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| author | James Morse <[email protected]> | 2016-02-05 14:58:48 +0000 |
|---|---|---|
| committer | Catalin Marinas <[email protected]> | 2016-02-18 17:27:04 +0000 |
| commit | 57f4959bad0a154aeca125b7d38d1d9471a12422 (patch) | |
| tree | 6d75f86840bb0bd2d3f4928993f696c44e2033c0 /scripts/gcc-plugins/randomize_layout_plugin.c | |
| parent | 406e308770a92bd33995b2e5b681e86358328bb0 (diff) | |
arm64: kernel: Add support for User Access Override
'User Access Override' is a new ARMv8.2 feature which allows the
unprivileged load and store instructions to be overridden to behave in
the normal way.
This patch converts {get,put}_user() and friends to use ldtr*/sttr*
instructions - so that they can only access EL0 memory, then enables
UAO when fs==KERNEL_DS so that these functions can access kernel memory.
This allows user space's read/write permissions to be checked against the
page tables, instead of testing addr<USER_DS, then using the kernel's
read/write permissions.
Signed-off-by: James Morse <[email protected]>
[[email protected]: move uao_thread_switch() above dsb()]
Signed-off-by: Catalin Marinas <[email protected]>
Diffstat (limited to 'scripts/gcc-plugins/randomize_layout_plugin.c')
0 files changed, 0 insertions, 0 deletions