October 2023 - ruby-dev - ml.ruby-lang.org

[ruby-dev:52056] [Ruby master Bug#19537] Regexp caching algorithm since v3.2.0 causes invalid memory access
by jeremyevans0 (Jeremy Evans) 26 Oct '23

26 Oct '23

Issue #19537 has been updated by jeremyevans0 (Jeremy Evans). Status changed from Open to Closed Fixed in commit:a1c2c274eebcc2a5275b677ebf94a8dbff380770 ---------------------------------------- Bug #19537: Regexp caching algorithm since v3.2.0 causes invalid memory access https://bugs.ruby-lang.org/issues/19537#change-105083 * Author: jj1uzh (Futa Miyachi) * Status: Closed * Priority: Normal * Assignee: make_now_just (Hiroya Fujinami) * ruby -v: ruby 3.3.0dev (2023-03-17T09:50:55Z master c65d7b4bea) [x86_64-linux] * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- Some types of regular expressions causes invalid memory access on `#match`. Length of strings to match does not matter. For example, for regex `/^([ab]{1,3})(a?)*$/`, `"aac"` can crash ruby. This bug may be caused in caching algorithm since v3.2.0. v3.1.3 is safe as far as I checked. Environments: Linux 6.2.6-arch1-1 x86-64, 16GB RAM Reproduce Process: ``` $> ruby -e 'p /^([ab]{1,3})(a?)*$/.match "aac"' -e:1: [BUG] Segmentation fault at 0x0000560315993d90 ruby 3.3.0dev (2023-03-17T09:50:55Z master c65d7b4bea) [x86_64-linux] ... ``` Whole output is attached as output.txt. Note that result may be `nil` correctly sometimes. Part of backtrace: ``` #5 0x000055ff30b71ecb in sigsegv (sig=11, info=0x55ff31bd0e70, ctx=0x55ff31bd0d40) at ../signal.c:964 #6 <signal handler called> #7 reset_match_cache (num_cache_table=<optimized out>, num_cache_size=3, table=0x55ff31e2d930, match_cache=0x55ff31e2aec0 "\300\f", pos=2, pend=<optimized out>, pbegin=0x55ff31dc7202 ">\030", reg=0x55ff31e199b0) at ../regexec.c:1292 #8 match_at (reg=reg@entry=0x55ff31e199b0, str=str@entry=0x7fb176c7f148 "aac", end=<optimized out>, end@entry=0x7fb176c7f14b "", sstart=sstart@entry=0x7fb176c7f148 "aac", sprev=<optimized out>, msa=msa@entry=0x7ffe40153d30) at ../regexec.c:3486 ``` ---Files-------------------------------- output.txt (17.4 KB) ruby-19537.patch (1.77 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52055] There is an overdue payment under your name. Please, settle your debts ASAP.
by ruby-dev＠ruby-lang.org 16 Oct '23

16 Oct '23

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[ruby-dev:52054] [Ruby master Feature#18573] Object#pack1
by mame (Yusuke Endoh) 13 Oct '23

13 Oct '23

Issue #18573 has been updated by mame (Yusuke Endoh). If we introduce a new method for this, I think it would be better to design a more descriptive API instead of reusing a hacky pack format directive, such as `0x1234.to_binary_string(4, endian: :big) #=> "\x00\x00\x12\x34"`. ---------------------------------------- Feature #18573: Object#pack1 https://bugs.ruby-lang.org/issues/18573#change-104913 * Author: os (Shigeki OHARA) * Status: Open * Priority: Normal ---------------------------------------- # 概要 String#unpack1 の逆の Object#pack1 が欲しい。 # 背景 Array#pack というメソッドがありますが、レシーバーの Array の要素数が 1 つしかないことが良くあります。 ``` ruby [codepoint].pack('U') [digest].pack('m0') [mail_body].pack('M') [ip_address].pack('N') ``` 標準添付ライブラリーなどを眺めてみてもチラホラあるようです。ですが、このようなケースで変換対象のオブジェクトをわざわざ Array でくるまなくてはいけないというのは面倒な気もします。 # 提案 String#unpack に対して String#unpack1 というメソッドがありますが、 Array#pack に対する Object#pack1 というメソッドを提案します。イメージとしては以下のコードのような感じです。 ``` ruby class Object def pack1(template, option = {}) [self].pack(template, **option) end end ``` # 議論・課題 * Object で良いかどうかは議論の余地があろうかと思います * メソッド名が pack1 で良いかはわかりませんが、他とかぶる可能性は低いかと思います -- https://bugs.ruby-lang.org/

