Disabled tests: System.IO.MemoryMappedFiles.MemoryMappedViewAccessor.ValidAccessLevelCombinations on MacCatalyst arm64

[lambdageek]

Disabled in #53197 (comment):

• System.IO.MemoryMappedFiles.Tests.MemoryMappedViewAccessorTests.ValidAccessLevelCombinations
• System.IO.MemoryMappedFiles.Tests.MemoryMappedViewStreamTests.ValidAccessLevelCombinations

Probably unrelated to #49104 (which has PlatformDetection.IsMacOsAppleSilicon applied - so maybe we need IsMacOsCatalystAppleSilicon, too), because most of the other tests are passing. Just the ones that are trying various permissions.

In particular the ReadWriteExecute permissions tests aren't likely to work (because of the W^X prohibition on silicon).

Tagging subscribers to this area: @BrzVlad
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Issue Details

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Disabled:

• System.IO.MemoryMappedFiles.Tests.MemoryMappedViewAccessorTests.ValidAccessLevelCombinations
• System.IO.MemoryMappedFiles.Tests.MemoryMappedViewStreamTests.ValidAccessLevelCombinations

Probably related to #49104 (which has PlatformDetection.IsMacOsAppleSilicon applied - so maybe we need IsMacOsCatalystAppleSilicon, too).

In particular the ReadWriteExecute permissions tests aren't likely to work (because of the W^X prohibition on silicon).

Author:	lambdageek
Assignees:	-
Labels:	area-Codegen-Interpreter-mono, os-maccatalyst, runtime-mono
Milestone:	-

[SamMonoRT]

@BrzVlad - please take a look.

[lambdageek]

IMO, the important thing here is to understand if just read-only or read-write permissions are working. The write-execute stuff is expected not to work on Apple M1

[BrzVlad]

I'm not sure yet what is the proper fix for this. Here are the conclusions though.

• when trying to do mappings with write execute permissions, which are not supposed to work, mmap returns 0 and the mapping attempt throws. We already have a catch for such exceptions on MacOS where the test is skipped, I guess we could just add another check for MacOSCatalyst and not bother anymore with it ? Other mappings work fine.
• I don't know what was originally reproduced, but locally I was getting a crash with test args [InlineData(MemoryMappedFileAccess.ReadExecute, MemoryMappedFileAccess.ReadExecute)]. The mapping was created successfully but when accessing the mapped memory the application simply crashed. After some investigation it turns out codesigning the application fixes this issue. I did this manually, are we already codesigning automatically on the CI ?

[BrzVlad]

Disabled test on maccatalyst