Re: [PATCH v4 0/2] blk-cgroup: Fix potential UAF & flush rstat at blkgs destruction path

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On 12/14/22 22:31, Waiman Long wrote:
  v4:
   - Update comment and commit logs for both patches.

  v3:
   - Drop v2 patch 2 as it may not be needed.
   - Replace css_tryget() with percpu_ref_is_zero() in patch 1 as
     suggested by Tejun.
   - Expand comment on patch 2 to elaborate the reason for this patch.

  v2:
   - Remove unnecessary rcu_read_{lock|unlock} from
     cgroup_rstat_css_cpu_flush() in patch 3.

It was found that blkcg_destroy_blkgs() may be called with all blkcg
references gone. This may potentially cause user-after-free and so should
be fixed. The second patch flushes rstat when calling blkcg_destroy_blkgs().

Waiman Long (2):
   bdi, blk-cgroup: Fix potential UAF of blkcg
   blk-cgroup: Flush stats at blkgs destruction path

  block/blk-cgroup.c     | 23 +++++++++++++++++++++++
  include/linux/cgroup.h |  1 +
  kernel/cgroup/rstat.c  | 18 ++++++++++++++++++
  mm/backing-dev.c       |  8 ++++++--
  4 files changed, 48 insertions(+), 2 deletions(-)

Ping!

Any comments on these patches.

Thanks,
Longman





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