main.cpp
#include "string"
#include "unordered_map"
#include "iostream"
#include "dlfcn.h"
typedef void x(std::unordered_map<std::string, std::string> &);
int main(int argc, char **argv)
{
auto handle = dlopen("./test3.so", RTLD_NOW);
if(!handle)
{
std::cout << dlerror() << std::endl;
return -1;
}
x *x;
*(void **)&x = dlsym(handle, "x");
// std::unordered_map<std::string, std::string> result; //ok
std::unordered_map<std::string, std::string> result; //failed if not dynamic link test3.so
x(result);
std::cout << result["x"] << std::endl;
dlclose(handle);
return 0;
}
test3.cpp
#include "unordered_map"
#include "string"
#ifdef __cplusplus
extern "C"
{
#endif
void x(std::unordered_map<std::string, std::string> &result)
{
result["x"] = "Hello, world";
}
#ifdef __cplusplus
}
#endif
if main.cpp build with gcc-11 while test3.cpp with gcc-4.8, the program would crash.
g++ -g -fpic -shared test3.cpp -o test3.so //g++ version is 4.8
g++ -g main.cpp -ldl //g++ version is 11
[zrar@CentOS7 cpp]$ ./a.out
*** Error in `./a.out': munmap_chunk(): invalid pointer: 0x00007ffd3747f020 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7340f)[0x7f2d328b340f]
/lib64/libc.so.6(+0x78c7e)[0x7f2d328b8c7e]
./test3.so(_ZN9__gnu_cxx13new_allocatorIPNSt8__detail15_Hash_node_baseEE10deallocateEPS3_m+0x20)[0x7f2d3263d506]
./test3.so(_ZNSt10_HashtableISsSt4pairIKSsSsESaIS2_ENSt8__detail10_Select1stESt8equal_toISsESt4hashISsENS4_18_Mod_range_hashingENS4_20_Default_ranged_hashENS4_20_Prime_rehash_policyENS4_17_Hashtable_traitsILb1ELb0ELb1EEEE21_M_deallocate_bucketsEPPNS4_15_Hash_node_baseEm+0x4a)[0x7f2d3263d342]
./test3.so(_ZNSt10_HashtableISsSt4pairIKSsSsESaIS2_ENSt8__detail10_Select1stESt8equal_toISsESt4hashISsENS4_18_Mod_range_hashingENS4_20_Default_ranged_hashENS4_20_Prime_rehash_policyENS4_17_Hashtable_traitsILb1ELb0ELb1EEEE13_M_rehash_auxEmSt17integral_constantIbLb1EE+0x188)[0x7f2d3263d08a]
./test3.so(_ZNSt10_HashtableISsSt4pairIKSsSsESaIS2_ENSt8__detail10_Select1stESt8equal_toISsESt4hashISsENS4_18_Mod_range_hashingENS4_20_Default_ranged_hashENS4_20_Prime_rehash_policyENS4_17_Hashtable_traitsILb1ELb0ELb1EEEE9_M_rehashEmRKm+0x2b)[0x7f2d3263cb4f]
./test3.so(_ZNSt10_HashtableISsSt4pairIKSsSsESaIS2_ENSt8__detail10_Select1stESt8equal_toISsESt4hashISsENS4_18_Mod_range_hashingENS4_20_Default_ranged_hashENS4_20_Prime_rehash_policyENS4_17_Hashtable_traitsILb1ELb0ELb1EEEE21_M_insert_unique_nodeEmmPNS4_10_Hash_nodeIS2_Lb1EEE+0x85)[0x7f2d3263c7eb]
./test3.so(_ZNSt8__detail9_Map_baseISsSt4pairIKSsSsESaIS3_ENS_10_Select1stESt8equal_toISsESt4hashISsENS_18_Mod_range_hashingENS_20_Default_ranged_hashENS_20_Prime_rehash_policyENS_17_Hashtable_traitsILb1ELb0ELb1EEELb1EEixEOSs+0xc2)[0x7f2d3263c3b6]
./test3.so(_ZNSt13unordered_mapISsSsSt4hashISsESt8equal_toISsESaISt4pairIKSsSsEEEixEOSs+0x2e)[0x7f2d3263c2f2]
./test3.so(x+0x43)[0x7f2d3263c138]
./a.out[0x40279a]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f2d32861ac5]
./a.out[0x402661]
======= Memory map: ========
00400000-00402000 r--p 00000000 fd:00 100685803 /home/zrar/Documents/cpp/a.out
00402000-0040a000 r-xp 00002000 fd:00 100685803 /home/zrar/Documents/cpp/a.out
0040a000-0040f000 r--p 0000a000 fd:00 100685803 /home/zrar/Documents/cpp/a.out
0040f000-00410000 r--p 0000e000 fd:00 100685803 /home/zrar/Documents/cpp/a.out
00410000-00411000 rw-p 0000f000 fd:00 100685803 /home/zrar/Documents/cpp/a.out
00aa2000-00ac3000 rw-p 00000000 00:00 0 [heap]
7f2d32636000-7f2d3263f000 r-xp 00000000 fd:00 100685761 /home/zrar/Documents/cpp/test3.so
7f2d3263f000-7f2d3283e000 ---p 00009000 fd:00 100685761 /home/zrar/Documents/cpp/test3.so
7f2d3283e000-7f2d3283f000 r--p 00008000 fd:00 100685761 /home/zrar/Documents/cpp/test3.so
7f2d3283f000-7f2d32840000 rw-p 00009000 fd:00 100685761 /home/zrar/Documents/cpp/test3.so
7f2d32840000-7f2d329e2000 r-xp 00000000 fd:00 452646 /usr/lib64/libc-2.18.so
7f2d329e2000-7f2d32be2000 ---p 001a2000 fd:00 452646 /usr/lib64/libc-2.18.so
7f2d32be2000-7f2d32be6000 r--p 001a2000 fd:00 452646 /usr/lib64/libc-2.18.so
7f2d32be6000-7f2d32be8000 rw-p 001a6000 fd:00 452646 /usr/lib64/libc-2.18.so
