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sparklemotion / nokogiri

Nokogiri (鋸) makes it easy and painless to work with XML and HTML from Ruby.
https://nokogiri.org/
MIT License
6.15k stars 897 forks source link

Segfault when assigning DocumentFragment.children to Document.root #1900

Closed whirsch-pubfactory closed 3 years ago

whirsch-pubfactory commented 5 years ago

Describe the bug

I was playing around with nokogiri, and managed to segfault it by assigning DocumentFragment.children to Document.root, rather than DocumentFragment.children[0]

To Reproduce

require 'nokogiri'

a = Nokogiri::XML::Document.new
b = Nokogiri::XML::DocumentFragment.new a
a.root = b.children

Expected behavior

It should fail with an argument error like all other types passed into it do.

Environment

# Nokogiri (1.10.3)
    ---
    warnings: []
    nokogiri: 1.10.3
    ruby:
      version: 2.6.3
      platform: x86_64-linux
      description: ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
      engine: ruby
    libxml:
      binding: extension
      source: packaged
      libxml2_path: "/home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/ports/x86_64-pc-linux-gnu/libxml2/2.9.9"
      libxslt_path: "/home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/ports/x86_64-pc-linux-gnu/libxslt/1.1.33"
      libxml2_patches:
      - 0001-Revert-Do-not-URI-escape-in-server-side-includes.patch
      - 0002-Remove-script-macro-support.patch
      - 0003-Update-entities-to-remove-handling-of-ssi.patch
      libxslt_patches:
      - 0001-Fix-security-framework-bypass.patch
      compiled: 2.9.9
      loaded: 2.9.9

Additional context

segfault.rb:5: [BUG] Segmentation fault at 0x0000000000000019
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0003 p:---- s:0014 e:000013 CFUNC  :root=
c:0002 p:0054 s:0009 E:002480 EVAL   segfault.rb:5 [FINISH]
c:0001 p:0000 s:0003 E:001550 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
segfault.rb:5:in `<main>'
segfault.rb:5:in `root='

-- Machine register context ------------------------------------------------
 RIP: 0x00007fb0b7fd8a9f RBP: 0x00007ffd1e862890 RSP: 0x00007ffd1e862840
 RAX: 0x0000000000000001 RBX: 0x000055665d411e00 RCX: 0x0000000002a19626
 RDX: 0x000055665d4024c0 RDI: 0x000055665d4024c0 RSI: 0x00000000267ccb68
  R8: 0x00007fb0bb295e98  R9: 0x0000000000000010 R10: 0x0000000000000771
 R11: 0x00007fb0b7fd8eac R12: 0x000055665d3b5fc0 R13: 0x0000000000000000
 R14: 0x000055665d2a1a10 R15: 0x000055665d411f90 EFL: 0x0000000000010202

-- C level backtrace information -------------------------------------------
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(rb_vm_bugreport+0x53c) [0x55665c15cffc] vm_dump.c:715
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(rb_bug_context+0xe4) [0x55665c1505d4] error.c:609
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(sigsegv+0x42) [0x55665c023cd2] signal.c:998
/lib/x86_64-linux-gnu/libpthread.so.0(__restore_rt+0x0) [0x7fb0bbe770e0]
/home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/nokogiri.so(0x7fb0b7fd8a9f) [0x7fb0b7fd8a9f]
/home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/nokogiri.so(0x7fb0b7fd8ed9) [0x7fb0b7fd8ed9]
/home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/nokogiri.so(set_root+0x5b) [0x7fb0b7f81fab] xml_document.c:144
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(vm_call_cfunc+0x10f) [0x55665c09ce6f] vm_insnhelper.c:1908
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(vm_call_method+0xf3) [0x55665c0a9253] vm_insnhelper.c:2397
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(vm_exec_core+0x147) [0x55665c0afd57] insns.def:765
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(rb_vm_exec+0xa9) [0x55665c0a55b9] vm.c:1885
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(ruby_exec_internal+0xd7) [0x55665bf09f87] eval.c:262
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(ruby_exec_node+0x11) [0x55665bf0ea5b] eval.c:326
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(ruby_run_node) eval.c:318
/home/whirsch/.rbenv/versions/2.6.3/bin/ruby(main+0x5b) [0x55665bf099cb] ./main.c:42

