Date: Wed, 17 Aug 2022 17:02:21 GMT From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: e7439f6aeb23 - main - bhyve xhci: Cache the value of MaxPStreams when initializing an endpoint. Message-ID: <202208171702.27HH2Ljh055767@gitrepo.freebsd.org>
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The branch main has been updated by jhb: URL: https://cgit.FreeBSD.org/src/commit/?id=e7439f6aeb235ba3a7e79818c56a63d066c80854 commit e7439f6aeb235ba3a7e79818c56a63d066c80854 Author: John Baldwin <jhb@FreeBSD.org> AuthorDate: 2022-08-17 17:00:36 +0000 Commit: John Baldwin <jhb@FreeBSD.org> CommitDate: 2022-08-17 17:00:36 +0000 bhyve xhci: Cache the value of MaxPStreams when initializing an endpoint. This avoids type confusion where a malicious guest could rewrite the MaxPStreams field in an endpoint context after the endpoint was initialized causing the device model to interpret a guest provided address (stored in ep_ringaddr of the "software" endpoint state) as a bhyve host process address (ep_sctx_trbs). It also prevents a malicious guest from triggering overflows of ep_sctx_trbs[] by increasing the number of streams after the endpoint has been initialized. Rather than re-reading the MaxPStreams value out of the endpoint context in guest memory on subsequent operations, cache the value in the software endpoint state. Possibly the device model should raise errors if the value of MaxPStreams changes while an endpoint is running. This approach simply ignores any such changes by the guest. PR: 264294, 264347 Reported by: Robert Morris <rtm@lcs.mit.edu> Reviewed by: markj MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D36181 --- usr.sbin/bhyve/pci_xhci.c | 37 ++++++++++++++++++++++--------------- 1 file changed, 22 insertions(+), 15 deletions(-) diff --git a/usr.sbin/bhyve/pci_xhci.c b/usr.sbin/bhyve/pci_xhci.c index 02a9b8f0b356..bea5095784a3 100644 --- a/usr.sbin/bhyve/pci_xhci.c +++ b/usr.sbin/bhyve/pci_xhci.c @@ -170,6 +170,13 @@ struct pci_xhci_dev_ep { #define ep_tr _ep_trbsctx._epu_tr #define ep_sctx _ep_trbsctx._epu_sctx + /* + * Caches the value of MaxPStreams from the endpoint context + * when an endpoint is initialized and is used to validate the + * use of ep_ringaddr vs ep_sctx_trbs[] as well as the length + * of ep_sctx_trbs[]. + */ + uint32_t ep_MaxPStreams; union { struct pci_xhci_trb_ring _epu_trb; struct pci_xhci_trb_ring *_epu_sctx_trbs; @@ -673,6 +680,7 @@ pci_xhci_init_ep(struct pci_xhci_dev_emu *dev, int epid) devep->ep_tr = XHCI_GADDR(dev->xsc, devep->ep_ringaddr); DPRINTF(("init_ep tr DCS %x", devep->ep_ccs)); } + devep->ep_MaxPStreams = pstreams; if (devep->ep_xfer == NULL) { devep->ep_xfer = malloc(sizeof(struct usb_data_xfer)); @@ -694,9 +702,8 @@ pci_xhci_disable_ep(struct pci_xhci_dev_emu *dev, int epid) ep_ctx->dwEpCtx0 = (ep_ctx->dwEpCtx0 & ~0x7) | XHCI_ST_EPCTX_DISABLED; devep = &dev->eps[epid]; - if (XHCI_EPCTX_0_MAXP_STREAMS_GET(ep_ctx->dwEpCtx0) > 0 && - devep->ep_sctx_trbs != NULL) - free(devep->ep_sctx_trbs); + if (devep->ep_MaxPStreams > 0) + free(devep->ep_sctx_trbs); if (devep->ep_xfer != NULL) { free(devep->ep_xfer); @@ -1156,7 +1163,7 @@ pci_xhci_cmd_reset_ep(struct pci_xhci_softc *sc, uint32_t slot, ep_ctx->dwEpCtx0 = (ep_ctx->dwEpCtx0 & ~0x7) | XHCI_ST_EPCTX_STOPPED; - if (XHCI_EPCTX_0_MAXP_STREAMS_GET(ep_ctx->dwEpCtx0) == 0) + if (devep->ep_MaxPStreams == 0) ep_ctx->qwEpCtx2 = devep->ep_ringaddr | devep->ep_ccs; DPRINTF(("pci_xhci: reset ep[%u] %08x %08x %016lx %08x", @@ -1177,16 +1184,15 @@ done: static uint32_t pci_xhci_find_stream(struct pci_xhci_softc *sc, struct xhci_endp_ctx *ep, - uint32_t streamid, struct xhci_stream_ctx **osctx) + struct pci_xhci_dev_ep *devep, uint32_t streamid, + struct xhci_stream_ctx **osctx) { struct xhci_stream_ctx *sctx; - uint32_t maxpstreams; - maxpstreams = XHCI_EPCTX_0_MAXP_STREAMS_GET(ep->dwEpCtx0); - if (maxpstreams == 0) + if (devep->ep_MaxPStreams == 0) return (XHCI_TRB_ERROR_TRB); - if (maxpstreams > XHCI_STREAMS_MAX) + if (devep->ep_MaxPStreams > XHCI_STREAMS_MAX) return (XHCI_TRB_ERROR_INVALID_SID); if (XHCI_EPCTX_0_LSA_GET(ep->dwEpCtx0) == 0) { @@ -1195,7 +1201,7 @@ pci_xhci_find_stream(struct pci_xhci_softc *sc, struct xhci_endp_ctx *ep, } /* only support primary stream */ - if (streamid > maxpstreams) + if (streamid > devep->ep_MaxPStreams) return (XHCI_TRB_ERROR_STREAM_TYPE); sctx = XHCI_GADDR(sc, ep->qwEpCtx2 & ~0xFUL) + streamid; @@ -1257,11 +1263,12 @@ pci_xhci_cmd_set_tr(struct pci_xhci_softc *sc, uint32_t slot, } streamid = XHCI_TRB_2_STREAM_GET(trb->dwTrb2); - if (XHCI_EPCTX_0_MAXP_STREAMS_GET(ep_ctx->dwEpCtx0) > 0) { + if (devep->ep_MaxPStreams > 0) { struct xhci_stream_ctx *sctx; sctx = NULL; - cmderr = pci_xhci_find_stream(sc, ep_ctx, streamid, &sctx); + cmderr = pci_xhci_find_stream(sc, ep_ctx, devep, streamid, + &sctx); if (sctx != NULL) { assert(devep->ep_sctx != NULL); @@ -1631,7 +1638,7 @@ pci_xhci_update_ep_ring(struct pci_xhci_softc *sc, struct pci_xhci_dev_emu *dev, uint32_t streamid, uint64_t ringaddr, int ccs) { - if (XHCI_EPCTX_0_MAXP_STREAMS_GET(ep_ctx->dwEpCtx0) != 0) { + if (devep->ep_MaxPStreams != 0) { devep->ep_sctx[streamid].qwSctx0 = (ringaddr & ~0xFUL) | (ccs & 0x1); @@ -1942,7 +1949,7 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, uint32_t slot, } /* get next trb work item */ - if (XHCI_EPCTX_0_MAXP_STREAMS_GET(ep_ctx->dwEpCtx0) != 0) { + if (devep->ep_MaxPStreams != 0) { struct xhci_stream_ctx *sctx; /* @@ -1955,7 +1962,7 @@ pci_xhci_device_doorbell(struct pci_xhci_softc *sc, uint32_t slot, } sctx = NULL; - pci_xhci_find_stream(sc, ep_ctx, streamid, &sctx); + pci_xhci_find_stream(sc, ep_ctx, devep, streamid, &sctx); if (sctx == NULL) { DPRINTF(("pci_xhci: invalid stream %u", streamid)); return;
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