tree 83f309268f623840648babfdf2e64a7f5cce5167
parent 29a087fb5a0c879f0b1bc4c6b989f7b87bacdf9e
author Lasse Collin <lasse.collin@tukaani.org> 1427829574 +0300
committer Lasse Collin <lasse.collin@tukaani.org> 1427829574 +0300

xz: Add support for sandboxing with Capsicum.

The sandboxing is used conditionally as described in main.c.
This isn't optimal but it was much easier to implement than
a full sandboxing solution and it still covers the most common
use cases where xz is writing to standard output. This should
have practically no effect on performance even with small files
as fork() isn't needed.

C and locale libraries can open files as needed. This has been
fine in the past, but it's a problem with things like Capsicum.
io_sandbox_enter() tries to ensure that various locale-related
files have been loaded before cap_enter() is called, but it's
possible that there are other similar problems which haven't
been seen yet.

Currently Capsicum is available on FreeBSD 10 and later
and there is a port to Linux too.

Thanks to Loganaden Velvindron for help.