From: Namjae Jeon <linkinjeon@kernel.org> stable inclusion from stable-v5.15.145 commit 5c0df9d30c289d6b9d7d44e2a450de2f8e3cf40b category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I92OOJ CVE: CVE-2023-52441 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 536bb492d39bb6c080c92f31e8a55fe9934f452b ] If client send smb2 negotiate request and then send smb1 negotiate request, init_smb2_rsp_hdr is called for smb1 negotiate request since need_neg is set to false. This patch ignore smb1 packets after ->need_neg is set to false. Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-21541 Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com> --- fs/ksmbd/server.c | 7 ++++++- fs/ksmbd/smb_common.c | 19 +++++++++++-------- fs/ksmbd/smb_common.h | 2 +- 3 files changed, 18 insertions(+), 10 deletions(-) diff --git a/fs/ksmbd/server.c b/fs/ksmbd/server.c index 5d7c1af71ca2..b353b3f91ce2 100644 --- a/fs/ksmbd/server.c +++ b/fs/ksmbd/server.c @@ -286,6 +286,7 @@ static void handle_ksmbd_work(struct work_struct *wk) static int queue_ksmbd_work(struct ksmbd_conn *conn) { struct ksmbd_work *work; + int err; work = ksmbd_alloc_work_struct(); if (!work) { @@ -297,7 +298,11 @@ static int queue_ksmbd_work(struct ksmbd_conn *conn) work->request_buf = conn->request_buf; conn->request_buf = NULL; - ksmbd_init_smb_server(work); + err = ksmbd_init_smb_server(work); + if (err) { + ksmbd_free_work_struct(work); + return 0; + } ksmbd_conn_enqueue_request(work); atomic_inc(&conn->r_count); diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c index eab3f78c7b39..3a3b2210a590 100644 --- a/fs/ksmbd/smb_common.c +++ b/fs/ksmbd/smb_common.c @@ -386,26 +386,29 @@ static struct smb_version_cmds smb1_server_cmds[1] = { [SMB_COM_NEGOTIATE_EX] = { .proc = smb1_negotiate, }, }; -static void init_smb1_server(struct ksmbd_conn *conn) +static int init_smb1_server(struct ksmbd_conn *conn) { conn->ops = &smb1_server_ops; conn->cmds = smb1_server_cmds; conn->max_cmds = ARRAY_SIZE(smb1_server_cmds); + return 0; } -void ksmbd_init_smb_server(struct ksmbd_work *work) +int ksmbd_init_smb_server(struct ksmbd_work *work) { struct ksmbd_conn *conn = work->conn; __le32 proto; - if (conn->need_neg == false) - return; - proto = *(__le32 *)((struct smb_hdr *)work->request_buf)->Protocol; + if (conn->need_neg == false) { + if (proto == SMB1_PROTO_NUMBER) + return -EINVAL; + return 0; + } + if (proto == SMB1_PROTO_NUMBER) - init_smb1_server(conn); - else - init_smb3_11_server(conn); + return init_smb1_server(conn); + return init_smb3_11_server(conn); } int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level, diff --git a/fs/ksmbd/smb_common.h b/fs/ksmbd/smb_common.h index fd7a57f685f7..ceb3cacaef1b 100644 --- a/fs/ksmbd/smb_common.h +++ b/fs/ksmbd/smb_common.h @@ -474,7 +474,7 @@ bool ksmbd_smb_request(struct ksmbd_conn *conn); int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16 dialects_count); -void ksmbd_init_smb_server(struct ksmbd_work *work); +int ksmbd_init_smb_server(struct ksmbd_work *work); struct ksmbd_kstat; int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, -- 2.34.3