Re: [PATCH] kernel: introduce prctl(PR_LOG_UACCESS)

[David Hildenbrand]

On 22.09.21 21:22, Steven Rostedt wrote:
> On Wed, 22 Sep 2021 19:46:47 +0200
> David Hildenbrand <david@xxxxxxxxxx> wrote:
>
> > > All signals except SIGKILL and SIGSTOP are masked for the interval
> > > between the prctl() and the next syscall in order to prevent handlers
> > > for intervening asynchronous signals from issuing syscalls that may
> > > cause uaccesses from the wrong syscall to be logged.
> >
> > Stupid question: can this be exploited from user space to effectively
> > disable SIGKILL for a long time ... and do we care?
>
> I first misread it too, but then caught my mistake reading it a second
> time. It says "except SIGKILL". So no, it does not disable SIGKILL.

Thanks for pointing out the obvious Steve :)

--
Thanks,

David / dhildenb