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 37A10489FBF; Mon, 12 Oct 2026 12:17:33 +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=1791807455; cv=none; b=LszqFZQzo2sn8+Ukt/6R7P3A/4KAAFMtWxuXjPWZYTD0tTe+OMDvwmLtvCkFngRYepiCVcE4nmg6kvZdOQpiEw4OJhHyVngmUEF3BBOAaa+Ghk3OntvK+J3eq/32EZ/T/HLKAJpMKLOWv9XWs+XI2N09WNgpNH5KE9Fsox8/Uig= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791807455; c=relaxed/simple; bh=y4s5ZjULgSm3O7XJT1aomsoYH/W6LK57tuXyeyfOdNg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=PNvQiBvJhhNVlT5xUVU+FMH2dJN+MdFep9qjnrK/7HDZThEWO2pAqt8IMfvH6qaVDScg5Eam058Vbv4KLtYY7Ohxvg+fJJ2oNcLaC4CSjFM+CH9cXLDhg/j8DomMFG1weA3BRfr7UioYsmePsIA8ktVQn6Nb80RXyM622J5EH9E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l3Q/VwcL; 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="l3Q/VwcL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2410B1F0089B; Mon, 12 Oct 2026 12:17:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791807453; bh=zurEfVG8DOx6Cdmg2rSk/R1bNceHXwlw55NXrjY+LSc=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=l3Q/VwcL5iRVTmiFRr4NdmG+xJ1eEAGYXsYIhBwbHDeFpsnWQBSOaYiHK0JNI4+Fw ejDJTMgK3wLF77JdiuQ1rEw22+FrO1/0xLp8RlZBd+nL+Lsv989WM8rDr9h0UcyhP8 tJuvFG037KZIiU3gHZmSCLXN8phSCeaKhzCwiaj2JnVIKqcGyMS8wqp/GQhbyyat81 Hr+97Mfmk9uWIeDDJ5eZeWS47FMy4m+w2pAuelJlzhwmMizIUTGk9my+2CASinlVHO vqpWWh7Dko5OgFuVvgf+qJasxv5QR1vn2nJKldI7RkSjMEOCGnk2FRbVZWoZ6W4Me4 hjh8Ivl6r4EqQ== Message-ID: <133aa8197620ef4f36a48faa62c207f5ee12c0a0.camel@kernel.org> Subject: Re: [PATCH] nfsd: prevent a double put of revoked layout stateids From: Jeff Layton To: Jinpyo Lee , linux-nfs@vger.kernel.org Cc: Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , linux-kernel@vger.kernel.org, bobtobabz@gmail.com Date: Mon, 12 Oct 2026 08:17:31 -0400 In-Reply-To: <20261012084722.5168-1-bint4b13@gmail.com> References: <20261012084722.5168-1-bint4b13@gmail.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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an admin-revoked layout stateid with > find_stateid_locked(), which does not acquire a reference. Since the > layout case does not mark the stateid closed before dropping cl_lock, > two FREE_STATEID operations in separate session slots can both select > the same stateid and drop a reference they do not own. >=20 > With fence-work teardown in place, the second caller can also wait in > nfsd4_stop_layout_fence() until the first caller frees the stateid, then > resume through its freed fence mutex and layout lock. >=20 > Mark the layout stateid CLOSED under cl_lock and ls_lock so only one > disposal caller proceeds. Take a temporary reference before dropping > cl_lock and hold it while stopping fence work and draining the remaining > layout segments, then release that reference with the final put. >=20 > The layout stateid IDR does not own a separate reference. The initial > allocation reference is released when LAYOUTGET completes, and each > layout segment holds its own reference. Serialize segment draining with > in-flight layout operations using ls_mutex, and recheck CLOSED after > acquiring that mutex so a stale LAYOUTGET cannot add a segment after the > drain. Also make the newly allocated layout stateid the error-path put > target. >=20 > Read CLOSED under ls_lock in FREE_STATEID, and restrict > nfs40_clean_admin_revoked() to