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| author | Pierre Pronchery <pierre@freebsdfoundation.org> | 2024-09-04 14:38:11 +0000 |
|---|---|---|
| committer | Ed Maste <emaste@FreeBSD.org> | 2024-09-04 14:59:35 +0000 |
| commit | 90af1336ed5e3c8556147325c4841c68639c4b63 (patch) | |
| tree | 260624d8598684b82ecff41ebdf7851fd98fb187 | |
| parent | 6ce4821f0859eb00e1754917e1471184755b6358 (diff) | |
| download | src-90af1336ed5e3c8556147325c4841c68639c4b63.tar.gz src-90af1336ed5e3c8556147325c4841c68639c4b63.zip | |
bhyve: fix off by one error in pci_xhci
The function pci_xhci_find_stream validates that the streamid is valid
but the bound check accepts up to ep_MaxPStreams included.
The bug results in an out-of-bounds write on the heap with controlled
data.
Reported by: Synacktiv
Reviewed by: jhb
Security: FreeBSD-SA-24:12.bhyve
Security: CVE-2024-32668
Security: HYP-04
Sponsored by: The Alpha-Omega Project
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D45994
(cherry picked from commit 5c9308a4130858598c76f3ae6e3e3dfb41ccfe68)
| -rw-r--r-- | usr.sbin/bhyve/pci_xhci.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/usr.sbin/bhyve/pci_xhci.c b/usr.sbin/bhyve/pci_xhci.c index 99c1d20b3378..791c56a45f0b 100644 --- a/usr.sbin/bhyve/pci_xhci.c +++ b/usr.sbin/bhyve/pci_xhci.c @@ -660,7 +660,7 @@ pci_xhci_init_ep(struct pci_xhci_dev_emu *dev, int epid) devep = &dev->eps[epid]; pstreams = XHCI_EPCTX_0_MAXP_STREAMS_GET(ep_ctx->dwEpCtx0); if (pstreams > 0) { - DPRINTF(("init_ep %d with pstreams %d", epid, pstreams)); + DPRINTF(("init_ep %d with pstreams %u", epid, pstreams)); assert(devep->ep_sctx_trbs == NULL); devep->ep_sctx = XHCI_GADDR(dev->xsc, ep_ctx->qwEpCtx2 & @@ -1202,7 +1202,7 @@ pci_xhci_find_stream(struct pci_xhci_softc *sc, struct xhci_endp_ctx *ep, } /* only support primary stream */ - if (streamid > devep->ep_MaxPStreams) + if (streamid >= devep->ep_MaxPStreams) return (XHCI_TRB_ERROR_STREAM_TYPE); sctx = (struct xhci_stream_ctx *)XHCI_GADDR(sc, ep->qwEpCtx2 & ~0xFUL) + |