go-fuzz-build fails with Go 1.15 due to uncertain position of comments #294

oraluben · 2020-08-05T02:25:20Z

failed case 1:

# yyc @ Yichens-MacBook-Pro in ~/GolandProjects/fuzz-test/fuzz on git:go-ast-bug-demo x [9:58:01] C:1
$ go-fuzz-build
failed to execute go build: exit status 2
# fuzz-test/fuzz
/Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:3: misplaced compiler directive

# yyc @ Yichens-MacBook-Pro in ~/GolandProjects/fuzz-test/fuzz on git:go-ast-bug-demo x [10:07:06] C:1
$ cat fuzzer.go      
package fuzz

//go:noescape
func foo() {}

func Fuzz(input []byte) int {
        foo()
        return 0
}

go-fuzz-build will transform the input file to the following, which is obviously incorrect:

//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:1
package fuzz

//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:1
import

//go:noescape
//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:1
_go_fuzz_dep_ "go-fuzz-dep"

//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:4
func foo()	{ _go_fuzz_dep_.CoverTab[22588]++ }

func Fuzz(input []byte) int {
//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:6
	_go_fuzz_dep_.CoverTab[44810]++
								foo()
								return 0
}

//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:9
var _ = _go_fuzz_dep_.CoverTab

I found this probably a go bug and submitted an issue: golang/go#40546
I've also fixed this import issue with an ugly patch: https://github.com/oraluben/go-fuzz/tree/fix-import, but that does not overcome this issue, see case 2:

failed case 2

# yyc @ Yichens-MacBook-Pro in ~/GolandProjects/fuzz-test/fuzz on git:go-ast-bug-demo x [10:17:46] C:130
$ go-fuzz-build                             
failed to execute go build: exit status 2
# reflect
/Users/yyc/go/go1.15beta1/src/reflect/value.go:1425: misplaced compiler directive

# yyc @ Yichens-MacBook-Pro in ~/GolandProjects/fuzz-test/fuzz on git:go-ast-bug-demo x [10:17:57] C:1
$ cat fuzzer.go                                                               
package fuzz

import "reflect"

func Fuzz(input []byte) int {
        reflect.DeepEqual(1, 1)
        return 0
}

the source: https://github.com/golang/go/blob/master/src/reflect/value.go#L1421-L1451
the transformed code:

//line /Users/yyc/go/go1.15beta1/src/reflect/value.go:1420
				return __gofuzz_v1 !=

//line /Users/yyc/go/go1.15beta1/src/reflect/value.go:1425
				//go:nocheckptr
//line /Users/yyc/go/go1.15beta1/src/reflect/value.go:1420
				__gofuzz_v2
//line /Users/yyc/go/go1.15beta1/src/reflect/value.go:1420
			}() == true
//line /Users/yyc/go/go1.15beta1/src/reflect/value.go:1420
		default:
//line /Users/yyc/go/go1.15beta1/src/reflect/value.go:1420
			_go_fuzz_dep_.CoverTab[7638]++
		}
//line /Users/yyc/go/go1.15beta1/src/reflect/value.go:1421
	}
//line /Users/yyc/go/go1.15beta1/src/reflect/value.go:1421
	_go_fuzz_dep_.CoverTab[54290]++
								panic(&ValueError{"reflect.Value.OverflowUint", v.kind()})
}

you can find //go:nocheckptr was inserted in the middle.
I found it not easy to fix this without fixing the printer's logic, maybe you would have more idea about how to workaround this in go-fuzz-build?

The text was updated successfully, but these errors were encountered:

oraluben · 2020-08-12T02:33:09Z

update 1:
this case didn't fail, which confuse me very much:
case 1a (note it's not a compiler directive, but a regular comment, there's a space there):

$ cat fuzzer.go      
package fuzz

// go:noescape
func foo() {}

func Fuzz(input []byte) int {
        foo()
        return 0
}

go-fuzz-build generates:

//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:1
package fuzz

//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:1
import _go_fuzz_dep_ "go-fuzz-dep"

// go:noescape
func test()	{ _go_fuzz_dep_.CoverTab[22588]++ }

func Fuzz(input []byte) int {
//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:6
	_go_fuzz_dep_.CoverTab[44810]++
								test()
								return 0
}

//line /Users/yyc/GolandProjects/fuzz-test/fuzz/fuzzer.go:9
var _ = _go_fuzz_dep_.CoverTab

update 1.1
normal comments who aren't doc of a function will be removed by trimComments, that's why this case didn't fail.

