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WalkthroughPath APIs now support checked capacity handling, heap spillover for oversized thread-local results, and panic behavior for unchecked variants. Archive, system, and shell callers now handle overflow explicitly. Regression tests cover long and normalized paths. ChangesPath capacity APIs
Archive, system, and shell overflow handling
Suggested reviewers: Merge Risk: 🔵 Low · up to The runtime change is mergeable, but one path helper has an undocumented empty-input precondition that can cause a panic if misused; owner follow-up is recommended. The remaining test cleanup is localized and does not affect production behavior. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
Full details: Description checkExplanation The description explains the problem, implementation, affected callers, verification steps, tests, platform coverage, and follow-up work. It does not use the exact template headings, but it provides the required information and is complete. Comment |
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Status: rebased onto main (9db3653), waiting for CI. The previous run on a82dd60 was green except Reproduced on the released build (1.4.0 canary) with:
With this branch the first prints the module, |
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I reviewed this PR and didn't find any bugs. Because it rewrites the core path normalizer (every join/normalize/relative call in the resolver and bundler goes through it), changes ~15 public signatures, and introduces the spill_out heap-fallback with unsafe lifetime erasure, a human look at the design and hot-path implications would still be worthwhile.
What was reviewed:
- Every
has_roomguard innormalize_string_generic_tzagainst the write it precedes; the Windows-only growth cases (UNC trailing\,C:→C:., NT prefix) are covered. spill_out's ordering (previous spill freed only afteropreturns) and the pointer-range check for results that borrow an input instead ofbuf— Miri-tested viajoin_accepts_its_previous_spilled_result_as_input.- The
normalize_stringreturn-type change (&mut [u8]→&'static [u8]): the only external caller inrun_command.rsbinds to&[u8], so it's compatible. - All three out-of-crate callers of
normalize_string_generic_t*(sys/lib.rs,libarchive/lib.rs) are updated to handleNone; the tar extractors reserve the last unit for the NUL before calling.
Extended reasoning...
Overview
This PR rewrites src/paths/resolve_path.rs so that the core normalizer normalize_string_generic_tz bounds-checks every write and returns Option<&mut [T]> instead of writing past the buffer. On top of that it adds *_checked variants for every caller-buffer function (the old names now wrap them and panic with #[track_caller]), and a spill_out mechanism that lets the thread-local-buffer functions (join, join_abs_string, normalize_string, relative) fall back to a per-function heap buffer for oversized results. Callers in TarballStream.rs, libarchive/lib.rs, sys/lib.rs (Windows NT-path normalization), and the Windows shell path rewriter are updated to consume the Option and report ENAMETOOLONG. ~800 lines of changes to resolve_path.rs plus 15 new unit tests (Miri-checked) and integration tests in three suites.
Security risks
The change is security-adjacent: tar entry paths and shell operands are attacker-controlled, and the old behavior was a process abort (DoS) rather than memory corruption. The new behavior converts overflow to None/ENAMETOOLONG, which is strictly safer. I checked that the tar-extractor changes don't relax the absolute-path skip (they still normalize into a bounded buffer and is_absolute_windows_t runs on the normalized result), and that is_symlink_target_safe returning false on None fails closed. The spill_out unsafe block detaches a &'r mut from a fresh Vec's borrow so op can also borrow its inputs; the previous spill is freed only after op returns (documented, and the Miri test join_accepts_its_previous_spilled_result_as_input covers passing a spilled result back in).
Level of scrutiny
High. resolve_path.rs is on the hottest path in Bun — every module resolution, every bundler file, every bun install extraction goes through these functions. The PR changes public signatures (normalize_string now returns &'static [u8] instead of &mut [u8]; normalize_string_generic_t/_tz now return Option), introduces a new API convention (*_checked), and adds unsafe code with lifetime erasure. The author has clearly done the work (Miri, cross-platform testing, perf comparison against main, capacity-bound proofs with grid tests), but the scope of the design decisions — particularly whether the spill-to-heap-until-next-call semantics are what maintainers want for the thread-local wrappers, and whether the has_room checks in the inner loop have any measurable resolver-throughput cost in release builds — warrants a maintainer's eyes.
Other factors
The PR description is exceptionally thorough (Sentry IDs, related-PR cross-references, per-platform test-run notes). Test coverage is strong: exact-fit boundary tests for every checked variant, growth-case coverage for Windows normalization, and a capacity-bound grid test for relative_result_capacity. I confirmed the only external normalize_string caller (run_command.rs:2710) is compatible with the return-type change, and that all files calling the raw normalizer directly are updated in this diff. No prior human reviews on the timeline; CodeRabbit was rate-limited.
