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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. John Regehr‏ @johnregehr 19 Sep 2019
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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

      6 replies 18 retweets 77 likes
    2. Gok‏ @Gok 19 Sep 2019
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      Replying to @johnregehr

      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.

      3 replies 0 retweets 3 likes
    3. Rich Felker‏ @RichFelker 19 Sep 2019
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      Replying to @Gok @johnregehr

      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.

      3 replies 0 retweets 4 likes
    4. Shawn Walker-Salas‏ @binarycrusader 19 Sep 2019
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      Replying to @RichFelker @Gok @johnregehr

      Yes @lazytyped worked on this for sparc. It really is worth it.

      1 reply 0 retweets 2 likes
    5. Rich Felker‏ @RichFelker 19 Sep 2019
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      Replying to @binarycrusader @Gok and

      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.

      2 replies 0 retweets 1 like
    6. Gok‏ @Gok 19 Sep 2019
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      Replying to @RichFelker @binarycrusader and

      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.

      3 replies 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker 19 Sep 2019
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      Replying to @Gok @binarycrusader and

      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.

      1 reply 0 retweets 0 likes
    8. Gok‏ @Gok 19 Sep 2019
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      Replying to @RichFelker @binarycrusader and

      Heap grooming to setup overflows that span non-adjacent allocations isn’t that wild.

      2 replies 0 retweets 0 likes
    9. Patrick Walton‏ @pcwalton 19 Sep 2019
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      Replying to @Gok @RichFelker and

      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.

      2 replies 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 19 Sep 2019
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      Replying to @pcwalton @Gok and

      A lot of the security of MTE rests on pointer values remaining secret. We’ve seen how difficult this is with ASLR. At least with MTE an attacker generally needs more than one pointer value, though.

      9:07 PM - 19 Sep 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 19 Sep 2019
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          Replying to @pcwalton @Gok and

          I disagree. The cases it provides guaranteed protection against work just as well if pointer values are public knowledge. Only the non-guaranteed/stochastic cases are weakened by attacker having knowledge of pointer values.

          1 reply 0 retweets 0 likes
        3. Patrick Walton‏ @pcwalton 19 Sep 2019
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          Replying to @RichFelker @Gok and

          Sure. I was using “security” to mean everything MTE can defend against, whether guaranteed or not. (Particularly UAF.)

          1 reply 0 retweets 0 likes
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