2021-06-18 05:31:49 +00:00
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// SPDX-License-Identifier: LGPL-2.1
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2011-06-08 11:51:07 +00:00
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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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2016-10-24 22:33:04 +00:00
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#include "smb2glob.h"
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2019-09-20 04:31:10 +00:00
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#include "nterr.h"
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2011-06-08 11:51:07 +00:00
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static int
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2021-11-04 23:39:01 +00:00
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check_smb2_hdr(struct smb2_hdr *shdr, __u64 mid)
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2011-06-08 11:51:07 +00:00
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{
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2016-10-24 22:33:04 +00:00
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__u64 wire_mid = le64_to_cpu(shdr->MessageId);
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2014-12-09 17:37:00 +00:00
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2011-06-08 11:51:07 +00:00
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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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2016-10-24 22:33:04 +00:00
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if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) &&
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2014-12-09 17:37:00 +00:00
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(mid == wire_mid)) {
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2016-10-24 22:33:04 +00:00
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if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
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2011-06-08 11:51:07 +00:00
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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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2016-10-24 22:33:04 +00:00
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if (shdr->Command == SMB2_OPLOCK_BREAK)
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2011-06-08 11:51:07 +00:00
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return 0;
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else
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2013-05-05 03:12:25 +00:00
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cifs_dbg(VFS, "Received Request not response\n");
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2011-06-08 11:51:07 +00:00
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}
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} else { /* bad signature or mid */
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2016-10-24 22:33:04 +00:00
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if (shdr->ProtocolId != SMB2_PROTO_NUMBER)
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2013-05-05 03:12:25 +00:00
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cifs_dbg(VFS, "Bad protocol string signature header %x\n",
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2016-10-24 22:33:04 +00:00
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le32_to_cpu(shdr->ProtocolId));
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2014-12-09 17:37:00 +00:00
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if (mid != wire_mid)
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2013-05-05 03:12:25 +00:00
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cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
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2014-12-09 17:37:00 +00:00
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mid, wire_mid);
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2011-06-08 11:51:07 +00:00
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}
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2014-12-09 17:37:00 +00:00
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cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid);
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2011-06-08 11:51:07 +00:00
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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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2014-12-10 23:41:15 +00:00
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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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2011-06-08 11:51:07 +00:00
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/* BB CHECK this ... not listed in documentation */
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2014-12-10 23:41:15 +00:00
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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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2011-06-08 11:51:07 +00:00
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/* BB FIXME can also be 44 for lease break */
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2014-12-10 23:41:15 +00:00
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/* SMB2_OPLOCK_BREAK */ cpu_to_le16(24)
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2011-06-08 11:51:07 +00:00
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};
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2021-11-04 23:39:01 +00:00
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#define SMB311_NEGPROT_BASE_SIZE (sizeof(struct smb2_hdr) + sizeof(struct smb2_negotiate_rsp))
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2020-12-09 07:12:35 +00:00
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2021-11-04 23:39:01 +00:00
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static __u32 get_neg_ctxt_len(struct smb2_hdr *hdr, __u32 len,
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2018-06-01 00:53:07 +00:00
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__u32 non_ctxlen)
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2018-04-08 21:14:31 +00:00
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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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2020-12-10 03:25:13 +00:00
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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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2018-04-08 21:14:31 +00:00
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nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
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2020-12-10 03:25:13 +00:00
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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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2020-12-09 07:12:35 +00:00
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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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2018-04-08 21:14:31 +00:00
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return 0;
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2020-12-09 07:12:35 +00:00
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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)
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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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2018-04-08 21:14:31 +00:00
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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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2020-04-15 05:42:53 +00:00
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pr_warn_once("negotiate context goes beyond end\n");
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2018-04-08 21:14:31 +00:00
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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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2011-06-08 11:51:07 +00:00
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int
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2018-05-30 21:43:34 +00:00
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smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr)
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2011-06-08 11:51:07 +00:00
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{
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2021-11-04 23:39:01 +00:00
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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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2015-12-18 19:05:30 +00:00
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__u64 mid;
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2011-06-08 11:51:07 +00:00
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__u32 clc_len; /* calculated length */
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int command;
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2021-11-04 23:39:01 +00:00
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int pdu_size = sizeof(struct smb2_pdu);
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int hdr_size = sizeof(struct smb2_hdr);
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2011-06-08 11:51:07 +00:00
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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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2016-10-24 22:33:04 +00:00
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if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
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2015-12-18 19:05:30 +00:00
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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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2022-03-31 21:55:41 +00:00
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struct cifs_ses *iter;
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2015-12-18 19:05:30 +00:00
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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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2022-03-31 21:55:41 +00:00
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list_for_each_entry(iter, &srvr->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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2015-12-18 19:05:30 +00:00
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break;
