This is a note to let you know that I've just added the patch titled
mm/memory-failure: cast index to loff_t before shifting it
to the 6.6-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-memory-failure-cast-index-to-loff_t-before-shifting-it.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 39ebd6dce62d8cfe3864e16148927a139f11bc9a Mon Sep 17 00:00:00 2001
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Date: Mon, 18 Dec 2023 13:58:37 +0000
Subject: mm/memory-failure: cast index to loff_t before shifting it
From: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
commit 39ebd6dce62d8cfe3864e16148927a139f11bc9a upstream.
On 32-bit systems, we'll lose the top bits of index because arithmetic
will be performed in unsigned long instead of unsigned long long. This
affects files over 4GB in size.
Link: https://lkml.kernel.org/r/20231218135837.3310403-4-willy@xxxxxxxxxxxxx
Fixes: 6100e34b2526 ("mm, memory_failure: Teach memory_failure() about dev_pagemap pages")
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1705,7 +1705,7 @@ static void unmap_and_kill(struct list_h
* mapping being torn down is communicated in siginfo, see
* kill_proc()
*/
- loff_t start = (index << PAGE_SHIFT) & ~(size - 1);
+ loff_t start = ((loff_t)index << PAGE_SHIFT) & ~(size - 1);
unmap_mapping_range(mapping, start, size, 0);
}
Patches currently in stable-queue which might be from willy@xxxxxxxxxxxxx are
queue-6.6/mm-memory-failure-cast-index-to-loff_t-before-shifting-it.patch
queue-6.6/mm-filemap-avoid-buffered-read-write-race-to-read-inconsistent-data.patch
queue-6.6/mm-migrate-high-order-folios-in-swap-cache-correctly.patch
queue-6.6/maple_tree-do-not-preallocate-nodes-for-slot-stores.patch
queue-6.6/mm-memory-failure-check-the-mapcount-of-the-precise-page.patch
