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* [Bug dynamic-link/30118] New: add_to_global_resize crashes when called in a non-base namespace
@ 2023-02-13 11:24 nimaa.hamidi at gmail dot com
2023-02-13 11:27 ` [Bug dynamic-link/30118] " nimaa.hamidi at gmail dot com
0 siblings, 1 reply; 2+ messages in thread
From: nimaa.hamidi at gmail dot com @ 2023-02-13 11:24 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30118
Bug ID: 30118
Summary: add_to_global_resize crashes when called in a non-base
namespace
Product: glibc
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: dynamic-link
Assignee: unassigned at sourceware dot org
Reporter: nimaa.hamidi at gmail dot com
Target Milestone: ---
Calling dlopen with RTLD_GLOBAL flag set results in segfault when it's called
from a non-base namespace. This is due to the fact that add_to_global_resize
does not take into account the global namespace does not exist yet. The
following code reproduces the issue.
--------------
docker run --rm -it ubuntu:devel bash
apt-get update
apt install g++-10
cd ~
cat >a.cpp <<EOF
// a.cpp
#include <iostream>
#include <dlfcn.h>
using namespace std;
int main () {
void * handle = nullptr;
bool mopen = true;
if (mopen) {
cout << "mopening libb.so" << endl;
handle = dlmopen(LM_ID_NEWLM, "libb.so", RTLD_NOW | RTLD_LOCAL);
} else {
cout << "opening libb.so" << endl;
handle = dlopen("libb.so", RTLD_NOW | RTLD_LOCAL);
}
void (*bfunc)();
*(void**)(&bfunc) = dlsym(handle, "bfunc");
bfunc();
return 0;
}
EOF
cat >b.cpp <<EOF
// b.cpp
#include <iostream>
#include <dlfcn.h>
using namespace std;
extern "C" void bfunc() {
cout << "bfunc in b.cpp is being called..." << endl;
void * handle = dlopen("libc.so", RTLD_NOW | RTLD_GLOBAL);
//void * handle = dlopen("libc.so", RTLD_NOW | RTLD_LOCAL);
void (*cfunc)();
*(void**)(&cfunc) = dlsym(handle, "cfunc");
cfunc();
}
EOF
cat >c.cpp <<EOF
// c.cpp
#include <iostream>
using namespace std;
extern "C" void cfunc() {
cout << "cfunc in c.cpp is being called..." << endl;
}
EOF
g++-10 a.cpp -o a -ldl -Wl,-rpath `pwd`
g++-10 b.cpp -o libb.so -shared -fPIC -ldl -Wl,-rpath `pwd`
g++-10 c.cpp -o libc.so -shared -fPIC
--------------
Finally, when running LD_DEBUG=all ./a, it crashes with the following log:
--------------
902: symbol=_ZNSt8ios_base4InitD1Ev; lookup in file=/root/libb.so [1]
902: symbol=_ZNSt8ios_base4InitD1Ev; lookup in
file=/lib/aarch64-linux-gnu/libstdc++.so.6 [1]
902: symbol=__cxa_finalize; lookup in file=/root/libb.so [1]
902: symbol=__cxa_finalize; lookup in
file=/lib/aarch64-linux-gnu/libstdc++.so.6 [1]
902: symbol=__cxa_finalize; lookup in file=/lib/aarch64-linux-gnu/libc.so.6
[1]
902: symbol=_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc; lookup
in file=/root/libb.so [1]
902: symbol=_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc; lookup
in file=/lib/aarch64-linux-gnu/libstdc++.so.6 [1]
902: symbol=_ZNSolsEPFRSoS_E; lookup in file=/root/libb.so [1]
902: symbol=_ZNSolsEPFRSoS_E; lookup in
file=/lib/aarch64-linux-gnu/libstdc++.so.6 [1]
902: symbol=__cxa_atexit; lookup in file=/root/libb.so [1]
902: symbol=__cxa_atexit; lookup in
file=/lib/aarch64-linux-gnu/libstdc++.so.6 [1]
902: symbol=__cxa_atexit; lookup in file=/lib/aarch64-linux-gnu/libc.so.6
[1]
902: symbol=_ZNSt8ios_base4InitC1Ev; lookup in file=/root/libb.so [1]
902: symbol=_ZNSt8ios_base4InitC1Ev; lookup in
file=/lib/aarch64-linux-gnu/libstdc++.so.6 [1]
902: symbol=__gmon_start__; lookup in file=/root/libb.so [1]
902: symbol=__gmon_start__; lookup in
file=/lib/aarch64-linux-gnu/libstdc++.so.6 [1]
902: symbol=__gmon_start__; lookup in file=/lib/aarch64-linux-gnu/libc.so.6
[1]
902: symbol=__gmon_start__; lookup in file=/lib/ld-linux-aarch64.so.1 [0]
902: symbol=__gmon_start__; lookup in file=/lib/aarch64-linux-gnu/libm.so.6
[1]
902: symbol=__gmon_start__; lookup in
file=/lib/aarch64-linux-gnu/libgcc_s.so.1 [1]
902: symbol=__gmon_start__; lookup in file=/root/libc.so [1]
902: symbol=__gmon_start__; lookup in
file=/lib/aarch64-linux-gnu/libstdc++.so.6 [1]
902: symbol=__gmon_start__; lookup in file=/lib/aarch64-linux-gnu/libc.so.6
[1]
902: symbol=__gmon_start__; lookup in file=/lib/aarch64-linux-gnu/libm.so.6
[1]
902: symbol=__gmon_start__; lookup in file=/lib/ld-linux-aarch64.so.1 [0]
902: symbol=__gmon_start__; lookup in
file=/lib/aarch64-linux-gnu/libgcc_s.so.1 [1]
Segmentation fault
--------------
LIBC version:
--------------
$ ldd --version
ldd (Ubuntu GLIBC 2.36-0ubuntu4) 2.36
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper
--------------
The error won’t happen if I dlopen with RTLD_LOCAL in b.cpp rather than
RTLD_GLOBAL. I would appreciate any help on what I’m doing wrong here.
Best,
Nima
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* [Bug dynamic-link/30118] add_to_global_resize crashes when called in a non-base namespace
2023-02-13 11:24 [Bug dynamic-link/30118] New: add_to_global_resize crashes when called in a non-base namespace nimaa.hamidi at gmail dot com
@ 2023-02-13 11:27 ` nimaa.hamidi at gmail dot com
0 siblings, 0 replies; 2+ messages in thread
From: nimaa.hamidi at gmail dot com @ 2023-02-13 11:27 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30118
Nima Hamidi <nimaa.hamidi at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nimaa.hamidi at gmail dot com
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2023-02-13 11:24 [Bug dynamic-link/30118] New: add_to_global_resize crashes when called in a non-base namespace nimaa.hamidi at gmail dot com
2023-02-13 11:27 ` [Bug dynamic-link/30118] " nimaa.hamidi at gmail dot com
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