smb: client: set correct id, uid and cruid for multiuser automounts

When uid, gid and cruid are not specified, we need to dynamically
set them into the filesystem context used for automounting otherwise
they'll end up reusing the values from the parent mount.

Fixes: 9fd29a5bae6e ("cifs: use fs_context for automounts")
Reported-by: Shane Nehring <snehring@iastate.edu>
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2259257
Cc: stable@vger.kernel.org # 6.2+
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/client/namespace.c b/fs/smb/client/namespace.c
index a6968573b775e7bdcab3df948908e9494f792027..4a517b280f2b79a2c1395a1c627b496def7392a7 100644 (file)
--- a/fs/smb/client/namespace.c
+++ b/fs/smb/client/namespace.c
@@ -168,6 +168,21 @@ static char *automount_fullpath(struct dentry *dentry, void *page)
        return s;
 }
 
+static void fs_context_set_ids(struct smb3_fs_context *ctx)
+{
+       kuid_t uid = current_fsuid();
+       kgid_t gid = current_fsgid();
+
+       if (ctx->multiuser) {
+               if (!ctx->uid_specified)
+                       ctx->linux_uid = uid;
+               if (!ctx->gid_specified)
+                       ctx->linux_gid = gid;
+       }
+       if (!ctx->cruid_specified)
+               ctx->cred_uid = uid;
+}
+
 /*
  * Create a vfsmount that we can automount
  */
@@ -205,6 +220,7 @@ static struct vfsmount *cifs_do_automount(struct path *path)
        tmp.leaf_fullpath = NULL;
        tmp.UNC = tmp.prepath = NULL;
        tmp.dfs_root_ses = NULL;
+       fs_context_set_ids(&tmp);
 
        rc = smb3_fs_context_dup(ctx, &tmp);
        if (rc) {