Comments (5)
I don't know that either. But after this pull request is merged, we will ship to the latest version of fishhook. But currently, we iterate all the images loaded by dyld and use regex to get the specific images by name. Ultimately use rebind_symbol_images method to solve this problem temporarily.
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Update: Crash on iPad 2 Simulator which is 32 bits. And works fine on other 64 bits simulator.
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It seems like when using fishhook to rebind symbols in all images on 32-bits simulator finally bind connect function to libsystem_sim_kernel.lib
. And when using 64-bits finally bind to libsystem_kernel.dylib
and the function imp of connect
in libsystem_sim_kernel.lib
may don't related to networking.
So when new_connect is being called, it doesn't return the correct result to the upper layer. This may lead to infinite looping problem.
I fixed this problem by using rebind_symbols_image
function to change specific function imp in libsystem_network.dylib
. Questions seem to be solved.
Only puzzle remains now, does the connect
function in libsystem_kernel.dylib
has the same function as which in libsystem_network.dylib
, when using 64-bits simulator with rebind_symbols
. Fishhook rebinds all the symbols in images and coincidently bind function in libsystem_kernel.dylib
to our origianl_connect
function pointer which has the same implementation. So all the code works fine?
I don't quite believe in fortune or coincidence. But really thanks feeding some info on this lib's usage.
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The solution here may be to support for mach-o's two-level namespaces. When rebinding a symbol, fishhook should first check to see if that symbol refers to a specific library. If there is a specific library, fishhook should not rebind symbols of the same name that are bound to other libraries.
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I don't know if helps the problem you're hitting, but I put up a pull request (#34) to support two-level namespaces. If there are multiple functions named connect
as you suggest, then the new code would allow the rebinding of only symbols from a specified library.
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Related Issues (20)
- Hook should call the original method before HOT 1
- fishhook crash on iOS 13.0 beta HOT 1
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- Why is there no integration in my project, but running the program will automatically generate Github/fishhookDemo/...
- iOS13 Thread 1: EXC_BAD_ACCESS (code=2, address=0x1287b4390) HOT 3
- Thread 1: EXC_BAD_ACCESS HOT 5
- Why I don't bind CFReadStreamCreateForHTTPRequest, HOT 1
- build fail when __LP64__ is not defined HOT 2
- iOS 13Crash HOT 7
- Hook called in iOS simulator but not called on-device HOT 2
- How thread-safe is fishhook HOT 3
- Add support for installing via Swift Package Manager
- shimmed method doesn't get called from system libraries for iOS14 with arm64e device HOT 4
- iOS 14.5 crashed HOT 13
- iOS 15 crash HOT 8
- test
- Undefined symbol: _rebind_symbols in new commit 'aadc161ac3b80db07a9908851839a17ba63a9eb1' HOT 1
- Crashes with EXC_BAD_ACCESS on Apple Silicon mac when compiled as arm64e HOT 1
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