Undo incorrect arithmetic decoder change + follow-up Reverts https://pdfium-review.googlesource.com/c/pdfium/+/52712 Reverts https://pdfium-review.googlesource.com/c/pdfium/+/16791 The last of those two is incorrect per JBIG2 spec, the first papers over an issue caused by it. The last change even cites the spec part that says that an arithmetic decoder should keep returning 1-bits on out-of-data. This is also described in detail in Annex E. This includes two tests, one of which has several trailing 7fff byte pairs stripped before the final ffac pair. pdf.js, Preview.app, Acrobat Reader all decode these files fine. The construction of these tests is described in detail in: * https://github.com/SerenityOS/serenity/pull/26272/commits/ba49ffac4dd * https://github.com/SerenityOS/serenity/pull/26242/commits/9882a8462b6 I took these two files, converted them to PDF using Meta/jbig2_to_pdf.py in that repo, and then to .in format using the script in https://pdfium-review.googlesource.com/c/pdfium/+/136590 This also fixes decoding 042_25.jb2 from the Power JBIG2 test set. clusterfuzz-testcase-pdf_codec_jbig2_fuzzer-5210024078213120 from the third linked bug is a 5636 x 60419 image and needs ~35s to run on my machine. To not re-introduce the timeouts fixed by the incorrect fix, instead limit regions to 4096 x 4096 while fuzzing. This makes `pdf_codec_jbig2_fuzzer` process that test case in 0 ms instead of in 35s on my machine as it now early-outs. I confirmed that bug_947622_min.pdf from comment 7 on bug 41450095 renders exactly the same before and after this change. Bug: 432920906,41450095,40540933 Change-Id: Idc5c13c9440d0b4749f0832659bcdf36c1bc3597 Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/136630 Reviewed-by: Nico Weber <thakis@google.com> Commit-Queue: Nico Weber <thakis@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/core/fpdfapi/page/cpdf_dib.cpp b/core/fpdfapi/page/cpdf_dib.cpp index dbc9a8e..deb6426 100644 --- a/core/fpdfapi/page/cpdf_dib.cpp +++ b/core/fpdfapi/page/cpdf_dib.cpp
@@ -269,11 +269,12 @@ pGlobalSpan = global_acc_->GetSpan(); nGlobalKey = global_acc_->KeyForCache(); } + const bool reject_large_regions_when_fuzzing = false; iDecodeStatus = Jbig2Decoder::StartDecode( jbig_2context_.get(), document_->GetOrCreateCodecContext(), GetWidth(), GetHeight(), pSrcSpan, nSrcKey, pGlobalSpan, nGlobalKey, - cached_bitmap_->GetWritableBuffer(), cached_bitmap_->GetPitch(), - pPause); + cached_bitmap_->GetWritableBuffer(), cached_bitmap_->GetPitch(), pPause, + reject_large_regions_when_fuzzing); } else { iDecodeStatus = Jbig2Decoder::ContinueDecode(jbig_2context_.get(), pPause); }
diff --git a/core/fxcodec/jbig2/JBig2_ArithDecoder.cpp b/core/fxcodec/jbig2/JBig2_ArithDecoder.cpp index b25b557..1c4a0d2 100644 --- a/core/fxcodec/jbig2/JBig2_ArithDecoder.cpp +++ b/core/fxcodec/jbig2/JBig2_ArithDecoder.cpp