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Updated 4:29 PM PT - Aug 27th, 2026
❌ @robobun, your commit e11e5b9 has 4 failures in
🧪 To try this PR locally: bunx bun-pr 39658That installs a local version of the PR into your bun-39658 --bun |
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Pushed 4984462 for the A sweep of the other callers of the raw normalizer found two more shell sites, ported in the same commit:
New tests: |
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Thanks for addressing the earlier note — extract_to_disk_filtered now uses normalize_buf_z_checked and the new archive test exercises both the plain and { glob: '**' } paths. This run found no further issues. Given the scope (return-type change to the core normalizer used by every path helper, new spill_out unsafe thread-local heap spill, security-adjacent tar-extraction and shell operand handling), a human look is still worthwhile.
What was reviewed:
spill_outlifetime/ordering — the previous spill is replaced only afteropreturns, andjoin_accepts_its_previous_spilled_result_as_inputcovers the reuse case under Miri.has_roomguards on every write innormalize_string_generic_tzincluding the Windows-only NT-prefix, UNC-volume, drive-letter and trailing-NUL paths.- The four tar-extraction sites and the Windows
shell_get_path/cp/mvoperand paths now go through the*_checkedvariants and reportENAMETOOLONGonNone.
Extended reasoning...
Overview
The PR rewrites the core path normalizer (normalize_string_generic_tz in src/paths/resolve_path.rs) to bounds-check every write and return Option<&mut [T]>, then layers three things on top: (1) *_checked variants for every caller-buffer function that return None when the result does not fit, with the old names wrapping them and panicking with #[track_caller]; (2) a spill_out heap fallback for the thread-local-buffer functions (join, join_abs_string, normalize_string, relative) so they accept input of any length unchanged; (3) porting the raw normalizer callers (bun_sys::normalize_path_windows_opts, TarballStream, both libarchive extraction loops, Bun.Archive's glob-filtered extraction, the Windows shell path rewriter, and shell cp/mv) to the checked variants. Roughly +900/−200 in resolve_path.rs (over half of that is the new #[cfg(test)] block with 15 unit tests including a boundary-grid check for relative_result_capacity), plus five integration test files.
Since my earlier inline comment, commit 4984462 ported extract_to_disk_filtered (the fourth tar-extraction site) to normalize_buf_z_checked and extended the new archive test to run both .extract(out) and .extract(out, { glob: '**' }), and additionally ported the shell cp/mv target-path joins to join_z_buf_checked with new tests. That resolves the completeness gap I flagged.
Security risks
Tar entry names and shell operands are attacker-controllable input feeding path normalization; the pre-PR failure mode was a process abort (panic on the out-of-bounds slice index), which this change turns into a skipped entry / ENAMETOOLONG. The new spill_out contains unsafe (it materializes a &'r mut [u8] from a fresh Vec's pointer, then moves the Vec into a thread-local after op returns) — the SAFETY reasoning looks sound and it is covered under Miri, but it is exactly the kind of provenance/lifetime dance that benefits from a second reader. The tar-extraction changes preserve the existing normalize-then-reject-../absolute ordering, so containment is unchanged.
Level of scrutiny
High. normalize_string_generic_tz is on the hot path of module resolution, bundling, install, and every filesystem operation; its return type changed and every write now goes through a length check. The author benchmarked (~2 ns/call, within layout noise) and moved the scratch fallbacks out of line to keep the fast path clean, but a maintainer should confirm that trade-off and the overall API shape (*_checked vs the panicking wrappers, the Placed struct, normalize_string's return changing from &mut [u8] to &'static [u8]).
Other factors
The comment-cop bot flagged long comments on an earlier revision; those threads are all resolved and df76ade shortened them. The PR description enumerates related open PRs it supersedes and Sentry events it closes — a maintainer will want to reconcile those. Test coverage is thorough (unit tests exercise exact-fit boundaries, the Windows-only growth cases, the NT prefix, and the spill path; integration tests fail on the released build per the robobun status comment). The normalize_string signature change from &mut [u8] to &'static [u8] is a source-level API change worth a maintainer's eye even though every in-tree caller compiles.
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For the human look the review asks for, the two places to read are |
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I re-reviewed after 4984462 and didn't find further bugs. Given the scope — new unsafe in spill_out, public return-type changes on normalize_string/normalize_buf_t/normalize_string_generic_t{,z}, and a substantial refactor of the resolver's hot-path normalization — a human pass on the two places the author flagged (spill_out at resolve_path.rs:37 and the signature changes) is still warranted.
