From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 751F147D92F; Thu, 24 Sep 2026 13:13:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790255635; cv=none; b=kcQQcufLpZcNRoMbQuFr2TkhJP4p0JuRUQThN1BadQ90GCFZUdxNjPj+OxW5iLrC9D8tNKG/0AapPgpo45ZtLTEuV5Enz17WT/tGL1DmgiOVkTMm4wta1GRTNlK4svMBTP89wEq6nJcmLPpNW8S7eAuspIcyagC7+7oYqDkggT8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790255635; c=relaxed/simple; bh=SDRx3+VcdGaaNt8/JqYuEAywmrmMs0tJzocl9lQyMlg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=u4hRrFz1LsvUJnZuDjUUaJ8RdypcNEGroXwmUd8YI9Y0X9EaAFtXv4J84irvc/blUdrNVJ1hf3/xZoyfOGvgiqN6qSNbliqLM8sLx4kXcVLJ3VFafzBlNrYcWgXmYqlJxWe269q4aHu0Flm0gbfeawPTRcu7+BSdLRrXDt67hJk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nK3DqKYC; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nK3DqKYC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A22DC1F000FF; Thu, 24 Sep 2026 13:13:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790255634; bh=1FPuxwA7U/Oka2FvjX4JcthGqDjhawyI31UGFPK+B8A=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=nK3DqKYCh/zCXC4zGxqWUtES3r/fTjJm9w/ODW7RxJEzhk3SdLek8jvV851dQBZJO njpeITCa0GDdPkRoGUegV+b4WXq4Q3r2Mv+w9DK2KNJli3gD8oy2xYSpLm5smQ6ipk vpwq89vgyx5za29EiDaryndHi53+Qhub2xe8tEebYwvf1gAg/2ZwUxa+QYXv2KEaLe l15GyXoYlb7of4jhaeuttZlx0h0n/nojBIlP4vOS7RlL/mSa8Doc8NXb+2uxebNkTr ReUyGBwwFUT+EFIZ4NqUIT198KMEEZuQS9FZSo921z8DL/iwRAdyBcNsHhMGPeckvJ JfYMbARm6cYhw== Message-ID: <06b05140db43b94e8a8cbf877f73e74d3fbb306e.camel@kernel.org> Subject: Re: [PATCH v2 09/14] vfs: change vfs_lookup_open() to use do_open(), not vfs_open() From: Jeff Layton To: NeilBrown , Alexander Viro , Christian Brauner , Chuck Lever , Jori Koolstra , Mateusz Guzik , Dorjoy Chowdhury Cc: Trond Myklebust , Anna Schumaker , Andreas Gruenbacher , gfs2@lists.linux.dev, Ilya Dryomov , Alex Markuze , Viacheslav Dubeyko , ceph-devel@vger.kernel.org, Paulo Alcantara , Namjae Jeon , linux-cifs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org Date: Thu, 24 Sep 2026 09:13:51 -0400 In-Reply-To: <20260919022441.3305170-10-neilb@ownmail.net> References: <20260919022441.3305170-1-neilb@ownmail.net> <20260919022441.3305170-10-neilb@ownmail.net> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.2 (3.60.2-2.fc44) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sat, 2026-09-19 at 12:06 +1000, NeilBrown wrote: > From: NeilBrown >=20 > The vfs_open() call misses permission checks which should happen before > an open is attempted (atomic_open does separate permission checks). >=20 > Much of the code in do_open() will have no effect as relevant LOOKUP_ > flags aren't set. truncation will be done (which nfsd is not expected > to use) along with some audit logs and security hook. The important > benefit is getting the may_open() check. >=20 > Signed-off-by: NeilBrown > --- > fs/namei.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/namei.c b/fs/namei.c > index ba3e7e4b5fdb..8ef2d44b6108 100644 > --- a/fs/namei.c > +++ b/fs/namei.c > @@ -4604,6 +4604,9 @@ out_dput: > goto out; > } > =20 > +static int do_open(struct nameidata *nd, > + struct file *file, const struct open_flags *op); > + > /** > * vfs_lookup_open - open and possibly create a regular file > * @parent: directory to contain file > @@ -4660,6 +4663,9 @@ struct file *vfs_lookup_open(struct path *parent, s= truct qstr *last, > } > op.open_flag =3D open_flag; > op.mode =3D mode; > + op.acc_mode =3D ACC_MODE(open_flag); > + if (open_flag & O_TRUNC) > + op.acc_mode |=3D MAY_WRITE; > dentry =3D lookup_open(&nd, file, &op); > =20 > if (IS_ERR(dentry)) > @@ -4677,7 +4683,7 @@ struct file *vfs_lookup_open(struct path *parent, s= truct qstr *last, > error =3D -ELOOP; > } else if (!(file->f_mode & FMODE_OPENED)) { > nd.path.dentry =3D dentry; > - error =3D vfs_open(&nd.path, file); > + error =3D do_open(&nd, file, &op); > } > dput(dentry); > =20 I think the code looks right, but the vfs_open -> do_open change is largely unmentioned in the changelog. It'd be good to flesh that out some. Reviewed-by: Jeff Layton