| 1 | package protocol |
| 2 | |
| 3 | import ( |
| 4 | "testing" |
| 5 | ) |
| 6 | |
| 7 | // --------------------------------------------------------------------------- |
| 8 | // Fuzz targets for all decode paths. |
| 9 | // |
| 10 | // Each target feeds arbitrary bytes to a decode function and, if the decode |
| 11 | // succeeds, exercises the result. The invariant: no input may cause a panic. |
| 12 | // --------------------------------------------------------------------------- |
| 13 | |
| 14 | func FuzzDecodeHeader(f *testing.F) { |
| 15 | // Seed with a valid header. |
| 16 | var seed [HeaderSize]byte |
| 17 | h := Header{ |
| 18 | Magic: MagicMsg, Version: Version, HeaderLen: HeaderLen, |
| 19 | Kind: KindRequest, Code: MethodIncrement, PayloadLen: 0, |
| 20 | ItemCount: 1, MessageID: 1, |
| 21 | } |
| 22 | h.Encode(seed[:]) |
| 23 | f.Add(seed[:]) |
| 24 | |
| 25 | // Seed with truncated and zeroed inputs. |
| 26 | f.Add([]byte{}) |
| 27 | f.Add(make([]byte, 31)) |
| 28 | f.Add(make([]byte, 32)) |
| 29 | |
| 30 | f.Fuzz(func(t *testing.T, data []byte) { |
| 31 | hdr, err := DecodeHeader(data) |
| 32 | if err != nil { |
| 33 | return |
| 34 | } |
| 35 | // Exercise the decoded result. |
| 36 | _ = hdr.Magic |
| 37 | _ = hdr.Version |
| 38 | _ = hdr.Kind |
| 39 | _ = hdr.Flags |
| 40 | _ = hdr.Code |
| 41 | _ = hdr.TransportStatus |
| 42 | _ = hdr.PayloadLen |
| 43 | _ = hdr.ItemCount |
| 44 | _ = hdr.MessageID |
| 45 | }) |
| 46 | } |
| 47 | |
| 48 | func FuzzDecodeChunkHeader(f *testing.F) { |
| 49 | var seed [HeaderSize]byte |
| 50 | c := ChunkHeader{ |
| 51 | Magic: MagicChunk, Version: Version, Flags: 0, |
| 52 | MessageID: 1, TotalMessageLen: 256, |
| 53 | ChunkIndex: 0, ChunkCount: 3, ChunkPayloadLen: 100, |
| 54 | } |
| 55 | c.Encode(seed[:]) |
| 56 | f.Add(seed[:]) |
| 57 | |
| 58 | f.Add([]byte{}) |
| 59 | f.Add(make([]byte, 31)) |
| 60 | f.Add(make([]byte, 32)) |
| 61 | |
| 62 | f.Fuzz(func(t *testing.T, data []byte) { |
| 63 | chk, err := DecodeChunkHeader(data) |
| 64 | if err != nil { |
| 65 | return |
| 66 | } |
| 67 | _ = chk.Magic |
| 68 | _ = chk.Version |
| 69 | _ = chk.Flags |
| 70 | _ = chk.MessageID |
| 71 | _ = chk.TotalMessageLen |
| 72 | _ = chk.ChunkIndex |
| 73 | _ = chk.ChunkCount |
| 74 | _ = chk.ChunkPayloadLen |
| 75 | }) |
| 76 | } |
| 77 | |
| 78 | func FuzzDecodeHello(f *testing.F) { |
| 79 | var seed [64]byte |
| 80 | h := Hello{ |
| 81 | LayoutVersion: 1, SupportedProfiles: ProfileBaseline, |
| 82 | PreferredProfiles: ProfileBaseline, |
| 83 | MaxRequestPayloadBytes: 1024, MaxRequestBatchItems: 1, |
| 84 | MaxResponsePayloadBytes: 1024, MaxResponseBatchItems: 1, |
| 85 | AuthToken: 0xABCD, PacketSize: 65536, |
