Description
A time-of-check to time-of-use (TOCTOU) flaw in the illumos data-link pseudo-driver (dld) affects handling of the DLDIOC_GETMACPROP and DLDIOC_SETMACPROP ioctls on /dev/dld. drv_ioc_prop_common() in usr/src/uts/common/io/dld/dld_drv.c copies the dld_ioc_macprop_t ioctl header in once to read its pr_valsize field, sizes and allocates a kernel heap buffer from that value, and then copies the full request in a second time from the same unprivileged user address. A concurrent thread can enlarge pr_valsize between the two copyins, so the second copyin and the subsequent property handling write beyond the end of the undersized allocation and corrupt the kernel heap. An unprivileged local user, including one confined to a non-global zone that owns a datalink, can trigger this to panic the system. The resulting kernel heap corruption may be usable for further compromise.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
illumos illumos-gate
Default version status: affected
eae72b5b807baa9116e64502cbb278edf15f3146 to < 6959feb5b430411a4809b06c53dcdb42fb525eacaffected
OmniOS OmniOS
Default version status: affected
any to < r151054affectedr151058 to < r151058jaffectedr151056 to < r151056ajaffectedr151054 to < r151054bjaffected
Triton Data Center SmartOS
Default version status: affected
any to < 202060709affected