linux-kernel - Re: [GIT PULL] x86: add brk allocator for very early allocations

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, 11 Mar 2009 12:20:10 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] x86: add brk allocator for very early allocations

Jeremy Fitzhardinge <jeremy@...p.org> writes:

> Aggregate patch below.
>
> The following changes since commit 11f5585820ae805c48f41c09bc260d0e51744792:
>  Ingo Molnar (1):
>        Merge branch 'tracing/ftrace'
>
> are available in the git repository at:
>
>  git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git push/x86/brk
>
> Jeremy Fitzhardinge (4):
>      x86: make section delimiter symbols part of their section
>      x86: add brk allocation for very, very early allocations
>      x86-32: use brk segment for allocating initial kernel pagetable
>      x86: use brk allocation for DMI

Nacked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

extend_brk is the wrong way to go.  We already have a better mechanism.
find_e820_early paired with reserve_early.

Allocating the early page tables are a very special case.   There is
a case for cleaning up that mechanism and making more comprehensible.
We should not be generalizing it, and making the kernel more fragile.

Overall I think there is a lot of good work in the patch, but taken
as a whole it seems to be moving us in the wrong direction.

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/