@@ -94,22 +94,6 @@ unsigned char B1 = stream_->getNextByte_arith(); if (B1 > 0x8f) { ct_ = 8; - - switch (state_) { - case StreamState::kDataAvailable: - // Finished decoding data (see JBIG2 spec, Section E.3.4). - state_ = StreamState::kDecodingFinished; - break; - case StreamState::kDecodingFinished: - // Allow one more call in the finished state. https://crbug.com/947622 - state_ = StreamState::kLooping; - break; - case StreamState::kLooping: - // Looping state detected. Mark decoding as complete to bail out. - // https://crbug.com/767156 - complete_ = true; - break; - } } else { stream_->incByteIdx(); b_ = B1;
diff --git a/core/fxcodec/jbig2/JBig2_ArithDecoder.h b/core/fxcodec/jbig2/JBig2_ArithDecoder.h index 4d3ff12..a103508 100644 --- a/core/fxcodec/jbig2/JBig2_ArithDecoder.h +++ b/core/fxcodec/jbig2/JBig2_ArithDecoder.h
@@ -48,17 +48,10 @@ bool IsComplete() const { return complete_; } private: - enum class StreamState : uint8_t { - kDataAvailable, - kDecodingFinished, - kLooping, - }; - void BYTEIN(); void ReadValueA(); bool complete_ = false; - StreamState state_ = StreamState::kDataAvailable; uint8_t b_; unsigned int c_; unsigned int a_;
diff --git a/core/fxcodec/jbig2/JBig2_Context.cpp b/core/fxcodec/jbig2/JBig2_Context.cpp index 827386d..2d62067 100644 --- a/core/fxcodec/jbig2/JBig2_Context.cpp +++ b/core/fxcodec/jbig2/JBig2_Context.cpp
@@ -1192,6 +1192,12 @@ stream_->read1Byte(&pRI->flags) != 0) { return JBig2_Result::kFailure; } + + if (reject_large_regions_when_fuzzing_ && + (pRI->width > 4096 || pRI->height > 4096)) { + return JBig2_Result::kFailure; + } + return JBig2_Result::kSuccess; }
diff --git a/core/fxcodec/jbig2/JBig2_Context.h b/core/fxcodec/jbig2/JBig2_Context.h index b7521e5..fb967f2 100644 --- a/core/fxcodec/jbig2/JBig2_Context.h +++ b/core/fxcodec/jbig2/JBig2_Context.h
@@ -52,6 +52,10 @@ bool Continue(PauseIndicatorIface* pPause); FXCODEC_STATUS GetProcessingStatus() const { return processing_status_; } + void RejectLargeRegionsWhenFuzzing() { + reject_large_regions_when_fuzzing_ = true; + } + private: CJBig2_Context(pdfium::span<const uint8_t> pSrcSpan, uint64_t src_key, @@ -102,6 +106,7 @@ uint32_t offset_ = 0; JBig2RegionInfo ri_ = {}; UnownedPtr<std::list<CJBig2_CachePair>> const symbol_dict_cache_; + bool reject_large_regions_when_fuzzing_ = false; }; #endif // CORE_FXCODEC_JBIG2_JBIG2_CONTEXT_H_
diff --git a/core/fxcodec/jbig2/jbig2_decoder.cpp b/core/fxcodec/jbig2/jbig2_decoder.cpp index d195525..f64f065 100644 --- a/core/fxcodec/jbig2/jbig2_decoder.cpp +++ b/core/fxcodec/jbig2/jbig2_decoder.cpp
@@ -53,7 +53,8 @@ uint64_t global_key, pdfium::span<uint8_t> dest_buf, uint32_t dest_pitch, - PauseIndicatorIface* pPause) { + PauseIndicatorIface* pPause, + bool reject_large_regions_when_fuzzing) { pJbig2Context->width_ = width; pJbig2Context->height_ = height; pJbig2Context->src_span_ = src_span; @@ -66,6 +67,11 @@ pJbig2Context->context_ = CJBig2_Context::Create(global_span, global_key, src_span, src_key, pJBig2DocumentContext->GetSymbolDictCache()); + + if (reject_large_regions_when_fuzzing) { + pJbig2Context->context_->RejectLargeRegionsWhenFuzzing(); + } + bool succeeded = pJbig2Context->context_->GetFirstPage( dest_buf, width, height, dest_pitch, pPause); return Decode(pJbig2Context, succeeded);
