Re: [PATCH v3 bpf-next 13/18] bpf: Fix race in btf_resolve_helper_id()
From: Song Liu <hidden>
Date: 2019-11-08 07:33:27
Also in:
bpf
On Nov 7, 2019, at 10:40 PM, Alexei Starovoitov [off-list ref] wrote:
btf_resolve_helper_id() caching logic is a bit racy, since under root the
verifier can verify several programs in parallel. Fix it with READ/WRITE_ONCE.
Fix the type as well, since error is also recorded.
Fixes: a7658e1a4164 ("bpf: Check types of arguments passed into helpers")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>Acked-by: Song Liu <redacted>