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Disallow recursive library cells (#868)

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* Disallow recursive library cells

* Stop emulation of external messages on accept

---------

Co-authored-by: SpyCheese <mikle98@yandex.ru>
This commit is contained in:
EmelyanenkoK 2024-01-22 12:34:49 +03:00 • committed by GitHub
parent 128a85bee5
commit 42d4c051ef
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7 changed files with 50 additions and 0 deletions
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31
crypto/vm/cellops.cpp
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@ -892,6 +892,37 @@ int exec_load_special_cell(VmState* st, bool quiet) {
Stack& stack = st->get_stack();
VM_LOG(st) << "execute XLOAD" << (quiet ? "Q" : "");
auto cell = stack.pop_cell();
auto r_loaded_cell = cell->load_cell();
if (r_loaded_cell.is_error()) {
if (quiet) {
stack.push_bool(false);
return 0;
} else {
throw VmError{Excno::cell_und, "failed to load cell"};
}
}
auto loaded_cell = r_loaded_cell.move_as_ok();
if (loaded_cell.data_cell->is_special()) {
if (loaded_cell.data_cell->special_type() != CellTraits::SpecialType::Library) {
if (quiet) {
stack.push_bool(false);
return 0;
} else {
throw VmError{Excno::cell_und, "unexpected special cell"};
}
}
CellSlice cs(std::move(loaded_cell));
DCHECK(cs.size() == Cell::hash_bits + 8);
cell = st->load_library(cs.data_bits() + 8);
if (cell.is_null()) {
if (quiet) {
stack.push_bool(false);
return 0;
} else {
throw VmError{Excno::cell_und, "failed to load library cell"};
}
}
}
stack.push_cell(cell);
if (quiet) {
stack.push_bool(true);