NothingOSS/android_kernel_msm-6.1_nothing_sm7635
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ksmbd: validate the zero field of packet header

Browse source 
[ Upstream commit 516b3eb8c8065f7465f87608d37a7ed08298c7a5 ]

The SMB2 Protocol requires that "The first byte of the Direct TCP
transport packet header MUST be zero (0x00)"[1]. Commit 1c1bcf2d3ea0
("ksmbd: validate smb request protocol id") removed the validation of
this 1-byte zero. Add the validation back now.

[1]: [MS-SMB2] - v20230227, page 30.
https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-SMB2/%5bMS-SMB2%5d-230227.pdf

Fixes: 1c1bcf2d3ea0 ("ksmbd: validate smb request protocol id")
Signed-off-by: Li Nan <linan122@huawei.com>
Acked-by: Tom Talpey <tom@talpey.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Li Nan 2023-12-08 14:56:47 +08:00 • committed by Greg Kroah-Hartman
parent 222618b737
commit 676af10d0c
1 changed files with 5 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
fs/smb/server/smb_common.c
View file

@ -158,8 +158,12 @@ int ksmbd_verify_smb_message(struct ksmbd_work *work)
*/
bool ksmbd_smb_request(struct ksmbd_conn *conn)
{
__le32 *proto = (__le32 *)smb2_get_msg(conn->request_buf);
__le32 *proto;
if (conn->request_buf[0] != 0)
return false;
proto = (__le32 *)smb2_get_msg(conn->request_buf);
if (*proto == SMB2_COMPRESSION_TRANSFORM_ID) {
pr_err_ratelimited("smb2 compression not support yet");
return false;