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Not working with Substitute-based hooking #73

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nabla-c0d3 opened this issue Nov 19, 2019 · 0 comments

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wontfix

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nabla-c0d3 commented Nov 19, 2019 •

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The crash people are seeing is due to Substitute (the library that Chimera uses for hooking C functions) not supporting functions that are very short. I think if there's less than ~60 bytes of stack space available after the function prologue, Substitute will cause a crash.

Alternatives:

Wait for Chimera to switch to a better hooking solution.

Make Chimera use the hacky version of MobileSubstrate that unc0ver uses.

Use an in-house function interposing technique that supports short functions. This technique works on functions as long as they're 5+ bytes: https://github.com/thomasfinch/CRuntimeFunctionHooker/blob/master/inject.c#L52

Originally posted by @EthanArbuckle in #63 (comment)

nabla-c0d3 added the wontfix label

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