[robobun]

Problem

• For a damaged tar, files() and extract(dir, {glob}) resolve with a partial result. extract(dir) skips a bad header checksum and can write entries the archive does not have.
• Three loops in src/runtime/api/Archive.rs ran while archive.read_next_header(&mut entry).succeeded(). Retry, Failed and Fatal ended the loop like Eof.

Fix

• lib::MemoryReader (src/libarchive/lib.rs) decodes every header status of a tar in memory. Each opener names DamagedBlock::Skip or Fail for a bad checksum.
• Bun.Archive names Fail, so files() and every extract() form reject. bun install, create, publish and pm diff name Skip and do not change.
• Verified: test/js/bun/archive.test.ts (12 new tests fail on main) and 152 probe cells (116 now reject, 0 change value).
• Self-reviewed: 4 concerns raised, 2 addressed (1 in part). The reader type and the first Downside need a maintainer's answer (Notes).

Background

• For a tar in memory, libarchive's RETRY means that it dropped a header block with a bad checksum.
• In the non-blocking TarballStream.rs, RETRY also means "no bytes yet", so that code keeps its own decode.
• Weighed: reject in Archive.rs only (extract(dir) still skips), or fail every caller (breaks two install tests). The reader cuts decode sites from 8 to 2.

Downsides

• Bun.Archive now rejects a complete tar followed by non-zero 512-byte blocks. Main and most tar readers accept it.
• bun install gains 2 instructions per tar entry (4,868 to 4,870). Release .text grows by 256 bytes.

Notes

Two questions for a maintainer.

1. The reader type. REVIEW.md asks for agreement before a PR adds a cross-cutting abstraction. Is one reader for a tar in memory, with DamagedBlock named at each opener, agreed for this PR? It replaces two readers that exist today (BufferReadStream and the handle inside ArchiveIterator). If the answer is no, the same behavior fits in a smaller change, which the design review sized at about 250 changed lines in 3 files: reject arms in the three Archive.rs loops, and one flag on ExtractOptions that only Bun.Archive sets. The other loops then keep their own Retry arms.
2. Data after the end of the archive. Should Bun.Archive reject a complete tar that has non-zero bytes after its end-of-archive marker? This PR rejects it, and one test pins that. Main accepts it in every entry point, and bun install accepts it. GNU tar 1.35 accepts it by default and exits 2 with --ignore-zeros, which is the mode that Bun uses (read_concatenated_archives). node-tar 6.2.1 and Python tarfile accept it. The reader cannot tell the two cases apart from outside libarchive. In that mode libarchive consumes the zero blocks and the next block in one call, and returns the same RETRY as for a damaged header. The stream positions do not help: a pax global header before a damaged block gives the same positions and the same RETRY. To accept the trailing bytes needs a patch to the tar reader of libarchive (a block that is not a header, after an end-of-archive marker, ends the read), in a PR of its own. If the answer is "accept", I remove that one test row and write the patch.

The policy at each opener.

opener	policy	change
Bun.Archive: files(), files(glob), extract(dir), extract(dir, {glob}), the files: count of console.log	Fail	rejects at a bad checksum (the count stops there)
the buffered extractor of bun install (extract_tarball.rs, two openers)	Skip	none
bun create (create_command.rs, two openers)	Skip	none
the --compile download (StandaloneModuleGraph.rs)	Skip	none
bun publish <tarball>, bun pm diff (ArchiveIterator)	Skip	none
readTarball in bun:internal-for-testing	Skip	none

Not changed: TarballStream::step (the streaming extractor of bun install) keeps its own Retry arms. The files: count of console.log(archive) has no error channel: the caller in src/runtime/jsc_hooks.rs discards the result, so the count stops at the failed read and prints the partial number, as on main.

Measurements. Release builds of the merge base (3b7ee8e83) and of this branch (f62aec355), Linux x64.

