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![Kees Cook](/assets/img/avatar_default.png)
The kernel is globally removing the ambiguous 0-length and 1-element arrays in favor of flexible arrays, so that we can gain both compile-time and run-time array bounds checking[1]. Replace the trailing 1-element array with a flexible array in the following structures: struct smb2_err_rsp struct smb2_tree_connect_req struct smb2_negotiate_rsp struct smb2_sess_setup_req struct smb2_sess_setup_rsp struct smb2_read_req struct smb2_read_rsp struct smb2_write_req struct smb2_write_rsp struct smb2_query_directory_req struct smb2_query_directory_rsp struct smb2_set_info_req struct smb2_change_notify_rsp struct smb2_create_rsp struct smb2_query_info_req struct smb2_query_info_rsp Replace the trailing 1-element array with a flexible array, but leave the existing structure padding: struct smb2_file_all_info struct smb2_lock_req Adjust all related size calculations to match the changes to sizeof(). No machine code output or .data section differences are produced after these changes. [1] For lots of details, see both: https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays https://people.kernel.org/kees/bounded-flexible-arrays-in-c Cc: Steve French <sfrench@samba.org> Cc: Paulo Alcantara <pc@cjr.nz> Cc: Ronnie Sahlberg <lsahlber@redhat.com> Cc: Shyam Prasad N <sprasad@microsoft.com> Cc: Tom Talpey <tom@talpey.com> Cc: Namjae Jeon <linkinjeon@kernel.org> Cc: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Reviewed-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Steve French <stfrench@microsoft.com>
944 lines
26 KiB
C
944 lines
26 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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*
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* Copyright (C) International Business Machines Corp., 2002,2011
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* Etersoft, 2012
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Pavel Shilovsky (pshilovsky@samba.org) 2012
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*
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*/
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#include <linux/ctype.h>
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "smb2proto.h"
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#include "cifs_debug.h"
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#include "cifs_unicode.h"
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#include "smb2status.h"
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#include "smb2glob.h"
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#include "nterr.h"
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#include "cached_dir.h"
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static int
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check_smb2_hdr(struct smb2_hdr *shdr, __u64 mid)
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{
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__u64 wire_mid = le64_to_cpu(shdr->MessageId);
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/*
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* Make sure that this really is an SMB, that it is a response,
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* and that the message ids match.
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*/
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if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) &&
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(mid == wire_mid)) {
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if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
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return 0;
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else {
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/* only one valid case where server sends us request */
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if (shdr->Command == SMB2_OPLOCK_BREAK)
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return 0;
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else
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cifs_dbg(VFS, "Received Request not response\n");
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}
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} else { /* bad signature or mid */
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if (shdr->ProtocolId != SMB2_PROTO_NUMBER)
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cifs_dbg(VFS, "Bad protocol string signature header %x\n",
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le32_to_cpu(shdr->ProtocolId));
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if (mid != wire_mid)
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cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
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mid, wire_mid);
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}
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cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid);
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return 1;
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}
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/*
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* The following table defines the expected "StructureSize" of SMB2 responses
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* in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses.
