bpf: Compare iterator types during state pruning - #8649
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An iterator stack slot can be MEM_RCU or PTR_UNTRUSTED. These states must not be equal, or the verifier can prune an unsafe path. Compare the pointer type for STACK_ITER slots. Fixes: dfab99d ("bpf: teach the verifier to enforce css_iter and task_iter in RCU CS") Signed-off-by: Ning Ding <dingning04@gmail.com>
Add a path where RCU protection reaches zero and then starts again. The iterator is untrusted after this gap and must be rejected. Signed-off-by: Ning Ding <dingning04@gmail.com>
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Pull request for series with
subject: bpf: Compare iterator types during state pruning
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1141840