• Bun.Archive outcomes, main vs PR (19 inputs x 8 call forms): 116 cells resolve -> reject, 0 reject -> resolve, 0 changed success values. PHANTOM entries on disk after extract(dir): 3 -> 0. Async cells that resolve after a failed header read: 13/18 -> 0/18. 5 rejecting inputs were listed completely on main (all have data after the last entry).
• Instructions per header, valid tar (gdb stepi, 6 consecutive headers, same input): inspect loop 3,868 -> 3,868. extract_to_dir (buffered bun install of a 1,001-file file: tarball) 4,868 -> 4,870. Status decode in the inspect loop 4 -> 3 instructions. Out-of-line next_entry copies: 0.
• Release .text: 80,676,876 bytes (main 80,676,620, delta +256). extract_to_dir 6,832 -> 6,650 B. get_overwriting_file_list 2,347 -> 1,993 B. count_files_in_archive 392 -> 277 B.
• Header-status decode sites: 8 on main -> 2 (MemoryReader::next_entry, TarballStream::step). read_open_memory call sites outside bun_libarchive: 4 -> 0. A scratch archive.next_entry() in TarballStream::step: cargo check fails with E0599 (line removed).
• CLI readers under Skip: 12 of 12 outputs byte-identical to main (stdout, stderr, exit code, installed tree) for bun pm diff, bun publish --dry-run and bun install of file: tarballs, with clean and damaged inputs. test/cli lines changed: 0. Unmodified install, pack, publish, pm-diff and create test files that pass: 5 of 5.
• size_of::<ExtractOptions>(): 16 -> 16 bytes.
• Header calls before extract(dir) settles: a damaged 1 MiB entry 2,052 -> 2, bad-checksum.tar 5 -> 2, nested-bad-checksum.tar 7 -> 2. A valid tar: 3 -> 3.
• Diff vs main: refactor commit +232/-388 in 8 files (every opener on Skip, no outcome change), policy commit +4/-4 source lines and +81/-16 test lines. Whole PR: source +259/-402 in 8 files, tests +219/-2.

Tools: perf, valgrind, strace and bloaty are not installed here, so the counts come from gdb, objdump, nm and size.

The 19 probe inputs. Each has a complete a.txt first unless the name says otherwise. Columns: files(), then extract(dir) and the tree it leaves.

input	main	this PR
clean tar, two concatenated tars	all entries	same
tar that ends inside a header	[a.txt], extract rejects	both reject
complete tar, then 100 bytes	all entries, extract rejects	both reject
bad checksum after a pax header	[a.txt], extract rejects	both reject
bad checksum on b.txt, then c.txt (also as tar.gz)	[a.txt], extract writes a.txt, c.txt	both reject, a.txt on disk
bad checksum on the last entry	[a.txt], extract resolves with 1	both reject
bad checksum on two entries in a row	[a.txt], extract writes a.txt, d.txt	both reject
bad checksum on a 1 MiB entry	[a.txt], extract resolves with 2	both reject
bad checksum on an entry that holds a tar	[a.txt], extract writes 5 entries, 3 of them not in the archive	both reject, a.txt on disk
one block that is not a header between two entries	[a.txt], extract resolves with 2	both reject
second of two concatenated tars starts with a bad checksum	[a.txt], extract resolves with 2	both reject
pax global header, junk block, pax global header, two files	[], extract resolves with 2	both reject, nothing on disk
complete tar, then 512 or 1,536 non-zero bytes (also as tar.gz, also with no end marker)	all entries	both reject, all entries on disk
bad checksum on the first entry	both reject (libarchive cannot open it)	same

Behavior changes to know.

• Data after the last entry: Bun sets read_concatenated_archives, so libarchive reads past the end-of-archive marker. Non-zero bytes there are the same RETRY as a damaged header (whole blocks) or a FATAL (a partial block). Both reject now. Zero padding and bytes after the gzip stream of a tar.gz still resolve. To tell trailing data from a damaged header needs a libarchive patch, or Bun.Archive without read_concatenated_archives (then it reads only the first of two concatenated archives). This is question 2 above.
• A rejected extract(dir) leaves the entries it wrote before the damage, and does not create the symlinks it deferred. A FATAL does the same on main.
• The files() rejection carries libarchive's message, for example Damaged tar archive (bad header checksum). extract() keeps ReadError.
• Valid archives do not change: 22 archives give identical results and identical extracted trees on both builds in all 8 call forms. They come from GNU tar 1.35 (ustar, gnu, pax, a pax global header, real --sparse entries in both formats, blocking factor 64, zero padding, gzip, gzip with trailing bytes), two concatenated tars, two concatenated gzip members, bun pm pack, Bun.Archive itself, and the six fixture tars of the test suite.

Removed messages. Two became unreachable, because the reader frees the handle when it drops: failed to free archive read in ArchiveIterator::close, and the second failed to close read archive in readTarball. Every other message is byte-identical. IteratorResult::Err now carries a copy of libarchive's text and no raw handle. With an owning reader, a raw handle in the error would be a use after free.

Other PRs. #39724 proposes that a bad checksum fails in bun install too. On top of this PR that is a change of the named Skip tokens plus its check in TarballStream. #37678 makes BufferReadStream own its handle and borrow its bytes: MemoryReader includes that. #41503 adds a gzip trailer check that returns FATAL: with this PR Bun.Archive rejects when that error lands in a header read. The per-caller policy ("install and create keep the skip, Bun.Archive does not") comes from commit 6f541fac5e on the unpublished branch robobun/065f3bea/archive-read-path.

