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README.md

      1 # forceredfine
      2 
      3 ForceRedefine is a JVMTI agent designed for testing how redefiniton affects running processes. It
      4 allows one to force classes to be redefined by writing to a fifo or give a process a list of
      5 classes to try redefining. Currently the redefinition is limited to adding (or removing) a single
      6 NOP at the beginning of every function in the class.
      7 
      8 # Usage
      9 ### Build
     10 >    `make libforceredefine`
     11 
     12 The libraries will be built for 32-bit, 64-bit, host and target. Below examples
     13 assume you want to use the 64-bit version.
     14 
     15 #### ART
     16 >    `adb shell setenforce 0`
     17 >
     18 >    `adb push $ANDROID_PRODUCT_OUT/system/lib64/libforceredefine.so /data/local/tmp/`
     19 >
     20 >    `echo java/util/ArrayList > /tmp/classlist`
     21 >    `echo java/util/Arrays >> /tmp/classlist`
     22 >    `adb push /tmp/classlist /data/local/tmp/`
     23 >
     24 >    `adb shell am attach-agent $(adb shell pidof some.deubggable.app) /data/local/tmp/libforceredefine.so=/data/local/tmp/classlist`
     25 
     26 Since the agent has no static state it can be attached multiple times to the same process.
     27 
     28 >    `adb shell am attach-agent $(adb shell pidof some.deubggable.app) /data/local/tmp/libforceredefine.so=/data/local/tmp/classlist`
     29 >    `adb shell am attach-agent $(adb shell pidof some.deubggable.app) /data/local/tmp/libforceredefine.so=/data/local/tmp/classlist2`
     30 >    `adb shell am attach-agent $(adb shell pidof some.deubggable.app) /data/local/tmp/libforceredefine.so=/data/local/tmp/classlist`
     31 
     32 One can also use fifos to send classes interactively to the process. (TODO: Have the agent
     33 continue reading from the fifo even after it gets an EOF.)