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Update other fuzz docs for consistency

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Alisdair McDiarmid 2020-05-14 14:42:50 -04:00
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43
hclsyntax/fuzz/README.md
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@ -3,24 +3,49 @@
This directory contains helper functions and corpuses that can be used to
fuzz-test the `hclsyntax` parsers using [go-fuzz](https://github.com/dvyukov/go-fuzz).
To fuzz, first install go-fuzz and its build tool in your `GOPATH`:
## Work directory
`go-fuzz` needs a working directory where it can keep state as it works. This
should ideally be in a ramdisk for efficiency, and should probably _not_ be on
an SSD to avoid thrashing it. Here's how to create a ramdisk:
### macOS
```
$ make tools
$ SIZE_IN_MB=1024
$ DEVICE=`hdiutil attach -nobrowse -nomount ram://$(($SIZE_IN_MB*2048))`
$ diskutil erasevolume HFS+ RamDisk $DEVICE
$ export RAMDISK=/Volumes/RamDisk
```
### Linux
```
$ mkdir /mnt/ramdisk
$ mount -t tmpfs -o size=1024M tmpfs /mnt/ramdisk
$ export RAMDISK=/mnt/ramdisk
```
## Running the fuzzer
Next, install `go-fuzz` and its build tool in your `GOPATH`:
```
$ make tools FUZZ_WORK_DIR=$RAMDISK
```
Now you can fuzz one or all of the parsers:
```
$ make fuzz-config FUZZ_WORK_DIR=/tmp/hcl2-fuzz-config
$ make fuzz-expr FUZZ_WORK_DIR=/tmp/hcl2-fuzz-expr
$ make fuzz-template FUZZ_WORK_DIR=/tmp/hcl2-fuzz-template
$ make fuzz-traversal FUZZ_WORK_DIR=/tmp/hcl2-fuzz-traversal
$ make fuzz-config FUZZ_WORK_DIR=$RAMDISK/hclsyntax-fuzz-config
$ make fuzz-expr FUZZ_WORK_DIR=$RAMDISK/hclsyntax-fuzz-expr
$ make fuzz-template FUZZ_WORK_DIR=$RAMDISK/hclsyntax-fuzz-template
$ make fuzz-traversal FUZZ_WORK_DIR=$RAMDISK/hclsyntax-fuzz-traversal
```
In all cases, set `FUZZ_WORK_DIR` to a directory where `go-fuzz` can keep state
as it works. This should ideally be in a ramdisk for efficiency, and should
probably _not_ be on an SSD to avoid thrashing it.
~> Note: `go-fuzz` does not interact well with `goenv`. If you encounter build
errors where the package `go.fuzz.main` could not be found, you may need to use
a machine with a direct installation of Go.
## Understanding the result

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json/fuzz/README.md
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This directory contains helper functions and corpuses that can be used to
fuzz-test the HCL JSON parser using [go-fuzz](https://github.com/dvyukov/go-fuzz).
To fuzz, first install go-fuzz and its build tool in your `GOPATH`:
## Work directory
`go-fuzz` needs a working directory where it can keep state as it works. This
should ideally be in a ramdisk for efficiency, and should probably _not_ be on
an SSD to avoid thrashing it. Here's how to create a ramdisk:
### macOS
```
$ make tools
$ SIZE_IN_MB=1024
$ DEVICE=`hdiutil attach -nobrowse -nomount ram://$(($SIZE_IN_MB*2048))`
$ diskutil erasevolume HFS+ RamDisk $DEVICE
$ export RAMDISK=/Volumes/RamDisk
```
Now you can fuzz one or all of the parsers:
### Linux
```
$ make fuzz-config FUZZ_WORK_DIR=/tmp/hcl2-fuzz-config
$ mkdir /mnt/ramdisk
$ mount -t tmpfs -o size=1024M tmpfs /mnt/ramdisk
$ export RAMDISK=/mnt/ramdisk
```
In all cases, set `FUZZ_WORK_DIR` to a directory where `go-fuzz` can keep state
as it works. This should ideally be in a ramdisk for efficiency, and should
probably _not_ be on an SSD to avoid thrashing it.
## Running the fuzzer
Next, install `go-fuzz` and its build tool in your `GOPATH`:
```
$ make tools FUZZ_WORK_DIR=$RAMDISK
```
Now you can fuzz the parser:
```
$ make fuzz-config FUZZ_WORK_DIR=$RAMDISK/json-fuzz-config
```
~> Note: `go-fuzz` does not interact well with `goenv`. If you encounter build
errors where the package `go.fuzz.main` could not be found, you may need to use
a machine with a direct installation of Go.
## Understanding the result