Left out. This PR reports what libarchive reports. It does not make libarchive find more damage: a tar.gz with one flipped bit in the data of an entry still resolves with the changed bytes, because libarchive does not check the gzip trailer (#41503 adds that check). In extract() with a glob, a failed openat or write of an output file still skips that entry. extract(dir) rejects on a failed write. That is an output error, not a read error. With bun 1.4.3, when b.txt is an existing directory in the destination, extract() with a glob resolves with 2 of 3 entries. docs/runtime/archive.mdx promises a throw for an output error. No open PR changes it. After a failed data read, extract(dir) leaves the partial file of that entry on disk (1,000 of 4,096 bytes for the input of the test), and extract() with a glob removes it. Both do the same on main. For a 2 MiB entry on Linux, the file that stays has the full size and a zero tail, because the extractor allocates the file first. Both cases belong to the code that writes an entry. The draft #36542 replaces the two write loops with one writer. For an old GNU sparse entry whose map is out of order, files() and extract() with a glob reject, and extract(dir) resolves, because it writes each block at its offset. A test pins all three. bun publish <tarball> and bun pm diff still skip a damaged block, so they can list an entry that is not in the tarball. One named token changes each, in a PR of its own with a test.

Self-review. A review of this diff raised the four concerns below. Part of its output was lost before I read it, so this list can be incomplete.

• Data after the end-of-archive marker must not be rejected without a maintainer's decision. It is question 2 above.
• The reader is a cross-cutting type that no maintainer has agreed to. It is question 1 above.
• The handling of a failed data read is uneven, and three tests left out extract(dir). Addressed in part: those tests now cover extract(dir). The two extractors behind extract() still differ, as "Left out" says.
• Packaging: a dead Archive::read_free, a title that said "damaged archives", and conflicts with open PRs. Addressed: the method is removed, the title now names header reads, and the conflicts are listed below.

The review also found that one reason in the design rationale is wrong. It said that no reference tar reader drops a damaged block without an error. node-tar 6.2.1 emits a warn event, skips the block and resolves. It rejects only with strict: true. This body does not use that reason.

Open PRs that touch the same lines (checked with git merge-tree). These merge into main today and conflict with this branch: #41503 (extract_tarball.rs), #41750 and #43144 (lib.rs, Archive.rs, archive.test.ts), #31979 (lib.rs, pack_command.rs), #42400 (pm_diff_command.rs). So does the draft #36542 (lib.rs, Archive.rs, archive.test.ts): it replaces the write loop of extract() with a glob, which holds the failed-read arm of this PR. These conflict with main already, and with this branch too: #37678, #39724, #31585. This branch merges into main (bc7a813b10) with no conflict.

History of this PR. The first version made files() and extract() with a glob skip a damaged block, as extract(dir) did. Three reviews objected, and I measured that the skip adds entries that are not in the archive. I had written this fix without a design review. That review then picked the shape above. Earlier notes of mine were wrong in two places, and both are corrected here: the six files in test/js/bun/fixtures/sparse-tars are not sparse entries, and a check of files() cannot see a symlink or a directory, because it lists regular files only.

Tests run. Debug build: test/js/bun/archive.test.ts (120 pass, 1 skip; on main 12 of them fail), bun-install-streaming-extract.test.ts (25 pass), bun-create.test.ts (21 pass). Release build of this branch: bun-pm-diff.test.ts (47 pass), bun-pack.test.ts (86 pass), bun-publish.test.ts (46 pass), bun-create.test.ts (21 pass), bun-install-streaming-extract.test.ts (25 pass). On the debug build, on this loaded host, two pm-diff tests and one pack test exceed the 5 s limit, and the publish file times out in a setup hook. The two pm-diff tests time out without this change too. I did not run that control for pack and publish. All of these files pass on the release build of this branch. bun run rust:check-all: 12 targets ok.

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no test proof · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/bun/archive.test.ts

[robobun]

Status: ready for review. Head fc4f010336.

Two questions for a maintainer. The details are at the top of the Notes in the PR body.

1. The reader type. lib::MemoryReader is a cross-cutting type in a fix PR, and REVIEW.md asks for agreement on that. If the answer is no, the same behavior fits in a smaller change in 3 files.
2. Data after the end of the archive. This PR makes Bun.Archive reject a complete tar that has non-zero 512-byte blocks after its end-of-archive marker. Main accepts it. GNU tar 1.35 (default mode), node-tar 6.2.1 and Python tarfile accept it. To accept it needs a patch to the tar reader of libarchive. If the answer is "accept", I write that patch.