-- Other runtime information -----------------------------------------------

* Loaded script: segfault.rb

* Loaded features:

    0 enumerator.so
    1 thread.rb
    2 rational.so
    3 complex.so
    4 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so
    5 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/x86_64-linux/enc/trans/transdb.so
    6 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/x86_64-linux/rbconfig.rb
    7 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/compatibility.rb
    8 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/defaults.rb
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   10 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/errors.rb
   11 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/version.rb
   12 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/requirement.rb
   13 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/platform.rb
   14 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/basic_specification.rb
   15 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/stub_specification.rb
   16 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/delegate.rb
   17 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/uri/rfc2396_parser.rb
   18 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/uri/rfc3986_parser.rb
   19 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/uri/common.rb
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   30 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/util/list.rb
   31 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/x86_64-linux/stringio.so
   32 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/specification.rb
   33 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/exceptions.rb
   34 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/util.rb
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   64 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/config_file.rb
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  140 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/bundler/stub_specification.rb
  141 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/bundler/endpoint_specification.rb
  142 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/bundler/setup.rb
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  150 /home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/xml/sax/document.rb
  151 /home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/xml/sax/parser_context.rb
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  193 /home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/html.rb
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  195 /home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/css/node.rb
  196 /home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/css/xpath_visitor.rb
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  198 /home/whirsch/.rbenv/versions/2.6.3/lib/ruby/2.6.0/racc/parser.rb
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  205 /home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/html/builder.rb
  206 /home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri.rb

* Process memory map:

