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It is bull, its up to the OS to set up the MMU so zero page to be protected against writes (and reads if necessary), just as it is for any processor to set protection on certain critical pages containing jump tables.

Later versions of RISC OS protect against user mode writes to zero page but not SVC mode, which is should really do as only OS_ClaimProcessorVector has a legitimate reason to write there (if we can ignore the legacy FIQ handlers which were poked in at the last vector entry). While we are at it, OS_File should be doing a bit of argument validation, as it still crashes Select (on VRPC) - where are all those improvements?

 is a RISC OS Userdruck on 25/4/07 9:16AM
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