tdewolff · 2020-08-18T21:26:32Z

Same issue, this happens with Go 1.15 and throws a warning for the following files:

/usr/lib/go/src/vendor/golang.org/x/crypto/poly1305/sum_amd64.go:9: misplaced compiler directive
/usr/lib/go/src/crypto/sha256/sha256block_decl.go:9: misplaced compiler directive
/usr/lib/go/src/reflect/value.go:1432: misplaced compiler directive

degeri · 2020-08-19T06:50:30Z

can confirm getting similar issues on 1.15

failed to execute go build: exit status 2
# crypto/sha256
/usr/local/go/src/crypto/sha256/sha256block_decl.go:9: misplaced compiler directive


failed to execute go build: exit status 2
# reflect
/usr/local/go/src/reflect/value.go:1432: misplaced compiler directive

oraluben · 2020-08-19T08:14:09Z

I believe #265 has the same root cause.

oraluben · 2020-08-19T08:56:15Z

Assigning a position for all inserted statements/functions should be a useful workaround, I will try this on go-fuzz. POC: https://play.golang.org/p/KNEE2J4FrWt.

dgryski · 2020-08-19T16:12:48Z

@dvyukov Can you pin this issue so people see it first?

dvyukov · 2020-08-19T16:19:51Z

done

karimodm · 2020-09-22T12:59:53Z

Can confirm this as well; it recently popped up with a new Fuzz function & go 1.15

c4milo · 2020-10-06T15:24:11Z

I'm also running into this

smijolovic · 2020-10-12T18:58:02Z

Same issue here as well with 1.15.2. Runs just fine on 1.14.9.

Tested with prometheus -
go-fuzz-build -libfuzzer -x -func ${FUZZ_FUNCTIONS[i]} -o ${TARGETS[i]}.a ./promql
clang-9 -fsanitize=fuzzer ${TARGETS[i]}.a -o ${TARGETS[i]}

GO111MODULE=off
TARGETS=("promql-parse-metric" "promql-parse-open-metric" "promql-parse-metric-selector" "promql-parse-expr")
FUZZ_FUNCTIONS=("FuzzParseMetric" "FuzzParseOpenMetric" "FuzzParseMetricSelector" "FuzzParseExpr")
(( i=0 ))
(( i<4 ))
pwd
export GOPATH=/home/rpmbuild/nimbus8/prometheus-build/prometheus-chaasm-2.21.0/src/github.com/prometheus/prometheus/../../../..:/usr/share/gocode
GOPATH=/home/rpmbuild/nimbus8/prometheus-build/prometheus-chaasm-2.21.0/src/github.com/prometheus/prometheus/../../../..:/usr/share/gocode
go-fuzz-build -libfuzzer -x -func FuzzParseMetric -o promql-parse-metric.a ./promql
clang-9 -fsanitize=fuzzer promql-parse-metric.a -o promql-parse-metric
(( ++i ))
(( i<4 ))
pwd
export GOPATH=/home/rpmbuild/nimbus8/prometheus-build/prometheus-chaasm-2.21.0/src/github.com/prometheus/prometheus/../../../..:/usr/share/gocode
GOPATH=/home/rpmbuild/nimbus8/prometheus-build/prometheus-chaasm-2.21.0/src/github.com/prometheus/prometheus/../../../..:/usr/share/gocode
go-fuzz-build -libfuzzer -x -func FuzzParseOpenMetric -o promql-parse-open-metric.a ./promql
clang-9 -fsanitize=fuzzer promql-parse-open-metric.a -o promql-parse-open-metric
(( ++i ))
(( i<4 ))
pwd
export GOPATH=/home/rpmbuild/nimbus8/prometheus-build/prometheus-chaasm-2.21.0/src/github.com/prometheus/prometheus/../../../..:/usr/share/gocode
GOPATH=/home/rpmbuild/nimbus8/prometheus-build/prometheus-chaasm-2.21.0/src/github.com/prometheus/prometheus/../../../..:/usr/share/gocode
go-fuzz-build -libfuzzer -x -func FuzzParseMetricSelector -o promql-parse-metric-selector.a ./promql
clang-9 -fsanitize=fuzzer promql-parse-metric-selector.a -o promql-parse-metric-selector
(( ++i ))
(( i<4 ))
pwd
export GOPATH=/home/rpmbuild/nimbus8/prometheus-build/prometheus-chaasm-2.21.0/src/github.com/prometheus/prometheus/../../../..:/usr/share/gocode
GOPATH=/home/rpmbuild/nimbus8/prometheus-build/prometheus-chaasm-2.21.0/src/github.com/prometheus/prometheus/../../../..:/usr/share/gocode
go-fuzz-build -libfuzzer -x -func FuzzParseExpr -o promql-parse-expr.a ./promql
clang-9 -fsanitize=fuzzer promql-parse-expr.a -o promql-parse-expr
(( ++i ))
(( i<4 ))

