On Wed, Jun 20, 2018 at 5:24 PM, Andrey Konovalov andreyknvl@google.com wrote:
arm64 has a feature called Top Byte Ignore, which allows to embed pointer tags into the top byte of each pointer. Userspace programs (such as HWASan, a memory debugging tool [1]) might use this feature and pass tagged user pointers to the kernel through syscalls or other interfaces.
This patch makes a few of the kernel interfaces accept tagged user pointers. The kernel is already able to handle user faults with tagged pointers and has the untagged_addr macro, which this patchset reuses.
We're not trying to cover all possible ways the kernel accepts user pointers in one patchset, so this one should be considered as a start.
Thanks!
[1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
Hi!
Is there anything I should do to move forward with this?
I've received zero replies to this patch set (v3 and v4) over the last month.
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