svn commit: r350285 - in releng: 11.2/usr.sbin/bhyve 11.3/usr.sbin/bhyve 12.0/usr.sbin/bhyve
Gordon Tetlow
gordon at FreeBSD.org
Wed Jul 24 12:56:08 UTC 2019
Author: gordon
Date: Wed Jul 24 12:56:06 2019
New Revision: 350285
URL: https://svnweb.freebsd.org/changeset/base/350285
Log:
Fix byhve out-of-bounds read in XHCI device.
Approved by: so
Security: FreeBSD-SA-19:16.bhyve
Security: CVE-2019-5604
Modified:
releng/11.2/usr.sbin/bhyve/pci_xhci.c
releng/11.3/usr.sbin/bhyve/pci_xhci.c
releng/12.0/usr.sbin/bhyve/pci_xhci.c
Modified: releng/11.2/usr.sbin/bhyve/pci_xhci.c
==============================================================================
--- releng/11.2/usr.sbin/bhyve/pci_xhci.c Wed Jul 24 12:55:16 2019 (r350284)
+++ releng/11.2/usr.sbin/bhyve/pci_xhci.c Wed Jul 24 12:56:06 2019 (r350285)
@@ -1898,6 +1898,11 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, ui
return;
}
+ if (epid == 0 || epid >= XHCI_MAX_ENDPOINTS) {
+ DPRINTF(("pci_xhci: invalid endpoint %u\r\n", epid));
+ return;
+ }
+
dev = XHCI_SLOTDEV_PTR(sc, slot);
devep = &dev->eps[epid];
dev_ctx = pci_xhci_get_dev_ctx(sc, slot);
@@ -1923,6 +1928,23 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, ui
/* get next trb work item */
if (XHCI_EPCTX_0_MAXP_STREAMS_GET(ep_ctx->dwEpCtx0) != 0) {
+ struct xhci_stream_ctx *sctx;
+
+ /*
+ * Stream IDs of 0, 65535 (any stream), and 65534
+ * (prime) are invalid.
+ */
+ if (streamid == 0 || streamid == 65534 || streamid == 65535) {
+ DPRINTF(("pci_xhci: invalid stream %u\r\n", streamid));
+ return;
+ }
+
+ sctx = NULL;
+ pci_xhci_find_stream(sc, ep_ctx, streamid, &sctx);
+ if (sctx == NULL) {
+ DPRINTF(("pci_xhci: invalid stream %u\r\n", streamid));
+ return;
+ }
sctx_tr = &devep->ep_sctx_trbs[streamid];
ringaddr = sctx_tr->ringaddr;
ccs = sctx_tr->ccs;
@@ -1931,6 +1953,10 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, ui
streamid, ep_ctx->qwEpCtx2 & XHCI_TRB_3_CYCLE_BIT,
trb->dwTrb3 & XHCI_TRB_3_CYCLE_BIT));
} else {
+ if (streamid != 0) {
+ DPRINTF(("pci_xhci: invalid stream %u\r\n", streamid));
+ return;
+ }
ringaddr = devep->ep_ringaddr;
ccs = devep->ep_ccs;
trb = devep->ep_tr;
Modified: releng/11.3/usr.sbin/bhyve/pci_xhci.c
==============================================================================
--- releng/11.3/usr.sbin/bhyve/pci_xhci.c Wed Jul 24 12:55:16 2019 (r350284)
+++ releng/11.3/usr.sbin/bhyve/pci_xhci.c Wed Jul 24 12:56:06 2019 (r350285)
@@ -1900,6 +1900,11 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, ui
return;
}
+ if (epid == 0 || epid >= XHCI_MAX_ENDPOINTS) {
+ DPRINTF(("pci_xhci: invalid endpoint %u\r\n", epid));
+ return;
+ }
+
dev = XHCI_SLOTDEV_PTR(sc, slot);
devep = &dev->eps[epid];
dev_ctx = pci_xhci_get_dev_ctx(sc, slot);
@@ -1925,6 +1930,23 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, ui
/* get next trb work item */
if (XHCI_EPCTX_0_MAXP_STREAMS_GET(ep_ctx->dwEpCtx0) != 0) {
+ struct xhci_stream_ctx *sctx;
+
+ /*
+ * Stream IDs of 0, 65535 (any stream), and 65534
+ * (prime) are invalid.
