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 3D2BD4ED1B4; Tue, 13 Oct 2026 11:03:46 +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=1791889429; cv=none; b=eVdmTDpYlIq/V23IP2bqyInfayGAK1VFagT+Usz/QsG5gOh1hGO8heXxJKTNr2ebfa4MhJC9QJYJ9wmFaCYgD2ktCd28g+ZQNRpJZRta4fJ+a9xhsyIk/lRg6enPBNylkqTrv1b5Fmqv9LWPdvoRvKcJJf0sY0olkVGfZB5u72w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791889429; c=relaxed/simple; bh=IcUpQx0cfcB4WZ9TjO1JA0D5c8EoXbDr5mb/HcHZSnM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=pemSlm+ys3Qr/5PJOvV1yow0aO8GU1Z9T8OAKuSi3YH9xiTfPKjZcna1898SrwqZvXcmClurORc4xxrI+Ie6gjrtl/7mUKpxCLk14ZmgK/hoP0owLq7E15Bouocrm4cB/QwTNPDD3OqzI0Q+25BUIBwF/GHNUQyM/5WloVUpjL4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FSJl9bP4; 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="FSJl9bP4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0B3991F000FF; Tue, 13 Oct 2026 11:03:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791889425; bh=BOfuxyaoyfJYpHpkro6gMv4TI/nBVVskOfYfcXUMaoI=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=FSJl9bP4Ug4HxP6HQ7f7RSAFuqtl9YQnkMSRwnrAnfBryghdz3ZI9+kX3VYzHl+wd FKzYl//lPzpSjLSTQO/1EToIhySylTfIMo69FCBg+P4MMpEaACUtw10dtp5ave9iJC 0trZLxOBs8BaoxM0595F8zTqLlSJ0bj410Iod7chyyIDSR+9vxjkc1/m0B4tWYq6as 897Hv0NZXsiEIi4gvQwcEOgCKVCQo8nbxSwnGl0xw+KF2YMUQPavRECpHsPIpCXOuT gfvGTiNMn2rQJI5FYfqGJOYo8+gtKoPjcP7XVTu49TuStx8IjOAtDs+wrUEcnG1amR 0Lxt5IggyE3Iw== Message-ID: <3a6b84453aaa75b654155a699d4f85735df9c48d.camel@kernel.org> Subject: Re: [PATCH v2] 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, stable@vger.kernel.org Date: Tue, 13 Oct 2026 07:03:43 -0400 In-Reply-To: <20261013060021.46543-1-bint4b13@gmail.com> References: <133aa8197620ef4f36a48faa62c207f5ee12c0a0.camel@kernel.org> <20261013060021.46543-1-bint4b13@gmail.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv 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linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-10-13 at 15:00 +0900, Jinpyo Lee wrote: > nfsd4_free_stateid() finds an admin-revoked layout stateid with > find_stateid_locked(), which does not acquire a reference. The layout > case drops cl_lock without marking the stateid closed, then stops fence > work and calls nfs4_put_stid() without owning a reference. Concurrent > disposal can therefore access a freed layout stateid or drop a reference > owned by another holder. >=20 > Mark the layout stateid CLOSED under cl_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. This keeps the stateid > alive even though its IDR owns no reference and its layout segments are > being removed. >=20 > Use cl_lock for the CLOSED update in LAYOUTRETURN as well, matching the > common stateid locking rule. Retain ls_mutex from the last segment remova= l > through the CLOSED update, and recheck CLOSED under cl_lock after taking > ls_mutex in LAYOUTGET. This prevents a stale LAYOUTGET from adding a > segment after the drain. Also make the newly allocated layout stateid the > error-path put target and update the status-locking comment. >=20 > Restrict nfs40_clean_admin_revoked() to NFSv4.0 clients. Its timer is > armed only by v4.0 revocations, while session clients dispose of revoked > stateids through FREE_STATEID. Skipping session clients prevents the scan > from repeatedly selecting a CLOSED stateid that remains in the IDR while > an in-flight operation holds a reference. >=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= ()") > Suggested-by: Chuck Lever > Cc: stable@vger.kernel.org > Assisted-by: LLM > Signed-off-by: Jinpyo Lee > --- > Changes since v1: > - Address Jeff Layton's concern by using cl_lock for layout CLOSED > checks and updates, without a type-dependent stateid status helper. > - Move LAYOUTRETURN's CLOSED update outside ls_lock while retaining > ls_mutex, and update the status-locking documentation. > - Clarify the LAYOUTGET serialization and v4.0 cleanup restriction. > - Credit Chuck Lever's suggestion and mark the fix for stable review. > - Rebase onto nfsd-testing c807415bc69013a5f162264ee0e14f8742c182f7. >=20 > Validated on the above nfsd-testing base (2026-10-13): > - Applied cleanly, passed strict checkpatch, and built and booted an x86_= 64 > kernel with GCC 13.3, W=3D1, Generic KASAN, lockdep, and pNFS block and > SCSI layouts enabled. > - Loopback pNFS SCSI read, shrink, integrity, revocation, and cleanup tes= ts > passed, as did NFSv4.2, NFSv4.0, and NFSv3 read/write, fio CRC32C, and > unmount tests. Tracing observed two successful LAYOUTRETURNs reach the > modified CLOSED update and release their stateids. > - Two concurrent FREE_STATEID requests from different slots of one NFSv4.