| 86 | } |
| 87 | h.Encode(seed[:]) |
| 88 | f.Add(seed[:44]) |
| 89 | |
| 90 | f.Add([]byte{}) |
| 91 | f.Add(make([]byte, 43)) |
| 92 | f.Add(make([]byte, 44)) |
| 93 | |
| 94 | f.Fuzz(func(t *testing.T, data []byte) { |
| 95 | hello, err := DecodeHello(data) |
| 96 | if err != nil { |
| 97 | return |
| 98 | } |
| 99 | _ = hello.LayoutVersion |
| 100 | _ = hello.Flags |
| 101 | _ = hello.SupportedProfiles |
| 102 | _ = hello.PreferredProfiles |
| 103 | _ = hello.MaxRequestPayloadBytes |
| 104 | _ = hello.MaxRequestBatchItems |
| 105 | _ = hello.MaxResponsePayloadBytes |
| 106 | _ = hello.MaxResponseBatchItems |
| 107 | _ = hello.AuthToken |
| 108 | _ = hello.PacketSize |
| 109 | }) |
| 110 | } |
| 111 | |
| 112 | func FuzzDecodeHelloAck(f *testing.F) { |
| 113 | var seed [64]byte |
| 114 | h := HelloAck{ |
| 115 | LayoutVersion: 1, ServerSupportedProfiles: 0x07, |
| 116 | IntersectionProfiles: 0x05, SelectedProfile: ProfileSHMFutex, |
| 117 | AgreedMaxRequestPayloadBytes: 2048, AgreedMaxRequestBatchItems: 50, |
| 118 | AgreedMaxResponsePayloadBytes: 65536, AgreedMaxResponseBatchItems: 1, |
| 119 | AgreedPacketSize: 32768, |
| 120 | } |
| 121 | h.Encode(seed[:]) |
| 122 | f.Add(seed[:48]) |
| 123 | |
| 124 | f.Add([]byte{}) |
| 125 | f.Add(make([]byte, 47)) |
| 126 | f.Add(make([]byte, 48)) |
| 127 | |
| 128 | f.Fuzz(func(t *testing.T, data []byte) { |
| 129 | ack, err := DecodeHelloAck(data) |
| 130 | if err != nil { |
| 131 | return |
| 132 | } |
| 133 | _ = ack.LayoutVersion |
| 134 | _ = ack.Flags |
| 135 | _ = ack.ServerSupportedProfiles |
| 136 | _ = ack.IntersectionProfiles |
| 137 | _ = ack.SelectedProfile |
| 138 | _ = ack.AgreedMaxRequestPayloadBytes |
| 139 | _ = ack.AgreedMaxRequestBatchItems |
| 140 | _ = ack.AgreedMaxResponsePayloadBytes |
| 141 | _ = ack.AgreedMaxResponseBatchItems |
| 142 | _ = ack.AgreedPacketSize |
| 143 | }) |
| 144 | } |
| 145 | |
| 146 | func FuzzDecodeCgroupsRequest(f *testing.F) { |
| 147 | var seed [4]byte |
| 148 | r := CgroupsRequest{LayoutVersion: 1, Flags: 0} |
| 149 | r.Encode(seed[:]) |
| 150 | f.Add(seed[:]) |
| 151 | |
| 152 | f.Add([]byte{}) |
| 153 | f.Add(make([]byte, 3)) |
| 154 | f.Add(make([]byte, 4)) |
| 155 | |
| 156 | f.Fuzz(func(t *testing.T, data []byte) { |
| 157 | req, err := DecodeCgroupsRequest(data) |
| 158 | if err != nil { |
| 159 | return |
| 160 | } |
| 161 | _ = req.LayoutVersion |
| 162 | _ = req.Flags |
| 163 | }) |
| 164 | } |
| 165 | |
| 166 | func FuzzDecodeCgroupsResponse(f *testing.F) { |
| 167 | // Seed: empty snapshot (24 bytes). |
| 168 | var emptyBuf [4096]byte |
| 169 | eb := NewCgroupsBuilder(emptyBuf[:], 0, 1, 42) |
| 170 | emptyTotal := eb.Finish() |
