xen/disk: don't leak stack data via response ring

Rather than constructing a local structure instance on the stack, fill
the fields directly on the shared ring, just like other (Linux)
backends do. Build on the fact that all response structure flavors are
actually identical (the old code did make this assumption too).

This is XSA-216.

Reported-by: Anthony Perard <anthony.perard@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>

diff --git a/hw/block/xen_blkif.h b/hw/block/xen_blkif.h
index 3300b6fc0a8e99be233669edda2bdf108add5f56..0554b945f6085f1f51092e54e9c0f19b2d143c32 100644 (file)
--- a/hw/block/xen_blkif.h
+++ b/hw/block/xen_blkif.h
@@ -14,9 +14,6 @@
 struct blkif_common_request {
     char dummy;
 };
-struct blkif_common_response {
-    char dummy;
-};
 
 /* i386 protocol version */
 #pragma pack(push, 4)
@@ -36,13 +33,7 @@ struct blkif_x86_32_request_discard {
     blkif_sector_t sector_number;    /* start sector idx on disk (r/w only)  */
     uint64_t       nr_sectors;       /* # of contiguous sectors to discard   */
 };
-struct blkif_x86_32_response {
-    uint64_t        id;              /* copied from request */
-    uint8_t         operation;       /* copied from request */
-    int16_t         status;          /* BLKIF_RSP_???       */
-};
 typedef struct blkif_x86_32_request blkif_x86_32_request_t;
-typedef struct blkif_x86_32_response blkif_x86_32_response_t;
 #pragma pack(pop)
 
 /* x86_64 protocol version */
@@ -62,20 +53,14 @@ struct blkif_x86_64_request_discard {
     blkif_sector_t sector_number;    /* start sector idx on disk (r/w only)  */
     uint64_t       nr_sectors;       /* # of contiguous sectors to discard   */
 };
-struct blkif_x86_64_response {
-    uint64_t       __attribute__((__aligned__(8))) id;
-    uint8_t         operation;       /* copied from request */
-    int16_t         status;          /* BLKIF_RSP_???       */
-};
 typedef struct blkif_x86_64_request blkif_x86_64_request_t;
-typedef struct blkif_x86_64_response blkif_x86_64_response_t;
 
 DEFINE_RING_TYPES(blkif_common, struct blkif_common_request,
-                  struct blkif_common_response);
+                  struct blkif_response);
 DEFINE_RING_TYPES(blkif_x86_32, struct blkif_x86_32_request,
-                  struct blkif_x86_32_response);
+                  struct blkif_response QEMU_PACKED);
 DEFINE_RING_TYPES(blkif_x86_64, struct blkif_x86_64_request,
-                  struct blkif_x86_64_response);
+                  struct blkif_response);
 
 union blkif_back_rings {
     blkif_back_ring_t        native;

diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c
index 456a2d569492e5428fefe84ddcb7f792298ffd0b..33a51cc66f05ebb85bb91ad05247907dc2ccb6bf 100644 (file)
--- a/hw/block/xen_disk.c
+++ b/hw/block/xen_disk.c
@@ -769,31 +769,30 @@ static int blk_send_response_one(struct ioreq *ioreq)
     struct XenBlkDev  *blkdev = ioreq->blkdev;
     int               send_notify   = 0;
     int               have_requests = 0;
-    blkif_response_t  resp;
-    void              *dst;
-
-    resp.id        = ioreq->req.id;
-    resp.operation = ioreq->req.operation;
-    resp.status    = ioreq->status;
+    blkif_response_t  *resp;
 
     /* Place on the response ring for the relevant domain. */
     switch (blkdev->protocol) {
     case BLKIF_PROTOCOL_NATIVE:
-        dst = RING_GET_RESPONSE(&blkdev->rings.native, blkdev->rings.native.rsp_prod_pvt);
+        resp = RING_GET_RESPONSE(&blkdev->rings.native,
+                                 blkdev->rings.native.rsp_prod_pvt);
         break;
     case BLKIF_PROTOCOL_X86_32:
-        dst = RING_GET_RESPONSE(&blkdev->rings.x86_32_part,
-                                blkdev->rings.x86_32_part.rsp_prod_pvt);
+        resp = RING_GET_RESPONSE(&blkdev->rings.x86_32_part,
+                                 blkdev->rings.x86_32_part.rsp_prod_pvt);
         break;
     case BLKIF_PROTOCOL_X86_64:
-        dst = RING_GET_RESPONSE(&blkdev->rings.x86_64_part,
-                                blkdev->rings.x86_64_part.rsp_prod_pvt);
+        resp = RING_GET_RESPONSE(&blkdev->rings.x86_64_part,
+                                 blkdev->rings.x86_64_part.rsp_prod_pvt);
         break;
     default:
-        dst = NULL;
         return 0;
     }
-    memcpy(dst, &resp, sizeof(resp));
+
+    resp->id        = ioreq->req.id;
+    resp->operation = ioreq->req.operation;
+    resp->status    = ioreq->status;
+
     blkdev->rings.common.rsp_prod_pvt++;
 
     RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&blkdev->rings.common, send_notify);