use secure_malloc get large memory from __uvisor_public_sram region，is it secure？

[gylalahuo]

From the document，I find the SRAM is divided into two regin，In my application，I need
dynamically allocate large memory.and the heap size belongs secure BOX is not enough.
so I need get memory from " __uvisor_public_sram"
and store some data .

Is the data safe？

[ciarmcom]

ARM Internal Ref: IOTSEC-594