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Commit b87b2555 authored by Sami Tolvanen's avatar Sami Tolvanen
Browse files

riscv64: increase ASLR randomness for Sv48/57 

Linux 6.9+ supports 33 bits with Sv48 and Sv57. Increase the
maximum and update the comment.

Bug: https://github.com/google/android-riscv64/issues/1
Test: Treehugger
Change-Id: Ia2731143ad30c5febe2058d35a381c01b14d8c3c
parent edbddd30

init/security.cpp

+3 −4
Original line number Diff line number Diff line
@@ -114,10 +114,9 @@ Result<void> SetMmapRndBitsAction(const BuiltinArguments&) { 
        return {};

    }

#elif defined(__riscv)

    // TODO: sv48 and sv57 have both been added to the kernel, but the kernel

    // still doesn't support more than 24 bits.

    // https://github.com/google/android-riscv64/issues/1

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

    // riscv64 supports 24 rnd bits with Sv39, and starting with the 6.9 kernel,

    // 33 bits with Sv48 and Sv57.

    if (SetMmapRndBitsMin(33, 24, false)) {

        return {};

    }

#elif defined(__x86_64__)