From: Richard Henderson <richard.henderson@linaro.org>
To: David Hildenbrand <david@redhat.com>, qemu-devel@nongnu.org
Cc: Florian Weimer <fweimer@redhat.com>,
Thomas Huth <thuth@redhat.com>, Cornelia Huck <cohuck@redhat.com>,
Stefano Brivio <sbrivio@redhat.com>,
qemu-s390x@nongnu.org, Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH v2 04/28] s390x/tcg: MVCL: Process max 2k bytes at a time
Date: Wed, 11 Sep 2019 11:07:14 -0400 [thread overview]
Message-ID: <905250c7-b249-6812-391c-408af69d9523@linaro.org> (raw)
In-Reply-To: <7788b1b6-fbf0-3370-5563-1da4f7124999@linaro.org>
On 9/11/19 10:52 AM, Richard Henderson wrote:
> The code within Hercules breaks the action at every 2k address boundary -- for
> both src and dest. That's the only way that actually makes sense to me, as
> otherwise we end up allowing userspace to read/write into a page without
> permission. Which is a security hole.
Also, doesn't "2k" come from the old esa/360 page size?
Which means that we could break at 4k pages instead of 2k now
and the program wouldn't really be able to tell the difference.
r~
next prev parent reply other threads:[~2019-09-11 15:17 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-06 7:57 [Qemu-devel] [PATCH v2 00/28] s390x/tcg: mem_helper: Fault-safe handling David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 01/28] s390x/tcg: Reset exception_index to -1 instead of 0 David Hildenbrand
2019-09-11 14:38 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 02/28] s390x/tcg: MVCL: Zero out unused bits of address David Hildenbrand
2019-09-11 14:40 ` Richard Henderson
2019-09-11 16:10 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 03/28] s390x/tcg: MVCL: Detect destructive overlaps David Hildenbrand
2019-09-11 14:42 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 04/28] s390x/tcg: MVCL: Process max 2k bytes at a time David Hildenbrand
2019-09-11 14:52 ` Richard Henderson
2019-09-11 15:07 ` Richard Henderson [this message]
2019-09-11 16:12 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 05/28] s390x/tcg: MVC: Increment the length once David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 06/28] s390x/tcg: MVC: Use is_destructive_overlap() David Hildenbrand
2019-09-11 14:54 ` Richard Henderson
2019-09-11 16:13 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 07/28] s390x/tcg: MVPG: Check for specification exceptions David Hildenbrand
2019-09-11 14:57 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 08/28] s390x/tcg: MVPG: Properly wrap the addresses David Hildenbrand
2019-09-11 14:58 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 09/28] s390x/tcg: MVCLU/MVCLE: Process max 4k bytes at a time David Hildenbrand
2019-09-11 15:05 ` Richard Henderson
2019-09-11 16:14 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 10/28] s390x/tcg: MVCS/MVCP: Check for special operation exceptions David Hildenbrand
2019-09-11 15:08 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 11/28] s390x/tcg: MVCS/MVCP: Properly wrap the length David Hildenbrand
2019-09-11 15:11 ` Richard Henderson
2019-09-11 16:15 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 12/28] s390x/tcg: MVST: Check for specification exceptions David Hildenbrand
2019-09-11 15:14 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 13/28] s390x/tcg: MVST: Fix storing back the addresses to registers David Hildenbrand
2019-09-11 15:18 ` Richard Henderson
2019-09-11 16:15 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 14/28] s390x/tcg: Always use MMU_USER_IDX for CONFIG_USER_ONLY David Hildenbrand
2019-09-11 15:19 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 15/28] s390x/tcg: Fault-safe memset David Hildenbrand
2019-09-11 15:29 ` Richard Henderson
2019-09-11 16:18 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 16/28] s390x/tcg: Fault-safe memmove David Hildenbrand
2019-09-11 21:11 ` Richard Henderson
2019-09-11 22:03 ` Richard Henderson
2019-09-13 12:37 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 17/28] s390x/tcg: MVCS/MVCP: Use access_memmove_idx() David Hildenbrand
2019-09-11 21:13 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 18/28] s390x/tcg: MVC: Fault-safe handling on destructive overlaps David Hildenbrand
2019-09-11 21:20 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 19/28] s390x/tcg: MVCLU: Fault-safe handling David Hildenbrand
2019-09-11 21:24 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 20/28] s390x/tcg: OC: " David Hildenbrand
2019-09-11 21:26 ` Richard Henderson
2019-09-16 12:01 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 21/28] s390x/tcg: XC: " David Hildenbrand
2019-09-11 21:29 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 22/28] s390x/tcg: NC: " David Hildenbrand
2019-09-11 21:32 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 23/28] s390x/tcg: MVCIN: " David Hildenbrand
2019-09-11 21:35 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 24/28] s390x/tcg: MVN: " David Hildenbrand
2019-09-11 21:37 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 25/28] s390x/tcg: MVZ: " David Hildenbrand
2019-09-11 21:38 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 26/28] s390x/tcg: MVST: " David Hildenbrand
2019-09-11 21:52 ` Richard Henderson
2019-09-16 10:39 ` David Hildenbrand
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 27/28] s390x/tcg: MVO: " David Hildenbrand
2019-09-11 22:09 ` Richard Henderson
2019-09-06 7:57 ` [Qemu-devel] [PATCH v2 28/28] tests/tcg: target/s390x: Test MVO David Hildenbrand
2019-09-11 11:11 ` [Qemu-devel] [qemu-s390x] [PATCH v2 00/28] s390x/tcg: mem_helper: Fault-safe handling David Hildenbrand
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