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x86: Lock down IO port access when securelevel is enabled
authorMatthew Garrett <matthew.garrett@nebula.com>
Mon, 9 Sep 2013 22:49:38 +0000 (15:49 -0700)
committerSantosh Shilimkar <santosh.shilimkar@oracle.com>
Mon, 10 Aug 2015 16:24:05 +0000 (09:24 -0700)
commitd6ff7b26e9867e2984a3ff2ed73706fa27ca4843
tree055fa61bbb0b76488ead9ccc88317e335eada1c9tree
parentf0eee24a0be0d54000cb86451fa8e60a12ce595fcommit | diff
x86: Lock down IO port access when securelevel is enabled

Orabug: 21539498

IO port access would permit users to gain access to PCI configuration
registers, which in turn (on a lot of hardware) give access to MMIO register
space. This would potentially permit root to trigger arbitrary DMA, so lock
it down when securelevel is set.

Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
arch/x86/kernel/ioport.c diff | blob | history
drivers/char/mem.c diff | blob | history
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