The patch titled
Check if start address is in vma region in NOMMU function get_user_pages()
has been added to the -mm tree. Its filename is
check-if-start-address-is-in-vma-region-in-nommu-function-get_user_pages.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Check if start address is in vma region in NOMMU function get_user_pages()
From: "Sonic Zhang" <sonic.adi@xxxxxxxxx>
In NOMMU arch, if run "cat /proc/self/mem", data from physical address 0
are read. This behavior is different from MMU arch. In IA32, message
"cat: /proc/self/mem: Input/output error" is reported.
This issue is rootcaused by not validate the start address in NOMMU
function get_user_pages(). Following patch solves this issue.
Signed-off-by: Sonic Zhang <sonic.adi@xxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/nommu.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff -puN mm/nommu.c~check-if-start-address-is-in-vma-region-in-nommu-function-get_user_pages mm/nommu.c
--- a/mm/nommu.c~check-if-start-address-is-in-vma-region-in-nommu-function-get_user_pages
+++ a/mm/nommu.c
@@ -129,16 +129,20 @@ int get_user_pages(struct task_struct *t
struct page **pages, struct vm_area_struct **vmas)
{
int i;
- static struct vm_area_struct dummy_vma;
+ struct vm_area_struct *vma;
for (i = 0; i < len; i++) {
+ vma = find_vma(mm, start);
+ if(!vma)
+ return i ? : -EFAULT;
+
if (pages) {
pages[i] = virt_to_page(start);
if (pages[i])
page_cache_get(pages[i]);
}
if (vmas)
- vmas[i] = &dummy_vma;
+ vmas[i] = vma;
start += PAGE_SIZE;
}
return(i);
_
Patches currently in -mm which might be from sonic.adi@xxxxxxxxx are
check-if-start-address-is-in-vma-region-in-nommu-function-get_user_pages.patch
-
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