ARM: allow __do_kernel_fault() to report execution of memory faults
Allow __do_kernel_fault() to detect the execution of memory, so we can
provide the same fault message as do_page_fault() would do. This is
required when we split the kernel address fault handling from the
main do_page_fault() code path.
Reviewed-by: Xie Yuanbin <xieyuanbin1@huawei.com>
Tested-by: Xie Yuanbin <xieyuanbin1@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index f87f353..192c8ab 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -175,6 +175,8 @@ __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
*/
if (addr < PAGE_SIZE) {
msg = "NULL pointer dereference";
+ } else if (is_permission_fault(fsr) && fsr & FSR_LNX_PF) {
+ msg = "execution of memory";
} else {
if (is_translation_fault(fsr) &&
kfence_handle_page_fault(addr, is_write_fault(fsr), regs))
