From: Juergen Gross jgross@suse.com
commit b94e4b147fd1992ad450e1fea1fdaa3738753373 upstream.
Today blkfront will trust the backend to send only sane response data. In order to avoid privilege escalations or crashes in case of malicious backends verify the data to be within expected limits. Especially make sure that the response always references an outstanding request.
Introduce a new state of the ring BLKIF_STATE_ERROR which will be switched to in case an inconsistency is being detected. Recovering from this state is possible only via removing and adding the virtual device again (e.g. via a suspend/resume cycle).
Make all warning messages issued due to valid error responses rate limited in order to avoid message floods being triggered by a malicious backend.
Signed-off-by: Juergen Gross jgross@suse.com Reviewed-by: Jan Beulich jbeulich@suse.com Acked-by: Roger Pau Monné roger.pau@citrix.com Link: https://lore.kernel.org/r/20210730103854.12681-4-jgross@suse.com Signed-off-by: Juergen Gross jgross@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/block/xen-blkfront.c | 57 ++++++++++++++++++++++++++++++++++--------- 1 file changed, 46 insertions(+), 11 deletions(-)
--- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -64,6 +64,7 @@ enum blkif_state { BLKIF_STATE_DISCONNECTED, BLKIF_STATE_CONNECTED, BLKIF_STATE_SUSPENDED, + BLKIF_STATE_ERROR, };
struct grant { @@ -79,6 +80,7 @@ struct blk_shadow { struct grant **indirect_grants; struct scatterlist *sg; unsigned int num_sg; + bool inflight; };
struct split_bio { @@ -495,6 +497,7 @@ static int blkif_queue_discard_req(struc
/* Copy the request to the ring page. */ *final_ring_req = *ring_req; + info->shadow[id].inflight = true;
return 0; } @@ -712,6 +715,7 @@ static int blkif_queue_rw_req(struct req
/* Copy request(s) to the ring page. */ *final_ring_req = *ring_req; + info->shadow[id].inflight = true;
if (new_persistent_gnts) gnttab_free_grant_references(setup.gref_head); @@ -1324,11 +1328,17 @@ static irqreturn_t blkif_interrupt(int i }
again: - rp = info->ring.sring->rsp_prod; + rp = READ_ONCE(info->ring.sring->rsp_prod); rmb(); /* Ensure we see queued responses up to 'rp'. */ + if (RING_RESPONSE_PROD_OVERFLOW(&info->ring, rp)) { + pr_alert("%s: illegal number of responses %u\n", + info->gd->disk_name, rp - info->ring.rsp_cons); + goto err; + }
for (i = info->ring.rsp_cons; i != rp; i++) { unsigned long id; + unsigned int op;
RING_COPY_RESPONSE(&info->ring, i, &bret); id = bret.id; @@ -1339,14 +1349,28 @@ static irqreturn_t blkif_interrupt(int i * look in get_id_from_freelist. */ if (id >= BLK_RING_SIZE(info)) { - WARN(1, "%s: response to %s has incorrect id (%ld)\n", - info->gd->disk_name, op_name(bret.operation), id); - /* We can't safely get the 'struct request' as - * the id is busted. */ - continue; + pr_alert("%s: response has incorrect id (%ld)\n", + info->gd->disk_name, id); + goto err; + } + if (!info->shadow[id].inflight) { + pr_alert("%s: response references no pending request\n", + info->gd->disk_name); + goto err; } + + info->shadow[id].inflight = false; req = info->shadow[id].request;
+ op = info->shadow[id].req.operation; + if (op == BLKIF_OP_INDIRECT) + op = info->shadow[id].req.u.indirect.indirect_op; + if (bret.operation != op) { + pr_alert("%s: response has wrong operation (%u instead of %u)\n", + info->gd->disk_name, bret.operation, op); + goto err; + } + if (bret.operation != BLKIF_OP_DISCARD) blkif_completion(&info->shadow[id], info, &bret);
@@ -1361,7 +1385,8 @@ static irqreturn_t blkif_interrupt(int i case BLKIF_OP_DISCARD: if (unlikely(bret.status == BLKIF_RSP_EOPNOTSUPP)) { struct request_queue *rq = info->rq; - printk(KERN_WARNING "blkfront: %s: %s op failed\n", + + pr_warn_ratelimited("blkfront: %s: %s op failed\n", info->gd->disk_name, op_name(bret.operation)); error = -EOPNOTSUPP; info->feature_discard = 0; @@ -1374,13 +1399,13 @@ static irqreturn_t blkif_interrupt(int i case BLKIF_OP_FLUSH_DISKCACHE: case BLKIF_OP_WRITE_BARRIER: if (unlikely(bret.status == BLKIF_RSP_EOPNOTSUPP)) { - printk(KERN_WARNING "blkfront: %s: %s op failed\n", + pr_warn_ratelimited("blkfront: %s: %s op failed\n", info->gd->disk_name, op_name(bret.operation)); error = -EOPNOTSUPP; } if (unlikely(bret.status == BLKIF_RSP_ERROR && info->shadow[id].req.u.rw.nr_segments == 0)) { - printk(KERN_WARNING "blkfront: %s: empty %s op failed\n", + pr_warn_ratelimited("blkfront: %s: empty %s op failed\n", info->gd->disk_name, op_name(bret.operation)); error = -EOPNOTSUPP; } @@ -1394,8 +1419,9 @@ static irqreturn_t blkif_interrupt(int i case BLKIF_OP_READ: case BLKIF_OP_WRITE: if (unlikely(bret.status != BLKIF_RSP_OKAY)) - dev_dbg(&info->xbdev->dev, "Bad return from blkdev data " - "request: %x\n", bret.status); + dev_dbg_ratelimited(&info->xbdev->dev, + "Bad return from blkdev data request: %x\n", + bret.status);
blk_mq_complete_request(req, error); break; @@ -1419,6 +1445,14 @@ static irqreturn_t blkif_interrupt(int i spin_unlock_irqrestore(&info->io_lock, flags);
return IRQ_HANDLED; + + err: + info->connected = BLKIF_STATE_ERROR; + + spin_unlock_irqrestore(&info->io_lock, flags); + + pr_alert("%s disabled for further use\n", info->gd->disk_name); + return IRQ_HANDLED; }
@@ -1928,6 +1962,7 @@ out_of_memory: info->shadow[i].sg = NULL; kfree(info->shadow[i].indirect_grants); info->shadow[i].indirect_grants = NULL; + info->shadow[i].inflight = false; } if (!list_empty(&info->indirect_pages)) { struct page *indirect_page, *n;