fsck: implement checks for gitattributes

Recently, a vulnerability was reported that can lead to an out-of-bounds
write when reading an unreasonably large gitattributes file. The root
cause of this error are multiple integer overflows in different parts of
the code when there are either too many lines, when paths are too long,
when attribute names are too long, or when there are too many attributes
declared for a pattern.

As all of these are related to size, it seems reasonable to restrict the
size of the gitattributes file via git-fsck(1). This allows us to both
stop distributing known-vulnerable objects via common hosting platforms
that have fsck enabled, and users to protect themselves by enabling the
`fetch.fsckObjects` config.

There are basically two checks:

    1. We verify that size of the gitattributes file is smaller than
       100MB.

    2. We verify that the maximum line length does not exceed 2048
       bytes.

With the preceding commits, both of these conditions would cause us to
either ignore the complete gitattributes file or blob in the first case,
or the specific line in the second case. Now with these consistency
checks added, we also grow the ability to stop distributing such files
in the first place when `receive.fsckObjects` is enabled.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
3 files changed
tree: a79a1b51547323fdcf5378096560f2c45960f023
  1. .github/
  2. block-sha1/
  3. builtin/
  4. ci/
  5. compat/
  6. contrib/
  7. Documentation/
  8. ewah/
  9. git-gui/
  10. gitk-git/
  11. gitweb/
  12. mergetools/
  13. negotiator/
  14. perl/
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  22. trace2/
  23. xdiff/
  24. .cirrus.yml
  25. .clang-format
  26. .editorconfig
  27. .gitattributes
  28. .gitignore
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  30. .mailmap
  31. .travis.yml
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  50. attr.c
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  149. fetch-negotiator.c
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  151. fetch-pack.c
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  153. fmt-merge-msg.c
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  155. fsck.c
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  157. fsmonitor.c
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  159. fuzz-commit-graph.c
  160. fuzz-pack-headers.c
  161. fuzz-pack-idx.c
  162. generate-cmdlist.sh
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  164. gettext.c
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  166. git-add--interactive.perl
  167. git-archimport.perl
  168. git-bisect.sh
  169. git-compat-util.h
  170. git-cvsexportcommit.perl
  171. git-cvsimport.perl
  172. git-cvsserver.perl
  173. git-difftool--helper.sh
  174. git-filter-branch.sh
  175. git-instaweb.sh
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  177. git-merge-one-file.sh
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  181. git-p4.py
  182. git-quiltimport.sh
  183. git-rebase--preserve-merges.sh
  184. git-request-pull.sh
  185. git-send-email.perl
  186. git-sh-i18n.sh
  187. git-sh-setup.sh
  188. git-submodule.sh
  189. git-svn.perl
  190. GIT-VERSION-GEN
  191. git-web--browse.sh
  192. git.c
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  216. INSTALL
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  239. ll-merge.c
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  241. lockfile.c
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  252. match-trees.c
  253. mem-pool.c
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  255. merge-blobs.c
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  257. merge-ort-wrappers.c
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  261. merge-recursive.c
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  264. mergesort.c
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  266. midx.c
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  268. name-hash.c
  269. notes-cache.c
  270. notes-cache.h
  271. notes-merge.c
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  273. notes-utils.c
  274. notes-utils.h
  275. notes.c
  276. notes.h
  277. object-file.c
  278. object-name.c
  279. object-store.h
  280. object.c
  281. object.h
  282. oid-array.c
  283. oid-array.h
  284. oidmap.c
  285. oidmap.h
  286. oidset.c
  287. oidset.h
  288. pack-bitmap-write.c
  289. pack-bitmap.c
  290. pack-bitmap.h
  291. pack-check.c
  292. pack-objects.c
  293. pack-objects.h
  294. pack-revindex.c
  295. pack-revindex.h
  296. pack-write.c
  297. pack.h
  298. packfile.c
  299. packfile.h
  300. pager.c
  301. parallel-checkout.c
  302. parallel-checkout.h
  303. parse-options-cb.c
  304. parse-options.c
  305. parse-options.h
