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    arm64: Implement thread_struct whitelist for hardened usercopy · 9e8084d3
    Kees Cook authored
    
    
    While ARM64 carries FPU state in the thread structure that is saved and
    restored during signal handling, it doesn't need to declare a usercopy
    whitelist, since existing accessors are all either using a bounce buffer
    (for which whitelisting isn't checking the slab), are statically sized
    (which will bypass the hardened usercopy check), or both.
    
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: Christian Borntraeger <borntraeger@de.ibm.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: James Morse <james.morse@arm.com>
    Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
    Cc: Dave Martin <Dave.Martin@arm.com>
    Cc: zijun_hu <zijun_hu@htc.com>
    Cc: linux-arm-kernel@lists.infradead.org
    Signed-off-by: default avatarKees Cook <keescook@chromium.org>
    9e8084d3