From: Kees Cook <keescook@chromium.org>
To: Thomas Garnier <thgarnie@chromium.org>
Cc: kernel-hardening@lists.openwall.com, kristen@linux.intel.com,
Thomas Garnier <thgarnie@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 04/12] x86: relocate_kernel - Adapt assembly for PIE support
Date: Mon, 10 Jun 2019 14:33:05 -0700 [thread overview]
Message-ID: <201906101433.0A1A27960@keescook> (raw)
In-Reply-To: <20190520231948.49693-5-thgarnie@chromium.org>
On Mon, May 20, 2019 at 04:19:29PM -0700, Thomas Garnier wrote:
> From: Thomas Garnier <thgarnie@google.com>
>
> Change the assembly code to use only absolute references of symbols for the
> kernel to be PIE compatible.
>
> Position Independent Executable (PIE) support will allow to extend the
> KASLR randomization range below 0xffffffff80000000.
>
> Signed-off-by: Thomas Garnier <thgarnie@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
-Kees
> ---
> arch/x86/kernel/relocate_kernel_64.S | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
> index 11eda21eb697..3320368b6ec9 100644
> --- a/arch/x86/kernel/relocate_kernel_64.S
> +++ b/arch/x86/kernel/relocate_kernel_64.S
> @@ -208,7 +208,7 @@ identity_mapped:
> movq %rax, %cr3
> lea PAGE_SIZE(%r8), %rsp
> call swap_pages
> - movq $virtual_mapped, %rax
> + movabsq $virtual_mapped, %rax
> pushq %rax
> ret
>
> --
> 2.21.0.1020.gf2820cf01a-goog
>
--
Kees Cook
next prev parent reply other threads:[~2019-06-10 21:33 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-20 23:19 [PATCH v7 00/12] x86: PIE support to extend KASLR randomization Thomas Garnier
2019-05-20 23:19 ` [PATCH v7 01/12] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2019-05-21 4:06 ` Eric Biggers
2019-05-22 20:47 ` Thomas Garnier
2019-05-22 20:55 ` Eric Biggers
2019-05-29 15:48 ` Thomas Garnier
2019-05-20 23:19 ` [PATCH v7 02/12] x86: Use symbol name in jump table " Thomas Garnier
2019-05-20 23:23 ` Thomas Garnier
2019-05-20 23:19 ` [PATCH v7 03/12] x86: Add macro to get symbol address " Thomas Garnier
2019-05-21 3:12 ` hpa
2019-05-22 15:57 ` Thomas Garnier
2019-05-20 23:19 ` [PATCH v7 04/12] x86: relocate_kernel - Adapt assembly " Thomas Garnier
2019-06-10 21:33 ` Kees Cook [this message]
2019-05-20 23:19 ` [PATCH v7 05/12] x86/entry/64: " Thomas Garnier
2019-06-10 21:34 ` Kees Cook
2019-05-20 23:19 ` [PATCH v7 06/12] x86: pm-trace - " Thomas Garnier
2019-06-10 21:34 ` Kees Cook
2019-05-20 23:19 ` [PATCH v7 07/12] x86/CPU: " Thomas Garnier
2019-05-20 23:19 ` [PATCH v7 08/12] x86/acpi: " Thomas Garnier
2019-06-10 23:52 ` Kees Cook
2019-05-20 23:19 ` [PATCH v7 09/12] x86/boot/64: " Thomas Garnier
2019-06-10 22:26 ` Kees Cook
2019-05-20 23:19 ` [PATCH v7 10/12] x86/power/64: " Thomas Garnier
2019-06-10 23:52 ` Kees Cook
2019-05-20 23:19 ` [PATCH v7 11/12] x86/paravirt: " Thomas Garnier
2019-05-27 5:47 ` Juergen Gross
2019-05-29 15:48 ` Thomas Garnier
2019-05-20 23:19 ` [PATCH v7 12/12] x86/alternatives: " Thomas Garnier
2019-06-10 21:32 ` [PATCH v7 00/12] x86: PIE support to extend KASLR randomization Kees Cook
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