On Fri, May 18, 2018 at 2:30 PM MK <marcin...@gmail.com> wrote:
> Hi kcc,
>
> Thanks for your hint. It did get me further to some point.
>
> I successfully compiled Ruby, libxml2, libxst and Nokogiri with ASan, but
> when I run it I still get:
>
> ./ruby ../script.rb
> Traceback (most recent call last):
> 7: from ../script.rb:1:in `<main>'
> 6: from
> /usr/local/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:39:in
> `require'
> 5: from
> /usr/local/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in
> `rescue in require'
> 4: from
> /usr/local/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in
> `require'
> 3: from
> /usr/local/lib/ruby/gems/2.5.0/gems/nokogiri-1.8.0/lib/nokogiri.rb:28:in
> `<top (required)>'
> 2: from
> /usr/local/lib/ruby/gems/2.5.0/gems/nokogiri-1.8.0/lib/nokogiri.rb:32:in
> `rescue in <top (required)>'
> 1: from
> /usr/local/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in
> `require'
> /usr/local/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in
> `require': /usr/local/lib/libxml2.so.2: undefined symbol: __asan_init -
> /usr/local/lib/ruby/gems/2.5.0/gems/nokogiri-1.8.0/lib/nokogiri/nokogiri.so
> (LoadError)
>
Please provide mode details:
OS version
glibc version
compiler version (also, GCC or Clang?)
exact build flags
Also, what does the
/usr/local/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb
do?
Maybe it's just asking for too much? Maybe you should just relax the checks
made by this tool.
When you build libxml2.so.2 with asan, the library get a call
to __asan_init (and other similar functions) and those functions are not
present in the library -- only in the binary.
>
> Any ideas?
>
> Any body with Ruby experience and enabling ASan for Ruby Gems?
>
> Thanks,
>
> On Friday, May 18, 2018 at 10:16:00 PM UTC+2, kcc wrote:
>>
>> I have zero experience with Ruby, but if it is any similar to Python then
>> my recommendation is to build Ruby with AddressSanitizer.
>> If the build breaks with an LSAN report, just disable LSAN during the
>> build (ASAN_OPTIONS=detect_leaks=0)
>>
>> --kcc
>>
>>
>>
>> On Fri, May 18, 2018 at 3:15 AM MK <marc...@gmail.com> wrote:
>>
>>> Hi all,
>>>
>>> I am trying to compile Address Sanitizer in nokogiri Ruby gem.
>>>
>>> Compiled libxml2 and libxslt with Address Sanitizer like this:
>>>
>>> ./configure CFLAGS="-fsanitize=address,undefined -Wformat
>>> -Werror=format-security -Werror=array-bounds -g"
>>> CXXFLAGS="-fsanitize=address,undefined -Wformat -Werror=format-security
>>> -Werror=array-bounds -g" LDFLAGS="-fsanitize=address,undefined" CC="clang"
>>> CXX="clang++"
>>>
>>>
>>> And installed gem like this:
>>>
>>> sudo gem install nokogiri --version 1.8.0 -- --use-system-libraries
>>> --with-xml2-include=/home/user/Downloads/libxml2-2.9.3/include/
>>> --with-xml2-lib=/usr/local/lib/ --with-cflags=\"-fsanitize=address\"
>>> --with-ldflags=\"-fsanitize=address -lasan -lubsan\"
>>> --with-xslt-include=/home/user/Downloads/libxslt-1.1.28/
>>>
>>>
>>> However when I run sample Ruby script using Nokogiri
>>>
>>> script.rb
>>> #!/usr/bin/ruby
>>> require 'nokogiri'
>>> doc = File.open("sample.xml") { |f| Nokogiri::XML(f) }
>>>
>>>
>>> I get this message:
>>>
>>> ./script.rb ==30473==ASan runtime does not come first in initial library
>>> list; you should either link runtime to your application or manually
>>> preload it with LD_PRELOAD.
>>>
>>>
>>> When I do the preload:
>>>
>>>
>>> LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libasan.so.2 ./script.rb
>>> /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
>>> `require':
>>> /var/lib/gems/2.3.0/gems/nokogiri-1.8.0/lib/nokogiri/nokogiri.so: undefined
>>> symbol: __asan_init -
>>> /var/lib/gems/2.3.0/gems/nokogiri-1.8.0/lib/nokogiri/nokogiri.so (LoadError)
>>> from
>>> /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
>>> from
>>> /var/lib/gems/2.3.0/gems/nokogiri-1.8.0/lib/nokogiri.rb:32:in `rescue in
>>> <top (required)>'
>>> from
>>> /var/lib/gems/2.3.0/gems/nokogiri-1.8.0/lib/nokogiri.rb:28:in `<top
>>> (required)>'
>>> from
>>> /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:127:in `require'
>>> from
>>> /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:127:in `rescue in
>>> require'
>>> from
>>> /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:40:in `require'
>>> from ./script.rb:2:in `<main>'
>>>
>>> =================================================================
>>> ==30485==ERROR: LeakSanitizer: detected memory leaks
>>>
>>> Direct leak of 319176 byte(s) in 4259 object(s) allocated from:
>>> #0 0x7fce9ea4579a in __interceptor_calloc
>>> (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x9879a)
>>> #1 0x7fce9e5b4383 in ruby_xcalloc
>>> (/usr/lib/x86_64-linux-gnu/libruby-2.3.so.2.3+0x85383)
>>>
>>> .
>>> .
>>> .
>>> Do I have to build Ruby also with Address Sanitizer? Which unfortunately
>>> fails ...
>>>
>>> cd ruby-2.3.0
>>> ./configure --disable-shared CFLAGS="-fsanitize=address -ggdb"
>>> CXXFLAGS="-fsanitize=address -ggdb"
>>> make
>>> Breaks upon compilation, showing Memory Leak :/
>>>
>>> How do I correctly enable Address Sanitizer in Ruby, on Ruby Gem?
>>>
>>> Thanks,
>>>
>>>
>>>
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