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bios: making sure no internal vars of the bios would leak into the userspace

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minjaesong
2021-10-02 13:28:58 +09:00
parent e252a03cd7
commit f049a22238
1 changed files with 5 additions and 3 deletions
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8
assets/bios/tsvmbios.js
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@@ -58,7 +58,7 @@ con.move(21,(80-uramstr.length)/2);println(uramstr);
// probe bootable device // probe bootable device
var _BIOS = {}; /*var _BIOS = {};
// Syntax: [Port, Drive-number] // Syntax: [Port, Drive-number]
// Port #0-3: Serial port 1-4 // Port #0-3: Serial port 1-4
@@ -66,7 +66,7 @@ var _BIOS = {};
// Drive-number always starts at 1 // Drive-number always starts at 1
_BIOS.FIRST_BOOTABLE_PORT = [0,1]; // ah screw it _BIOS.FIRST_BOOTABLE_PORT = [0,1]; // ah screw it
Object.freeze(_BIOS); Object.freeze(_BIOS);*/
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
@@ -92,7 +92,9 @@ while (portNumber < 4) {
portNumber += 1; portNumber += 1;
} }
if (portNumber < 4) { if (portNumber < 4) {
eval(com.fetchResponse(portNumber).trimNull()); // eval(com.fetchResponse(portNumber).trimNull());
// using Function() so that BIOS variables won't get leaked in
{Function("\"use strict\";var _BIOS={};_BIOS.FIRST_BOOTABLE_PORT=[0,1];Object.freeze(_BIOS);"+com.fetchResponse(portNumber).trimNull())()};
} }
else { else {
printerrln("No bootable medium found."); printerrln("No bootable medium found.");