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riscv: Add KASAN support

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This patch ports the feature Kernel Address SANitizer (KASAN).

Note: The start address of shadow memory is at the beginning of kernel
space, which is 2^64 - (2^39 / 2) in SV39. The size of the kernel space is
2^38 bytes so the size of shadow memory should be 2^38 / 8. Thus, the
shadow memory would not overlap with the fixmap area.

There are currently two limitations in this port,

1. RV64 only: KASAN need large address space for extra shadow memory
region.

2. KASAN can't debug the modules since the modules are allocated in VMALLOC
area. We mapped the shadow memory, which corresponding to VMALLOC area, to
the kasan_early_shadow_page because we don't have enough physical space for
all the shadow memory corresponding to VMALLOC area.

Signed-off-by: Nick Hu <nickhu@andestech.com>
Reported-by: Greentime Hu <green.hu@gmail.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Nick Hu 2020-01-06 10:38:32 -08:00 • committed by Palmer Dabbelt
parent 57ee58e393
commit 8ad8b72721
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12 changed files with 169 additions and 4 deletions
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5
arch/riscv/kernel/setup.c
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@ -24,6 +24,7 @@
#include <asm/smp.h>
#include <asm/tlbflush.h>
#include <asm/thread_info.h>
#include <asm/kasan.h>
#include "head.h"
@ -74,6 +75,10 @@ void __init setup_arch(char **cmdline_p)
swiotlb_init(1);
#endif
#ifdef CONFIG_KASAN
kasan_init();
#endif
#ifdef CONFIG_SMP
setup_smp();
#endif