On Thu, Apr 2, 2020 at 7:26 PM Kees Cook <keescook@xxxxxxxxxxxx> wrote: > > On Thu, Apr 02, 2020 at 06:20:57PM +0200, Sedat Dilek wrote: > > On Fri, Feb 28, 2020 at 1:22 AM Kees Cook <keescook@xxxxxxxxxxxx> wrote: > > > > > > Hi! > > > > > > A recent bug was solved for builds linked with ld.lld, and tracking > > > it down took way longer than it needed to (a year). Ultimately, it > > > boiled down to differences between ld.bfd and ld.lld's handling of > > > orphan sections. Similarly, the recent FGKASLR series brough up orphan > > > section handling too[2]. In both cases, it would have been nice if the > > > linker was running with --orphan-handling=warn so that surprise sections > > > wouldn't silently get mapped into the kernel image at locations up to > > > the whim of the linker's orphan handling logic. Instead, all desired > > > sections should be explicitly identified in the linker script (to be > > > either kept or discarded) with any orphans throwing a warning. The > > > powerpc architecture actually already does this, so this series seeks > > > to extend this coverage to x86, arm64, and arm. > > > > > > This series depends on tip/x86/boot (where recent .eh_frame fixes[3] > > > landed), and has a minor conflict[4] with the ARM tree (related to > > > the earlier mentioned bug). As it uses refactorings in the asm-generic > > > linker script, and makes changes to kbuild, I think the cleanest place > > > for this series to land would also be through -tip. Once again (like > > > my READ_IMPLIES_EXEC series), I'm looking to get maintainer Acks so > > > this can go all together with the least disruption. Splitting it up by > > > architecture seems needlessly difficult. > > > > > > Thanks! > > > > > > > Hi Kees, > > > > what is the status of this patchset? > > Looks like it is not in tip or linux-next Git. > > Based on the feedback, I have 3 TODO items: > > - track down and eliminate (or explain) the source of the .got.plt on arm64 > - enable orphan warnings for _all_ architectures > - refactor final link logic to perform the orphan warning in a clean way > > I'm working through these (and other work) still. I'm hoping to have > another version up some time next week. > Please CC when possible with a pointer to a git-link. Thanks. - sed@ -