  306. patch-delta.c
  307. patch-ids.c
  308. patch-ids.h
  309. path.c
  310. path.h
  311. pathspec.c
  312. pathspec.h
  313. pkt-line.c
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  315. preload-index.c
  316. pretty.c
  317. pretty.h
  318. prio-queue.c
  319. prio-queue.h
  320. progress.c
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  322. promisor-remote.c
  323. promisor-remote.h
  324. prompt.c
  325. prompt.h
  326. protocol-caps.c
  327. protocol-caps.h
  328. protocol.c
  329. protocol.h
  330. prune-packed.c
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  332. quote.c
  333. quote.h
  334. range-diff.c
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  336. reachable.c
  337. reachable.h
  338. read-cache.c
  339. README.md
  340. rebase-interactive.c
  341. rebase-interactive.h
  342. rebase.c
  343. rebase.h
  344. ref-filter.c
  345. ref-filter.h
  346. reflog-walk.c
  347. reflog-walk.h
  348. refs.c
  349. refs.h
  350. refspec.c
  351. refspec.h
  352. remote-curl.c
  353. remote.c
  354. remote.h
  355. replace-object.c
  356. replace-object.h
  357. repo-settings.c
  358. repository.c
  359. repository.h
  360. rerere.c
  361. rerere.h
  362. reset.c
  363. reset.h
  364. resolve-undo.c
  365. resolve-undo.h
  366. revision.c
  367. revision.h
  368. run-command.c
  369. run-command.h
  370. SECURITY.md
  371. send-pack.c
  372. send-pack.h
  373. sequencer.c
  374. sequencer.h
  375. serve.c
  376. serve.h
  377. server-info.c
  378. setup.c
  379. sh-i18n--envsubst.c
  380. sha1dc_git.c
  381. sha1dc_git.h
  382. shallow.c
  383. shallow.h
  384. shell.c
  385. shortlog.h
  386. sideband.c
  387. sideband.h
  388. sigchain.c
  389. sigchain.h
  390. simple-ipc.h
  391. sparse-index.c
  392. sparse-index.h
  393. split-index.c
  394. split-index.h
  395. stable-qsort.c
  396. strbuf.c
  397. strbuf.h
  398. streaming.c
  399. streaming.h
  400. string-list.c
  401. string-list.h
  402. strmap.c
  403. strmap.h
  404. strvec.c
  405. strvec.h
  406. sub-process.c
  407. sub-process.h
  408. submodule-config.c
  409. submodule-config.h
  410. submodule.c
  411. submodule.h
  412. symlinks.c
  413. tag.c
  414. tag.h
  415. tar.h
  416. tempfile.c
  417. tempfile.h
  418. thread-utils.c
  419. thread-utils.h
  420. tmp-objdir.c
  421. tmp-objdir.h
  422. trace.c
  423. trace.h
  424. trace2.c
  425. trace2.h
  426. trailer.c
  427. trailer.h
  428. transport-helper.c
  429. transport-internal.h
  430. transport.c
  431. transport.h
  432. tree-diff.c
  433. tree-walk.c
  434. tree-walk.h
  435. tree.c
  436. tree.h
  437. unicode-width.h
  438. unimplemented.sh
  439. unix-socket.c
  440. unix-socket.h
  441. unix-stream-server.c
  442. unix-stream-server.h
  443. unpack-trees.c
  444. unpack-trees.h
  445. upload-pack.c
  446. upload-pack.h
  447. url.c
  448. url.h
  449. urlmatch.c
  450. urlmatch.h
  451. usage.c
  452. userdiff.c
  453. userdiff.h
  454. utf8.c
  455. utf8.h
  456. varint.c
  457. varint.h
  458. version.c
  459. version.h
  460. versioncmp.c
  461. walker.c
  462. walker.h
  463. wildmatch.c
  464. wildmatch.h
  465. worktree.c
  466. worktree.h
  467. wrap-for-bin.sh
  468. wrapper.c
  469. write-or-die.c
  470. ws.c
  471. wt-status.c
  472. wt-status.h
  473. xdiff-interface.c
  474. xdiff-interface.h
  475. zlib.c
README.md

Build status

Git - fast, scalable, distributed revision control system

Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.

See Documentation/gittutorial.txt to get started, then see Documentation/giteveryday.txt for a useful minimum set of commands, and Documentation/git-<commandname>.txt for documentation of each command. If git has been correctly installed, then the tutorial can also be read with man gittutorial or git help tutorial, and the documentation of each command with man git-<commandname> or git help <commandname>.

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The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission). To subscribe to the list, send an email with just “subscribe git” in the body to majordomo@vger.kernel.org. The mailing list archives are available at https://lore.kernel.org/git/, http://marc.info/?l=git and other archival sites.

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The name “git” was given by Linus Torvalds when he wrote the very first version. He described the tool as “the stupid content tracker” and the name as (depending on your mood):

  • random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of “get” may or may not be relevant.
  • stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
  • “global information tracker”: you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
  • “goddamn idiotic truckload of sh*t”: when it breaks