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.
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
1. All generated, build files are now in a separate build directory;
2. The CLI tool supports three sub-commands: init, build, and run;
3. Refactor tests to use the new tool.
* Add patch to Rust SGX SDK to enable integrity-only SgxFile
* Upgrade to the new SEFS extended with the integrity-only mode
* Use integrity-only SEFS for /bin and /lib in test
* Add the MAC of integrity-only SEFS to Occlum.json in test
* Mount multiple FS according to Occlum.json
* Check the MACs of integrity-only SEFS images