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2022-03-31 21:55:41 +00:00
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}
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2015-12-18 19:05:30 +00:00
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}
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spin_unlock(&cifs_tcp_ses_lock);
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2022-03-31 21:55:41 +00:00
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if (!ses) {
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2015-12-18 19:05:30 +00:00
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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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2016-10-24 22:33:04 +00:00
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mid = le64_to_cpu(shdr->MessageId);
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2018-05-30 21:43:34 +00:00
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if (len < pdu_size) {
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if ((len >= hdr_size)
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2016-10-24 22:33:04 +00:00
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&& (shdr->Status != 0)) {
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2011-06-08 11:51:07 +00:00
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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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2013-05-05 03:12:25 +00:00
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cifs_dbg(VFS, "Length less than SMB header size\n");
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2011-06-08 11:51:07 +00:00
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}
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return 1;
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}
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2018-06-01 00:53:07 +00:00
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if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) {
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2013-05-05 03:12:25 +00:00
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cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
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mid);
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2011-06-08 11:51:07 +00:00
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return 1;
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}
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2016-10-24 22:33:04 +00:00
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if (check_smb2_hdr(shdr, mid))
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2011-06-08 11:51:07 +00:00
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return 1;
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2016-10-24 22:33:04 +00:00
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if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
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2020-04-15 05:42:53 +00:00
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cifs_dbg(VFS, "Invalid structure size %u\n",
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2016-10-24 22:33:04 +00:00
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le16_to_cpu(shdr->StructureSize));
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2011-06-08 11:51:07 +00:00
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return 1;
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}
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2016-10-24 22:33:04 +00:00
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command = le16_to_cpu(shdr->Command);
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2011-06-08 11:51:07 +00:00
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if (command >= NUMBER_OF_SMB2_COMMANDS) {
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2020-04-15 05:42:53 +00:00
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cifs_dbg(VFS, "Invalid SMB2 command %d\n", command);
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2011-06-08 11:51:07 +00:00
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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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2016-10-24 22:33:04 +00:00
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if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
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2022-03-25 03:09:29 +00:00
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pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2_LE)) {
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2011-06-08 11:51:07 +00:00
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/* error packets have 9 byte structure size */
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2020-04-15 05:42:53 +00:00
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cifs_dbg(VFS, "Invalid response size %u for command %d\n",
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2013-05-05 03:12:25 +00:00
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le16_to_cpu(pdu->StructureSize2), command);
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2011-06-08 11:51:07 +00:00
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return 1;
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2016-10-24 22:33:04 +00:00
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} else if (command == SMB2_OPLOCK_BREAK_HE
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&& (shdr->Status == 0)
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2012-09-19 13:22:45 +00:00
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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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2020-04-15 05:42:53 +00:00
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cifs_dbg(VFS, "Invalid response size %d for oplock break\n",
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2013-05-05 03:12:25 +00:00
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le16_to_cpu(pdu->StructureSize2));
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2012-09-19 13:22:45 +00:00
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return 1;
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2011-06-08 11:51:07 +00:00
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}
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}
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2018-05-30 21:43:34 +00:00
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clc_len = smb2_calc_size(buf, srvr);
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2011-06-08 11:51:07 +00:00
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2018-04-08 21:14:31 +00:00
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if (shdr->Command == SMB2_NEGOTIATE)
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2018-06-01 00:53:07 +00:00
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clc_len += get_neg_ctxt_len(shdr, len, clc_len);
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2018-06-29 00:30:23 +00:00
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2018-05-30 21:43:34 +00:00
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if (len != clc_len) {
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cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
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clc_len, len, mid);
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2013-08-14 15:25:21 +00:00
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/* create failed on symlink */
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if (command == SMB2_CREATE_HE &&
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2016-10-24 22:33:04 +00:00
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shdr->Status == STATUS_STOPPED_ON_SYMLINK)
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2013-08-14 15:25:21 +00:00
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return 0;
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2012-09-18 23:20:33 +00:00
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/* Windows 7 server returns 24 bytes more */
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2018-05-30 21:43:34 +00:00
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if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
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2012-09-18 23:20:33 +00:00
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return 0;
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2014-08-16 04:49:01 +00:00
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/* server can return one byte more due to implied bcc[0] */
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2018-05-30 21:43:34 +00:00
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if (clc_len == len + 1)
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2012-07-26 21:20:41 +00:00
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return 0;
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2014-08-16 04:49:01 +00:00
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2018-08-22 02:19:24 +00:00
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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 (((clc_len + 7) & ~7) == len)
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return 0;
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2014-08-16 04:49:01 +00:00
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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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2018-08-29 14:22:22 +00:00
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* Some windows servers also pad up to 8 bytes when compounding.
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2014-08-16 04:49:01 +00:00
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*/
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2019-11-08 07:01:35 +00:00
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if (clc_len < len)
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2014-08-16 04:49:01 +00:00
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return 0;
|
2019-11-08 07:01:35 +00:00
|
|
|
|
2018-08-29 14:22:22 +00:00
|
|
|
pr_warn_once(
|
|
|
|
"srv rsp too short, len %d not %d. cmd:%d mid:%llu\n",
|
|
|
|
len, clc_len, command, mid);
|
2014-08-16 04:49:01 +00:00
|
|
|
|
2011-06-08 11:51:07 +00:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The size of the variable area depends on the offset and length fields
|
|
|
|
* located in different fields for various SMB2 responses. SMB2 responses
|
|
|
|
* with no variable length info, show an offset of zero for the offset field.
