The patch titled
Subject: kasan-prevent-cpu_quarantine-corruption-when-cpu-offline-and-cache-shrink-occur-at-same-time-fix
has been added to the -mm tree. Its filename is
kasan-prevent-cpu_quarantine-corruption-when-cpu-offline-and-cache-shrink-occur-at-same-time-fix.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kasan-prevent-cpu_quarantine-corruption-when-cpu-offline-and-cache-shrink-occur-at-same-time-fix.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kasan-prevent-cpu_quarantine-corruption-when-cpu-offline-and-cache-shrink-occur-at-same-time-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: kasan-prevent-cpu_quarantine-corruption-when-cpu-offline-and-cache-shrink-occur-at-same-time-fix
add comment, per Zqiang
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Zqiang <qiang1.zhang@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kasan/quarantine.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/mm/kasan/quarantine.c~kasan-prevent-cpu_quarantine-corruption-when-cpu-offline-and-cache-shrink-occur-at-same-time-fix
+++ a/mm/kasan/quarantine.c
@@ -315,6 +315,11 @@ static void per_cpu_remove_cache(void *a
struct qlist_head *q;
q = this_cpu_ptr(&cpu_quarantine);
+ /*
+ * Ensure the ordering between the writing to q->offline and
+ * per_cpu_remove_cache. Prevent cpu_quarantine from being corrupted
+ * by interrupt.
+ */
if (READ_ONCE(q->offline))
return;
qlist_move_cache(q, &to_free, cache);
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
kasan-prevent-cpu_quarantine-corruption-when-cpu-offline-and-cache-shrink-occur-at-same-time-fix.patch
mm.patch
mm-create-new-mm-swaph-header-file-fix.patch
mm-check-against-orig_pte-for-finish_fault-fix-checkpatch-fixes.patch
mm-hugetlb-only-drop-uffd-wp-special-pte-if-required-fix-fix.patch
mm-vmscan-fix-comment-for-current_may_throttle-fix.patch
ksm-count-ksm-merging-pages-for-each-process-fix.patch
mm-memory_hotplug-refactor-hotadd_init_pgdat-and-try_online_node-checkpatch-fixes.patch
proc-fix-dentry-inode-overinstantiating-under-proc-pid-net-checkpatch-fixes.patch
fs-proc-kcorec-remove-check-of-list-iterator-against-head-past-the-loop-body-fix.patch
add-fat-messages-to-printk-index-checkpatch-fixes.patch
linux-next-rejects.patch
linux-next-git-rejects.patch
mm-oom_killc-fix-vm_oom_kill_table-ifdeffery.patch
