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Micah Elizabeth Scott 6fd5ca4914 hashx: allow hashx_compile to fail, avoid segfault without changing API 
This is a minimal portion of the fix for tor issue #40794, in which
hashx segfaults due to denial of mprotect() syscalls at runtime.

Prior to this fix, hashx makes the assumption that if the JIT is
supported on the current architecture, it will also be usable at
runtime. This isn't true if mprotect fails on linux, which it may for
various reasons: the tor built-in sandbox, the shadow simulator, or
external security software that implements a syscall filter.

The necessary error propagation was missing internally in hashx,
causing us to obliviously call into code which was never made
executable. With this fix, hashx_make() will instead fail by returning
zero.

A proper fix will require API changes so that callers can discern
between different types of failures. Zero already means that a program
couldn't be constructed, which requires a different response: choosing a
different seed, vs switching implementations. Callers would also benefit
from a way to use one context (with its already-built program) to
run in either compiled or interpreted mode.

Signed-off-by: Micah Elizabeth Scott <beth@torproject.org>
2023-05-28 19:54:50 -07:00
.gitlab/issue_templates Remove Proposal.md. 2021-02-12 20:39:48 +00:00
changes changes: Add file for ticket 40797 2023-05-25 11:12:15 -04:00
contrib Remove broken MSVC support 2022-04-27 23:09:44 -04:00
doc Merge branch 'tor-gitlab/mr/709' 2023-05-24 11:37:05 -04:00
m4 added check for compiler support of Wextra-semi 2022-11-01 15:32:43 -06:00
scripts gitlab-ci: Try enabling GPL mode so we test hs_pow 2023-05-10 07:38:29 -07:00
src hashx: allow hashx_compile to fail, avoid segfault without changing API 2023-05-28 19:54:50 -07:00
.appveyor.yml CI: Remove VS2015 AppVeyor build 2020-08-12 14:09:32 +03:00
.clang-format Add a dire warning about not reformatting the whole codebase yet. 2020-02-12 18:52:35 -05:00
.editorconfig Add .editorconfig to follow coding standards style 2018-06-17 19:24:40 -04:00
.gitignore ext: build equix and hashx using automake 2023-05-10 07:38:28 -07:00
.gitlab-ci.yml gitlab-ci: Try enabling GPL mode so we test hs_pow 2023-05-10 07:38:29 -07:00
.travis.yml rust: Remove Rust support from tree 2021-10-06 15:12:04 -04:00
acinclude.m4 m4: Change LIBS order of TOR_SEARCH_LIBRARY() 2021-01-13 09:52:10 -05:00
autogen.sh Cleanup shellcheck warnings in autogen.sh 2019-01-18 13:49:30 +02:00
ChangeLog changelog: Update with latest releases 2023-01-12 12:11:16 -05:00
CODE_OF_CONDUCT Add CODE_OF_CONDUCT file 2018-07-05 11:22:33 +03:00
configure.ac ext: build equix and hashx using automake 2023-05-10 07:38:28 -07:00
CONTRIBUTING Add CODE_OF_CONDUCT file 2018-07-05 11:22:33 +03:00
Doxyfile.in Remove last artifacts of Rust related code 2021-10-06 15:12:04 -04:00
INSTALL Remove old instructions from INSTALL 2018-07-03 16:34:52 +03:00
LICENSE Merge branch 'maint-0.3.5' into maint-0.4.4 2021-03-12 11:36:34 -05:00
Makefile.am ext: build equix and hashx using automake 2023-05-10 07:38:28 -07:00
README.md readme: Fix sentence in Releases section 2022-03-09 14:13:34 -05:00
ReleaseNotes changelog: Update with latest releases 2023-01-12 12:11:16 -05:00
warning_flags.in Try @warning_flags to avoid bloating verbose make logs 2018-12-21 10:00:23 -05:00

README.md

Tor protects your privacy on the internet by hiding the connection between your Internet address and the services you use. We believe Tor is reasonably secure, but please ensure you read the instructions and configure it properly.

Build

To build Tor from source:

./configure
make
make install

To build Tor from a just-cloned git repository:

./autogen.sh
./configure
make
make install

Releases

The tarballs, checksums and signatures can be found here: https://dist.torproject.org

  • Checksum: <tarball-name>.sha256sum
  • Signatures: <tarball-name>.sha256sum.asc

Schedule

You can find our release schedule here:

Keys that CAN sign a release

The following keys are the maintainers of this repository. One or many of these keys can sign the releases, do NOT expect them all:

Development

See our hacking documentation in doc/HACKING/.

Resources

Home page:

Download new versions:

Documentation, including links to installation and setup instructions:

Frequently Asked Questions: