How to build the project?

[Bonjourz]

Hi, I try to build the MPX enabled occlum on my machine. But I meet numerous error by running your script... Is there any instructions to guide users to build the project?

I build the project by running the scripts prepare.sh and download_and_build_libos.sh. When I run the download_and_build_libos.sh, the command make RELEASE=1 causes following error:

error[E0432]: unresolved import 'core::alloc::Alloc'
 --> /root/reproduce-occlum/libos/deps/rust-sgx-sdk/sgx_alloc/src/lib.rs:42:32
   |
42 | use core::alloc::{GlobalAlloc, Alloc, AllocErr, Layout};
 |                                ^^^^^ no 'Alloc' in 'alloc'

It seems the versions for the library is too old.
I am a rust novice, and cannot find solutions on the Internet. Do you know how to fix it?

I build the project in docker by running
docker run --privileged -it --device /dev/isgx occlum/occlum:0.13.1-ubuntu18.04,
and the rust version can be shown by running:

$ rustc --version
$ rustc 1.44.0-nightly (6dee5f112 2020-04-06)

[Yourens]

Maybe you can try 16.04.
The version of Rust is set in the script.
Also, about how to use this repo, you can check the "Artifact Appendix" in our paper.

[Bonjourz]

I follow the "Artifact Appendix" in your paper to build the project. I build it on Ubuntu 16.04, the kernel version is 4.15.0-29-generic. When I run the download_and_build_libos.sh, the command make submodule causes following error:

make[1]: Entering directory '/home/my-pc/reproduce-asplos20/libos/deps/sefs/sefs-fuse'
    Updating crates.io index
error: failed to select a version for the requirement `bitvec = "^0.9"`
  candidate versions found which didn't match: 0.17.4
  location searched: crates.io index
required by package `rcore-fs-sefs v0.1.0 (/home/my-pc/reproduce-asplos20/libos/deps/sefs/rcore-fs-sefs)`
    ... which is depended on by `app v1.0.0 (/home/my-pc/reproduce-asplos20/libos/deps/sefs/sefs-fuse/app)`
Makefile:142: recipe for target 'bin/app' failed
make[1]: *** [bin/app] Error 101

It seems the version of bitvec library mismatches. Then I follow the issues and apply the modifications. Then it causes following errors:

error[E0658]: use of unstable library feature 'alloc': this library is unlikely to be stabilized in its current form or name (see issue #27783)
  --> /home/my-pc/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bitvec-0.17.4/src/lib.rs:37:1
   |
37 | extern crate alloc;
   | ^^^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(alloc)] to the crate attributes to enable

Do you know how to fix it?

[wangrunji0408]

The new bitvec requires new Rust nightly toolchain, where #![feature(alloc)] is no longer needed.

Try to update nightly version to 1.36.0 or later.

[Bonjourz]

I change the version to nightly 1.46.0. Then I get following error when running the command make RELEASE=1 in download_and_build_libos.sh:

error[E0432]: unresolved import `core::alloc::Alloc`
  --> /home/my-pc/reproduce-asplos20/libos/deps/rust-sgx-sdk/sgx_alloc/src/lib.rs:42:32
   |
42 | use core::alloc::{GlobalAlloc, Alloc, AllocErr, Layout};
   |                                ^^^^^ no `Alloc` in `alloc`

error: aborting due to previous error

[Yourens]

Perhaps this could help:
rust-osdev/linked-list-allocator#20
and this:
rust-lang/rust#68529

[Bonjourz]

I change the Alloc to AllocRef, and get errors:

error[E0407]: method `alloc_zeroed` is not a member of trait `AllocRef`
  --> /home/my-pc/reproduce-asplos20/libos/deps/rust-sgx-sdk/sgx_alloc/src/lib.rs:62:5
   |
62 | /     unsafe fn alloc_zeroed(&mut self, layout: Layout)
63 | |         -> Result<NonNull<u8>, AllocErr>
64 | |     {
65 | |         NonNull::new(GlobalAlloc::alloc_zeroed(self, layout)).ok_or(AllocErr)
66 | |     }
   | |_____^ not a member of trait `AllocRef`

error[E0407]: method `realloc` is not a member of trait `AllocRef`
  --> /home/my-pc/reproduce-asplos20/libos/deps/rust-sgx-sdk/sgx_alloc/src/lib.rs:74:5
   |
74 | /     unsafe fn realloc(&mut self,
75 | |                       ptr: core::ptr::NonNull<u8>,
76 | |                       layout: Layout,
77 | |                       new_size: usize) -> Result<NonNull<u8>, AllocErr> {
78 | |         NonNull::new(GlobalAlloc::realloc(self, ptr.as_ptr(), layout, new_size)).ok_or(AllocErr)
79 | |     }
   | |_____^ not a member of trait `AllocRef`

I simply delete the implementation of alloc_zeroed() and realloc() in sgx_alloc/src/lib.rs.
After that, I get various error like:

error: cannot find derive macro `Hash` in this scope
  --> /home/my-pc/reproduce-asplos20/libos/deps/rust-sgx-sdk/sgx_tstd/src/time/mod.rs:62:5
   |
62 | #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
   |                                                       ^^^^

and

error: cannot find derive macro `Debug` in this scope
  --> /home/xinywu/workspace/gbd-dir/reproduce-asplos20/libos/deps/rust-sgx-sdk/sgx_tstd/src/sys_common/backtrace.rs:56:10
   |
95 | #[derive(Clone, Debug)]
   |                 ^^^^^

It seems that simply delete the Debug and Hash in #[derive(...)] works. But I am not sure this is the correct solution...