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*
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* Note that commands are defined in smb2pdu.h in le16 but the array below is
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* indexed by command in host byte order
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*/
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static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
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/* SMB2_NEGOTIATE */ cpu_to_le16(65),
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/* SMB2_SESSION_SETUP */ cpu_to_le16(9),
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/* SMB2_LOGOFF */ cpu_to_le16(4),
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/* SMB2_TREE_CONNECT */ cpu_to_le16(16),
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/* SMB2_TREE_DISCONNECT */ cpu_to_le16(4),
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/* SMB2_CREATE */ cpu_to_le16(89),
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/* SMB2_CLOSE */ cpu_to_le16(60),
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/* SMB2_FLUSH */ cpu_to_le16(4),
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/* SMB2_READ */ cpu_to_le16(17),
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/* SMB2_WRITE */ cpu_to_le16(17),
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/* SMB2_LOCK */ cpu_to_le16(4),
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/* SMB2_IOCTL */ cpu_to_le16(49),
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/* BB CHECK this ... not listed in documentation */
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/* SMB2_CANCEL */ cpu_to_le16(0),
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/* SMB2_ECHO */ cpu_to_le16(4),
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/* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9),
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/* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9),
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/* SMB2_QUERY_INFO */ cpu_to_le16(9),
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/* SMB2_SET_INFO */ cpu_to_le16(2),
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/* BB FIXME can also be 44 for lease break */
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/* SMB2_OPLOCK_BREAK */ cpu_to_le16(24)
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};
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#define SMB311_NEGPROT_BASE_SIZE (sizeof(struct smb2_hdr) + sizeof(struct smb2_negotiate_rsp))
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static __u32 get_neg_ctxt_len(struct smb2_hdr *hdr, __u32 len,
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__u32 non_ctxlen)
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{
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__u16 neg_count;
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__u32 nc_offset, size_of_pad_before_neg_ctxts;
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struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr;
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/* Negotiate contexts are only valid for latest dialect SMB3.11 */
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neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount);
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if ((neg_count == 0) ||
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(pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID)))
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return 0;
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/*
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* if SPNEGO blob present (ie the RFC2478 GSS info which indicates
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* which security mechanisms the server supports) make sure that
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* the negotiate contexts start after it
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*/
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nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
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/*
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* non_ctxlen is at least shdr->StructureSize + pdu->StructureSize2
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* and the latter is 1 byte bigger than the fix-sized area of the
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* NEGOTIATE response
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*/
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if (nc_offset + 1 < non_ctxlen) {
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pr_warn_once("Invalid negotiate context offset %d\n", nc_offset);
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return 0;
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} else if (nc_offset + 1 == non_ctxlen) {
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cifs_dbg(FYI, "no SPNEGO security blob in negprot rsp\n");
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size_of_pad_before_neg_ctxts = 0;
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} else if (non_ctxlen == SMB311_NEGPROT_BASE_SIZE + 1)
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/* has padding, but no SPNEGO blob */
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size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen + 1;
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else
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size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen;
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/* Verify that at least minimal negotiate contexts fit within frame */
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if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) {
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pr_warn_once("negotiate context goes beyond end\n");
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return 0;
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}
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cifs_dbg(FYI, "length of negcontexts %d pad %d\n",
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len - nc_offset, size_of_pad_before_neg_ctxts);
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/* length of negcontexts including pad from end of sec blob to them */
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return (len - nc_offset) + size_of_pad_before_neg_ctxts;
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}
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int
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smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *server)
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{
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struct TCP_Server_Info *pserver;
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struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
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struct smb2_pdu *pdu = (struct smb2_pdu *)shdr;
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int hdr_size = sizeof(struct smb2_hdr);
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int pdu_size = sizeof(struct smb2_pdu);
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int command;
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__u32 calc_len; /* calculated length */
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__u64 mid;
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/* If server is a channel, select the primary channel */
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pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
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/*
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* Add function to do table lookup of StructureSize by command
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* ie Validate the wct via smb2_struct_sizes table above
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*/
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if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
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struct smb2_transform_hdr *thdr =
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(struct smb2_transform_hdr *)buf;
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struct cifs_ses *ses = NULL;
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struct cifs_ses *iter;
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/* decrypt frame now that it is completely read in */
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each_entry(iter, &pserver->smb_ses_list, smb_ses_list) {
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if (iter->Suid == le64_to_cpu(thdr->SessionId)) {
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ses = iter;
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break;
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}
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}
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spin_unlock(&cifs_tcp_ses_lock);
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if (!ses) {
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cifs_dbg(VFS, "no decryption - session id not found\n");
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return 1;
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}
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}
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mid = le64_to_cpu(shdr->MessageId);
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if (len < pdu_size) {
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if ((len >= hdr_size)
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&& (shdr->Status != 0)) {
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pdu->StructureSize2 = 0;
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/*
