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ksmbd: smbd: validate buffer descriptor structures

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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>
This commit is contained in:
Hyunchul Lee 2022-01-20 21:10:11 +09:00 committed by Steve French
parent 9ca8581e79
commit 6d896d3b44
1 changed files with 30 additions and 6 deletions
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36
fs/ksmbd/smb2pdu.c
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@ -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);