bpf: Restrict bpf_sys_bpf to CAP_PERFMON

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The verifier cannot perform sufficient validation of any pointers passed
into bpf_attr and treats them as integers rather than pointers. The helper
will then read from arbitrary pointers passed into it. Restrict the helper
to CAP_PERFMON since the security model in BPF of arbitrary kernel read is
CAP_BPF + CAP_PERFMON.

Fixes: af2ac3e13e ("bpf: Prepare bpf syscall to be used from kernel and user space.")
Signed-off-by: YiFei Zhu <zhuyifei@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220816205517.682470-1-zhuyifei@google.com

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YiFei Zhu 2022-08-16 20:55:16 +00:00 • committed by Daniel Borkmann

parent 3024d95a4c

commit 14b20b784f

1 changed files with 1 additions and 1 deletions

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kernel/bpf/syscall.c

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