CVE-2022-50862 in Linux
要約
〜によって VulDB • 2026年06月17日
Linux kernel BPF subsystem has a bug in `btf_func_proto_check` that causes a crash when a function prototype's return type is a `DECL_TAG` type. The issue arises because the code doesn't properly handle `DECL_TAG` types when checking function prototypes, leading to an invalid memory access.
The fix involves adding proper handling for `DECL_TAG` types in the `btf_func_proto_check` function. Specifically, the code should skip or properly handle `DECL_TAG` types when validating function prototypes, similar to how other special types are handled.
This bug was identified through analysis of the call trace showing the crash occurring in `btf_func_proto_check` during BTF parsing, and was confirmed by Martin's analysis in the referenced mailing list thread.
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