1. Add a separate net/ directory for the network subsystem;
2. Move some existing socket code to net/;
3. Implement sendmsg/recvmsg with OCalls;
4. Extend client/server test cases.
This demo consists of
1. An user-friendly library for getting Intel Attestation Service (IAS) report.
2. A application that uses this library to get IAS report.
This demo requires obtaining service provider certificate/ID from Intel.
This commit makes the toolchain easier to use in two folds:
1. When compiling C/C++ source files, no need to add "-fPIC -pie" flags manually;
2. When running executables generated by the Occlum toolchain on Linux, no
need to set the `LD_LIBRARY_PATH` manually.
1. Introduce the new infrastructure for ioctl support
2. Refactor the old ioctls to use the new infrastructure
3. Implement builtin ioctls (e.g., TIOCGWINSZ and TIOCSWINSZ for stdout)
4. Implement non-builtin, driver-specific ioctls (e.g., ioctls for /dev/sgx)
1. Use epoll_wait to support epoll_pwait as there is no signal mechanism
2. The timeout is fixed to zero for not waiting for any signal to come
to speed up
3. Change the test case of server_epoll to use epoll_pwait
BACKGROUND
The exit_group syscall, which is implicitly called by libc after the main function
returns, kills all threads in a thread group, even if these threads are
running, sleeping, or waiting on a futex.
PROBLEM
In normal use cases, exit_group does nothing since a well-written program
should terminate all threads before the main function returns. But when this is
not the case, exit_group can clean up the mess.
Currently, Occlum does not implement exit_group. And the Occlum PAL process
waits for all tasks (i.e., SGX threads) to finish before exiting. So without
exit_group implemented, some tasks may be still running if after the main task
exits. And this causes the Occlum PAL process to wait---forever.
WORKAROUND
To implement a real exit_group, we need signals to kill threads. But we do not
have signals, yet. So we come up with a workaround: instead of waiting all
tasks to finish in PAL, we just wait for the main task. As soon as the main
task exits, the PAL process terminates, killing the remaining tasks.
The original implementation of program loader is written under the assumption
that there are only two loadable segments per ELF, one is code, and the other
is data. But this assumption is unnecessary and proves to be wrong for an ELF
on Alpine Linux, which has two extra read-only, loadable segments for security
hardening. This commit clears the obstacle towards running unmodified
executables from Alpine Linux.
In addition to getting rid of the false assumption of two fixed loadable segments,
this commit improves the quality of the code related to program loading and
process initialization.
* 'occlum init' does not copy signing key file any more.
* 'occlum build' supports to set signing key and signing tool in args.
* 'occlum run' supports to run enclave in sgx release mode.
1. Change the port for server_poll to listen to avoid "address in use" conflict
between test/server and test/server_epoll, and add port as an argument for
test/client to send message
2. As posix-spwan may fail, change the fixed number of processes to spawn to
the number of processes successfully spawned in server_epoll
1. Now we support set App's env in Occlum.json, for example:
"env": [
"OCCLUM=yes",
"TEST=true"
]
2. Rewrite env test cases
3. Update Dockerfile to install "jq" tool
