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 691FC3925A for ; Wed, 7 Jun 2023 20:21:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA4AAC4339B; Wed, 7 Jun 2023 20:21:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1686169266; bh=D5VTqr5ulOBjssvO6c+3ZgE5wL9xut81xojr8puHmiA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ppEYybcHj+FN4+EepR6/fm0/qVvtkVoeymsLP/KU4hfAWWjjSyJNHnsf5Tj55ry/K jtAqVNNPb1x0+msbbU8MNPfeAuNmJNH+YndMDkSNQU1J1LGcG4smk6oPzX91KDTJ9D fRF+AyS054gr4I+cLRnjhND9jmWHTXJBmffITZ7c= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhi Li , Jeff Layton , Chuck Lever , Sasha Levin Subject: [PATCH 6.3 016/286] nfsd: make a copy of struct iattr before calling notify_change Date: Wed, 7 Jun 2023 22:11:55 +0200 Message-ID: <20230607200923.538751938@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230607200922.978677727@linuxfoundation.org> References: <20230607200922.978677727@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jeff Layton [ Upstream commit d53d70084d27f56bcdf5074328f2c9ec861be596 ] notify_change can modify the iattr structure. In particular it can end up setting ATTR_MODE when ATTR_KILL_SUID is already set, causing a BUG() if the same iattr is passed to notify_change more than once. Make a copy of the struct iattr before calling notify_change. Reported-by: Zhi Li Link: https://bugzilla.redhat.com/show_bug.cgi?id=2207969 Tested-by: Zhi Li Fixes: 34b91dda7124 ("NFSD: Make nfsd4_setattr() wait before returning NFS4ERR_DELAY") Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- fs/nfsd/vfs.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 5783209f17fc5..e4884dde048ce 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -536,7 +536,15 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, inode_lock(inode); for (retries = 1;;) { - host_err = __nfsd_setattr(dentry, iap); + struct iattr attrs; + + /* + * notify_change() can alter its iattr argument, making + * @iap unsuitable for submission multiple times. Make a + * copy for every loop iteration. + */ + attrs = *iap; + host_err = __nfsd_setattr(dentry, &attrs); if (host_err != -EAGAIN || !retries--) break; if (!nfsd_wait_for_delegreturn(rqstp, inode)) -- 2.39.2