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 9F99823507E; Tue, 29 Apr 2025 23:50:47 +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=1745970647; cv=none; b=QXB9OGPP7hMfzxYBbCcJZyCjwgyRC8rCAN8V7YYbC7HofpxEPpJ8GoZ/0SIzQ6PfTnDABkYuJLuX94T2rtFy/dslX12nP8cZddcBvp8mnt2qJHnHvn17Bu0Rdli3Lr6WhH9k2lbex0mgoJA/W4/gX3oIWLQPN4or6wKkoT02txE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745970647; c=relaxed/simple; bh=1gdYAgF4o2X+INtJu0Fcctni83UjSMMe6r/sreDBkEc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=XUK+tk+m1pzbiovuyJT73HCHrtAQz3xVhx7S4QaEZrIJt1AHRFfSALc8p655aS6K9bRH6q0D/xDi7dvRHPDL6fD1PtES4hkvfW7szJ3NKfX5N8S+r3kFHcE44R8t9rmAFDpl+aqU+J0iqoKG44HBHj/hq79W9Tg5DqxSmO4e+ro= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PzvTQBWi; 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="PzvTQBWi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4C4BAC4CEE3; Tue, 29 Apr 2025 23:50:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745970647; bh=1gdYAgF4o2X+INtJu0Fcctni83UjSMMe6r/sreDBkEc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PzvTQBWiJ7mbhiybGk9pTIpWDFbJWmvMdJcpJLmZLAK8MPDNtL4JnbjCh3yZbYF5b Nmr5tqbR+kU+8PMJ57UEp9jYUQo+QReASyBbThgijZtwNatQqpdlD+YwBM4SC8ODi1 iZ8gg2U92QaazZ2UIpnvOjfakHC5CvvDfREH/WBQGqN3ksRKJYHuY/s1uex89d9CAU sVAf+bRf9nnKi5dRawq4Y9Rd9PqFqNhoboK2Fuhw2GAj0sYZfnTNOtRthNC1SA4mPi d1DuYAAAyWCFRr+BHe+lpxzmiSBpOMZ8Vbw6BsMDxQhanJX6lhhpW1lkjfa7jr7asi 7KqXpYvGbpESA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dongli Zhang , Jason Wang , Mike Christie , "Michael S . Tsirkin" , Sasha Levin , virtualization@lists.linux.dev, kvm@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 6.14 21/39] vhost-scsi: protect vq->log_used with vq->mutex Date: Tue, 29 Apr 2025 19:49:48 -0400 Message-Id: <20250429235006.536648-21-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250429235006.536648-1-sashal@kernel.org> References: <20250429235006.536648-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.14.4 Content-Transfer-Encoding: 8bit From: Dongli Zhang [ Upstream commit f591cf9fce724e5075cc67488c43c6e39e8cbe27 ] The vhost-scsi completion path may access vq->log_base when vq->log_used is already set to false. vhost-thread QEMU-thread vhost_scsi_complete_cmd_work() -> vhost_add_used() -> vhost_add_used_n() if (unlikely(vq->log_used)) QEMU disables vq->log_used via VHOST_SET_VRING_ADDR. mutex_lock(&vq->mutex); vq->log_used = false now! mutex_unlock(&vq->mutex); QEMU gfree(vq->log_base) log_used() -> log_write(vq->log_base) Assuming the VMM is QEMU. The vq->log_base is from QEMU userpace and can be reclaimed via gfree(). As a result, this causes invalid memory writes to QEMU userspace. The control queue path has the same issue. Signed-off-by: Dongli Zhang Acked-by: Jason Wang Reviewed-by: Mike Christie Message-Id: <20250403063028.16045-2-dongli.zhang@oracle.com> Signed-off-by: Michael S. Tsirkin Signed-off-by: Sasha Levin --- drivers/vhost/scsi.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index 7aeff435c1d87..a71ad7353341e 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -571,6 +571,9 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work) int ret; llnode = llist_del_all(&svq->completion_list); + + mutex_lock(&svq->vq.mutex); + llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { se_cmd = &cmd->tvc_se_cmd; @@ -604,6 +607,8 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work) vhost_scsi_release_cmd_res(se_cmd); } + mutex_unlock(&svq->vq.mutex); + if (signal) vhost_signal(&svq->vs->dev, &svq->vq); } @@ -1297,8 +1302,11 @@ static void vhost_scsi_tmf_resp_work(struct vhost_work *work) else resp_code = VIRTIO_SCSI_S_FUNCTION_REJECTED; + mutex_lock(&tmf->svq->vq.mutex); vhost_scsi_send_tmf_resp(tmf->vhost, &tmf->svq->vq, tmf->in_iovs, tmf->vq_desc, &tmf->resp_iov, resp_code); + mutex_unlock(&tmf->svq->vq.mutex); + vhost_scsi_release_tmf_res(tmf); } -- 2.39.5