This is a note to let you know that I've just added the patch titled
mm/pagewalk.c: fix walk_page_range() access of wrong PTEs
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-pagewalk.c-fix-walk_page_range-access-of-wrong-ptes.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3017f079efd6af199b0852b5c425364513db460e Mon Sep 17 00:00:00 2001
From: Chen LinX <linx.z.chen@xxxxxxxxx>
Date: Wed, 30 Oct 2013 13:56:18 -0700
Subject: mm/pagewalk.c: fix walk_page_range() access of wrong PTEs
From: Chen LinX <linx.z.chen@xxxxxxxxx>
commit 3017f079efd6af199b0852b5c425364513db460e upstream.
When walk_page_range walk a memory map's page tables, it'll skip
VM_PFNMAP area, then variable 'next' will to assign to vma->vm_end, it
maybe larger than 'end'. In next loop, 'addr' will be larger than
'next'. Then in /proc/XXXX/pagemap file reading procedure, the 'addr'
will growing forever in pagemap_pte_range, pte_to_pagemap_entry will
access the wrong pte.
BUG: Bad page map in process procrank pte:8437526f pmd:785de067
addr:9108d000 vm_flags:00200073 anon_vma:f0d99020 mapping: (null) index:9108d
CPU: 1 PID: 4974 Comm: procrank Tainted: G B W O 3.10.1+ #1
Call Trace:
dump_stack+0x16/0x18
print_bad_pte+0x114/0x1b0
vm_normal_page+0x56/0x60
pagemap_pte_range+0x17a/0x1d0
walk_page_range+0x19e/0x2c0
pagemap_read+0x16e/0x200
vfs_read+0x84/0x150
SyS_read+0x4a/0x80
syscall_call+0x7/0xb
Signed-off-by: Liu ShuoX <shuox.liu@xxxxxxxxx>
Signed-off-by: Chen LinX <linx.z.chen@xxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Reviewed-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/pagewalk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -242,7 +242,7 @@ int walk_page_range(unsigned long addr,
if (err)
break;
pgd++;
- } while (addr = next, addr != end);
+ } while (addr = next, addr < end);
return err;
}
Patches currently in stable-queue which might be from linx.z.chen@xxxxxxxxx are
queue-3.11/mm-pagewalk.c-fix-walk_page_range-access-of-wrong-ptes.patch
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