[{"id":3675247,"web_url":"http://patchwork.ozlabs.org/comment/3675247/","msgid":"","list_archive_url":null,"date":"2026-04-09T10:49:01","subject":"Re: [PULL 1/1] virtio-scsi: pass the same cdb_size to\n virtio_scsi_pop_req and virtio_scsi_handle_cmd_req_prepare","submitter":{"id":2694,"url":"http://patchwork.ozlabs.org/api/people/2694/","name":"Daniel P. Berrangé","email":"berrange@redhat.com"},"content":"On Thu, Apr 09, 2026 at 12:33:09PM +0200, Paolo Bonzini wrote:\n> Ensure that there is no allocation/usage mismatch when requests\n> are processed in virtio_scsi_handle_cmd_vq. To do this,\n> retrieve the value once and pass it to both functions.\n> \n> For other calls to virtio_scsi_pop_req the extra size\n> can be 0, because control and event requests fit\n> entirely in VirtIOSCSIReq.\n> \n> Reported-by: Jihe Wang \n> Tested-by: Jihe Wang \n> Reviewed-by: Stefan Hajnoczi \n> Signed-off-by: Paolo Bonzini \n> ---\n> hw/scsi/virtio-scsi.c | 26 +++++++++++++++-----------\n> 1 file changed, 15 insertions(+), 11 deletions(-)\n\nThis issue is tagged CVE-2026-5763 - if possible can we get that\nin the commit message before merging.\n\n> \n> diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c\n> index 774968d8c70..6c737680119 100644\n> --- a/hw/scsi/virtio-scsi.c\n> +++ b/hw/scsi/virtio-scsi.c\n> @@ -227,16 +227,16 @@ static int virtio_scsi_parse_req(VirtIOSCSIReq *req,\n> return 0;\n> }\n> \n> -static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq, QemuMutex *vq_lock)\n> +static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq, size_t extra_req_size,\n> + QemuMutex *vq_lock)\n> {\n> - VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s;\n> VirtIOSCSIReq *req;\n> \n> if (vq_lock) {\n> qemu_mutex_lock(vq_lock);\n> }\n> \n> - req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + vs->cdb_size);\n> + req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + extra_req_size);\n> \n> if (vq_lock) {\n> qemu_mutex_unlock(vq_lock);\n> @@ -682,7 +682,7 @@ static void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq)\n> {\n> VirtIOSCSIReq *req;\n> \n> - while ((req = virtio_scsi_pop_req(s, vq, &s->ctrl_lock))) {\n> + while ((req = virtio_scsi_pop_req(s, vq, 0, &s->ctrl_lock))) {\n> virtio_scsi_handle_ctrl_req(s, req);\n> }\n> }\n> @@ -850,13 +850,14 @@ static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)\n> virtio_scsi_complete_cmd_req(req);\n> }\n> \n> -static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req)\n> +static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req,\n> + size_t cdb_size)\n> {\n> VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);\n> SCSIDevice *d;\n> int rc;\n> \n> - rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,\n> + rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + cdb_size,\n> sizeof(VirtIOSCSICmdResp) + vs->sense_size);\n> if (rc < 0) {\n> if (rc == -ENOTSUP) {\n> @@ -878,7 +879,7 @@ static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req)\n> }\n> req->sreq = scsi_req_new(d, req->req.cmd.tag,\n> virtio_scsi_get_lun(req->req.cmd.lun),\n> - req->req.cmd.cdb, vs->cdb_size, req);\n> + req->req.cmd.cdb, cdb_size, req);\n> \n> if (req->sreq->cmd.mode != SCSI_XFER_NONE\n> && (req->sreq->cmd.mode != req->mode ||\n> @@ -913,12 +914,15 @@ static void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq)\n> QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs);\n> \n> do {\n> + VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s;\n> + size_t cdb_size = qatomic_read(&vs->cdb_size);\n> +\n> if (suppress_notifications) {\n> virtio_queue_set_notification(vq, 0);\n> }\n> \n> - while ((req = virtio_scsi_pop_req(s, vq, NULL))) {\n> - ret = virtio_scsi_handle_cmd_req_prepare(s, req);\n> + while ((req = virtio_scsi_pop_req(s, vq, cdb_size, NULL))) {\n> + ret = virtio_scsi_handle_cmd_req_prepare(s, req, cdb_size);\n> if (!ret) {\n> QTAILQ_INSERT_TAIL(&reqs, req, next);\n> } else if (ret == -EINVAL) {\n> @@ -989,7 +993,7 @@ static void virtio_scsi_set_config(VirtIODevice *vdev,\n> }\n> \n> vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size);\n> - vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size);\n> + qatomic_set(&vs->cdb_size, virtio_ldl_p(vdev, &scsiconf->cdb_size));\n> }\n> \n> static uint64_t virtio_scsi_get_features(VirtIODevice *vdev,\n> @@ -1050,7 +1054,7 @@ static void virtio_scsi_push_event(VirtIOSCSI *s,\n> return;\n> }\n> \n> - req = virtio_scsi_pop_req(s, vs->event_vq, &s->event_lock);\n> + req = virtio_scsi_pop_req(s, vs->event_vq, 0, &s->event_lock);\n> WITH_QEMU_LOCK_GUARD(&s->event_lock) {\n> if (!req) {\n> s->events_dropped = true;\n> -- \n> 2.53.0\n> \n> \n\nWith regards,\nDaniel","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=PGWJF1zF;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Berrangé wrote:\n>\n> On Thu, Apr 09, 2026 at 12:33:09PM +0200, Paolo Bonzini wrote:\n> > Ensure that there is no allocation/usage mismatch when requests\n> > are processed in virtio_scsi_handle_cmd_vq. To do this,\n> > retrieve the value once and pass it to both functions.\n> >\n> > For other calls to virtio_scsi_pop_req the extra size\n> > can be 0, because control and event requests fit\n> > entirely in VirtIOSCSIReq.\n> >\n> > Reported-by: Jihe Wang \n> > Tested-by: Jihe Wang \n> > Reviewed-by: Stefan Hajnoczi \n> > Signed-off-by: Paolo Bonzini \n> > ---\n> > hw/scsi/virtio-scsi.c | 26 +++++++++++++++-----------\n> > 1 file changed, 15 insertions(+), 11 deletions(-)\n>\n> This issue is tagged CVE-2026-5763 - if possible can we get that\n> in the commit message before merging.\n\nDone, new commit hash is 79971302935472232a68073faddb085177e3ca54.\n\nPaolo","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=GjfrXOAy;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=r1bv6xqS;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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