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https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-12-06 19:41:15 +01:00
Nick Mathewson
077b9f19a4
Since 0.2.3.1-alpha, we've supported the Linux extensions to socket(), open(), socketpair(), and accept() that enable us to create an fd and make it close-on-exec with a single syscall. This not only saves us a syscall (big deal), but makes us less vulnerable to race conditions where we open a socket and then exec before we can make it close-on-exec. But these extensions are not supported on all Linuxes: They were added between 2.6.23 or so and 2.6.28 or so. If you were to build your Tor against a recent Linux's kernel headers, and then run it with a older kernel, you would find yourselve unable to open sockets. Ouch! The solution here is that, when one of these syscalls fails with EINVAL, we should try again in the portable way. This adds an extra syscall in the case where we built with new headers and are running with old ones, but it will at least allow Tor to work. Fixes bug 5112; bugfix on 0.2.3.1-alpha.
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.
To build Tor from source:
./configure && make && make install
Home page:
https://www.torproject.org/
Download new versions:
https://www.torproject.org/download.html
Documentation, including links to installation and setup instructions:
https://www.torproject.org/documentation.html
Making applications work with Tor:
https://wiki.torproject.org/noreply/TheOnionRouter/TorifyHOWTO
Frequently Asked Questions:
https://www.torproject.org/faq.html
https://wiki.torproject.org/noreply/TheOnionRouter/TorFAQ