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Disable loading of Lua bytecode #3

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Merged
git-hulk merged 1 commit into from
May 17, 2026
Merged

Disable loading of Lua bytecode #3

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11 changes: 9 additions & 2 deletions src/lj_load.c
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Original file line number Diff line number Diff line change
Expand Up @@ -34,11 +34,18 @@ static TValue *cpparser(lua_State *L, lua_CFunction dummy, void *ud)
UNUSED(dummy);
cframe_errfunc(L->cframe) = -1; /* Inherit error function. */
bc = lj_lex_setup(L, ls);
if (ls->mode && !strchr(ls->mode, bc ? 'b' : 't')) {
/* Disable loading of Lua bytecode. Untrusted bytecode is unsafe and can
** crash the VM or be used for sandbox escapes; see the LuaJIT FAQ.
*/
if (bc) {
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_XMODE));
lj_err_throw(L, LUA_ERRSYNTAX);
}
pt = bc ? lj_bcread(ls) : lj_parse(ls);
if (ls->mode && !strchr(ls->mode, 't')) {
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_XMODE));
lj_err_throw(L, LUA_ERRSYNTAX);
}
pt = lj_parse(ls);
fn = lj_func_newL_empty(L, pt, tabref(L->env));
/* Don't combine above/below into one statement. */
setfuncV(L, L->top++, fn);
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