|
|
|
|
*/
|
|
|
|
static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
|
|
|
|
/* SMB2_NEGOTIATE */ true,
|
|
|
|
/* SMB2_SESSION_SETUP */ true,
|
|
|
|
/* SMB2_LOGOFF */ false,
|
|
|
|
/* SMB2_TREE_CONNECT */ false,
|
|
|
|
/* SMB2_TREE_DISCONNECT */ false,
|
|
|
|
/* SMB2_CREATE */ true,
|
|
|
|
/* SMB2_CLOSE */ false,
|
|
|
|
/* SMB2_FLUSH */ false,
|
|
|
|
/* SMB2_READ */ true,
|
|
|
|
/* SMB2_WRITE */ false,
|
|
|
|
/* SMB2_LOCK */ false,
|
|
|
|
/* SMB2_IOCTL */ true,
|
|
|
|
/* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
|
|
|
|
/* SMB2_ECHO */ false,
|
|
|
|
/* SMB2_QUERY_DIRECTORY */ true,
|
|
|
|
/* SMB2_CHANGE_NOTIFY */ true,
|
|
|
|
/* SMB2_QUERY_INFO */ true,
|
|
|
|
/* SMB2_SET_INFO */ false,
|
|
|
|
/* SMB2_OPLOCK_BREAK */ false
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Returns the pointer to the beginning of the data area. Length of the data
|
|
|
|
* area and the offset to it (from the beginning of the smb are also returned.
|
|
|
|
*/
|
2011-12-27 12:12:43 +00:00
|
|
|
char *
|
2021-11-04 23:39:01 +00:00
|
|
|
smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *shdr)
|
2011-06-08 11:51:07 +00:00
|
|
|
{
|
|
|
|
*off = 0;
|
|
|
|
*len = 0;
|
|
|
|
|
|
|
|
/* error responses do not have data area */
|
2016-10-24 22:33:04 +00:00
|
|
|
if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
|
2018-06-01 00:53:05 +00:00
|
|
|
(((struct smb2_err_rsp *)shdr)->StructureSize) ==
|
2022-03-25 03:09:29 +00:00
|
|
|
SMB2_ERROR_STRUCTURE_SIZE2_LE)
|
2011-06-08 11:51:07 +00:00
|
|
|
return NULL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Following commands have data areas so we have to get the location
|
|
|
|
* of the data buffer offset and data buffer length for the particular
|
|
|
|
* command.
|
|
|
|
*/
|
2016-10-24 22:33:04 +00:00
|
|
|
switch (shdr->Command) {
|
2011-06-08 11:51:07 +00:00
|
|
|
case SMB2_NEGOTIATE:
|
2011-12-27 12:12:43 +00:00
|
|
|
*off = le16_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
|
2011-12-27 12:12:43 +00:00
|
|
|
*len = le16_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
|
2011-12-27 12:12:43 +00:00
|
|
|
break;
|
2011-06-08 11:51:07 +00:00
|
|
|
case SMB2_SESSION_SETUP:
|
2011-12-27 12:22:00 +00:00
|
|
|
*off = le16_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
|
2011-12-27 12:22:00 +00:00
|
|
|
*len = le16_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
|
2011-12-27 12:22:00 +00:00
|
|
|
break;
|
2011-06-08 11:51:07 +00:00
|
|
|
case SMB2_CREATE:
|
2011-12-26 18:58:46 +00:00
|
|
|
*off = le32_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
|
2011-12-26 18:58:46 +00:00
|
|
|
*len = le32_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_create_rsp *)shdr)->CreateContextsLength);
|
2011-12-26 18:58:46 +00:00
|
|
|
break;
|
2011-06-08 11:51:07 +00:00
|
|
|
case SMB2_QUERY_INFO:
|
2011-12-29 13:06:33 +00:00
|
|
|
*off = le16_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
|
2011-12-29 13:06:33 +00:00
|
|
|
*len = le32_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
|
2011-12-29 13:06:33 +00:00
|
|
|
break;
|
|
|
|
case SMB2_READ:
|
2018-06-01 00:53:05 +00:00
|
|
|
/* TODO: is this a bug ? */
|
|
|
|
*off = ((struct smb2_read_rsp *)shdr)->DataOffset;
|
|
|
|
*len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
|
2012-09-18 23:20:29 +00:00
|
|
|
break;
|
2011-06-08 11:51:07 +00:00
|
|
|
case SMB2_QUERY_DIRECTORY:
|
2012-09-18 23:20:33 +00:00
|
|
|
*off = le16_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
|
2012-09-18 23:20:33 +00:00
|
|
|
*len = le32_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
|
2012-09-18 23:20:33 +00:00
|
|
|
break;
|
2011-06-08 11:51:07 +00:00
|
|
|
case SMB2_IOCTL:
|
2013-06-25 05:20:49 +00:00
|
|
|
*off = le32_to_cpu(
|
2018-06-01 00:53:05 +00:00
|
|
|
((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
|
|
|
|
*len = le32_to_cpu(
|
|
|
|
((struct smb2_ioctl_rsp *)shdr)->OutputCount);
|
2013-06-25 05:20:49 +00:00
|
|
|
break;
|
2011-06-08 11:51:07 +00:00
|
|
|
case SMB2_CHANGE_NOTIFY:
|
2020-07-08 04:43:39 +00:00
|
|
|
*off = le16_to_cpu(
|
|
|
|
((struct smb2_change_notify_rsp *)shdr)->OutputBufferOffset);
|
|
|
|
*len = le32_to_cpu(
|
|
|
|
((struct smb2_change_notify_rsp *)shdr)->OutputBufferLength);
|
|
|
|
break;
|
2011-06-08 11:51:07 +00:00
|
|
|
default:
|
2020-07-08 04:43:39 +00:00
|
|
|
cifs_dbg(VFS, "no length check for command %d\n", le16_to_cpu(shdr->Command));
|
2011-06-08 11:51:07 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Invalid length or offset probably means data area is invalid, but
|
|
|
|
* we have little choice but to ignore the data area in this case.