What was reviewed:
spill_out's pointer-range check and the free-after-op ordering (previous spill can be an input) — looks sound; Miri-covered byjoin_accepts_its_previous_spilled_result_as_input.- All
has_roominsertions innormalize_string_generic_tztraced against each write site; the reordered segment-copy (separator now checked with the segment) preserves behavior. - The NT-prefix branch of
_join_abs_string_bufwithIS_SENTINEL: the NUL now comes from the inner call at the offset slice, equivalent to the old explicit write. - The four tar-extraction sites and three shell sites now agree on normalize-first-then-check; the glob-filtered extractor was the last one and is fixed.
Extended reasoning...
Overview
This PR rewrites the bounds-checking contract of src/paths/resolve_path.rs — the shared path-normalization primitive used by the resolver, bundler, installer, shell, and bun_sys. The core normalizer normalize_string_generic_tz now returns Option and checks capacity before every write; ~10 public *_buf functions gain *_checked twins (the old names wrap them with a named panic); the thread-local wrappers (join, join_abs_string, normalize_string, relative) spill oversized results to a per-thread heap Vec via a new spill_out helper so they accept any input length. Six caller sites (three tar extractors, shell_get_path, shell mv/cp) are ported to the checked variants and report ENAMETOOLONG. ~950 lines changed in resolve_path.rs plus 15 new unit tests (Miri-run) and 5 integration test files.
Security risks
Path handling for archive extraction is security-adjacent (traversal, absolute-path escape). The change here moves the length limit from the raw archive name to the normalized path, which is strictly more permissive for entries whose names collapse — but the existing traversal/absolute checks run after normalization on the same result, so no new escape surface is introduced. The new unsafe in spill_out launders a heap slice to &'static under the same "valid until next call on this thread" contract as the existing tl_buf_mut; the free-after-op ordering handles the case where the previous spill is an input of the current call. Miri covers it.
Level of scrutiny
High. This is the resolver hot path (benchmarked at ~60-120 ns/call, invoked millions of times per build), it changes public return types across the workspace, and it introduces a non-trivial unsafe block with a lifetime argument that depends on caller discipline. The author's own comment explicitly invites human review of spill_out and the signature changes. The comment-cop bot flagged ~50 comment-length lints (all now resolved after df76ade shortened them), which is a signal of how much explanatory scaffolding the change carries.
Other factors
My earlier inline finding (the glob-filtered extract_to_disk_filtered still using the raw-length pre-check) was addressed in 4984462 along with two additional shell sites found in the same sweep. Test coverage is thorough: unit tests exercise exact-fit boundaries, the Windows-specific one-unit-growth cases, the NT-prefix/NUL headroom, the scratch-buffer fallback for collapsing paths, and the spill mechanism including reusing a spilled result as input. Integration tests fail on the released build per the robobun verification comment. The relative_platform_buf refactor (extracting normalize_relative_input) is a meaningful control-flow change that I traced against the original but would benefit from a second pair of eyes given how many callers depend on its exact scratch-buffer choreography.
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On the
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relative that spills
#39824
… is not a file path as-is (#39828) ### Problem - A frame in a long `data:` URL module aborts the JUnit reporter and the `GITHUB_ACTIONS` annotation: `panic: range end index 6103 out of range for slice of length 4096`. A long `//# sourceURL=` name does the same. - Cause: `record_failure` (`src/runtime/cli/test_command.rs:386`) and `print_github_annotation` (`src/jsc/VirtualMachine.rs:6621`, `:6683`) call `resolve_path::relative` on the source URL of every frame. `relative` writes into fixed path buffers with no length check. A source URL is not always a path. - The same call mangles a short URL: `webpack://app/./x.ts` prints as `webpack:/app/x.ts`. ### Fix - `ZigStackFrame::relative_source_url` calls `relative` only for an absolute path shorter than `MAX_PATH_BYTES`, and returns any other source URL unchanged. The three sites use it. - Correct because the reports relativize files. A file that bun loaded is an absolute path that fits a path buffer. Any other source URL has no relative form, and the plain error printer already prints it as-is. File paths print as before. - `resolve_path.rs` is not changed. #39658, #38392 and #38696 each add a length-safe `relative` there. - Verified: new tests in `test/js/junit-reporter/junit.test.js`, `test/cli/test/bun-test.test.ts` and `test/js/bun/test/stack.test.ts`. They fail on the released build. The three files pass in full. ### Background - The `source_url` of a frame is what JSC recorded for its code. For a file module it is the absolute path. For a `data:` module it is the whole URL. For eval'd code it is the `//# sourceURL=` name. - `resolve_path::relative(from, to)` normalizes both arguments into thread-local `PathBuffer`s and builds the `../` form in a third. It first joins a `to` that is not absolute onto the cwd. - Both reports run from the error printer for every error bun prints, so plain `bun test` in GitHub Actions hits this too. <details><summary>Notes</summary> - Repro on the released 1.4.0 build (Linux): `throw.mjs` with `await import("data:text/javascript," + encodeURIComponent("throw new Error('boom');" + "//".padEnd(6000, "x")))`. `GITHUB_ACTIONS=true bun throw.mjs` prints `error: boom`, then panics with `range end index 6055`, exit 134. The same module imported from a test, run with `bun test --reporter=junit --reporter-outfile=out.xml`, panics with `range end index 6103` and writes no report. `GITHUB_ACTIONS=true bun test` on that test panics too. `//# sourceURL=/` followed by 100000 bytes panics with `range end index 100000 out of range for slice of length 4095` (the absolute branch of `relative`). - The mangling: `relative` normalizes the URL (`//` to `/`, `.