On Tue, 22 Aug 2023 00:19:55 +0900
Masami Hiramatsu (Google) [off-list ref] wrote:
quoted
I guess the question is, does CAP_PERFMON allow seeing where the kernel
mapped itself via some other means? If not, then no, I would nack this as
being a security hole.
As Song said, CAP_PERFMON allows user to put a kprobe anywhere user specified,
and it can run BPF program on it. This means it can access raw address
information via registers. if so, CAP_PERFMON allows seeing the kernel map or
equivalent information at this point.
I still don't like just giving it full kallsyms access.
I really do hate capabilities.
-- Steve