With 1.15.2 - failed to execute go build: exit status 2

cd /home/rpmbuild/nimbus8/prometheus-build/tmp/go-fuzz-build886823602/goroot/src/vendor/golang.org/x/crypto/poly1305
/home/rpmbuild/nimbus8/prometheus-build/tmp/go-fuzz-build886823602/goroot/pkg/tool/linux_amd64/compile -o $WORK/b103/pkg.a -trimpath "$WORK/b103=>;/home/rpmbuild/nimbus8/prometheus-build/tmp/go-fuzz-build886823602/goroot/src/vendor/golang.org/x/crypto/poly1305=>vendor/golang.org/x/crypto/poly1305" -shared -p vendor/golang.org/x/crypto/poly1305 -std -installsuffix shared -buildid 33iG-gyaedDveO6r-jm3/33iG-gyaedDveO6r-jm3 -goversion go1.15.2 -symabis $WORK/b103/symabis -D "" -importcfg $WORK/b103/importcfg -pack -asmhdr $WORK/b103/go_asm.h ./bits_go1.13.go ./poly1305.go ./sum_amd64.go ./sum_generic.go

vendor/golang.org/x/crypto/poly1305
/usr/local/go15/src/vendor/golang.org/x/crypto/poly1305/sum_amd64.go:9: misplaced compiler directive
crypto/sha256
/usr/local/go15/src/crypto/sha256/sha256block_decl.go:9: misplaced compiler directive"

holykol · 2020-10-25T19:59:21Z

My quick fix until the issue is resolved:

sudo sed -i "s/go:nocheckptr/ go:nocheckptr/" /usr/lib/go/src/reflect/value.go

Dentrax · 2020-10-26T07:03:39Z

@dvyukov

Any updates about this? Getting a similar error output:

failed to execute go build: exit status 2
# reflect
/usr/local/Cellar/go/1.15.2/libexec/src/reflect/value.go:1432: misplaced compiler directive

dvyukov · 2020-10-26T07:04:40Z

No updates.

Use syz-old-env because it contains Go 1.14. syz-env contains Go 1.15 and go-fuzz is broken with Go 1.15: dvyukov/go-fuzz#294

dolmen · 2020-11-13T20:03:34Z

Could you put "misplaced compiler directive" in the title of this issue? I think that's how people will find it.

josharian · 2020-11-14T22:08:40Z

Will you try #307 out? Thanks.

gsora · 2020-11-14T22:33:08Z

Nope, doesn't work, same error is still there.

josharian · 2020-11-15T00:38:00Z

I’m confused, then. After that PR I can’t reproduce. When you say “the same error”, are you talking about crypto/sha256?

gsora · 2020-11-15T12:01:10Z

Yes, I'm talking about the crypto/sha256 error.

josharian · 2020-11-15T15:18:22Z

@degeri can you also still reproduce using that PR?

degeri · 2020-11-15T16:20:57Z

Hi @josharian . First of all thanks for all the work.

I am using 307 and still getting

failed to execute go build: exit status 2
# crypto/sha256
/usr/local/go/src/crypto/sha256/sha256block_decl.go:9: misplaced compiler directive

failed to execute go build: exit status 2
# crypto/sha256
/usr/local/go/src/crypto/sha256/sha256block_decl.go:9: misplaced compiler directive

https://github.com/degeri/dcrd-continuous-fuzz#there-is-also-a-dockerless-version if my repo if you want to have a look.

josharian · 2020-11-15T17:39:42Z

I tried, and I can't reproduce using your dockerless shell script and Go 1.15.5. Can you re-install go-fuzz-build from that PR branch and try again? I am really at a loss as to what the difference could be.

degeri · 2020-11-15T18:13:18Z

Yup I am quiet sure since I deleted my bins and built on your PR.

josharian · 2020-11-15T19:26:20Z

Can you add a line after

go-fuzz/go-fuzz-build/main.go

Line 727 in d9fd818

c.writeFile(tmp, buf.Bytes())

that also prints buf.Bytes to stdout and re-run and provide the instrumented file contents of sha256block_decl.go? Thanks.

