linux-kernel - Re: [PATCH 0/20] x86_64 Relocatable bzImage support (V4)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 07 Mar 2007 12:08:28 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	vgoyal@...ibm.com,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Reloc Kernel List <fastboot@...ts.osdl.org>,
	akpm@...ux-foundation.org, ak@...e.de, hpa@...or.com,
	magnus.damm@...il.com, lwang@...hat.com, dzickus@...hat.com,
	pavel@...e.cz, rjw@...k.pl
Subject: Re: [PATCH 0/20] x86_64 Relocatable bzImage support (V4)

Arjan van de Ven <arjan@...radead.org> writes:

> On Wed, 2007-03-07 at 12:27 +0530, Vivek Goyal wrote:
>> Hi,
>> 
>> Here is another attempt on x86_64 relocatable bzImage patches(V4). This
>> patchset makes a bzImage relocatable and same kernel binary can be loaded
>> and run from different physical addresses.
>
>
> have these patches been extensively tested with various suspend
> scenarios? (S1,S3,S4 in acpi speak or s2ram and s2disk in Linux speak)

It should be noted what broke was the non-portable constructs in the generic
suspend code.

In particular using __pa() outside of architecture code is not allowed.
Using virt_to_phys() on addresses not part of the kernel's linear mapping is
not generically supported.

text/data are not required to be part of the kernel's linear mapping.

This patchset now causes all code using these non-portable constructs to
fail on x86_64.  Which I think is a good thing so we can more easily
spot these kinds of problems.

Patches 15 and 16 appear to make the swpsuspend code rely on portable
constructs.   I will let Vivek reply to the amount of testing he has
done in this area.

Eric
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/