From: Atsushi Nemoto <[email protected]>
To allow a more effective copy_user_highpage() on certain architectures,
a vma argument is added to the function and cow_user_page() allowing
the implementation of these functions to check for the VM_EXEC bit.
The main part of this patch was originally written by Ralf Baechle;
Atushi Nemoto did the the debugging.
Signed-off-by: Atsushi Nemoto <[email protected]>
Signed-off-by: Ralf Baechle <[email protected]>
include/linux/highmem.h | 3 ++-
mm/hugetlb.c | 6 +++---
mm/memory.c | 10 +++++-----
3 files changed, 10 insertions(+), 9 deletions(-)
Index: upstream-alias/mm/memory.c
===================================================================
--- upstream-alias.orig/mm/memory.c
+++ upstream-alias/mm/memory.c
@@ -1441,7 +1441,7 @@ static inline pte_t maybe_mkwrite(pte_t
return pte;
}
-static inline void cow_user_page(struct page *dst, struct page *src, unsigned long va)
+static inline void cow_user_page(struct page *dst, struct page *src, unsigned long va, struct vm_area_struct *vma)
{
/*
* If the source page was a PFN mapping, we don't have
@@ -1464,9 +1464,9 @@ static inline void cow_user_page(struct
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(dst);
return;
-
+
}
- copy_user_highpage(dst, src, va);
+ copy_user_highpage(dst, src, va, vma);
}
/*
@@ -1577,7 +1577,7 @@ gotten:
new_page = alloc_page_vma(GFP_HIGHUSER, vma, address);
if (!new_page)
goto oom;
- cow_user_page(new_page, old_page, address);
+ cow_user_page(new_page, old_page, address, vma);
}
/*
@@ -2200,7 +2200,7 @@ retry:
page = alloc_page_vma(GFP_HIGHUSER, vma, address);
if (!page)
goto oom;
- copy_user_highpage(page, new_page, address);
+ copy_user_highpage(page, new_page, address, vma);
page_cache_release(new_page);
new_page = page;
anon = 1;
Index: upstream-alias/include/linux/highmem.h
===================================================================
--- upstream-alias.orig/include/linux/highmem.h
+++ upstream-alias/include/linux/highmem.h
@@ -98,7 +98,8 @@ static inline void memclear_highpage_flu
#ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE
-static inline void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr)
+static inline void copy_user_highpage(struct page *to, struct page *from,
+ unsigned long vaddr, struct vm_area_struct *vma)
{
char *vfrom, *vto;
Index: upstream-alias/mm/hugetlb.c
===================================================================
--- upstream-alias.orig/mm/hugetlb.c
+++ upstream-alias/mm/hugetlb.c
@@ -44,14 +44,14 @@ static void clear_huge_page(struct page
}
static void copy_huge_page(struct page *dst, struct page *src,
- unsigned long addr)
+ unsigned long addr, struct vm_area_struct *vma)
{
int i;
might_sleep();
for (i = 0; i < HPAGE_SIZE/PAGE_SIZE; i++) {
cond_resched();
- copy_user_highpage(dst + i, src + i, addr + i*PAGE_SIZE);
+ copy_user_highpage(dst + i, src + i, addr + i*PAGE_SIZE, vma);
}
}
@@ -442,7 +442,7 @@ static int hugetlb_cow(struct mm_struct
}
spin_unlock(&mm->page_table_lock);
- copy_huge_page(new_page, old_page, address);
+ copy_huge_page(new_page, old_page, address, vma);
spin_lock(&mm->page_table_lock);
ptep = huge_pte_offset(mm, address & HPAGE_MASK);
-
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