NFSv4.0 clients. Session clients dispose > of revoked stateids through FREE_STATEID and must not be processed by > the NFSv4.0 cleanup while layout disposal is in progress. >=20 > The vulnerability research and validation were conducted by members of > the Tobabz team as part of the Best of the Best 15th program. >=20 > Fixes: 86b9898920a6 ("NFSD: Handle layout stid in nfsd4_drop_revoked_stid= ()") > Assisted-by: LLM > Signed-off-by: Jinpyo Lee > --- > Validated on nfsd-testing d918c664efd5ec6a7309e98f567fb018bcde0e11 > (2026-10-12): > - Applied cleanly and passed strict checkpatch with no errors or warnings= . > - Built and booted an x86_64 kernel and modules with GCC 13.3, W=3D1, > Generic KASAN, lockdep, and pNFS block and SCSI layouts enabled. > - NFSv4.2, NFSv4.0, and NFSv3 read/write, fio, and unmount tests passed. > - On a real loopback pNFS SCSI layout, administrator revocation followed > by one FREE_STATEID removed the layout stateid and reduced the > admin-revoked count from 2 to 1. The sequence passed twice. > - Tracing observed nfsd4_stop_layout_fence() in both revocation and > FREE_STATEID processing, followed by nfsd_layoutstate_free. > - No KASAN, lockdep, refcount, list-corruption, or Oops report occurred; > kernel taint remained zero. >=20 > The full xfstests suite and a forced concurrent two-slot FREE_STATEID > race were not run on this revision. >=20 > fs/nfsd/nfs4layouts.c | 24 ++++++++++++++++++++++++ > fs/nfsd/nfs4state.c | 37 ++++++++++++++++++++++++++++++++++++- > fs/nfsd/pnfs.h | 6 ++++++ > 3 files changed, 66 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c > index 898776c9d..74c39e216 100644 > --- a/fs/nfsd/nfs4layouts.c > +++ b/fs/nfsd/nfs4layouts.c > @@ -312,6 +312,7 @@ nfsd4_preprocess_layout_stateid(struct svc_rqst *rqst= p, > status =3D nfserr_jukebox; > if (!ls) > goto out; > + stid =3D &ls->ls_stid; > mutex_lock(&ls->ls_mutex); > } else { > ls =3D container_of(stid, struct nfs4_layout_stateid, ls_stid); > @@ -324,6 +325,15 @@ nfsd4_preprocess_layout_stateid(struct svc_rqst *rqs= tp, > goto out_unlock_stid; > } > =20 > + /* A new or looked-up stateid may have been closed before ls_mutex. */ > + spin_lock(&ls->ls_lock); > + if (ls->ls_stid.sc_status & SC_STATUS_CLOSED) { > + spin_unlock(&ls->ls_lock); > + status =3D nfserr_bad_stateid; > + goto out_unlock_stid; > + } > + spin_unlock(&ls->ls_lock); > + > *lsp =3D ls; > return 0; > =20 > @@ -594,6 +604,20 @@ nfsd4_return_all_layouts(struct nfs4_layout_stateid = *ls, > spin_unlock(&ls->ls_lock); > } > =20 > +void nfsd4_return_revoked_layout(struct nfs4_layout_stateid *ls) > +{ > + LIST_HEAD(reaplist); > + > + /* > + * The caller holds a stateid reference until segment draining ends. > + * Wait for any LAYOUTGET that passed the CLOSED check. > + */ > + mutex_lock(&ls->ls_mutex); > + nfsd4_return_all_layouts(ls, &reaplist); > + mutex_unlock(&ls->ls_mutex); > + nfsd4_free_layouts(&reaplist); > +} > + > void > nfsd4_return_all_client_layouts(struct nfs4_client *clp) > { > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c > index 920967dd6..02bfbd242 100644 > --- a/fs/nfsd/nfs4state.c > +++ b/fs/nfsd/nfs4state.c > @@ -5837,6 +5837,24 @@ nfsd4_find_existing_open(struct nfs4_file *fp, str= uct nfsd4_open *open) > return ret; > } > =20 > +/* cl_lock is held; layout stateid status also requires ls_lock. */ > +static bool nfsd4_stid_is_closed(struct nfs4_stid *s) > +{ > + struct nfs4_layout_stateid *ls; > + bool closed; > + > + lockdep_assert_held(&s->sc_client->cl_lock); > + > + if (s->sc_type !