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 06343190071; Sun, 23 Jun 2024 13:44:58 +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=1719150299; cv=none; b=CiDX27cc+WNEcd2mKLHzpdA+edq/xTH9P/hh6i//nmZ88zJQA2ns3LKE8uPuT+1oUXZUUFUILKgVsoUcXMB1UfFx3929Xn8yexm6yZj8GJNr3eDEX0+uSsKGLfQAHoaHAlTCduVg14dOIAPGgxx/800E1y3x6SgiHLq0wa7OfRE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719150299; c=relaxed/simple; bh=JXifNuJFZLxzMxs/tL65AKn/n+CiUJ4hs5hZuDPTYHM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dh3+LhcFrJyEk/SP3UqnyDm/NmeFn0gseVdLB15Mw5uuO1k1ySXsHU3jskf9cwfxwnq03UHZakuLbAoGJogxhnNkRiXz8jTmuKJlzlu0Rc/KTkVzKxT41N21rBnLfPNUqhvDJKypjanuC0kYAxqEXTorEJ+VlApdunlnF2XpTWM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UVspDbau; 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="UVspDbau" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B436C4AF0E; Sun, 23 Jun 2024 13:44:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719150298; bh=JXifNuJFZLxzMxs/tL65AKn/n+CiUJ4hs5hZuDPTYHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UVspDbauxetUMdxKYCR5bdwkrQ+PqVUDSM/ZrSwgstG+5dBWitfq0lnjD4cchA8Tj psgTJIb44NUEA2DTTux2a6YTlsfNxbZ57aOsixJUz/NAQ3BiECzi0W06oVyl+lbGJF HCZl2OrIvpNufusoT4sQWa8KE8ryUhjxQ7Snh0vI39o6PSTt2gq4rISJ2GQCYRsLml Yrgn2HcArvFzCqyyGjdN1vWhiKTzwYNIRd6lKIHHMQbH4JwLiXY5p7Al2sIOj8L1mV ukOv/NODlIMuPBmSDJPFrxwKltewvwdJBX3+7ufMwz0cz4hzbo7jF38hBlhtprd7Gu IDpBc1CaPOzmA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zizhi Wo , Baokun Li , Jeff Layton , Jia Zhu , Christian Brauner , Sasha Levin , dhowells@redhat.com, netfs@lists.linux.dev Subject: [PATCH AUTOSEL 6.6 06/16] cachefiles: Set object to close if ondemand_id < 0 in copen Date: Sun, 23 Jun 2024 09:44:35 -0400 Message-ID: <20240623134448.809470-6-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240623134448.809470-1-sashal@kernel.org> References: <20240623134448.809470-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: netfs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.35 Content-Transfer-Encoding: 8bit From: Zizhi Wo [ Upstream commit 4f8703fb3482f92edcfd31661857b16fec89c2c0 ] If copen is maliciously called in the user mode, it may delete the request corresponding to the random id. And the request may have not been read yet. Note that when the object is set to reopen, the open request will be done with the still reopen state in above case. As a result, the request corresponding to this object is always skipped in select_req function, so the read request is never completed and blocks other process. Fix this issue by simply set object to close if its id < 0 in copen. Signed-off-by: Zizhi Wo Signed-off-by: Baokun Li Link: https://lore.kernel.org/r/20240522114308.2402121-11-libaokun@huaweicloud.com Acked-by: Jeff Layton Reviewed-by: Jia Zhu Signed-off-by: Christian Brauner Signed-off-by: Sasha Levin --- fs/cachefiles/ondemand.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c index b8e9cdc93643e..0862d69d64759 100644 --- a/fs/cachefiles/ondemand.c +++ b/fs/cachefiles/ondemand.c @@ -182,6 +182,7 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args) xas_store(&xas, NULL); xa_unlock(&cache->reqs); + info = req->object->ondemand; /* fail OPEN request if copen format is invalid */ ret = kstrtol(psize, 0, &size); if (ret) { @@ -201,7 +202,6 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args) goto out; } - info = req->object->ondemand; spin_lock(&info->lock); /* * The anonymous fd was closed before copen ? Fail the request. @@ -241,6 +241,11 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args) wake_up_all(&cache->daemon_pollwq); out: + spin_lock(&info->lock); + /* Need to set object close to avoid reopen status continuing */ + if (info->ondemand_id == CACHEFILES_ONDEMAND_ID_CLOSED) + cachefiles_ondemand_set_object_close(req->object); + spin_unlock(&info->lock); complete(&req->done); return ret; } -- 2.43.0