Hi,
For the last 2 months or more, I have been quietly working on the changes
to OSv to support static executables and dynamically linked executables via
Linux dynamic linker (aka ld-linux-x86-64.so.2).
I think I am at the point where I can start submitting the changes. And I
am not sure whether I should use the traditional approach of sending the
patches to this mailing list or create pull requests on Git Hub?
I think the changes can be grouped into the following sets:
- enhance OSv dynamic linker to support statically linked executables
(this would 3-5 commits/patches)
- implement arch_prctl
- implement FS register switch on syscall and interrupt/exception
entry/exit and other places
- add all extra necessary syscalls to linux.cc
- most of the 40-50 new ones are straightforward mappings to function
calls but some like clone and other require a bit of extra implementation
-
so maybe 3-5 commits/patches
- improve vdso: mostly add logic to handle FS register switch
- scripts like loader.py and build to support statically linked
executables
- various identified related improvements/fixed - 5 -7 small patches
I have been testing my changes mostly by running various apps and unit
tests via Linux dynamic linker (like ./scripts/run.py -e
'/lib64/ld-linux-x86-64.so.2 /tests/tst-hello' where tst-hello is a
dynamically linked pie) and I got following ones to work:
- 86 unit tests (most of the ones that use standard glibc interface -
the tst-async.so and tst-app.so do not fit this bill)
- nginx
- lighhtpd
- rust-pie-example
- rust-pie-httpserver
- golang-pie-example
- golang-pie-httpserver
- iperf3
- simple executables from Linux host like ls/find/tree
- lua
- graalvm-hello, graalvm-httpserver
- sqlite
- redis
- java including http server
- node js
- python
- possibly many others
I have tested also the statically linked hello world executable (the
ld-linux-x86-64.so.2 is also statically linked). Interestingly enough the
Golang statically linked one does not work yet.
There are still some outstanding issues I have identified but I feel that
most of the changes are ready to go.
Regards,
Waldek
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