* Mathieu Desnoyers: > But my original issue remains: if I define a variable called __rseq_handled > within either the main executable or the preloaded library, it overshadows > the libc one: > > efficios@compudjdev:~/test/libc-sym$ ./a > __rseq_handled main: 0 0x56135fd5102c > __rseq_abi.cpu_id main: 29 0x7fcbeca6d5a0 > efficios@compudjdev:~/test/libc-sym$ LD_PRELOAD=./s.so ./a > __rseq_handled s.so: 0 0x558f70aeb02c > __rseq_abi.cpu_id s.so: -1 0x7fdca78b7760 > __rseq_handled main: 0 0x558f70aeb02c > __rseq_abi.cpu_id main: 27 0x7fdca78b7760 > > Which is unexpected.
Why is this unexpected? It has to be this way if the main program uses a copy relocation of __rseq_handled. As long as there is just one address across the entire program and ld.so initializes the copy of the variable that is actually used, everything will be fine. Thanks, Florian
