Check VM_DEAD flag of vma in page fault handler, if it is set, trigger
SIGSEGV.
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
---
arch/x86/mm/fault.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 9a84a0d..3fd2da5 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1357,6 +1357,10 @@ static inline bool smap_violation(int error_code, struct pt_regs *regs)
bad_area(regs, error_code, address);
return;
}
+ if (unlikely(vma->vm_flags & VM_DEAD)) {
+ bad_area(regs, error_code, address);
+ return;
+ }
if (error_code & X86_PF_USER) {
/*
* Accessing the stack below %sp is always a bug.
--
1.8.3.1
