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powerpc/32: prepare shadow area for KASAN 

This patch prepares a shadow area for KASAN.

The shadow area will be at the top of the kernel virtual
memory space above the fixmap area and will occupy one
eighth of the total kernel virtual memory space.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-04-26 16:23:32 +00:00 committed by Michael Ellerman
parent a67beca077
commit b4abe38fd6
5 changed files with 38 additions and 0 deletions
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5
arch/powerpc/Kconfig.debug
View File

@ -366,3 +366,8 @@ config PPC_FAST_ENDIAN_SWITCH
depends on DEBUG_KERNEL && PPC_BOOK3S_64
help
If you're unsure what this is, say N.
config KASAN_SHADOW_OFFSET
hex
depends on KASAN
default 0xe0000000

5
arch/powerpc/include/asm/fixmap.h
View File

@ -22,7 +22,12 @@
#include <asm/kmap_types.h>
#endif
#ifdef CONFIG_KASAN
#include <asm/kasan.h>
#define FIXADDR_TOP (KASAN_SHADOW_START - PAGE_SIZE)
#else
#define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE))
#endif
/*
* Here we define all the compile-time 'special' virtual

16
arch/powerpc/include/asm/kasan.h
View File

@ -12,4 +12,20 @@
#define EXPORT_SYMBOL_KASAN(fn)
#endif
#ifndef __ASSEMBLY__
#include <asm/page.h>
#define KASAN_SHADOW_SCALE_SHIFT 3
#define KASAN_SHADOW_START (KASAN_SHADOW_OFFSET + \
(PAGE_OFFSET >> KASAN_SHADOW_SCALE_SHIFT))
#define KASAN_SHADOW_OFFSET ASM_CONST(CONFIG_KASAN_SHADOW_OFFSET)
#define KASAN_SHADOW_END 0UL
#define KASAN_SHADOW_SIZE (KASAN_SHADOW_END - KASAN_SHADOW_START)
#endif /* __ASSEMBLY */
#endif

4
arch/powerpc/mm/mem.c
View File

@ -310,6 +310,10 @@ void __init mem_init(void)
mem_init_print_info(NULL);
#ifdef CONFIG_PPC32
pr_info("Kernel virtual memory layout:\n");
#ifdef CONFIG_KASAN
pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
KASAN_SHADOW_START, KASAN_SHADOW_END);
#endif
pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
#ifdef CONFIG_HIGHMEM
pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",

8
arch/powerpc/mm/ptdump/ptdump.c
View File

@ -100,6 +100,10 @@ static struct addr_marker address_markers[] = {
#endif
{ 0, "Fixmap start" },
{ 0, "Fixmap end" },
#endif
#ifdef CONFIG_KASAN
{ 0, "kasan shadow mem start" },
{ 0, "kasan shadow mem end" },
#endif
{ -1, NULL },
};
@ -323,6 +327,10 @@ static void populate_markers(void)
#endif
address_markers[i++].start_address = FIXADDR_START;
address_markers[i++].start_address = FIXADDR_TOP;
#ifdef CONFIG_KASAN
address_markers[i++].start_address = KASAN_SHADOW_START;
address_markers[i++].start_address = KASAN_SHADOW_END;
#endif
#endif /* CONFIG_PPC64 */
}