retrieving CIFS ACLs when mounted with SMB2 fails dropping session

commit 83e3bc23ef9ce7c03b7b4e5d3d790246ea59db3e upstream.

The get/set ACL xattr support for CIFS ACLs attempts to send old
cifs dialect protocol requests even when mounted with SMB2 or later
dialects. Sending cifs requests on an smb2 session causes problems -
the server drops the session due to the illegal request.

This patch makes CIFS ACL operations protocol specific to fix that.

Attempting to query/set CIFS ACLs for SMB2 will now return
EOPNOTSUPP (until we add worker routines for sending query
ACL requests via SMB2) instead of sending invalid (cifs)
requests.

A separate followon patch will be needed to fix cifs_acl_to_fattr
(which takes a cifs specific u16 fid so can't be abstracted
to work with SMB2 until that is changed) and will be needed
to fix mount problems when "cifsacl" is specified on mount
with e.g. vers=2.1

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 51f5e0ee7237210c78166db95cec9b26c1611ed5..494b683496673178250fc84f0ffc7d3d34c8aa4e 100644 (file)
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -1027,15 +1027,30 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode,
        __u32 secdesclen = 0;
        struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */
        struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */
+       struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+       struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
+       struct cifs_tcon *tcon;
+
+       if (IS_ERR(tlink))
+               return PTR_ERR(tlink);
+       tcon = tlink_tcon(tlink);
 
        cifs_dbg(NOISY, "set ACL from mode for %s\n", path);
 
        /* Get the security descriptor */
-       pntsd = get_cifs_acl(CIFS_SB(inode->i_sb), inode, path, &secdesclen);
+
+       if (tcon->ses->server->ops->get_acl == NULL) {
+               cifs_put_tlink(tlink);
+               return -EOPNOTSUPP;
+       }
+
+       pntsd = tcon->ses->server->ops->get_acl(cifs_sb, inode, path,
+                                               &secdesclen);
        if (IS_ERR(pntsd)) {
                rc = PTR_ERR(pntsd);
                cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc);
-               goto out;
+               cifs_put_tlink(tlink);
+               return rc;
        }
 
        /*
@@ -1048,6 +1063,7 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode,
        pnntsd = kmalloc(secdesclen, GFP_KERNEL);
        if (!pnntsd) {
                kfree(pntsd);
+               cifs_put_tlink(tlink);
                return -ENOMEM;
        }
 
@@ -1056,14 +1072,18 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode,
 
        cifs_dbg(NOISY, "build_sec_desc rc: %d\n", rc);
 
+       if (tcon->ses->server->ops->set_acl == NULL)
+               rc = -EOPNOTSUPP;
+
        if (!rc) {
                /* Set the security descriptor */
-               rc = set_cifs_acl(pnntsd, secdesclen, inode, path, aclflag);
+               rc = tcon->ses->server->ops->set_acl(pnntsd, secdesclen, inode,
+                                                    path, aclflag);
                cifs_dbg(NOISY, "set_cifs_acl rc: %d\n", rc);
        }
+       cifs_put_tlink(tlink);
 
        kfree(pnntsd);
        kfree(pntsd);
-out:
        return rc;
 }

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index b448120c5229e8bb22a6eda152d9ca6dc6d514cc..db95dca335caedf927e68431bef75af49caf941b 100644 (file)
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -385,6 +385,10 @@ struct smb_version_operations {
        int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
                        const char *, const void *, const __u16,
                        const struct nls_table *, int);
+       struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
+                       const char *, u32 *);
+       int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
+                       int);
 };
 
 struct smb_version_values {

diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 2f33474ccabd6091f8ecf22681e59c7c036a9dac..e6ed0dc3071bd90a6ecb035f5e3dbaf08a10d9a0 100644 (file)
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -1007,6 +1007,10 @@ struct smb_version_operations smb1_operations = {
        .query_all_EAs = CIFSSMBQAllEAs,
        .set_EA = CIFSSMBSetEA,
 #endif /* CIFS_XATTR */
+#ifdef CONFIG_CIFS_ACL
+       .get_acl = get_cifs_acl,
+       .set_acl = set_cifs_acl,
+#endif /* CIFS_ACL */
 };
 
 struct smb_version_values smb1_values = {

diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index 95c43bb203353a65974a6cf5b24a0fe02c3c5c86..5ac836a86b1885d4e1766e831a1b56d3a263e277 100644 (file)
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -176,8 +176,12 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
                        rc = -ENOMEM;
                } else {
                        memcpy(pacl, ea_value, value_size);
-                       rc = set_cifs_acl(pacl, value_size,
-                               direntry->d_inode, full_path, CIFS_ACL_DACL);
+                       if (pTcon->ses->server->ops->set_acl)
+                               rc = pTcon->ses->server->ops->set_acl(pacl,
+                                               value_size, direntry->d_inode,
+                                               full_path, CIFS_ACL_DACL);
+                       else
+                               rc = -EOPNOTSUPP;
                        if (rc == 0) /* force revalidate of the inode */
                                CIFS_I(direntry->d_inode)->time = 0;
                        kfree(pacl);
@@ -323,8 +327,11 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
                        u32 acllen;
                        struct cifs_ntsd *pacl;
 
-                       pacl = get_cifs_acl(cifs_sb, direntry->d_inode,
-                                               full_path, &acllen);
+                       if (pTcon->ses->server->ops->get_acl == NULL)
+                               goto get_ea_exit; /* rc already EOPNOTSUPP */
+
+                       pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
+                                       direntry->d_inode, full_path, &acllen);
                        if (IS_ERR(pacl)) {
                                rc = PTR_ERR(pacl);
                                cifs_dbg(VFS, "%s: error %zd getting sec desc\n",