diff options
| author | Wang Kefeng <wangkefeng.wang@huawei.com> | 2021-12-03 10:26:33 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2021-12-17 12:34:38 +0100 |
| commit | 75969686ec0df23157afe24dc818d7bddb087d78 (patch) | |
| tree | 75c494737cde3df0c91fcacb3de1d67ff5a89108 /arch/arm/mm | |
| parent | ARM: 9165/1: mm: Provide is_write_fault() (diff) | |
| download | linux-75969686ec0df23157afe24dc818d7bddb087d78.tar.xz linux-75969686ec0df23157afe24dc818d7bddb087d78.zip | |
ARM: 9166/1: Support KFENCE for ARM
Add architecture specific implementation details for KFENCE and enable
KFENCE on ARM. In particular, this implements the required interface in
<asm/kfence.h>.
KFENCE requires that attributes for pages from its memory pool can
individually be set. Therefore, force the kfence pool to be mapped
at page granularity.
Testing this patch using the testcases in kfence_test.c and all passed
with or without ARM_LPAE.
Acked-by: Marco Elver <elver@google.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/mm')
| -rw-r--r-- | arch/arm/mm/fault.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index 1d41e8fad4f3..a1cebe363ed5 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -17,6 +17,7 @@ #include <linux/sched/debug.h> #include <linux/highmem.h> #include <linux/perf_event.h> +#include <linux/kfence.h> #include <asm/system_misc.h> #include <asm/system_info.h> @@ -136,10 +137,14 @@ __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr, /* * No handler, we'll have to terminate things with extreme prejudice. */ - if (addr < PAGE_SIZE) + if (addr < PAGE_SIZE) { msg = "NULL pointer dereference"; - else + } else { + if (kfence_handle_page_fault(addr, is_write_fault(fsr), regs)) + return; + msg = "paging request"; + } die_kernel_fault(msg, mm, addr, fsr, regs); } |