From 1fc6ad2f10ad6f597cbdb1f6f39b744ef3bb2ea6 Mon Sep 17 00:00:00 2001 From: Ronnie Sahlberg Date: Fri, 1 Jun 2018 10:53:07 +1000 Subject: [PATCH] cifs: remove header_preamble_size where it is always 0 Since header_preamble_size is 0 for SMB2+ we can remove it in those code paths that are only invoked from SMB2. Signed-off-by: Ronnie Sahlberg Signed-off-by: Steve French --- fs/cifs/smb2misc.c | 28 ++++++++++++---------------- fs/cifs/smb2ops.c | 44 ++++++++++++++++++-------------------------- fs/cifs/smb2pdu.c | 44 ++++++++++++++++++-------------------------- 3 files changed, 48 insertions(+), 68 deletions(-) diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c index d587a09..ea964f7 100644 --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -95,8 +95,7 @@ static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { #ifdef CONFIG_CIFS_SMB311 static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len, - __u32 non_ctxlen, - size_t hdr_preamble_size) + __u32 non_ctxlen) { __u16 neg_count; __u32 nc_offset, size_of_pad_before_neg_ctxts; @@ -110,12 +109,11 @@ static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len, /* Make sure that negotiate contexts start after gss security blob */ nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset); - if (nc_offset < non_ctxlen - hdr_preamble_size /* RFC1001 len */) { + if (nc_offset < non_ctxlen) { printk_once(KERN_WARNING "invalid negotiate context offset\n"); return 0; } - size_of_pad_before_neg_ctxts = nc_offset - - (non_ctxlen - hdr_preamble_size); + size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen; /* Verify that at least minimal negotiate contexts fit within frame */ if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) { @@ -134,7 +132,7 @@ static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len, int smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr) { - struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)(buf + srvr->vals->header_preamble_size); + struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf; struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr; __u64 mid; __u32 clc_len; /* calculated length */ @@ -183,8 +181,7 @@ smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr) } return 1; } - if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - - srvr->vals->header_preamble_size) { + if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) { cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n", mid); return 1; @@ -227,8 +224,7 @@ smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr) #ifdef CONFIG_CIFS_SMB311 if (shdr->Command == SMB2_NEGOTIATE) - clc_len += get_neg_ctxt_len(shdr, len, clc_len, - srvr->vals->header_preamble_size); + clc_len += get_neg_ctxt_len(shdr, len, clc_len); #endif /* SMB311 */ if (len != clc_len) { cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n", @@ -253,7 +249,7 @@ smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr) */ if (clc_len < len) { printk_once(KERN_WARNING - "SMB2 server sent bad RFC1001 len %d not %u\n", + "SMB2 server sent bad RFC1001 len %d not %d\n", len, clc_len); return 0; } @@ -401,7 +397,7 @@ smb2_calc_size(void *buf, struct TCP_Server_Info *srvr) int offset; /* the offset from the beginning of SMB to data area */ int data_length; /* the length of the variable length data area */ /* Structure Size has already been checked to make sure it is 64 */ - int len = srvr->vals->header_preamble_size + le16_to_cpu(shdr->StructureSize); + int len = le16_to_cpu(shdr->StructureSize); /* * StructureSize2, ie length of fixed parameter area has already @@ -422,12 +418,12 @@ smb2_calc_size(void *buf, struct TCP_Server_Info *srvr) * for some commands, typically those with odd StructureSize, * so we must add one to the calculation. */ - if (offset + srvr->vals->header_preamble_size + 1 < len) { - cifs_dbg(VFS, "data area offset %zu overlaps SMB2 header %d\n", - offset + srvr->vals->header_preamble_size + 1, len); + if (offset + 1 < len) { + cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n", + offset + 1, len); data_length = 0; } else { - len = srvr->vals->header_preamble_size + offset + data_length; + len = offset + data_length; } } calc_size_exit: diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index b0f3bf9..36e7495 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -1521,8 +1521,6 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, unsigned int sub_offset; unsigned int print_len; unsigned int print_offset; - struct cifs_ses *ses = tcon->ses; - struct TCP_Server_Info *server = ses->server; cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path); @@ -1546,7 +1544,7 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, err_buf = err_iov.iov_base; if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) || - err_iov.iov_len + server->vals->header_preamble_size < SMB2_SYMLINK_STRUCT_SIZE) { + err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE) { kfree(utf16_path); return -ENOENT; } @@ -1559,14 +1557,13 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, print_len = le16_to_cpu(symlink->PrintNameLength); print_offset = le16_to_cpu(symlink->PrintNameOffset); - if (err_iov.iov_len + server->vals->header_preamble_size < - SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) { + if (err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) { kfree(utf16_path); return -ENOENT; } - if (err_iov.iov_len + server->vals->header_preamble_size < - SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) { + if (err_iov.iov_len < + SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) { kfree(utf16_path); return -ENOENT; } @@ -2233,7 +2230,7 @@ crypt_message(struct TCP_Server_Info *server, struct smb_rqst *rqst, int enc) { struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)rqst->rq_iov[0].iov_base; - unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20 - server->vals->header_preamble_size; + unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20; int rc = 0; struct scatterlist *sg; u8 sign[SMB2_SIGNATURE_SIZE] = {}; @@ -2459,7 +2456,7 @@ decrypt_raw_data(struct TCP_Server_Info *server, char *buf, if (rc) return rc; - memmove(buf + server->vals->header_preamble_size, iov[2].iov_base, buf_data_size); + memmove(buf, iov[2].iov_base, buf_data_size); server->total_read = buf_data_size + page_data_size; @@ -2565,7 +2562,7 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid, return 0; } - data_offset = server->ops->read_data_offset(buf) + server->vals->header_preamble_size; + data_offset = server->ops->read_data_offset(buf); #ifdef CONFIG_CIFS_SMB_DIRECT use_rdma_mr = rdata->mr; #endif @@ -2661,12 +2658,11 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid) unsigned int npages; struct page **pages; unsigned int len; - unsigned int buflen = server->pdu_size + server->vals->header_preamble_size; + unsigned int buflen = server->pdu_size; int rc; int i = 0; - len = min_t(unsigned int, buflen, server->vals->read_rsp_size - - server->vals->header_preamble_size + + len = min_t(unsigned int, buflen, server->vals->read_rsp_size + sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1; rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len); @@ -2674,8 +2670,7 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid) return rc; server->total_read += rc; - len = le32_to_cpu(tr_hdr->OriginalMessageSize) + - server->vals->header_preamble_size - + len = le32_to_cpu(tr_hdr->OriginalMessageSize) - server->vals->read_rsp_size; npages = DIV_ROUND_UP(len, PAGE_SIZE); @@ -2702,8 +2697,7 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid) if (rc) goto free_pages; - rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size - - server->vals->header_preamble_size, + rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size, pages, npages, len); if (rc) goto free_pages; @@ -2740,7 +2734,7 @@ receive_encrypted_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid_entry; /* switch to large buffer if too big for a small one */ - if (pdu_length + server->vals->header_preamble_size > MAX_CIFS_SMALL_BUFFER_SIZE) { + if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) { server->large_buf = true; memcpy(server->bigbuf, buf, server->total_read); buf = server->bigbuf; @@ -2748,13 +2742,12 @@ receive_encrypted_standard(struct TCP_Server_Info *server, /* now read the rest */ length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, - pdu_length - HEADER_SIZE(server) + 1 + - server->vals->header_preamble_size); + pdu_length - HEADER_SIZE(server) + 1); if (length < 0) return length; server->total_read += length; - buf_size = pdu_length + server->vals->header_preamble_size - sizeof(struct smb2_transform_hdr); + buf_size = pdu_length - sizeof(struct smb2_transform_hdr); length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0); if (length) return length; @@ -2783,7 +2776,7 @@ smb3_receive_transform(struct TCP_Server_Info *server, struct mid_q_entry **mid) struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf; unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize); - if (pdu_length + server->vals->header_preamble_size < sizeof(struct smb2_transform_hdr) + + if (pdu_length < sizeof(struct smb2_transform_hdr) + sizeof(struct smb2_sync_hdr)) { cifs_dbg(VFS, "Transform message is too small (%u)\n", pdu_length); @@ -2792,14 +2785,14 @@ smb3_receive_transform(struct TCP_Server_Info *server, struct mid_q_entry **mid) return -ECONNABORTED; } - if (pdu_length + server->vals->header_preamble_size < orig_len + sizeof(struct smb2_transform_hdr)) { + if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) { cifs_dbg(VFS, "Transform message is broken\n"); cifs_reconnect(server); wake_up(&server->response_q); return -ECONNABORTED; } - if (pdu_length + server->vals->header_preamble_size > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) + if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) return receive_encrypted_read(server, mid); return receive_encrypted_standard(server, mid); @@ -2810,8 +2803,7 @@ smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid) { char *buf = server->large_buf ? server->bigbuf : server->smallbuf; - return handle_read_data(server, mid, buf, server->pdu_size + - server->vals->header_preamble_size, + return handle_read_data(server, mid, buf, server->pdu_size, NULL, 0, 0); } diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 134bb19..0ae3ff2 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -491,8 +491,7 @@ static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp, if (len_of_ctxts < sizeof(struct smb2_neg_context)) break; - pctx = (struct smb2_neg_context *)(offset + - server->vals->header_preamble_size + (char *)rsp); + pctx = (struct smb2_neg_context *)(offset + (char *)rsp); clen = le16_to_cpu(pctx->DataLength); if (clen > len_of_ctxts) break; @@ -1213,7 +1212,7 @@ SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data) if (rc) goto out; - if (offsetof(struct smb2_sess_setup_rsp, Buffer) - ses->server->vals->header_preamble_size != + if (offsetof(struct smb2_sess_setup_rsp, Buffer) != le16_to_cpu(rsp->SecurityBufferOffset)) { cifs_dbg(VFS, "Invalid security buffer offset %d\n", le16_to_cpu(rsp->SecurityBufferOffset)); @@ -1661,7 +1660,7 @@ parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp, unsigned int remaining; char *name; - data_offset = (char *)rsp + server->vals->header_preamble_size + le32_to_cpu(rsp->CreateContextsOffset); + data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset); remaining = le32_to_cpu(rsp->CreateContextsLength); cc = (struct create_context *)data_offset; while (remaining >= sizeof(struct create_context)) { @@ -2327,13 +2326,12 @@ SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, } static int -validate_iov(struct TCP_Server_Info *server, - unsigned int offset, unsigned int buffer_length, +validate_iov(unsigned int offset, unsigned int buffer_length, struct kvec *iov, unsigned int min_buf_size) { unsigned int smb_len = iov->iov_len; - char *end_of_smb = smb_len + server->vals->header_preamble_size + (char *)iov->iov_base; - char *begin_of_buf = server->vals->header_preamble_size + offset + (char *)iov->iov_base; + char *end_of_smb = smb_len + (char *)iov->iov_base; + char *begin_of_buf = offset + (char *)iov->iov_base; char *end_of_buf = begin_of_buf + buffer_length; @@ -2363,18 +2361,17 @@ validate_iov(struct TCP_Server_Info *server, * Caller must free buffer. */ static int -validate_and_copy_iov(struct TCP_Server_Info *server, - unsigned int offset, unsigned int buffer_length, +validate_and_copy_iov(unsigned int offset, unsigned int buffer_length, struct kvec *iov, unsigned int minbufsize, char *data) { - char *begin_of_buf = server->vals->header_preamble_size + offset + (char *)(iov->iov_base); + char *begin_of_buf = offset + (char *)iov->iov_base; int rc; if (!data) return -EINVAL; - rc = validate_iov(server, offset, buffer_length, iov, minbufsize); + rc = validate_iov(offset, buffer_length, iov, minbufsize); if (rc) return rc; @@ -2454,8 +2451,7 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon, } } - rc = validate_and_copy_iov(ses->server, - le16_to_cpu(rsp->OutputBufferOffset), + rc = validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, min_len, *data); @@ -3406,8 +3402,7 @@ SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, goto qdir_exit; } - rc = validate_iov(server, - le16_to_cpu(rsp->OutputBufferOffset), + rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, info_buf_size); if (rc) @@ -3742,7 +3737,7 @@ build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level, req->InputBufferOffset = cpu_to_le16(sizeof(struct smb2_query_info_req) - 1); req->OutputBufferLength = cpu_to_le32( - outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - server->vals->header_preamble_size); + outbuf_len + sizeof(struct smb2_query_info_rsp) - 1); iov->iov_base = (char *)req; iov->iov_len = total_len; @@ -3759,7 +3754,6 @@ SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon, int rc = 0; int resp_buftype; struct cifs_ses *ses = tcon->ses; - struct TCP_Server_Info *server = ses->server; struct smb2_fs_full_size_info *info = NULL; int flags = 0; @@ -3780,10 +3774,9 @@ SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon, } rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; - info = (struct smb2_fs_full_size_info *)(server->vals->header_preamble_size + + info = (struct smb2_fs_full_size_info *)( le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); - rc = validate_iov(server, - le16_to_cpu(rsp->OutputBufferOffset), + rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, sizeof(struct smb2_fs_full_size_info)); if (!rc) @@ -3804,7 +3797,6 @@ SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon, int rc = 0; int resp_buftype, max_len, min_len; struct cifs_ses *ses = tcon->ses; - struct TCP_Server_Info *server = ses->server; unsigned int rsp_len, offset; int flags = 0; @@ -3840,20 +3832,20 @@ SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon, rsp_len = le32_to_cpu(rsp->OutputBufferLength); offset = le16_to_cpu(rsp->OutputBufferOffset); - rc = validate_iov(server, offset, rsp_len, &rsp_iov, min_len); + rc = validate_iov(offset, rsp_len, &rsp_iov, min_len); if (rc) goto qfsattr_exit; if (level == FS_ATTRIBUTE_INFORMATION) - memcpy(&tcon->fsAttrInfo, server->vals->header_preamble_size + offset + memcpy(&tcon->fsAttrInfo, offset + (char *)rsp, min_t(unsigned int, rsp_len, max_len)); else if (level == FS_DEVICE_INFORMATION) - memcpy(&tcon->fsDevInfo, server->vals->header_preamble_size + offset + memcpy(&tcon->fsDevInfo, offset + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO)); else if (level == FS_SECTOR_SIZE_INFORMATION) { struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *) - (server->vals->header_preamble_size + offset + (char *)rsp); + (offset + (char *)rsp); tcon->ss_flags = le32_to_cpu(ss_info->Flags); tcon->perf_sector_size = le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf); -- 2.7.4