[release-branch.go1.17] crypto/rand: properly handle large Read on windows
Use the batched reader to chunk large Read calls on windows to a max of
1 << 31 - 1 bytes. This prevents an infinite loop when trying to read
more than 1 << 32 -1 bytes, due to how RtlGenRandom works.
This change moves the batched function from rand_unix.go to rand.go,
since it is now needed for both windows and unix implementations.
Updates #52561
Fixes #52932
Fixes CVE-2022-30634
Change-Id: Id98fc4b1427e5cb2132762a445b2aed646a37473
Reviewed-on: https://go-review.googlesource.com/c/go/+/402257
Run-TryBot: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Filippo Valsorda <valsorda@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
(cherry picked from commit
bb1f4416180511231de6d17a1f2f55c82aafc863)
Reviewed-on: https://go-review.googlesource.com/c/go/+/406635
Reviewed-by: Damien Neil <dneil@google.com>