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(parent: 6cc2a13) | patch
x86: Lock down IO port access when securelevel is enabled
authorMatthew Garrett <mjg59@srcf.ucam.org>
Thu, 8 Mar 2012 15:35:59 +0000 (10:35 -0500)
committerSalvatore Bonaccorso <carnil@debian.org>
Sun, 6 Aug 2017 04:24:47 +0000 (05:24 +0100)
commit1a281bd9f0db4d7fac68c4d93c6c2a6bb68e7d92
treeef4475686b4528e7f16b4088f9c297bb56aa7c30tree | snapshot
parent6cc2a13740640992e1d6399b77812f2cbd7b1301commit | diff
x86: Lock down IO port access when securelevel is enabled

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 <mjg59@srcf.ucam.org>
Gbp-Pq: Topic features/all/securelevel
Gbp-Pq: Name x86-lock-down-io-port-access-when-securelevel-is-ena.patch
arch/x86/kernel/ioport.c diff | blob | history
drivers/char/mem.c diff | blob | history
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