linux-kernel - [PATCH mm-unstable 0/2] mm/damon/sysfs-schemes: avoid updating

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Message-Id: <20221114182954.4745-1-sj@kernel.org>
Date:   Mon, 14 Nov 2022 18:29:52 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     SeongJae Park <sj@...nel.org>, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH mm-unstable 0/2] mm/damon/sysfs-schemes: avoid updating

A DAMON sysfs interface user can start DAMON with a scheme, remove the
sysfs directory for the scheme, and then ask clears/updates of the
scheme's tried regions.  Because the schemes tried regions clear/update
logic doesn't aware of the situation, it results in an invalid memory
access.  Fix the bugs by checking if the scheme sysfs directory exists.

This patchset is fixing commits in mm-unstable.  Andrew, please meld the
first patch into "mm/damon/sysfs: implement DAMOS tried regions update
command"[1], and the second patch into "mm/damon/sysfs-schemes:
implement DAMOS-tried regions clear command"[2].

[1] https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-sysfs-implement-damos-tried-regions-update-command.patch
[2] https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-sysfs-schemes-implement-damos-tried-regions-clear-command.patch

SeongJae Park (2):
  mm/damon/sysfs-schemes: skip tried regions update if the scheme
    directory has removed
  mm/damon/sysfs-schemes: skip schemes regions clearing if the scheme
    directory has removed

 mm/damon/sysfs-schemes.c | 9 +++++++++
 1 file changed, 9 insertions(+)

-- 
2.25.1