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sl is controlled by user-space, hence leading to a potential
exploitation of the Spectre variant 1 vulnerability.
Fix this by sanitizing sl before using it to index ibp->sl_to_sc.
Notice that given that speculation windows are large, the policy is
to kill the speculation on the first load and not worry if it can be
completed with a dependent load/store [1].
[1] https://lore.kernel.org/lkml/20180423164740.GY17484@dhcp22.suse.cz/
Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Link: https://lore.kernel.org/r/20190731175428.GA16736@embeddedor
Signed-off-by: Doug Ledford <dledford@redhat.com>
6497d0a9c5