Messages in this thread | | | Date | Mon, 12 Aug 2013 21:51:59 -0700 | From | Laura Abbott <> | Subject | Re: [ARM ATTEND] catching up on exploit mitigations |
| |
On 7/30/2013 12:05 PM, Kees Cook wrote: > I'd like to propose the topic of catching up to x86 exploit > mitigations and security features, and potentially identifying > ARM-unique mitigations/features that could be implemented. Several > years ago, with Nicolas Pitre doing all the real work, I coordinated > getting ARM caught up on things like userspace ASLR and > stack-protector. Recently, based on work by Will Drewry, I ported > seccomp-bpf to ARM. I'd like to continue this kind of thing, and I > think it's overdue to examine this area again. A lot of work has > already been done by grsecurity in this area (see > http://forums.grsecurity.net/viewtopic.php?f=7&t=3292), so it would be > good to start there. > > While it may expose my current ignorance of low level ARM mechanics, > I'd like to examine and discuss: > > - RO and W^X kernel page table protections (similar to x86's > DEBUG_RODATA and DEBUG_SET_MODULE_RONX; it's not clear to me how much > LPAE and PXN is already handling this, if at all) >
We've had support for RO/NX on our tree for a while. I'm interested in attending the summit to share what we've done and to see how much of it could be mainlined.
> - something like x86's SMEP and SMAP (to deter kernel exploitation > from userspace) > > - vector table protections (needs to be protected like the x86_64 > vsyscall table, RO, etc) > > - kernel ASLR (I'm close to having this upstreamable for x86) > > - fuzzing (is anyone running trinity or similar on the ARM tree?) > > - any other things ... ?
I'd add getting something similar to CONFIG_ARCH_RANDOM for ARM. It wouldn't be a direct drop in to x86 but we have some usecases for a framework to hook into the arch_get_random_{int,long}. This is mostly useful for cases where we need random numbers before the kernel's entropy source is completely initialized. The last point is a separate discussion all together.
> > Thanks, > > -Kees >
Thanks, Laura
-- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
| |