From: "H. Peter Anvin" <hpa@zytor.com>
To: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, Jarkko Sakkinen <jarkko.sakkinen@intel.com>,
Matthew Garrett <mjg@redhat.com>,
Matt Fleming <matt.fleming@intel.com>,
Eric Northup <digitaleric@google.com>,
Dan Rosenberg <drosenberg@vsecurity.com>,
Julien Tinnes <jln@google.com>, Will Drewry <wad@chromium.org>
Subject: Re: [PATCH 3/6] x86: kaslr: return location from decompress_kernel
Date: Fri, 26 Apr 2013 14:47:30 -0700 [thread overview]
Message-ID: <517AF5F2.50404@zytor.com> (raw)
In-Reply-To: <1367003005-5560-4-git-send-email-keescook@chromium.org>
On 04/26/2013 12:03 PM, Kees Cook wrote:
> This allows decompress_kernel to return a new location for the kernel to
> be relocated to. With CONFIG_RANDOMIZE_BASE, the choose_kernel_location
> routine will select a new location to decompress the kernel, and is
> presently a no-op. The logic for bypassing this routine with "noaslr"
> on the kernel command line is handled.
>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> Documentation/kernel-parameters.txt | 4 ++++
> arch/x86/boot/compressed/Makefile | 2 +-
> arch/x86/boot/compressed/aslr.c | 21 +++++++++++++++++++++
> arch/x86/boot/compressed/cmdline.c | 2 +-
> arch/x86/boot/compressed/head_32.S | 2 +-
> arch/x86/boot/compressed/head_64.S | 2 +-
> arch/x86/boot/compressed/misc.c | 7 +++++--
> arch/x86/boot/compressed/misc.h | 22 ++++++++++++++++------
> 8 files changed, 50 insertions(+), 12 deletions(-)
> create mode 100644 arch/x86/boot/compressed/aslr.c
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 8ccbf27..eb1c62c 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1862,6 +1862,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> noapic [SMP,APIC] Tells the kernel to not make use of any
> IOAPICs that may be present in the system.
>
> + noaslr [X86]
> + Disable kernel base offset ASLR (Address Space
> + Layout Randomization) if built into the kernel.
> +
> noautogroup Disable scheduler automatic task group creation.
>
> nobats [PPC] Do not use BATs for mapping kernel lowmem
Calling it "nokaslr" might be useful to note that it is specifically
about the kernel.
-hpa
next prev parent reply other threads:[~2013-04-26 21:48 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-26 19:03 [PATCH v4 0/6] kernel ASLR Kees Cook
2013-04-26 19:03 ` [PATCH 1/6] x86: kaslr: move ELF relocation handling to C Kees Cook
2013-04-26 19:03 ` [PATCH 2/6] x86: kaslr: move CPU flags out of cpucheck Kees Cook
2013-04-26 21:47 ` H. Peter Anvin
2013-04-26 22:14 ` H. Peter Anvin
2013-04-29 17:49 ` Kees Cook
2013-04-29 17:52 ` Kees Cook
2013-04-26 19:03 ` [PATCH 3/6] x86: kaslr: return location from decompress_kernel Kees Cook
2013-04-26 21:47 ` H. Peter Anvin [this message]
2013-04-29 1:25 ` [kernel-hardening] " James Morris
2013-04-29 17:43 ` Kees Cook
2013-04-26 19:03 ` [PATCH 4/6] x86: kaslr: select random base offset Kees Cook
2013-04-26 21:50 ` H. Peter Anvin
2013-04-29 19:15 ` Kees Cook
2013-04-26 19:03 ` [PATCH 5/6] x86: kaslr: select memory region from e820 maps Kees Cook
2013-04-26 21:51 ` Yinghai Lu
2013-04-26 22:01 ` H. Peter Anvin
2013-04-26 22:01 ` Kees Cook
2013-04-26 19:03 ` [PATCH 6/6] x86: kaslr: report kernel offset on panic Kees Cook
2013-04-26 22:13 ` Borislav Petkov
2013-04-26 22:15 ` H. Peter Anvin
2013-04-26 22:19 ` Borislav Petkov
-- strict thread matches above, loose matches on Subject: below --
2013-04-25 21:54 [PATCH v3 0/6] kernel ASLR Kees Cook
2013-04-25 21:54 ` [PATCH 3/6] x86: kaslr: return location from decompress_kernel Kees Cook
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