bpf: Make sure all tail call callers use cgroup storage if the owner does #6456
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…does Mitigate a possible NULL pointer dereference in bpf_get_local_storage() by requiring all callers to use cgroup storage if the owner does. Cgroup storage is allocated lazily when attaching a cgroup bpf program. With tail call, it is possible for a callee BPF program to see a NULL storage pointer if the caller prorgam does not use cgroup storage. Reported-by: Yinhao Hu <[email protected]> Reported-by: Kaiyan Mei <[email protected]> Reported-by: Dongliang Mu <[email protected]> Closes: https://lore.kernel.org/bpf/[email protected]/ Signed-off-by: Amery Hung <[email protected]>
Make sure that if the owner of a program array map uses cgroup storage, (1) all callers must use cgroup storage and (2) the cgroup storage map used by all callers and callees must be the owner's cgroup storage map. Signed-off-by: Amery Hung <[email protected]>
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Pull request for series with
subject: bpf: Make sure all tail call callers use cgroup storage if the owner does
version: 3
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1030226