|
|
|
|
*/
|
|
|
|
if (*off > 4096) {
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
|
2011-06-08 11:51:07 +00:00
|
|
|
*len = 0;
|
|
|
|
*off = 0;
|
|
|
|
} else if (*off < 0) {
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
|
|
|
|
*off);
|
2011-06-08 11:51:07 +00:00
|
|
|
*off = 0;
|
|
|
|
*len = 0;
|
|
|
|
} else if (*len < 0) {
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
|
|
|
|
*len);
|
2011-06-08 11:51:07 +00:00
|
|
|
*len = 0;
|
|
|
|
} else if (*len > 128 * 1024) {
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
|
2011-06-08 11:51:07 +00:00
|
|
|
*len = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* return pointer to beginning of data area, ie offset from SMB start */
|
|
|
|
if ((*off != 0) && (*len != 0))
|
2016-10-24 22:33:04 +00:00
|
|
|
return (char *)shdr + *off;
|
2011-06-08 11:51:07 +00:00
|
|
|
else
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Calculate the size of the SMB message based on the fixed header
|
|
|
|
* portion, the number of word parameters and the data portion of the message.
|
|
|
|
*/
|
|
|
|
unsigned int
|
2018-04-22 21:30:12 +00:00
|
|
|
smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
|
2011-06-08 11:51:07 +00:00
|
|
|
{
|
2021-11-04 23:39:01 +00:00
|
|
|
struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
|
|
|
|
struct smb2_hdr *shdr = &pdu->hdr;
|
2011-06-08 11:51:07 +00:00
|
|
|
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 */
|
2018-06-01 00:53:07 +00:00
|
|
|
int len = le16_to_cpu(shdr->StructureSize);
|
2011-06-08 11:51:07 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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);
|
|
|
|
|
2016-10-24 22:33:04 +00:00
|
|
|
if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
|
2011-06-08 11:51:07 +00:00
|
|
|
goto calc_size_exit;
|
|
|
|
|
2018-06-01 00:53:05 +00:00
|
|
|
smb2_get_data_area_len(&offset, &data_length, shdr);
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
|
2011-06-08 11:51:07 +00:00
|
|
|
|
|
|
|
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,
|
2018-06-01 00:53:04 +00:00
|
|
|
* so we must add one to the calculation.
|
2011-06-08 11:51:07 +00:00
|
|
|
*/
|
2018-06-01 00:53:07 +00:00
|
|
|
if (offset + 1 < len) {
|
|
|
|
cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
|
|
|
|
offset + 1, len);
|
2011-06-08 11:51:07 +00:00
|
|
|
data_length = 0;
|
|
|
|
} else {
|
2018-06-01 00:53:07 +00:00
|
|
|
len = offset + data_length;
|
2011-06-08 11:51:07 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
calc_size_exit:
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(FYI, "SMB2 len %d\n", len);
|
2011-06-08 11:51:07 +00:00
|
|
|
return len;
|
|
|
|
}
|
2011-12-26 18:58:46 +00:00
|
|
|
|
|
|
|
/* 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;
|
2014-09-25 19:01:34 +00:00
|
|
|
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;
|
2011-12-26 18:58:46 +00:00
|
|
|
|
|
|
|
/* Windows doesn't allow paths beginning with \ */
|
|
|
|
if (from[0] == '\\')
|
|
|
|
start_of_path = from + 1;
|
2018-06-29 00:30:23 +00:00
|
|
|
|
2018-06-01 00:16:54 +00:00
|
|
|
/* SMB311 POSIX extensions paths do not include leading slash */
|
2018-06-04 20:29:35 +00:00
|
|
|
else if (cifs_sb_master_tlink(cifs_sb) &&
|
2018-06-15 03:30:56 +00:00
|
|
|
cifs_sb_master_tcon(cifs_sb)->posix_extensions &&
|
|
|
|
(from[0] == '/')) {
|
2018-06-01 00:16:54 +00:00
|
|
|
start_of_path = from + 1;
|
2018-06-29 00:30:23 +00:00
|
|
|
} else
|
2011-12-26 18:58:46 +00:00
|
|
|
start_of_path = from;
|
2018-06-01 00:16:54 +00:00
|
|
|
|
2011-12-26 18:58:46 +00:00
|
|
|
to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
|
2014-09-25 19:01:34 +00:00
|
|
|
cifs_sb->local_nls, map_type);
|
2011-12-26 18:58:46 +00:00
|
|
|
return to;
|
|
|
|
}
|
2012-09-18 23:20:33 +00:00
|
|
|
|
2012-09-19 13:22:45 +00:00
|
|
|
__le32
|
|
|
|
smb2_get_lease_state(struct cifsInodeInfo *cinode)
|
|
|
|
{
|
2013-09-05 12:11:28 +00:00
|
|
|
__le32 lease = 0;
|
2012-09-19 13:22:45 +00:00
|
|
|
|
2013-09-05 12:11:28 +00:00
|
|
|
if (CIFS_CACHE_WRITE(cinode))
|
2022-03-25 03:09:29 +00:00
|
|
|
lease |= SMB2_LEASE_WRITE_CACHING_LE;
