From: Namjae Jeon linkinjeon@kernel.org
[ Upstream commit c6cd2e8d2d9aa7ee35b1fa6a668e32a22a9753da ]
I found potencial out-of-bounds when buffer offset fields of a few requests is invalid. This patch set the minimum value of buffer offset field to ->Buffer offset to validate buffer length.
Cc: stable@vger.kernel.org Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Bin Lan bin.lan.cn@windriver.com Signed-off-by: He Zhe zhe.he@windriver.com --- Build test passed. --- fs/ksmbd/smb2misc.c | 22 +++++++++++++++------ fs/ksmbd/smb2pdu.c | 47 ++++++++++++++++++++++++--------------------- 2 files changed, 41 insertions(+), 28 deletions(-)
diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c index 4d1211bde190..9e54ecc9d4ad 100644 --- a/fs/ksmbd/smb2misc.c +++ b/fs/ksmbd/smb2misc.c @@ -102,7 +102,9 @@ static int smb2_get_data_area_len(unsigned int *off, unsigned int *len, *len = le16_to_cpu(((struct smb2_sess_setup_req *)hdr)->SecurityBufferLength); break; case SMB2_TREE_CONNECT: - *off = le16_to_cpu(((struct smb2_tree_connect_req *)hdr)->PathOffset); + *off = max_t(unsigned short int, + le16_to_cpu(((struct smb2_tree_connect_req *)hdr)->PathOffset), + offsetof(struct smb2_tree_connect_req, Buffer)); *len = le16_to_cpu(((struct smb2_tree_connect_req *)hdr)->PathLength); break; case SMB2_CREATE: @@ -129,11 +131,15 @@ static int smb2_get_data_area_len(unsigned int *off, unsigned int *len, break; } case SMB2_QUERY_INFO: - *off = le16_to_cpu(((struct smb2_query_info_req *)hdr)->InputBufferOffset); + *off = max_t(unsigned int, + le16_to_cpu(((struct smb2_query_info_req *)hdr)->InputBufferOffset), + offsetof(struct smb2_query_info_req, Buffer)); *len = le32_to_cpu(((struct smb2_query_info_req *)hdr)->InputBufferLength); break; case SMB2_SET_INFO: - *off = le16_to_cpu(((struct smb2_set_info_req *)hdr)->BufferOffset); + *off = max_t(unsigned int, + le16_to_cpu(((struct smb2_set_info_req *)hdr)->BufferOffset), + offsetof(struct smb2_set_info_req, Buffer)); *len = le32_to_cpu(((struct smb2_set_info_req *)hdr)->BufferLength); break; case SMB2_READ: @@ -143,7 +149,7 @@ static int smb2_get_data_area_len(unsigned int *off, unsigned int *len, case SMB2_WRITE: if (((struct smb2_write_req *)hdr)->DataOffset || ((struct smb2_write_req *)hdr)->Length) { - *off = max_t(unsigned int, + *off = max_t(unsigned short int, le16_to_cpu(((struct smb2_write_req *)hdr)->DataOffset), offsetof(struct smb2_write_req, Buffer) - 4); *len = le32_to_cpu(((struct smb2_write_req *)hdr)->Length); @@ -154,7 +160,9 @@ static int smb2_get_data_area_len(unsigned int *off, unsigned int *len, *len = le16_to_cpu(((struct smb2_write_req *)hdr)->WriteChannelInfoLength); break; case SMB2_QUERY_DIRECTORY: - *off = le16_to_cpu(((struct smb2_query_directory_req *)hdr)->FileNameOffset); + *off = max_t(unsigned short int, + le16_to_cpu(((struct smb2_query_directory_req *)hdr)->FileNameOffset), + offsetof(struct smb2_query_directory_req, Buffer)); *len = le16_to_cpu(((struct smb2_query_directory_req *)hdr)->FileNameLength); break; case SMB2_LOCK: @@ -169,7 +177,9 @@ static int smb2_get_data_area_len(unsigned int *off, unsigned int *len, break; } case SMB2_IOCTL: - *off = le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputOffset); + *off = max_t(unsigned int, + le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputOffset), + offsetof(struct smb2_ioctl_req, Buffer)); *len = le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputCount); break; default: diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 82b6be188ad4..46fd8d5a2047 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -1971,7 +1971,7 @@ int smb2_tree_connect(struct ksmbd_work *work)