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* As with SMB/CIFS, on some error cases servers may
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* not return wct properly
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*/
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return 0;
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} else {
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cifs_dbg(VFS, "Length less than SMB header size\n");
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}
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return 1;
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}
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if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) {
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cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
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mid);
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return 1;
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}
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if (check_smb2_hdr(shdr, mid))
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return 1;
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if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
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cifs_dbg(VFS, "Invalid structure size %u\n",
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le16_to_cpu(shdr->StructureSize));
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return 1;
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}
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command = le16_to_cpu(shdr->Command);
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if (command >= NUMBER_OF_SMB2_COMMANDS) {
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cifs_dbg(VFS, "Invalid SMB2 command %d\n", command);
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return 1;
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}
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if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
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if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
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pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2_LE)) {
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/* error packets have 9 byte structure size */
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cifs_dbg(VFS, "Invalid response size %u for command %d\n",
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le16_to_cpu(pdu->StructureSize2), command);
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return 1;
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} else if (command == SMB2_OPLOCK_BREAK_HE
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&& (shdr->Status == 0)
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&& (le16_to_cpu(pdu->StructureSize2) != 44)
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&& (le16_to_cpu(pdu->StructureSize2) != 36)) {
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/* special case for SMB2.1 lease break message */
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cifs_dbg(VFS, "Invalid response size %d for oplock break\n",
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le16_to_cpu(pdu->StructureSize2));
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return 1;
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}
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}
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calc_len = smb2_calc_size(buf);
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/* For SMB2_IOCTL, OutputOffset and OutputLength are optional, so might
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* be 0, and not a real miscalculation */
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if (command == SMB2_IOCTL_HE && calc_len == 0)
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return 0;
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if (command == SMB2_NEGOTIATE_HE)
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calc_len += get_neg_ctxt_len(shdr, len, calc_len);
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if (len != calc_len) {
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/* create failed on symlink */
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if (command == SMB2_CREATE_HE &&
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shdr->Status == STATUS_STOPPED_ON_SYMLINK)
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return 0;
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/* Windows 7 server returns 24 bytes more */
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if (calc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
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return 0;
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/* server can return one byte more due to implied bcc[0] */
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if (calc_len == len + 1)
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return 0;
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/*
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* Some windows servers (win2016) will pad also the final
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* PDU in a compound to 8 bytes.
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*/
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if (ALIGN(calc_len, 8) == len)
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return 0;
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/*
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* MacOS server pads after SMB2.1 write response with 3 bytes
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* of junk. Other servers match RFC1001 len to actual
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* SMB2/SMB3 frame length (header + smb2 response specific data)
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* Some windows servers also pad up to 8 bytes when compounding.
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*/
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if (calc_len < len)
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return 0;
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/* Only log a message if len was really miscalculated */
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if (unlikely(cifsFYI))
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cifs_dbg(FYI, "Server response too short: calculated "
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"length %u doesn't match read length %u (cmd=%d, mid=%llu)\n",
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calc_len, len, command, mid);
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else
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pr_warn("Server response too short: calculated length "
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"%u doesn't match read length %u (cmd=%d, mid=%llu)\n",
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calc_len, len, command, mid);
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return 1;
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}
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return 0;
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}
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/*
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* The size of the variable area depends on the offset and length fields
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* located in different fields for various SMB2 responses. SMB2 responses
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* with no variable length info, show an offset of zero for the offset field.
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*/
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static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
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/* SMB2_NEGOTIATE */ true,
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/* SMB2_SESSION_SETUP */ true,
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/* SMB2_LOGOFF */ false,
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/* SMB2_TREE_CONNECT */ false,
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/* SMB2_TREE_DISCONNECT */ false,
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/* SMB2_CREATE */ true,
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/* SMB2_CLOSE */ false,
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/* SMB2_FLUSH */ false,
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/* SMB2_READ */ true,
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/* SMB2_WRITE */ false,
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/* SMB2_LOCK */ false,
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/* SMB2_IOCTL */ true,
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/* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
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/* SMB2_ECHO */ false,
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/* SMB2_QUERY_DIRECTORY */ true,
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/* SMB2_CHANGE_NOTIFY */ true,
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/* SMB2_QUERY_INFO */ true,
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/* SMB2_SET_INFO */ false,
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/* SMB2_OPLOCK_BREAK */ false
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};
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/*
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* Returns the pointer to the beginning of the data area. Length of the data
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* area and the offset to it (from the beginning of the smb are also returned.
