We had old arndale images working, but those were based on openSUSE-12.x which is now long obsolete and bad (e.g. missing security updates).
Thus we want to use a more modern u-boot and kernel, but those currently trigger a kernel panic. That needs to be investigated, tracked down and fixed but on the way we are hitting other problems, such as insufficient cross-compilation tools and a u-boot that can not do network/tftp boot.
This project is part of:
Hack Week 13
Activity
Comments
-
about 9 years ago by bmwiedemann | Reply
using setenv append " init=/bin/bash" I found a workaround: echo "install xhci_hcd /bin/true" > /etc/modprobe.d/90-blacklist-xhci.conf
-
about 9 years ago by bmwiedemann | Reply
(ontop of modules loaded in initrd) minimal reproducer is
for m in exynosdrm i2cs3c2410 clks2mps11 s5m8767 xhciplathcd asix ; do echo $m ; /sbin/modprobe $m ; done
-
about 9 years ago by bmwiedemann | Reply
still crashed with "xhci_hcd" blacklisted - but blacklisting exynosdrm helped
Similar Projects
Create DRM drivers for VESA and EFI framebuffers by tdz
Description
We already have simpledrm for firmware framebuffers. But the driver is originally for ARM boards, not PCs. It is already overloaded with code to support both use cases. At the same time it is missing possible features for VESA and EFI, such as palette modes or EDID support. We should have DRM drivers for VESA and EFI interfaces. The infrastructure exists already and initial drivers can be forked from simpledrm.
Goals
- Initially, a bare driver for VESA or EFI should be created. It can take functionality from simpledrm.
- Then we can begin to add additional features. The boot loader can provide EDID data. With VGA hardware, VESA can support paletted modes or color management. Example code exists in vesafb.
Model checking the BPF verifier by shunghsiyu
Project Description
BPF verifier plays a crucial role in securing the system (though less so now that unprivileged BPF is disabled by default in both upstream and SLES), and bugs in the verifier has lead to privilege escalation vulnerabilities in the past (e.g. CVE-2021-3490).
One way to check whether the verifer has bugs to use model checking (a formal verification technique), in other words, build a abstract model of how the verifier operates, and then see if certain condition can occur (e.g. incorrect calculation during value tracking of registers) by giving both the model and condition to a solver.
For the solver I will be using the Z3 SMT solver to do the checking since it provide a Python binding that's relatively easy to use.
Goal for this Hackweek
Learn how to use the Z3 Python binding (i.e. Z3Py) to build a model of (part of) the BPF verifier, probably the part that's related to value tracking using tristate numbers (aka tnum), and then check that the algorithm work as intended.
Resources
- Formal Methods for the Informal Engineer: Tutorial #1 - The Z3 Theorem Prover and its accompanying notebook is a great introduction into Z3
- Has a section specifically on model checking
- Software Verification and Analysis Using Z3 a great example of using Z3 for model checking
- Sound, Precise, and Fast Abstract Interpretation with Tristate Numbers - existing work that use formal verification to prove that the multiplication helper used for value tracking work as intended
- [PATCH v5 net-next 00/12] bpf: rewrite value tracking in verifier - initial patch set that adds tristate number to the verifier
Officially Become a Kernel Hacker! by m.crivellari
Description
My studies as well my spare time are dedicated to the Linux Kernel. Currently I'm focusing on interrupts on x86_64, but my interests are not restricted to one specific topic, for now.
I also "played" a little bit with kernel modules (ie lantern, a toy packet analyzer) and I've added a new syscall in order read from a task A, the memory of a task B.
Maybe this will be a good chance to...
Goals
- create my first kernel patch
Resources
- https://www.kernel.org/doc/html/latest/process/submitting-patches.html
- https://git-send-email.io/ (mentioned also in the kernel doc)
- https://javiercarrascocruz.github.io/kernel-contributor-1
Achivements
- found while working on a bug, this is the 1st patch: cifs: avoid deadlocks while updating iface [✅ has been merged]
Linux on Cavium CN23XX cards by tsbogend
Before Cavium switched to ARM64 CPUs they developed quite powerful MIPS based SOCs. The current upstream Linux kernel already supports some Octeon SOCs, but not the latest versions. Goal of this Hack Week project is to use the latest Cavium SDK to update the Linux kernel code to let it running on CN23XX network cards.
Kill DMA and DMA32 memory zones by ptesarik
Description
Provide a better allocator for DMA-capable buffers, making the DMA and DMA32 zones obsolete.
Goals
Make a PoC kernel which can boot a x86 VM and a Raspberry Pi (because early RPi4 boards have some of the weirdest DMA constraints).
Resources
- LPC2024 talk:
- video: