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-rw-r--r--fs/cifs/cifsfs.c1
-rw-r--r--fs/cifs/cifsglob.h5
-rw-r--r--fs/cifs/connect.c2
-rw-r--r--fs/cifs/file.c8
-rw-r--r--fs/cifs/smb1ops.c14
-rw-r--r--fs/cifs/smb2maperror.c2
-rw-r--r--fs/cifs/smb2ops.c77
-rw-r--r--fs/cifs/smb2pdu.c10
-rw-r--r--fs/cifs/smb2pdu.h14
9 files changed, 98 insertions, 35 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index f5fcd6360056..65d9771e49f9 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -303,6 +303,7 @@ cifs_alloc_inode(struct super_block *sb)
cifs_inode->uniqueid = 0;
cifs_inode->createtime = 0;
cifs_inode->epoch = 0;
+ spin_lock_init(&cifs_inode->open_file_lock);
generate_random_uuid(cifs_inode->lease_key);
/*
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 334ff5f9c3f3..4777b3c4a92c 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1377,6 +1377,7 @@ struct cifsInodeInfo {
struct rw_semaphore lock_sem; /* protect the fields above */
/* BB add in lists for dirty pages i.e. write caching info for oplock */
struct list_head openFileList;
+ spinlock_t open_file_lock; /* protects openFileList */
__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
unsigned int oplock; /* oplock/lease level we have */
unsigned int epoch; /* used to track lease state changes */
@@ -1780,10 +1781,14 @@ require use of the stronger protocol */
* tcp_ses_lock protects:
* list operations on tcp and SMB session lists
* tcon->open_file_lock protects the list of open files hanging off the tcon
+ * inode->open_file_lock protects the openFileList hanging off the inode
* cfile->file_info_lock protects counters and fields in cifs file struct
* f_owner.lock protects certain per file struct operations
* mapping->page_lock protects certain per page operations
*
+ * Note that the cifs_tcon.open_file_lock should be taken before
+ * not after the cifsInodeInfo.open_file_lock
+ *
* Semaphores
* ----------
* sesSem operations on smb session
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 8c4121da624e..8dd6637a3cbb 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -476,6 +476,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
spin_lock(&GlobalMid_Lock);
server->nr_targets = 1;
#ifdef CONFIG_CIFS_DFS_UPCALL
+ spin_unlock(&GlobalMid_Lock);
cifs_sb = find_super_by_tcp(server);
if (IS_ERR(cifs_sb)) {
rc = PTR_ERR(cifs_sb);
@@ -493,6 +494,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
}
cifs_dbg(FYI, "%s: will retry %d target(s)\n", __func__,
server->nr_targets);
+ spin_lock(&GlobalMid_Lock);
#endif
if (server->tcpStatus == CifsExiting) {
/* the demux thread will exit normally
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 06e27ac6d82c..97090693d182 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -338,10 +338,12 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
atomic_inc(&tcon->num_local_opens);
/* if readable file instance put first in list*/
+ spin_lock(&cinode->open_file_lock);
if (file->f_mode & FMODE_READ)
list_add(&cfile->flist, &cinode->openFileList);
else
list_add_tail(&cfile->flist, &cinode->openFileList);
+ spin_unlock(&cinode->open_file_lock);
spin_unlock(&tcon->open_file_lock);
if (fid->purge_cache)
@@ -413,7 +415,9 @@ void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_handler)
cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open);
/* remove it from the lists */
+ spin_lock(&cifsi->open_file_lock);
list_del(&cifs_file->flist);
+ spin_unlock(&cifsi->open_file_lock);
list_del(&cifs_file->tlist);
atomic_dec(&tcon->num_local_opens);
@@ -1950,9 +1954,9 @@ refind_writable:
return 0;
}
- spin_lock(&tcon->open_file_lock);
+ spin_lock(&cifs_inode->open_file_lock);
list_move_tail(&inv_file->flist, &cifs_inode->openFileList);
- spin_unlock(&tcon->open_file_lock);
+ spin_unlock(&cifs_inode->open_file_lock);
cifsFileInfo_put(inv_file);
++refind;
inv_file = NULL;
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index c4e75afa3258..9e430ae9314f 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -1,20 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* SMB1 (CIFS) version specific operations
*
* Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
- *
- * This library is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License v2 as published
- * by the Free Software Foundation.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
- * the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/pagemap.h>
diff --git a/fs/cifs/smb2maperror.c b/fs/cifs/smb2maperror.c
index e32c264e3adb..82ade16c9501 100644
--- a/fs/cifs/smb2maperror.c
+++ b/fs/cifs/smb2maperror.c
@@ -457,7 +457,7 @@ static const struct status_to_posix_error smb2_error_map_table[] = {
{STATUS_FILE_INVALID, -EIO, "STATUS_FILE_INVALID"},
{STATUS_ALLOTTED_SPACE_EXCEEDED, -EIO,
"STATUS_ALLOTTED_SPACE_EXCEEDED"},
- {STATUS_INSUFFICIENT_RESOURCES, -EREMOTEIO,