` segments dropped), joins it onto the cwd and relativizes it against `dir`. With `GITHUB_WORKSPACE` outside the cwd it also gets a `../` prefix. `test/js/bun/test/err-custom-fixture.js` shows the shape on an error object with an `http:` sourceURL: the released build prints `file=http%3A/example.com/test.js`, this change prints `file=http%3A//example.com/test.js`. A remapped frame whose sourcemap `sources` entry is a `webpack://` URL is the same case. - The `file=` property for a non-path top frame keeps the content it has today for a short URL (`file=data%3Atext/javascript...`). Which frame the annotation points at is #38335. That PR edits the same header block, so one of the two gets a small textual conflict. The frame list of the annotation already printed the raw URL through `source_url_formatter`. It uses `file` only for the empty check and, on the dev server, as the prefix to strip. - Not covered, on purpose: an absolute path a few bytes under `MAX_PATH_BYTES` can still overflow inside `relative` when the `../` chain for `dir` does not fit next to it. Every caller of `relative` has that defect (#38696 describes it) and #39658 and #38392 fix it. It needs a path within about `3 * depth(dir)` bytes of the limit. The length check here only turns the unbounded input (a URL or a `sourceURL` name of any length) away, and becomes redundant once one of those PRs lands. - `print_error_instance_body` runs the JUnit `record_failure` callback and, under `GITHUB_ACTIONS`, `print_github_annotation` for every error bun prints. So `bun test` in GitHub Actions hits this without `--reporter=junit`, and so does `bun run`. The buffers are `MAX_PATH_BYTES` long: 4096 on Linux, 1024 on macOS, 98302 on Windows. - #39824 is the sibling fix for the coverage report, which makes the same call on coverage entries. It does not touch these sites. - Tests pad to 100000 bytes so that the crash cases also exceed the Windows buffer. The JUnit test also pins that a frame in the test file and an absolute `sourceURL` are still relativized. The `GITHUB_WORKSPACE` test pins that a test file is reported relative to the workspace and that a `webpack://` URL is not. On the released build the tests fail with exit 134 and with the mangled URL. - Checked: `cargo fmt --all -- --check`, prettier on the three test files, `test/internal/source-lints`, `bun bd test` on `junit.test.js` (9 pass), `stack.test.ts` (7 pass, 1 todo) and `bun-test.test.ts` (97 pass, 6 todo). Clippy was not run locally. </details>
… fit the path buffer (#39735) ### Problem - `bun install` from a project directory close to PATH_MAX aborts once a dependency declares a bin: `panic: index out of bounds: the len is 4096 but the index is 4096`. `bun link` with a global directory that deep aborts too. Found by an audit of this file. There is no user report. - `Linker::build_target_package_dir` (`src/install/bin.rs:1523`) and `build_destination_dir` (`bin.rs:1554`) copy `<node_modules>/<package>/` and `<node_modules>/.bin/` into their buffers with no length check. `link()` and `unlink()` call both before the bin name checks. The Zig version had the same copy (notes). ### Fix - Both builders return `None` when the directory is `MAX_PATH_BYTES` or longer, so no NUL fits after it. `link()` and `unlink()` then set `Error::Sys(ENAMETOOLONG)` and return. - The bin name checks in `link()` use this bound and this error. The OS refuses such a path with `ENAMETOOLONG`, so this is the OS error, one step earlier. A directory that does not fit never got a bin linked, so `unlink()` gets the same bound. - The callers already print `Linker::err` and exit 1. `bun install` prints `error: Failed to link has-bin: ENAMETOOLONG` and keeps the package installed. - Verified: `test/cli/install/bun-install-registry.test.ts`, block `directories longer than the path buffer`. Its three tests abort without the fix. Also the rest of its `binaries` block and the `isolated-install`, `native-binlink`, `bun-link` and `shebang-normalize` suites. ### Background - `bin::Linker` links the bins of one package. Per bin it builds two NUL terminated absolute paths in buffers of the caller: `<node_modules>/<package>/<file>` and `<node_modules>/.bin/<name>` (`<global bin dir>/<name>` for `-g` and `bun link`). - `MAX_PATH_BYTES` is the size of these buffers: 4096 on Linux, 1024 on macOS, about 96 KiB on Windows. PATH_MAX counts the NUL, so a usable path has at most `MAX_PATH_BYTES - 1` bytes. - One site of the path buffer sweep that #39403 folds. Written to be folded (notes). <details><summary>Notes</summary> Relation to the fold (#39403, branch `claude/install-mega`). The fold converts every other raw path write in `bin.rs` (#38954) but leaves these two builders as they are, so this is the rest of that file. The diff touches the two builders and their two call sites only. Checked