Implement seccomp; we use one filter for all threads.
The syscall list comes from the C daemon with syscalls added
as I hit them.
The default behaviour is to kill the process, this normally gets
audit logged.
--seccomp none disables seccomp
log Just logs violations but doesn't stop it
trap causes a signal to be be sent that can be trapped.
If you suspect you're hitting a seccomp action then you can
check the audit log; you could also switch to running with 'log'
to collect a bunch of calls to report.
To see where the syscalls are coming from use 'trap' with a debugger
or coredump to backtrace it.
This can be improved for some syscalls to restrict the parameters
to some syscalls to make them more restrictive.
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Implement support for setting up a sandbox for running the
service. The technique for this has been borrowed from virtiofsd, and
consists on switching to new PID, mount and network namespaces, and
then switching root to the directory to be shared.
Future patches will implement additional hardening features like
dropping capabilities and seccomp filters.
Signed-off-by: Sergio Lopez <slp@redhat.com>
As cloud-hypervisor/vhost crate (dragonball branch) is ready to be used,
switch vhost_rs from internal crate to the external one.
Signed-off-by: Eryu Guan <eguan@linux.alibaba.com>
This introduces setupmapping and removemapping methods to server.rs,
passthrough.rs and filesystem.rs in order to support virtiofs dax mode
inside guest.
Since we don't really want the server.rs to know that it is dealing with
vhost-user specifically, this is making it more generic by adding a new
trait which has three functions map()/unmap()/sync() corresponding to
fs_slave_{map, unmap, sync}, server.rs will take anything that implements
the trait.
Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Introduce helpers to split a virtio descriptor into its readable part on
one side, and into its writable part on the other side. This is useful
to separate the request from the reply.
This code has been ported over from crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.
Two important modifications have been applied to the original code:
- GuestMemory is replaced by GuestMemoryMmap from the vm-memory crate,
which comes with different ways of accessing the memory regions.
- VolatileSlice has different methods, which means the code has been
updated accordingly.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Add a "passthrough" file system implementation that just forwards its
requests to the appropriate system call.
This code has been ported over from crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
To be able to deal with FUSE requests, this commit introduces FUSE
definitions, copied over from the crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This new crate will be dedicated to vhost_user_fs specific code that can
be used as a library from the vhost-user-fs daemon.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