+ {STATUS_INSUFFICIENT_RESOURCES, -EAGAIN,
"STATUS_INSUFFICIENT_RESOURCES"},
{STATUS_DFS_EXIT_PATH_FOUND, -EIO, "STATUS_DFS_EXIT_PATH_FOUND"},
{STATUS_DEVICE_DATA_ERROR, -EIO, "STATUS_DEVICE_DATA_ERROR"},
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index e921e6511728..9fd56b0acd7e 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3,19 +3,6 @@
* SMB2 version specific operations
*
* Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
- *
- * This library is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License v2 as published
- * by the Free Software Foundation.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
- * the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/pagemap.h>
@@ -2385,6 +2372,41 @@ smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
kfree(dfs_rsp);
return rc;
}
+
+static int
+parse_reparse_symlink(struct reparse_symlink_data_buffer *symlink_buf,
+ u32 plen, char **target_path,
+ struct cifs_sb_info *cifs_sb)
+{
+ unsigned int sub_len;
+ unsigned int sub_offset;
+
+ /* We only handle Symbolic Link : MS-FSCC 2.1.2.4 */
+ if (le32_to_cpu(symlink_buf->ReparseTag) != IO_REPARSE_TAG_SYMLINK) {
+ cifs_dbg(VFS, "srv returned invalid symlink buffer\n");
+ return -EIO;
+ }
+
+ sub_offset = le16_to_cpu(symlink_buf->SubstituteNameOffset);
+ sub_len = le16_to_cpu(symlink_buf->SubstituteNameLength);
+ if (sub_offset + 20 > plen ||
+ sub_offset + sub_len + 20 > plen) {
+ cifs_dbg(VFS, "srv returned malformed symlink buffer\n");
+ return -EIO;
+ }
+
+ *target_path = cifs_strndup_from_utf16(
+ symlink_buf->PathBuffer + sub_offset,
+ sub_len, true, cifs_sb->local_nls);
+ if (!(*target_path))
+ return -ENOMEM;
+
+ convert_delimiter(*target_path, '/');
+ cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
+
+ return 0;
+}
+
#define SMB2_SYMLINK_STRUCT_SIZE \
(sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
@@ -2414,11 +2436,13 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
struct kvec close_iov[1];
struct smb2_create_rsp *create_rsp;
struct smb2_ioctl_rsp *ioctl_rsp;
- char *ioctl_buf;
+ struct reparse_data_buffer *reparse_buf;
u32 plen;
cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
+ *target_path = NULL;
+
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
@@ -2496,17 +2520,36 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
if ((rc == 0) && (is_reparse_point)) {
/* See MS-FSCC 2.3.23 */
- ioctl_buf = (char *)ioctl_rsp + le32_to_cpu(ioctl_rsp->OutputOffset);
+ reparse_buf = (struct reparse_data_buffer *)
+ ((char *)ioctl_rsp +
+ le32_to_cpu(ioctl_rsp->OutputOffset));
plen = le32_to_cpu(ioctl_rsp->OutputCount);
if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
rsp_iov[1].iov_len) {
- cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", plen);
+ cifs_dbg(VFS, "srv returned invalid ioctl len: %d\n",
+ plen);
+ rc = -EIO;
+ goto querty_exit;
+ }
+
+ if (plen < 8) {
+ cifs_dbg(VFS, "reparse buffer is too small. Must be "
+ "at least 8 bytes but was %d\n", plen);
+ rc = -EIO;
+ goto querty_exit;
+ }
+
+ if (plen < le16_to_cpu(reparse_buf->ReparseDataLength) + 8) {
+ cifs_dbg(VFS, "srv returned invalid reparse buf "
+ "length: %d\n", plen);
rc = -EIO;
goto querty_exit;
}
- /* Do stuff with ioctl_buf/plen */
+ rc = parse_reparse_symlink(
+ (struct reparse_symlink_data_buffer *)reparse_buf,
+ plen, target_path, cifs_sb);
goto querty_exit;
}
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 29b699d532ef..75311a8a68bf 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3114,9 +3114,14 @@ void smb2_reconnect_server(struct work_struct *work)
tcon_exist = true;
}
}
+ /*
+ * IPC has the same lifetime as its session and uses its
+ * refcount.
+ */
if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
tcon_exist = true;
+ ses->ses_count++;
}
}
/*
@@ -3135,7 +3140,10 @@ void smb2_reconnect_server(struct work_struct *work)
else
resched = true;
list_del_init(&tcon->rlist);
- cifs_put_tcon(tcon);
+ if (tcon->ipc)
+ cifs_put_smb_ses(tcon->ses);
+ else
+ cifs_put_tcon(tcon);
}
cifs_dbg(FYI, "Reconnecting tcons finished\n");
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index c7d5813bebd8..858353d20c39 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -914,7 +914,19 @@ struct reparse_mount_point_data_buffer {
__u8 PathBuffer[0]; /* Variable Length */
} __packed;
-/* See MS-FSCC 2.1.2.4 and cifspdu.h for struct reparse_symlink_data */
+#define SYMLINK_FLAG_RELATIVE 0x00000001
+
+struct reparse_symlink_data_buffer {
+ __le32 ReparseTag;
+ __le16 ReparseDataLength;
+ __u16 Reserved;
+ __le16 SubstituteNameOffset;
+ __le16 SubstituteNameLength;
+ __le16 PrintNameOffset;
+ __le16 PrintNameLength;
+ __le32 Flags;
+ __u8 PathBuffer[0]; /* Variable Length */
+} __packed;
/* See MS-FSCC 2.1.2.6 and cifspdu.h for struct reparse_posix_data */
generated by cgit (git 2.34.1) at 2024-05-28 05:16:41 +0000