From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 720C33858D37; Sat, 22 Jan 2022 15:20:24 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 720C33858D37 From: "sanjayr at ymail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug demangler/104186] New: Stack overflow in demangle_type() -> print_str() in libiberty/rust-demangle.c:869, cxxfilt Date: Sat, 22 Jan 2022 15:20:24 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: demangler X-Bugzilla-Version: unknown X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: sanjayr at ymail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Jan 2022 15:20:24 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104186 Bug ID: 104186 Summary: Stack overflow in demangle_type() -> print_str() in libiberty/rust-demangle.c:869, cxxfilt Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: demangler Assignee: unassigned at gcc dot gnu.org Reporter: sanjayr at ymail dot com Target Milestone: --- Created attachment 52268 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52268&action=3Dedit Commandline input for the crash (cxxfilt < PoV) Hello, While evaluating our new fuzzer on cxxfilt, we found several stack overflow= s in libiberty/rust-demangle.c. This issue is specific to a stack overflow in demangle_type(), which internally called a macro PRINT() that unfolds in calling to print_str(). Looks like, the copy operation in this function does not check buf length properly. We compiled the utility (binutils cxxfilt) with ASAN.=20 Comandline: cxxfilt < input_file (PoV that is attached) ASan outupt: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D status: 1 sanitizer: ASAN error class: stack-overflow location: __interceptor_strlen.part.0 in /home/xyzz/build/llvm_tools/llvm-11.0.0.src/projects/compiler-rt/lib/asan/.= ./sanitizer_common/sanitizer_common_interceptors.inc:370:31 backtrace: #0 46ec57 __interceptor_strlen.part.0 in /home/xyzz/build/llvm_tools/llvm-11.0.0.src/projects/compiler-rt/lib/asan/.= ./sanitizer_common/sanitizer_common_interceptors.inc:370:31 #1 857cb1 demangle_type in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:869:7 #3 853d83 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:747:7 #4 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #5 8542e4 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:774:11 #6 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #7 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #8 8542e4 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:774:11 #9 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #10 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #11 8542e4 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:774:11 #12 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #13 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #14 8542e4 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:774:11 #15 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #16 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #17 8542e4 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:774:11 #18 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #19 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #20 8542e4 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:774:11 #21 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #22 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #23 8542e4 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:774:11 #24 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #25 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #26 8542e4 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:774:11 #27 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #28 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 #29 8542e4 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:774:11 #30 853e11 demangle_path in /home/xyzz/MyProject/remote_fuzz_suite/target_src/binutils-gdb/build/libibe= rty/../../libiberty/rust-demangle.c:751:11 ..... ....... =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=