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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

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    1. Tavis Ormandy‏Verified account @taviso 2 Nov 2019
      • Report Tweet
      • Report NetzDG Violation

      Is there a secret to making vbtables look good in Hex-Rays? This is the best I can come up with, and an example decompiled call. I can just about read it (call second vftable entry on SubClass1, __thiscall with one param), but is there a cleaner way?pic.twitter.com/G64QyU5VA7

      8 replies 7 retweets 78 likes
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    2. Josh Watson‏ @josh_watson 2 Nov 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso

      Yes. Step 1: Highlight the entire vtable in linear view and right click. Select "create struct" or "make struct" or whatever it's called

      1 reply 0 retweets 5 likes
    3. Josh Watson‏ @josh_watson 2 Nov 2019
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      Replying to @josh_watson @taviso

      Step 2: Rename the resulting struct type "MyClass_vtbl"

      1 reply 0 retweets 0 likes
    4. Josh Watson‏ @josh_watson 2 Nov 2019
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      Replying to @josh_watson @taviso

      Step 3: Create your class struct in Local Types. struct __cppobj MyClass { MyClass_vtbl* __vftable; int foo; int bar; };

      1 reply 0 retweets 0 likes
    5. Josh Watson‏ @josh_watson 2 Nov 2019
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      Replying to @josh_watson @taviso

      Step 4: If you have inheritance, you can do that too! struct __cppobj MyChildClass : MyClass { }; and now when you define a struct for MyChildClass_vtbl, it will automatically use that one for MyChildClass instead

      1 reply 0 retweets 1 like
    6. Josh Watson‏ @josh_watson 2 Nov 2019
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      Replying to @josh_watson @taviso

      By using the "create struct" feature, especially on stuff with symbols, it'll automatically define the function types of all the virtual methods, and by naming the vtable __vftable, you'll see this->AddRef(this) instead of this->__vftable->AddRef(this), for example

      1 reply 0 retweets 0 likes
    7. Josh Watson‏ @josh_watson 2 Nov 2019
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      Replying to @josh_watson @taviso

      Oh, and finally, if it's casting the method because the types don't perfectly match up (like it thinks it's __fastcall instead of __thiscall or something), you can right click on the method name and select "Force Type" and it will force it to be the defined method type

      1 reply 0 retweets 0 likes
    8. Josh Watson‏ @josh_watson 2 Nov 2019
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      Replying to @josh_watson @taviso

      And now that I look this over again, I realize that you're asking about v*b*tables, not v*f*tables lol

      2 replies 0 retweets 2 likes
    9. Tavis Ormandy‏Verified account @taviso 2 Nov 2019
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      Replying to @josh_watson

      Ah, right, damn, I got excited that the it might clean it up nicely if I declared the inheritance correctly!

      1 reply 0 retweets 0 likes
    10. Josh Watson‏ @josh_watson 2 Nov 2019
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      Replying to @taviso

      Multiple inheritance does work, but I don’t think it works correctly with these. Honestly I’ve never ever seen a vbtable before hahaha

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 2 Nov 2019
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      Replying to @josh_watson

      I just tried it and no matter how I declare it, I can't get it to work, I think my union trick is the best I'm going to get haha. I can live with it, it just seems so close! 😣

      9:26 AM - 2 Nov 2019
      0 replies 0 retweets 0 likes

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