| 171 | f.Add(emptyBuf[:emptyTotal]) |
| 172 | |
| 173 | // Seed: single-item snapshot. |
| 174 | var singleBuf [4096]byte |
| 175 | sb := NewCgroupsBuilder(singleBuf[:], 1, 0, 100) |
| 176 | sb.Add(12345, 0x01, 1, []byte("docker-abc123"), []byte("/sys/fs/cgroup/docker/abc123")) |
| 177 | singleTotal := sb.Finish() |
| 178 | f.Add(singleBuf[:singleTotal]) |
| 179 | |
| 180 | // Seed: garbage inputs. |
| 181 | f.Add([]byte{}) |
| 182 | f.Add(make([]byte, 23)) |
| 183 | f.Add(make([]byte, 64)) |
| 184 | |
| 185 | f.Fuzz(func(t *testing.T, data []byte) { |
| 186 | view, err := DecodeCgroupsResponse(data) |
| 187 | if err != nil { |
| 188 | return |
| 189 | } |
| 190 | // Exercise all items. |
| 191 | for i := uint32(0); i < view.ItemCount; i++ { |
| 192 | item, ierr := view.Item(i) |
| 193 | if ierr != nil { |
| 194 | continue |
| 195 | } |
| 196 | _ = item.LayoutVersion |
| 197 | _ = item.Flags |
| 198 | _ = item.Hash |
| 199 | _ = item.Options |
| 200 | _ = item.Enabled |
| 201 | _ = item.Name.Bytes() |
| 202 | _ = item.Name.Len() |
| 203 | _ = item.Name.String() |
| 204 | _ = item.Path.Bytes() |
| 205 | _ = item.Path.Len() |
| 206 | _ = item.Path.String() |
| 207 | } |
| 208 | // Out-of-bounds item access should not panic. |
| 209 | _, _ = view.Item(view.ItemCount) |
| 210 | if view.ItemCount > 0 { |
| 211 | _, _ = view.Item(view.ItemCount + 1) |
| 212 | } |
| 213 | }) |
| 214 | } |
| 215 | |
| 216 | func FuzzDecodeCgroupsLookupRequest(f *testing.F) { |
| 217 | var seed [128]byte |
| 218 | n, err := EncodeCgroupsLookupRequest([][]byte{[]byte("/a"), []byte("/b/c")}, seed[:]) |
| 219 | if err == nil { |
| 220 | f.Add(seed[:n]) |
| 221 | } |
| 222 | f.Add([]byte{}) |
| 223 | f.Add(make([]byte, CgroupsLookupReqHdr-1)) |
| 224 | f.Add(make([]byte, CgroupsLookupReqHdr)) |
| 225 | |
| 226 | f.Fuzz(func(t *testing.T, data []byte) { |
| 227 | view, err := DecodeCgroupsLookupRequest(data) |
| 228 | if err != nil { |
| 229 | return |
| 230 | } |
| 231 | for i := uint32(0); i < view.ItemCount; i++ { |
| 232 | item, ierr := view.Item(i) |
| 233 | if ierr == nil { |
| 234 | _ = item.Bytes() |
| 235 | _ = item.String() |
| 236 | } |
| 237 | } |
| 238 | _, _ = view.Item(view.ItemCount) |
| 239 | }) |
| 240 | } |
| 241 | |
| 242 | func FuzzDecodeCgroupsLookupResponse(f *testing.F) { |
| 243 | var empty [128]byte |
| 244 | eb := NewCgroupsLookupBuilder(empty[:], 0, 0) |
| 245 | f.Add(empty[:eb.Finish()]) |
| 246 | |
| 247 | var seed [512]byte |
| 248 | builder := NewCgroupsLookupBuilder(seed[:], 1, 1) |
| 249 | if err := builder.Add( |
| 250 | CgroupLookupKnown, |
| 251 | OrchestratorK8s, |
| 252 | []byte("/a"), |
| 253 | []byte("pod-a"), |
