[ruby-core:113198] [Ruby master Bug#19593] Crash due to throw data set as cause
From:
"peterzhu2118 (Peter Zhu) via ruby-core" <ruby-core@...>
Date:
2023-04-12 15:51:02 UTC
List:
ruby-core #113198
Issue #19593 has been reported by peterzhu2118 (Peter Zhu).
----------------------------------------
Bug #19593: Crash due to throw data set as cause
https://bugs.ruby-lang.org/issues/19593
* Author: peterzhu2118 (Peter Zhu)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
GitHub PR: https://github.com/ruby/ruby/pull/7696
rb_ec_setup_exception did not check if errinfo is a throw_data. This can cause crashes in code since it is assumed that id_cause is an object.
We saw a crash in show_cause due to id_cause of errinfo being a throw_data. It crashes on rb_obj_is_kind_of since it cannot be called on T_IMEMO objects.
Unfortunately, we couldn't find a reproduction script, however we debugged the core dump and rb_ec_setup_exception is the only place where id_cause is assigned from errinfo without checking if it is a throw_data.
```
0x0000556c5708e6dd in sigsegv (sig=11, info=0x7f301befa3f0, ctx=0x7f301befa2c0) at signal.c:964
0x00007f301d046420 in <signal handler called> () at /lib/x86_64-linux-gnu/libpthread.so.0
class_search_class_ancestor (c=139844586301760, cl=<optimized out>) at object.c:810
rb_obj_is_kind_of (obj=obj@entry=139839221734880, c=139844586301760) at object.c:861
0x0000556c56f2f00f in show_cause
(errinfo=errinfo@entry=139838840645160, str=str@entry=139839221730520, opt=139839221730480, highlight=0, reverse=reverse@entry=0, backtrace_limit=backtrace_limit@entry=-1, shown_causes=0x7ffe9d1a2d68) at ./include/ruby/internal/special_consts.h:175
```
--
https://bugs.ruby-lang.org/
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