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-rw-r--r--fs/cifs/cifsglob.h3
-rw-r--r--fs/cifs/link.c13
-rw-r--r--fs/cifs/smb1ops.c9
-rw-r--r--fs/cifs/smb2ops.c110
4 files changed, 118 insertions, 17 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 561f1395eddd..33c251b408aa 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -355,7 +355,8 @@ struct smb_version_operations {
struct cifs_sb_info *);
/* query symlink target */
int (*query_symlink)(const unsigned int, struct cifs_tcon *,
- const char *, char **, struct cifs_sb_info *);
+ struct cifs_sb_info *, const char *,
+ char **, bool);
/* open a file for non-posix mounts */
int (*open)(const unsigned int, struct cifs_open_parms *,
__u32 *, FILE_ALL_INFO *);
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 62216dc8f9f5..b736acd3917b 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -648,9 +648,16 @@ cifs_get_link(struct dentry *direntry, struct inode *inode,
rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
&target_path);
- if (rc != 0 && server->ops->query_symlink)
- rc = server->ops->query_symlink(xid, tcon, full_path,
- &target_path, cifs_sb);
+ if (rc != 0 && server->ops->query_symlink) {
+ struct cifsInodeInfo *cifsi = CIFS_I(inode);
+ bool reparse_point = false;
+
+ if (cifsi->cifsAttrs & ATTR_REPARSE)
+ reparse_point = true;
+
+ rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
+ &target_path, reparse_point);
+ }
kfree(full_path);
free_xid(xid);
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index c711f1f39bf2..c4e75afa3258 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -950,8 +950,8 @@ cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
static int
cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
- const char *full_path, char **target_path,
- struct cifs_sb_info *cifs_sb)
+ struct cifs_sb_info *cifs_sb, const char *full_path,
+ char **target_path, bool is_reparse_point)
{
int rc;
int oplock = 0;
@@ -960,6 +960,11 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
+ if (is_reparse_point) {
+ cifs_dbg(VFS, "reparse points not handled for SMB1 symlinks\n");
+ return -EOPNOTSUPP;
+ }
+
/* Check for unix extensions */
if (cap_unix(tcon->ses)) {
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 4313cb04549e..a930c8965e5c 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -2390,46 +2390,129 @@ smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
static int
smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
- const char *full_path, char **target_path,
- struct cifs_sb_info *cifs_sb)
+ struct cifs_sb_info *cifs_sb, const char *full_path,
+ char **target_path, bool is_reparse_point)
{
int rc;
- __le16 *utf16_path;
+ __le16 *utf16_path = NULL;
__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
struct cifs_open_parms oparms;
struct cifs_fid fid;
struct kvec err_iov = {NULL, 0};
struct smb2_err_rsp *err_buf = NULL;
- int resp_buftype;
struct smb2_symlink_err_rsp *symlink;
unsigned int sub_len;
unsigned int sub_offset;
unsigned int print_len;
unsigned int print_offset;
+ int flags = 0;
+ struct smb_rqst rqst[3];
+ int resp_buftype[3];
+ struct kvec rsp_iov[3];
+ struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+ struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
+ struct kvec close_iov[1];
+ struct smb2_create_rsp *create_rsp;
+ struct smb2_ioctl_rsp *ioctl_rsp;
+ char *ioctl_buf;
+ u32 plen;
cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
+ if (smb3_encryption_required(tcon))
+ flags |= CIFS_TRANSFORM_REQ;
+
+ memset(rqst, 0, sizeof(rqst));
+ resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
+ memset(rsp_iov, 0, sizeof(rsp_iov));
+
utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
if (!utf16_path)
return -ENOMEM;
+ /* Open */
+ memset(&open_iov, 0, sizeof(open_iov));
+ rqst[0].rq_iov = open_iov;
+ rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+ memset(&oparms, 0, sizeof(oparms));
oparms.tcon = tcon;
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.disposition = FILE_OPEN;
+
if (backup_cred(cifs_sb))
oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
else
oparms.create_options = 0;
+ if (is_reparse_point)
+ oparms.create_options = OPEN_REPARSE_POINT;
+
oparms.fid = &fid;
oparms.reconnect = false;
- rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_iov,
- &resp_buftype);
- if (!rc)
- SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+ rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
+ if (rc)
+ goto querty_exit;
+ smb2_set_next_command(tcon, &rqst[0]);
+
+
+ /* IOCTL */
+ memset(&io_iov, 0, sizeof(io_iov));
+ rqst[1].rq_iov = io_iov;
+ rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
+
+ rc = SMB2_ioctl_init(tcon, &rqst[1], fid.persistent_fid,
+ fid.volatile_fid, FSCTL_GET_REPARSE_POINT,
+ true /* is_fctl */, NULL, 0, CIFSMaxBufSize);
+ if (rc)
+ goto querty_exit;
+
+ smb2_set_next_command(tcon, &rqst[1]);
+ smb2_set_related(&rqst[1]);
+
+
+ /* Close */
+ memset(&close_iov, 0, sizeof(close_iov));
+ rqst[2].rq_iov = close_iov;
+ rqst[2].rq_nvec = 1;
+
+ rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
+ if (rc)
+ goto querty_exit;
+
+ smb2_set_related(&rqst[2]);
+
+ rc = compound_send_recv(xid, tcon->ses, flags, 3, rqst,
+ resp_buftype, rsp_iov);
+
+ create_rsp = rsp_iov[0].iov_base;
+ if (create_rsp && create_rsp->sync_hdr.Status)
+ err_iov = rsp_iov[0];
+ ioctl_rsp = rsp_iov[1].iov_base;
+
+ /*
+ * Open was successful and we got an ioctl response.
+ */
+ if ((rc == 0) && (is_reparse_point)) {
+ /* See MS-FSCC 2.3.23 */
+
+ ioctl_buf = (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);
+ rc = -EIO;
+ goto querty_exit;
+ }
+
+ /* Do stuff with ioctl_buf/plen */
+ goto querty_exit;
+ }
+
if (!rc || !err_iov.iov_base) {
rc = -ENOENT;
- goto free_path;
+ goto querty_exit;
}
err_buf = err_iov.iov_base;
@@ -2469,9 +2552,14 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
querty_exit:
- free_rsp_buf(resp_buftype, err_buf);
- free_path:
+ cifs_dbg(FYI, "query symlink rc %d\n", rc);
kfree(utf16_path);
+ SMB2_open_free(&rqst[0]);
+ SMB2_ioctl_free(&rqst[1]);
+ SMB2_close_free(&rqst[2]);
+ free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+ free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
+ free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
return rc;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.