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 1B3634499A4; Thu, 24 Sep 2026 13:02:32 +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=1790254954; cv=none; b=mpEA+mjQK7fPG6aD1pTvxGHY3FQ4r82TiKmt5Nt7nilymaRRGgP0cTLPJr2+vhnqb0JKTiHbCXQJc1FH3kpmbo06XLpFzcTxSCWw9cPtIOEIqBtEQr0OaOm067mn09omfOMCMsI7gndx8wG2gL7muGtbCgCFCiPOCgZP0BiPCWY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790254954; c=relaxed/simple; bh=F+X9l+8Qw3jOUqvswVvQpRqQwdvk1KRhp5i/siJ6aSE=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=tCtZaKfw24vL3r4EYfxUjelFdeHEm+Pr3HI+nBOEi9gDS7uYFgmYZMvLpYEmndEmgN1zbF7PLZtRNG/eLD1OnQFt7PKir7sin4wZmKLrbC2/mV0osK2e+EJXeamnFk6V+QEXvn1XNIDrImYQjqpf/nsLIe/Yuk6k4VouTwk1low= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PZeAjwFf; 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="PZeAjwFf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 579A31F00893; Thu, 24 Sep 2026 13:02:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790254952; bh=OoJv4hE7nRkyLdCwXnqULA5lTrUqCCcffOfZDfsTCx8=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=PZeAjwFflgp1cE6rzyOISC6ZDTAWKt2dOiYOpJNVKhHyZfdJCC9CsoxJmrdQjh34E EcUr8DQrBjbEu1NVg525RbgHLCYL27pov54inwmSuCRSH52avzZxS2rfjd3jXS6a40 hsvR+mwsR7ehxfZSRiaf9MMSWFWbjpRVRKyCo3hJ9IV5fwcv1dzb0Qf0cqPLR0eyrs xvZtAijd5KqBOfSSR2rvxRm4VZXMrdFg7zxnCFTwEf4DRSVLI0r5LlKF/EHCm3XMgB IqavYt+/may4euMGEfp9GCRvO8NBCM2zvqqFycuGwfO0s8tBoy0MX+ZFHhU2FOrgON iwm2wXZI5T6jw== Message-ID: Subject: Re: [PATCH v2 04/14] ceph: simplify atomic_open to use finish_no_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 09:02:29 -0400 In-Reply-To: <20260919022441.3305170-5-neilb@ownmail.net> References: <20260919022441.3305170-1-neilb@ownmail.net> <20260919022441.3305170-5-neilb@ownmail.net> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw 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Evolution 3.60.2 (3.60.2-2.fc44) Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Another LLM review: > diff --git a/fs/ceph/file.c b/fs/ceph/file.c > index bd3e3f5c269e..83ceb2906f85 100644 > --- a/fs/ceph/file.c > +++ b/fs/ceph/file.c [ ... ] > @@ -977,33 +976,25 @@ int ceph_atomic_open(struct inode *dir, struct dent= ry *dentry, > } > if (err) > goto out_req; > - if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) { > - /* make vfs retry on splice, ENOENT, or symlink */ > - doutc(cl, "finish_no_open on dn %p\n", dn); > - err =3D finish_no_open(file, dn); > - } else { > - if (IS_ENCRYPTED(dir) && > - !fscrypt_has_permitted_context(dir, d_inode(dentry))) { > - pr_warn_client(cl, > - "Inconsistent encryption context (parent %llx:%llx child %llx:%llx)= \n", > - ceph_vinop(dir), ceph_vinop(d_inode(dentry))); > - goto out_req; > - } > + if (IS_ENCRYPTED(dir) && > + !fscrypt_has_permitted_context(dir, d_inode(dentry))) { > + pr_warn_client(cl, > + "Inconsistent encryption context (parent %llx:%llx child %llx:= %llx)\n", > + ceph_vinop(dir), ceph_vinop(d_inode(dentry))); > + goto out_req; > + } The fscrypt check used to run only when the dentry was positive, not a symlink, and had no alias. Now it runs unconditionally, but d_inode() can still be NULL here: a lookup that found nothing leaves a negative dentry with err =3D=3D 0, and when the MDS reply splices an alias the original dentry is never instantiated. fscrypt_has_permitted_context() dereferences its child argument without checking for NULL: fs/crypto/policy.c:fscrypt_has_permitted_context() { ... if (!S_ISREG(child->i_mode) && !S_ISDIR(child->i_mode) && !S_ISLNK(child->i_mode)) return 1; ... } Every other in-tree caller passes a known inode, while this one can pass NULL. An open of a name that does not exist in an encrypted directory reaches this through lookup_open() -> atomic_open() -> ceph_atomic_open(). Could the fscrypt check stay behind the positive-dentry test, as before? --=20 Jeff Layton