memory tagging should be a game changer for C and C++; get with the program, @intel and @apple!!pic.twitter.com/z2vXAtTb7z
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memory tagging should be a game changer for C and C++; get with the program, @intel and @apple!!pic.twitter.com/z2vXAtTb7z
I'm going to be that jerkface and predict that MTE won't do all that much. It's a pretty weak mitigation that requires a lot of work to adopt.
MTE requires relatively little work to adopt (I say this as someone who's adamant about not adopting invasive "hardening" snakeoil like CET) and completely closes off huge classes of vulns.
Yes @lazytyped worked on this for sparc. It really is worth it.
Yep. Even if folks are critical of the limits of 4 bits for UAF protection, completely eliminating all stack, heap, data/bss, and tls based buffer overflows is huge.
I still don’t really agree with that characterization. The overflow protection has the same 4-bits-ain’t-enough issue, and it only works at all for a subset of memory management strategies.
No it doesn't. You only need a single bit of tagging for overflow protection, so that no two adjacent objects have the same tag.
Heap grooming to setup overflows that span non-adjacent allocations isn’t that wild.
Yeah, I realized after typing that that it isn’t necessarily that strong. Scenario: Attacker can leak pointers and has a write primitive through pointer P plus attacker-controlled offset. Attacker just needs to find some target with tag(P). Can be easy with only 4 bits.
If offset is fully attacker-controlled and you know the tags, you can just put tag2-tag1 in the upper bits of it and target any tag you want.
Ah yes, true! (Though doesn’t MTE have an instruction to offset a pointer that doesn’t overflow into the tag? Maybe I’m misremembering.)
(No, it doesn’t seem to. I only see a subtract operation and an immediate add operation here.)https://en.wikichip.org/wiki/arm/mte
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