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powerpc/32: Add support of KASAN_VMALLOC

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Add support of KASAN_VMALLOC on PPC32.

To allow this, the early shadow covering the VMALLOC space
need to be removed once high_memory var is set and before
freeing memblock.

And the VMALLOC area need to be aligned such that boundaries
are covered by a full shadow page.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/031dec5487bde9b2181c8b3c9800e1879cf98c1a.1579024426.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy
2020-01-14 17:54:00 +00:00
committed by Michael Ellerman
parent 0f9aee0cb9
commit 3d4247fcc9
6 changed files with 49 additions and 1 deletions
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5
arch/powerpc/include/asm/book3s/32/pgtable.h
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@@ -193,7 +193,12 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
#else
#define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
#endif
#ifdef CONFIG_KASAN_VMALLOC
#define VMALLOC_END _ALIGN_DOWN(ioremap_bot, PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
#else
#define VMALLOC_END ioremap_bot
#endif
#ifndef __ASSEMBLY__
#include <linux/sched.h>