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cmd/go: fuzz minimizing line gives a misleading number of bytes #48989

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katiehockman opened this issue Oct 14, 2021 · 1 comment
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cmd/go: fuzz minimizing line gives a misleading number of bytes #48989

katiehockman opened this issue Oct 14, 2021 · 1 comment
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FrozenDueToAge fuzz Issues related to native fuzzing support NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.18

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@katiehockman
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From #48884 @mvdan

func FuzzFoo(f *testing.F) {
	f.Fuzz(func(t *testing.T, n uint8) {
		if n%3 == 0 {
			t.Fatal("boom")
		}
	})
}

$ go test -fuzz=.
warning: starting with empty corpus
fuzz: elapsed: 0s, execs: 0 (0/sec), new interesting: 0 (total: 0)
fuzz: minimizing 26-byte crash input...
fuzz: elapsed: 0s, minimizing
--- FAIL: FuzzFoo (0.10s)
    fuzz_test.go:8: parent f.Logf

The fuzz: minimizing 26-byte crash input... line is wrong. It is minimizing a uint8, so there's no way that could be 26 bytes. Let's fix that, or just remove that line so it isn't misleading.

/cc @golang/fuzzing
@katiehockman katiehockman added NeedsFix The path to resolution is known, but the work has not been done. fuzz Issues related to native fuzzing support labels Oct 14, 2021
@katiehockman katiehockman added this to the Go1.18 milestone Oct 14, 2021
@katiehockman katiehockman mentioned this issue Oct 14, 2021
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@gopherbot
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Change https://golang.org/cl/361414 mentions this issue: internal/fuzz: improve minimizing message

@golang golang locked and limited conversation to collaborators Nov 4, 2022
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Labels
FrozenDueToAge fuzz Issues related to native fuzzing support NeedsFix The path to resolution is known, but the work has not been done.
Projects
Go Security
Status: No status
Milestone
Go1.18
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@gopherbot @katiehockman