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Fix GNU sparse 1.0 maps spanning multiple TAR records - #135626
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Check refill capacity after excluding consumed bytes so valid GNU sparse 1.0 maps can span multiple TAR records. Preserve the existing buffer and segment-count limits, and cover boundary-sized maps, extraction, archive advancement, and malformed inputs. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 9b3e8fbb-f56a-48da-9df9-8c67a81584d0
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Tagging subscribers to this area: @dotnet/area-system-formats-tar |
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/ba-g Mutex test failures are unrelated |
rzikm
enabled auto-merge (squash)
October 19, 2026 11:17
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/backport to release/11.0 |
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Started backporting to |
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Valid GNU sparse 1.0 PAX entries can throw
InvalidDataExceptionwhen their embedded sparse map exceeds approximately 1 KiB. The refill-capacity check includes already-consumed bytes that the next refill would discard during compaction.Calculate capacity using only unread bytes. This preserves the fixed 1 KiB buffer, the 1,000,000-segment allocation limit, numeric-line bounds, and record-aligned packed-data positioning.
Regression coverage checks exact record boundaries, the reported 1,006-byte and 1,062-byte map sizes, and an 8,193-byte map. It covers sync/async reads and extraction, copied/non-copied data, non-seekable inputs, next-entry alignment, and malformed maps.
Validation
Commands ran through a short
substpath on Windows x64:.\build.cmd clr+libs -rc Release- passed..\dotnet.cmd build src\libraries\System.Formats.Tar\src\System.Formats.Tar.csproj- passed for the Windows and Unix target assemblies..\dotnet.cmd build /t:test src\libraries\System.Formats.Tar\tests\System.Formats.Tar.Tests.csproj '/p:XUnitOptions=-class System.Formats.Tar.Tests.TarReader_SparseFileTests'- 159 cases executed; 32 valid-map cases failed before the fix, and all 159 passed afterward..\dotnet.cmd build /t:test src\libraries\System.Formats.Tar\tests\System.Formats.Tar.Tests.csproj- all 7,084 standard tests passed, with zero skips.Both original issue archives passed sync/async reading and directory extraction after the fix, with expanded lengths and SHA-256 hashes matching Python
tarfile. Non-Windows test execution and the multi-gigabyte manual stress project were not run.Fixes: #134980
Resolves #134980
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This description was generated by GitHub Copilot.