+ */
+ if (streamid == 0 || streamid == 65534 || streamid == 65535) {
+ DPRINTF(("pci_xhci: invalid stream %u\r\n", streamid));
+ return;
+ }
+
+ sctx = NULL;
+ pci_xhci_find_stream(sc, ep_ctx, streamid, &sctx);
+ if (sctx == NULL) {
+ DPRINTF(("pci_xhci: invalid stream %u\r\n", streamid));
+ return;
+ }
sctx_tr = &devep->ep_sctx_trbs[streamid];
ringaddr = sctx_tr->ringaddr;
ccs = sctx_tr->ccs;
@@ -1933,6 +1955,10 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, ui
streamid, ep_ctx->qwEpCtx2 & XHCI_TRB_3_CYCLE_BIT,
trb->dwTrb3 & XHCI_TRB_3_CYCLE_BIT));
} else {
+ if (streamid != 0) {
+ DPRINTF(("pci_xhci: invalid stream %u\r\n", streamid));
+ return;
+ }
ringaddr = devep->ep_ringaddr;
ccs = devep->ep_ccs;
trb = devep->ep_tr;
Modified: releng/12.0/usr.sbin/bhyve/pci_xhci.c
==============================================================================
--- releng/12.0/usr.sbin/bhyve/pci_xhci.c Wed Jul 24 12:55:16 2019 (r350284)
+++ releng/12.0/usr.sbin/bhyve/pci_xhci.c Wed Jul 24 12:56:06 2019 (r350285)
@@ -1900,6 +1900,11 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, ui
return;
}
+ if (epid == 0 || epid >= XHCI_MAX_ENDPOINTS) {
+ DPRINTF(("pci_xhci: invalid endpoint %u\r\n", epid));
+ return;
+ }
+
dev = XHCI_SLOTDEV_PTR(sc, slot);
devep = &dev->eps[epid];
dev_ctx = pci_xhci_get_dev_ctx(sc, slot);
@@ -1925,6 +1930,23 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, ui
/* get next trb work item */
if (XHCI_EPCTX_0_MAXP_STREAMS_GET(ep_ctx->dwEpCtx0) != 0) {
+ struct xhci_stream_ctx *sctx;
+
+ /*
+ * Stream IDs of 0, 65535 (any stream), and 65534
+ * (prime) are invalid.
+ */
+ if (streamid == 0 || streamid == 65534 || streamid == 65535) {
+ DPRINTF(("pci_xhci: invalid stream %u\r\n", streamid));
+ return;
+ }
+
+ sctx = NULL;
+ pci_xhci_find_stream(sc, ep_ctx, streamid, &sctx);
+ if (sctx == NULL) {
+ DPRINTF(("pci_xhci: invalid stream %u\r\n", streamid));
+ return;
+ }
sctx_tr = &devep->ep_sctx_trbs[streamid];
ringaddr = sctx_tr->ringaddr;
ccs = sctx_tr->ccs;
@@ -1933,6 +1955,10 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, ui
streamid, ep_ctx->qwEpCtx2 & XHCI_TRB_3_CYCLE_BIT,
trb->dwTrb3 & XHCI_TRB_3_CYCLE_BIT));
} else {
+ if (streamid != 0) {
+ DPRINTF(("pci_xhci: invalid stream %u\r\n", streamid));
+ return;
+ }
ringaddr = devep->ep_ringaddr;
ccs = devep->ep_ccs;
trb = devep->ep_tr;
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