On Wed, Aug 9, 2017 at 10:07 AM, Kees Cook via binutils <binut...@sourceware.org> wrote: > Hi, > > I'd like to be able to mark an ELF binary in such a way that Linux's > binfmt_elf.c will collapse a PIE text area into the mmap region > (currently they are separately randomized in memory). This is desired > by AddressSanitizer to avoid having an ASan-built binary have its text > area moving into an unexpected location[1] (ASLR is still desired, but > doesn't need to have a PIE/mmap split). > > I see a few ways: > > - Add parsing for NOTE program headers and add a new NOTE type > (NT_GNU_EXEC_FLAGS), though notes tend to be strings... > > - Add a new Program Header (GNU_EXEC_FLAGS), which is similar to how > GNU_STACK and GNU_RELRO were handled. This could sort of be like NOTE > except just lots of bit flags. > > - Use a filesystem xattr. This is fragile, in the case of copying > binaries between systems or filesystems. > > Thoughts? > >
Why don't you use NT_GNU_PROPERTY_TYPE_0? -- H.J.