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*/
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char *
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smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *shdr)
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{
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*off = 0;
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*len = 0;
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/* error responses do not have data area */
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if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
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(((struct smb2_err_rsp *)shdr)->StructureSize) ==
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SMB2_ERROR_STRUCTURE_SIZE2_LE)
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return NULL;
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/*
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* Following commands have data areas so we have to get the location
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* of the data buffer offset and data buffer length for the particular
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* command.
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*/
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switch (shdr->Command) {
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case SMB2_NEGOTIATE:
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*off = le16_to_cpu(
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((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
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*len = le16_to_cpu(
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((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
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break;
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case SMB2_SESSION_SETUP:
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*off = le16_to_cpu(
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((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
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*len = le16_to_cpu(
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((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
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break;
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case SMB2_CREATE:
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*off = le32_to_cpu(
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((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
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*len = le32_to_cpu(
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((struct smb2_create_rsp *)shdr)->CreateContextsLength);
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break;
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case SMB2_QUERY_INFO:
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*off = le16_to_cpu(
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((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
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*len = le32_to_cpu(
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((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
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break;
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case SMB2_READ:
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/* TODO: is this a bug ? */
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*off = ((struct smb2_read_rsp *)shdr)->DataOffset;
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*len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
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break;
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case SMB2_QUERY_DIRECTORY:
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*off = le16_to_cpu(
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((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
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*len = le32_to_cpu(
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((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
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break;
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case SMB2_IOCTL:
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*off = le32_to_cpu(
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((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
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*len = le32_to_cpu(
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((struct smb2_ioctl_rsp *)shdr)->OutputCount);
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break;
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case SMB2_CHANGE_NOTIFY:
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*off = le16_to_cpu(
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((struct smb2_change_notify_rsp *)shdr)->OutputBufferOffset);
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*len = le32_to_cpu(
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((struct smb2_change_notify_rsp *)shdr)->OutputBufferLength);
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break;
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default:
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cifs_dbg(VFS, "no length check for command %d\n", le16_to_cpu(shdr->Command));
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break;
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}
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/*
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* Invalid length or offset probably means data area is invalid, but
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* we have little choice but to ignore the data area in this case.
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*/
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if (*off > 4096) {
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cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
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*len = 0;
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*off = 0;
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} else if (*off < 0) {
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cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
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*off);
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*off = 0;
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*len = 0;
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} else if (*len < 0) {
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cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
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*len);
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*len = 0;
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} else if (*len > 128 * 1024) {
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cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
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*len = 0;
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}
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/* return pointer to beginning of data area, ie offset from SMB start */
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if ((*off != 0) && (*len != 0))
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return (char *)shdr + *off;
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else
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return NULL;
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}
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/*
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* Calculate the size of the SMB message based on the fixed header
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* portion, the number of word parameters and the data portion of the message.
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*/
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unsigned int
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smb2_calc_size(void *buf)
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{
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struct smb2_pdu *pdu = buf;
|
|
struct smb2_hdr *shdr = &pdu->hdr;
|
|
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 = le16_to_cpu(shdr->StructureSize);
|
|
|
|
/*
|
|
* StructureSize2, ie length of fixed parameter area has already
|
|
* been checked to make sure it is the correct length.
|
|
*/
|
|
len += le16_to_cpu(pdu->StructureSize2);
|
|
|
|
if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
|
|
goto calc_size_exit;
|
|
|
|
smb2_get_data_area_len(&offset, &data_length, shdr);
|
|
cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
|
|
|
|
if (data_length > 0) {
|
|
/*
|
|
* Check to make sure that data area begins after fixed area,
|
|
* Note that last byte of the fixed area is part of data area
|
|
* for some commands, typically those with odd StructureSize,
|
|
* so we must add one to the calculation.
