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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1776956583; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:references:dkim-signature; bh=RKHCHCe0pmoPcECwaTmWcIE27CrGNeqC4X3BUhLLxG0=; b=CVhWt/uURPgvi6Dt3T50RkuC5ZbbOGEYe+faXskrW9kt8wVe3TPx9TGFVp5Hqeolv88iKO tQDLcLIXYaPloQwWHeHLoF8ismcMN8DI8iu6HS66agbNOS2cgCGmYcIxIpFwRrsZpoMXxd O4Rd6I+P8z/jAldzD59X57294Zk95Z4= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 5A7B343597; Thu, 23 Apr 2026 15:03:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03D6FC2BCAF; Thu, 23 Apr 2026 15:03:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776956582; bh=rQtJyg98FPKQTGRAUXuSfYXDH7AOf6p1ENCuefnOVK8=; h=From:To:Cc:Subject:Date:From; b=s9++1bKZIRQFMWLOYuaJsuL4IQQDmbqEmbx20BBr+2XLP36ZgEIDUA+1dQrUUALOm Xup12QRFQ/4GBYsi2Pye3ObpCvg8lsOi66YlxwFJHaalagYQ7AC0t5lkhLBmHtauhP PzPZREJdJbzgYgHp9/M88z55JDauXRC1h10GYZpjFGVuBwcs3iz1fGBMtH6VpT/Ji6 JffDgyRxI/KvdvvVyLnKn0vJ2ABb79MS3NmWevwQNgZUzVzFx7XOkWnbuRngbZ7x6L EOBiY/+kSlzqC4WsErkL/NdNZWFB7fDbNyNSZXd3zXXm4tAzx630bUan5ruymYMVJ5 g9/ZVHGxQ3C7Q== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , "# 6 . 16 . x" , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 0/2] mm/damon/sysfs-schemes: fix use-after-free for [memcg_]path Date: Thu, 23 Apr 2026 08:02:50 -0700 Message-ID: <20260423150253.111520-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5C722180004 X-Rspamd-Server: rspam12 X-Stat-Signature: nf34itk9tfz4e6dcgzj33dt7wr54j7i6 X-Rspam-User: X-HE-Tag: 1776956583-857381 X-HE-Meta: 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 HR8+qv14 4+Q2jbT+k5Mo7sD06eiew7Ea9myRcspC7dOGO9L+nJ+2QuiIa+wPSK9/07X9ls7pmpMf0KZkW6se+yFWftRtR9mHIZh7ju7rRWD/BjNMQws9nGMiYO1bBNul4L3eGQ0giY96e5iKqGZJFjifRpY/rmjIIceIRt8N0dkhBh8Cf5Na8163GWH6dNGNLcb6CaUnMyr2mzh1lqn+F8xNcqbR75fjCeA71NzJkpG4FLbkkks1cIs/dSdL9J+pVALbuh+Euvu2HQ3iOc6HWlfNpYZzqvuk+WVyb8hfPjBKKZLtpI38qZTg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Reads of 'memcg_path' and 'path' files in DAMON sysfs interface could race with their writes, results in use-after-free. Fix those. Changes from RFC - rfc: https://lore.kernel.org/20260422144059.72000-1-sj@kernel.org - Fix a typo in commit description. - Drop RFC tag. - Rebase to latest mm-hotfixes-unstable. Changes from v2 - v2: https://lore.kernel.org/20260420125405.362137-1-qjx1298677004@gmail.com - Split patch for individual fixes commits. - Hand-off authorship to SJ, give Co-developed-by: to Junxi. - Use mutex_trylock() instead of mutex_lock(). - Add RFC tag for Sashiko review round. - Wordsmith commit messages. Changes from v1 - v1: https://lore.kernel.org/20260420085332.178473-1-qjx1298677004@gmail.com - Protect not only user-writes but also user-reads. SeongJae Park (2): mm/damon/sysfs-schemes: protect memcg_path kfree() with damon_sysfs_lock mm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock mm/damon/sysfs-schemes.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) base-commit: 26232ccdfcc7029d92b633b01f5f22913ab72168 -- 2.47.3