tree c9ec0bbdb4ea8c18ac4b79803f994a7573b9d72d
parent 3ca1d5e6320111043e19434da881065fadafa0e4
author Lasse Collin <lasse.collin@tukaani.org> 1427829574 +0300
committer Lasse Collin <lasse.collin@tukaani.org> 1482777627 +0200

xz: Add support for sandboxing with Capsicum (disabled by default).

In the v5.2 branch this feature is considered experimental
and thus disabled by default.

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.