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Add mmap_rnd_bits routine for riscv64

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Signed-off-by: Mao Han <han_mao@linux.alibaba.com>
Change-Id: Ide793f4365fee67f30e35302365c4a7a5ba1f021
This commit is contained in:
Mao Han 2022-10-12 22:25:06 +08:00 • committed by Elliott Hughes
parent 0d77b388f5
commit c09eee098b
1 changed files with 7 additions and 0 deletions
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7
init/security.cpp
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@ -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.