Patchwork [3.5.y.z,extended,stable] Patch "s390/gup: add missing TASK_SIZE check to" has been added to staging queue

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Submitter Herton Ronaldo Krzesinski
Date Dec. 7, 2012, 4:05 p.m.
Message ID <1354896326-22522-1-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/204552/
State New
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Comments

Herton Ronaldo Krzesinski - Dec. 7, 2012, 4:05 p.m.
This is a note to let you know that I have just added a patch titled

    s390/gup: add missing TASK_SIZE check to

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

From 650c1926b6444071f3a2b42805415f8c59d11d12 Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 22 Oct 2012 15:49:02 +0200
Subject: [PATCH] s390/gup: add missing TASK_SIZE check to
 get_user_pages_fast()

commit d55c4c613fc4d4ad2ba0fc6fa2b57176d420f7e4 upstream.

When walking page tables we need to make sure that everything
is within bounds of the ASCE limit of the task's address space.
Otherwise we might calculate e.g. a pud pointer which is not
within a pud and dereference it.
So check against TASK_SIZE (which is the ASCE limit) before
walking page tables.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 arch/s390/mm/gup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--
1.7.9.5

Patch

diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index 65cb06e..4ccf9f5 100644
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -183,7 +183,7 @@  int get_user_pages_fast(unsigned long start, int nr_pages, int write,
 	addr = start;
 	len = (unsigned long) nr_pages << PAGE_SHIFT;
 	end = start + len;
-	if (end < start)
+	if ((end < start) || (end > TASK_SIZE))
 		goto slow_irqon;

 	/*