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feat: implement GamePak out-of-bounds reads

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-04-08 02:34:08 -03:00
parent a1008738d2
commit 6df55c2d86
1 changed files with 17 additions and 4 deletions
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21
src/bus/GamePak.zig
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@ -3,6 +3,9 @@ const std = @import("std");
const Backup = @import("backup.zig").Backup; const Backup = @import("backup.zig").Backup;
const Allocator = std.mem.Allocator; const Allocator = std.mem.Allocator;
const log = std.log.scoped(.GamePak); const log = std.log.scoped(.GamePak);
const intToBytes = @import("../util.zig").intToBytes;
const Self = @This(); const Self = @This();
title: [12]u8, title: [12]u8,
@ -14,11 +17,21 @@ pub fn init(alloc: Allocator, rom_path: []const u8, save_path: ?[]const u8) !Sel
const file = try std.fs.cwd().openFile(rom_path, .{}); const file = try std.fs.cwd().openFile(rom_path, .{});
defer file.close(); defer file.close();
const len = try file.getEndPos(); const file_buf = try file.readToEndAlloc(alloc, try file.getEndPos());
const buf = try file.readToEndAlloc(alloc, len); defer alloc.free(file_buf);
const title = parseTitle(buf);
const kind = Backup.guessKind(buf) orelse .Sram; const title = parseTitle(file_buf);
const kind = Backup.guessKind(file_buf) orelse .Sram;
const buf = try alloc.alloc(u8, 0x200_0000); // 32MiB
// GamePak addressable space has known values if there's no cartridge inserted
var i: usize = 0;
while (i < buf.len) : (i += @sizeOf(u16)) {
std.mem.copy(u8, buf[i..][0..2], &intToBytes(u16, @truncate(u16, i / 2)));
}
std.mem.copy(u8, buf[0..file_buf.len], file_buf[0..file_buf.len]); // Copy over ROM
const pak = Self{ const pak = Self{
.buf = buf, .buf = buf,