with a cherry-pick onto the fold head `65bd4dd91d`: `bin.rs` merges without a conflict. The test block lands inside the fold's `binaries` block. It needs two things there: the import conflict of two adjacent lines, and `const { packageDir, env } = await setupTest();` as the first line of its two test bodies, because the fold creates the project directory per test. The helpers take the directory and the env as arguments for that reason. `componentsUpTo` has the shape of the helper #38954 adds, so one of the two can go. Sibling sites, each with its own open PR. They are independent of the two builders, so each lands on its own: - `<package>/<bin file>` under a package directory that still fits: `resolve_bin_target` joins it in a thread local buffer and aborts on main. #38954 checks those joins in this file, #39658 makes the thread local joins spill to the heap. A 4065 byte cwd with `typescript` is in that range. From the point where the directory itself no longer fits, this PR is the one that applies. - The second `bun install` in the same project aborts in `PackageInstall::uninstall_before_install` (`src/install/PackageInstall.rs:1967`), a thread local `join_abs_string` of `<node_modules>/.old-<random>`. #39658 covers it with no change at that caller. - `bun unlink` with such a global directory aborts in `unlink_command.rs:115` before it reaches `unlink()`, in its own thread local `join_abs_string_z` of `<global node_modules>/<name>`. #39658 covers that one too. - The isolated linker aborts while it builds the store path (`isolated_install/Installer.rs:2784`), before it links bins. That is the area of #37400 and #37424, so there is no isolated test here. Why `unlink()` has no test of its own. Its new early return has no observable effect: one byte below the bound, `bun unlink` prints `success: unlinked package` and exits 0 with and without this change, because `bun link` never created a bin for such a directory, and `unlink_command` does not read `Linker::err` (`unlink_command.rs:216`, as before). At the bound it aborts earlier, see above. Callers of `link()`: the hoisted installer (`PackageInstaller::link_tree_bins`, prints `Failed to link <alias>: <error>`), the isolated installer (`Step::Binaries` and `link_dependency_bins`, print `failed to link binaries for package`), and `link_command` (prints `failed to link bin due to error ENAMETOOLONG`). Test shapes. Each test builds a directory under the test's tmp directory out of names of at most 200 bytes, so that one path is exactly `MAX_PATH_BYTES` long: - `<project>/node_modules/has-bin`: the `has-bin/` prefix is one byte too long (`build_target_package_dir`, through `bun install`). - `<project>/node_modules/.bin` with a package named `a`: the package directory fits and `.bin/` is one byte too long (`build_destination_dir`, through `bun install`). - `<global dir>/node_modules/has-bin` through `BUN_INSTALL_GLOBAL_DIR`: `build_target_package_dir` through `bun link`, which also runs the global branch of `build_destination_dir`. After the command, the test renames the first long directory name so that it can inspect and delete the paths below the limit. Windows is skipped: its buffer is larger than any path the OS accepts. History. The Zig builders (`bin.zig`, `buildTargetPackageDir` and `buildDestinationDir`) had the same unchecked copies. A release build of Bun 1.3 wrote past the buffer and went on, which is why 1.3.14 exits 0 here. That was not correct behavior, so this is not a regression test case. `bun-link.test.ts` has one failure with a debug build on main as well: `should link dependency without crashing` expects exact stdout, and a debug build prints the failure trace. It is unrelated to this change. </details> <!-- robobun:evidence:begin --> --- **no test proof** · iteration 0 · Platform-specific test(s) that do not run on this machine. Deferring to CI, which covers all platforms: test/cli/install/bun-install-registry.test.ts <!-- robobun:evidence:end -->
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Note for when this lands: |
…ults to the heap normalize_string_generic_tz wrote into the caller's buffer without checking its length. Every join*, normalize* and relative* function in resolve_path.rs writes through it, so a path longer than the buffer behind any of them was a panic in the slice indexing instead of an error. Callers with user input kept getting patched one at a time. The normalizer now checks every write and returns None when the output does not fit. The functions that take a caller buffer get a *_checked variant that returns None when the result does not fit; the existing names are wrappers over them that panic with a message that names the problem. The functions that return a slice of a thread-local buffer (join, join_z, join_abs_string, join_abs_string_z, normalize_string, relative, relative_platform, relative_normalized) compute a result that does not fit the fixed buffer in a heap buffer that is kept until their next such result, so their callers work for input of any length without changes. relative keeps its result in an input-sized buffer when the inputs do not fit the path buffers either. The raw normalizer callers are moved to the checked results: the Windows openat path normalizer in bun_sys reports ENAMETOOLONG, the two tar extractors skip an entry whose normalized path does not fit (the NUL terminator now has a reserved slot, so a Windows name that grows by one unit during normalization no longer writes past the buffer), and the Windows shell path rewrite reports ENAMETOOLONG for an operand that does not fit.