|
|
*/
|
|
if (offset + 1 < len) {
|
|
cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
|
|
offset + 1, len);
|
|
data_length = 0;
|
|
} else {
|
|
len = offset + data_length;
|
|
}
|
|
}
|
|
calc_size_exit:
|
|
cifs_dbg(FYI, "SMB2 len %d\n", len);
|
|
return len;
|
|
}
|
|
|
|
/* Note: caller must free return buffer */
|
|
__le16 *
|
|
cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
|
|
{
|
|
int len;
|
|
const char *start_of_path;
|
|
__le16 *to;
|
|
int map_type;
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
|
|
map_type = SFM_MAP_UNI_RSVD;
|
|
else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
|
|
map_type = SFU_MAP_UNI_RSVD;
|
|
else
|
|
map_type = NO_MAP_UNI_RSVD;
|
|
|
|
/* Windows doesn't allow paths beginning with \ */
|
|
if (from[0] == '\\')
|
|
start_of_path = from + 1;
|
|
|
|
/* SMB311 POSIX extensions paths do not include leading slash */
|
|
else if (cifs_sb_master_tlink(cifs_sb) &&
|
|
cifs_sb_master_tcon(cifs_sb)->posix_extensions &&
|
|
(from[0] == '/')) {
|
|
start_of_path = from + 1;
|
|
} else
|
|
start_of_path = from;
|
|
|
|
to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
|
|
cifs_sb->local_nls, map_type);
|
|
return to;
|
|
}
|
|
|
|
__le32
|
|
smb2_get_lease_state(struct cifsInodeInfo *cinode)
|
|
{
|
|
__le32 lease = 0;
|
|
|
|
if (CIFS_CACHE_WRITE(cinode))
|
|
lease |= SMB2_LEASE_WRITE_CACHING_LE;
|
|
if (CIFS_CACHE_HANDLE(cinode))
|
|
lease |= SMB2_LEASE_HANDLE_CACHING_LE;
|
|
if (CIFS_CACHE_READ(cinode))
|
|
lease |= SMB2_LEASE_READ_CACHING_LE;
|
|
return lease;
|
|
}
|
|
|
|
struct smb2_lease_break_work {
|
|
struct work_struct lease_break;
|
|
struct tcon_link *tlink;
|
|
__u8 lease_key[16];
|
|
__le32 lease_state;
|
|
};
|
|
|
|
static void
|
|
cifs_ses_oplock_break(struct work_struct *work)
|
|
{
|
|
struct smb2_lease_break_work *lw = container_of(work,
|
|
struct smb2_lease_break_work, lease_break);
|
|
int rc = 0;
|
|
|
|
rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
|
|
lw->lease_state);
|
|
|
|
cifs_dbg(FYI, "Lease release rc %d\n", rc);
|
|
cifs_put_tlink(lw->tlink);
|
|
kfree(lw);
|
|
}
|
|
|
|
static void
|
|
smb2_queue_pending_open_break(struct tcon_link *tlink, __u8 *lease_key,
|
|
__le32 new_lease_state)
|
|
{
|
|
struct smb2_lease_break_work *lw;
|
|
|
|
lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
|
|
if (!lw) {
|
|
cifs_put_tlink(tlink);
|
|
return;
|
|
}
|
|
|
|
INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
|
|
lw->tlink = tlink;
|
|
lw->lease_state = new_lease_state;
|
|
memcpy(lw->lease_key, lease_key, SMB2_LEASE_KEY_SIZE);
|
|
queue_work(cifsiod_wq, &lw->lease_break);
|
|
}
|
|
|
|
static bool
|
|
smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp)
|
|
{
|
|
__u8 lease_state;
|
|
struct cifsFileInfo *cfile;
|
|
struct cifsInodeInfo *cinode;
|
|
int ack_req = le32_to_cpu(rsp->Flags &
|
|
SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
|
|
|
|
lease_state = le32_to_cpu(rsp->NewLeaseState);
|
|
|
|
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
|
|
cinode = CIFS_I(d_inode(cfile->dentry));
|
|
|
|
if (memcmp(cinode->lease_key, rsp->LeaseKey,
|
|
SMB2_LEASE_KEY_SIZE))
|
|
continue;
|
|
|
|
cifs_dbg(FYI, "found in the open list\n");
|
|
cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
|
|
lease_state);
|
|
|
|
if (ack_req)
|
|
cfile->oplock_break_cancelled = false;
|
|
else
|
|
cfile->oplock_break_cancelled = true;
|
|
|
|
set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
