- Devel - lists.sel4.systems

[RFC] Support CHERI/Morello in seL4
by Hesham Almatary 13 Nov '23

13 Nov '23

Hello, I have started working on porting seL4 to CHERI/Morello. Part of that, and as a first step, I submitted an RFC [1] as we aim to ideally upstream this work to make it reusable by others and allow collaborations. Any feedback or comments will be appreciated, happy to discuss further. For those who don't know me, I have worked on seL4 at the TS group from 2016-2018, during which I added FPU and SMP support to the Armv7 32-bit port, and added the RISC-V port. I then did my PhD on "CHERI compartmentalisation for embedded systems." [1] https://sel4.atlassian.net/browse/RFC-15 Regards, Hesham

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Reminder seL4 developer hangout
by Birgit Brecknell 12 Nov '23

12 Nov '23

Hi all A friendly reminder that the seL4 developer hangout is on again this week: * Sydney: Wed, Nov 15, 5pm For your time zone, please see the calendar: https://sel4.systems/contact/ Zoom link: https://unsw.zoom.us/j/82640784431 cheers Birg --- Birgit Brecknell Project Coordinator, seL4 Foundation birgit(a)sel4.systems<mailto:birgit@sel4.systems> birgit.brecknell(a)unsw.edu.au<mailto:birgit.brecknell@unsw.edu.au> Mon 9am-5pm Wed 2pm-5pm Fri 9am-5pm

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Where are the interrupts disabled in the kernel mode?
by chenpingyuan＠xiaomi.com 09 Nov '23

09 Nov '23

Hi experts, The sel4 whitepaper says "seL4, like most members of the L4 microkernel family, executes with interrupts disabled while in kernel mode.". But I didn't find the code which disabled interrupts when entering kernel mode, for example, when a syscall is triggered. Can anybody help to point out? Thanks.

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Reminder seL4 developer hangout
by Birgit Brecknell 29 Oct '23

29 Oct '23

Hi all A friendly reminder that the seL4 developer hangout is on again this week: * Sydney: Wed, Nov 1, 8am For your time zone, please see the calendar: https://sel4.systems/contact/ Zoom link: https://unsw.zoom.us/j/82640784431 cheers Birg --- Birgit Brecknell Project Coordinator, seL4 Foundation birgit(a)sel4.systems<mailto:birgit@sel4.systems> birgit.brecknell(a)unsw.edu.au<mailto:birgit.brecknell@unsw.edu.au> Mon 9am-5pm Wed 2pm-5pm Fri 9am-5pm

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Camkes-vm-linux tutorial
by felicianidaniele＠gmail.com 26 Oct '23

26 Oct '23

Hi, I modified the vm_tutorial.camkes file to obtain two VMs. It works but I would like to see the two virtual machines on two different consoles. Is it possible? Thanks Daniele

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vm-minimal on raspberry pi4
by felicianidaniele＠gmail.com 18 Oct '23

18 Oct '23

Hi everyone, I would like to run vm-minimal and vm-multi (camkes-vm-manifest repo) on raspberry pi 4 4gb RAM. Can someone help me? Thanks Daniele

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Running Sel4 on Rasberry pi 4 4 gb RAM
by felicianidaniele＠gmail.com 18 Oct '23

18 Oct '23

Hello, i'm trying to upload seL4 ( seL4test-driver-image-bcm2711 image) on raspberry pi 4 but i'm encountering two different errors: 1. If I follow the website procedure and upload the sel4test image into the address 0x10000000 the error is : “Reading file would overwrite reserved memory” 2. If I try to upload the image into 0x1000000 I read the following error: “sel4 failed assertion ‘isSchedulable(candidate)’ at /kernel/thread.c can someone help me? Thanks Daniele

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Help with navigating the l4v repository
by Typaldos, Athanasios 18 Oct '23

18 Oct '23

Hello, I am from Lin Zhong’s group at Yale University and I am currently looking at the seL4 specifications and proofs. I am interested in finding the invariants at the abstract level regarding the capability management (CNode and CSpace). I would need some help with navigating the repository, because I am relatively new to interactive theorem proving in general. - I think what I am looking for is in the `l4v/proof/invariant-abstract` directory inside the `{CNode, CSpace}*_AI.thy` files. Is this correct ? - How can I distinguish between helper lemmas and the invariants that you state for example in your paper: SeL4: formal verification of an OS kernel<https://dl.acm.org/doi/10.1145/1629575.1629596> ? - Is there any textual artifact that lists the invariants in prose that could help me ? - Can you clarify me the relationship between the specifications in `l4v/spec/abstract` and the proofs in `l4v/proof/invariant-abstract` ? According to my understanding, the abstract specification defines the system in the abstract level, whereas the proofs use these definitions from the specifications to prove properties and invariants about them. So, the invariants are the statements that the proofs prove. Am I on the right track ? Thank you for your help, Thanasis Typaldos

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Reminder seL4 developer hangout
by Birgit Brecknell 15 Oct '23

15 Oct '23

Hi all A friendly reminder that the seL4 developer hangout is on again this week: * Sydney: Wed, Oct 18, 5pm For your time zone, please see the calendar: https://sel4.systems/contact/ Zoom link: https://unsw.zoom.us/j/82640784431 cheers Birg --- Birgit Brecknell Project Coordinator, seL4 Foundation birgit(a)sel4.systems<mailto:birgit@sel4.systems> birgit.brecknell(a)unsw.edu.au<mailto:birgit.brecknell@unsw.edu.au> Mon 9am-5pm Wed 2pm-5pm Fri 9am-5pm

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Incorrect dtb in the Microkit tutorial
by Luke Hart 08 Oct '23

08 Oct '23

Hello, It seems that the linux.dtb file supplied with the tutorial code is not correct and does not allocate enough memory for the initrd. The symptoms this issue caused when attempting to run part4 was that the libresolv.so.2 could not be opened and the vmm panic'ed. The linux.dtb supplied in the 'solution' folder in the git repository has 'initrd-end' set to a larger value and this version does work. Thanks, Luke

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