bpf: require an owned cpumask for bpf_cpumask_populate()#12759
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bpf: require an owned cpumask for bpf_cpumask_populate()#12759kernel-patches-daemon-bpf[bot] wants to merge 3 commits into
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bpf_cpumask_populate() writes to its destination with bitmap_copy(), but the destination is typed as struct cpumask *. That allows the verifier to accept borrowed cpumask pointers returned by read-only kfuncs, such as scx_bpf_get_online_cpumask(), as a writable destination. Make the destination a struct bpf_cpumask * so populate follows the same ownership rule as the other mutating cpumask kfuncs. Query kfuncs continue to accept const struct cpumask * inputs. Fixes: 950ad93 ("bpf: add kfunc for populating cpumask bits") Signed-off-by: Nicholas Dudar <main.kalliope@gmail.com> Assisted-by: Claude:claude-opus-4-8 Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
bpf_cpumask_populate() now takes a struct bpf_cpumask *, so update the kfunc declaration and drop the struct cpumask * casts in the existing populate tests. Add test_populate_borrowed_destination, which passes a borrowed task->cpus_ptr and asserts the verifier rejects it as a writable destination. Signed-off-by: Nicholas Dudar <main.kalliope@gmail.com> Assisted-by: Claude:claude-opus-4-8
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=1124896 irrelevant now. Closing PR. |
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Pull request for series with
subject: bpf: require an owned cpumask for bpf_cpumask_populate()
version: 3
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1124896