From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 059781EEE6; Mon, 26 Aug 2024 14:37:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724683074; cv=none; b=m9yDXjKW6m3KajyRzd+dQJesiPkpSUsH3qKM+ecdN4WRk3jJ6/WsevYFU3Diu2nqhk6//al6T/I8iSJ4hVVDfBINOZvMVd6okWG6b9U8YBc6/Y9pfN+4EPnBg2a6dmCVh/3GZwvXj5a5kB1cZDz2VHxAerLWCDCnDmgOFqg2W4g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724683074; c=relaxed/simple; bh=agS3Cq/Hj9/dQPaLvbe3een3Xt4YCFIRAFvlRPR7LCU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ACFcIt3PgjF/ZMXQ7/HnrImNe+JK0NNWUqL5eshYMZceIPIhaLNK+kEjejV3ASAwhBmC/JUmPmjkcuMAr3HzcTQFRm3lL/29/ZY0AHyfIxAPJkJUmB1p3QVrq9ZqDASXGqmYg9ZpfwQBPBOt6SZe+cko9dswPDH5/Y2uA+0o5MA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=R/R+UjzC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="R/R+UjzC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B477DC4FEBD; Mon, 26 Aug 2024 14:37:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724683073; bh=agS3Cq/Hj9/dQPaLvbe3een3Xt4YCFIRAFvlRPR7LCU=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=R/R+UjzCBN5j/CPiIsnxzjN1CH1zRJ4GBfC3NtSJOun4H+gfO3Lh2pRou3AvcXt1A 88MZd++2tg1x7EAC2cni6ksFUmZGhWfg9S4xL9L1LIrjFuFpuMissiOajG6hNmfdHp Lt/so2T++vZCjZGoyDDc2cvlkmPNovr0H2pgBSOPsVtUzW1d2mf1oZe2rf170HTG0H Obz0w1oPhIMHiRRAN+YXEnATrfiY7m8AE1sah3mwGERqicJzpRaqWhh4/RQphinuxU UyyPwcGzppy4pVtBjSsdYXPD02Bc1dQrZxSK2H5QudZNIme9JF32IHyLjT7Cppwl+l MB44M/BYaoGDQ== Message-ID: <227e2d809951caa485e8ea03978afea515e89464.camel@kernel.org> Subject: Re: [PATCH 0/2] nfsd: CB_GETATTR fixes From: Jeff Layton To: NeilBrown , Chuck Lever Cc: Olga Kornievskaia , Dai Ngo , Tom Talpey , "linux-nfs@vger.kernel.org" , "linux-kernel@vger.kernel.org" Date: Mon, 26 Aug 2024 10:37:51 -0400 In-Reply-To: <172462816214.6062.16988455872478253419@noble.neil.brown.name> References: <20240823-nfsd-fixes-v1-0-fc99aa16f6a0@kernel.org> , <172462816214.6062.16988455872478253419@noble.neil.brown.name> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Mon, 2024-08-26 at 09:22 +1000, NeilBrown wrote: > On Sun, 25 Aug 2024, Chuck Lever wrote: > > On Fri, Aug 23, 2024 at 06:27:37PM -0400, Jeff Layton wrote: > > > Fixes for a couple of CB_GETATTR bugs I found while working on the > > > delstid set. Mostly this just ensures that we hold references to the > > > delegation while working with it. > > >=20 > > >=20 > >=20 > > Applied to nfsd-fixes for v6.11-rc, thanks! > >=20 > > [1/2] nfsd: hold reference to delegation when updating it for cb_getatt= r > > commit: 8fceb5f6636bbbf803fe29fff59f138206559964 > > [2/2] nfsd: fix potential UAF in nfsd4_cb_getattr_release > > commit: 8bc97f9b84c8852fcc56be2382f5115c518de785 > >=20 > > --=20 > > Chuck Lever > >=20 >=20 > Maybe the following can tidy up that code. I can split this into > a few separate patches if you like. > Thoughts? >=20 > Note that the patch is easier to review if you apply it then use "git > diff -b". >=20 > NeilBrown >=20 >=20 > From: NeilBrown > Subject: [PATCH] nfsd: untangle code in nfsd4_deleg_getattr_conflict() >=20 > The code in nfsd4_deleg_getattr_conflict() is convoluted and buggy. >=20 > With this patch we: > - properly handle non-nfsd leases. We must not assume flc_owner is a > delegation unless fl_lmops =3D=3D &nfsd_lease_mng_ops AFAICT, non-nfsd leases are already properly handled (though I do agree that the "flow" of this code is awkward). What case do you see that's wrong? > - move the main code out of the for loop > - have a single exit which calls nfs4_put_stid() > (and other exits which don't need to call that) >=20 > Fixes: c5967721e106 ("NFSD: handle GETATTR conflict with write delegation= ") > Signed-off-by: NeilBrown > --- > fs/nfsd/nfs4state.c | 130 ++++++++++++++++++++++---------------------- > 1 file changed, 65 insertions(+), 65 deletions(-) >=20 > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c > index 2c4b9a22b2bb..7672fa7a70f3 100644 > --- a/fs/nfsd/nfs4state.c > +++ b/fs/nfsd/nfs4state.c > @@ -8837,6 +8837,7 @@ nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp= , struct dentry *dentry, > struct nfsd_net *nn =3D net_generic(SVC_NET(rqstp), nfsd_net_id); > struct inode *inode =3D d_inode(dentry); > struct file_lock_context *ctx; > + struct nfs4_delegation *dp =3D NULL; > struct nfs4_cb_fattr *ncf; > struct file_lease *fl; > struct iattr attrs; > @@ -8845,77 +8846,76 @@ nfsd4_deleg_getattr_conflict(struct svc_rqst *rqs= tp, struct dentry *dentry, > ctx =3D locks_inode_context(inode); > if (!ctx) > return 0; > + > +#define NON_NFSD_LEASE ((void*)1) > + > spin_lock(&ctx->flc_lock); > for_each_file_lock(fl, &ctx->flc_lease) { > - unsigned char type =3D fl->c.flc_type; > - > if (fl->c.flc_flags =3D=3D FL_LAYOUT) > continue; > - if (fl->fl_lmops !=3D &nfsd_lease_mng_ops) { > - /* > - * non-nfs lease, if it's a lease with F_RDLCK then > - * we are done; there isn't any write delegation > - * on this inode > - */ > - if (type =3D=3D F_RDLCK) > - break; > - goto break_lease; > - } > - if (type =3D=3D F_WRLCK) { > - struct nfs4_delegation *dp =3D fl->c.flc_owner; > - > - if (dp->dl_recall.cb_clp =3D=3D *(rqstp->rq_lease_breaker)) { > - spin_unlock(&ctx->flc_lock); > - return 0; > - } > -break_lease: > - nfsd_stats_wdeleg_getattr_inc(nn); > - dp =3D fl->c.flc_owner; > - refcount_inc(&dp->dl_stid.sc_count); > - ncf =3D &dp->dl_cb_fattr; > - nfs4_cb_getattr(&dp->dl_cb_fattr); > - spin_unlock(&ctx->flc_lock); > - wait_on_bit_timeout(&ncf->ncf_cb_flags, CB_GETATTR_BUSY, > - TASK_INTERRUPTIBLE, NFSD_CB_GETATTR_TIMEOUT); > - if (ncf->ncf_cb_status) { > - /* Recall delegation only if client didn't respond */ > - status =3D nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ)); > - if (status !=3D nfserr_jukebox || > - !nfsd_wait_for_delegreturn(rqstp, inode)) { > - nfs4_put_stid(&dp->dl_stid); > - return status; > - } > - } > - if (!ncf->ncf_file_modified && > - (ncf->ncf_initial_cinfo !