|
2013-09-05 12:11:28 +00:00
|
|
|
if (CIFS_CACHE_HANDLE(cinode))
|
2022-03-25 03:09:29 +00:00
|
|
|
lease |= SMB2_LEASE_HANDLE_CACHING_LE;
|
2013-09-05 12:11:28 +00:00
|
|
|
if (CIFS_CACHE_READ(cinode))
|
2022-03-25 03:09:29 +00:00
|
|
|
lease |= SMB2_LEASE_READ_CACHING_LE;
|
2013-09-05 12:11:28 +00:00
|
|
|
return lease;
|
2012-09-19 13:22:45 +00:00
|
|
|
}
|
|
|
|
|
2012-09-19 13:22:45 +00:00
|
|
|
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);
|
2018-06-13 20:48:35 +00:00
|
|
|
int rc = 0;
|
2012-09-19 13:22:45 +00:00
|
|
|
|
|
|
|
rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
|
|
|
|
lw->lease_state);
|
2018-06-13 20:48:35 +00:00
|
|
|
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(FYI, "Lease release rc %d\n", rc);
|
2012-09-19 13:22:45 +00:00
|
|
|
cifs_put_tlink(lw->tlink);
|
|
|
|
kfree(lw);
|
|
|
|
}
|
|
|
|
|
2020-07-10 05:01:16 +00:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2012-09-19 13:22:45 +00:00
|
|
|
static bool
|
2020-07-10 05:01:16 +00:00
|
|
|
smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp)
|
2013-09-05 11:00:07 +00:00
|
|
|
{
|
|
|
|
__u8 lease_state;
|
|
|
|
struct cifsFileInfo *cfile;
|
|
|
|
struct cifsInodeInfo *cinode;
|
|
|
|
int ack_req = le32_to_cpu(rsp->Flags &
|
|
|
|
SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
|
|
|
|
|
2013-09-05 12:11:28 +00:00
|
|
|
lease_state = le32_to_cpu(rsp->NewLeaseState);
|
2013-09-05 11:00:07 +00:00
|
|
|
|
2021-06-18 04:02:32 +00:00
|
|
|
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
|
2015-03-17 22:25:59 +00:00
|
|
|
cinode = CIFS_I(d_inode(cfile->dentry));
|
2013-09-05 11:00:07 +00:00
|
|
|
|
|
|
|
if (memcmp(cinode->lease_key, rsp->LeaseKey,
|
|
|
|
SMB2_LEASE_KEY_SIZE))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
cifs_dbg(FYI, "found in the open list\n");
|
2014-08-03 02:16:48 +00:00
|
|
|
cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
|
2019-10-29 23:51:19 +00:00
|
|
|
lease_state);
|
2013-09-05 11:00:07 +00:00
|
|
|
|
|
|
|
if (ack_req)
|
|
|
|
cfile->oplock_break_cancelled = false;
|
|
|
|
else
|
|
|
|
cfile->oplock_break_cancelled = true;
|
|
|
|
|
2019-02-13 23:43:08 +00:00
|
|
|
set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
|
|
|
|
|
2019-10-29 23:51:19 +00:00
|
|
|
cfile->oplock_epoch = le16_to_cpu(rsp->Epoch);
|
|
|
|
cfile->oplock_level = lease_state;
|
2019-02-13 23:43:08 +00:00
|
|
|
|
2019-03-29 09:49:12 +00:00
|
|
|
cifs_queue_oplock_break(cfile);
|
2013-09-05 11:00:07 +00:00
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2020-07-10 05:01:16 +00:00
|
|
|
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;
|
|
|
|
|
2013-09-05 11:00:07 +00:00
|
|
|
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) {
|
2020-07-10 05:01:16 +00:00
|
|
|
found = open;
|
2013-09-05 11:00:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
cifs_dbg(FYI, "found in the pending open list\n");
|
2014-08-03 02:16:48 +00:00
|
|
|
cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
|
2019-10-29 23:51:19 +00:00
|
|
|
lease_state);
|
2013-09-05 11:00:07 +00:00
|
|
|
|
|
|
|
open->oplock = lease_state;
|
|
|
|
}
|
2018-06-13 20:48:35 +00:00
|
|
|
|
2013-09-05 11:00:07 +00:00
|
|
|
return found;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool
|
|
|
|
smb2_is_valid_lease_break(char *buffer)
|
2012-09-19 13:22:45 +00:00
|
|
|
{
|
|
|
|
struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
|
2013-09-05 11:00:07 +00:00
|
|
|
struct TCP_Server_Info *server;
|
2012-09-19 13:22:45 +00:00
|
|
|
struct cifs_ses *ses;
|
|
|
|
struct cifs_tcon *tcon;
|
2020-07-10 05:01:16 +00:00
|
|
|
struct cifs_pending_open *open;
|
2012-09-19 13:22:45 +00:00
|
|
|
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(FYI, "Checking for lease break\n");
|
2012-09-19 13:22:45 +00:00
|
|
|
|
|
|
|
/* look up tcon based on tid & uid */
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
2021-06-18 04:02:32 +00:00
|
|
|
list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
|
|
|
|
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
|
|
|
|
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
|