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[ruby-dev:52053] [Ruby master Feature#18573] Object#pack1
by tenderlovemaking (Aaron Patterson) 12 Oct '23

12 Oct '23

Issue #18573 has been updated by tenderlovemaking (Aaron Patterson). matz (Yukihiro Matsumoto) wrote in #note-7: > Array.pack1 is unlikely because there is no connection between the responsibilities of the method and the Array class. I also disagree with String.pack1 for the same reason. > The most natural candidate is Object#pack1, but I question the need to pollute the namespace for this trivial method. > > Matz. Feature #18897 introduced a specialized instruction for Array#hash, but it created a new instruction called `opt_newarray_send`. I think we could leverage that instruction for the case of an array literal + pack. That would avoid the array creation. I will try to make a patch. ---------------------------------------- Feature #18573: Object#pack1 https://bugs.ruby-lang.org/issues/18573#change-104894 * Author: os (Shigeki OHARA) * Status: Open * Priority: Normal ---------------------------------------- # 概要 String#unpack1 の逆の Object#pack1 が欲しい。 # 背景 Array#pack というメソッドがありますが、レシーバーの Array の要素数が 1 つしかないことが良くあります。 ``` ruby [codepoint].pack('U') [digest].pack('m0') [mail_body].pack('M') [ip_address].pack('N') ``` 標準添付ライブラリーなどを眺めてみてもチラホラあるようです。ですが、このようなケースで変換対象のオブジェクトをわざわざ Array でくるまなくてはいけないというのは面倒な気もします。 # 提案 String#unpack に対して String#unpack1 というメソッドがありますが、 Array#pack に対する Object#pack1 というメソッドを提案します。イメージとしては以下のコードのような感じです。 ``` ruby class Object def pack1(template, option = {}) [self].pack(template, **option) end end ``` # 議論・課題 * Object で良いかどうかは議論の余地があろうかと思います * メソッド名が pack1 で良いかはわかりませんが、他とかぶる可能性は低いかと思います -- https://bugs.ruby-lang.org/

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[ruby-dev:52052] [Ruby master Feature#18573] Object#pack1
by matz (Yukihiro Matsumoto) 12 Oct '23

12 Oct '23

Issue #18573 has been updated by matz (Yukihiro Matsumoto). Array.pack1 is unlikely because there is no connection between the responsibilities of the method and the Array class. I also disagree with String.pack1 for the same reason. The most natural candidate is Object#pack1, but I question the need to pollute the namespace for this trivial method. Matz. ---------------------------------------- Feature #18573: Object#pack1 https://bugs.ruby-lang.org/issues/18573#change-104876 * Author: os (Shigeki OHARA) * Status: Open * Priority: Normal ---------------------------------------- # 概要 String#unpack1 の逆の Object#pack1 が欲しい。 # 背景 Array#pack というメソッドがありますが、レシーバーの Array の要素数が 1 つしかないことが良くあります。 ``` ruby [codepoint].pack('U') [digest].pack('m0') [mail_body].pack('M') [ip_address].pack('N') ``` 標準添付ライブラリーなどを眺めてみてもチラホラあるようです。ですが、このようなケースで変換対象のオブジェクトをわざわざ Array でくるまなくてはいけないというのは面倒な気もします。 # 提案 String#unpack に対して String#unpack1 というメソッドがありますが、 Array#pack に対する Object#pack1 というメソッドを提案します。イメージとしては以下のコードのような感じです。 ``` ruby class Object def pack1(template, option = {}) [self].pack(template, **option) end end ``` # 議論・課題 * Object で良いかどうかは議論の余地があろうかと思います * メソッド名が pack1 で良いかはわかりませんが、他とかぶる可能性は低いかと思います -- https://bugs.ruby-lang.org/