WORK_BUFFERS(work, req, rsp);
- treename = smb_strndup_from_utf16(req->Buffer, + treename = smb_strndup_from_utf16((char *)req + le16_to_cpu(req->PathOffset), le16_to_cpu(req->PathLength), true, conn->local_nls); if (IS_ERR(treename)) { @@ -2718,7 +2718,7 @@ int smb2_open(struct ksmbd_work *work) goto err_out2; }
- name = smb2_get_name(req->Buffer, + name = smb2_get_name((char *)req + le16_to_cpu(req->NameOffset), le16_to_cpu(req->NameLength), work->conn->local_nls); if (IS_ERR(name)) { @@ -4090,7 +4090,7 @@ int smb2_query_dir(struct ksmbd_work *work) }
srch_flag = req->Flags; - srch_ptr = smb_strndup_from_utf16(req->Buffer, + srch_ptr = smb_strndup_from_utf16((char *)req + le16_to_cpu(req->FileNameOffset), le16_to_cpu(req->FileNameLength), 1, conn->local_nls); if (IS_ERR(srch_ptr)) { @@ -4350,7 +4350,8 @@ static int smb2_get_ea(struct ksmbd_work *work, struct ksmbd_file *fp, sizeof(struct smb2_ea_info_req)) return -EINVAL;
- ea_req = (struct smb2_ea_info_req *)req->Buffer; + ea_req = (struct smb2_ea_info_req *)((char *)req + + le16_to_cpu(req->InputBufferOffset)); } else { /* need to send all EAs, if no specific EA is requested*/ if (le32_to_cpu(req->Flags) & SL_RETURN_SINGLE_ENTRY) @@ -5956,6 +5957,7 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, struct ksmbd_share_config *share) { unsigned int buf_len = le32_to_cpu(req->BufferLength); + char *buffer = (char *)req + le16_to_cpu(req->BufferOffset);
switch (req->FileInfoClass) { case FILE_BASIC_INFORMATION: @@ -5963,7 +5965,7 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, if (buf_len < sizeof(struct smb2_file_basic_info)) return -EINVAL;
- return set_file_basic_info(fp, (struct smb2_file_basic_info *)req->Buffer, share); + return set_file_basic_info(fp, (struct smb2_file_basic_info *)buffer, share); } case FILE_ALLOCATION_INFORMATION: { @@ -5971,7 +5973,7 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, return -EINVAL;
return set_file_allocation_info(work, fp, - (struct smb2_file_alloc_info *)req->Buffer); + (struct smb2_file_alloc_info *)buffer); } case FILE_END_OF_FILE_INFORMATION: { @@ -5979,7 +5981,7 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, return -EINVAL;
return set_end_of_file_info(work, fp, - (struct smb2_file_eof_info *)req->Buffer); + (struct smb2_file_eof_info *)buffer); } case FILE_RENAME_INFORMATION: { @@ -5987,7 +5989,7 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, return -EINVAL;
return set_rename_info(work, fp, - (struct smb2_file_rename_info *)req->Buffer, + (struct smb2_file_rename_info *)buffer, buf_len); } case FILE_LINK_INFORMATION: @@ -5996,7 +5998,7 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, return -EINVAL;
return smb2_create_link(work, work->tcon->share_conf, - (struct smb2_file_link_info *)req->Buffer, + (struct smb2_file_link_info *)buffer, buf_len, fp->filp, work->conn->local_nls); } @@ -6006,7 +6008,7 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, return -EINVAL;
return set_file_disposition_info(fp, - (struct smb2_file_disposition_info *)req->Buffer); + (struct smb2_file_disposition_info *)buffer); } case FILE_FULL_EA_INFORMATION: { @@ -6019,7 +6021,7 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, if (buf_len < sizeof(struct smb2_ea_info)) return -EINVAL;