2016-09-22 23:58:16 +00:00
|
|
|
spin_lock(&tcon->open_file_lock);
|
2013-09-05 11:00:07 +00:00
|
|
|
cifs_stats_inc(
|
|
|
|
&tcon->stats.cifs_stats.num_oplock_brks);
|
2020-07-10 05:01:16 +00:00
|
|
|
if (smb2_tcon_has_lease(tcon, rsp)) {
|
2016-09-22 23:58:16 +00:00
|
|
|
spin_unlock(&tcon->open_file_lock);
|
2013-09-05 11:00:07 +00:00
|
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
return true;
|
2012-09-19 13:22:45 +00:00
|
|
|
}
|
2020-07-10 05:01:16 +00:00
|
|
|
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;
|
|
|
|
}
|
2016-09-22 23:58:16 +00:00
|
|
|
spin_unlock(&tcon->open_file_lock);
|
2018-06-13 20:48:35 +00:00
|
|
|
|
|
|
|
if (tcon->crfid.is_valid &&
|
|
|
|
!memcmp(rsp->LeaseKey,
|
|
|
|
tcon->crfid.fid->lease_key,
|
|
|
|
SMB2_LEASE_KEY_SIZE)) {
|
2021-03-08 23:07:33 +00:00
|
|
|
tcon->crfid.time = 0;
|
2018-06-13 20:48:35 +00:00
|
|
|
INIT_WORK(&tcon->crfid.lease_break,
|
|
|
|
smb2_cached_lease_break);
|
|
|
|
queue_work(cifsiod_wq,
|
|
|
|
&tcon->crfid.lease_break);
|
|
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
return true;
|
|
|
|
}
|
2012-09-19 13:22:45 +00:00
|
|
|
}
|
2012-09-19 13:22:45 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
|
2012-09-19 13:22:45 +00:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2012-09-18 23:20:33 +00:00
|
|
|
bool
|
|
|
|
smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
|
|
|
|
{
|
2018-06-01 00:53:03 +00:00
|
|
|
struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
|
2012-09-18 23:20:33 +00:00
|
|
|
struct cifs_ses *ses;
|
|
|
|
struct cifs_tcon *tcon;
|
|
|
|
struct cifsInodeInfo *cinode;
|
|
|
|
struct cifsFileInfo *cfile;
|
|
|
|
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(FYI, "Checking for oplock break\n");
|
2012-09-18 23:20:33 +00:00
|
|
|
|
2021-11-04 23:39:01 +00:00
|
|
|
if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
|
2012-09-18 23:20:33 +00:00
|
|
|
return false;
|
|
|
|
|
2012-09-19 16:19:39 +00:00
|
|
|
if (rsp->StructureSize !=
|
2012-09-18 23:20:33 +00:00
|
|
|
smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
|
2012-09-19 13:22:45 +00:00
|
|
|
if (le16_to_cpu(rsp->StructureSize) == 44)
|
2013-09-05 11:00:07 +00:00
|
|
|
return smb2_is_valid_lease_break(buffer);
|
2012-09-19 13:22:45 +00:00
|
|
|
else
|
|
|
|
return false;
|
2012-09-18 23:20:33 +00:00
|
|
|
}
|
|
|
|
|
2014-08-03 02:16:48 +00:00
|
|
|
cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
|
2012-09-18 23:20:33 +00:00
|
|
|
|
|
|
|
/* look up tcon based on tid & uid */
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
2021-06-18 04:02:32 +00:00
|
|
|
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
|
|
|
|
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
|
2012-09-18 23:20:33 +00:00
|
|
|
|
2016-09-22 23:58:16 +00:00
|
|
|
spin_lock(&tcon->open_file_lock);
|
2021-06-18 04:02:32 +00:00
|
|
|
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
|
2012-09-18 23:20:33 +00:00
|
|
|
if (rsp->PersistentFid !=
|
|
|
|
cfile->fid.persistent_fid ||
|
|
|
|
rsp->VolatileFid !=
|
|
|
|
cfile->fid.volatile_fid)
|
|
|
|
continue;
|
|
|
|
|
2013-05-05 03:12:25 +00:00
|
|
|
cifs_dbg(FYI, "file id match, oplock break\n");
|
2019-10-31 21:18:57 +00:00
|
|
|
cifs_stats_inc(
|
|
|
|
&tcon->stats.cifs_stats.num_oplock_brks);
|
2015-03-17 22:25:59 +00:00
|
|
|
cinode = CIFS_I(d_inode(cfile->dentry));
|
2016-09-22 23:58:16 +00:00
|
|
|
spin_lock(&cfile->file_info_lock);
|
2013-09-05 09:01:06 +00:00
|
|
|
if (!CIFS_CACHE_WRITE(cinode) &&
|
2012-09-18 23:20:33 +00:00
|
|
|
rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
|
|
|
|
cfile->oplock_break_cancelled = true;
|
|
|
|
else
|
|
|
|
cfile->oplock_break_cancelled = false;
|
|
|
|
|
2014-03-11 16:11:47 +00:00
|
|
|
set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
|
|
|
|
&cinode->flags);
|
|
|
|
|
2019-10-29 23:51:19 +00:00
|
|
|
cfile->oplock_epoch = 0;
|
|
|
|
cfile->oplock_level = rsp->OplockLevel;
|
|
|
|
|
2016-09-22 23:58:16 +00:00
|
|
|
spin_unlock(&cfile->file_info_lock);
|
2019-03-29 09:49:12 +00:00
|
|
|
|
|
|
|
cifs_queue_oplock_break(cfile);
|
2012-09-18 23:20:33 +00:00
|
|
|
|
2016-09-22 23:58:16 +00:00
