aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm64/include/asm/pgtable.h
diff options
context:
space:
mode:
authorArd Biesheuvel <ard.biesheuvel@linaro.org>2016-02-16 13:52:40 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2016-02-18 18:16:44 +0000
commitf9040773b7bbbd9e98eb6184a263512a7cfc133f (patch)
tree8af5e77510e3774356f737a8674954e776001e93 /arch/arm64/include/asm/pgtable.h
parentarm64: kvm: deal with kernel symbols outside of linear mapping (diff)
downloadlinux-dev-f9040773b7bbbd9e98eb6184a263512a7cfc133f.tar.xz
linux-dev-f9040773b7bbbd9e98eb6184a263512a7cfc133f.zip
arm64: move kernel image to base of vmalloc area
This moves the module area to right before the vmalloc area, and moves the kernel image to the base of the vmalloc area. This is an intermediate step towards implementing KASLR, which allows the kernel image to be located anywhere in the vmalloc area. Since other subsystems such as hibernate may still need to refer to the kernel text or data segments via their linears addresses, both are mapped in the linear region as well. The linear alias of the text region is mapped read-only/non-executable to prevent inadvertent modification or execution. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to '')
-rw-r--r--arch/arm64/include/asm/pgtable.h10
1 files changed, 2 insertions, 8 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 87355408d448..a440f5a85d08 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -36,19 +36,13 @@
*
* VMEMAP_SIZE: allows the whole VA space to be covered by a struct page array
* (rounded up to PUD_SIZE).
- * VMALLOC_START: beginning of the kernel VA space
+ * VMALLOC_START: beginning of the kernel vmalloc space
* VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space,
* fixed mappings and modules
*/
#define VMEMMAP_SIZE ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE)
-#ifndef CONFIG_KASAN
-#define VMALLOC_START (VA_START)
-#else
-#include <asm/kasan.h>
-#define VMALLOC_START (KASAN_SHADOW_END + SZ_64K)
-#endif
-
+#define VMALLOC_START (MODULES_END)
#define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
#define vmemmap ((struct page *)(VMALLOC_END + SZ_64K))