…atch fallbacks out of line mordant flagged the (start, len) tuple that join_string_buf_t returned. Placed carries the two fields by name. The relative helpers normalize each input with its own call instead of returning a pair. The scratch-buffer fallbacks of normalize_string_buf_t and join_normalize_into move into cold functions so that the in-place path stays small, and has_room does one comparison: the write position never exceeds the buffer length.
…e checked variants Bun.Archive#extract with a glob still skipped an entry by the length of its name as written, so it dropped an entry that the plain extract now extracts. The shell mv builtin normalized basename(src) into a path buffer before its length check, and cp joined its target into one with no check at all; an operand longer than the buffer took the process down. Both now report ENAMETOOLONG for that operand.
resolve_path::z has its own contract and is not covered by the checked variants, so the paragraph names the join, normalize and relative buffer functions instead of every caller-buffer function.
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Inline comments:
In `@src/paths/resolve_path.rs`:
- Around line 1669-1682: Update the documentation for join_abs_string_z to
explicitly state that parts must be non-empty, preserving the implementation
unchanged.
In `@test/js/bun/archive.test.ts`:
- Around line 821-823: Replace the inline require("node:fs") in the extract.ts
fixture with a module-scope default import from node:fs, leaving the archive
construction and test behavior unchanged.
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src/CLAUDE.mdsrc/install/TarballStream.rssrc/libarchive/lib.rssrc/paths/resolve_path.rssrc/runtime/api/Archive.rssrc/runtime/shell/builtin/cp.rssrc/runtime/shell/builtin/mv.rssrc/runtime/shell/interpreter.rssrc/sys/lib.rstest/js/bun/archive.test.tstest/js/bun/resolve/resolve.test.tstest/js/bun/shell/bunshell.test.tstest/js/bun/shell/commands/cp.test.tstest/js/bun/shell/commands/mv.test.ts
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The NUL-terminated variants have always hit unreachable!() on no parts, since the result would be cwd itself. The archive fixture imports node:fs at module scope.
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Closing in favor of #43067. It contains this change, rebased onto main, together with the caller ports that were in the other pull requests. |
Problem
panic: range end index 100072 out of range for slice of length 4095(a 100 KBsideEffectsentry). Nine Sentry signatures, listed in the notes.normalize_string_generic_tz(src/paths/resolve_path.rs:912on main), which never readsbuf.len(). Callers get patched one at a time (resolver: don't abort on a package.json browser map key longer than 1024 bytes #37526, cli: stop aborting on --cwd and --tsconfig-override values longer than the path join buffer #38368, shell(mkdir, touch): report operands longer than the path buffers instead of aborting #38379) and new callers regress.Fix
Nonewhen the output does not fit.*_checkedvariant. The old name wraps it and panics with a message that names the caller.bun_sys, tar extraction, the shell) skip the entry or reportENAMETOOLONG.cargo test -p bun_paths(15 new tests, also under Miri). New tests intest/js/bun/resolve/resolve.test.ts,archive.test.tsand three shell files fail on the released build (Linux, Windows).Background
resolve_path.rsfills either a caller'sPathBuffer(the longest path the OS accepts) or a 1 KB or 4 KB thread-local buffer, valid until the next call.normalize_string_generic_tzin place. Its output is at most one unit longer than its input, so a buffer sized from the input holds it...segments needs room for its intermediate form.normalize_string_buf_tuses a scratch buffer for that case.spill_outfrees the previous heap result after the new one exists: it can be an input of the new call.Notes
index out of bounds: the len is 32767 but the index is 32767(a tar entry on Windows,extract_to_dir),range end index 98302 out of range for slice of length 98301(relativeon a 98302-bytefile:path, Windows),range end index 100064 out of range for slice of length 98301(a shell operand, Windows),range end index 1106 out of range for slice of length 1024(normalize_stringinrun_command.rs, Windows),range end index 100002 out of range for slice of length 98219andindex out of bounds: the len is 98302 but the index is 98302(folder_resolver.rs).write_u8_partis an inlined-frame attribution. The length in its message is the caller'sPathBuffer. BUN-4ABX, 4AC8 and 4ABY arenormalize_package_json_path's own unchecked concatenation infolder_resolver.rs, which install: stop aborting on link: specifiers and patch paths longer than the path buffers #38359 rewrites (it is part of install: fold the open bun install / pm / pack+publish PRs