From: "usa (Usaku NAKAMURA) via ruby-core" <ruby-core@...>
Date: 2023-06-19T11:28:03+00:00
Subject: [ruby-core:113939] [Ruby master Bug#19323] Integer overflow in `Integer#<<`

Issue #19323 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.7: REQUIRED, 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED to 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE, 3.2: REQUIRED

backported into `ruby_3_1` at 344249674f7a7835445a44695664897fa4b83f00

----------------------------------------
Bug #19323: Integer overflow in `Integer#<<`
https://bugs.ruby-lang.org/issues/19323#change-103592

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Backport: 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE, 3.2: REQUIRED
----------------------------------------
```ruby
require 'rbconfig/sizeof'
char_bit = RbConfig::LIMITS["UCHAR_MAX"].bit_length
size_max = RbConfig::LIMITS["SIZE_MAX"]
size_bit_max = size_max * char_bit
1 << size_bit_max
```

The above code raises an "integer overflow" error.

```
-:5:in `<<': integer overflow: 4611686018427387905 * 4 > 18446744073709551615 (ArgumentError)
	from -:5:in `<main>'
```

It doesn't seem like a proper or intentional exception.



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