Topi Miettinen
7a114ed4b3
On some ARM platforms, the dynamic linker could use PROT_BTI memory protection flag with `mprotect(..., PROT_BTI | PROT_EXEC)` to enable additional memory protection for executable pages. But `MemoryDenyWriteExecute=yes` blocks this with seccomp filter denying all `mprotect(..., x | PROT_EXEC)`. Newly preferred method is to use prctl(PR_SET_MDWE) on supported kernels. Then in-kernel implementation can allow PROT_BTI as necessary, without weakening MDWE. In-kernel version may also be extended to more sophisticated protections in the future.
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