Hi Jeff, On 08/01, Jeff Xu wrote: > > __create_xol_area() calls _install_special_mapping() to create a vma > named [uprobes]. > > I'm trying to find out the lifetime of this uprobes vma, e.g. when it > is created, will it ever be unmapped/remapped/changed during the > lifetime of the process. > > If the uprobes vma remains the same during the lifetime of the > process, Yes, > I can call mseal on it so user space can't change it, i.e. > blocking munmap/mremap/mprotect/mmap, etc. I didn't even know about mm/mseal.c... at first glance do_mseal() just adds VM_SEALED for can_modify_vma(). So it seems that xol_add_vma() can just pass the additional VM_SEALED flag to _install_special_mapping(), no? But why it depends on CONFIG_64_BIT? Oleg.
