From: Dmitry Vyukov <dvyukov@google.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Patricia Alfonso <trishalfonso@google.com>,
Jeff Dike <jdike@addtoit.com>,
Richard Weinberger <richard@nod.at>,
anton.ivanov@cambridgegreys.com,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Brendan Higgins <brendanhiggins@google.com>,
David Gow <davidgow@google.com>,
linux-um@lists.infradead.org, LKML <linux-kernel@vger.kernel.org>,
kasan-dev <kasan-dev@googlegroups.com>
Subject: Re: [PATCH] UML: add support for KASAN under x86_64
Date: Mon, 30 Mar 2020 10:38:50 +0200 [thread overview]
Message-ID: <CACT4Y+YhwJK+F7Y7NaNpAwwWR-yZMfNevNp_gcBoZ+uMJRgsSA@mail.gmail.com> (raw)
In-Reply-To: <2cee72779294550a3ad143146283745b5cccb5fc.camel@sipsolutions.net>
On Mon, Mar 30, 2020 at 9:44 AM Johannes Berg <johannes@sipsolutions.net> wrote:
>
> On Fri, 2020-03-20 at 16:18 +0100, Dmitry Vyukov wrote:
> >
> > > Wait ... Now you say 0x7fbfffc000, but that is almost fine? I think you
> > > confused the values - because I see, on userspace, the following:
> >
> > Oh, sorry, I copy-pasted wrong number. I meant 0x7fff8000.
>
> Right, ok.
>
> > Then I would expect 0x1000 0000 0000 to work, but you say it doesn't...
>
> So it just occurred to me - as I was mentioning this whole thing to
> Richard - that there's probably somewhere some check about whether some
> space is userspace or not.
>
> I'm beginning to think that we shouldn't just map this outside of the
> kernel memory system, but properly treat it as part of the memory that's
> inside. And also use KASAN_VMALLOC.
>
> We can probably still have it at 0x7fff8000, just need to make sure we
> actually map it? I tried with vm_area_add_early() but it didn't really
> work once you have vmalloc() stuff...
But we do mmap it, no? See kasan_init() -> kasan_map_memory() -> mmap.
next prev parent reply other threads:[~2020-03-30 8:39 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 0:46 [PATCH] UML: add support for KASAN under x86_64 Patricia Alfonso
2020-02-26 1:19 ` Brendan Higgins
2020-02-26 15:24 ` Dmitry Vyukov
2020-03-06 0:03 ` Patricia Alfonso
2020-03-11 10:32 ` Johannes Berg
2020-03-11 10:46 ` Dmitry Vyukov
2020-03-11 11:18 ` Johannes Berg
2020-03-11 11:40 ` Johannes Berg
2020-03-11 17:34 ` Dmitry Vyukov
2020-03-20 13:39 ` Johannes Berg
2020-03-20 15:18 ` Dmitry Vyukov
2020-03-30 7:43 ` Johannes Berg
2020-03-30 8:38 ` Dmitry Vyukov [this message]
2020-03-30 8:41 ` Johannes Berg
2020-03-31 6:14 ` David Gow
2020-03-31 7:43 ` Johannes Berg
2020-03-31 16:39 ` Patricia Alfonso
2020-03-31 16:54 ` Richard Weinberger
2020-03-11 22:32 ` Patricia Alfonso
2020-03-11 22:44 ` Johannes Berg
2022-05-24 10:34 ` Vincent Whitchurch
2022-05-24 10:45 ` Johannes Berg
2022-05-24 19:35 ` David Gow
2022-05-25 11:17 ` Vincent Whitchurch
2022-05-26 1:01 ` [RFC PATCH v3] " David Gow
2022-05-26 9:29 ` Johannes Berg
2022-05-27 5:31 ` Dmitry Vyukov
2022-05-27 7:32 ` Johannes Berg
2022-05-27 10:36 ` Johannes Berg
2022-05-27 13:05 ` Johannes Berg
2022-05-27 13:09 ` Dmitry Vyukov
2022-05-27 13:15 ` Johannes Berg
2022-05-27 13:18 ` Dmitry Vyukov
2022-05-27 13:27 ` Johannes Berg
2022-05-27 13:52 ` Dmitry Vyukov
2022-05-27 14:27 ` Johannes Berg
2022-05-27 15:46 ` Dmitry Vyukov
2020-03-29 19:06 ` [PATCH] " Richard Weinberger
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