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| author | Dan Williams <dan.j.williams@intel.com> | 2018-03-08 18:39:24 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-11 16:21:34 +0100 |
| commit | 93f3aff1d910c5363a42c2c18dec9939cb0d58c2 (patch) | |
| tree | 23ad162a5b5474d79e675955d9ea4132d9ab2568 /kernel/bpf/stackmap.c | |
| parent | d77763dc70c4afa451b33f80013910d502bf3bb7 (diff) | |
mpls, nospec: Sanitize array index in mpls_label_ok()
commit 3968523f855050b8195134da951b87c20bd66130 upstream.
mpls_label_ok() validates that the 'platform_label' array index from a
userspace netlink message payload is valid. Under speculation the
mpls_label_ok() result may not resolve in the CPU pipeline until after
the index is used to access an array element. Sanitize the index to zero
to prevent userspace-controlled arbitrary out-of-bounds speculation, a
precursor for a speculative execution side channel vulnerability.
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 4.4:
- mpls_label_ok() doesn't take an extack parameter
- Drop change in mpls_getroute()]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/bpf/stackmap.c')
0 files changed, 0 insertions, 0 deletions