Re: make PROT_WRITE imply PROT_READ

[Arjan van de Ven]

> 
> hi,
> 
> So if i create a PROT_WRITE only mapping and then read from first and then 
> writte to it a get a SEGV. However, if i write to it first and then read 
> from it, i don't get a SEGV...Why should the read/write ordering matter? 

it matters only on those cpus that don't have explicit/separate read
permissions (just like PROT_EXEC is implied on cpus that don't have a
special permission bit for that)...



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