linux-toradex.git/fs/smb/server/connection.c, branch v6.7 Linux kernel for Apalis and Colibri modules ksmbd: no need to wait for binded connection termination at logoff 2023-10-31T02:58:12+00:00 Namjae Jeon linkinjeon@kernel.org 2023-10-29T11:58:28+00:00 67797da8a4b82446d42c52b6ee1419a3100d78ff The connection could be binded to the existing session for Multichannel. session will be destroyed when binded connections are released. So no need to wait for that's connection at logoff. Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> 
The connection could be binded to the existing session for Multichannel.
session will be destroyed when binded connections are released.
So no need to wait for that's connection at logoff.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
ksmbd: fix race condition between session lookup and expire 2023-10-05T01:21:48+00:00 Namjae Jeon linkinjeon@kernel.org 2023-10-04T09:25:01+00:00 53ff5cf89142b978b1a5ca8dc4d4425e6a09745f Thread A + Thread B ksmbd_session_lookup | smb2_sess_setup sess = xa_load | | | xa_erase(&conn->sessions, sess->id); | | ksmbd_session_destroy(sess) --> kfree(sess) | // UAF! | sess->last_active = jiffies | + This patch add rwsem to fix race condition between ksmbd_session_lookup and ksmbd_expire_session. Reported-by: luosili <rootlab@huawei.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> 
 Thread A                        +  Thread B
 ksmbd_session_lookup            |  smb2_sess_setup
   sess = xa_load                |
                                 |
                                 |    xa_erase(&conn->sessions, sess->id);
                                 |
                                 |    ksmbd_session_destroy(sess) --> kfree(sess)
                                 |
   // UAF!                       |
   sess->last_active = jiffies   |
                                 +

This patch add rwsem to fix race condition between ksmbd_session_lookup
and ksmbd_expire_session.

Reported-by: luosili <rootlab@huawei.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
ksmbd: check iov vector index in ksmbd_conn_write() 2023-09-21T19:41:06+00:00 Namjae Jeon linkinjeon@kernel.org 2023-09-21T06:37:06+00:00 73f949ea87c7d697210653501ca21efe57295327 If ->iov_idx is zero, This means that the iov vector for the response was not added during the request process. In other words, it means that there is a problem in generating a response, So this patch return as an error to avoid NULL pointer dereferencing problem. Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> 
If ->iov_idx is zero, This means that the iov vector for the response
was not added during the request process. In other words, it means that
there is a problem in generating a response, So this patch return as
an error to avoid NULL pointer dereferencing problem.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
ksmbd: add support for read compound 2023-08-29T17:30:19+00:00 Namjae Jeon linkinjeon@kernel.org 2023-08-29T14:39:31+00:00 e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d MacOS sends a compound request including read to the server (e.g. open-read-close). So far, ksmbd has not handled read as a compound request. For compatibility between ksmbd and an OS that supports SMB, This patch provides compound support for read requests. Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> 
MacOS sends a compound request including read to the server
(e.g. open-read-close). So far, ksmbd has not handled read as
a compound request. For compatibility between ksmbd and an OS that
supports SMB, This patch provides compound support for read requests.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
ksmbd: validate smb request protocol id 2023-06-02T17:30:57+00:00 Namjae Jeon linkinjeon@kernel.org 2023-05-31T08:59:32+00:00 1c1bcf2d3ea061613119b534f57507c377df20f9 This patch add the validation for smb request protocol id. If it is not one of the four ids(SMB1_PROTO_NUMBER, SMB2_PROTO_NUMBER, SMB2_TRANSFORM_PROTO_NUM, SMB2_COMPRESSION_TRANSFORM_ID), don't allow processing the request. And this will fix the following KASAN warning also. [ 13.905265] BUG: KASAN: slab-out-of-bounds in init_smb2_rsp_hdr+0x1b9/0x1f0 [ 13.905900] Read of size 16 at addr ffff888005fd2f34 by task kworker/0:2/44 ... [ 13.908553] Call Trace: [ 13.908793] <TASK> [ 13.908995] dump_stack_lvl+0x33/0x50 [ 13.909369] print_report+0xcc/0x620 [ 13.910870] kasan_report+0xae/0xe0 [ 13.911519] kasan_check_range+0x35/0x1b0 [ 13.911796] init_smb2_rsp_hdr+0x1b9/0x1f0 [ 13.912492] handle_ksmbd_work+0xe5/0x820 Cc: stable@vger.kernel.org Reported-by: Chih-Yen Chang <cc85nod@gmail.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> 
This patch add the validation for smb request protocol id.
If it is not one of the four ids(SMB1_PROTO_NUMBER, SMB2_PROTO_NUMBER,
SMB2_TRANSFORM_PROTO_NUM, SMB2_COMPRESSION_TRANSFORM_ID), don't allow
processing the request. And this will fix the following KASAN warning
also.

