Re: Debian SID kernel doesn't boot on PowerBook 3400c
On Tue, 3 Aug 2021, Christophe Leroy wrote:
>
> Looks like the memory errors are linked to KUAP (Kernel Userspace Access
> Protection). Based on the places the problems happen, I don't think
> there are any invalid access, so there must be something wrong in the
> KUAP logic, probably linked to some interrupts happenning in kernel mode
> while the KUAP window is opened. And because is not selected by default
> on book3s/32 until 5.14, probably nobody ever tested it in a real
> environment before you.
>
> I think the issue may be linked to commit
> https://github.com/linuxppc/linux/commit/c16728835 which happened
> between 5.12 and 5.13.
The messages, "Kernel attempted to write user page (c6207c) - exploit
attempt? (uid: 0)", appear in the console logs generated by v5.13. Those
logs come from the Powerbook G3 discussion in the other thread. Could that
be the same bug?
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