void* safemem_read_pid_to_null(pid_data& pdata, uintptr_t remote_addr) {
size_t max_size;
char* wptr = safe_mem_allocator.allocate_largest(&max_size);
if(!wptr) {
return NULL;
}
for(size_t i = 0; ; ) {
uintptr_t a = (remote_addr + i) & (sizeof(long) - 1);
errno = 0;
long v = ptrace(PTRACE_PEEKDATA, pdata.pid, remote_addr + i - a, NULL);
if(errno == EFAULT) {
return NULL;
}
char* vptr = (char*)&v + a;
for(size_t ie = i + sizeof(long) - a; i != ie; i++, vptr++) {
if(!(wptr[i] = *vptr)) {
size_t sz = ((i + 8) & ~0x7);
safe_mem_allocator.free(wptr + sz, max_size - sz);
pdata.allocations.push_back(std::make_pair(wptr, sz));
return wptr;
} else if(i + 1 == max_size) {
safe_mem_allocator.free(wptr, max_size);
return NULL;
}
}
}
}
void safemem_reset(pid_data& pdata) {
for(auto i : pdata.allocations) {
safe_mem_allocator.free(i.first, i.second);
}
pdata.allocations.clear();
}