3058d38632
The Builder's ReadFrom method allows the underlying unsafe slice to escape, and for callers to subsequently modify memory that had been unsafely converted into an immutable string. In the original proposal for Builder (#18990), I'd noted there should be no Read methods: > There would be no Reset or Bytes or Truncate or Read methods. > Nothing that could mutate the []byte once it was unsafely converted > to a string. And in my prototype (https://golang.org/cl/37767), I handled ReadFrom properly, but when https://golang.org/cl/74931 arrived, I missed that it had a ReadFrom method and approved it. Because we're so close to the Go 1.10 release, just remove the ReadFrom method rather than think about possible fixes. It has marginal utility in a Builder anyway. Also, fix a separate bug that also allowed mutation of a slice's backing array after it had been converted into a slice by disallowing copies of the Builder by value. Updates #18990 Fixes #23083 Fixes #23084 Change-Id: Id1f860f8a4f5f88b32213cf85108ebc609acb95f Reviewed-on: https://go-review.googlesource.com/83255 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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