* [PATCH 2/9] UML - Page fault fixes
@ 2005-05-18 4:20 Jeff Dike
0 siblings, 0 replies; only message in thread
From: Jeff Dike @ 2005-05-18 4:20 UTC (permalink / raw)
To: akpm, torvalds; +Cc: linux-kernel, user-mode-linux-devel
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 <jdike@addtoit.com>
Index: linux-2.6.12-rc/arch/um/kernel/trap_kern.c
===================================================================
--- linux-2.6.12-rc.orig/arch/um/kernel/trap_kern.c 2005-05-17 16:34:45.000000000 -0400
+++ linux-2.6.12-rc/arch/um/kernel/trap_kern.c 2005-05-17 18:03:10.000000000 -0400
@@ -57,10 +57,11 @@ int handle_page_fault(unsigned long addr
*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)){
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2005-05-18 4:20 [PATCH 2/9] UML - Page fault fixes Jeff Dike
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