[#101179] Spectre Mitigations — Amel <amel.smajic@...>
Hi there!
5 messages
2020/12/01
[#101180] Re: Spectre Mitigations
— Chris Seaton <chris@...>
2020/12/01
I wouldn’t recommend using Ruby to run in-process untrusted code in the first place. Are people doing that?
[#101694] Ruby 3.0.0 Released — "NARUSE, Yui" <naruse@...>
We are pleased to announce the release of Ruby 3.0.0. From 2015 we
4 messages
2020/12/25
[ruby-core:101829] [Ruby master Bug#17493] Calling Reline::Unicode.calculate_width appears to lock up when called from emacs or if output is redirected
From:
rsharman@...
Date:
2020-12-31 06:30:07 UTC
List:
ruby-core #101829
Issue #17493 has been reported by rsharman (Richard Sharman).
----------------------------------------
Bug #17493: Calling Reline::Unicode.calculate_width appears to lock up when called from emacs or if output is redirected
https://bugs.ruby-lang.org/issues/17493
* Author: rsharman (Richard Sharman)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin17]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
In https://github.com/ruby/reline/pull/224 there is a test program
```
require "reline"
p Reline::Unicode.calculate_width("√")
```
as a test case for bug #17405. This program hangs when called from an emacs shell.
The problem is that cursor_pos in reline/ansi.rb outputs ESC [ 6 n and expects to be able read in raw mode the cursor position. This doesn't work when ruby is invoked from a shell inside emacs.
```
--> #1 /Users/richard/.rbenv/versions/3.0/lib/ruby/3.0.0/reline/ansi.rb:175:in `cursor_pos'
#2 /Users/richard/.rbenv/versions/3.0/lib/ruby/3.0.0/reline.rb:373:in `may_req_ambiguous_char_width'
#3 /Users/richard/.rbenv/versions/3.0/lib/ruby/3.0.0/reline.rb:359:in `ambiguous_width'
#4 /Users/richard/.rbenv/versions/3.0/lib/ruby/3.0.0/forwardable.rb:238:in `ambiguous_width'
#5 /Users/richard/.rbenv/versions/3.0/lib/ruby/3.0.0/reline/unicode.rb:115:in `get_mbchar_width'
#6 /Users/richard/.rbenv/versions/3.0/lib/ruby/3.0.0/reline/unicode.rb:143:in `calculate_width'
#7 /Users/richard/rubystuff/bugs/cursor_pos/test.rb:4
```
Even when run from an actual terminal, a similar problem occurs if stdout is redirected:
```
$ ruby test2.rb > T
```
The program appears to have locked up at this point; pressing Control-C will not terminate it.
Is it valid for a routine that calculates a character's width to assume that stdin is actually an ANSI sequence compatible terminal?
(This also occurs with ruby version 2.7.2p137.)
---Files--------------------------------
test.rb (75 Bytes)
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