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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a822bf3ffsm431044285e9.7.2026.05.05.05.33.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2026 05:33:31 -0700 (PDT) From: Tristan Madani To: Dave Kleikamp Cc: jfs-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzbot+c244f4a09ca85dd2ebc1@syzkaller.appspotmail.com, syzbot+885a4f3281b8d99c48d8@syzkaller.appspotmail.com, stable@vger.kernel.org, Tristan Madani Subject: [PATCH v2 0/2] jfs: fix use-after-free races during unmount Date: Tue, 5 May 2026 12:33:28 +0000 Message-ID: <20260505123330.2822833-1-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260501110236.43226-1-tristmd@gmail.com> References: <20260501110236.43226-1-tristmd@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tristan Madani Two related UAF races exist in JFS unmount: 1. jfs_lazycommit accesses freed jfs_sb_info/jfs_log after unmount proceeds past jfs_flush_journal but before jfsCommit drains TxAnchor.unlock_queue. 2. lbmIODone (BIO completion in softirq) accesses freed lbuf fields after lbmLogShutdown frees all lbufs from the freelist. V1 fixed only race #1. Syzbot testing showed that race #2 can still trigger independently. This V2 adds a second patch for the BIO completion race. Changes since v1: - Split into two patches (one per race) - NEW: patch 2/2 adds atomic io_count to drain in-flight BIO completions before lbmLogShutdown frees lbufs Tristan Madani (2): jfs: drain lazy commit queue during unmount to prevent use-after-free jfs: wait for in-flight log I/O before freeing lbufs in lbmLogShutdown fs/jfs/jfs_logmgr.c | 10 ++++++++++ fs/jfs/jfs_logmgr.h | 2 ++ fs/jfs/jfs_txnmgr.c | 35 +++++++++++++++++++++++++++++++++++ fs/jfs/jfs_txnmgr.h | 1 + fs/jfs/jfs_umount.c | 8 ++++++++ 5 files changed, 56 insertions(+) -- 2.47.3