Hooking multiple functions causes SEGV

[steve-lorimer]

I'm trying to hook the posix socket api

elf_hook(handle, base_address, "socket", hook_socket);
elf_hook(handle, base_address, "bind", hook_bind);
elf_hook(handle, base_address, "connect", hook_connect);
elf_hook(handle, base_address, "getpeername", hook_getpeername);
elf_hook(handle, base_address, "getsockname", hook_getsockname);
elf_hook(handle, base_address, "getsockopt", hook_getsockopt);
elf_hook(handle, base_address, "listen", hook_listen);
elf_hook(handle, base_address, "recv", hook_recv);
elf_hook(handle, base_address, "recvfrom", hook_recvfrom);
elf_hook(handle, base_address, "recvmsg", hook_recvmsg);
elf_hook(handle, base_address, "send", hook_send);
elf_hook(handle, base_address, "sendmsg", hook_sendmsg);
elf_hook(handle, base_address, "sendto", hook_sendto);
elf_hook(handle, base_address, "setsockopt", hook_setsockopt);
elf_hook(handle, base_address, "shutdown", hook_shutdown);
elf_hook(handle, base_address, "socketpair", hook_socketpair);

I can hook the first 6 functions

hooked(socket) original_function(0x7f8279c3c936)
hooked(bind) original_function(0xff04f3a7a808)
hooked(connect) original_function(0x4a8e56)
hooked(getpeername) original_function(0x4a8ff0)
hooked(getsockname) original_function(0x4a9126)
hooked(getsockopt) original_function(0x4a92c7)

and then it seg faults

#0  0x00000000004b2b59 in elf_hook \
    (module_filename=0x1498200 "/src/build/elfhook/libtest_api.so", \
     module_address=0x7f8279c3c000, \
     name=0x5671b2 "listen", \
     substitution=0x4a96a5 <hook_listen(int, int)>) at /src/elfhook/elf_hook.c:479
479             *(size_t *)(((size_t)module_address) + rel_plt_table[i].r_offset) = (size_t)substitution;  \
    //and replace it with the substitutional