bpf: Check cfi_stubs before registering a struct_ops type.

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Recently, st_ops->cfi_stubs was introduced. However, the upcoming new
struct_ops support (e.g. sched_ext) is not aware of this and does not
provide its own cfi_stubs. The kernel ends up NULL dereferencing the
st_ops->cfi_stubs.

Considering struct_ops supports kernel module now, this NULL check
is necessary. This patch is to reject struct_ops registration
that does not provide a cfi_stubs.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Link: https://lore.kernel.org/r/20240222021105.1180475-2-thinker.li@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

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Kui-Feng Lee 2024-02-21 18:11:04 -08:00 • committed by Martin KaFai Lau

parent 58fd62e0aa

commit 3e0008336a

1 changed files with 5 additions and 0 deletions

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kernel/bpf/bpf_struct_ops.c

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