|
|
|
|
cfile->oplock_epoch = le16_to_cpu(rsp->Epoch);
|
|
cfile->oplock_level = lease_state;
|
|
|
|
cifs_queue_oplock_break(cfile);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static struct cifs_pending_open *
|
|
smb2_tcon_find_pending_open_lease(struct cifs_tcon *tcon,
|
|
struct smb2_lease_break *rsp)
|
|
{
|
|
__u8 lease_state = le32_to_cpu(rsp->NewLeaseState);
|
|
int ack_req = le32_to_cpu(rsp->Flags &
|
|
SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
|
|
struct cifs_pending_open *open;
|
|
struct cifs_pending_open *found = NULL;
|
|
|
|
list_for_each_entry(open, &tcon->pending_opens, olist) {
|
|
if (memcmp(open->lease_key, rsp->LeaseKey,
|
|
SMB2_LEASE_KEY_SIZE))
|
|
continue;
|
|
|
|
if (!found && ack_req) {
|
|
found = open;
|
|
}
|
|
|
|
cifs_dbg(FYI, "found in the pending open list\n");
|
|
cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
|
|
lease_state);
|
|
|
|
open->oplock = lease_state;
|
|
}
|
|
|
|
return found;
|
|
}
|
|
|
|
static bool
|
|
smb2_is_valid_lease_break(char *buffer, struct TCP_Server_Info *server)
|
|
{
|
|
struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
|
|
struct TCP_Server_Info *pserver;
|
|
struct cifs_ses *ses;
|
|
struct cifs_tcon *tcon;
|
|
struct cifs_pending_open *open;
|
|
|
|
cifs_dbg(FYI, "Checking for lease break\n");
|
|
|
|
/* If server is a channel, select the primary channel */
|
|
pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
|
|
|
|
/* look up tcon based on tid & uid */
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
|
|
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
|
|
spin_lock(&tcon->open_file_lock);
|
|
cifs_stats_inc(
|
|
&tcon->stats.cifs_stats.num_oplock_brks);
|
|
if (smb2_tcon_has_lease(tcon, rsp)) {
|
|
spin_unlock(&tcon->open_file_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return true;
|
|
}
|
|
open = smb2_tcon_find_pending_open_lease(tcon,
|
|
rsp);
|
|
if (open) {
|
|
__u8 lease_key[SMB2_LEASE_KEY_SIZE];
|
|
struct tcon_link *tlink;
|
|
|
|
tlink = cifs_get_tlink(open->tlink);
|
|
memcpy(lease_key, open->lease_key,
|
|
SMB2_LEASE_KEY_SIZE);
|
|
spin_unlock(&tcon->open_file_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
smb2_queue_pending_open_break(tlink,
|
|
lease_key,
|
|
rsp->NewLeaseState);
|
|
return true;
|
|
}
|
|
spin_unlock(&tcon->open_file_lock);
|
|
|
|
if (cached_dir_lease_break(tcon, rsp->LeaseKey)) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
|
|
trace_smb3_lease_not_found(le32_to_cpu(rsp->CurrentLeaseState),
|
|
le32_to_cpu(rsp->hdr.Id.SyncId.TreeId),
|
|
le64_to_cpu(rsp->hdr.SessionId),
|
|
*((u64 *)rsp->LeaseKey),
|
|
*((u64 *)&rsp->LeaseKey[8]));
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
|
|
{
|
|
struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
|
|
struct TCP_Server_Info *pserver;
|
|
struct cifs_ses *ses;
|
|
struct cifs_tcon *tcon;
|
|
struct cifsInodeInfo *cinode;
|
|
struct cifsFileInfo *cfile;
|
|
|
|
cifs_dbg(FYI, "Checking for oplock break\n");
|
|
|
|
if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
|
|
return false;
|
|
|
|
if (rsp->StructureSize !=
|
|
smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
|
|
if (le16_to_cpu(rsp->StructureSize) == 44)
|
|
return smb2_is_valid_lease_break(buffer, server);
|
|
else
|
|
return false;
|
|
}
|
|
|
|
cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
|
|
|
|
/* If server is a channel, select the primary channel */