into one branch (171 PRs) #39403), so this PR leaves install alone except for thenormalize_buf_tcall inTarballStream.rs. With this PR a 4096-bytefile:dependency on Linux gets pastparse_dependency'srelativeand still stops infolder_resolver.rs. BUN-4AB4 is fixed by the thread-local change with no caller change.relativehad one byte of slack by accident (the normalizer drops the leading/and the caller puts it back), which is why BUN-4ABZ only fired on Windows. The unit tests cover the overflow directly.resolve_path.rs): paths: size the thread-local join output buffers to MAX_PATH_BYTES on Windows #36340 (thread-local buffer sizes), resolver: don't abort on a package.json sideEffects entry longer than the join buffer #37529 (sideEffects, the entry now also keeps working instead of being dropped), cli: stop aborting on absolute script paths longer than 1024 bytes on Windows #37528 (normalize_stringin run_command), shell(windows): report ENAMETOOLONG for operands that do not fit the path buffer #38205 (shell operands inshell_get_path), shell(mv): report ENAMETOOLONG instead of panicking when a source name does not fit the path buffers #37527 (shellmv), shell(cp): report ENAMETOOLONG instead of panicking on operands longer than the path buffers #38162 (shellcp). The shell hunks here are those three fixes written on top of the checked variants.relative*/join_abs*thread-local callers are covered, their caller-buffer sites still need the caller to report the error, and can use the checked variants instead of the helpers they add toresolve_path.rs): paths: heap-backed relative_alloc and join_abs_string_buf_spill; use them in _nodeModulePaths and the runtime linker #38392 (resolver_jsc.rs), bundler: fix panic relativizing a source path close to MAX_PATH_BYTES #38696 and bundler: fail the build instead of aborting when a naming template renders an output path that does not fit a path buffer #37502 (relative_platform_bufinChunk.rsandgenerateChunksInParallel.rs), pack/publish: stop panicking on package.json bin and files entries longer than the path buffer #38784 (bun pm packandbun publishentries), sourcemap: don't abort when a remapped source path exceeds the join buffer #37457 (get_source_codeinMapping.rs), Bun.build: report an error for HTML rooted script src paths >= 4096 bytes instead of aborting #35860 (the bundler's error report). Until then those sites panic with the message that names them instead of a slice index.shell_get_pathto take the cwd string and to be infallible, so as written it keeps the unchecked splice andjoin_z_buffor an operand that does not fit. Whichever of the two lands second keeps the fallible shape from this PR (checked join,ENAMETOOLONG) on the cwd-string signature. Itsmove_in_dirhunk inmv.rsoverlaps textually with the one here (a call gains a parameter).*_spillhelpers (join_spill,join_z_spill,join_abs_string_spill,normalize_string_spill,join_z_buf_spill, callers in 9 files) keep working unchanged. Now that the thread-local functions take any length, theVecvariants only matter for a caller that holds a long result across another call. Folding their callers back onto the plain names is a follow-up that has to look at each caller, so it is not in this PR.resolve_path::z(a plain copy into aPathBuffer, 33 callers) is unchanged. It has its own contract (debug panic, empty string in release) and no normalizer behind it. The CLAUDE.md paragraph names thejoin*_buf/normalize*_buf/relative*_buffamilies only.normalize_stringreturns&'static [u8]instead of&mut [u8](no caller wrote through it).normalize_buf_t,normalize_string_generic_tandnormalize_string_generic_tzreturnOption. Every other public name keeps its signature (the private helpers under them returnOptiontoo). Theunsafethis PR adds isspill_out(resolve_path.rs:37), covered under Miri by the spill tests.join_neededgains one byte so that the.result of no parts also fits with its NUL.normalize_stringandjoin_abs_stringnow send an input whose size bound exceeds the fixed buffer to the heap even when its result would have fit. That only affects inputs of more than 1 KB / 4 KB.bun_paths, minimum of 10 interleaved runs of 5M calls each, main against this branch:join_abs_string_buf116.7 against 118.8 ns (..segments) and 83.9 against 86.7 ns (./name),normalize_string_buf58.9 against 60.7 ns (POSIX rules) and 53.0 against 52.7 ns (Windows rules). The per-segment work is one length comparison that replaces the slice-indexing check it makes redundant. Differences of a few ns are within the layout noise of this benchmark (single instantiations swing more in both directions).test/js/bun/resolve/load-same-js-file-a-lot.test.ts(2000 imports, debug + ASAN) takes the same time as a build of main within noise. Its 5 s test fails on main in this build too.relative_result_capacityholds for any input