From: Thomas Garnier <thgarnie@chromium.org>
To: kernel-hardening@lists.openwall.com
Cc: kristen@linux.intel.com, keescook@chromium.org,
Thomas Garnier <thgarnie@chromium.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Allison Randal <allison@lohutok.net>,
linux-kernel@vger.kernel.org
Subject: [PATCH v8 03/11] x86: relocate_kernel - Adapt assembly for PIE support
Date: Mon, 8 Jul 2019 10:48:56 -0700 [thread overview]
Message-ID: <20190708174913.123308-4-thgarnie@chromium.org> (raw)
In-Reply-To: <20190708174913.123308-1-thgarnie@chromium.org>
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@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
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 c51ccff5cd01..c72889b09840 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -206,7 +206,7 @@ identity_mapped:
movq %rax, %cr3
lea PAGE_SIZE(%r8), %rsp
call swap_pages
- movq $virtual_mapped, %rax
+ movabsq $virtual_mapped, %rax
pushq %rax
ret
--
2.22.0.410.gd8fdbe21b5-goog
next prev parent reply other threads:[~2019-07-08 17:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-08 17:48 [PATCH v8 00/11] x86: PIE support to extend KASLR randomization Thomas Garnier
2019-07-08 17:48 ` [PATCH v8 01/11] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2019-07-08 17:48 ` [PATCH v8 02/11] x86: Add macro to get symbol address " Thomas Garnier
2019-07-08 17:48 ` Thomas Garnier [this message]
2019-07-08 17:48 ` [PATCH v8 04/11] x86/entry/64: Adapt assembly " Thomas Garnier
2019-07-08 17:48 ` [PATCH v8 05/11] x86: pm-trace - " Thomas Garnier
2019-07-08 17:48 ` [PATCH v8 06/11] x86/CPU: " Thomas Garnier
2019-07-08 17:49 ` [PATCH v8 07/11] x86/acpi: " Thomas Garnier
2019-07-08 17:49 ` [PATCH v8 08/11] x86/boot/64: " Thomas Garnier
2019-07-08 17:49 ` [PATCH v8 09/11] x86/power/64: " Thomas Garnier
2019-07-08 17:49 ` [PATCH v8 10/11] x86/paravirt: " Thomas Garnier
2019-07-08 17:49 ` [PATCH v8 11/11] x86/alternatives: " Thomas Garnier
2019-07-30 18:01 ` [PATCH v8 00/11] x86: PIE support to extend KASLR randomization Kees Cook
2019-07-30 19:09 ` Thomas Garnier
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