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x/net/http2: WriteDataPadded shouldn't accepted padding characters #18809

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daurnimator opened this issue Jan 27, 2017 · 2 comments
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x/net/http2: WriteDataPadded shouldn't accepted padding characters #18809

daurnimator opened this issue Jan 27, 2017 · 2 comments
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Go1.9

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@daurnimator
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Carrying over from summerwind/h2spec#71 (comment)

In http2, padding MUST be null bytes. It makes no sense for WriteDataPadded to take padding bytes as an argument (it should only take the number of bytes)
@daurnimator daurnimator changed the title x/net/http2: WriteDataPadded should taking padding characters x/net/http2: WriteDataPadded shouldn't taking padding characters Jan 27, 2017
@bradfitz
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Note the API permits writing invalid stuff:

https://godoc.org/golang.org/x/net/http2#Framer

... has both AllowIllegalWrites and AllowIllegalReads.

This is useful for testing other implementations.

But I agree that there's something to do here. We should probably validate the pad on write unless AllowIllegalWrites is set.

@bradfitz bradfitz self-assigned this Jan 27, 2017
@odeke-em odeke-em changed the title x/net/http2: WriteDataPadded shouldn't taking padding characters x/net/http2: WriteDataPadded shouldn't accepted padding characters Jan 27, 2017
@bradfitz bradfitz added this to the Go1.9 milestone Feb 1, 2017
@gopherbot
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CL https://golang.org/cl/36118 mentions this issue.

@golang golang locked and limited conversation to collaborators Feb 1, 2018
c3mb0 pushed a commit to c3mb0/net that referenced this issue Apr 2, 2018
@bradfitz
http2: don't allow writing non-zero padding unless Framer.AllowIllega…
6ed8880 
…lWrites

Fixes golang/go#18809

Change-Id: Ib1014f3ebe5a57dde30b4eaf287a2cbff3c1179c
Reviewed-on: https://go-review.googlesource.com/36118
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Tom Bergan <tombergan@google.com>
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