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Code Issues Releases Wiki Activity

ksmbd: fix wrong interim response on compound

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If smb2_lock or smb2_open request is compound, ksmbd could send wrong
interim response to client. ksmbd allocate new interim buffer instead of
using resonse buffer to support compound request.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2023-08-19 20:26:17 +09:00 committed by Steve French
parent e2b76ab8b5
commit 041bba4414
4 changed files with 26 additions and 26 deletions
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10
fs/smb/server/ksmbd_work.c
View file

@ -160,9 +160,11 @@ int ksmbd_iov_pin_rsp_read(struct ksmbd_work *work, void *ib, int len,
return __ksmbd_iov_pin_rsp(work, ib, len, aux_buf, aux_size);
}
void ksmbd_iov_reset(struct ksmbd_work *work)
int allocate_interim_rsp_buf(struct ksmbd_work *work)
{
work->iov_idx = 0;
work->iov_cnt = 0;
*(__be32 *)work->iov[0].iov_base = 0;
work->response_buf = kzalloc(MAX_CIFS_SMALL_BUFFER_SIZE, GFP_KERNEL);
if (!work->response_buf)
return -ENOMEM;
work->response_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
return 0;
}

2
fs/smb/server/ksmbd_work.h
View file

@ -131,5 +131,5 @@ bool ksmbd_queue_work(struct ksmbd_work *work);
int ksmbd_iov_pin_rsp_read(struct ksmbd_work *work, void *ib, int len,
void *aux_buf, unsigned int aux_size);
int ksmbd_iov_pin_rsp(struct ksmbd_work *work, void *ib, int len);
void ksmbd_iov_reset(struct ksmbd_work *work);
int allocate_interim_rsp_buf(struct ksmbd_work *work);
#endif /* __KSMBD_WORK_H__ */

14
fs/smb/server/oplock.c
View file

@ -616,15 +616,6 @@ static int oplock_break_pending(struct oplock_info *opinfo, int req_op_level)
return 0;
}
static inline int allocate_oplock_break_buf(struct ksmbd_work *work)
{
work->response_buf = kzalloc(MAX_CIFS_SMALL_BUFFER_SIZE, GFP_KERNEL);
if (!work->response_buf)
return -ENOMEM;
work->response_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
return 0;
}
/**
* __smb2_oplock_break_noti() - send smb2 oplock break cmd from conn
* to client
@ -647,7 +638,7 @@ static void __smb2_oplock_break_noti(struct work_struct *wk)
if (!fp)
goto out;
if (allocate_oplock_break_buf(work)) {
if (allocate_interim_rsp_buf(work)) {
pr_err("smb2_allocate_rsp_buf failed! ");
ksmbd_fd_put(work, fp);
goto out;
@ -752,7 +743,7 @@ static void __smb2_lease_break_noti(struct work_struct *wk)
struct lease_break_info *br_info = work->request_buf;
struct smb2_hdr *rsp_hdr;
if (allocate_oplock_break_buf(work)) {
if (allocate_interim_rsp_buf(work)) {
ksmbd_debug(OPLOCK, "smb2_allocate_rsp_buf failed! ");
goto out;
}
@ -843,7 +834,6 @@ static int smb2_lease_break_noti(struct oplock_info *opinfo)
setup_async_work(in_work, NULL, NULL);
smb2_send_interim_resp(in_work, STATUS_PENDING);
list_del(&in_work->interim_entry);
ksmbd_iov_reset(in_work);
}
INIT_WORK(&work->work, __smb2_lease_break_noti);
ksmbd_queue_work(work);

26
fs/smb/server/smb2pdu.c
View file

@ -153,8 +153,8 @@ void smb2_set_err_rsp(struct ksmbd_work *work)
err_rsp->ByteCount = 0;
err_rsp->ErrorData[0] = 0;
err = ksmbd_iov_pin_rsp(work, (void *)err_rsp,
work->conn->vals->header_size +
SMB2_ERROR_STRUCTURE_SIZE2);
__SMB2_HEADER_STRUCTURE_SIZE +
SMB2_ERROR_STRUCTURE_SIZE2);
if (err)
work->send_no_response = 1;
}
@ -709,13 +709,24 @@ void release_async_work(struct ksmbd_work *work)
void smb2_send_interim_resp(struct ksmbd_work *work, __le32 status)
{
struct smb2_hdr *rsp_hdr;
struct ksmbd_work *in_work = ksmbd_alloc_work_struct();
rsp_hdr = ksmbd_resp_buf_next(work);
smb2_set_err_rsp(work);
if (allocate_interim_rsp_buf(in_work)) {
pr_err("smb_allocate_rsp_buf failed!\n");
ksmbd_free_work_struct(in_work);
return;
}
in_work->conn = work->conn;
memcpy(smb2_get_msg(in_work->response_buf), ksmbd_resp_buf_next(work),
__SMB2_HEADER_STRUCTURE_SIZE);
rsp_hdr = smb2_get_msg(in_work->response_buf);
smb2_set_err_rsp(in_work);
rsp_hdr->Status = status;
ksmbd_conn_write(work);
rsp_hdr->Status = 0;
ksmbd_conn_write(in_work);
ksmbd_free_work_struct(in_work);
}
static __le32 smb2_get_reparse_tag_special_file(umode_t mode)
@ -7049,8 +7060,6 @@ int smb2_lock(struct ksmbd_work *work)
list_del(&work->fp_entry);
spin_unlock(&fp->f_lock);
ksmbd_iov_reset(work);
if (work->state != KSMBD_WORK_ACTIVE) {
list_del(&smb_lock->llist);
spin_lock(&work->conn->llist_lock);
@ -7068,7 +7077,6 @@ int smb2_lock(struct ksmbd_work *work)
goto out;
}
init_smb2_rsp_hdr(work);
rsp->hdr.Status =
STATUS_RANGE_NOT_LOCKED;
kfree(smb_lock);