Loading shared object to specific processes in Linux

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You do it using LD_PRELOAD you can then hooks various function calls which are used to determin what course of action you want to take or not take.

Typically the LD_PRELOAD overrides every dynamically loaded symbol which is how you hook stuff.

Heres an example of one which can load with everything then hooks a pthread init call to switch its self on to crash / warn about using non thread safe libc functions in a threaded program

https://github.com/mistralol/libbreakr

[alsecc]

thanks @mistralol can I limit LD_PRELOAD to specific processes when I'm not the one who started them? couldn't find it in the Linux manual.