diff --git a/core/fxcodec/jbig2/jbig2_decoder.h b/core/fxcodec/jbig2/jbig2_decoder.h index d068842..96e3685 100644 --- a/core/fxcodec/jbig2/jbig2_decoder.h +++ b/core/fxcodec/jbig2/jbig2_decoder.h
@@ -50,7 +50,8 @@ uint64_t global_key, pdfium::span<uint8_t> dest_buf, uint32_t dest_pitch, - PauseIndicatorIface* pPause); + PauseIndicatorIface* pPause, + bool reject_large_regions_when_fuzzing); static FXCODEC_STATUS ContinueDecode(Jbig2Context* pJbig2Context, PauseIndicatorIface* pPause);
diff --git a/testing/fuzzers/pdf_codec_jbig2_fuzzer.cc b/testing/fuzzers/pdf_codec_jbig2_fuzzer.cc index e28d630..91a4eac 100644 --- a/testing/fuzzers/pdf_codec_jbig2_fuzzer.cc +++ b/testing/fuzzers/pdf_codec_jbig2_fuzzer.cc
@@ -42,9 +42,12 @@ JBig2_DocumentContext document_context; Jbig2Context jbig2_context; + + const bool reject_large_regions_when_fuzzing = true; FXCODEC_STATUS status = Jbig2Decoder::StartDecode( &jbig2_context, &document_context, width, height, span, 1, {}, 0, - bitmap->GetWritableBuffer(), bitmap->GetPitch(), nullptr); + bitmap->GetWritableBuffer(), bitmap->GetPitch(), nullptr, + reject_large_regions_when_fuzzing); while (status == FXCODEC_STATUS::kDecodeToBeContinued) { status = Jbig2Decoder::ContinueDecode(&jbig2_context, nullptr);
diff --git a/testing/resources/pixel/jbig2-trailing-7fff-stripped-harder-refine.in b/testing/resources/pixel/jbig2-trailing-7fff-stripped-harder-refine.in new file mode 100644 index 0000000..cb2d1ba --- /dev/null +++ b/testing/resources/pixel/jbig2-trailing-7fff-stripped-harder-refine.in
@@ -0,0 +1,91 @@ +{{header}} + +{{object 1 0}} << + /Type /Catalog + /Pages 2 0 R +>> +endobj + +{{object 2 0}} << + /Type /Pages + /Kids [ 3 0 R ] + /Count 1 +>> +endobj + +{{object 3 0}} << + /Type /Page + /Parent 2 0 R + /MediaBox [ 0 0 399 400 ] + /Contents 4 0 R + /Resources << + /XObject << + /Im 5 0 R + >> + >> +>> +endobj + +{{object 4 0}} << + {{streamlen}} +>> +stream +399 0 0 400 0 0 cm +/Im Do +endstream +endobj + +{{object 5 0}} << + {{streamlen}} + /Type /XObject + /Subtype /Image + /Width 399 + /Height 400 + /ColorSpace /DeviceGray + /Filter [ /ASCIIHexDecode /JBIG2Decode ] + /BitsPerComponent 1 +>> +stream +00000000300001000000130000018f0000019000000000000000001000000000 +00012700010000001c0000018f000001900000000000000000020003fffdff02 +fefefeffac000000022401010000001c0000018f000001900000000000000000 +020003fffdff02fefefeffac000000032a200201000004040000018f00000190 +00000000000000000200fffffffffd1bf1ff73d66fda2e249b8aff7fff7eab49 +0046e2d27531edc993aba10778ff7fff7e91ea01ab03a991e82dd0544da88fcb +4f0b874959b9f0851daab39a106030934e932ff8325f47ea96e7238edf169788 +ab49a67bd54d8ff7f9f1779fd559206a31fbc0c9c737faaa38fe1b5c903dff76 +33e2ee34302c9af81cacbd7cd0bb7efe0c5e67da5c01b53ff7e0efff3a788743 +ff7fff1570ff7df26b4ef68f6822f28c17ff7fff7fff7fff7fff7f635b05ff7f +ff7fff7fff7fff7fff7fff7fff7fff7fff7f32a3ff7fff7fff7fff7fff7fff7f +ff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7f +ff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7f +ff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7f +ff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7f +ff7fff7fea058c0a7959dc7da161ee41bb0c202ce6090b989d794c12e5cca042 +42546d33e998a82d4247f8a7a2078457325c33cdd49f5c6e1853dbc0af70f568 +d3b522e3708d40dbd39b451d78a0e3d31a8392dcdce09a677f5b3380fbab0144 +a8486f66dca8e0c290442cefd115696b398ae5185379cffcd42ac6a508d40ed5 +6cc2cd2cfd51a81fbf035cf84c24a3fcd6f5af2eb7055a02575ba43733b5f820 +3ce9a419c78d127f15bae1649f83da072f1bfe369a549191843d570fd258e3de +1b222b9955296c34651dc5cf459e2d724547223fc779cd26129226673c145760 +bbadcc6dd6174b4aa1652a76b9438f53b89800e29bb284527ee8cec60e7e9cf3 +65bdcb3e68cdf7ac5168d3c33b0ce43a68a7489785f43125fe8738df7966623f +f5ff8170dcff4f68e799eb5fca3cf42f0f81ea3423b04678ecb818039594411e +85ecd7cd406098a16d542c6257463a865616cbb33419bd11301f869ac01006a9 +2271822e0a04ebe7ec765a7aab606bd3f3a0465d3b2b5ce8505c3b3e5d4b6cda +a1a89ca6d9129c291c37bdc409afd11f4733e9796bcb9fbde76f5d7164ab2483 +f63a399836c1df484d9011d4fd4ac95902e1f8c41ca7fa1b2703df42569a8e34 +769c6cd533b4c110d4b7ea753828792ec59a774f534b20e7ded40588cae6185b +5f2f0021016600fe1984fa02dd8a19e49488537449275b2214b77964df6d7ab2 +5e4449df9fbc5e8eceacb9f1f21435edbdb78f41f2b7c5dde561f30df69bbb8c +14aa26009735f2fe5576e292b41b5e5c2a1ffd102994f7e0deb5961e61f194b8 +89ea0b440efe4504009d4028e83a0b330b166ca6802640679e1c71bdf4a0751b +458b6813e28c66f72390a01b1c8be955a5b4bb582a0d419a2c857b40cc46cded +2caf66eab028a0841fe8e4d3b5139de022cd47d41d67bc8f8685ffac> +endstream +endobj + +{{xref}} +{{trailer}} +{{startxref}} +%%EOF
diff --git a/testing/resources/pixel/jbig2-trailing-7fff-stripped-harder-refine_expected.pdf.0.png b/testing/resources/pixel/jbig2-trailing-7fff-stripped-harder-refine_expected.pdf.0.png new file mode 100644 index 0000000..02f6c0d --- /dev/null +++ b/testing/resources/pixel/jbig2-trailing-7fff-stripped-harder-refine_expected.pdf.0.png Binary files differ
diff --git a/testing/resources/pixel/jbig2-trailing-7fff-stripped-harder.in b/testing/resources/pixel/jbig2-trailing-7fff-stripped-harder.in new file mode 100644 index 0000000..c5668ae --- /dev/null +++ b/testing/resources/pixel/jbig2-trailing-7fff-stripped-harder.in
@@ -0,0 +1,507 @@ +{{header}} + +{{object 1 0}} << + /Type /Catalog + /Pages 2 0 R +>> +endobj + +{{object 2 0}} << + /Type /Pages + /Kids [ 3 0 R ] + /Count 1 +>> +endobj + +{{object 3 0}} << + /Type /Page + /Parent 2 0 R + /MediaBox [ 0 0 399 400 ] + /Contents 4 0 R + /Resources << + /XObject << + /Im 5 0 R + >> + >> +>> +endobj + +{{object 4 0}} << + {{streamlen}} +>> +stream +399 0 0 400 0 0 cm +/Im Do +endstream +endobj + +{{object 5 0}} << + {{streamlen}} + /Type /XObject + /Subtype /Image + /Width 399 + /Height 400 + /ColorSpace /DeviceGray + /Filter [ /ASCIIHexDecode /JBIG2Decode ] + /BitsPerComponent 1 +>> +stream +00000000300001000000130000018f0000019000000000000000001000000000 +00012700010000001c0000018f000001900000000000000000020003fffdff02 +fefefeffac00000002270001000038180000018f000001900000000000000000 +020003fffdff02fefefeff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7f +ff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7f 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