MAP_STACK fixes #2285
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MAP_STACK fixes #2285
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If we're trying to install a stack within a reservation (uncommon and likely not sensible), we need to use the reservation's address not the address of the bottom of the stack. Fixes: #2252
Put backslashes in the 73nd column not 81st.
bsdjhb
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Use typeof() to make CHERIBSDTEST_CHECK_CALL_ERROR compatible with functions that return pointers (e.g., mmap()). Print unexpected return values with %#p to support most integer values.
It doesn't make sense to insert a stack into a reservation so disallow MAP_FIXED|MAP_STACK with a valid capability in addr. It's still allowed to MAP_FIXED|MAP_STACK, but only if there's nothing in that location (and you shouldn't be doing that).
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Fix the underlying issue in #2252 (failed vm_map_stack_lock due to write reservations) and then forbid the MAP_STACK within an existing reservation since it's not done anywhere and doesn't make much sense.