path: root/COPYING
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authorJames Morse <james.morse@arm.com>2015-07-22 19:05:54 +0100
committerDavid Brown <david.brown@linaro.org>2015-12-03 16:53:53 -0800
commit20af540051e1c1f7a7d9b9e4613c1ecc53ded4a6 (patch)
tree0c02d4d7b3de8239ac87cb0d01cfe51cc0263b4b /COPYING
parente7aa2ecf27faab420d6dd3b173419f6fd7bf85be (diff)
arm64: kernel: Add support for Privileged Access Neverv3.18/topic/PAN
commit 338d4f49d6f7114a017d294ccf7374df4f998edc upstream. 'Privileged Access Never' is a new arm8.1 feature which prevents privileged code from accessing any virtual address where read or write access is also permitted at EL0. This patch enables the PAN feature on all CPUs, and modifies {get,put}_user helpers temporarily to permit access. This will catch kernel bugs where user memory is accessed directly. 'Unprivileged loads and stores' using ldtrb et al are unaffected by PAN. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: James Morse <james.morse@arm.com> [will: use ALTERNATIVE in asm and tidy up pan_enable check] Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: David Brown <david.brown@linaro.org>
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