From: Waiman Long <longman@redhat.com>
To: Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
Josef Bacik <josef@toxicpanda.com>,
Zefan Li <lizefan.x@bytedance.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: cgroups@vger.kernel.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"Michal Koutný" <mkoutny@suse.com>,
"Dennis Zhou (Facebook)" <dennisszhou@gmail.com>,
"Waiman Long" <longman@redhat.com>
Subject: [PATCH-block v2 0/3] blk-cgroup: Fix potential UAF & miscellaneous cleanup
Date: Sun, 11 Dec 2022 17:20:55 -0500 [thread overview]
Message-ID: <20221211222058.2946830-1-longman@redhat.com> (raw)
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 last 2 patches are miscellaneous cleanups of
commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()").
Waiman Long (3):
bdi, blk-cgroup: Fix potential UAF of blkcg
blk-cgroup: Don't flush a blkg if destroyed
blk-cgroup: Flush stats at blkgs destruction path
block/blk-cgroup.c | 26 ++++++++++++++++++++++++++
include/linux/cgroup.h | 1 +
kernel/cgroup/rstat.c | 18 ++++++++++++++++++
mm/backing-dev.c | 8 ++++++--
4 files changed, 51 insertions(+), 2 deletions(-)
--
2.31.1
next reply other threads:[~2022-12-11 22:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-11 22:20 Waiman Long [this message]
2022-12-11 22:20 ` [PATCH-block v2 1/3] bdi, blk-cgroup: Fix potential UAF of blkcg Waiman Long
2022-12-12 22:13 ` Tejun Heo
2022-12-12 22:16 ` Waiman Long
2022-12-11 22:20 ` [PATCH-block v2 2/3] blk-cgroup: Don't flush a blkg if destroyed Waiman Long
2022-12-12 12:59 ` Michal Koutný
2022-12-12 14:58 ` Waiman Long
2022-12-12 22:16 ` Tejun Heo
2022-12-13 0:21 ` Waiman Long
2022-12-11 22:20 ` [PATCH-block v2 3/3] blk-cgroup: Flush stats at blkgs destruction path Waiman Long
2022-12-12 22:24 ` Tejun Heo
2022-12-13 0:19 ` Waiman Long
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