Re: [PATCH] hfs: return -EPERM for unsupported setattr changes

[Viacheslav Dubeyko <slava@dubeyko.com>]

On Wed, 2026-09-16 at 19:40 -0300, Davy Felipe wrote:
> hfs_inode_setattr() rejects unsupported UID, GID and mode changes,
> but returns the value stored in error when the filesystem is not
> mounted with the quiet option.
> 
> At this point error is zero, as execution has already passed a
> successful setattr_prepare() call. As a result, unsupported attribute
> changes are incorrectly reported to userspace as successful even
> though the inode remains unchanged.
> 
> Return -EPERM for these operations while preserving the existing
> behavior for quiet mounts.
> 
> A chown test on an HFS image reproduces the problem. Without the fix,
> chown 1234:1234 returns success while ownership remains 0:0. With the
> fix, the same operation fails with EPERM and ownership remains
> unchanged.
> 
> Signed-off-by: Davy Felipe <davyfelipe34@gmail.com>
> ---
>  fs/hfs/inode.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
> index 2aef3c36a150..cce3a7bb95e9 100644
> --- a/fs/hfs/inode.c
> +++ b/fs/hfs/inode.c
> @@ -663,7 +663,7 @@ int hfs_inode_setattr(struct mnt_idmap *idmap,
> struct dentry *dentry,
>  	     ((S_ISDIR(inode->i_mode) &&
>  	       (attr->ia_mode != inode->i_mode)) ||
>  	      (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
> -		return hsb->s_quiet ? 0 : error;
> +		return hsb->s_quiet ? 0 : -EPERM;
>  	}
>  
>  	/* map file permissions to the closest allowable permissions
> in HFS */

Looks good.

Reviewed-by: Viacheslav Dubeyko <slava@dubeyko.com>

Thanks,
Slava.