upatch: dynamic user patching

用户态热补丁

1. 使用redis-6.2.5，make -j8 MALLOC=libc编译一个redis-server作为debug-info
2. 制作热补丁，upatch-build、upatch-diff、compiler-hijacker、as-hijacker在同一目录

sudo ./release/upatch-build 
-s ${redis根目录}
-i ${debug-info路径}
-b "make -j8 MALLOC=libc" 
-e ./src/redis-server
./test/redis/0001-Prevent-unauthenticated-client-from-easily-consuming.patch 

3. 启动redis-server

redis-server ./test/redis/resis.config

4. 测试

telnet 127.0.0.1 6380
*100

5. 使用upatch-manage打热补丁

upatch-manage patch -p ${运行的pid} -u ${热补丁} -b ${运行的redis-server二进制文件}

6. 测试

telnet 127.0.0.1 6380
*100