[PATCH v23 06/28] riscv/mm : ensure PROT_WRITE leads to VM_READ | VM_WRITE

[Andreas Schwab]

On Jun 01 2026, Deepak Gupta wrote:

> riscv uses `VM_SHADOW_STACK`. It's just very simple to use `protection_map`
> with just `VM_WRITE`. On RISC-V, `-W-` is a shadow stack mapping. It's not same
> on x86 or arm64. So `protection_map[VM_WRITE]` simply picks shadow stack
> encoding. We just ensure that PROT_WRITE is converted to
> "VM_READ | VM_WRITE" at vma level.

That does not explain _why_ you need to make that user visible change,
when others can get away without it.

-- 
Andreas Schwab, schwab at linux-m68k.org
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