sparc/uaccess: Enable hardened usercopy
Enables CONFIG_HARDENED_USERCOPY checks on sparc. Based on code from PaX and grsecurity. Signed-off-by:Kees Cook <keescook@chromium.org> (cherry picked from commit 9d9208a15800f9f06f102f9aac1e8b323c3b8575) Signed-off-by:
Alex Shi <alex.shi@linaro.org>
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