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Message-ID: <bdea1b5d70460386303e59fdc7438d9013293147.camel@marvell.com>
Date: Sun, 19 Apr 2020 05:07:41 +0000
From: Alex Belits <abelits@...vell.com>
To: "luto@...capital.net" <luto@...capital.net>
CC: "mingo@...nel.org" <mingo@...nel.org>,
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Subject: Re: [PATCH v3 04/13] task_isolation: userspace hard isolation from
kernel
On Thu, 2020-04-09 at 11:00 -0700, Andy Lutomirski wrote:
>
> >
> > Once the task has returned to userspace after issuing the prctl(),
> > if it enters the kernel again via system call, page fault, or any
> > other exception or irq, the kernel will kill it with SIGKILL.
>
> I could easily imagine myself using task isolation, but not with the
> SIGKILL semantics. SIGKILL causes data loss. Please at least let
> users choose what signal to send.
This is already done, even though the documentation is not updated.
There is even a userspace library that deals with this while
compensating for possible race conditions on isolation entry and
automatic re-entry after isolation is broken:
https://github.com/abelits/libtmc
--
Alex
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