Cannot run kunit tests

[Ayush1325]

Describe the bug

Currentlly, it is not possible to run Kunit tests while doing kernel development inside toolbox.

This seems to be related to /dev/shm. Here is the output when trying to run the compiled um architecture kernel:

❯ ./.kunit/linux
Core dump limits :
        soft - NONE
        hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation for ptrace...OK
Checking environment variables for a tempdir...none found
Checking if /dev/shm is on tmpfs...OK
Checking PROT_EXEC mmap in /dev/shm...Operation not permitted
/dev/shm must be not mounted noexec

Steps how to reproduce the behaviour

1. Clone Linux kernel https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
2. Build kunit tests:

./tools/testing/kunit/kunit.py config
./tools/testing/kunit/kunit.py exec

3. Execute kernel executable:

./.kunit/linux

I am running the executable directly since that will show the error properly. Using kunit.py run will just show unhelpful error that KTAP output was missing.

Output of toolbox --version (v0.0.90+)
e.g., toolbox version 0.0.90

Toolbx package info (rpm -q toolbox)

toolbox version 0.0.99.6

Output of podman version
e.g.,

Client:       Podman Engine
Version:      5.2.3
API Version:  5.2.3
Go Version:   go1.22.7
Built:        Tue Sep 24 05:30:00 2024
OS/Arch:      linux/amd64

Podman package info (rpm -q podman)

podman-5.2.3-1.fc40.x86_64

Info about your OS

Fedora Sway Atomic 40