On Wed, Sep 29, 2021 at 11:54:55AM -0700, Kees Cook wrote: > On Mon, Sep 27, 2021 at 01:50:56PM -0700, Josh Poimboeuf wrote: > > Even with that patch, it doesn't lock the task's runqueue before reading > > the stack, so there's still the possibility of the task running on > > another CPU and the unwinder going off the rails a bit, which might be > > used by an attacker in creative ways similar to the /proc/<pid>/stack > > vulnerability Jann mentioned earlier. > Since I think we're considering get_wchan() to be slow-path, can we just > lock the runqueue and use arch_stack_walk_reliable()? Unfortunately arch_stack_walk_reliable() is only available for powerpc, s390 and x86 currently - work is in progress to implement it for arm64 as well but it's not there yet.
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