Sandbox methods with seccomp-BPF; except cdrom, gpgv, rsh

This reduces the number of syscalls to about 140 from about
350 or so, significantly reducing security risks.

Also change prepare-release to ignore the architecture lists
in the build dependencies when generating the build-depends
package for travis.

We might want to clean up things a bit more and/or move it
somewhere else.

1 files changed, 4 insertions, 2 deletions

diff --git a/methods/copy.cc b/methods/copy.cc
index fd4786ede..cc2fe9ea4 100644
--- a/methods/copy.cc
+++ b/methods/copy.cc
@@ -30,8 +30,10 @@ class CopyMethod : public aptMethod
    virtual bool Fetch(FetchItem *Itm) APT_OVERRIDE;
 
    public:
-
-   CopyMethod() : aptMethod("copy", "1.0",SingleInstance | SendConfig) {};
+   CopyMethod() : aptMethod("copy", "1.0", SingleInstance | SendConfig)
+   {
+      SeccompFlags = aptMethod::BASE;
+   }
 };
 
 // CopyMethod::Fetch - Fetch a file					/*{{{*/