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 4B46719F485 for ; Fri, 1 Nov 2024 13:30:45 +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=1730467846; cv=none; b=Bjr6QN68DSoQZL+GUxt14wWcdqnT34fY3z92IILSyTt5c5Pi0XdvoiTPPQAHyNCp0lrzTrjvvmiN+NW3PxfbyUcVNMGhV5ryMa5nRLv0hX/zF5Wu4+vxhjc3rIHLFKYim5Sm1bRCDxVQWSV/4gRyCYzY+mEzb6B39oBs1ef8hzQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730467846; c=relaxed/simple; bh=ylNwOjmU/3lHrXfC/NuedXXqaaUAYBY9gTXmpGVTHpg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=IyEIDNfX6sTwkzSQOdFZUBSotIOa4oyrB45hVuBxLQlCTDN6keMn4Yz/O22GsqH9fkVftkp0ePcRPD5ffH6WdU6ZEhVb84T92Uint7vM51uVX5RFiCc6VW+6ZAbPNUBBQO/rTjuN4QaOmjtZ4x9YVBnET0rVK9zI2lp3KPvgJc0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NK4Cllbf; 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="NK4Cllbf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B35AC4CECD; Fri, 1 Nov 2024 13:30:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730467845; bh=ylNwOjmU/3lHrXfC/NuedXXqaaUAYBY9gTXmpGVTHpg=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=NK4CllbfQkqQW7cAOp0MqTT95AcA9m+FTx4roRJBI8Oqiv4F8H7QK3D14UYdqmspJ f1Y3lAjKCX7yy0BsbSEMunLmTASu9UMkhPlPcme6FI5BXzruzujdRnTOZDYDWWVFWz zY7V1F3UsdbX+spXt/1QkQpanSNSzg6BxF/28pbHGQWSDSUf8eDxEVbW5c3IrnuD7L ef8o/XR/yeiyMR9BR0q5l6ScbQMHuaRrHE18T+pEplfMHIJq2KyGrDi1IccmY7UtYC 02KvKLK6C1BFx23JhJFwh05jXDRSiKDdz7CU65f6/kkVQHb11bUvZb2wGB8/dZFVzG pw4fT0+oJ8Cwg== Message-ID: Subject: Re: [PATCH v3 8/8] NFSD: Send CB_OFFLOAD on graceful shutdown From: Jeff Layton To: Chuck Lever Cc: cel@kernel.org, Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey , linux-nfs@vger.kernel.org Date: Fri, 01 Nov 2024 09:30:44 -0400 In-Reply-To: References: <20241031134000.53396-10-cel@kernel.org> <20241031134000.53396-18-cel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV 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cel@kernel.org wrote: > > > From: Chuck Lever > > >=20 > > > If an async COPY operation happens to be running when the server is > > > shut down, notify the requesting client that the copy has completed. > > >=20 > > > Since the nfs4_client is going away, seems like this could introduce > > > some UAFs. > > >=20 > > > Signed-off-by: Chuck Lever > > > --- > > > fs/nfsd/nfs4proc.c | 6 +++++- > > > 1 file changed, 5 insertions(+), 1 deletion(-) > > >=20 > > > diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c > > > index 4c964bce6bd7..51b3f85f3791 100644 > > > --- a/fs/nfsd/nfs4proc.c > > > +++ b/fs/nfsd/nfs4proc.c > > > @@ -68,6 +68,8 @@ MODULE_PARM_DESC(nfsd4_ssc_umount_timeout, > > > =20 > > > #define NFSDDBG_FACILITY NFSDDBG_PROC > > > =20 > > > +static void nfsd4_send_cb_offload(struct nfsd4_copy *copy); > > > + > > > static u32 nfsd_attrmask[] =3D { > > > NFSD_WRITEABLE_ATTRS_WORD0, > > > NFSD_WRITEABLE_ATTRS_WORD1, > > > @@ -1381,8 +1383,10 @@ void nfsd4_shutdown_copy(struct nfs4_client *c= lp) > > > { > > > struct nfsd4_copy *copy; > > > =20 > > > - while ((copy =3D nfsd4_get_copy(clp)) !=3D NULL) > > > + while ((copy =3D nfsd4_get_copy(clp)) !=3D NULL) { > > > nfsd4_stop_copy(copy); > > > + nfsd4_send_cb_offload(copy); > > > + } > >=20 > > Not sure about a UAF, but it seems like NFS4ERR_DELAY returns might > > delay the client destruction for quite a while. >=20 > The nfsd4_copy() is removed from the nfs4_client's async_copies > list, and the RPC proceeds in the background. It doesn't block the > destruction of the CLIENTID. >=20 > But it might be a problem for the RPC logic to transmit the call > when there's no nfs4_client to dereference. I should probably > drop this patch and try a different approach. No, I think this will block the client shutdown. After nfsd4_shutdown_copy(), it calls nfsd4_shutdown_callback(), which does: flush_workqueue(clp->cl_callback_wq); =20 nfsd41_cb_inflight_wait_complete(clp); =20 So the CB_OFFLOAD workqueue jobs will run, and everything will wait for clp->cl_cb_inflight to go to 0. That won't happen until the CB_OFFLOAD jobs complete. No objection from me though if you see a better approach. Dropping this one for now seems reasonable. >=20 > > Maybe this CB_OFFLOAD shouldn't retry on DELAY? > >=20 > >=20 > > > } > > > #ifdef CONFIG_NFSD_V4_2_INTER_SSC > > > =20 > >=20 > >=20 > > --=20 > > Jeff Layton > >=20 >=20 --=20 Jeff Layton