=3D ncf->ncf_cb_change || > - ncf->ncf_cur_fsize !=3D ncf->ncf_cb_fsize)) > - ncf->ncf_file_modified =3D true; > - if (ncf->ncf_file_modified) { > - int err; > - > - /* > - * Per section 10.4.3 of RFC 8881, the server would > - * not update the file's metadata with the client's > - * modified size > - */ > - attrs.ia_mtime =3D attrs.ia_ctime =3D current_time(inode); > - attrs.ia_valid =3D ATTR_MTIME | ATTR_CTIME | ATTR_DELEG; > - inode_lock(inode); > - err =3D notify_change(&nop_mnt_idmap, dentry, &attrs, NULL); > - inode_unlock(inode); > - if (err) { > - nfs4_put_stid(&dp->dl_stid); > - return nfserrno(err); > - } > - ncf->ncf_cur_fsize =3D ncf->ncf_cb_fsize; > - *size =3D ncf->ncf_cur_fsize; > - *modified =3D true; > - } > - nfs4_put_stid(&dp->dl_stid); > - return 0; > + if (fl->c.flc_type =3D=3D F_WRLCK) { > + if (fl->fl_lmops =3D=3D &nfsd_lease_mng_ops) > + dp =3D fl->c.flc_owner; > + else > + dp =3D NON_NFSD_LEASE; > } > break; > } > + if (dp =3D=3D NULL || dp =3D=3D NON_NFSD_LEASE || > + dp->dl_recall.cb_clp =3D=3D *(rqstp->rq_lease_breaker)) { > + spin_unlock(&ctx->flc_lock); > + if (dp =3D=3D NON_NFSD_LEASE) { > + status =3D nfserrno(nfsd_open_break_lease(inode, > + NFSD_MAY_READ)); > + if (status !=3D nfserr_jukebox || > + !nfsd_wait_for_delegreturn(rqstp, inode)) > + return status; > + } > + return 0; > + } > + > + nfsd_stats_wdeleg_getattr_inc(nn); > + refcount_inc(&dp->dl_stid.sc_count); > + ncf =3D &dp->dl_cb_fattr; > + nfs4_cb_getattr(&dp->dl_cb_fattr); > spin_unlock(&ctx->flc_lock); > - return 0; > + > + wait_on_bit_timeout(&ncf->ncf_cb_flags, CB_GETATTR_BUSY, > + TASK_INTERRUPTIBLE, NFSD_CB_GETATTR_TIMEOUT); > + if (ncf->ncf_cb_status) { > + /* Recall delegation only if client didn't respond */ > + status =3D nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ)); > + if (status !=3D nfserr_jukebox || > + !nfsd_wait_for_delegreturn(rqstp, inode)) > + goto out_status; > + } > + if (!ncf->ncf_file_modified && > + (ncf->ncf_initial_cinfo !=3D ncf->ncf_cb_change || > + ncf->ncf_cur_fsize !=3D ncf->ncf_cb_fsize)) > + ncf->ncf_file_modified =3D true; > + if (ncf->ncf_file_modified) { > + int err; > + > + /* > + * Per section 10.4.3 of RFC 8881, the server would > + * not update the file's metadata with the client's > + * modified size > + */ > + attrs.ia_mtime =3D attrs.ia_ctime =3D current_time(inode); > + attrs.ia_valid =3D ATTR_MTIME | ATTR_CTIME | ATTR_DELEG; > + inode_lock(inode); > + err =3D notify_change(&nop_mnt_idmap, dentry, &attrs, NULL); > + inode_unlock(inode); > + if (err) { > + status =3D nfserrno(err); > + goto out_status; > + } > + ncf->ncf_cur_fsize =3D ncf->ncf_cb_fsize; > + *size =3D ncf->ncf_cur_fsize; > + *modified =3D true; > + } > + status =3D 0; > +out_status: > + nfs4_put_stid(&dp->dl_stid); > + return status; > } Patch looks like a nice cleanup, but I don't think the Fixes tag is appropriate here. --=20 Jeff Layton