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 3157986331 for ; Wed, 23 Apr 2025 20:35:45 +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=1745440546; cv=none; b=X7BN7vcLsUX8XWXjw4jNdVpB3hQwu2u57LJxN639oyOzsYU1Dw0MIjEPWP7ZJQYg77xefigD/ukysSBhemNwaG3/oTsUSLLbu8zw8CRJ7ZyieS2S+92pdKpH6K7QsZFYSX+9/ZCSXTLuezGa1PmCLIpp+fUHFLL7JCowt3JAzPg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745440546; c=relaxed/simple; bh=fxsMmmwLj9OtltNymRNlc3bdLF5Rn92z9WMF4LsaP8U=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=iieCBc+skiZ6nSwAlM1bautdd7sjLq6Tv9L/vP40tvSLj2ojKRZozgsoL7sBEiAmq1na9EXY2yn8uTd/LhCGLGqQOIE7LNWLJl7ZbkNRdNHabqVzLOwLyjDxQpEyB1EidDTNR1HhKu0lv6+6fuMIWJHwsguIgWVJ5dsJPpt6i4M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qDqUrEK0; 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="qDqUrEK0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 49F32C4CEE2; Wed, 23 Apr 2025 20:35:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745440545; bh=fxsMmmwLj9OtltNymRNlc3bdLF5Rn92z9WMF4LsaP8U=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=qDqUrEK00DfPuSsxjjapOWGQzjqhYMcmTgx9OTfhOwslnAueWYQtZLe0ZIyqAk5U7 N+6yfyTNI9erRNzd84ijwETBo2YYphr+0dVYGxT12IOOIRyU/2pn6KMgIdCY+OrQwu /cOoGA4+SvONrkrWsLU/HUMvdhvFc4R7ZjfpxB8okk70a4/dndgnDGWTtDAaPYQvAe om8w8YBFOdZP4oreGa0qhU4EnmPDG5kTLNV+7u/jxrWrmeuKx195Vf9zC6NTlfhso6 QTXcnwK0UJm+vmdB7/j5yktBhJn/1+TkZzgAMB40Lai+NVsm/ktC6lKBEp+5Qif29o feCBfzaQQ2Oeg== Message-ID: <851b8c0884038fd496517cce61ef2c53b41ed8a2.camel@kernel.org> Subject: Re: [PATCH 1/2] NFSv4: Ensure test_and_free_stateid callers use private memory From: Jeff Layton To: Benjamin Coddington , Trond Myklebust , Anna Schumaker Cc: linux-nfs@vger.kernel.org Date: Wed, 23 Apr 2025 16:35:44 -0400 In-Reply-To: References: 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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nfs4_stateid's type which requires the const qualifier f= or > the nfs4_stateid to be dropped. Since it will no longer safe to operate > directly on shared stateid objects in this path, ensure that callers send= a > copy. > > Signed-off-by: Benjamin Coddington > --- > fs/nfs/nfs4proc.c | 12 +++++++----- > 1 file changed, 7 insertions(+), 5 deletions(-) >=20 > diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c > index 6e95db6c17e9..bfb9e980d662 100644 > --- a/fs/nfs/nfs4proc.c > +++ b/fs/nfs/nfs4proc.c > @@ -2990,6 +2990,7 @@ static void nfs41_delegation_recover_stateid(struct= nfs4_state *state) > static int nfs41_check_expired_locks(struct nfs4_state *state) > { > int status, ret =3D NFS_OK; > + nfs4_stateid stateid; > struct nfs4_lock_state *lsp, *prev =3D NULL; > struct nfs_server *server =3D NFS_SERVER(state->inode); > =20 > @@ -3007,9 +3008,9 @@ static int nfs41_check_expired_locks(struct nfs4_st= ate *state) > nfs4_put_lock_state(prev); > prev =3D lsp; > =20 > + nfs4_stateid_copy(&stateid, &lsp->ls_stateid); > status =3D nfs41_test_and_free_expired_stateid(server, > - &lsp->ls_stateid, > - cred); > + &stateid, cred); > trace_nfs4_test_lock_stateid(state, lsp, status); > if (status =3D=3D -NFS4ERR_EXPIRED || > status =3D=3D -NFS4ERR_BAD_STATEID) { > @@ -3042,17 +3043,18 @@ static int nfs41_check_expired_locks(struct nfs4_= state *state) > static int nfs41_check_open_stateid(struct nfs4_state *state) > { > struct nfs_server *server =3D NFS_SERVER(state->inode); > - nfs4_stateid *stateid =3D &state->open_stateid; > + nfs4_stateid stateid; > const struct cred *cred =3D state->owner->so_cred; > int status; > =20 > if (test_bit(NFS_OPEN_STATE, &state->flags) =3D=3D 0) > return -NFS4ERR_BAD_STATEID; > - status =3D nfs41_test_and_free_expired_stateid(server, stateid, cred); > + nfs4_stateid_copy(&stateid, &state->open_stateid); > + status =3D nfs41_test_and_free_expired_stateid(server, &stateid, cred); > trace_nfs4_test_open_stateid(state, NULL, status); > if (status =3D=3D -NFS4ERR_EXPIRED || status =3D=3D -NFS4ERR_BAD_STATEI= D) { > nfs_state_clear_open_state_flags(state); > - stateid->type =3D NFS4_INVALID_STATEID_TYPE; > + state->open_stateid.type =3D NFS4_INVALID_STATEID_TYPE; > return status; > } > if (nfs_open_stateid_recover_openmode(state)) I don't know that you really need to do this. In the cases where you end up setting the type to FREED, you will also return NFS4ERR_EXPIRED, which will make the callers set the type to INVALID. There will be a brief window where the type will be set to FREED, but that should be no big deal. --=20 Jeff Layton