From 13479d52c7a61a18900d7f36730b7d3b43723d97 Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Fri, 20 May 2005 13:59:08 -0700 Subject: [PATCH] [PATCH] uml: Page fault fixes Any access to a PROT_NONE page should segfault the process. A JVM seems to do this on purpose. Also, Al noticed some bogus code, which is now deleted. Signed-off-by: Jeff Dike Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/trap_kern.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c index 5fca2c61eb98..9ae2eff0d8f3 100644 --- a/arch/um/kernel/trap_kern.c +++ b/arch/um/kernel/trap_kern.c @@ -57,10 +57,11 @@ int handle_page_fault(unsigned long address, unsigned long ip, *code_out = SEGV_ACCERR; if(is_write && !(vma->vm_flags & VM_WRITE)) goto out; + + if(!(vma->vm_flags & (VM_READ | VM_EXEC))) + goto out; + page = address & PAGE_MASK; - pgd = pgd_offset(mm, page); - pud = pud_offset(pgd, page); - pmd = pmd_offset(pud, page); do { survive: switch (handle_mm_fault(mm, vma, address, is_write)){ -- 2.20.1