From: Yu Kuai <yukuai3@xxxxxxxxxx> Our test reports a uaf for 'mddev->sync_thread': T1 T2 md_start_sync md_register_thread raid1d md_check_recovery md_reap_sync_thread md_unregister_thread kfree md_wakeup_thread wake_up ->sync_thread was freed Currently, a global spinlock 'pers_lock' is borrowed to protect 'mddev->thread', this problem can be fixed likewise, however, there might be similar problem for other md_thread, and I really don't like the idea to borrow a global lock. This patchset do some refactor, and then use a disk level spinlock to protect md_thread in relevant apis. Yu Kuai (5): md: pass a md_thread pointer to md_register_thread() md: refactor md_wakeup_thread() md: use md_thread api to wake up sync_thread md: pass a mddev to md_unregister_thread() md: protect md_thread with a new disk level spin lock drivers/md/dm-raid.c | 6 +- drivers/md/md-bitmap.c | 6 +- drivers/md/md-cluster.c | 39 +++++----- drivers/md/md-multipath.c | 8 +- drivers/md/md.c | 157 ++++++++++++++++++++------------------ drivers/md/md.h | 15 ++-- drivers/md/raid1.c | 19 +++-- drivers/md/raid10.c | 31 ++++---- drivers/md/raid5-cache.c | 19 +++-- drivers/md/raid5-ppl.c | 2 +- drivers/md/raid5.c | 48 ++++++------ 11 files changed, 175 insertions(+), 175 deletions(-) -- 2.31.1
