[NativeAOT] BouncyCastle SIGARBT -1

[thefex]

Description

I am deploying native library to arm64 (in that case linux-bionic-arm64) but I suspect this is not this target specific.

Whenever I use https://www.nuget.org/packages/BouncyCastle.Cryptography library it crash during new SecureRandom()

I copy pased this classes into my project manually and I found it crash whenever Span<byte> is created with stackalloc byte array and then manipulated later on.

Is stackalloc available within nativeaot compilation?
It seems to does not work with spans.

Btw:

• I preserve all assemblies with IlLink.Descriptors so I dont think that is trimmer issue

Reproduction Steps

1. Reference BouncyCastle.Cryptography
2. Call new SecureRandom()
3. build with nativeaot compilation
4. sigarbt -1

Expected behavior

App should not crash

Actual behavior

SIGABRT -1 native crash

Regression?

No response

Known Workarounds

Dont use stackallocs with spans but… seems thats the bug

Configuration

.net 9.0.301

Other information

No response

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Tagging subscribers to this area: @agocke, @MichalStrehovsky, @jkotas
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[MichalStrehovsky]

I copy pased this classes into my project manually and I found it crash whenever Span<byte> is created with stackalloc byte array and then manipulated later on.

Can you share this project?

There are no known issues with Span<byte> and stackalloc on native AOT. This is used extensively in the BCL and ASP.NET.

[thefex]

Pasting project is not easy - as I have big marshalling layer between .net/android but the issue happens only when you export FFI that calls new SecureRandom().

I will try to provide minimal c# sample without using BouncyCastle dependency

[thefex]

Basically crash is caused by line 259 of this

https://github.com/bcgit/bc-csharp/blob/master/crypto/src/security/SecureRandom.cs

But almost every Span<byte[]> = stackalloc ..

And then some operations result in that

[thefex]

I copy pased this classes into my project manually and I found it crash whenever Span<byte> is created with stackalloc byte array and then manipulated later on.

Can you share this project?

There are no known issues with Span<byte> and stackalloc on native AOT. This is used extensively in the BCL and ASP.NET.

My bad I am so sorry but its not caused by byte / spans. Just stacktraces/crashes pointed to that.

The reason is that it use System.Security.Cryptography - RandomNumberGeneratorImplementation.
Seems nativeaot builds do not have crypto available.

Is there any way to:

• use system crypto by adding some kind of native crypto library?
• does not nativeaot build on osx try to use Native.Apple crytpo ? At least thats what rider ide suggests me when I browse code

[MichalStrehovsky]

For the linux-bionic builds of native AOT, you need to provide a libssl build: https://github.com/dotnet/runtime/blob/main/src/coreclr/nativeaot/docs/android-bionic.md#libssl-dependency

[thefex]

Yes, I cross compiled libssl libcrypto, added to android project CMakeList and suddenly it works!

Thanks, closing the issue.