| From | Roland McGrath <> | Subject | Re: [PATCH -tip perf/probes 00/10] x86 insn decoder bugfixes | Date | Thu, 29 Oct 2009 12:18:01 -0700 (PDT) |
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> Thirdly, i think we should expose the build-id of the kernel and the > path to the vmlinux (and modules) via /proc/build-id or so. That way > tooling can find the vmlinux file and can validate that it matches the > kernel's signature. (maybe include a file date as well - that's a faster > check than a full build-id checksum, especially for large kernels)
You seem to be confused about what build IDs are. There is no "checksum validation". Once the bits are stored there is no calculation ever done again, only exact comparison with an expected build ID bitstring. The size of an object file is immaterial.
As Frank mentioned, the kernel's and modules' allocated ELF notes (and thus build IDs) are already exposed in /sys. Tools like "eu-unstrip -nk" use this information today.
Thanks, Roland
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