From: akpm@linux-foundation.org
To: hughd@google.com, mhocko@suse.com, minchan@google.com,
minchan@kernel.org, mm-commits@vger.kernel.org,
stable@vger.kernel.org, vinmenon@codeaurora.org
Subject: + mm-do-not-free-shared-swap-slots.patch added to -mm tree
Date: Fri, 08 Nov 2019 17:55:52 -0800 [thread overview]
Message-ID: <20191109015552.5nLPQCb8U%akpm@linux-foundation.org> (raw)
The patch titled
Subject: mm/page_io.c: do not free shared swap slots
has been added to the -mm tree. Its filename is
mm-do-not-free-shared-swap-slots.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-do-not-free-shared-swap-slots.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-do-not-free-shared-swap-slots.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Vinayak Menon <vinmenon@codeaurora.org>
Subject: mm/page_io.c: do not free shared swap slots
The following race is observed due to which a processes faulting on a swap
entry, finds the page neither in swapcache nor swap. This causes zram to
give a zero filled page that gets mapped to the process, resulting in a
user space crash later.
Consider parent and child processes Pa and Pb sharing the same swap slot
with swap_count 2. Swap is on zram with SWP_SYNCHRONOUS_IO set. Virtual
address 'VA' of Pa and Pb points to the shared swap entry.
Pa Pb
fault on VA fault on VA
do_swap_page do_swap_page
lookup_swap_cache fails lookup_swap_cache fails
Pb scheduled out
swapin_readahead (deletes zram entry)
swap_free (makes swap_count 1)
Pb scheduled in
swap_readpage (swap_count == 1)
Takes SWP_SYNCHRONOUS_IO path
zram enrty absent
zram gives a zero filled page
Fix this by making sure that swap slot is freed only when swap count drops
down to one.
Link: http://lkml.kernel.org/r/1571743294-14285-1-git-send-email-vinmenon@codeaurora.org
Fixes: aa8d22a11da9 ("mm: swap: SWP_SYNCHRONOUS_IO: skip swapcache only if swapped page has no other reference")
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Suggested-by: Minchan Kim <minchan@google.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/page_io.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/page_io.c~mm-do-not-free-shared-swap-slots
+++ a/mm/page_io.c
@@ -73,6 +73,7 @@ static void swap_slot_free_notify(struct
{
struct swap_info_struct *sis;
struct gendisk *disk;
+ swp_entry_t entry;
/*
* There is no guarantee that the page is in swap cache - the software
@@ -104,11 +105,10 @@ static void swap_slot_free_notify(struct
* we again wish to reclaim it.
*/
disk = sis->bdev->bd_disk;
- if (disk->fops->swap_slot_free_notify) {
- swp_entry_t entry;
+ entry.val = page_private(page);
+ if (disk->fops->swap_slot_free_notify && __swap_count(entry) == 1) {
unsigned long offset;
- entry.val = page_private(page);
offset = swp_offset(entry);
SetPageDirty(page);
_
Patches currently in -mm which might be from vinmenon@codeaurora.org are
mm-do-not-free-shared-swap-slots.patch
reply other threads:[~2019-11-09 1:55 UTC|newest]
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