[PATCH] mem: allow using ASan in multi-process mode

[Artur Paszkiewicz]

On 10/4/23 16:51, David Marchand wrote:
> - did you test with --in-memory mode? with --no-huge?

Please see v2 of the patch. I added checks for these options. They imply
no multi-process support so mapping is skipped for those cases.

> - I did not look at the patch, but I wonder if there is a risk some
> "local" ASan region (for the process heap, for example) can overlap
> with some "shared" ASan region (for shared DPDK hugepages).

I don't think it's possible unless the actual memory regions overlap.
The ASan shadow region is always at a fixed offset from the memory it
shadows. Also, this patch only makes the shadow regions shared, ASan
instrumentation already uses these regions.

> - with this work, would unit tests (that were marked failing with
> ASan) be ok now? See REGISTER_FAST_TEST macro in app/test.

I tried enabling these tests and some of them started passing with this
patch, namely:
- multiprocess_autotest
- eal_flags_c_opt_autotest
- eal_flags_main_opt_autotest
- eal_flags_a_opt_autotest

eal_flags_file_prefix_autotest still fails. The rest seem to be passing
even without the patch.

Regards,
Artur