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authorJonathan Austin <Jonathan.Austin@arm.com>2012-04-12 17:45:25 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-22 16:21:22 -0700
commitc30d6d63c156d6842a6f895493766077773bbf87 (patch)
tree8385d11a54722c1c0dd3204fa3c1703cdd180323 /sound
parent2586dcec57d8334c5c2f313d840d27148de4e9a3 (diff)
ARM: 7384/1: ThumbEE: Disable userspace TEEHBR access for !CONFIG_ARM_THUMBEE
commit 078c04545ba56da21567728a909a496df5ff730d upstream. 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. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound')
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