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There is a room in smb_break_all_levII_oplock that can cause racy issues when unlocking in the middle of the loop. This patch use read lock to protect whole loop. Cc: stable@vger.kernel.org Reported-by: Norbert Szetei <norbert@doyensec.com> Tested-by: Norbert Szetei <norbert@doyensec.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
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* Copyright (C) 2018 Samsung Electronics Co., Ltd.
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*/
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#ifndef __KSMBD_OPLOCK_H
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#define __KSMBD_OPLOCK_H
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#include "smb_common.h"
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#define OPLOCK_WAIT_TIME (35 * HZ)
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/* Oplock states */
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#define OPLOCK_STATE_NONE 0x00
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#define OPLOCK_ACK_WAIT 0x01
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#define OPLOCK_CLOSING 0x02
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#define OPLOCK_WRITE_TO_READ 0x01
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#define OPLOCK_READ_HANDLE_TO_READ 0x02
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#define OPLOCK_WRITE_TO_NONE 0x04
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#define OPLOCK_READ_TO_NONE 0x08
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struct lease_ctx_info {
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__u8 lease_key[SMB2_LEASE_KEY_SIZE];
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__le32 req_state;
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__le32 flags;
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__le64 duration;
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__u8 parent_lease_key[SMB2_LEASE_KEY_SIZE];
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__le16 epoch;
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int version;
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bool is_dir;
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};
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struct lease_table {
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char client_guid[SMB2_CLIENT_GUID_SIZE];
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struct list_head lease_list;
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struct list_head l_entry;
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spinlock_t lb_lock;
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};
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struct lease {
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__u8 lease_key[SMB2_LEASE_KEY_SIZE];
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__le32 state;
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__le32 new_state;
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__le32 flags;
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__le64 duration;
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__u8 parent_lease_key[SMB2_LEASE_KEY_SIZE];
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int version;
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unsigned short epoch;
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bool is_dir;
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struct lease_table *l_lb;
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};
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struct oplock_info {
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struct ksmbd_conn *conn;
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struct ksmbd_session *sess;
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struct ksmbd_work *work;
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struct ksmbd_file *o_fp;
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int level;
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int op_state;
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unsigned long pending_break;
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u64 fid;
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atomic_t breaking_cnt;
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atomic_t refcount;
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__u16 Tid;
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bool is_lease;
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bool open_trunc; /* truncate on open */
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struct lease *o_lease;
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struct list_head op_entry;
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struct list_head lease_entry;
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wait_queue_head_t oplock_q; /* Other server threads */
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wait_queue_head_t oplock_brk; /* oplock breaking wait */
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};
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struct lease_break_info {
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__le32 curr_state;
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__le32 new_state;
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__le16 epoch;
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char lease_key[SMB2_LEASE_KEY_SIZE];
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};
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struct oplock_break_info {
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int level;
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int open_trunc;
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int fid;
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};
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int smb_grant_oplock(struct ksmbd_work *work, int req_op_level,
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u64 pid, struct ksmbd_file *fp, __u16 tid,
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struct lease_ctx_info *lctx, int share_ret);
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void smb_break_all_levII_oplock(struct ksmbd_work *work,
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struct ksmbd_file *fp, int is_trunc);
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int opinfo_write_to_read(struct oplock_info *opinfo);
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int opinfo_read_handle_to_read(struct oplock_info *opinfo);
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int opinfo_write_to_none(struct oplock_info *opinfo);
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int opinfo_read_to_none(struct oplock_info *opinfo);
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void close_id_del_oplock(struct ksmbd_file *fp);
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void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp);
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struct oplock_info *opinfo_get(struct ksmbd_file *fp);
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void opinfo_put(struct oplock_info *opinfo);
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/* Lease related functions */
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void create_lease_buf(u8 *rbuf, struct lease *lease);
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struct lease_ctx_info *parse_lease_state(void *open_req);
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__u8 smb2_map_lease_to_oplock(__le32 lease_state);
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int lease_read_to_write(struct oplock_info *opinfo);
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/* Durable related functions */
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void create_durable_rsp_buf(char *cc);
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void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp);
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void create_mxac_rsp_buf(char *cc, int maximal_access);
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void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id);
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void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp);
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struct create_context *smb2_find_context_vals(void *open_req, const char *tag, int tag_len);
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struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn,
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char *lease_key);
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int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci,
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struct lease_ctx_info *lctx);
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void destroy_lease_table(struct ksmbd_conn *conn);
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void smb_send_parent_lease_break_noti(struct ksmbd_file *fp,
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struct lease_ctx_info *lctx);
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void smb_lazy_parent_lease_break_close(struct ksmbd_file *fp);
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int smb2_check_durable_oplock(struct ksmbd_conn *conn,
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struct ksmbd_share_config *share,
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struct ksmbd_file *fp,
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struct lease_ctx_info *lctx,
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char *name);
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#endif /* __KSMBD_OPLOCK_H */
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