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 B62C015A846; Tue, 18 Jun 2024 13:18:20 +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=1718716701; cv=none; b=gMZboK1s4JVC6TXiJlj214R/l5MwkNsChjzr30aMFCDh6BTjBAYH47sg11B7wy9Dhkv3Md8WuaCmQ/MeGS604ZUJSwF/7WxFUETu1QJZUi4Hk10npzzoifxF555ZY1Gf0xjdbBNV6QMVCLcn0iieTSm6/Dos1yBoJxTeDxxCH2g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718716701; c=relaxed/simple; bh=ho4LTk+qjsA4vddtKNEOe8Ji/CUyAgbn/baNnqQXa8s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ts2jYwEAi1bipIpEBKZCpqFupYKSy5wy8+KYyEOdFAL6GTwfiHlvOR0+z7g2glc7fakUQYkTrenLcRvU4mXXA+yuiO4VsYyT+aPpCzn/ejdjatgwYdLQm33v9PWob/R0bCpnEkbXvjRXckExWh2TATjVxhGfaxExB/E/Wcy0CnI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Wg1ftchd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Wg1ftchd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DAB75C3277B; Tue, 18 Jun 2024 13:18:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1718716700; bh=ho4LTk+qjsA4vddtKNEOe8Ji/CUyAgbn/baNnqQXa8s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Wg1ftchdw8T8BkzutPFcrI+36/oyx1WYT1hls7U8w6qCzBro/yCOV/w6Ynecro9GF aGcscGWurhdWHuqJqM5F2n0+DGVuy/hvI5oDdKNH8r3wa903imAp1Wt5PrpxrPhaII G5oMslB9B/3KDgKBez/sCIayH12T/cNn4kN2/GVI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Boyang Xue , Jeff Layton , Chuck Lever , Sasha Levin Subject: [PATCH 5.10 734/770] nfsd: dont hand out delegation on setuid files being opened for write Date: Tue, 18 Jun 2024 14:39:47 +0200 Message-ID: <20240618123435.598972907@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240618123407.280171066@linuxfoundation.org> References: <20240618123407.280171066@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jeff Layton [ Upstream commit 826b67e6376c2a788e3a62c4860dcd79500a27d5 ] We had a bug report that xfstest generic/355 was failing on NFSv4.0. This test sets various combinations of setuid/setgid modes and tests whether DIO writes will cause them to be stripped. What I found was that the server did properly strip those bits, but the client didn't notice because it held a delegation that was not recalled. The recall didn't occur because the client itself was the one generating the activity and we avoid recalls in that case. Clearing setuid bits is an "implicit" activity. The client didn't specifically request that we do that, so we need the server to issue a CB_RECALL, or avoid the situation entirely by not issuing a delegation. The easiest fix here is to simply not give out a delegation if the file is being opened for write, and the mode has the setuid and/or setgid bit set. Note that there is a potential race between the mode and lease being set, so we test for this condition both before and after setting the lease. This patch fixes generic/355, generic/683 and generic/684 for me. (Note that 355 fails only on v4.0, and 683 and 684 require NFSv4.2 to run and fail). Reported-by: Boyang Xue Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- fs/nfsd/nfs4state.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 2733eb33d5df2..f57137ef306bd 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -5435,6 +5435,23 @@ nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp, return 0; } +/* + * We avoid breaking delegations held by a client due to its own activity, but + * clearing setuid/setgid bits on a write is an implicit activity and the client + * may not notice and continue using the old mode. Avoid giving out a delegation + * on setuid/setgid files when the client is requesting an open for write. + */ +static int +nfsd4_verify_setuid_write(struct nfsd4_open *open, struct nfsd_file *nf) +{ + struct inode *inode = file_inode(nf->nf_file); + + if ((open->op_share_access & NFS4_SHARE_ACCESS_WRITE) && + (inode->i_mode & (S_ISUID|S_ISGID))) + return -EAGAIN; + return 0; +} + static struct nfs4_delegation * nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp, struct svc_fh *parent) @@ -5468,6 +5485,8 @@ nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp, spin_lock(&fp->fi_lock); if (nfs4_delegation_exists(clp, fp)) status = -EAGAIN; + else if (nfsd4_verify_setuid_write(open, nf)) + status = -EAGAIN; else if (!fp->fi_deleg_file) { fp->fi_deleg_file = nf; /* increment early to prevent fi_deleg_file from being @@ -5508,6 +5527,14 @@ nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp, if (status) goto out_unlock; + /* + * Now that the deleg is set, check again to ensure that nothing + * raced in and changed the mode while we weren't lookng. + */ + status = nfsd4_verify_setuid_write(open, fp->fi_deleg_file); + if (status) + goto out_unlock; + spin_lock(&state_lock); spin_lock(&fp->fi_lock); if (fp->fi_had_conflict) -- 2.43.0