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(parent: bc6f7dc) | 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)
committerYves-Alexis Perez <corsac@debian.org>
Thu, 4 Jan 2018 11:12:40 +0000 (11:12 +0000)
commit53cd7e21b8c647d718e9ce42c165d25a65edd546
tree99a8bd46535c41cacd1fb3cd80aa1a8dc5cb2d47tree | snapshot
parentbc6f7dcb69e802561854bb00d7220ba3dc066597commit | 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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