The quilt patch titled
Subject: mm, hwpoison: fix possible use-after-free in mf_dax_kill_procs()
has been removed from the -mm tree. Its filename was
mm-hwpoison-fix-possible-use-after-free-in-mf_dax_kill_procs-v2.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm, hwpoison: fix possible use-after-free in mf_dax_kill_procs()
Date: Tue, 23 Aug 2022 11:23:44 +0800
After kill_procs(), tk will be freed without being removed from the
to_kill list. In the next iteration, the freed list entry in the to_kill
list will be accessed, thus leading to use-after-free issue. Adding
list_del() in kill_procs() to fix the issue.
Link: https://lkml.kernel.org/r/20220823032346.4260-5-linmiaohe@xxxxxxxxxx
Fixes: c36e20249571 ("mm: introduce mf_dax_kill_procs() for fsdax case")
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/memory-failure.c~mm-hwpoison-fix-possible-use-after-free-in-mf_dax_kill_procs-v2
+++ a/mm/memory-failure.c
@@ -413,7 +413,7 @@ static void kill_procs(struct list_head
{
struct to_kill *tk, *next;
- list_for_each_entry_safe (tk, next, to_kill, nd) {
+ list_for_each_entry_safe(tk, next, to_kill, nd) {
if (forcekill) {
/*
* In case something went wrong with munmapping
@@ -437,6 +437,7 @@ static void kill_procs(struct list_head
pr_err("%#lx: Cannot send advisory machine check signal to %s:%d\n",
pfn, tk->tsk->comm, tk->tsk->pid);
}
+ list_del(&tk->nd);
put_task_struct(tk->tsk);
kfree(tk);
}
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-hwpoison-use-clearpagehwpoison-in-memory_failure.patch
mm-hwpoison-use-__pagemovable-to-detect-non-lru-movable-pages.patch
mm-hwpoison-use-num_poisoned_pages_sub-to-decrease-num_poisoned_pages.patch
mm-hwpoison-avoid-unneeded-page_mapped_in_vma-overhead-in-collect_procs_anon.patch
mm-hwpoison-check-pagetable-explicitly-in-hwpoison_user_mappings.patch
mm-hwpoison-cleanup-some-obsolete-comments.patch
writeback-remove-unused-macro-dirty_full_scope.patch
