ASan/LSan with a custom allocator

[Francis Ricci]

Hi all,

Is there currently a good way to run ASan/LSan on a program using a custom allocator (for example, tcmalloc)? I couldn't find any solutions in the current code other than manually adding some extra interceptors locally (in the tcmalloc case those would be things like tc_malloc and tc_free). I thought about trying to add some API functions to allow users to configure the allocation functions used by the sanitizers, but I don't think this will work since the interception is set up at link time + sanitizer library load time as far as I'm aware.

Has anyone put any thought into possible ways to handle this? I'd be willing to put in the work if anyone has any ideas on a potential solution.

Francis

[Kuba Mracek]

I think the usual solution is to have an option in the program to disable the custom allocator and use system malloc/free instead, and run ASan/LSan in this mode.  Far from ideal, but seems to work well in practice.  Does that not fit in your scenario?

Kuba

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