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[ruby-dev:52051] [Ruby master Feature#18573] Object#pack1
by Eregon (Benoit Daloze) 06 Oct '23

06 Oct '23

Issue #18573 has been updated by Eregon (Benoit Daloze). `Array.pack1(obj, format) -> String` sounds weird since there is nothing about Array in there. I think `String.pack1(format, obj)` is the best option. (`String#pack1(obj)` is confusing because of existing `Array#pack(format)` which has the reverse order). (IMO this is something a JIT should optimize but I understand that's hard on CRuby). ---------------------------------------- Feature #18573: Object#pack1 https://bugs.ruby-lang.org/issues/18573#change-104830 * Author: os (Shigeki OHARA) * Status: Open * Priority: Normal ---------------------------------------- # 概要 String#unpack1 の逆の Object#pack1 が欲しい。 # 背景 Array#pack というメソッドがありますが、レシーバーの Array の要素数が 1 つしかないことが良くあります。 ``` ruby [codepoint].pack('U') [digest].pack('m0') [mail_body].pack('M') [ip_address].pack('N') ``` 標準添付ライブラリーなどを眺めてみてもチラホラあるようです。ですが、このようなケースで変換対象のオブジェクトをわざわざ Array でくるまなくてはいけないというのは面倒な気もします。 # 提案 String#unpack に対して String#unpack1 というメソッドがありますが、 Array#pack に対する Object#pack1 というメソッドを提案します。イメージとしては以下のコードのような感じです。 ``` ruby class Object def pack1(template, option = {}) [self].pack(template, **option) end end ``` # 議論・課題 * Object で良いかどうかは議論の余地があろうかと思います * メソッド名が pack1 で良いかはわかりませんが、他とかぶる可能性は低いかと思います -- https://bugs.ruby-lang.org/

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[ruby-dev:52050] [Ruby master Feature#18573] Object#pack1
by jeremyevans0 (Jeremy Evans) 05 Oct '23

05 Oct '23

Issue #18573 has been updated by jeremyevans0 (Jeremy Evans). I developed a patch for this that implemented the feature using `Array.pack1` and was going to create a new feature request for it, but I'm glad to see there already is an existing feature request for it. Here's my pull request for it: https://github.com/ruby/ruby/pull/8598 ---------------------------------------- Feature #18573: Object#pack1 https://bugs.ruby-lang.org/issues/18573#change-104824 * Author: os (Shigeki OHARA) * Status: Open * Priority: Normal ---------------------------------------- # 概要 String#unpack1 の逆の Object#pack1 が欲しい。 # 背景 Array#pack というメソッドがありますが、レシーバーの Array の要素数が 1 つしかないことが良くあります。 ``` ruby [codepoint].pack('U') [digest].pack('m0') [mail_body].pack('M') [ip_address].pack('N') ``` 標準添付ライブラリーなどを眺めてみてもチラホラあるようです。ですが、このようなケースで変換対象のオブジェクトをわざわざ Array でくるまなくてはいけないというのは面倒な気もします。 # 提案 String#unpack に対して String#unpack1 というメソッドがありますが、 Array#pack に対する Object#pack1 というメソッドを提案します。イメージとしては以下のコードのような感じです。 ``` ruby class Object def pack1(template, option = {}) [self].pack(template, **option) end end ``` # 議論・課題 * Object で良いかどうかは議論の余地があろうかと思います * メソッド名が pack1 で良いかはわかりませんが、他とかぶる可能性は低いかと思います -- https://bugs.ruby-lang.org/

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