https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88177
Bug ID: 88177
Summary: Calng detectes undefined behavior in shared_ptr_base.h
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: semi1 at posteo dot de
Target Milestone: ---
Created attachment 45078
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45078&action=edit
main.ii
The clang undefined behavior finds an reference binding to address with
insufficient space in shared_ptr_base.h
gcc -v:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 8.2.0-7ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.2.0 (Ubuntu 8.2.0-7ubuntu1)
clang++-7 -v:
clang version 7.0.0-3 (tags/RELEASE_700/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/8
Candidate multilib: .;@m64
Selected multilib: .;@m64
Program which cause the error:
main.cpp:
#include <memory>
int main()
{
auto sp = std::make_shared<int>(12);
}
Command line to compile:
clang++-7 -std=c++11 -Og -g -fsanitize=undefined -fno-omit-frame-pointer
-fno-rtti main.cpp
Error:
UBSAN_OPTIONS=print_stacktrace=1 ./a.out
/usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/bits/shared_ptr_base.h:514:14:
runtime error: reference binding to address 0x000000434e38 with insufficient
space for an object of type 'const std::type_info'
0x000000434e38: note: pointer points here
00 00 00 00 00 46 4f 69 52 69 45 00 f8 ec 43 00 00 00 00 00 39 4e 43 00 00
00 00 00 01 1b 03 3b
^
#0 0x429c8a in std::_Sp_make_shared_tag::_S_ti()
/usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/bits/shared_ptr_base.h:514:7
#1 0x4299e3 in std::__shared_ptr<int,
(__gnu_cxx::_Lock_policy)2>::__shared_ptr<std::allocator<int>,
int>(std::_Sp_make_shared_tag, std::allocator<int> const&, int&&)
/usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/bits/shared_ptr_base.h:1329:43
#2 0x429822 in std::shared_ptr<int> std::allocate_shared<int,
std::allocator<int>, int>(std::allocator<int> const&, int&&)
/usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/bits/shared_ptr.h:706:14
#3 0x429665 in std::shared_ptr<int> std::make_shared<int, int>(int&&)
/usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/bits/shared_ptr.h:722:14
#4 0x429557 in main /home/jr/src/main.cpp:9:15
#5 0x7f89422fa09a in __libc_start_main
/build/glibc-B9XfQf/glibc-2.28/csu/../csu/libc-start.c:308:16
#6 0x4033c9 in _start (/home/jr/src/a.out+0x4033c9)
Notes:
The error occures only when rtti is disabled. The gcc undefined behavior
sanitizer does not detect anything
