Re: BUG: selinux-testsuite binder tests fail with CONFIG_ANDROID_BINDER_IPC_RUST=y

[Greg Kroah-Hartman]

On Sun, Oct 18, 2026 at 06:36:04PM +0200, Ondrej Mosnáček wrote:
> Hello Android binder maintainers,
> 
> Fedora Linux has recently enabled CONFIG_ANDROID_BINDER_IPC_RUST [1],
> which turns out to cause the binder tests of selinux-testsuite [2] to
> fail.
> 
> Minimal reproducer (no SELinux involved):
> # git clone https://github.com/SELinuxProject/selinux-testsuite
> # cd selinux-testsuite/tests/binder
> # make
> # ./init_binder.sh
> # setenforce 0   ### <-- may be needed if SELinux is enabled
> # ./manager -n &
> # sleep 1
> # ./service_provider -n &
> # sleep 1
> # ./client -n -c -r 3
> Client ioctl BINDER_WRITE_READ error: Invalid argument
> #
> 
> With only CONFIG_ANDROID_BINDER_IPC=y the last command succeeds.
> 
> The issue reproduces even on a kernel compiled from commit
> eafedbc7c050, so it seems to date back to the origin of the Rust
> implementation. I'm not sure if it's a bug in the new kernel code or
> some bug/wrong assumption in the testsuite code - can you please look
> into it?

Given that the "real" binder client works, perhaps the test is wrong and
should be fixed?

thanks,

greg k-h