|
|
pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
|
|
|
|
/* look up tcon based on tid & uid */
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
|
|
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
|
|
|
|
spin_lock(&tcon->open_file_lock);
|
|
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
|
|
if (rsp->PersistentFid !=
|
|
cfile->fid.persistent_fid ||
|
|
rsp->VolatileFid !=
|
|
cfile->fid.volatile_fid)
|
|
continue;
|
|
|
|
cifs_dbg(FYI, "file id match, oplock break\n");
|
|
cifs_stats_inc(
|
|
&tcon->stats.cifs_stats.num_oplock_brks);
|
|
cinode = CIFS_I(d_inode(cfile->dentry));
|
|
spin_lock(&cfile->file_info_lock);
|
|
if (!CIFS_CACHE_WRITE(cinode) &&
|
|
rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
|
|
cfile->oplock_break_cancelled = true;
|
|
else
|
|
cfile->oplock_break_cancelled = false;
|
|
|
|
set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
|
|
&cinode->flags);
|
|
|
|
cfile->oplock_epoch = 0;
|
|
cfile->oplock_level = rsp->OplockLevel;
|
|
|
|
spin_unlock(&cfile->file_info_lock);
|
|
|
|
cifs_queue_oplock_break(cfile);
|
|
|
|
spin_unlock(&tcon->open_file_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return true;
|
|
}
|
|
spin_unlock(&tcon->open_file_lock);
|
|
}
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_dbg(FYI, "No file id matched, oplock break ignored\n");
|
|
trace_smb3_oplock_not_found(0 /* no xid */, rsp->PersistentFid,
|
|
le32_to_cpu(rsp->hdr.Id.SyncId.TreeId),
|
|
le64_to_cpu(rsp->hdr.SessionId));
|
|
|
|
return true;
|
|
}
|
|
|
|
void
|
|
smb2_cancelled_close_fid(struct work_struct *work)
|
|
{
|
|
struct close_cancelled_open *cancelled = container_of(work,
|
|
struct close_cancelled_open, work);
|
|
struct cifs_tcon *tcon = cancelled->tcon;
|
|
int rc;
|
|
|
|
if (cancelled->mid)
|
|
cifs_tcon_dbg(VFS, "Close unmatched open for MID:%llu\n",
|
|
cancelled->mid);
|
|
else
|
|
cifs_tcon_dbg(VFS, "Close interrupted close\n");
|
|
|
|
rc = SMB2_close(0, tcon, cancelled->fid.persistent_fid,
|
|
cancelled->fid.volatile_fid);
|
|
if (rc)
|
|
cifs_tcon_dbg(VFS, "Close cancelled mid failed rc:%d\n", rc);
|
|
|
|
cifs_put_tcon(tcon);
|
|
kfree(cancelled);
|
|
}
|
|
|
|
/*
|
|
* Caller should already has an extra reference to @tcon
|
|
* This function is used to queue work to close a handle to prevent leaks
|
|
* on the server.
|
|
* We handle two cases. If an open was interrupted after we sent the
|
|
* SMB2_CREATE to the server but before we processed the reply, and second
|
|
* if a close was interrupted before we sent the SMB2_CLOSE to the server.
|
|
*/
|
|
static int
|
|
__smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid,
|
|
__u64 persistent_fid, __u64 volatile_fid)
|
|
{
|
|
struct close_cancelled_open *cancelled;
|
|
|
|
cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC);
|
|
if (!cancelled)
|
|
return -ENOMEM;
|
|
|
|
cancelled->fid.persistent_fid = persistent_fid;
|
|
cancelled->fid.volatile_fid = volatile_fid;
|
|
cancelled->tcon = tcon;
|
|
cancelled->cmd = cmd;
|
|
cancelled->mid = mid;
|
|
INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
|
|
WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,
|
|
__u64 volatile_fid)
|
|
{
|
|
int rc;
|
|
|
|
cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
if (tcon->tc_count <= 0) {
|
|
struct TCP_Server_Info *server = NULL;
|
|
|
|
WARN_ONCE(tcon->tc_count < 0, "tcon refcount is negative");
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
