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authorHyunchul Lee <hyc.lee@gmail.com>2022-01-20 21:10:11 +0900
committerSteve French <stfrench@microsoft.com>2022-02-04 00:12:22 -0600
commit6d896d3b44cf64ab9b2483697e222098e7b72f70 (patch)
tree62dfde791fdf65ee93304594ae7d14c77167db7e /fs/ksmbd
parent9ca8581e79e51c57e60b3b8e3b89d816448f49fe (diff)
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ksmbd: smbd: validate buffer descriptor structures
Check ChannelInfoOffset and ChannelInfoLength to validate buffer descriptor structures. And add a debug log to print the structures' content. Acked-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/ksmbd')
-rw-r--r--fs/ksmbd/smb2pdu.c36
1 files changed, 30 insertions, 6 deletions
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 3926ca18dca4..6806994383d9 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -6126,13 +6126,26 @@ static int smb2_set_remote_key_for_rdma(struct ksmbd_work *work,
__le16 ChannelInfoOffset,
__le16 ChannelInfoLength)
{
+ unsigned int i, ch_count;
+
if (work->conn->dialect == SMB30_PROT_ID &&
Channel != SMB2_CHANNEL_RDMA_V1)
return -EINVAL;
- if (ChannelInfoOffset == 0 ||
- le16_to_cpu(ChannelInfoLength) < sizeof(*desc))
+ ch_count = le16_to_cpu(ChannelInfoLength) / sizeof(*desc);
+ if (ksmbd_debug_types & KSMBD_DEBUG_RDMA) {
+ for (i = 0; i < ch_count; i++) {
+ pr_info("RDMA r/w request %#x: token %#x, length %#x\n",
+ i,
+ le32_to_cpu(desc[i].token),
+ le32_to_cpu(desc[i].length));
+ }
+ }
+ if (ch_count != 1) {
+ ksmbd_debug(RDMA, "RDMA multiple buffer descriptors %d are not supported yet\n",
+ ch_count);
return -EINVAL;
+ }
work->need_invalidate_rkey =
(Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE);
@@ -6185,9 +6198,15 @@ int smb2_read(struct ksmbd_work *work)
if (req->Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE ||
req->Channel == SMB2_CHANNEL_RDMA_V1) {
+ unsigned int ch_offset = le16_to_cpu(req->ReadChannelInfoOffset);
+
+ if (ch_offset < offsetof(struct smb2_read_req, Buffer)) {
+ err = -EINVAL;
+ goto out;
+ }
err = smb2_set_remote_key_for_rdma(work,
(struct smb2_buffer_desc_v1 *)
- &req->Buffer[0],
+ ((char *)req + ch_offset),
req->Channel,
req->ReadChannelInfoOffset,
req->ReadChannelInfoLength);
@@ -6428,11 +6447,16 @@ int smb2_write(struct ksmbd_work *work)
if (req->Channel == SMB2_CHANNEL_RDMA_V1 ||
req->Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE) {
- if (req->Length != 0 || req->DataOffset != 0)
- return -EINVAL;
+ unsigned int ch_offset = le16_to_cpu(req->WriteChannelInfoOffset);
+
+ if (req->Length != 0 || req->DataOffset != 0 ||
+ ch_offset < offsetof(struct smb2_write_req, Buffer)) {
+ err = -EINVAL;
+ goto out;
+ }
err = smb2_set_remote_key_for_rdma(work,
(struct smb2_buffer_desc_v1 *)
- &req->Buffer[0],
+ ((char *)req + ch_offset),
req->Channel,
req->WriteChannelInfoOffset,
req->WriteChannelInfoLength);