=3D SC_TYPE_LAYOUT) > + return s->sc_status & SC_STATUS_CLOSED; > + > + ls =3D layoutstateid(s); > + spin_lock(&ls->ls_lock); > + closed =3D s->sc_status & SC_STATUS_CLOSED; > + spin_unlock(&ls->ls_lock); > + return closed; > +} > + ^^^=20 I must say that I'm not thrilled with the different locking rules for SC_STATUS_CLOSED with different types of stateids. That has a strong code smell in my opinion and will be difficult (for humans) to keep straight. I don't have a better suggestion for the moment, but I'd strongly prefer something that didn't add these extra rules around a flag common to all stateids. > static void nfsd4_drop_revoked_stid(struct nfs4_stid *s) > __releases(&s->sc_client->cl_lock) > { > @@ -5871,9 +5889,24 @@ static void nfsd4_drop_revoked_stid(struct nfs4_st= id *s) > break; > case SC_TYPE_LAYOUT: > ls =3D layoutstateid(s); > + spin_lock(&ls->ls_lock); > + if (s->sc_status & SC_STATUS_CLOSED) { > + spin_unlock(&ls->ls_lock); > + spin_unlock(&cl->cl_lock); > + break; > + } > + s->sc_status |=3D SC_STATUS_CLOSED; > + spin_unlock(&ls->ls_lock); > + /* > + * The IDR does not own a layout stateid reference. Keep ls > + * alive while draining worker and segment references below; > + * the final put releases this temporary reference. > + */ > + refcount_inc(&s->sc_count); > list_del_init(&ls->ls_perclnt); > spin_unlock(&cl->cl_lock); > nfsd4_stop_layout_fence(ls); > + nfsd4_return_revoked_layout(ls); > nfs4_put_stid(s); > break; > default: > @@ -7899,6 +7932,8 @@ static void nfs40_clean_admin_revoked(struct nfsd_n= et *nn, > unsigned long id, tmp; > struct nfs4_stid *stid; > =20 > + if (clp->cl_minorversion !=3D 0) > + continue; > if (atomic_read(&clp->cl_admin_revoked) =3D=3D 0) > continue; > if (is_client_expired(clp)) > @@ -8698,7 +8733,7 @@ nfsd4_free_stateid(struct svc_rqst *rqstp, struct n= fsd4_compound_state *cstate, > =20 > spin_lock(&cl->cl_lock); > s =3D find_stateid_locked(cl, stateid); > - if (!s || s->sc_status & SC_STATUS_CLOSED) > + if (!s || nfsd4_stid_is_closed(s)) > goto out_unlock; > if (s->sc_status & SC_STATUS_ADMIN_REVOKED) { > nfsd4_drop_revoked_stid(s); > diff --git a/fs/nfsd/pnfs.h b/fs/nfsd/pnfs.h > index 559df0e5b..9b0f17a4d 100644 > --- a/fs/nfsd/pnfs.h > +++ b/fs/nfsd/pnfs.h > @@ -75,6 +75,7 @@ struct nfsd4_deviceid_map *nfsd4_find_devid_map(int idx= ); > #ifdef CONFIG_NFSD_PNFS > void nfsd4_setup_layout_type(struct svc_export *exp); > void nfsd4_return_all_client_layouts(struct nfs4_client *); > +void nfsd4_return_revoked_layout(struct nfs4_layout_stateid *ls); > void nfsd4_return_all_file_layouts(struct nfs4_client *clp, > struct nfs4_file *fp); > void nfsd4_close_layout(struct nfs4_layout_stateid *ls); > @@ -93,6 +94,11 @@ static inline void nfsd4_setup_layout_type(struct svc_= export *exp) > static inline void nfsd4_return_all_client_layouts(struct nfs4_client *c= lp) > { > } > + > +static inline void nfsd4_return_revoked_layout(struct nfs4_layout_statei= d *ls) > +{ > +} > + > static inline void nfsd4_return_all_file_layouts(struct nfs4_client *clp= , > struct nfs4_file *fp) > { >=20 > base-commit: d918c664efd5ec6a7309e98f567fb018bcde0e11 --=20 Jeff Layton