if (tcon->ses)
|
|
server = tcon->ses->server;
|
|
|
|
cifs_server_dbg(FYI, "tid=0x%x: tcon is closing, skipping async close retry of fid %llu %llu\n",
|
|
tcon->tid, persistent_fid, volatile_fid);
|
|
|
|
return 0;
|
|
}
|
|
tcon->tc_count++;
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
rc = __smb2_handle_cancelled_cmd(tcon, SMB2_CLOSE_HE, 0,
|
|
persistent_fid, volatile_fid);
|
|
if (rc)
|
|
cifs_put_tcon(tcon);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
smb2_handle_cancelled_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server)
|
|
{
|
|
struct smb2_hdr *hdr = mid->resp_buf;
|
|
struct smb2_create_rsp *rsp = mid->resp_buf;
|
|
struct cifs_tcon *tcon;
|
|
int rc;
|
|
|
|
if ((mid->optype & CIFS_CP_CREATE_CLOSE_OP) || hdr->Command != SMB2_CREATE ||
|
|
hdr->Status != STATUS_SUCCESS)
|
|
return 0;
|
|
|
|
tcon = smb2_find_smb_tcon(server, le64_to_cpu(hdr->SessionId),
|
|
le32_to_cpu(hdr->Id.SyncId.TreeId));
|
|
if (!tcon)
|
|
return -ENOENT;
|
|
|
|
rc = __smb2_handle_cancelled_cmd(tcon,
|
|
le16_to_cpu(hdr->Command),
|
|
le64_to_cpu(hdr->MessageId),
|
|
rsp->PersistentFileId,
|
|
rsp->VolatileFileId);
|
|
if (rc)
|
|
cifs_put_tcon(tcon);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smb311_update_preauth_hash - update @ses hash with the packet data in @iov
|
|
*
|
|
* Assumes @iov does not contain the rfc1002 length and iov[0] has the
|
|
* SMB2 header.
|
|
*
|
|
* @ses: server session structure
|
|
* @server: pointer to server info
|
|
* @iov: array containing the SMB request we will send to the server
|
|
* @nvec: number of array entries for the iov
|
|
*/
|
|
int
|
|
smb311_update_preauth_hash(struct cifs_ses *ses, struct TCP_Server_Info *server,
|
|
struct kvec *iov, int nvec)
|
|
{
|
|
int i, rc;
|
|
struct smb2_hdr *hdr;
|
|
struct shash_desc *sha512 = NULL;
|
|
|
|
hdr = (struct smb2_hdr *)iov[0].iov_base;
|
|
/* neg prot are always taken */
|
|
if (hdr->Command == SMB2_NEGOTIATE)
|
|
goto ok;
|
|
|
|
/*
|
|
* If we process a command which wasn't a negprot it means the
|
|
* neg prot was already done, so the server dialect was set
|
|
* and we can test it. Preauth requires 3.1.1 for now.
|
|
*/
|
|
if (server->dialect != SMB311_PROT_ID)
|
|
return 0;
|
|
|
|
if (hdr->Command != SMB2_SESSION_SETUP)
|
|
return 0;
|
|
|
|
/* skip last sess setup response */
|
|
if ((hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
|
|
&& (hdr->Status == NT_STATUS_OK
|
|
|| (hdr->Status !=
|
|
cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))))
|
|
return 0;
|
|
|
|
ok:
|
|
rc = smb311_crypto_shash_allocate(server);
|
|
if (rc)
|
|
return rc;
|
|
|
|
sha512 = server->secmech.sha512;
|
|
rc = crypto_shash_init(sha512);
|
|
if (rc) {
|
|
cifs_dbg(VFS, "%s: Could not init sha512 shash\n", __func__);
|
|
return rc;
|
|
}
|
|
|
|
rc = crypto_shash_update(sha512, ses->preauth_sha_hash,
|
|
SMB2_PREAUTH_HASH_SIZE);
|
|
if (rc) {
|
|
cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__);
|
|
return rc;
|
|
}
|
|
|
|
for (i = 0; i < nvec; i++) {
|
|
rc = crypto_shash_update(sha512, iov[i].iov_base, iov[i].iov_len);
|
|
if (rc) {
|
|
cifs_dbg(VFS, "%s: Could not update sha512 shash\n",
|
|
__func__);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
rc = crypto_shash_final(sha512, ses->preauth_sha_hash);
|
|
if (rc) {
|
|
cifs_dbg(VFS, "%s: Could not finalize sha512 shash\n",
|
|
__func__);
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|