What the PR does now: Bun.Archive rejects when libarchive cannot read a header. This applies to files() and to every form of extract(). bun install, bun create, the --compile download, bun publish and bun pm diff do not change. The automated risk note in the walkthrough comment describes commit 7bda3509ab, which skipped a damaged header. Since f62aec355c, Bun.Archive rejects there.

What is new (2026-10-02):

• My self-review of this design is done. It raised four concerns. Two are the questions above. The PR body lists all four.
• 5b631f0525 removes Archive::read_free, which had no caller.
• fc4f010336 adds extract() without a glob to the three tests for damage inside the data of an entry.
• The title now says "reject when a header read fails". The old title said "reject damaged archives". That was more than the change does: a tar.gz with one flipped bit in the data of an entry still resolves.

Verified on this branch: test/js/bun/archive.test.ts has 12 tests that fail on main and pass here (120 pass, 1 skip). Five unmodified test/cli/install files pass on a release build. bun run rust:check-all passes for 12 targets. For clean and damaged tarballs, bun pm diff, bun publish --dry-run and bun install give output that is byte-identical to main in 12 of 12 commands. 22 valid archives give identical results and identical extracted trees on main and on this branch.

CI: build 122893 on fc4f010336 passed: 181 of 181 jobs.

Corrections I made to my own text in this PR:

• I counted six fixture files as sparse coverage. They are not sparse entries.
• I said that a bad header checksum only drops one entry. It can also make the members of a nested tar appear as entries. The first version of this PR spread that from extract(dir) to files() and to extract() with a glob. The current version rejects in all of them.
• I said that a check of files() can see those phantom entries. That was false. files() lists regular files only.
• On 2026-09-18 (17:50 UTC), for about one minute, this comment showed a GitHub API error message. A script of mine wrote a failed API response over the comment. I restored the text.
• I did not run a design review before I wrote the first version of this fix. The review that I ran later picked the current design.

Review state: no open threads.

How I reproduced it (bun 1.4.3-canary.1+b52d51348, Linux x64). The archive has a complete a.txt, then the first 100 bytes of the header of b.txt:

function header(name, size) {
  const h = Buffer.alloc(512);
  h.write(name, 0);
  h.write("0000644\0", 100);
  h.write("0000000\0", 108);
  h.write("0000000\0", 116);
  h.write(size.toString(8).padStart(11, "0") + "\0", 124);
  h.write("00000000000\0", 136);
  h.write("        ", 148);
  h.write("0", 156);
  h.write("ustar\x0000", 257);
  const sum = h.reduce((a, b) => a + b, 0);
  h.write(sum.toString(8).padStart(6, "0") + "\0 ", 148);
  return h;
}
const a = Buffer.concat([header("a.txt", 5), Buffer.from("hello"), Buffer.alloc(507)]);
const tar = Buffer.concat([a, header("b.txt", 5).subarray(0, 100)]);

console.log([...(await new Bun.Archive(tar).files()).keys()]); // [ "a.txt" ]
console.log(await new Bun.Archive(tar).extract("out-glob", { glob: "*" })); // 1
await new Bun.Archive(tar).extract("out"); // rejects: ReadError

On main the first two calls resolve. With this branch all three reject. files() rejects with Truncated tar archive detected while reading next header.

The tar.gz case from the report (an entry that fills exactly the first 64 KiB block of gzip output, then a cut stream) is one of the new tests in test/js/bun/archive.test.ts.

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Walkthrough

Archive reads and extraction now use a shared memory reader with an explicit damaged-block policy. Archive APIs report read failures, and CLI and installer callers set their policy. Tests cover corrupted archives across inspection and extraction.

Changes

Archive read error handling

Layer / File(s)	Summary
Memory reader and iterator src/libarchive/lib.rs	MemoryReader owns the archive and input borrow. ArchiveIterator delegates entry and data reads to it and preserves archive error text.
Extraction and overwrite scanning src/libarchive/lib.rs	ExtractOptions carries a damaged-block policy. Overwrite scanning and extraction use MemoryReader for archive entries and data.
Archive API error propagation src/runtime/api/Archive.rs	Counting, inspection, and extraction use MemoryReader. Filtered extraction removes partial files and returns ReadError for negative archive reads.
CLI and installer reader integration src/install/extract_tarball.rs, src/runtime/cli/*, src/standalone_graph/StandaloneModuleGraph.rs	Archive callers set a damaged-block policy. Pack and publish commands use the updated reader interfaces.
Corruption handling validation test/js/bun/archive.test.ts	Tests cover damaged headers and data, malformed archives, checksums, inspection results, extraction results, and partial-file cleanup.

