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Now, I am trying to figure out the differences or similarities between Scudo and other secure allocators, like 's malloc ( ) or 's malloc or Guarder (usenix.org/system/files/c)
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After reading the series of nice tweets from (twitter.com/ebeip90/status), I understood some things but still learning and still have to read the source code of the above mentioned secure allocators.
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Here, I am just trying to summarize the differences (compare to Scudo), please correct me, if I misunderstood:
1. Scudo can't reliably detect invalid free.
2. It lacks fine grained randomization.
Is there any differences if we try to compare all 3 above mentioned allocators?🤔
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The comparison in that paper is very incomplete and misleading. It oversimplifies a lot of the differences and boils down complex things to a single point, which is wrong. It's not where you should your information about this. hardened_malloc is also not OpenBSD malloc.
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All I can do is strongly suggest reading through github.com/GrapheneOS/har, testing it out (github.com/GrapheneOS/har shows the baseline size class partitioning and there are tests demonstrating some other things in github.com/GrapheneOS/har) and looking at the implementation.
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Please don't try making a comparison like this before doing the research:
twitter.com/_neerajpal/sta
Someone else at Mozilla recently did the same and attacked it as nearly completely useless and easily replicated elsewhere based on false claims, and I don't appreciate it at all.
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Here, I am just trying to summarize the differences (compare to Scudo), please correct me, if I misunderstood:
1. Scudo can't reliably detect invalid free.
2. It lacks fine grained randomization.
Is there any differences if we try to compare all 3 above mentioned allocators?
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Yeah sure. Actually, I was reading your series of tweets on Hardened_malloc and scudo discussion, so, just for confirmation point of view I made this two points and asked.
But thanks and sure from on next time I'll keep that in mind. 🙂