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libbpf: Ensure new BTF objects inherit input endianness

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BugLink: https://bugs.launchpad.net/bugs/2097301

[ Upstream commit da18bfa59d403040d8bcba1284285916fe9e4425 ]

New split BTF needs to preserve base's endianness. Similarly, when
creating a distilled BTF, we need to preserve original endianness.

Fix by updating libbpf's btf__distill_base() and btf_new_empty() to retain
the byte order of any source BTF objects when creating new ones.

Fixes: ba451366bf ("libbpf: Implement basic split BTF support")
Fixes: 58e185a0dc35 ("libbpf: Add btf__distill_base() creating split BTF with distilled base BTF")
Reported-by: Song Liu <song@kernel.org>
Reported-by: Eduard Zingerman <eddyz87@gmail.com>
Suggested-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Tony Ambardar <tony.ambardar@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Alan Maguire <alan.maguire@oracle.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/6358db36c5f68b07873a0a5be2d062b1af5ea5f8.camel@gmail.com/
Link: https://lore.kernel.org/bpf/20240830095150.278881-1-tony.ambardar@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
This commit is contained in:
Tony Ambardar
2024-08-30 02:51:50 -07:00
committed by Mehmet Basaran
parent 62615d1983
commit 52deadbec3
1 changed files with 1 additions and 0 deletions
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tools/lib/bpf/btf.c
+1
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@@ -991,6 +991,7 @@ static struct btf *btf_new_empty(struct btf *base_btf)
btf->base_btf = base_btf;
btf->start_id = btf__type_cnt(base_btf);
btf->start_str_off = base_btf->hdr->str_len;
btf->swapped_endian = base_btf->swapped_endian;
}
/* +1 for empty string at offset 0 */