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Commit c09eee09 authored by Mao Han's avatar Mao Han Committed by Elliott Hughes
Browse files

Add mmap_rnd_bits routine for riscv64 



Signed-off-by: default avatarMao Han <han_mao@linux.alibaba.com>
Change-Id: Ide793f4365fee67f30e35302365c4a7a5ba1f021
parent 0d77b388

init/security.cpp

+7 −0
Original line number Diff line number Diff line
@@ -116,6 +116,13 @@ Result<void> SetMmapRndBitsAction(const BuiltinArguments&) { 
    if (SetMmapRndBitsMin(33, 24, false) && (!Has32BitAbi() || SetMmapRndBitsMin(16, 16, true))) {

        return {};

    }

#elif defined(__riscv)

    // TODO: sv48 and sv57 were both added to the kernel this year, so we

    // probably just need some kernel fixes to enable higher ASLR randomization,

    // but for now 24 is the maximum that the kernel supports.

    if (SetMmapRndBitsMin(24, 18, false)) {

        return {};

    }

#elif defined(__x86_64__)

    // x86_64 supports 28 - 32 rnd bits, but Android wants to ensure that the

    // theoretical maximum of 32 bits is always supported and used.