[PATCH] Pass vma argument to copy_user_highpage().
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 <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/memory.c b/mm/memory.c
index bf61002..c00bac6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1441,7 +1441,7 @@
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 @@
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 @@
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 @@
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;