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Bug #7957

closed

rb_str_modify() does not prevent shared string from rb_str_set_len()

Added by normalperson (Eric Wong) almost 10 years ago. Updated over 9 years ago.

Status:
Third Party's Issue
Priority:
Normal
Target version:
ruby -v:
ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]
Backport:
[ruby-core:52876]

Description

unicorn HTTP chunk parser may raise "can't set length of shared string (RuntimeError)" in rb_str_set_len().
However, it does call rb_str_modify() before calling rb_str_set_len().

To reproduce:
git clone git://bogomips.org/unicorn
cd unicorn
gem install isolate # needed for unicorn dependencies
git reset --hard v4.6.1
make http # build HTTP parser (needs ragel installed: apt-get install ragel)
ruby -I lib str_modify.rb # failure, raises

apply unicorn_http.patch

patch -p1 < unicorn_http.patch
make http # rebuild parser
ruby -I lib str_modify.rb # success (no output)

In my proposed patch, I call rb_str_resize() instead of rb_str_set_len() and that seems to
work around the issue. I even call rb_str_modify() an extra time before rb_str_set_len(),
but rb_str_set_len() still raises...


Files

str_modify.rb (408 Bytes) str_modify.rb script to reproduce the issue (requires unicorn) normalperson (Eric Wong), 02/25/2013 09:54 PM
unicorn_http.patch (931 Bytes) unicorn_http.patch proposed patch to unicorn normalperson (Eric Wong), 02/25/2013 09:54 PM
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