Issue #22322 has been reported by 0599jiangyc@gmail.com (Yuancheng Jiang). ---------------------------------------- Bug #22322: AddressSanitizer: use-after-poison in econv_description /ruby-src/build/../transcode.c https://bugs.ruby-lang.org/issues/22322 * Author: 0599jiangyc@gmail.com (Yuancheng Jiang) * Status: Open * Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- The following program: ```ruby ec = Encoding::Converter.new("", "xml_attr_content_escape") begin ec.dup.freeze; ec.clone(freeze: false); GC.start(full_mark: true, immediate_sweep: true); ObjectSpace.each_object(ec.class).first(50).each(&:inspect); rescue Exception; end # dataflow fusion ``` makes the interpreter report: ``` ================================================================= ==1596291==ERROR: AddressSanitizer: use-after-poison on address 0x79ce1cfff1f8 at pc 0x60e57424f1e5 bp 0x7ffd8f1a9020 sp 0x7ffd8f1a9018 READ of size 1 at 0x79ce1cfff1f8 thread T0 #0 0x60e57424f1e4 in econv_description /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../transcode.c:2069:9 #1 0x60e574254cfd in econv_inspect /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../transcode.c:3572:9 #2 0x60e57430c9b9 in vm_call0_cfunc_with_frame /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_eval.c:164:15 #3 0x60e57430c9b9 in vm_call0_cfunc /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_eval.c:178:12 #4 0x60e57430c9b9 in vm_call0_body /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_eval.c:229:15 #5 0x60e57430f704 in vm_call0_cc /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_eval.c:101:12 #6 0x60e57430f704 in rb_call0 /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_eval.c:577:12 #7 0x60e5742c0b7c in rb_call /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_eval.c:896:12 #8 0x60e5742c0b7c in rb_funcall_with_block_kw /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_eval.c:1216:12 #9 0x60e574313e8e in vm_yield_with_symbol /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_insnhelper.c:5291:16 #10 0x60e5743134e1 in invoke_block_from_c_bh /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm.c:1912:16 #11 0x60e5742c10b3 in vm_yield_with_cref /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm.c:1946:12 #12 0x60e5742c10b3 in vm_yield /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm.c:1954:12 #13 0x60e5742c10b3 in rb_ec_yield /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_eval.c #14 0x60e57437fa35 in rb_ary_each /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../array.c:2792:9 #15 0x60e5742f720a in vm_call_cfunc_with_frame_ /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_insnhelper.c:3904:11 #16 0x60e5742e14b9 in vm_call_method_each_type /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_insnhelper.c:4896:16 #17 0x60e5742e0c4e in vm_call_method /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_insnhelper.c #18 0x60e5742a59ea in vm_sendish /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm_insnhelper.c:6283:15 #19 0x60e5742a59ea in vm_exec_core /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../insns.def:864:11 #20 0x60e57428dbe1 in rb_vm_exec /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../vm.c:2881:22 #21 0x60e573ee5c1c in rb_ec_exec_node /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/ruby-src/build/../eval.c:299:9 #22 0x60e573ee5c1c in ruby_r ``` To reproduce: ``` /home/fuzz/WorkSpace/fusion-fuzz/projects/ruby/install/bin/ruby --disable-gems --parser=parse.y /tmp/test.rb ``` Commit: ``` 3296d5c99ce005e4698fb27a405e01d766ad2647 ``` Build configuration: ``` ../configure --prefix=... CC=clang-18 cflags="-fsanitize=address -fno-omit-frame-pointer -DUSE_MN_THREADS=0" cppflags="-DRUBY_DEBUG=1" optflags="-O1" ``` Operating System: ``` Ubuntu 24.04 host, Docker ffe-ruby:latest ``` *This bug was found by [fusion-fuzz](https://github.com/fusion-fuzz/fusion-fuzz)* -- https://bugs.ruby-lang.org/