| 254 | []struct{ Key, Value []byte }{{Key: []byte("namespace"), Value: []byte("default")}}, |
| 255 | ); err == nil { |
| 256 | f.Add(seed[:builder.Finish()]) |
| 257 | } |
| 258 | f.Add([]byte{}) |
| 259 | f.Add(make([]byte, CgroupsLookupRespHdr-1)) |
| 260 | f.Add(make([]byte, CgroupsLookupRespHdr)) |
| 261 | |
| 262 | f.Fuzz(func(t *testing.T, data []byte) { |
| 263 | view, err := DecodeCgroupsLookupResponse(data) |
| 264 | if err != nil { |
| 265 | return |
| 266 | } |
| 267 | for i := uint32(0); i < view.ItemCount; i++ { |
| 268 | item, ierr := view.Item(i) |
| 269 | if ierr != nil { |
| 270 | continue |
| 271 | } |
| 272 | _ = item.Path.Bytes() |
| 273 | _ = item.Name.String() |
| 274 | for j := uint32(0); j < uint32(item.LabelCount); j++ { |
| 275 | label, lerr := item.Label(j) |
| 276 | if lerr == nil { |
| 277 | _ = label.Key.String() |
| 278 | _ = label.Value.String() |
| 279 | } |
| 280 | } |
| 281 | } |
| 282 | _, _ = view.Item(view.ItemCount) |
| 283 | }) |
| 284 | } |
| 285 | |
| 286 | func FuzzDecodeAppsLookupRequest(f *testing.F) { |
| 287 | var seed [128]byte |
| 288 | n, err := EncodeAppsLookupRequest([]uint32{0, 1234}, seed[:]) |
| 289 | if err == nil { |
| 290 | f.Add(seed[:n]) |
| 291 | } |
| 292 | f.Add([]byte{}) |
| 293 | f.Add(make([]byte, AppsLookupReqHdr-1)) |
| 294 | f.Add(make([]byte, AppsLookupReqHdr)) |
| 295 | |
| 296 | f.Fuzz(func(t *testing.T, data []byte) { |
| 297 | view, err := DecodeAppsLookupRequest(data) |
| 298 | if err != nil { |
| 299 | return |
| 300 | } |
| 301 | for i := uint32(0); i < view.ItemCount; i++ { |
| 302 | pid, ierr := view.Item(i) |
| 303 | if ierr == nil { |
| 304 | _ = pid |
| 305 | } |
| 306 | } |
| 307 | _, _ = view.Item(view.ItemCount) |
| 308 | }) |
| 309 | } |
| 310 | |
| 311 | func FuzzDecodeAppsLookupResponse(f *testing.F) { |
| 312 | var empty [128]byte |
| 313 | eb := NewAppsLookupBuilder(empty[:], 0, 0) |
| 314 | f.Add(empty[:eb.Finish()]) |
| 315 | |
| 316 | var seed [1024]byte |
| 317 | builder := NewAppsLookupBuilder(seed[:], 1, 1) |
| 318 | if err := builder.Add( |
| 319 | PidLookupKnown, |
| 320 | AppsCgroupKnown, |
| 321 | OrchestratorDocker, |
| 322 | 1234, |
| 323 | 1, |
| 324 | 1000, |
| 325 | 42, |
| 326 | []byte("nginx"), |
| 327 | []byte("/docker/abc"), |
| 328 | []byte("container-a"), |
| 329 | []struct{ Key, Value []byte }{{Key: []byte("image"), Value: []byte("nginx:latest")}}, |
| 330 | ); err == nil { |
| 331 | f.Add(seed[:builder.Finish()]) |
| 332 | } |
| 333 | f.Add([]byte{}) |
| 334 | f.Add(make([]byte, AppsLookupRespHdr-1)) |
| 335 | f.Add(make([]byte, AppsLookupRespHdr)) |
| 336 | |
| 337 | f.Fuzz(func(t *testing.T, data []byte) { |
| 338 | view, err := DecodeAppsLookupResponse(data) |
| 339 | if err != nil { |