|
|
|
spin_unlock(&tcon->open_file_lock);
|
2012-09-18 23:20:33 +00:00
|
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
return true;
|
|
|
|
}
|
2016-09-22 23:58:16 +00:00
|
|
|
spin_unlock(&tcon->open_file_lock);
|
2012-09-18 23:20:33 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
2021-03-19 13:57:11 +00:00
|
|
|
cifs_dbg(FYI, "No file id matched, oplock break ignored\n");
|
|
|
|
return true;
|
2012-09-18 23:20:33 +00:00
|
|
|
}
|
2017-03-03 23:41:38 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
smb2_cancelled_close_fid(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct close_cancelled_open *cancelled = container_of(work,
|
|
|
|
struct close_cancelled_open, work);
|
2019-11-14 18:32:12 +00:00
|
|
|
struct cifs_tcon *tcon = cancelled->tcon;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
if (cancelled->mid)
|
2021-03-08 15:00:47 +00:00
|
|
|
cifs_tcon_dbg(VFS, "Close unmatched open for MID:%llu\n",
|
2019-11-14 18:32:12 +00:00
|
|
|
cancelled->mid);
|
|
|
|
else
|
|
|
|
cifs_tcon_dbg(VFS, "Close interrupted close\n");
|
2017-03-03 23:41:38 +00:00
|
|
|
|
2019-11-14 18:32:12 +00:00
|
|
|
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);
|
2017-03-03 23:41:38 +00:00
|
|
|
|
2019-11-14 18:32:12 +00:00
|
|
|
cifs_put_tcon(tcon);
|
2017-03-03 23:41:38 +00:00
|
|
|
kfree(cancelled);
|
|
|
|
}
|
|
|
|
|
2019-11-14 18:32:12 +00:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
2019-11-21 19:35:12 +00:00
|
|
|
static int
|
2019-11-14 18:32:12 +00:00
|
|
|
__smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid,
|
|
|
|
__u64 persistent_fid, __u64 volatile_fid)
|
2019-11-21 19:35:12 +00:00
|
|
|
{
|
|
|
|
struct close_cancelled_open *cancelled;
|
|
|
|
|
2020-01-13 20:46:59 +00:00
|
|
|
cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC);
|
2019-11-21 19:35:12 +00:00
|
|
|
if (!cancelled)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
cancelled->fid.persistent_fid = persistent_fid;
|
|
|
|
cancelled->fid.volatile_fid = volatile_fid;
|
|
|
|
cancelled->tcon = tcon;
|
2019-11-14 18:32:12 +00:00
|
|
|
cancelled->cmd = cmd;
|
|
|
|
cancelled->mid = mid;
|
2019-11-21 19:35:12 +00:00
|
|
|
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);
|
cifs: ignore cached share root handle closing errors
Fix tcon use-after-free and NULL ptr deref.
Customer system crashes with the following kernel log:
[462233.169868] CIFS VFS: Cancelling wait for mid 4894753 cmd: 14 => a QUERY DIR
[462233.228045] CIFS VFS: cifs_put_smb_ses: Session Logoff failure rc=-4
[462233.305922] CIFS VFS: cifs_put_smb_ses: Session Logoff failure rc=-4
[462233.306205] CIFS VFS: cifs_put_smb_ses: Session Logoff failure rc=-4
[462233.347060] CIFS VFS: cifs_put_smb_ses: Session Logoff failure rc=-4
[462233.347107] CIFS VFS: Close unmatched open
[462233.347113] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
...
[exception RIP: cifs_put_tcon+0xa0] (this is doing tcon->ses->server)
#6 [...] smb2_cancelled_close_fid at ... [cifs]
#7 [...] process_one_work at ...
#8 [...] worker_thread at ...
#9 [...] kthread at ...
The most likely explanation we have is:
* When we put the last reference of a tcon (refcount=0), we close the
cached share root handle.
* If closing a handle is interrupted, SMB2_close() will
queue a SMB2_close() in a work thread.
* The queued object keeps a tcon ref so we bump the tcon
refcount, jumping from 0 to 1.
* We reach the end of cifs_put_tcon(), we free the tcon object despite
it now having a refcount of 1.
* The queued work now runs, but the tcon, ses & server was freed in
the meantime resulting in a crash.
THREAD 1
========
cifs_put_tcon => tcon refcount reach 0
SMB2_tdis
close_shroot_lease
close_shroot_lease_locked => if cached root has lease && refcount = 0
smb2_close_cached_fid => if cached root valid
SMB2_close => retry close in a thread if interrupted
smb2_handle_cancelled_close
__smb2_handle_cancelled_close => !! tcon refcount bump 0 => 1 !!
INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
queue_work(cifsiod_wq, &cancelled->work) => queue work
tconInfoFree(tcon); ==> freed!
cifs_put_smb_ses(ses); ==> freed!