[   13.905265] BUG: KASAN: slab-out-of-bounds in init_smb2_rsp_hdr+0x1b9/0x1f0
[   13.905900] Read of size 16 at addr ffff888005fd2f34 by task kworker/0:2/44
...
[   13.908553] Call Trace:
[   13.908793]  <TASK>
[   13.908995]  dump_stack_lvl+0x33/0x50
[   13.909369]  print_report+0xcc/0x620
[   13.910870]  kasan_report+0xae/0xe0
[   13.911519]  kasan_check_range+0x35/0x1b0
[   13.911796]  init_smb2_rsp_hdr+0x1b9/0x1f0
[   13.912492]  handle_ksmbd_work+0xe5/0x820

Cc: stable@vger.kernel.org
Reported-by: Chih-Yen Chang <cc85nod@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
ksmbd: check the validation of pdu_size in ksmbd_conn_handler_loop 2023-06-02T17:30:57+00:00 Namjae Jeon linkinjeon@kernel.org 2023-05-30T14:10:31+00:00 368ba06881c395f1c9a7ba22203cf8d78b4addc0 The length field of netbios header must be greater than the SMB header sizes(smb1 or smb2 header), otherwise the packet is an invalid SMB packet. If `pdu_size` is 0, ksmbd allocates a 4 bytes chunk to `conn->request_buf`. In the function `get_smb2_cmd_val` ksmbd will read cmd from `rcv_hdr->Command`, which is `conn->request_buf + 12`, causing the KASAN detector to print the following error message: [ 7.205018] BUG: KASAN: slab-out-of-bounds in get_smb2_cmd_val+0x45/0x60 [ 7.205423] Read of size 2 at addr ffff8880062d8b50 by task ksmbd:42632/248 ... [ 7.207125] <TASK> [ 7.209191] get_smb2_cmd_val+0x45/0x60 [ 7.209426] ksmbd_conn_enqueue_request+0x3a/0x100 [ 7.209712] ksmbd_server_process_request+0x72/0x160 [ 7.210295] ksmbd_conn_handler_loop+0x30c/0x550 [ 7.212280] kthread+0x160/0x190 [ 7.212762] ret_from_fork+0x1f/0x30 [ 7.212981] </TASK> Cc: stable@vger.kernel.org Reported-by: Chih-Yen Chang <cc85nod@gmail.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> 
The length field of netbios header must be greater than the SMB header
sizes(smb1 or smb2 header), otherwise the packet is an invalid SMB packet.

If `pdu_size` is 0, ksmbd allocates a 4 bytes chunk to `conn->request_buf`.
In the function `get_smb2_cmd_val` ksmbd will read cmd from
`rcv_hdr->Command`, which is `conn->request_buf + 12`, causing the KASAN
detector to print the following error message:

[    7.205018] BUG: KASAN: slab-out-of-bounds in get_smb2_cmd_val+0x45/0x60
[    7.205423] Read of size 2 at addr ffff8880062d8b50 by task ksmbd:42632/248
...
[    7.207125]  <TASK>
[    7.209191]  get_smb2_cmd_val+0x45/0x60
[    7.209426]  ksmbd_conn_enqueue_request+0x3a/0x100
[    7.209712]  ksmbd_server_process_request+0x72/0x160
[    7.210295]  ksmbd_conn_handler_loop+0x30c/0x550
[    7.212280]  kthread+0x160/0x190
[    7.212762]  ret_from_fork+0x1f/0x30
[    7.212981]  </TASK>

Cc: stable@vger.kernel.org
Reported-by: Chih-Yen Chang <cc85nod@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
smb: move client and server files to common directory fs/smb 2023-05-24T21:29:21+00:00 Steve French stfrench@microsoft.com 2023-05-22T01:46:30+00:00 38c8a9a52082579090e34c033d439ed2cd1a462d Move CIFS/SMB3 related client and server files (cifs.ko and ksmbd.ko and helper modules) to new fs/smb subdirectory: fs/cifs --> fs/smb/client fs/ksmbd --> fs/smb/server fs/smbfs_common --> fs/smb/common Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> 
Move CIFS/SMB3 related client and server files (cifs.ko and ksmbd.ko
and helper modules) to new fs/smb subdirectory:

   fs/cifs --> fs/smb/client
   fs/ksmbd --> fs/smb/server
   fs/smbfs_common --> fs/smb/common

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>