shape, including non-normalized ones (relative_result_capacity_bounds_every_input_shapechecks a grid).relative_spills_inputs_and_results_longer_than_a_path_bufferis ignored under Miri only because path-buffer-sized inputs take about 40 s there. The unsafe code on that path isspill_out, which the join tests cover under Miri (join_accepts_its_previous_spilled_result_as_input).bun install,Bun.Archive#extractwith and without a glob) now extract an entry whose name is too long as written but normalizes to a path that fits (d/../repeated). Short names with..already extracted that way (thearchive-path-dotstest). The limit now applies to the path that is created, which is the one the OS checks.Bun.Archivedoes not log skipped entries andbun installdoes, as before. The first revision missed the glob variant (a review finding).test/js/bun/shell/bunshell.test.ts,shell/commands/mv.test.ts,shell/commands/cp.test.ts): the Windows operand rewrite inshell_get_pathis the Sentry signature.mv src dirnormalizedbasename(src)into aPathBufferbefore its length check, on every platform (panic: range end index 5000 out of range for slice of length 4096on Linux).cpjoined its target into aPathBufferwith no check. The builtin is on by default on Windows and behindBUN_ENABLE_EXPERIMENTAL_SHELL_BUILTINSelsewhere. Its source goes through the thread-localjoin_z, which the heap fallback covers. Both printFile name too longwith the operand, like their other errors, andmvexits with the errno.cdandrmalready size or check their buffers. The remaining caller-buffer sites take bounded input or the project's own files (thebinfield inbun pm packandbun publish, thebun createarguments). On absurd input they now panic with the message that names the caller instead of a slice index.join_abs_string_buf_checkeddocuments thatNonemeans the result does not fit. The scratch fallback innormalize_string_buf_tkeeps that true for a path that..segments shorten below its intermediate form. The fallback is out of line and does not run on the fast paths (see the timing note).join_abs_string_buf_windows. shell(ls): decide operand errors with lstat, not the O_DIRECTORY errno #40091 addedshell_lstatat, a newshell_get_pathcaller forls, which panics on a long operand on the current canary (range end index 100021 out of range for slice of length 98301). It now passes its syscall tag and reportsls: <name>: File name too long, covered by the Windows shell test. JUnit report and GitHub Actions annotation: print a frame source that is not a file path as-is #39828'sMAX_PATH_BYTESguard inZigStackFrame::relative_source_urlbecomes unnecessary oncerelativetakes any length. Removing it changes the expected output of two reporter tests, so that is a follow-up.Bun.buildentry point), FileSystemRouter: throw when a relative dir does not fit in the path buffer instead of aborting #39307 (FileSystemRouterdir, which now panics with the new message).sideEffectsentries never match on Windows (sideEffects glob patterns broken on Windows #30320), so the bundling test is skipped there. The runtime test is the crash case on every platform.normalizer_reports_instead_of_writing_past_the_buffer,normalizer_checks_the_units_windows_adds_to_its_input,normalizer_checks_the_nt_prefix_and_the_nul,checked_buffer_variants_fit_exactly,join_checked_variants_only_need_room_for_the_result,join_needed_holds_for_the_results_that_grow,join_abs_needed_holds_for_the_results_that_grow,relative_checked_variants_fit_exactlyand_on_windows,relative_result_capacity_bounds_every_input_shape,normalize_string_spills_results_longer_than_its_fixed_buffer,join_spills_results_longer_than_its_fixed_buffer,join_accepts_its_previous_spilled_result_as_input,join_abs_string_spills_results_longer_than_its_fixed_buffer,relative_spills_inputs_and_results_longer_than_a_path_buffer. Two highway stubs were added to the test module becauserelativereacheslast_index_of_char.test/js/bun/resolve,archive.test.ts,shell/bunshell.test.ts,shell/commands,bundler_splitting,bundler_naming,esbuild/dce,install/bun-install-streaming-extract,bun-link,bun-workspaces,test/js/node/path. The failures seen are unrelated and reproduce without this change: the root-userlspermission tests, the 5 s import-loop test,bun-link's stdout comparison against the debug-only install trace, and one RSS test that passes when run alone. On Windows (debug):archive,resolve,bunshell,shell/commands/mvandcp,node/fs/fs.test.ts,bun-install-streaming-extract. Thetilde_expansionandreadSync large filesfailures there reproduce with the released build on the same machine.no test proof · iteration 2 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/bun/shell/commands/mv.test.ts, test/js/bun/shell/commands/cp.test.ts, test/js/bun/shell/bunshell.test.ts, test/js/bun/resolve/resolve.test.ts, test/js/bun/archive.test.ts