Suggested reviewers: dylan-conway

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to fc4f0

Archive extraction reports damaged-header failures instead of silently succeeding. No established issue blocks merging, though the maintainer should decide whether rejecting trailing non-zero blocks is the desired behavior.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the main change: Bun.Archive rejects header-read failures and introduces a shared in-memory reader with an explicit policy.
Description check	✅ Passed	The description is comprehensive and covers the problem, implementation, behavior changes, risks, scope, and verification results. It does not use the template headings exactly, but it provides the re…

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Inline comments:
In `@src/runtime/api/Archive.rs`:
- Around line 155-164: Update count_files_in_archive to return
crate::Result<u32> and propagate read_next_entry errors instead of terminating
the loop with a partial count; then update Archive::write_format to handle and
propagate that result so failed archive reads produce an error rather than
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[claude]

Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.

[robobun]

^{Updated 8:57 AM PT - Oct 2nd, 2026}

✅ @robobun, your commit fc4f010336c0a683dbd6d4034d99cdf4db8e67ef passed in Build #122893! 🎉

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🧪   To try this PR locally:

bunx bun-pr 43242

That installs a local version of the PR into your bun-43242 executable, so you can run:

bun-43242 --bun

[claude]

I reviewed the latest push (helper moved into src/libarchive/lib.rs and reused by ArchiveIterator::next) and found no bugs, but because this changes what files() and extract(dir, {glob}) resolve or reject on damaged input, a maintainer should still weigh the behavior change.

What was reviewed:

• ArchiveIterator::next (used by bun publish and bun pm diff): the rewrite keeps the same Retry-continue / Eof-None / Ok|Warn-entry / Failed|Fatal-error mapping as before, so those commands are unaffected.
• extract_to_disk_filtered error exit: the partial file fd is closed and unlinked before the ReadError return, and dir_fd/the archive handle are released by their RAII guards.
• read_next_memory_entry lifetime: the returned &Entry is tied to &self and converted back to a raw pointer only for NextEntry, matching the prior pattern; Error::Fail exists in src/libarchive/error.rs.

Extended reasoning...

Overview

The diff touches src/libarchive/lib.rs (new ReadArchive::read_next_memory_entry helper, ArchiveIterator::next rewritten on top of it, a doc reword on Result::succeeded), src/runtime/api/Archive.rs (three header-read loops moved onto the helper; files() now rejects with libarchive's message on a failed header read; the glob extract path unlinks the partial file and returns ReadError on a negative archive_read_data; a read_error() helper dedupes the error mapping), and test/js/bun/archive.test.ts (a new describe block with seven cases across files(), files(glob), extract(dir), extract(dir, {glob}), and the inspect count).

Since the prior review the helper was moved from a private function in Archive.rs into the libarchive crate and ArchiveIterator::next (used by bun publish and bun pm diff) now calls it. I compared the old and new match arms in next: both continue on Retry, return None on Eof, yield the entry on Ok/Warn, and report "failed to read archive header" otherwise, so that path is behavior-preserving. The NextEntry still stores a raw *mut Entry obtained via as_mut_ptr(), which is the same pointer libarchive handed out.

Security risks

No new attack surface. Path safety checks (is_safe_path, symlink target validation) are untouched. The change is strictly on error propagation: inputs that previously produced a silently partial result now reject. The partial-file cleanup on a read failure runs before the early return, and dir_fd is released by CloseOnDrop, so the new early exit does not leak a descriptor or leave a truncated file behind.

Level of scrutiny

Moderate. The code is small and the refactor is verifiably equivalent at each site, but the user-visible semantics of Bun.Archive change for damaged archives: Retry (bad-checksum header block) now skips rather than stops in files() and the glob extract, and a tar with a non-block-aligned tail now rejects in files() where it previously resolved. The PR description itself flags the Retry choice as an open question for a maintainer, and the earlier inline threads on these points were resolved by the author rather than by an independent reviewer. That is a product decision rather than a bug, so a human maintainer should make the call; it is not something an automated review can settle.

Other factors

The new tests pin exact libarchive error strings ("Truncated tar archive detected while reading next header", etc.), which will need updating on a future libarchive bump but are otherwise strong assertions. The tests exercise every sibling entry point per case, which matches the variant-matrix expectation. The bug hunt ran to a dry streak with no findings.

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Inline comments:
Review comments at @src/libarchive/lib.rs:
- Line 215: Update the archive-reading loop’s Result::Retry arm to return
crate::Error::Fail instead of continuing, preventing payload blocks after a
damaged tar header from being parsed as new entries.

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[claude]

Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.