Hello:
This patch was applied to bpf/bpf.git (refs/heads/master):
On Thu, 17 Jun 2021 23:14:04 -0700 you wrote:
The vmlinux ".BTF_ids" ELF section is declared in btf_ids.h to hold a list of zero-filled BTF IDs, which is then patched at link-time with correct values by resolv_btfids. The section is flagged as "allocable" to preclude compression, but notably the section contents (BTF IDs) are untyped.
When patching the BTF IDs, resolve_btfids writes in host-native endianness and relies on libelf for any required translation on reading and updating vmlinux. However, since the type of the .BTF_ids section content defaults to ELF_T_BYTE (i.e. unsigned char), no translation occurs. This results in incorrect patched values when cross-compiling to non-native endianness, and can manifest as kernel Oops and test failures which are difficult to troubleshoot [1].
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Here is the summary with links: - [bpf,v2] bpf: fix libelf endian handling in resolv_btfids https://git.kernel.org/bpf/bpf/c/61e8aeda9398
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