qemu/0318-scsi-Allocate-SCSITargetReq-r-buf-dynamically.patch
2013-10-06 14:47:27 -04:00

156 lines
5.0 KiB
Diff

From e2fbed46dae80551daf1b8269cab5f6b586bd0d7 Mon Sep 17 00:00:00 2001
From: Asias He <asias@redhat.com>
Date: Fri, 13 Sep 2013 14:56:55 +0800
Subject: [PATCH] scsi: Allocate SCSITargetReq r->buf dynamically
BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1007330
Brew: https://brewweb.devel.redhat.com/taskinfo?taskID=6282465
This is the backport of the following commit. The patch is not
sent public since it is a embargoed bug.
r->buf is hardcoded to 2056 which is (256 + 1) * 8, allowing 256 luns at
most. If more than 256 luns are specified by user, we have buffer
overflow in scsi_target_emulate_report_luns.
To fix, we allocate the buffer dynamically.
Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
*s/&r->buf/r->buf/ due to type change
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
(cherry picked from commit fdcbe7d587a64dec0db0d3c9a3b230c39efbfeef)
---
hw/scsi-bus.c | 44 +++++++++++++++++++++++++++++++++-----------
hw/scsi.h | 2 ++
2 files changed, 35 insertions(+), 11 deletions(-)
diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c
index 01e1dec..54c9596 100644
--- a/hw/scsi-bus.c
+++ b/hw/scsi-bus.c
@@ -11,6 +11,8 @@ static char *scsibus_get_dev_path(DeviceState *dev);
static char *scsibus_get_fw_dev_path(DeviceState *dev);
static int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf);
static void scsi_req_dequeue(SCSIRequest *req);
+static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len);
+static void scsi_target_free_buf(SCSIRequest *req);
static Property scsi_props[] = {
DEFINE_PROP_UINT32("channel", SCSIDevice, channel, 0),
@@ -304,7 +306,8 @@ typedef struct SCSITargetReq SCSITargetReq;
struct SCSITargetReq {
SCSIRequest req;
int len;
- uint8_t buf[2056];
+ uint8_t *buf;
+ int buf_len;
};
static void store_lun(uint8_t *outbuf, int lun)
@@ -348,14 +351,12 @@ static bool scsi_target_emulate_report_luns(SCSITargetReq *r)
if (!found_lun0) {
n += 8;
}
- len = MIN(n + 8, r->req.cmd.xfer & ~7);
- if (len > sizeof(r->buf)) {
- /* TODO: > 256 LUNs? */
- return false;
- }
+ scsi_target_alloc_buf(&r->req, n + 8);
+
+ len = MIN(n + 8, r->req.cmd.xfer & ~7);
memset(r->buf, 0, len);
- stl_be_p(&r->buf, n);
+ stl_be_p(r->buf, n);
i = found_lun0 ? 8 : 16;
QTAILQ_FOREACH(kid, &r->req.bus->qbus.children, sibling) {
DeviceState *qdev = kid->child;
@@ -374,6 +375,9 @@ static bool scsi_target_emulate_report_luns(SCSITargetReq *r)
static bool scsi_target_emulate_inquiry(SCSITargetReq *r)
{
assert(r->req.dev->lun != r->req.lun);
+
+ scsi_target_alloc_buf(&r->req, SCSI_INQUIRY_LEN);
+
if (r->req.cmd.buf[1] & 0x2) {
/* Command support data - optional, not implemented */
return false;
@@ -398,7 +402,7 @@ static bool scsi_target_emulate_inquiry(SCSITargetReq *r)
return false;
}
/* done with EVPD */
- assert(r->len < sizeof(r->buf));
+ assert(r->len < r->buf_len);
r->len = MIN(r->req.cmd.xfer, r->len);
return true;
}
@@ -442,8 +446,8 @@ static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
}
break;
case REQUEST_SENSE:
- r->len = scsi_device_get_sense(r->req.dev, r->buf,
- MIN(req->cmd.xfer, sizeof r->buf),
+ scsi_target_alloc_buf(&r->req, SCSI_SENSE_LEN);
+ r->len = scsi_device_get_sense(r->req.dev, r->buf, r->buf_len,
(req->cmd.buf[1] & 1) == 0);
if (r->req.dev->sense_is_ua) {
scsi_device_unit_attention_reported(req->dev);
@@ -488,11 +492,29 @@ static uint8_t *scsi_target_get_buf(SCSIRequest *req)
return r->buf;
}
+static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len)
+{
+ SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
+
+ r->buf = g_malloc(len);
+ r->buf_len = len;
+
+ return r->buf;
+}
+
+static void scsi_target_free_buf(SCSIRequest *req)
+{
+ SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
+
+ g_free(r->buf);
+}
+
static const struct SCSIReqOps reqops_target_command = {
.size = sizeof(SCSITargetReq),
.send_command = scsi_target_send_command,
.read_data = scsi_target_read_data,
.get_buf = scsi_target_get_buf,
+ .free_req = scsi_target_free_buf,
};
@@ -1348,7 +1370,7 @@ int scsi_build_sense(uint8_t *in_buf, int in_len,
buf[7] = 10;
buf[12] = sense.asc;
buf[13] = sense.ascq;
- return MIN(len, 18);
+ return MIN(len, SCSI_SENSE_LEN);
} else {
/* Return descriptor format sense buffer */
buf[0] = 0x72;
diff --git a/hw/scsi.h b/hw/scsi.h
index a5b5b2e..d6028bf 100644
--- a/hw/scsi.h
+++ b/hw/scsi.h
@@ -9,6 +9,8 @@
#define MAX_SCSI_DEVS 255
#define SCSI_CMD_BUF_SIZE 16
+#define SCSI_SENSE_LEN 18
+#define SCSI_INQUIRY_LEN 36
typedef struct SCSIBus SCSIBus;
typedef struct SCSIBusInfo SCSIBusInfo;