| 340 | return |
| 341 | } |
| 342 | for i := uint32(0); i < view.ItemCount; i++ { |
| 343 | item, ierr := view.Item(i) |
| 344 | if ierr != nil { |
| 345 | continue |
| 346 | } |
| 347 | _ = item.Comm.String() |
| 348 | _ = item.CgroupPath.Bytes() |
| 349 | _ = item.CgroupName.String() |
| 350 | for j := uint32(0); j < uint32(item.LabelCount); j++ { |
| 351 | label, lerr := item.Label(j) |
| 352 | if lerr == nil { |
| 353 | _ = label.Key.String() |
| 354 | _ = label.Value.String() |
| 355 | } |
| 356 | } |
| 357 | } |
| 358 | _, _ = view.Item(view.ItemCount) |
| 359 | }) |
| 360 | } |
| 361 | |
| 362 | func FuzzBatchDirDecode(f *testing.F) { |
| 363 | // Seed: valid 2-entry directory. |
| 364 | var seed [16]byte |
| 365 | ne.PutUint32(seed[0:4], 0) // offset=0, aligned |
| 366 | ne.PutUint32(seed[4:8], 10) // length=10 |
| 367 | ne.PutUint32(seed[8:12], 16) // offset=16, aligned |
| 368 | ne.PutUint32(seed[12:16], 5) // length=5 |
| 369 | f.Add(seed[:], uint32(2), uint32(100)) |
| 370 | |
| 371 | // Seed: empty. |
| 372 | f.Add([]byte{}, uint32(0), uint32(0)) |
| 373 | f.Add(make([]byte, 8), uint32(1), uint32(50)) |
| 374 | f.Add(make([]byte, 4), uint32(1), uint32(50)) // truncated |
| 375 | |
| 376 | f.Fuzz(func(t *testing.T, data []byte, itemCount uint32, packedAreaLen uint32) { |
| 377 | // Clamp item_count to prevent huge allocations that slow the fuzzer. |
| 378 | if itemCount > 1024 { |
| 379 | return |
| 380 | } |
| 381 | entries, err := BatchDirDecode(data, itemCount, packedAreaLen) |
| 382 | if err != nil { |
| 383 | return |
| 384 | } |
| 385 | for _, e := range entries { |
| 386 | _ = e.Offset |
| 387 | _ = e.Length |
| 388 | } |
| 389 | }) |
| 390 | } |
| 391 | |
| 392 | func FuzzBatchItemGet(f *testing.F) { |
| 393 | // Seed: valid single-item batch payload built via BatchBuilder. |
| 394 | var batchBuf [256]byte |
| 395 | bb := NewBatchBuilder(batchBuf[:], 2) |
| 396 | bb.Add([]byte{1, 2, 3, 4, 5}) |
| 397 | bb.Add([]byte{10, 20, 30}) |
| 398 | total, count := bb.Finish() |
| 399 | f.Add(batchBuf[:total], count, uint32(0)) |
| 400 | f.Add(batchBuf[:total], count, uint32(1)) |
| 401 | |
| 402 | f.Add([]byte{}, uint32(0), uint32(0)) |
| 403 | f.Add(make([]byte, 8), uint32(1), uint32(0)) |
| 404 | |
| 405 | f.Fuzz(func(t *testing.T, payload []byte, itemCount uint32, index uint32) { |
| 406 | // Clamp to prevent huge allocations from itemCount. |
| 407 | if itemCount > 1024 { |
| 408 | return |
| 409 | } |
| 410 | item, err := BatchItemGet(payload, itemCount, index) |
| 411 | if err != nil { |
| 412 | return |
| 413 | } |
| 414 | _ = len(item) |
| 415 | if len(item) > 0 { |
| 416 | _ = item[0] |
| 417 | } |
| 418 | }) |
| 419 | } |