Re: [kernel-hardening] [RFC][PATCH 6/7] mm: Add Kconfig option for slab sanitization

Dave Hansen
2015-12-22T14:57:55Z

On 12/21/2015 07:40 PM, Laura Abbott wrote:
> + The tradeoff is performance impact. The noticible impact can vary
> + and you are advised to test this feature on your expected workload
> + before deploying it

What if instead of writing SLAB_MEMORY_SANITIZE_VALUE, we wrote 0's?
That still destroys the information, but it has the positive effect of
allowing a kzalloc() call to avoid zeroing the slab object. It might
mitigate some of the performance impact.

If this is on at compile time, but booted with sanitize_slab=off, is
there a performance impact?