The patch titled
Subject: mm, hwpoison: fix possible use-after-free in mf_dax_kill_procs()
has been added to the -mm mm-unstable branch. Its filename is
mm-hwpoison-fix-possible-use-after-free-in-mf_dax_kill_procs.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hwpoison-fix-possible-use-after-free-in-mf_dax_kill_procs.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm, hwpoison: fix possible use-after-free in mf_dax_kill_procs()
Date: Thu, 18 Aug 2022 21:00:14 +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. Fix it by
reinitializing the to_kill list after unmap_and_kill().
Link: https://lkml.kernel.org/r/20220818130016.45313-5-linmiaohe@xxxxxxxxxx
Fixes: c36e20249571 ("mm: introduce mf_dax_kill_procs() for fsdax case")
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/memory-failure.c~mm-hwpoison-fix-possible-use-after-free-in-mf_dax_kill_procs
+++ a/mm/memory-failure.c
@@ -1658,6 +1658,8 @@ int mf_dax_kill_procs(struct address_spa
collect_procs_fsdax(page, mapping, index, &to_kill);
unmap_and_kill(&to_kill, page_to_pfn(page), mapping,
index, mf_flags);
+ /* Reinitialize to_kill list for later resuing. */
+ INIT_LIST_HEAD(&to_kill);
unlock:
dax_unlock_mapping_entry(mapping, index, cookie);
}
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-page_alloc-minor-clean-up-for-memmap_init_compound.patch
hugetlb_cgroup-remove-unneeded-nr_pages-0-check.patch
hugetlb_cgroup-hugetlbfs-use-helper-macro-sz_1kmg.patch
hugetlb_cgroup-remove-unneeded-return-value.patch
hugetlb_cgroup-use-helper-macro-numa_no_node.patch
hugetlb_cgroup-use-helper-for_each_hstate-and-hstate_index.patch
mm-hugetlb-fix-incorrect-update-of-max_huge_pages.patch
mm-hugetlb-fix-warn_onkobj-in-sysfs_create_group.patch
mm-hugetlb-fix-missing-call-to-restore_reserve_on_error.patch
mm-hugetlb_vmemmap-add-missing-smp_wmb-before-set_pte_at.patch
mm-hugetlb-fix-sysfs-group-leak-in-hugetlb_unregister_node.patch
mm-hugetlb-make-detecting-shared-pte-more-reliable.patch
mm-hwpoison-fix-page-refcnt-leaking-in-try_memory_failure_hugetlb.patch
mm-hwpoison-fix-page-refcnt-leaking-in-unpoison_memory.patch
mm-hwpoison-fix-extra-put_page-in-soft_offline_page.patch
mm-hwpoison-fix-possible-use-after-free-in-mf_dax_kill_procs.patch
mm-hwpoison-kill-procs-if-unmap-fails.patch
mm-hwpoison-avoid-trying-to-unpoison-reserved-page.patch
