CVSS
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Описание
Оригинално описание
In the Linux kernel, the following vulnerability has been resolved: ksmbd: don't hold ci->m_lock while waiting for a lease break ack When a cifs.ko client caches a read-handle (RH) lease via deferred close and a conflicting open arrives, ksmbd breaks the lease and waits for the acknowledgment in wait_for_break_ack() for up to OPLOCK_WAIT_TIME (35s). __smb_break_all_levII_oplock() runs that wait while holding ci->m_lock for read. cifs.ko reacts to a handle-lease break by closing the deferred handle rather than sending a lease break acknowledgment. That close path (close_id_del_oplock() -> opinfo_del()) takes ci->m_lock for write and is exactly what would wake the waiter, but it blocks on the read lock held by the waiting thread. The break is then resolved only by the 35s timeout, so xfstests generic/001 takes ~78s with leases enabled versus ~4s with oplocks only. Collect the target opinfos (each pinned with a reference) while holding ci->m_lock, then break them after releasing it, matching how smb_grant_oplock() already breaks a conflicting lease using only a reference. The reference keeps the opinfo (and its conn and lease) alive across the unlocked window, and a close racing the break is handled by the existing OPLOCK_CLOSING state check. Apply the same fix to the parent lease break paths.
Засегнати продукти
- Linux Linux: d1c189c6cb8b0fb7b5ee549237d27889c40c2f8b преди 868c9038ffd4af39766d087f68c8f543a3f66635; d1c189c6cb8b0fb7b5ee549237d27889c40c2f8b преди 27a9bc968d4ae809a3f5ca2f2b136856ee613cb4; 16ece7c5645a68efca22a0a69a7718c8e50c3232; 6.6.35 преди 6.7
- Linux Linux: 6.9; преди 6.9; 6.18.53 до 6.18.*; 7.2 до *
История
- 23 октомври 2026 Публикувано