Viktor Malik 903fad4394 tools/resolve_btfids: Fix cross-compilation to non-host endianness ... The .BTF_ids section is pre-filled with zeroed BTF ID entries during the build and afterwards patched by resolve_btfids with correct values. Since resolve_btfids always writes in host-native endianness, it relies on libelf to do the translation when the target ELF is cross-compiled to a different endianness (this was introduced in commit 61e8aeda93 ("bpf: Fix libelf endian handling in resolv_btfids")). Unfortunately, the translation will corrupt the flags fields of SET8 entries because these were written during vmlinux compilation and are in the correct endianness already. This will lead to numerous selftests failures such as: $ sudo ./test_verifier 502 502 #502/p sleepable fentry accept FAIL Failed to load prog 'Invalid argument'! bpf_fentry_test1 is not sleepable verification time 34 usec stack depth 0 processed 0 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0 Summary: 0 PASSED, 0 SKIPPED, 1 FAILED Since it's not possible to instruct libelf to translate just certain values, let's manually bswap the flags (both global and entry flags) in resolve_btfids when needed, so that libelf then translates everything correctly. Fixes: ef2c6f370a ("tools/resolve_btfids: Add support for 8-byte BTF sets") Signed-off-by: Viktor Malik <vmalik@redhat.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/7b6bff690919555574ce0f13d2a5996cacf7bf69.1707223196.git.vmalik@redhat.com		2024-02-07 15:56:18 -08:00
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.gitignore	tools/resolve_btfids: Add /libsubcmd to .gitignore	2023-03-06 16:23:01 +01:00
Build	tools/resolve_btfids: Compile resolve_btfids as host program	2023-02-07 22:47:16 +01:00
main.c	tools/resolve_btfids: Fix cross-compilation to non-host endianness	2024-02-07 15:56:18 -08:00
Makefile	tools/resolve_btfids: Fix setting HOSTCFLAGS	2023-06-05 15:44:47 -07:00