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CONFIG_SLUB_RCU_DEBUG: Enable UAF detection in TYPESAFE_BY_RCU caches (for KASAN)

General informations

The Linux kernel configuration item CONFIG_SLUB_RCU_DEBUG:

Help text

Make SLAB_TYPESAFE_BY_RCU caches behave approximately as if the cache was not marked as SLAB_TYPESAFE_BY_RCU and every caller used kfree_rcu() instead.

This is intended for use in combination with KASAN, to enable KASAN to detect use-after-free accesses in such caches. (KFENCE is able to do that independent of this flag.)

This might degrade performance. Unfortunately this also prevents a very specific bug pattern from triggering (insufficient checks against an object being recycled within the RCU grace period); so this option can be turned off even on KASAN builds, in case you want to test for such a bug.

If you're using this for testing bugs / fuzzing and care about catching all the bugs WAY more than performance, you might want to also turn on RCU_STRICT_GRACE_PERIOD.

WARNING: This is designed as a debugging feature, not a security feature. Objects are sometimes recycled without RCU delay under memory pressure.

If unsure, say N.

Hardware

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