From: Ingo Molnar <mingo@kernel.org>
To: Kees Cook <keescook@chromium.org>
Cc: Yinghai Lu <yinghai@kernel.org>, Baoquan He <bhe@redhat.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Matt Redfearn <matt.redfearn@imgtec.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Vivek Goyal <vgoyal@redhat.com>,
Andy Lutomirski <luto@kernel.org>,
lasse.collin@tukaani.org,
Andrew Morton <akpm@linux-foundation.org>,
Dave Young <dyoung@redhat.com>,
kernel-hardening@lists.openwall.com,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 04/21] x86, boot: Move compressed kernel to end of decompression buffer
Date: Fri, 15 Apr 2016 10:09:56 +0200 [thread overview]
Message-ID: <20160415080956.GE30715@gmail.com> (raw)
In-Reply-To: <1460672954-32567-5-git-send-email-keescook@chromium.org>
* Kees Cook <keescook@chromium.org> wrote:
> From: Yinghai Lu <yinghai@kernel.org>
>
> This change makes later calculations about where the kernel is located
> easier to reason about. To better understand this change, we must first
> clarify what VO and ZO are. They were introduced in commits by hpa:
>
> 77d1a49 x86, boot: make symbols from the main vmlinux available
> 37ba7ab x86, boot: make kernel_alignment adjustable; new bzImage fields
>
> Specifically:
>
> VO:
> - uncompressed kernel image
> - size: VO__end - VO__text ("VO_INIT_SIZE" define)
>
> ZO:
> - bootable compressed kernel image (boot/compressed/vmlinux)
> - head text + compressed kernel (VO and relocs table) + decompressor code
> - size: ZO__end - ZO_startup_32 ("ZO_INIT_SIZE" define, though see below)
>
> The INIT_SIZE definition is used to find the larger of the two image sizes:
>
> #define ZO_INIT_SIZE (ZO__end - ZO_startup_32 + ZO_z_extract_offset)
> #define VO_INIT_SIZE (VO__end - VO__text)
> #if ZO_INIT_SIZE > VO_INIT_SIZE
> #define INIT_SIZE ZO_INIT_SIZE
> #else
> #define INIT_SIZE VO_INIT_SIZE
> #endif
Please also harmonize all the prefixes, i.e. use VO__/ZO__ everywhere (rename
things where necessary), instead of this mixed up VO_/ZO_/VO__/ZO__ mess.
Thanks,
Ingo
next prev parent reply other threads:[~2016-04-15 8:10 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-14 22:28 [PATCH v5 00/21] x86, boot: KASLR cleanup and 64-bit improvements Kees Cook
2016-04-14 22:28 ` [PATCH v5 01/21] x86, KASLR: Remove unneeded boot_params argument Kees Cook
2016-04-15 7:29 ` Ingo Molnar
2016-04-15 18:55 ` Kees Cook
2016-04-14 22:28 ` [PATCH v5 02/21] x86, KASLR: Handle kernel relocation above 2G Kees Cook
2016-04-15 7:47 ` Ingo Molnar
2016-04-15 19:01 ` Kees Cook
2016-04-14 22:28 ` [PATCH v5 03/21] x86, KASLR: Drop CONFIG_RANDOMIZE_BASE_MAX_OFFSET Kees Cook
2016-04-15 8:07 ` Ingo Molnar
2016-04-15 19:12 ` Kees Cook
2016-04-16 8:42 ` Ingo Molnar
2016-04-14 22:28 ` [PATCH v5 04/21] x86, boot: Move compressed kernel to end of decompression buffer Kees Cook
2016-04-15 8:09 ` Ingo Molnar [this message]
2016-04-18 16:50 ` Kees Cook
2016-04-15 9:05 ` Ingo Molnar
2016-04-14 22:28 ` [PATCH v5 05/21] x86, boot: Calculate decompression size during boot not build Kees Cook
2016-04-15 8:12 ` Ingo Molnar
2016-04-15 19:14 ` Kees Cook
2016-04-14 22:28 ` [PATCH v5 06/21] x86, KASLR: Update description for decompressor worst case size Kees Cook
2016-04-15 16:17 ` Lasse Collin
2016-04-14 22:29 ` [PATCH v5 07/21] x86, boot: Fix run_size calculation Kees Cook
2016-04-15 8:31 ` Ingo Molnar
2016-04-15 19:26 ` Kees Cook
2016-04-16 9:00 ` Ingo Molnar
2016-04-14 22:29 ` [PATCH v5 08/21] x86, KASLR: Clean up unused code from old run_size Kees Cook
2016-04-14 22:29 ` [PATCH v5 09/21] x86, KASLR: Correctly bounds-check relocations Kees Cook
2016-04-14 22:29 ` [PATCH v5 10/21] x86, KASLR: Consolidate mem_avoid entries Kees Cook
2016-04-14 22:29 ` [PATCH v5 11/21] x86, boot: Split out kernel_ident_mapping_init Kees Cook
2016-04-14 22:29 ` [PATCH v5 12/21] x86, 64bit: Set ident_mapping for KASLR Kees Cook
2016-04-14 22:29 ` [PATCH v5 13/21] x86, boot: Report overlap failures in memcpy Kees Cook
2016-04-15 14:42 ` Lasse Collin
2016-04-15 19:28 ` Kees Cook
2016-04-14 22:29 ` [PATCH v5 14/21] x86, KASLR: Add slot_area to manage random slots Kees Cook
2016-04-14 22:29 ` [PATCH v5 15/21] x86, KASLR: Add slot_area support functions Kees Cook
2016-04-14 22:29 ` [PATCH v5 16/21] x86, KASLR: Add virtual address choosing function Kees Cook
2016-04-14 22:29 ` [PATCH v5 17/21] x86, KASLR: Clarify purpose of each get_random_long Kees Cook
2016-04-14 22:29 ` [PATCH v5 18/21] x86, KASLR: Randomize virtual address separately Kees Cook
2016-04-14 22:29 ` [PATCH v5 19/21] x86, KASLR: Add physical address randomization >4G Kees Cook
2016-04-14 22:29 ` [PATCH v5 20/21] x86, KASLR: Remove unused slot tracking code Kees Cook
2016-04-14 22:29 ` [PATCH v5 21/21] x86, KASLR: Allow randomization below load address Kees Cook
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