morello README update

diff --git a/manual/README.morello b/manual/README.morello
index 8a2be21bd469183f0b720896590ce7761f222669..2db20724ba54548d536bbd651960eec9319c24bb 100644 (file)
--- a/manual/README.morello
+++ b/manual/README.morello
@@ -29,7 +29,9 @@ Limitations of the morello port:
 - POSIX message queue async notify does not work (pointers passed via an fd).
 - Process shared robust mutexes don't work (pointers in shared memory).
 - Purecap pldd only supports purecap ABI processes (not lp64).
-- malloc has significant overhead (locks and hash table lookup).
+- malloc bounds narrowing has large overhead (locks and hash table lookup).
+- malloc bounds narrowing can break code expecting page granularity protection.
+       Use GLIBC_TUNABLES=glibc.mem.cap_narrowing=0 env var as a workaround.
 - string functions are not optimized.
-- Exectable stacks are not supported.
+- Executable stacks are not supported.
 - Internal pointer protection and pointer mangling are disabled.