https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120541
Bug ID: 120541
Summary: Stack Overflow in c++filt's Rust demangler
(demangle_path <-> eat mutual recursion)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: plugins
Assignee: unassigned at gcc dot gnu.org
Reporter: xdcao.cs at gmail dot com
Target Milestone: ---
Summary
A malformed Rust mangled symbol causes a stack overflow in the mutual recursion
between demangle_path() and eat() in libiberty/rust-demangle.c. Triggered via
c++filt -r, this crash results in denial of service and may pose a risk in
contexts where demangling occurs automatically (e.g., debugging tools, CI/CD
pipelines).
The demangler repeatedly recurses between demangle_path() and eat() with no
maximum depth check. When crafted input causes these functions to call each
other indefinitely, stack memory is exhausted.
Environment
GNU Binutils version: 2.44.50 & master
OS: Ubuntu 22.04.5 LTS
Steps to reproduce
# export CFLAGS="-g -O0 -fno-inline -fno-lto -fsanitize=address"
# export CXXFLAGS="-g -O0 -fno-inline -fno-lto -fsanitize=address"
# ./configure --disable-werror --enable-targets=all --enable-gold[=yes]
# make -j64 & make install
root@46b925a575de:# ./c++filt -i -r -s auto @POC
AddressSanitizer:DEADLYSIGNAL
=================================================================
==512814==ERROR: AddressSanitizer: stack-overflow on address 0x7fff44b1bff8 (pc
0x0000008a5631 bp 0x7fff44b1c190 sp 0x7fff44b1c000 T0)
#0 0x8a5631 in eat
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:98
#1 0x8a7e4f in parse_integer_62
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:125:7
#2 0x8a47fe in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:781:17
#3 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#4 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#5 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#6 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#7 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#8 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#9 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#10 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#11 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#12 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#13 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#14 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#15 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#16 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#17 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#18 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#19 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#20 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#21 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#22 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#23 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#24 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#25 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#26 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#27 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#28 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#29 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#30 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#31 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#32 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#33 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#34 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#35 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#36 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#37 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#38 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#39 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#40 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#41 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#42 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#43 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#44 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#45 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#46 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#47 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#48 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#49 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#50 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#51 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#52 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#53 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#54 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#55 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#56 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#57 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#58 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#59 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#60 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#61 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#62 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#63 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#64 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#65 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#66 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#67 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#68 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#69 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#70 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#71 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#72 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#73 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#74 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#75 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#76 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#77 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#78 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#79 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#80 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#81 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#82 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#83 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#84 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#85 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#86 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#87 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#88 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#89 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#90 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#91 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#92 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#93 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#94 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#95 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#96 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#97 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#98 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#99 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#100 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#101 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#102 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#103 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#104 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#105 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#106 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#107 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#108 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#109 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#110 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#111 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#112 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#113 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#114 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#115 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#116 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#117 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#118 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#119 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#120 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#121 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#122 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#123 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#124 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#125 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#126 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#127 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#128 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#129 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#130 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#131 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#132 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#133 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#134 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#135 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#136 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#137 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#138 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#139 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#140 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#141 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#142 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#143 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#144 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#145 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
#146 0x8a488d in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:786:11
#147 0x8a4983 in demangle_path
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:708:7
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#234 0x8a488d in demangle_path
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#235 0x8a4983 in demangle_path
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#236 0x8a488d in demangle_path
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#237 0x8a4983 in demangle_path
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#238 0x8a488d in demangle_path
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#239 0x8a4983 in demangle_path
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#240 0x8a488d in demangle_path
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#241 0x8a4983 in demangle_path
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#242 0x8a488d in demangle_path
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#243 0x8a4983 in demangle_path
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#244 0x8a488d in demangle_path
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#245 0x8a4983 in demangle_path
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#246 0x8a488d in demangle_path
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#247 0x8a4983 in demangle_path
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#248 0x8a488d in demangle_path
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SUMMARY: AddressSanitizer: stack-overflow
/root/this-program/binutils-gdb/build/libiberty/../../libiberty/rust-demangle.c:98
in eat
==512814==ABORTING
POC
https://drive.google.com/file/d/1kqBV68VZxqnpR8gcrNej8-0BZhlbtJ5V/view?usp=sharing
Redit
Xiaoguo Li (CUPL)
Xudong Cao (UCAS)
