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  - 已解決 Linux 核心中的下列弱點：bpf: Reject struct_ops registration that uses module ptr and the module btf_id is missing There is a UAF report in the bpf_struct_ops when CONFIG_MODULES=n. In particular, the report is on tcp_congestion_ops that has a struct module *owner member. For struct_ops that has a struct module *owner member, it can be extended either by the regular kernel module or by the bpf_struct_ops. bpf_try_module_get() will be used to do the refcounting and different refcount is done based on the owner pointer. When CONFIG_MODULES=n, the btf_id of the struct module is missing: WARN: resolve_btfids: unresolved symbol module Thus, the bpf_try_module_get() cannot do the correct refcounting. Not all subsystem's struct_ops requires the struct module *owner member.
    e.g. the recent sched_ext_ops. This patch is to disable bpf_struct_ops registration if the struct_ops has the struct module * member and the struct module btf_id is missing. The btf_type_is_fwd() helper is moved to the btf.h header file for this test. This has happened since the beginning of bpf_struct_ops which has gone through many changes. The Fixes tag is set to a recent commit that this patch can apply cleanly. Considering CONFIG_MODULES=n is not common and the age of the issue, targeting for bpf-next also.
    (CVE-2024-58060)

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偵測

Linux Distros 未修補的弱點：CVE-2024-58060

high Nessus Plugin ID 232233

版本 1.6