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authorJonathan Austin <Jonathan.Austin@arm.com>2012-04-12 17:45:25 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-04-15 22:00:31 +0100
commit078c04545ba56da21567728a909a496df5ff730d (patch)
tree08d0f061a972f426ef7d7c2ae227ac998ffca013 /arch/arm/mach-h720x
parente5ab85800820edd907d3f43f285e1232f84d5a41 (diff)
ARM: 7384/1: ThumbEE: Disable userspace TEEHBR access for !CONFIG_ARM_THUMBEE
Currently when ThumbEE is not enabled (!CONFIG_ARM_THUMBEE) the ThumbEE register states are not saved/restored at context switch. The default state of the ThumbEE Ctrl register (TEECR) allows userspace accesses to the ThumbEE Base Handler register (TEEHBR). This can cause unexpected behaviour when people use ThumbEE on !CONFIG_ARM_THUMBEE kernels, as well as allowing covert communication - eg between userspace tasks running inside chroot jails. This patch sets up TEECR in order to prevent user-space access to TEEHBR when !CONFIG_ARM_THUMBEE. In this case, tasks are sent SIGILL if they try to access TEEHBR. Cc: stable@vger.kernel.org Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Jonathan Austin <jonathan.austin@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-h720x')
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