bpf: Undo strict enforcement for walking untagged fields.

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The commit 6fcd486b3a ("bpf: Refactor RCU enforcement in the verifier.")
broke several tracing bpf programs. Even in clang compiled kernels there are
many fields that are not marked with __rcu that are safe to read and pass into
helpers, but the verifier doesn't know that they're safe. Aggressively marking
them as PTR_UNTRUSTED was premature.

Fixes: 6fcd486b3a ("bpf: Refactor RCU enforcement in the verifier.")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/bpf/20230404045029.82870-8-alexei.starovoitov@gmail.com

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Alexei Starovoitov 2023-04-03 21:50:28 -07:00 • committed by Andrii Nakryiko

parent 30ee9821f9

commit afeebf9f57

1 changed files with 8 additions and 3 deletions

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kernel/bpf/verifier.c

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