55665bee3000-55665c250000 r-xp 00000000 fe:01 3021716                    /home/whirsch/.rbenv/versions/2.6.3/bin/ruby
55665c44f000-55665c454000 r--p 0036c000 fe:01 3021716                    /home/whirsch/.rbenv/versions/2.6.3/bin/ruby
55665c454000-55665c455000 rw-p 00371000 fe:01 3021716                    /home/whirsch/.rbenv/versions/2.6.3/bin/ruby
55665c455000-55665c466000 rw-p 00000000 00:00 0 
55665cab1000-55665d495000 rw-p 00000000 00:00 0                          [heap]
7fb0b5e61000-7fb0b5ffe000 r--s 00000000 fe:01 49676793                   /lib/x86_64-linux-gnu/libc-2.24.so
7fb0b5ffe000-7fb0b605f000 rw-p 00000000 00:00 0 
7fb0b605f000-7fb0b6305000 r--s 00000000 fe:01 663718                     /home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/nokogiri.so
7fb0b6305000-7fb0b74e0000 r--s 00000000 fe:01 3021716                    /home/whirsch/.rbenv/versions/2.6.3/bin/ruby
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7fb0b7f42000-7fb0b8163000 r-xp 00000000 fe:01 663718                     /home/whirsch/source/nokogiri-bug/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/lib/nokogiri/nokogiri.so
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7fb0bb7da000-7fb0bb9d9000 ---p 00003000 fe:01 49676801                   /lib/x86_64-linux-gnu/libdl-2.24.so
7fb0bb9d9000-7fb0bb9da000 r--p 00002000 fe:01 49676801                   /lib/x86_64-linux-gnu/libdl-2.24.so
7fb0bb9da000-7fb0bb9db000 rw-p 00003000 fe:01 49676801                   /lib/x86_64-linux-gnu/libdl-2.24.so
7fb0bb9db000-7fb0bba5c000 r-xp 00000000 fe:01 39850797                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7fb0bba5c000-7fb0bbc5c000 ---p 00081000 fe:01 39850797                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7fb0bbc5c000-7fb0bbc5d000 r--p 00081000 fe:01 39850797                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7fb0bbc5d000-7fb0bbc5e000 rw-p 00082000 fe:01 39850797                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7fb0bbc5e000-7fb0bbc65000 r-xp 00000000 fe:01 49676861                   /lib/x86_64-linux-gnu/librt-2.24.so
7fb0bbc65000-7fb0bbe64000 ---p 00007000 fe:01 49676861                   /lib/x86_64-linux-gnu/librt-2.24.so
7fb0bbe64000-7fb0bbe65000 r--p 00006000 fe:01 49676861                   /lib/x86_64-linux-gnu/librt-2.24.so
7fb0bbe65000-7fb0bbe66000 rw-p 00007000 fe:01 49676861                   /lib/x86_64-linux-gnu/librt-2.24.so
7fb0bbe66000-7fb0bbe7e000 r-xp 00000000 fe:01 49676857                   /lib/x86_64-linux-gnu/libpthread-2.24.so
7fb0bbe7e000-7fb0bc07d000 ---p 00018000 fe:01 49676857                   /lib/x86_64-linux-gnu/libpthread-2.24.so
7fb0bc07d000-7fb0bc07e000 r--p 00017000 fe:01 49676857                   /lib/x86_64-linux-gnu/libpthread-2.24.so
7fb0bc07e000-7fb0bc07f000 rw-p 00018000 fe:01 49676857                   /lib/x86_64-linux-gnu/libpthread-2.24.so
7fb0bc07f000-7fb0bc083000 rw-p 00000000 00:00 0 
7fb0bc083000-7fb0bc09c000 r-xp 00000000 fe:01 49676378                   /lib/x86_64-linux-gnu/libz.so.1.2.8
7fb0bc09c000-7fb0bc29b000 ---p 00019000 fe:01 49676378                   /lib/x86_64-linux-gnu/libz.so.1.2.8
7fb0bc29b000-7fb0bc29c000 r--p 00018000 fe:01 49676378                   /lib/x86_64-linux-gnu/libz.so.1.2.8
7fb0bc29c000-7fb0bc29d000 rw-p 00019000 fe:01 49676378                   /lib/x86_64-linux-gnu/libz.so.1.2.8
7fb0bc29d000-7fb0bc2c0000 r-xp 00000000 fe:01 49676292                   /lib/x86_64-linux-gnu/ld-2.24.so
7fb0bc2f0000-7fb0bc48b000 r--p 00000000 fe:01 39861030                   /usr/lib/locale/locale-archive
7fb0bc48b000-7fb0bc491000 rw-p 00000000 00:00 0 
7fb0bc497000-7fb0bc4b9000 r--s 00000000 fe:01 49676857                   /lib/x86_64-linux-gnu/libpthread-2.24.so
7fb0bc4b9000-7fb0bc4c0000 r--s 00000000 fe:01 39883666                   /usr/lib/x86_64-linux-gnu/gconv/gconv-modules.cache
7fb0bc4c0000-7fb0bc4c1000 r--p 00023000 fe:01 49676292                   /lib/x86_64-linux-gnu/ld-2.24.so
7fb0bc4c1000-7fb0bc4c2000 rw-p 00024000 fe:01 49676292                   /lib/x86_64-linux-gnu/ld-2.24.so
7fb0bc4c2000-7fb0bc4c3000 rw-p 00000000 00:00 0 
7ffd1e066000-7ffd1e865000 rw-p 00000000 00:00 0                          [stack]
7ffd1e9c9000-7ffd1e9cb000 r--p 00000000 00:00 0                          [vvar]
7ffd1e9cb000-7ffd1e9cd000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: https://www.ruby-lang.org/bugreport.html

In the unlikely event it matters, I'm running through rbenv exec bundle exec ruby segfault.rb

flavorjones commented 5 years ago

Thanks for reporting. I will look into it in the next couple of days. In the meantime, if you tell me what you're trying to do I may be able to suggest a workaround.

flavorjones commented 4 years ago

Note that the JRuby implementation does the right thing by raising an exception; we need to do the same in the CRuby implementation. Alternatively, we should have a Ruby wrapper for the extension implementation that does this type check consistently across both. Targetting v1.11.0.

flavorjones commented 3 years ago

Sorry for the delay, this will be fixed in the next release (see #2210).