From: Arthur Krewat <krewat@kilonet.net>
To: tuhs@minnie.tuhs.org
Subject: Re: [TUHS] PDP-11 legacy, C, and modern architectures
Date: Tue, 26 Jun 2018 18:33:37 -0400 [thread overview]
Message-ID: <769e0f86-eb90-0ec5-e744-319ab74dbd85@kilonet.net> (raw)
In-Reply-To: <117BE24B-C768-43ED-A470-40FCD1662ECD@bitblocks.com>
On 6/26/2018 6:20 PM, Bakul Shah wrote:
> it is becoming increasingly clear that
> caching (hidden memory to continue with the illusion of a simple memory
> model) itself is a potential security issue.
Then let's discuss why caching is the problem. If thread X reads memory
location A, why is thread Y able to access that cached value? Shouldn't
that cached value be associated with memory location A which I would
assume would be in a protected space that thread Y shouldn't be able to
access?
I know the nuts and bolts of how this cache exploit works, that's not
what I'm asking.
What I'm asking is, why is cache accessible in the first place? Any
cache offset should have the same memory protection as the value it
represents. Isn't this the CPU manufacturer's fault?
art k.
next prev parent reply other threads:[~2018-06-26 22:34 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-26 17:54 Nelson H. F. Beebe
2018-06-26 18:03 ` Cornelius Keck
2018-06-26 21:21 ` Nelson H. F. Beebe
2018-06-26 21:56 ` Kurt H Maier
2018-06-26 18:52 ` Ronald Natalie
2018-06-26 19:01 ` Ronald Natalie
2018-06-26 21:16 ` Arthur Krewat
2018-06-26 21:50 ` Larry McVoy
2018-06-26 21:54 ` Ronald Natalie
2018-06-26 21:59 ` Larry McVoy
2018-06-26 22:20 ` Bakul Shah
2018-06-26 22:33 ` Arthur Krewat [this message]
2018-06-26 23:53 ` Bakul Shah
2018-06-27 8:30 ` Tim Bradshaw
2018-06-26 22:33 ` Andy Kosela
2018-06-27 0:11 ` Bakul Shah
2018-06-27 6:10 ` arnold
2018-06-27 2:18 ` [TUHS] PDP-11 legacy, C, and modern architectTures Theodore Y. Ts'o
2018-06-27 2:22 ` Theodore Y. Ts'o
2018-06-28 14:36 ` Steffen Nurpmeso
2018-06-27 11:26 ` [TUHS] PDP-11 legacy, C, and modern architectures Tony Finch
2018-06-27 14:33 ` Clem Cole
2018-06-27 14:38 ` Clem Cole
2018-06-27 15:30 ` Paul Winalski
2018-06-27 16:55 ` Tim Bradshaw
2018-06-27 6:27 ` arnold
2018-06-27 16:00 ` Steve Johnson
2018-06-28 4:12 ` Bakul Shah
2018-06-28 14:15 ` Theodore Y. Ts'o
2018-06-28 14:40 ` Larry McVoy
2018-06-28 14:55 ` Perry E. Metzger
2018-06-28 14:58 ` Larry McVoy
2018-06-28 15:39 ` Tim Bradshaw
2018-06-28 16:02 ` Larry McVoy
2018-06-28 16:41 ` Tim Bradshaw
2018-06-28 16:59 ` Paul Winalski
2018-06-28 17:09 ` Larry McVoy
2018-06-29 15:32 ` tfb
2018-06-29 16:09 ` Perry E. Metzger
2018-06-29 17:51 ` Larry McVoy
2018-06-29 18:27 ` Tim Bradshaw
2018-06-29 19:02 ` Perry E. Metzger
2018-06-28 20:37 ` Perry E. Metzger
2018-06-28 15:37 ` Clem Cole
2018-06-28 20:37 ` Lawrence Stewart
2018-06-28 14:43 ` Perry E. Metzger
2018-06-28 14:56 ` Larry McVoy
2018-06-28 15:07 ` Warner Losh
2018-06-28 19:42 ` Perry E. Metzger
2018-06-28 19:55 ` Paul Winalski
2018-06-28 20:42 ` Warner Losh
2018-06-28 21:03 ` Perry E. Metzger
2018-06-28 22:29 ` Theodore Y. Ts'o
2018-06-29 0:18 ` Larry McVoy
2018-06-29 15:41 ` Perry E. Metzger
2018-06-29 18:01 ` Larry McVoy
2018-06-29 19:07 ` Perry E. Metzger
2018-06-29 5:58 ` Michael Kjörling
2018-06-28 20:52 ` Lawrence Stewart
2018-06-28 21:07 ` Perry E. Metzger
2018-06-28 16:45 ` Paul Winalski
2018-06-28 20:47 ` Perry E. Metzger
2018-06-29 15:43 ` emanuel stiebler
2018-06-29 2:02 ` Bakul Shah
2018-06-29 12:58 ` Theodore Y. Ts'o
2018-06-29 18:41 ` Perry E. Metzger
2018-06-29 1:02 Noel Chiappa
2018-06-29 1:06 Noel Chiappa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=769e0f86-eb90-0ec5-e744-319ab74dbd85@kilonet.net \
--to=krewat@kilonet.net \
--cc=tuhs@minnie.tuhs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).