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? -Kees [1] https://lkml.org/lkml/2017/8/7/770 -- Kees Cook Pixel Security -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