THREAD 2 (workqueue)
========
smb2_cancelled_close_fid
SMB2_close(0, cancelled->tcon, ...); => use-after-free of tcon
cifs_put_tcon(cancelled->tcon); => tcon refcount reach 0 second time
*CRASH*
Fixes: d9191319358d ("CIFS: Close cached root handle only if it has a lease")
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2020-04-07 09:49:55 +00:00
|
|
|
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=%u: tcon is closing, skipping async close retry of fid %llu %llu\n",
|
|
|
|
tcon->tid, persistent_fid, volatile_fid);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2019-11-21 19:35:12 +00:00
|
|
|
tcon->tc_count++;
|
|
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
|
2019-11-14 18:32:12 +00:00
|
|
|
rc = __smb2_handle_cancelled_cmd(tcon, SMB2_CLOSE_HE, 0,
|
|
|
|
persistent_fid, volatile_fid);
|
2019-11-21 19:35:12 +00:00
|
|
|
if (rc)
|
|
|
|
cifs_put_tcon(tcon);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2017-03-03 23:41:38 +00:00
|
|
|
int
|
2021-03-08 15:00:50 +00:00
|
|
|
smb2_handle_cancelled_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server)
|
2017-03-03 23:41:38 +00:00
|
|
|
{
|
2021-11-04 23:39:01 +00:00
|
|
|
struct smb2_hdr *hdr = mid->resp_buf;
|
2021-03-08 15:00:50 +00:00
|
|
|
struct smb2_create_rsp *rsp = mid->resp_buf;
|
2017-03-03 23:41:38 +00:00
|
|
|
struct cifs_tcon *tcon;
|
2019-11-21 19:35:12 +00:00
|
|
|
int rc;
|
2017-03-03 23:41:38 +00:00
|
|
|
|
2021-11-04 23:39:01 +00:00
|
|
|
if ((mid->optype & CIFS_CP_CREATE_CLOSE_OP) || hdr->Command != SMB2_CREATE ||
|
|
|
|
hdr->Status != STATUS_SUCCESS)
|
2017-03-03 23:41:38 +00:00
|
|
|
return 0;
|
|
|
|
|
2021-11-04 23:39:01 +00:00
|
|
|
tcon = smb2_find_smb_tcon(server, le64_to_cpu(hdr->SessionId),
|
|
|
|
le32_to_cpu(hdr->Id.SyncId.TreeId));
|
2019-11-21 19:35:12 +00:00
|
|
|
if (!tcon)
|
2017-03-03 23:41:38 +00:00
|
|
|
return -ENOENT;
|
|
|
|
|
2019-11-14 18:32:12 +00:00
|
|
|
rc = __smb2_handle_cancelled_cmd(tcon,
|
2021-11-04 23:39:01 +00:00
|
|
|
le16_to_cpu(hdr->Command),
|
|
|
|
le64_to_cpu(hdr->MessageId),
|
2022-03-21 16:08:25 +00:00
|
|
|
rsp->PersistentFileId,
|
|
|
|
rsp->VolatileFileId);
|
2019-11-21 19:35:12 +00:00
|
|
|
if (rc)
|
|
|
|
cifs_put_tcon(tcon);
|
2017-03-03 23:41:38 +00:00
|
|
|
|
2019-11-21 19:35:12 +00:00
|
|
|
return rc;
|
2017-03-03 23:41:38 +00:00
|
|
|
}
|
2018-02-16 18:19:29 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
2020-12-12 18:08:58 +00:00
|
|
|
*
|
|
|
|
* @ses: server session structure
|
2022-01-05 09:39:09 +00:00
|
|
|
* @server: pointer to server info
|
2020-12-12 18:08:58 +00:00
|
|
|
* @iov: array containing the SMB request we will send to the server
|
|
|
|
* @nvec: number of array entries for the iov
|
2018-02-16 18:19:29 +00:00
|
|
|
*/
|
|
|
|
int
|
2021-07-19 13:54:16 +00:00
|
|
|
smb311_update_preauth_hash(struct cifs_ses *ses, struct TCP_Server_Info *server,
|
|
|
|
struct kvec *iov, int nvec)
|
2018-02-16 18:19:29 +00:00
|
|
|
{
|
|
|
|
int i, rc;
|
|
|
|
struct sdesc *d;
|
2021-11-04 23:39:01 +00:00
|
|
|
struct smb2_hdr *hdr;
|
2018-02-16 18:19:29 +00:00
|
|
|
|
2021-11-04 23:39:01 +00:00
|
|
|
hdr = (struct smb2_hdr *)iov[0].iov_base;
|
2019-09-20 04:31:10 +00:00
|
|
|
/* neg prot are always taken */
|
|
|
|
if (hdr->Command == SMB2_NEGOTIATE)
|
|
|
|
goto ok;
|
2018-02-16 18:19:29 +00:00
|
|
|
|
2019-09-20 04:31:10 +00:00
|
|
|
/*
|
|
|
|
* 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;
|
2018-02-16 18:19:29 +00:00
|
|
|
|
2019-09-20 04:31:10 +00:00
|
|
|
ok:
|
|
|
|
rc = smb311_crypto_shash_allocate(server);
|
2018-02-16 18:19:29 +00:00
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
2019-09-20 04:31:10 +00:00
|
|
|
d = server->secmech.sdescsha512;
|
2018-02-16 18:19:29 +00:00
|
|
|
rc = crypto_shash_init(&d->shash);
|
|
|
|
if (rc) {
|
2020-04-15 05:42:53 +00:00
|
|
|
cifs_dbg(VFS, "%s: Could not init sha512 shash\n", __func__);
|
2018-02-16 18:19:29 +00:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
|
|
|
|
SMB2_PREAUTH_HASH_SIZE);
|
|
|
|
if (rc) {
|
2020-04-15 05:42:53 +00:00
|
|
|
cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__);
|
2018-02-16 18:19:29 +00:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < nvec; i++) {
|
|
|
|
rc = crypto_shash_update(&d->shash,
|
|
|
|
iov[i].iov_base, iov[i].iov_len);
|
|
|
|
if (rc) {
|
2020-04-15 05:42:53 +00:00
|
|
|
cifs_dbg(VFS, "%s: Could not update sha512 shash\n",
|
2018-02-16 18:19:29 +00:00
|
|
|
__func__);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
|
|
|
|
if (rc) {
|
2020-04-15 05:42:53 +00:00
|
|
|
cifs_dbg(VFS, "%s: Could not finalize sha512 shash\n",
|
2018-02-16 18:19:29 +00:00
|
|
|
__func__);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|