bpf: Nested rcu critical sections #10315
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Currently, nested rcu critical sections are rejected by the verifier and rcu_lock state is managed by a boolean variable. Add support for nested rcu critical sections by make active_rcu_locks a counter similar to active_preempt_locks. bpf_rcu_read_lock() increments this counter and bpf_rcu_read_unlock() decrements it, MEM_RCU -> PTR_UNTRUSTED transition happens when active_rcu_locks drops to 0. Signed-off-by: Puranjay Mohan <[email protected]>
As verifier now supports nested rcu critical sections, add new test cases to make sure unbalanced usage of rcu_read_lock()/unlock() is rejected. Signed-off-by: Puranjay Mohan <[email protected]>
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Pull request for series with
subject: bpf: Nested rcu critical sections
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1024478