memsz              32 kernel/elf.h     uint64 memsz;
memsz              58 kernel/exec.c      if(ph.memsz < ph.filesz)
memsz              60 kernel/exec.c      if(ph.vaddr + ph.memsz < ph.vaddr)
memsz              65 kernel/exec.c      if((sz1 = uvmalloc(pagetable, sz, ph.vaddr + ph.memsz, flags2perm(ph.flags))) == 0)