= 1 > session returned one success and one NFS4ERR_BAD_STATEID. A test-only > two-second pause forced the losing request into the disposal window; > tracing observed CLOSED, exactly one revoked-layout drain, and one > layout-state free. > - No KASAN, lockdep, refcount, list-corruption, WARNING, or Oops report > occurred, and kernel taint remained zero through fixture cleanup. >=20 > Build note: Existing format-truncation warnings in target_core_transport.= c > were excluded from WERROR; W=3D1 and WERROR remained enabled otherwise. >=20 > The full xfstests suite was not run. Earlier v1 runtime results are not > used as validation of this revision. >=20 > fs/nfsd/nfs4layouts.c | 34 ++++++++++++++++++++++++++++++++-- > fs/nfsd/nfs4state.c | 14 ++++++++++++++ > fs/nfsd/pnfs.h | 6 ++++++ > fs/nfsd/state.h | 5 ++--- > 4 files changed, 54 insertions(+), 5 deletions(-) >=20 > diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c > index 898776c9d..749ace97e 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(&stid->sc_client->cl_lock); > + if (stid->sc_status & SC_STATUS_CLOSED) { > + spin_unlock(&stid->sc_client->cl_lock); > + status =3D nfserr_bad_stateid; > + goto out_unlock_stid; > + } > + spin_unlock(&stid->sc_client->cl_lock); > + > *lsp =3D ls; > return 0; > =20 > @@ -537,12 +547,18 @@ nfsd4_return_file_layouts(struct svc_rqst *rqstp, > nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid); > lrp->lrs_present =3D true; > } else { > - trace_nfsd_layoutstate_unhash(&ls->ls_stid.sc_stateid); > - ls->ls_stid.sc_status |=3D SC_STATUS_CLOSED; > lrp->lrs_present =3D false; > } > spin_unlock(&ls->ls_lock); > =20 > + if (!lrp->lrs_present) { > + /* ls_mutex prevents a LAYOUTGET from adding another segment. */ > + spin_lock(&ls->ls_stid.sc_client->cl_lock); > + ls->ls_stid.sc_status |=3D SC_STATUS_CLOSED; > + spin_unlock(&ls->ls_stid.sc_client->cl_lock); > + trace_nfsd_layoutstate_unhash(&ls->ls_stid.sc_stateid); > + } > + > mutex_unlock(&ls->ls_mutex); > nfs4_put_stid(&ls->ls_stid); > nfsd4_free_layouts(&reaplist); > @@ -594,6 +610,20 @@ 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 26d2d56a5..1740b86eb 100644 > --- a/fs/nfsd/nfs4state.c > +++ b/fs/nfsd/nfs4state.c > @@ -5873,9 +5873,21 @@ static void nfsd4_drop_revoked_stid(struct nfs4_st= id *s) > break; > case SC_TYPE_LAYOUT: > ls =3D layoutstateid(s); > + if (s->sc_status & SC_STATUS_CLOSED) { > + spin_unlock(&cl->cl_lock); > + break; > + } > + s->sc_status |=3D SC_STATUS_CLOSED; > + /* > + * 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: > @@ -7901,6 +7913,8 @@ 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)) > 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) > { > diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h > index 79dfa47b8..63b581104 100644 > --- a/fs/nfsd/state.h > +++ b/fs/nfsd/state.h > @@ -148,9 +148,8 @@ struct nfs4_stid { > * nn->deleg_lock protects sc_status for hashed delegation stateids. > * ->cl_lock protects the bits set as one is disposed of > * (SC_STATUS_CLOSED, SC_STATUS_FREEABLE, SC_STATUS_FREED) and > - * sc_status for open and lock stateids. ->st_mutex also protects > - * sc_status for open stateids. ->ls_lock protects sc_status for > - * layout stateids. > + * sc_status for open, lock, and layout stateids. ->st_mutex also protec= ts > + * sc_status for open stateids. > */ > /* > * For an open stateid kept around *only* to process close replays. >=20 > base-commit: c807415bc69013a5f162264ee0e14f8742c182f7 Better! I do like the fact that we don't have different rules now. Sashiko flagged a potential issue with v4.0 handling that needs to be addressed, however: https://sashiko.dev/#/patchset/20261013060021.46543-1-bint4b13%40gmail.com --=20 Jeff Layton