag: KVM_ARM_TARGET_GENERIC_V8
unsupported flag: KVM_ARM_VCPU_INIT
generating arm64...
unsupported flag: KVM_GET_CPUID2
unsupported flag: PTRACE_GETREGS
and a lot more of these, then it continues:
make[1]: Leaving directory '/home/latest/repos/syzkaller'
go install ./syz-manager ./syz-fuzzer
syz-manager/manager.go:22:2: cannot find package "github.com/google/syzkaller/config" in any of:
/usr/lib64/go/src/github.com/google/syzkaller/config (from $GOROOT)
($GOPATH not set)
syz-manager/cover.go:18:2: cannot find package "github.com/google/syzkaller/cover" in any of:
/usr/lib64/go/src/github.com/google/syzkaller/cover (from $GOROOT)
($GOPATH not set)
and so on. I always had to:
$ mkdir -p go/src/github <https://goto.google.com/src/github>.com/google/
$ ln -s "$PWD" go/src/github <https://goto.google.com/src/github>.com/google/syzkaller
export GOPATH="$PWD/go:/usr/share/go/contrib/"
export GOBIN="$PWD/bin"
Hi,
Exporting GOPATH is required to build any large Go programs. I am not sure
about GOBIN, I don't think it is necessary today.
But it does not help to finish building:
$ make
...
unsupported syscall: shmctl
unsupported syscall: shmdt
unsupported syscall: shmget
unsupported syscall: sync_file_range
make[1]: Leaving directory '/home/latest/repos/syzkaller'
go install ./syz-manager ./syz-fuzzer
go install golang.org/x/net/context: open /usr/share/go/contrib/pkg/linux_amd64/golang.org/x/net/context.a: permission denied
go install golang.org/x/oauth2/jws: open /usr/share/go/contrib/pkg/linux_amd64/golang.org/x/oauth2/jws.a: permission denied
go install google.golang.org/api/googleapi/internal/uritemplates: open /usr/share/go/contrib/pkg/linux_amd64/google.golang.org/api/googleapi/internal/uritemplates.a: permission denied
# golang.org/x/sys/unix
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall.go:74 <http://golang.org/x/sys/unix/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall.go:74>: missing function body for "use"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_linux_amd64.go:65: missing function body for "gettimeofday"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_unix.go:52: missing function body for "Syscall"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_unix.go:53: missing function body for "Syscall6"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_unix.go:54: missing function body for "RawSyscall"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_unix.go:55: missing function body for "RawSyscall6"
make: *** [Makefile:13: all] Error 2
Why does it want to install before building, actually?
Anyway, if I try to make manager after make generate, it still fails:
$ make manager
go build -o ./bin/syz-manager github.com/google/syzkaller/syz-manager
# golang.org/x/sys/unix
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall.go:74 <http://golang.org/x/sys/unix/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall.go:74>: missing function body for "use"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_linux_amd64.go:65: missing function body for "gettimeofday"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_unix.go:52: missing function body for "Syscall"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_unix.go:53: missing function body for "Syscall6"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_unix.go:54: missing function body for "RawSyscall"
/usr/share/go/contrib/src/golang.org/x/sys/unix/syscall_unix.go:55: missing function body for "RawSyscall6"
# github.com/google/syzkaller/gcego/src/github <https://goto.google.com/src/github>.com/google/syzkaller/gce/gce.go:129: unknown compute.Scheduling field 'Preemptible' in struct literal
make: *** [Makefile:25: manager] Error 2
FWIW x-sys is from a somewhat old package: golang-org-x-sys-source-0.0.0+
git20150612.b4e2899-1.10.x86_64 There is no newer in the distribution.
So I cannot persuaded it to build :(.
There seems to be something wrong either with the distribution, or with
the way you combined custom Go toolchain and distribution-provided
packages. Frankly I never used distribution-provided version of packages. I
would suggest to:
1. Download latest Go from https://golang.org/dl/
2. Extract into, say, $HOME/go
3. Set GOROOT to $HOME/go
4. Set PATH to $HOME/go/bin
5. Set GOPATH to $HOME/gopath
6. go get -d github.com/google/syzkaller/...
7. cd $HOME/gopath/src/github.com/google/syzkaller
8. make
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jirislaby
commented on April 28, 2024
the way you combined custom Go toolchain and distribution-provided packages. Frankly I never used distribution-provided version of packages. I would suggest to:
The problem is that syzkaller is packaged in opensuse and what I wrote is what I do during packaging (and checked locally). But I cannot update syzkaller package due to errors above :(.
The steps work locally of course, but cannot be used for packaging...
But I suspect google api package to be too old. And it requires gprc etc. which I am unable to package due to errors...
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dvyukov
commented on April 28, 2024
Are there any known users of syzkaller package? Does it worth packaging at all provided that a user can get the latest version with a single go get?...
To answer your questions, this error:
/usr/share/go/contrib/pkg/linux_amd64/golang.org/x/net/context.a: permission denied
go install golang.org/x/oauth2/jws: open
means that the package is prebuilt in the read-only location, but it was build using an old toolchain. Now you are trying to build syzkaller with a newer toolchain and so it tried to reinstall these old packages, but it fails because the location is read-only.
So if you building with a newer toolchain, you need to rebuild all dependencies with newer toolchain.
You may also need to update sources for some packages. I've seen the GCE api packages changed interfaces at some point. Not sure about golang.org/x/sys, but the first step would be to update it as well.
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dvyukov
commented on April 28, 2024
Maybe if you do go build of the syzkaller binaries, it will work. go build does not install anything, it just builds in a temp location. So it may help with the permission denied failures.
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dvyukov
commented on April 28, 2024
Jiri, I am closing this as I don't what we can do on our side. At this point syzkaller is meant to be used from HEAD.
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Related Issues (20)
- pkg/cover/backend: found unexpected tag PartialUnit on top level HOT 2
- prog: let encoding.go support `AUTO` for structs HOT 1
- pkg/compiler: facilitate unified const/flags definitions HOT 2
- pkg/build: incorrect use of t.Fatal()/t.Fatalf() in tests HOT 2
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- dashboard: Cc bug stakeholders in monthly reports
- syzkaller/syzbot: highlight bugs that can be triggered without privileges
- pkg/bisect: rollback the guilty commit and test HOT 6
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- go: Permission denied HOT 2
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