linux-kernel - Re: [PATCH v2 06/25] capability: provide helpers for converting between xattrs and vfs

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Message-ID: <ZddqXN51+8UaKVTC@do-x1extreme>
Date: Thu, 22 Feb 2024 09:38:04 -0600
From: "Seth Forshee (DigitalOcean)" <sforshee@...nel.org>
To: Christian Brauner <brauner@...nel.org>
Cc: Serge Hallyn <serge@...lyn.com>, Paul Moore <paul@...l-moore.com>,
	Eric Paris <eparis@...hat.com>, James Morris <jmorris@...ei.org>,
	Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
	Stephen Smalley <stephen.smalley.work@...il.com>,
	Ondrej Mosnacek <omosnace@...hat.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Mimi Zohar <zohar@...ux.ibm.com>,
	Roberto Sassu <roberto.sassu@...wei.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
	Eric Snowberg <eric.snowberg@...cle.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Miklos Szeredi <miklos@...redi.hu>,
	Amir Goldstein <amir73il@...il.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, audit@...r.kernel.org,
	selinux@...r.kernel.org, linux-integrity@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-unionfs@...r.kernel.org
Subject: Re: [PATCH v2 06/25] capability: provide helpers for converting
 between xattrs and vfs_caps

On Thu, Feb 22, 2024 at 04:20:08PM +0100, Christian Brauner wrote:
> > +	if ((magic_etc & VFS_CAP_REVISION_MASK) != VFS_CAP_REVISION_1) {
> > +		vfs_caps->permitted.val += (u64)le32_to_cpu(caps->data[1].permitted) << 32;
> > +		vfs_caps->inheritable.val += (u64)le32_to_cpu(caps->data[1].inheritable) << 32;
> 
> That + makes this even more difficult to read. This should be rewritten.

Do you meant that you would prefer |= to +=, or do you have something
else in mind?

Note though that this is code that I didn't change, just moved.
Generally I tried to avoid changing code if it wasn't necessary for the
aims of this series.

> > +ssize_t vfs_caps_to_xattr(struct mnt_idmap *idmap,
> > +			  struct user_namespace *dest_userns,
> > +			  const struct vfs_caps *vfs_caps,
> > +			  void *data, size_t size)
> > +{
> > +	struct vfs_ns_cap_data *caps = data;
> > +	int ret;
> 
> This should very likely be ssize_t ret.

Indeed, I'll fix that.