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brahma-adshonor / gohook

a funny library to hook golang function at runtime
https://www.cnblogs.com/catch/p/10973611.html
MIT License
513 stars 72 forks source link

The "Len" function in example.go cannot be hooked #46

Closed nabice closed 2 years ago

nabice commented 2 years ago

Go version: 1.18.1

As the result below shows, new sz is incorrect. go run example console output:

start testing...
foo1:23(miliao for foo1 before hook)
hook done
foo2:23(miliao for foo1 after hook)
foo1:100(not calling foo3)
r1:65, r2:4342
fake buffer WriteString func, s:hook by miliao
value of buff:abcd:hook by miliao
try hook bytes.Buffer.Len()
calling myBuffLen
calling myBuffLenTramp1
calling myBuffLenTramp2
calling myBuffLenTramp3
calling myBuffLenTramp4
old sz:19, new sz:19, copy func:19, recover:1233
fake buffer WriteString func, s:hook function at addr:4e3320, how:fix, num of instruction fixed:2

fake buffer WriteString func, s:==@004e3324    new inst:
fake buffer WriteString func, s:0f 
fake buffer WriteString func, s:86 
fake buffer WriteString func, s:9f 
fake buffer WriteString func, s:00 
fake buffer WriteString func, s:00 
fake buffer WriteString func, s:00 
fake buffer WriteString func, s:

fake buffer WriteString func, s:==@004e33ec    new inst:
fake buffer WriteString func, s:e9 
fake buffer WriteString func, s:2f 
fake buffer WriteString func, s:ff 
fake buffer WriteString func, s:ff 
fake buffer WriteString func, s:ff 
fake buffer WriteString func, s:

fake buffer WriteString func, s:hook function at addr:46c060, how:fix, num of instruction fixed:2

fake buffer WriteString func, s:==@0046c064    new inst:
fake buffer WriteString func, s:0f 
fake buffer WriteString func, s:86 
fake buffer WriteString func, s:dc 
fake buffer WriteString func, s:00 
fake buffer WriteString func, s:00 
fake buffer WriteString func, s:00 
fake buffer WriteString func, s:

fake buffer WriteString func, s:==@0046c169    new inst:
fake buffer WriteString func, s:e9 
fake buffer WriteString func, s:f2 
fake buffer WriteString func, s:fe 
fake buffer WriteString func, s:ff 
fake buffer WriteString func, s:ff 
fake buffer WriteString func, s:

debug info:
hook function at addr:4e3320, how:fix, num of instruction fixed:2
==@004e3324    new inst:0f 86 9f 00 00 00 
==@004e33ec    new inst:e9 2f ff ff ff 
hook function at addr:46c060, how:fix, num of instruction fixed:2
==@0046c064    new inst:0f 86 dc 00 00 00 
==@0046c169    new inst:e9 f2 fe ff ff
nabice commented 2 years ago

My bad. go build -gcflags=-l