7f2d32be8000-7f2d32bec000 rw-p 00000000 00:00 0
7f2d32bec000-7f2d32c01000 r-xp 00000000 fd:00 1527643 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f2d32c01000-7f2d32e00000 ---p 00015000 fd:00 1527643 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f2d32e00000-7f2d32e01000 r--p 00014000 fd:00 1527643 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f2d32e01000-7f2d32e02000 rw-p 00015000 fd:00 1527643 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f2d32e02000-7f2d32f03000 r-xp 00000000 fd:00 1459 /usr/lib64/libm-2.18.so
7f2d32f03000-7f2d33102000 ---p 00101000 fd:00 1459 /usr/lib64/libm-2.18.so
7f2d33102000-7f2d33103000 r--p 00100000 fd:00 1459 /usr/lib64/libm-2.18.so
7f2d33103000-7f2d33104000 rw-p 00101000 fd:00 1459 /usr/lib64/libm-2.18.so
7f2d33104000-7f2d331ed000 r-xp 00000000 fd:00 18326 /usr/lib64/libstdc++.so.6.0.19
7f2d331ed000-7f2d333ed000 ---p 000e9000 fd:00 18326 /usr/lib64/libstdc++.so.6.0.19
7f2d333ed000-7f2d333f5000 r--p 000e9000 fd:00 18326 /usr/lib64/libstdc++.so.6.0.19
7f2d333f5000-7f2d333f7000 rw-p 000f1000 fd:00 18326 /usr/lib64/libstdc++.so.6.0.19
7f2d333f7000-7f2d3340c000 rw-p 00000000 00:00 0
7f2d3340c000-7f2d3340e000 r-xp 00000000 fd:00 452582 /usr/lib64/libdl-2.18.so
7f2d3340e000-7f2d3360e000 ---p 00002000 fd:00 452582 /usr/lib64/libdl-2.18.so
7f2d3360e000-7f2d3360f000 r--p 00002000 fd:00 452582 /usr/lib64/libdl-2.18.so
7f2d3360f000-7f2d33610000 rw-p 00003000 fd:00 452582 /usr/lib64/libdl-2.18.so
7f2d33610000-7f2d33630000 r-xp 00000000 fd:00 230826 /usr/lib64/ld-2.18.so
7f2d33812000-7f2d33818000 rw-p 00000000 00:00 0
7f2d3382e000-7f2d33830000 rw-p 00000000 00:00 0
7f2d33830000-7f2d33831000 r--p 00020000 fd:00 230826 /usr/lib64/ld-2.18.so
7f2d33831000-7f2d33832000 rw-p 00021000 fd:00 230826 /usr/lib64/ld-2.18.so
7f2d33832000-7f2d33833000 rw-p 00000000 00:00 0
7ffd37461000-7ffd37482000 rw-p 00000000 00:00 0 [stack]
7ffd375d0000-7ffd375d2000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
Aborted
[zrar@CentOS7 cpp]$ ldd a.out
linux-vdso.so.1 (0x00007ffc793ca000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007ff2ebd37000)
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007ff2eba2f000)
libm.so.6 => /lib64/libm.so.6 (0x00007ff2eb72d000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007ff2eb517000)
libc.so.6 => /lib64/libc.so.6 (0x00007ff2eb16b000)
/lib64/ld-linux-x86-64.so.2 (0x00007ff2ebf3b000)
[zrar@CentOS7 cpp]$ ldd test3.so
linux-vdso.so.1 (0x00007ffeff7c6000)
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fb3c0764000)
libm.so.6 => /lib64/libm.so.6 (0x00007fb3c0462000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fb3c024c000)
libc.so.6 => /lib64/libc.so.6 (0x00007fb3bfea0000)
/lib64/ld-linux-x86-64.so.2 (0x00007fb3c0c76000)
if main.cpp build with test3.so in linking list, the program would run normaly.
g++ -g -fpic -shared test3.cpp -o test3.so //g++ version is 4.8
g++ -g main.cpp -Wl,-rpath,'$ORIGIN' -ldl test3.so //g++ version is 11
[zrar@CentOS7 cpp]$ ./a.out
Hello, world
[zrar@CentOS7 cpp]$ ldd ./a.out
linux-vdso.so.1 (0x00007ffea6bb9000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fd670b7f000)
test3.so => /home/zrar/Documents/cpp/test3.so (0x00007fd670975000)
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fd67066d000)
libm.so.6 => /lib64/libm.so.6 (0x00007fd67036b000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fd670155000)
libc.so.6 => /lib64/libc.so.6 (0x00007fd66fda9000)
/lib64/ld-linux-x86-64.so.2 (0x00007fd670d83000)
[zrar@CentOS7 cpp]$ ldd test3.so
linux-vdso.so.1 (0x00007ffc91596000)
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fc484378000)
libm.so.6 => /lib64/libm.so.6 (0x00007fc484076000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fc483e60000)
libc.so.6 => /lib64/libc.so.6 (0x00007fc483ab4000)
/lib64/ld-linux-x86-64.so.2 (0x00007fc48488a000)
In my requirment, I want to dynamicly load a plugin(may be built with other-release gcc) and trans STL object directly(host and plugin are both written in cpp, and wrapping of class in c-style is a complexity work) in plugin interface.
No comments:
Post a Comment