danp · 2020-11-15T19:59:48Z

Was seeing if I could reproduce the error @degeri was still running into. At first I thought I was but then I noticed the second commit on #307 isn't actually on the branch so I had to work a bit harder to get it (with git cherry-pick). Once I did that, the test case I had using crypto/sha256 started working. Here's the output for sha256block_decl.go:

// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build 386 amd64 s390x ppc64le

//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:7
package sha256

//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:7
import (
//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:7
	_go_fuzz_dep_ "go-fuzz-dep"
//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:7
)

//go:noescape

func block(dig *digest, p []byte)

//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:11
var _ = _go_fuzz_dep_.CoverTab

// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build 386 amd64 s390x ppc64le

//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:7
package sha256

//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:7
import (
//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:7
	_go_fuzz_dep_ "go-fuzz-dep"
//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:7
)

//go:noescape

func block(dig *digest, p []byte)

//line /Users/dan/Projects/go/project/go/src/crypto/sha256/sha256block_decl.go:11
var _ = _go_fuzz_dep_.CoverTab

I found it a bit tricky to ensure I was using the right version of go-fuzz-build due to modules. Ended up having to add a go.mod to my go-fuzz clone and had a go.mod looking like this in my test project:

module github.com/danp/fuzz

go 1.16

replace github.com/dvyukov/go-fuzz => ../../dvyukov/go-fuzz

require (
	github.com/dvyukov/go-fuzz v0.0.0-20201114070042-d9fd8180255a // indirect
	github.com/elazarl/go-bindata-assetfs v1.0.1 // indirect
	github.com/stephens2424/writerset v1.0.2 // indirect
	golang.org/x/tools v0.0.0-20201114224030-61ea331ec02b // indirect
)

josharian · 2020-11-15T20:15:47Z

Thanks, @danp. Based on that, I’ve merged the PR. Hopefully it’ll be easier to test now.

degeri · 2020-11-15T20:17:27Z

@joeshaw should I test on master now ?

josharian · 2020-11-15T20:18:53Z

Yes please

degeri · 2020-11-15T20:31:46Z

works now 🎉
Double checked on a fresh docker

dvyukov/go-fuzz#294 has been fixed hence we can update to 1.15.5

dolmen · 2020-11-16T08:06:23Z

Thank you @dvyukov for this project, and thank you everyone involved in this fix!

MartinPetkov · 2021-10-28T14:36:35Z

I'm still seeing this issue with Go 1.17. I did the following:

Create a fuzz.go in a project I'm working on, which uses github.com/OneOfOne/[email protected]

Run it in docker to ensure the version:

docker run -it -v $(pwd):/src:ro golang:1.17 /bin/bash

Install go-fuzz-build:

go get -u github.com/dvyukov/go-fuzz/go-fuzz@latest  \
       github.com/dvyukov/go-fuzz/go-fuzz-build@latest

Install go-fuzz-dep in the repo

cd /src
go get -u github.com/dvyukov/go-fuzz/go-fuzz-dep@latest

Try building it, which gives an error:

cd /src/internal/fuzz/target
go-fuzz-build

failed to execute go build: exit status 2
# github.com/OneOfOne/xxhash
/usr/local/google/home/mpetkov/go/pkg/mod/github.com/!one!of!one/[email protected]/xxhash_unsafe.go:106: misplaced compiler directive

If I'm reading this thread correctly, this should no longer be an issue with the newest version of go-fuzz-build. Is there something else I should do to get it to work?

MartinPetkov · 2021-10-28T14:59:27Z

For anyone finding this, I actually took a look into open-policy-agent/opa#3243 and it seems the following bypasses the error I see:

go-fuzz-build -preserve github.com/OneOfOne/xxhash

fuzzah · 2024-02-02T09:58:24Z

go 1.21.6, had a similar problem with crypto/internal/bigmod, fixed in the same way:

go-fuzz-build -preserve crypto/internal/bigmod

For anyone facing this: just make sure the module you're preserving (excluding from go-fuzz instrumentation) is not the module you want to fuzz :)

This fixes yet more manifestations of #294.

And re-instrument reflect. Sheesh. #294. Again.

josharian · 2024-02-02T23:42:08Z

Sent #353 which will fix more such issues.

For others finding this thread with their own new packages that don't build: Please provide a short standalone reproducer, not just a package path (or worse, just an error message with a line number). Thank you.

This fixes yet more manifestations of #294.

