On Tue, Sep 14, 2021 at 05:44:02PM +0800, Dan Li wrote:

__stack_chk_guard is setup once while init stage and never changed
after that.

Although the modification of this variable at runtime will usually
cause the kernel to crash (so dose the attacker), it should be marked
as _ro_after_init, and it should not affect performance if it is
placed in the ro_after_init section.

This should also be the case on the ARM platform, or am I missing
something?

I don't see why it can't be - we only write to it in
boot_init_stack_canary(), same as ARM64.

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