diff options
| author | Nick Hu <nickhu@andestech.com> | 2020-01-06 10:38:32 -0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-01-22 13:09:58 -0800 |
| commit | 8ad8b72721d0f07fa02dbe71f901743f9c71c8e6 (patch) | |
| tree | f7e4dfb5c72ced986c1183e9d0c830de608ea2fc /arch/riscv/kernel | |
| parent | 57ee58e39321ab4ac3f2949b90117786726cb216 (diff) | |
| download | linux-8ad8b72721d0f07fa02dbe71f901743f9c71c8e6.tar.gz | |
riscv: Add KASAN support
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>
Diffstat (limited to 'arch/riscv/kernel')
| -rw-r--r-- | arch/riscv/kernel/head.S | 3 | ||||
| -rw-r--r-- | arch/riscv/kernel/riscv_ksyms.c | 2 | ||||
| -rw-r--r-- | arch/riscv/kernel/setup.c | 5 | ||||
| -rw-r--r-- | arch/riscv/kernel/vmlinux.lds.S | 1 |
4 files changed, 11 insertions, 0 deletions
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index a4242be66966..271860fc2c3f 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -121,6 +121,9 @@ clear_bss_done: sw zero, TASK_TI_CPU(tp) la sp, init_thread_union + THREAD_SIZE +#ifdef CONFIG_KASAN + call kasan_early_init +#endif /* Start the kernel */ call parse_dtb tail start_kernel diff --git a/arch/riscv/kernel/riscv_ksyms.c b/arch/riscv/kernel/riscv_ksyms.c index 2a02b7eebee0..450492e1cb4e 100644 --- a/arch/riscv/kernel/riscv_ksyms.c +++ b/arch/riscv/kernel/riscv_ksyms.c @@ -11,3 +11,5 @@ */ EXPORT_SYMBOL(memset); EXPORT_SYMBOL(memcpy); +EXPORT_SYMBOL(__memset); +EXPORT_SYMBOL(__memcpy); diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index 365ff8420bfe..22b671dbbcf1 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -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 diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S index 12f42f96d46e..1e0193ded420 100644 --- a/arch/riscv/kernel/vmlinux.lds.S +++ b/arch/riscv/kernel/vmlinux.lds.S @@ -46,6 +46,7 @@ SECTIONS KPROBES_TEXT ENTRY_TEXT IRQENTRY_TEXT + SOFTIRQENTRY_TEXT *(.fixup) _etext = .; } |