And re-instrument reflect. Sheesh. #294. Again.

tdewolff mentioned this issue Aug 18, 2020

cmd/compile: misplaced compiler directive for standard library golang/go#40852

Closed

dvyukov pinned this issue Aug 19, 2020

oraluben changed the title ~~go-fuzz-build failed due to function with comments~~ go-fuzz-build failed due to uncertain position of comments Aug 20, 2020

mohammed90 mentioned this issue Aug 20, 2020

ci: Tweaks for multi go version tests caddyserver/caddy#3673

Merged

oraluben added a commit to oraluben/go-fuzz that referenced this issue Aug 24, 2020

Fix dvyukov#294 for reflect/value.go

649feeb

oraluben mentioned this issue Aug 24, 2020

Fix position of comments #297

Closed

oraluben added a commit to oraluben/go-fuzz that referenced this issue Aug 27, 2020

Fix dvyukov#294 for reflect/value.go

a527988

thepudds mentioned this issue Sep 24, 2020

"go-fuzz-build" leads to "misplaced compiler directive" #301

Closed

degeri mentioned this issue Sep 26, 2020

updates degeri/dcrd-continuous-fuzz#8

Merged

ksurent mentioned this issue Oct 1, 2020

setup fuzzing bookingcom/nanotube#98

Merged

kostko mentioned this issue Oct 5, 2020

Fix fuzz-build oasisprotocol/oasis-core#3374

Closed

dvyukov changed the title ~~go-fuzz-build failed due to uncertain position of comments~~ go-fuzz-build fails with Go 1.15 due to uncertain position of comments Oct 27, 2020

dvyukov mentioned this issue Oct 27, 2020

.github/workflows: switch fuzzit to syz-old-env google/syzkaller#2221

Merged

dvyukov added a commit to dvyukov/syzkaller that referenced this issue Oct 27, 2020

.github/workflows: switch fuzzit to syz-old-env

c2ce527

Use syz-old-env because it contains Go 1.14. syz-env contains Go 1.15 and go-fuzz is broken with Go 1.15: dvyukov/go-fuzz#294

dvyukov added a commit to google/syzkaller that referenced this issue Oct 27, 2020

.github/workflows: switch fuzzit to syz-old-env

96e03c1

Use syz-old-env because it contains Go 1.14. syz-env contains Go 1.15 and go-fuzz is broken with Go 1.15: dvyukov/go-fuzz#294

josharian reopened this Nov 14, 2020

josharian closed this as completed in 0701ec3 Nov 15, 2020

degeri added a commit to degeri/dcrd-continuous-fuzz that referenced this issue Nov 15, 2020

Updated to latest golang

0dde6de

dvyukov/go-fuzz#294 has been fixed hence we can update to 1.15.5

degeri mentioned this issue Nov 15, 2020

Updated to latest golang degeri/dcrd-continuous-fuzz#9

Merged

AdamKorcz mentioned this issue Nov 19, 2020

Added fuzzer for frontend dockerfile parser moby/buildkit#1813

Open

josharian unpinned this issue Nov 20, 2020

tsandall mentioned this issue Mar 8, 2021

Fix nightly fuzzer build failures open-policy-agent/opa#3233

Closed

josharian added a commit that referenced this issue Feb 2, 2024

go-fuzz-build: add yet more positions

2bb6d9c

This fixes yet more manifestations of #294.

josharian added a commit that referenced this issue Feb 2, 2024

go-fuzz-build: add even more positions

097e1d4

And re-instrument reflect. Sheesh. #294. Again.

josharian added a commit that referenced this issue Feb 3, 2024

go-fuzz-build: add yet more positions

7356175

This fixes yet more manifestations of #294.

josharian added a commit that referenced this issue Feb 3, 2024

go-fuzz-build: add even more positions

b1ce7bc

And re-instrument reflect. Sheesh. #294. Again.

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go-fuzz-build fails with Go 1.15 due to uncertain position of comments #294

go-fuzz-build fails with Go 1.15 due to uncertain position of comments #294

oraluben commented Aug 5, 2020

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josharian commented Feb 2, 2024

go-fuzz-build fails with Go 1.15 due to uncertain position of comments #294

go-fuzz-build fails with Go 1.15 due to uncertain position of comments #294

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josharian commented Feb 2, 2024

oraluben commented Aug 12, 2020 •

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degeri commented Aug 19, 2020 •

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smijolovic commented Oct 12, 2020 •

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gsora commented Nov 14, 2020 •

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