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Date: Mon, 14 Aug 2017 13:54:03 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: kernel-hardening@...ts.openwall.com
Cc: linux-arm-kernel@...ts.infradead.org,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
Nicolas Pitre <nico@...aro.org>,
Russell King <linux@...linux.org.uk>,
Kees Cook <keescook@...omium.org>,
Thomas Garnier <thgarnie@...gle.com>,
Marc Zyngier <marc.zyngier@....com>,
Mark Rutland <mark.rutland@....com>,
Tony Lindgren <tony@...mide.com>,
Matt Fleming <matt@...eblueprint.co.uk>,
Dave Martin <dave.martin@....com>
Subject: [PATCH 22/30] ARM: kernel: refer to swapper_pg_dir via its symbol
The location of swapper_pg_dir is relative to the kernel, not to
PAGE_OFFSET or PHYS_OFFSET. So define the symbol relative to the
start of the kernel image, and refer to it via its name.
Cc: Russell King <linux@...linux.org.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
arch/arm/kernel/head.S | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 5d685e86148c..71bc0d037bc9 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -48,14 +48,6 @@
#define PMD_ORDER 2
#endif
- .globl swapper_pg_dir
- .equ swapper_pg_dir, KERNEL_RAM_VADDR - PG_DIR_SIZE
-
- .macro pgtbl, rd, phys
- add \rd, \phys, #TEXT_OFFSET
- sub \rd, \rd, #PG_DIR_SIZE
- .endm
-
/*
* Kernel startup entry point.
* ---------------------------
@@ -77,6 +69,9 @@
.arm
__HEAD
+ .globl swapper_pg_dir
+ .equ swapper_pg_dir, . - PG_DIR_SIZE
+
ENTRY(stext)
ARM_BE8(setend be ) @ ensure we are in BE8 mode
@@ -172,7 +167,7 @@ ENDPROC(stext)
* r4 = physical page table address
*/
__create_page_tables:
- pgtbl r4, r8 @ page table address
+ adr_l r4, swapper_pg_dir @ page table address
/*
* Clear the swapper page table
--
2.11.0
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