- return smb2_set_ea((struct smb2_ea_info *)req->Buffer, + return smb2_set_ea((struct smb2_ea_info *)buffer, buf_len, &fp->filp->f_path, true); } case FILE_POSITION_INFORMATION: @@ -6027,14 +6029,14 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, if (buf_len < sizeof(struct smb2_file_pos_info)) return -EINVAL;
- return set_file_position_info(fp, (struct smb2_file_pos_info *)req->Buffer); + return set_file_position_info(fp, (struct smb2_file_pos_info *)buffer); } case FILE_MODE_INFORMATION: { if (buf_len < sizeof(struct smb2_file_mode_info)) return -EINVAL;
- return set_file_mode_info(fp, (struct smb2_file_mode_info *)req->Buffer); + return set_file_mode_info(fp, (struct smb2_file_mode_info *)buffer); } }
@@ -6115,7 +6117,7 @@ int smb2_set_info(struct ksmbd_work *work) } rc = smb2_set_info_sec(fp, le32_to_cpu(req->AdditionalInformation), - req->Buffer, + (char *)req + le16_to_cpu(req->BufferOffset), le32_to_cpu(req->BufferLength)); ksmbd_revert_fsids(work); break; @@ -7567,7 +7569,7 @@ static int fsctl_pipe_transceive(struct ksmbd_work *work, u64 id, struct smb2_ioctl_rsp *rsp) { struct ksmbd_rpc_command *rpc_resp; - char *data_buf = (char *)&req->Buffer[0]; + char *data_buf = (char *)req + le32_to_cpu(req->InputOffset); int nbytes = 0;
rpc_resp = ksmbd_rpc_ioctl(work->sess, id, data_buf, @@ -7680,6 +7682,7 @@ int smb2_ioctl(struct ksmbd_work *work) u64 id = KSMBD_NO_FID; struct ksmbd_conn *conn = work->conn; int ret = 0; + char *buffer;
if (work->next_smb2_rcv_hdr_off) { req = ksmbd_req_buf_next(work); @@ -7702,6 +7705,7 @@ int smb2_ioctl(struct ksmbd_work *work) goto out; }
+ buffer = (char *)req + le32_to_cpu(req->InputOffset); cnt_code = le32_to_cpu(req->CntCode); ret = smb2_calc_max_out_buf_len(work, 48, le32_to_cpu(req->MaxOutputResponse)); @@ -7759,7 +7763,7 @@ int smb2_ioctl(struct ksmbd_work *work) }
ret = fsctl_validate_negotiate_info(conn, - (struct validate_negotiate_info_req *)&req->Buffer[0], + (struct validate_negotiate_info_req *)buffer, (struct validate_negotiate_info_rsp *)&rsp->Buffer[0], in_buf_len); if (ret < 0) @@ -7812,7 +7816,7 @@ int smb2_ioctl(struct ksmbd_work *work) rsp->VolatileFileId = req->VolatileFileId; rsp->PersistentFileId = req->PersistentFileId; fsctl_copychunk(work, - (struct copychunk_ioctl_req *)&req->Buffer[0], + (struct copychunk_ioctl_req *)buffer, le32_to_cpu(req->CntCode), le32_to_cpu(req->InputCount), req->VolatileFileId, @@ -7825,8 +7829,7 @@ int smb2_ioctl(struct ksmbd_work *work) goto out; }
- ret = fsctl_set_sparse(work, id, - (struct file_sparse *)&req->Buffer[0]); + ret = fsctl_set_sparse(work, id, (struct file_sparse *)buffer); if (ret < 0) goto out; break; @@ -7849,7 +7852,7 @@ int smb2_ioctl(struct ksmbd_work *work) }
zero_data = - (struct file_zero_data_information *)&req->Buffer[0]; + (struct file_zero_data_information *)buffer;
off = le64_to_cpu(zero_data->FileOffset); bfz = le64_to_cpu(zero_data->BeyondFinalZero); @@ -7880,7 +7883,7 @@ int smb2_ioctl(struct ksmbd_work *work) }
ret = fsctl_query_allocated_ranges(work, id, - (struct file_allocated_range_buffer *)&req->Buffer[0], + (struct file_allocated_range_buffer *)buffer, (struct file_allocated_range_buffer *)&rsp->Buffer[0], out_buf_len / sizeof(struct file_allocated_range_buffer), &nbytes); @@ -7924,7 +7927,7 @@ int smb2_ioctl(struct ksmbd_work *work) goto out; }
- dup_ext = (struct duplicate_extents_to_file *)&req->Buffer[0]; + dup_ext = (struct duplicate_extents_to_file *)buffer;
fp_in = ksmbd_lookup_fd_slow(work, dup_ext->VolatileFileHandle, dup_ext->PersistentFileHandle);