mirror of
https://github.com/oven-sh/bun
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5971bf67ef
## Summary Fixed an off-by-one error in buffer allocation for several path module functions when handling paths longer than `PATH_SIZE` (typically 4096 bytes on most platforms). ## Changes - `normalizeJS_T`: Added +1 to buffer allocation for null terminator - `relativeJS_T`: Added +1 to buffer allocation for null terminator - `toNamespacedPathJS_T`: Added +9 bytes (8 for possible UNC prefix + 1 for null terminator) ## Test plan - Added tests for `path.normalize()` with paths up to 100,000 characters - Added tests for `path.relative()` with very long paths - All existing path tests continue to pass The issue occurred because when a path is exactly equal to or longer than `PATH_SIZE`, the buffer was allocated with size equal to the path length, but then a null terminator was written at `buf[bufSize]`, which was out of bounds. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Bot <claude-bot@bun.sh> Co-authored-by: Claude <noreply@anthropic.com> Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
89 lines
3.6 KiB
JavaScript
89 lines
3.6 KiB
JavaScript
import { describe, test } from "bun:test";
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import assert from "node:assert";
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import path from "node:path";
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describe("path.relative", () => {
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test("general", () => {
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const failures = [];
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const relativeTests = [
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[
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path.win32.relative,
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// Arguments result
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[
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["c:/blah\\blah", "d:/games", "d:\\games"],
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["c:/aaaa/bbbb", "c:/aaaa", ".."],
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["c:/aaaa/bbbb", "c:/cccc", "..\\..\\cccc"],
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["c:/aaaa/bbbb", "c:/aaaa/bbbb", ""],
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["c:/aaaa/bbbb", "c:/aaaa/cccc", "..\\cccc"],
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["c:/aaaa/", "c:/aaaa/cccc", "cccc"],
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["c:/", "c:\\aaaa\\bbbb", "aaaa\\bbbb"],
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["c:/aaaa/bbbb", "d:\\", "d:\\"],
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["c:/AaAa/bbbb", "c:/aaaa/bbbb", ""],
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["c:/aaaaa/", "c:/aaaa/cccc", "..\\aaaa\\cccc"],
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["C:\\foo\\bar\\baz\\quux", "C:\\", "..\\..\\..\\.."],
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["C:\\foo\\test", "C:\\foo\\test\\bar\\package.json", "bar\\package.json"],
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["C:\\foo\\bar\\baz-quux", "C:\\foo\\bar\\baz", "..\\baz"],
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["C:\\foo\\bar\\baz", "C:\\foo\\bar\\baz-quux", "..\\baz-quux"],
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["\\\\foo\\bar", "\\\\foo\\bar\\baz", "baz"],
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["\\\\foo\\bar\\baz", "\\\\foo\\bar", ".."],
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["\\\\foo\\bar\\baz-quux", "\\\\foo\\bar\\baz", "..\\baz"],
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["\\\\foo\\bar\\baz", "\\\\foo\\bar\\baz-quux", "..\\baz-quux"],
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["C:\\baz-quux", "C:\\baz", "..\\baz"],
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["C:\\baz", "C:\\baz-quux", "..\\baz-quux"],
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["\\\\foo\\baz-quux", "\\\\foo\\baz", "..\\baz"],
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["\\\\foo\\baz", "\\\\foo\\baz-quux", "..\\baz-quux"],
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["C:\\baz", "\\\\foo\\bar\\baz", "\\\\foo\\bar\\baz"],
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["\\\\foo\\bar\\baz", "C:\\baz", "C:\\baz"],
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],
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],
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[
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path.posix.relative,
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// Arguments result
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[
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["/var/lib", "/var", ".."],
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["/var/lib", "/bin", "../../bin"],
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["/var/lib", "/var/lib", ""],
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["/var/lib", "/var/apache", "../apache"],
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["/var/", "/var/lib", "lib"],
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["/", "/var/lib", "var/lib"],
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["/foo/test", "/foo/test/bar/package.json", "bar/package.json"],
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["/Users/a/web/b/test/mails", "/Users/a/web/b", "../.."],
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["/foo/bar/baz-quux", "/foo/bar/baz", "../baz"],
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["/foo/bar/baz", "/foo/bar/baz-quux", "../baz-quux"],
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["/baz-quux", "/baz", "../baz"],
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["/baz", "/baz-quux", "../baz-quux"],
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["/page1/page2/foo", "/", "../../.."],
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],
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],
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];
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relativeTests.forEach(test => {
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const relative = test[0];
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test[1].forEach(test => {
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const actual = relative(test[0], test[1]);
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const expected = test[2];
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if (actual !== expected) {
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const os = relative === path.win32.relative ? "win32" : "posix";
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const message = `path.${os}.relative(${test
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.slice(0, 2)
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.map(JSON.stringify)
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.join(",")})\n expect=${JSON.stringify(expected)}\n actual=${JSON.stringify(actual)}`;
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failures.push(`\n${message}`);
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}
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});
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});
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assert.strictEqual(failures.length, 0, failures.join(""));
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});
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test("very long paths", () => {
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// Regression test: buffer overflow with very long paths
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// This used to panic because the buffer didn't account for the null terminator
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const longPath1 = "/home/" + "a".repeat(50000);
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const longPath2 = "/home/" + "b".repeat(50000);
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const result = path.relative(longPath1, longPath2);
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// Should return something like "../bbb...bbb"
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assert.ok(result.startsWith(".."));
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assert.ok(result.includes("b"));
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});
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});
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